10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D. C. 20549

FORM 10-Q

(Mark One)

☒ Quarterly Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

For the quarterly period ended September 30, 2023

☐ Transition Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

For the transition period from to

Commission file number 001-11294

Unum Group

(Exact name of registrant as specified in its charter)

Delaware	62-1598430
(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification No.)
1 Fountain Square Chattanooga, Tennessee	37402
(Address of principal executive offices)	(Zip Code)
(423) 294-1011
(Registrant's telephone number, including area code)
Not Applicable
(Former name, former address and former fiscal year, if changed since last report)

Securities registered pursuant to Section 12(b) of the Act:

Title of each class	Trading Symbol(s)	Name of each exchange on which registered
Common stock, $0.10 par value	UNM	New York Stock Exchange
6.250% Junior Subordinated Notes due 2058	UNMA	New York Stock Exchange

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. Yes [X] No [ ]

Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit such files). Yes [X] No [ ]

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and "emerging growth company" in Rule 12b-2 of the Exchange Act.

(Check one):

Large Accelerated Filer	x	Accelerated filer	☐
Non-accelerated filer	¨	Smaller reporting company	☐
		Emerging growth company	☐
If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.			☐

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Act). Yes ☐ No ☒

195,045,646 shares of the registrant's common stock were outstanding as of October 30, 2023.

 TABLE OF CONTENTS

		Page
	Cautionary Statement Regarding Forward-Looking Statements	1
	PART I - FINANCIAL INFORMATION
Item 1.	Financial Statements (Unaudited):	3
	Consolidated Balance Sheets at September 30, 2023 and December 31, 2022	3
	Consolidated Statements of Income for the three and nine months ended September 30, 2023 and 2022	5
	Consolidated Statements of Comprehensive Income for the three and nine months ended September 30, 2023 and 2022	6
	Consolidated Statements of Stockholders' Equity for the three and nine months ended September 30, 2023 and 2022	7
	Consolidated Statements of Cash Flows for the nine months ended September 30, 2023 and 2022	8
	Notes to Consolidated Financial Statements	9
	Note 1 - Basis of Presentation	9
	Note 2 - Accounting Developments	9
	Note 3 - Fair Values of Financial Instruments	18
	Note 4 - Investments	36
	Note 5 - Derivative Financial Instruments	51
	Note 6 - Accumulated Other Comprehensive Loss	60
	Note 7 - Liability for Future Policy Benefits	62
	Note 8 - Policyholders' Account Balances	80
	Note 9 - Deferred Acquisition Costs	83
	Note 10 - Segment Information	86
	Note 11 - Employee Benefit Plans	90
	Note 12 - Stockholders' Equity and Earnings Per Common Share	91
	Note 13 - Commitments and Contingent Liabilities	92
	Note 14 - Other	94
Item 2.	Management's Discussion and Analysis of Financial Condition and Results of Operations	95
Item 3.	Quantitative and Qualitative Disclosures About Market Risk	146
Item 4.	Controls and Procedures	146
	PART II - OTHER INFORMATION
Item 1.	Legal Proceedings	147
Item 1A.	Risk Factors	147
Item 2.	Unregistered Sales of Equity Securities and Use of Proceeds	147
Item 5.	Other Information	147
Item 6.	Exhibits	148
	Signatures	149

Cautionary Statement Regarding Forward-Looking Statements

The Private Securities Litigation Reform Act of 1995 (the Act) provides a "safe harbor" to encourage companies to provide prospective information, as long as those statements are identified as forward-looking and are accompanied by meaningful cautionary statements identifying important factors that could cause actual results to differ materially from those included in the forward-looking statements. Certain information contained in this quarterly report on Form 10-Q (including certain statements in the consolidated financial statements and related notes and Management's Discussion and Analysis), or in any other written or oral statements made by us in communications with the financial community or contained in documents filed with the Securities and Exchange Commission (SEC), may be considered forward-looking statements within the meaning of the Act. Forward-looking statements are those not based on historical information, but rather relate to our outlook, future operations, strategies, financial results, or other developments. Forward-looking statements speak only as of the date made. We undertake no obligation to update these statements, even if made available on our website or otherwise. These statements may be made directly in this document or may be made part of this document by reference to other documents filed by us with the SEC, a practice which is known as "incorporation by reference." You can find many of these statements by looking for words such as "will," "may," "should," "could," "believes," "expects," "anticipates," "estimates," "plans," "assumes," "intends," "projects," "goals,” "objectives," or similar expressions in this document or in documents incorporated herein.

1

Cautionary Statement Regarding Forward-Looking Statements - Continued

These forward-looking statements are subject to numerous assumptions, risks, and uncertainties, many of which are beyond our control. We caution readers that the following factors, in addition to other factors mentioned from time to time, may cause actual results to differ materially from those contemplated by the forward-looking statements:

•Fluctuation in insurance reserve liabilities and claim payments due to changes in claim incidence, recovery rates, mortality and morbidity rates, and policy benefit offsets due to, among other factors, the rate of unemployment and consumer confidence, the emergence of new diseases, epidemics, or pandemics, new trends and developments in medical treatments, the effectiveness of our claims operational processes, and changes in governmental programs.

•Sustained periods of low interest rates.

•Unfavorable economic or business conditions, both domestic and foreign, that may result in decreases in sales, premiums, or persistency, as well as unfavorable claims activity or unfavorable returns on our investment portfolio.

•The impact of pandemics and other public health issues, including COVID-19, on our business, financial position, results of operations, liquidity and capital resources, and overall business operations.

•Changes in, or interpretations or enforcement of, laws and regulations.

•Our ability to hire and retain qualified employees.

•A cyber attack or other security breach resulting in the unauthorized acquisition of confidential data.

•The failure of our business recovery and incident management processes to resume our business operations in the event of a natural catastrophe, cyber attack, or other event.

•Investment results, including, but not limited to, changes in interest rates, defaults, changes in credit spreads, impairments, and the lack of appropriate investments in the market which can be acquired to match our liabilities.

•Increased competition from other insurers and financial services companies due to industry consolidation, new entrants to our markets, or other factors.

•Changes in our financial strength and credit ratings.

•Our ability to develop digital capabilities or execute on our technology systems upgrades or replacements.

•Actual experience in the broad array of our products that deviates from our assumptions used in pricing, underwriting, and reserving.

•Ineffectiveness of our derivatives hedging programs due to changes in forecasted cash flows, the economic environment, counterparty risk, ratings downgrades, capital market volatility, changes in interest rates, and/or regulation.

•Availability of reinsurance in the market and the ability of our reinsurers to meet their obligations to us.

•Ability to generate sufficient internal liquidity and/or obtain external financing.

•Damage to our reputation due to, among other factors, regulatory investigations, legal proceedings, external events, and/or inadequate or failed internal controls and procedures.

•Disruptions to our business or our ability to leverage data caused by the use and reliance on third party vendors, including vendors providing web and cloud based applications.

•Recoverability and/or realization of the carrying value of our intangible assets, long-lived assets, and deferred tax assets.

•Effectiveness of our risk management program.

•Contingencies and the level and results of litigation.

•Fluctuation in foreign currency exchange rates.

•Our ability to meet environment, social, and governance standards and expectations of investors, regulators, customers, and other stakeholders.

For further discussion of risks and uncertainties which could cause actual results to differ from those contained in the forward-looking statements, see Part 1, Item 1A of our annual report on Form 10-K for the year ended December 31, 2022.

All subsequent written and oral forward-looking statements attributable to us or any person acting on our behalf are expressly qualified in their entirety by the cautionary statements contained or referred to in this section.

2

Table of Contents

PART I - FINANCIAL INFORMATION

ITEM 1. FINANCIAL STATEMENTS

CONSOLIDATED BALANCE SHEETS (UNAUDITED)

Unum Group and Subsidiaries

 

	September 30		December 31
	2023		2022
	(in millions of dollars)
			As Adjusted
Assets
Investments
Fixed Maturity Securities - at fair value (amortized cost of $38,224.3; $37,825.2; allowance for credit losses of $—; $—)	$	34,070.7	$	34,840.8
Mortgage Loans (net of allowance for credit losses of $10.2; $9.3)	2,321.5		2,435.4
Policy Loans	3,596.6		3,601.2
Other Long-term Investments	1,506.9		1,440.1
Short-term Investments	1,487.2		1,394.8
Total Investments	42,982.9		43,712.3
Other Assets
Cash and Bank Deposits	165.9		119.2
Accounts and Premiums Receivable (net of allowance for credit losses of $29.7; $32.5)	1,507.7		1,482.1
Reinsurance Recoverable (net of allowance for credit losses of $1.8; $1.7)	8,855.2		9,608.0
Accrued Investment Income	704.9		615.0
Deferred Acquisition Costs	2,668.7		2,560.0
Goodwill	347.9		347.6
Property and Equipment	463.3		451.7
Deferred Income Tax	617.1		586.0
Other Assets	1,640.9		1,666.6
Total Assets	$	59,954.5	$	61,148.5

 See notes to consolidated financial statements.

3

Table of Contents

CONSOLIDATED BALANCE SHEETS (UNAUDITED) - Continued

Unum Group and Subsidiaries

	September 30		December 31
	2023		2022
	(in millions of dollars)
			As Adjusted
Liabilities and Stockholders' Equity
Liabilities
Future Policy Benefits	$	36,502.4	$	38,577.1
Policyholders' Account Balances	5,744.5		5,740.2
Unearned Premiums	447.2		365.5
Other Policyholders’ Funds	1,631.9		1,750.4
Income Tax Payable	267.2		190.9
Deferred Income Tax	27.1		25.2
Short-term Debt	2.0		2.0
Long-term Debt	3,429.8		3,427.8
Other Liabilities	2,284.3		2,334.4
Total Liabilities	50,336.4		52,413.5
Commitments and Contingent Liabilities - Note 13
Stockholders' Equity
Common Stock, $0.10 par
Authorized: 725,000,000 shares
Issued: 309,486,850 and 308,306,490 shares	30.9		30.8
Additional Paid-in Capital	2,454.3		2,441.0
Accumulated Other Comprehensive Loss	(3,150.6)		(3,448.3)
Retained Earnings	13,888.7		13,141.3
Treasury Stock - at cost: 114,469,894 and 110,551,977 shares	(3,605.2)		(3,429.8)
Total Stockholders' Equity	9,618.1		8,735.0
Total Liabilities and Stockholders' Equity	$	59,954.5	$	61,148.5

See notes to consolidated financial statements.

4

CONSOLIDATED STATEMENTS OF INCOME (UNAUDITED)

Unum Group and Subsidiaries

 

	Three Months Ended September 30				Nine Months Ended September 30
	2023		2022		2023		2022
	(in millions of dollars, except share data)
			As Adjusted				As Adjusted
Revenue
Premium Income	$	2,525.9	$	2,388.9	$	7,494.3	$	7,206.3
Net Investment Income	526.0		511.6		1,565.9		1,597.8
Net Investment Loss	(31.0)		(4.4)		(30.0)		(22.3)
Other Income	71.6		63.0		210.6		197.5
Total Revenue	3,092.5		2,959.1		9,240.8		8,979.3
Benefits and Expenses
Policy Benefits	1,778.6		1,843.2		5,498.6		5,691.9
Policy Benefits - Remeasurement Loss (Gain)	168.4		(341.7)		(61.6)		(476.1)
Commissions	289.7		271.5		869.7		819.1
Interest and Debt Expense	48.6		47.0		145.6		141.3
Cost Related to Early Retirement of Debt	—		4.2		—		4.2
Deferral of Acquisition Costs	(153.3)		(139.4)		(467.5)		(419.1)
Amortization of Deferred Acquisition Costs	129.1		102.9		358.7		313.0
Compensation Expense	297.9		285.9		867.3		794.1
Other Expenses	271.8		243.9		818.6		734.4
Total Benefits and Expenses	2,830.8		2,317.5		8,029.4		7,602.8
Income Before Income Tax	261.7		641.6		1,211.4		1,376.5
Income Tax Expense (Benefit)
Current	187.5		156.9		381.7		383.8
Deferred	(127.8)		(25.6)		(123.5)		(125.3)
Total Income Tax Expense	59.7		131.3		258.2		258.5
Net Income	$	202.0	$	510.3	$	953.2	$	1,118.0
Net Income Per Common Share
Basic	$	1.03	$	2.55	$	4.83	$	5.55
Assuming Dilution	$	1.02	$	2.53	$	4.81	$	5.52

See notes to consolidated financial statements.

5

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED)

Unum Group and Subsidiaries

 

	Three Months Ended September 30				Nine Months Ended September 30
	2023		2022		2023		2022
	(in millions of dollars)
			As Adjusted				As Adjusted
Net Income	$	202.0	$	510.3	$	953.2	$	1,118.0
Other Comprehensive Income
Change in Net Unrealized Loss on Securities (net of tax benefit of $313.8; $520.8; $249.2; $2,017.2)	(1,185.8)		(1,925.9)		(920.0)		(7,500.7)
Change in the Effect of Discount Rate Assumptions on the Liability for Future Policy Benefits, Net of Reinsurance (net of tax expense of $445.0; $599.4; $368.2; $2,485.7)	1,688.4		2,222.9		1,374.6		9,252.4
Change in Net Loss on Hedges (net of tax benefit of $38.9; $8.1; $44.7; $12.6)	(144.4)		(32.9)		(168.1)		(48.3)
Change in Foreign Currency Translation Adjustment (net of tax expense (benefit) of $(0.7); $5.4; $0.3; $11.5)	(55.1)		(71.5)		7.9		(164.9)
Change in Unrecognized Pension and Postretirement Benefit Costs (net of tax expense of $1.2; $1.1; $1.1; $4.0)	3.9		5.9		3.3		15.1
Total Other Comprehensive Income	307.0		198.5		297.7		1,553.6
Comprehensive Income	$	509.0	$	708.8	$	1,250.9	$	2,671.6

See notes to consolidated financial statements.

6

CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (UNAUDITED)

Unum Group and Subsidiaries

     

	Three Months Ended September 30				Nine Months Ended September 30
	2023		2022		2023		2022
	(in millions of dollars)
			As Adjusted				As Adjusted
Common Stock
Balance at Beginning of Period	$	30.9	$	30.8	$	30.8	$	30.7
Common Stock Activity	—		—		0.1		0.1
Balance at End of Period	30.9		30.8		30.9		30.8
Additional Paid-in Capital
Balance at Beginning of Period	2,444.9		2,417.4		2,441.0		2,408.1
Common Stock Activity	9.4		14.9		13.3		24.2
Balance at End of Period	2,454.3		2,432.3		2,454.3		2,432.3
Accumulated Other Comprehensive Loss
Balance at Beginning of Period, as Adjusted	(3,457.6)		(3,809.5)		(3,448.3)		(5,164.6)
Other Comprehensive Income	307.0		198.5		297.7		1,553.6
Balance at End of Period	(3,150.6)		(3,611.0)		(3,150.6)		(3,611.0)
Retained Earnings
Balance at Beginning of Period, as Adjusted	13,758.1		12,473.7		13,141.3		11,989.4
Net Income	202.0		510.3		953.2		1,118.0
Dividends to Stockholders (per common share: $0.365; $0.330; $1.025; $0.930)	(71.4)		(66.1)		(205.8)		(189.5)
Balance at End of Period	13,888.7		12,917.9		13,888.7		12,917.9
Treasury Stock
Balance at Beginning of Period	(3,530.4)		(3,324.6)		(3,429.8)		(3,229.7)
Repurchases of Treasury Stock	(74.8)		(42.6)		(175.4)		(137.5)
Balance at End of Period	(3,605.2)		(3,367.2)		(3,605.2)		(3,367.2)
Total Stockholders' Equity at End of Period	$	9,618.1	$	8,402.8	$	9,618.1	$	8,402.8

See notes to consolidated financial statements.

7

CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED)

Unum Group and Subsidiaries

 

	Nine Months Ended September 30
	2023		2022
	(in millions of dollars)
			As Adjusted
Cash Flows from Operating Activities
Net Income	$	953.2	$	1,118.0
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities
Change in Receivables	455.9		457.9
Change in Deferred Acquisition Costs	(108.8)		(106.1)
Change in Insurance Liabilities	(169.3)		(112.6)
Change in Income Taxes	(26.9)		7.3
Change in Other Accrued Liabilities	(150.2)		(135.0)
Non-cash Components of Net Investment Income	(262.9)		(293.0)
Net Investment Loss	30.0		22.3
Depreciation	80.9		83.5
Amortization of the Cost of Reinsurance	33.1		38.5
Other, Net	24.3		(19.0)
Net Cash Provided by Operating Activities	859.3		1,061.8
Cash Flows from Investing Activities
Proceeds from Sales of Fixed Maturity Securities	1,013.5		453.4
Proceeds from Maturities of Fixed Maturity Securities	1,113.9		1,125.6
Proceeds from Sales and Maturities of Other Investments	275.2		306.4
Purchases of Fixed Maturity Securities	(2,439.4)		(2,380.5)
Purchases of Other Investments	(227.1)		(342.7)
Net Maturities and Sales (Purchases) of Short-term Investments	(45.2)		204.9
Net Increase (Decrease) in Payables for Collateral on Investments	(100.4)		12.5
Net Purchases of Property and Equipment	(89.1)		(70.8)
Net Cash Used by Investing Activities	(498.6)		(691.2)
Cash Flows from Financing Activities
Issuance of Long-term Debt	—		349.2
Long-term Debt Repayment	—		(364.0)
Cost Related to Early Retirement of Debt	—		(3.6)
Issuance of Common Stock	4.1		2.7
Repurchase of Common Stock	(174.2)		(136.1)
Dividends Paid to Stockholders	(205.7)		(188.4)
Proceeds from Policyholders' Account Deposits	109.3		90.9
Payments for Policyholders' Account Withdrawals	(65.2)		(55.6)
Cash Received Related to Active Life Volatility Cover Agreement	18.6		5.2
Other, Net	(0.9)		(2.6)
Net Cash Used by Financing Activities	(314.0)		(302.3)
Net Increase in Cash and Bank Deposits	46.7		68.3
Cash and Bank Deposits at Beginning of Year	119.2		75.0
Cash and Bank Deposits at End of Period	$	165.9	$	143.3

See notes to consolidated financial statements.

8

Table of Contents

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED)    

Unum Group and Subsidiaries

September 30, 2023

Note 1 - Basis of Presentation

The accompanying consolidated financial statements of Unum Group and its subsidiaries (the Company) have been prepared in accordance with U.S. generally accepted accounting principles (GAAP) for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by GAAP for complete financial statements. For further information, refer to the consolidated financial statements and footnotes included in our annual report on Form 10-K for the year ended December 31, 2022.

In our opinion, all adjustments (consisting of normal recurring accruals) considered necessary for a fair presentation have been included. Interim results are not necessarily indicative of full year performance.

Note 2 - Accounting Developments

Accounting Standards Updates (ASUs) Adopted in 2023:

ASU 2022-02, Financial Instruments - Credit Losses (Topic 326): Troubled Debt Restructurings and Vintage Disclosures

The amendments in this update eliminated the troubled debt restructuring recognition and measurement guidance and instead required that an entity evaluate whether the modification represents a new loan or the continuation of an existing loan. The amendments also enhanced the disclosure requirements related to certain modifications of receivables made to borrowers experiencing financial difficulty. In addition, the amendments in this update required that an entity disclose current-period gross write-offs by year of origination for financing receivables and net investment in leases. The amendments in this update were applied prospectively in the period of adoption as of January 1, 2023. The adoption of this update modified our disclosures but did not have an impact on our financial position or results of operations.

ASU 2018-12, Financial Services—Insurance (Topic 944): Targeted Improvements to the Accounting for Long-Duration Contracts and related amendments

This update significantly amended the accounting and disclosure requirements for long-duration insurance contracts. These changes included a requirement to review, and if necessary, update cash flow assumptions used to measure the liability for future policy benefits for traditional and limited-payment contracts at least annually, with changes recognized in earnings. In addition, an entity is required to update the discount rate assumption at each reporting date using a yield that is reflective of an upper-medium grade fixed-income instrument, with changes recognized in other comprehensive income (loss) (OCI). These changes resulted in the elimination of the provision for risk of adverse deviation and premium deficiency (or loss recognition) testing for traditional long-duration insurance contracts. The update also required that an entity measure all market risk benefits associated with deposit contracts at fair value, with changes recognized in earnings except for the portion attributable to a change in the instrument-specific credit risk, which is to be recognized in OCI. This update also simplified the amortization of deferred acquisition costs by requiring amortization on a constant level basis over the expected term of the related contracts. Deferred acquisition costs are required to be written off for unexpected contract terminations, but are no longer subject to an impairment test. Significant additional disclosures are required, which include disaggregated rollforwards of certain liability balances and the disclosure of qualitative and quantitative information about expected cash flows, estimates, and assumptions. We do not have products with market risk benefits. The update was effective for periods beginning January 1, 2023.

We adopted this guidance effective January 1, 2023 using the modified retrospective approach with changes applied as of January 1, 2021, also referred to as the transition date. The following tables summarize the impacts of the adoption of ASU 2018-12 on the liability for future policy benefits, deferred acquisition costs, and stockholders' equity as of the transition date as well as impacted historical condensed consolidated financial statement line items for historical comparison.

All historically reported information included throughout these financial statements has been adjusted for the impacts of our modified retrospective adoption of ASU 2018-12.

9

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2023

Note 2 - Accounting Developments - Continued

Impact of the Adoption of ASU 2018-12 as of the Transition Date:

Stockholders' Equity

The following table summarizes the changes in stockholders' equity due to the adoption of ASU 2018-12 and the resulting adjusted balances at January 1, 2021:

	Consolidated
	Retained Earnings		Accumulated Other Comprehensive Income (Loss)		Total Stockholders' Equity
	(in millions of dollars)
Balance at December 31, 2020	$	11,269.6	$	374.2	$	10,871.0
Impact of the Adoption of ASU 2018-12	(20.6)		(6,684.4)		(6,705.0)
Balance at January 1, 2021	$	11,249.0	$	(6,310.2)	$	4,166.0

10

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2023

Note 2 - Accounting Developments - Continued

Liability for Future Policy Benefits

The following tables summarize the changes in the liability for future policy benefits due to the adoption of ASU 2018-12 and the resulting adjusted balance at January 1, 2021. The removal of shadow adjustments and effect of change in discount rate assumptions are both recorded as transition adjustments to accumulated other comprehensive income (loss) (AOCI) while the adjustments for loss contracts are recorded as a transition adjustment to retained earnings.

	Unum US		Unum International		Colonial Life		Closed Block		Consolidated
	(in millions of dollars)
Balance at December 31, 20201	$	12,184.6	$	2,969.8	$	1,977.2	$	28,572.8	$	45,704.4
Removal of Shadow Adjustments2	(1,569.7)		(545.8)		(44.5)		(4,065.6)		(6,225.6)
Adjustments for Loss Contracts3	—		—		34.9		—		34.9
Effect of Change in Discount Rate Assumptions	2,251.8		779.4		568.6		12,484.8		16,084.6
Other4	(5.3)		—		(7.6)		—		(12.9)
Balance at January 1, 2021	12,861.4		3,203.4		2,528.6		36,992.0		55,585.4
Reinsurance Recoverable5	357.7		132.5		4.4		10,001.4		10,496.0
Balance, Net of Reinsurance, at January 1, 2021	$	12,503.7	$	3,070.9	$	2,524.2	$	26,990.6	$	45,089.4
1We previously reported policy and contract benefits and reserves for future policy and contract benefits liabilities in our consolidated balance sheet as of December 31, 2020 of $1,855.4 million and $49,653.0 million, respectively, resulting in total policyholder liabilities of $51,508.4 million. These balances were reclassified into new line items, future policy benefits and policyholders' account balances, which would have reported balances of $45,704.4 million and $5,804.0 million as of December 31, 2020, respectively, resulting in total policyholder liabilities of $51,508.4 million under the historical accounting method. These balances were reclassified to more closely align with the new disclosure requirements of ASU 2018-12.
2Shadow adjustments represent the adjustments related to unrealized investment gains and losses previously included in the reserves balance prior to the adoption of ASU 2018-12.
3Adjustment for loss contracts represents the adjustment for those cohorts whose net premium ratio exceeded 100 percent as of the transition date. For those cohorts, the net premiums were set equal to the gross premiums and the difference was recorded as a transition adjustment to the liability for future policy benefits.
4This amount reflects the effect of the reclassification of certain unearned premium. This amount was reclassified to more closely align with the presentation of liabilities under ASU 2018-12 and had no impact to stockholders' equity.
5These amounts represent the portion of reinsurance recoverable related to the liability for future policy benefits. These amounts include the adjustments for the removal of shadow adjustments and for the effect of change in discount rate assumptions for the liability for future policy benefits ceded to third party reinsurers.

11

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2023

Note 2 - Accounting Developments - Continued

	Unum US Segment
	Group Disability		Group Life and AD&D		Individual Disability		Voluntary Benefits		Dental and Vision		Total
	(in millions of dollars)
Balance at December 31, 2020	$	7,409.0	$	1,123.9	$	2,485.3	$	1,154.9	$	11.5	$	12,184.6
Removal of Shadow Adjustments	(1,025.2)		(88.5)		(446.1)		(9.9)		—		(1,569.7)
Effect of Change in Discount Rate Assumptions	911.9		91.9		728.5		519.5		—		2,251.8
Other	—		—		—		(5.3)		—		(5.3)
Balance at January 1, 2021	7,295.7		1,127.3		2,767.7		1,659.2		11.5		12,861.4
Reinsurance Recoverable	58.3		3.0		260.6		35.7		0.1		357.7
Balance, Net of Reinsurance, at January 1, 2021	$	7,237.4	$	1,124.3	$	2,507.1	$	1,623.5	$	11.4	$	12,503.7

	Closed Block Segment
	Long-term Care		All Other		Total
	(in millions of dollars)
Balance at December 31, 2020	$	16,283.4	$	12,289.4	$	28,572.8
Removal of Shadow Adjustments	(3,465.4)		(600.2)		(4,065.6)
Effect of Change in Discount Rate Assumptions	9,922.9		2,561.9		12,484.8
Balance at January 1, 2021	22,740.9		14,251.1		36,992.0
Reinsurance Recoverable	44.4		9,957.0		10,001.4
Balance, Net of Reinsurance, at January 1, 2021	$	22,696.5	$	4,294.1	$	26,990.6

Deferred Acquisition Costs (DAC)

The following tables summarize the changes in DAC due to the adoption of ASU 2018-12 and the resulting adjusted balance at January 1, 2021. The removal of shadow adjustments is recorded as a transition adjustment to AOCI.

	Unum US1		Unum International		Colonial Life		Consolidated
	(in millions of dollars)
Balance at December 31, 2020	$	1,168.7	$	32.0	$	1,071.9	$	2,272.6
Removal of Shadow Adjustments	12.3		—		72.8		85.1
Balance at January 1, 2021	$	1,181.0	$	32.0	$	1,144.7	$	2,357.7
1The $12.3 million removal of shadow adjustments is related to the Unum US voluntary benefits product line.

12

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2023

Note 2 - Accounting Developments - Continued

Impact of the Adoption of ASU 2018-12 on Historical Financial Statements:

The following tables present the effect of the adoption of ASU 2018-12 on our historical consolidated financial statements:

	September 30, 2022
	Historical Accounting Method		As Adjusted		Effect of Change
	(in millions of dollars)
Consolidated Balance Sheets
Assets
Reinsurance Recoverable	$	10,289.7	$	9,574.1	$	(715.6)
Deferred Acquisition Costs	2,254.6		2,526.5		271.9
Deferred Income Tax	523.1		601.2		78.1
Other Assets1	1,797.6		1,674.4		(123.2)
Total Assets	60,866.7		60,377.9		(488.8)
Liabilities
Policy and Contract Benefits2	$	1,771.4	$	—	$	(1,771.4)
Reserves for Future Policy and Contract Benefits2	42,108.7		—		(42,108.7)
Future Policy Benefits2	—		37,808.0		37,808.0
Policyholders' Account Balances2	—		5,812.8		5,812.8
Unearned Premiums	394.0		406.8		12.8
Deferred Income Tax	6.5		20.9		14.4
Total Liabilities	52,207.2		51,975.1		(232.1)
Stockholders' Equity
Accumulated Other Comprehensive Loss	$	(3,134.7)	$	(3,611.0)	$	(476.3)
Retained Earnings	12,698.3		12,917.9		219.6
Total Stockholders' Equity	8,659.5		8,402.8		(256.7)
1The change in other assets is driven by the cost of reinsurance associated with the second phase of our Closed Block individual disability reinsurance transaction which was completed in the first quarter of 2021. In accordance with the provisions of the ASU related to non-contemporaneous reinsurance, we were then required to establish the ceded reserves using an upper-medium grade fixed-income instrument as of the reinsurance transaction date in March 2021 which resulted in higher ceded reserves compared to that which was reported historically.
2We previously reported policy and contract benefits and reserves for future policy and contract benefits liabilities in our consolidated balance sheet as of September 30, 2022 of $1,771.4 million and $42,108.7 million, respectively, resulting in total policyholder liabilities of $43,880.1 million. These balances were reclassified into new line items, future policy benefits and policyholders' account balances, which would have reported balances of $38,079.8 million and $5,800.3 million, respectively, as of September 30, 2022, resulting in total policyholder liabilities of $43,880.1 million under the historical accounting method.

13

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2023

Note 2 - Accounting Developments - Continued

	December 31, 2022
	Historical Accounting Method		As Adjusted		Effect of Change
	(in millions of dollars)
Consolidated Balance Sheets
Assets
Reinsurance Recoverable	$	10,218.6	$	9,608.0	$	(610.6)
Deferred Acquisition Costs	2,252.3		2,560.0		307.7
Deferred Income Tax	449.8		586.0		136.2
Other Assets	1,786.3		1,666.6		(119.7)
Total Assets	61,434.9		61,148.5		(286.4)
Liabilities
Policy and Contract Benefits1	$	1,839.8	$	—	$	(1,839.8)
Reserves for Future Policy and Contract Benefits1	42,330.2		—		(42,330.2)
Future Policy Benefits1	—		38,577.1		38,577.1
Policyholders' Account Balances1	—		5,740.2		5,740.2
Unearned Premiums	352.7		365.5		12.8
Deferred Income Tax	9.2		25.2		16.0
Total Liabilities	52,237.4		52,413.5		176.1
Stockholders' Equity
Accumulated Other Comprehensive Loss	$	(2,756.6)	$	(3,448.3)	$	(691.7)
Retained Earnings	12,912.1		13,141.3		229.2
Total Stockholders' Equity	9,197.5		8,735.0		(462.5)
1We previously reported policy and contract benefits and reserves for future policy and contract benefits liabilities in our consolidated balance sheet as of December 31, 2022 of $1,839.8 million and $42,330.2 million, respectively, resulting in total policyholder liabilities of $44,170.0 million. These balances were reclassified into new line items, future policy benefits and policyholders' account balances, which would have reported balances of $38,443.2 million and $5,726.8 million, respectively, as of December 31, 2022, resulting in total policyholder liabilities of $44,170.0 million under the historical accounting method.

14

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2023

Note 2 - Accounting Developments - Continued

	Three Months Ended September 30, 2022
	Historical Accounting Method		As Adjusted		Effect of Change
	(in millions of dollars, except share data and where noted)
Consolidated Statements of Income
Premium Income	$	2,391.7	$	2,388.9	$	(2.8)
Policy Benefits1	1,579.3		1,843.2		263.9
Policy Benefits - Remeasurement Gain	—		(341.7)		(341.7)
Amortization of Deferred Acquisition Costs	150.8		102.9		(47.9)
Other Expenses	247.3		243.9		(3.4)
Income Tax - Deferred	(52.3)		(25.6)		26.7
Net Income	410.7		510.3		99.6
Net Income Per Common Share
Basic	$	2.05	$	2.55	$	0.50
Assuming Dilution	$	2.04	$	2.53	$	0.49
Consolidated Statements of Comprehensive Income (Loss)
Net Income	$	410.7	$	510.3	$	99.6
Change in Adjustment to Deferred Acquisition Costs and Reserves for Future Policy and Contract Benefits, Net of Reinsurance	661.4		—		(661.4)
Change in the Effect of Discount Rate Assumptions on the Liability for Future Policy Benefits, Net of Reinsurance	—		2,222.9		2,222.9
Change in Foreign Currency Translation Adjustment	(71.1)		(71.5)		(0.4)
Comprehensive Income (Loss)	(951.8)		708.8		1,660.6
Consolidated Statements of Stockholders' Equity
Accumulated Other Comprehensive Income (Loss)
Balance at Beginning of Period	$	(1,772.2)	$	(3,809.5)	$	(2,037.3)
Other Comprehensive Income (Loss)	(1,362.5)		198.5		1,561.0
Retained Earnings
Balance at Beginning of Period	$	12,353.7	$	12,473.7	$	120.0
Net Income	410.7		510.3		99.6
1 Previously disclosed as Benefits and Change in Reserves for Future Benefits

15

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2023

Note 2 - Accounting Developments - Continued

	Nine Months Ended September 30, 2022
	Historical Accounting Method		As Adjusted		Effect of Change
	(in millions of dollars, except share data and where noted)
Consolidated Statements of Income
Premium Income	$	7,212.3	$	7,206.3	$	(6.0)
Policy Benefits1	5,181.3		5,691.9		510.6
Policy Benefits - Remeasurement Gain	—		(476.1)		(476.1)
Amortization of Deferred Acquisition Costs	449.5		313.0		(136.5)
Other Expenses	744.4		734.4		(10.0)
Income Tax - Deferred	(147.9)		(125.3)		22.6
Net Income	1,034.6		1,118.0		83.4
Net Income Per Common Share
Basic	$	5.14	$	5.55	$	0.41
Assuming Dilution	$	5.11	$	5.52	$	0.41
Consolidated Statements of Comprehensive Income (Loss)
Net Income	$	1,034.6	$	1,118.0	$	83.4
Change in Adjustment to Deferred Acquisition Costs and Reserves for Future Policy and Contract Benefits, Net of Reinsurance	(7,500.7)		—		7,500.7
Change in the Effect of Discount Rate Assumptions on the Liability for Future Policy Benefits, Net of Reinsurance	—		9,252.4		9,252.4
Change in Foreign Currency Translation Adjustment	(164.1)		(164.9)		(0.8)
Comprehensive Income (Loss)	(2,454.2)		2,671.6		5,125.8
Consolidated Statements of Stockholders' Equity
Accumulated Other Comprehensive Income (Loss)
Balance at Beginning of Year	$	354.1	$	(5,164.6)	$	(5,518.7)
Other Comprehensive Income (Loss)	(3,488.8)		1,553.6		5,042.4
Retained Earnings
Balance at Beginning of Year	$	11,853.2	$	11,989.4	$	136.2
Net Income	1,034.6		1,118.0		83.4
Consolidated Statements of Cash Flows
Cash Flows from Operating Activities
Net Income	$	1,034.6	$	1,118.0	$	83.4
Change in Receivables	437.8		457.9		20.1
Change in Deferred Acquisition Costs	30.4		(106.1)		(136.5)
Change in Insurance Liabilities	(125.5)		(112.6)		12.9
Change in Income Taxes	(21.6)		7.3		28.9
Amortization of the Cost of Reinsurance	48.5		38.5		(10.0)
1 Previously disclosed as Benefits and Change in Reserves for Future Benefits

16

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2023

Note 2 - Accounting Developments - Continued

The decrease in AOCI in our recast of 2022 as shown in the preceding charts is driven primarily by the difference between the discount rate applied under the historical accounting method, which was based on an expected investment yield from our current investment strategy, and the single-A discount rate that is required as a part of the adoption of ASU 2018-12. The most significant impact is related to our longest duration products. Our investment strategy reflects the illiquid nature of the majority of our liability cash flows and, as a result, the yields in our investment portfolios supporting the cash outflows required for these products are generally higher than a single-A yield. In addition, the discount rates applied under the historical accounting method to the reserves for our longest duration products, such as long-term care, included an assumption for long-term yields rising to more historical levels.

The net favorable impact of the adoption of ASU 2018-12 to net income for the three and nine months ended September 30, 2022 shown in the preceding charts is due primarily to the following changes:

• Updating the lifetime cohort net premium ratios, or lifetime loss ratio, for actual experience each reporting period will generally cause earnings patterns to be more consistent from period to period, with variances in experience reflected in earnings over the cohort lifetime. This resulted in an unfavorable impact to income for the three and nine months ended September 30, 2022

• Alignment of amortization of deferred acquisition costs to a constant level basis and modification of amortization periods to reflect the expected term of the related contracts could result in either higher or lower income for the affected product lines. This resulted in a net favorable impact to income for the three and nine months ended September 30, 2022.

• Accelerated recognition of the provision for adverse deviation or other differences from current best estimate values for policies issued prior to the transition date and due to not establishing the provision for policies issued on or after the transition date will generally result in higher income most notably in the initial years after the transition date. This resulted in a favorable impact to income for the three and nine months ended September 30, 2022.

• Establishing reserves for claims incurred on or after the transition date at interest rates prescribed by the update could result in either higher or lower income for the affected product lines depending on the policy issue date and the interest rate environment at that time. This resulted in a favorable impact to income for the three and nine months ended September 30, 2022.

• Updating cash flow assumptions could result in either higher or lower income. This resulted in a favorable impact to income for the three and nine months ended September 30, 2022.

• Accounting for non-contemporaneous reinsurance related to the second phase of our Closed Block individual disability reinsurance transaction which was completed in the first quarter of 2021. As a result of the execution of the second phase of the reinsurance transaction occurring after January 1, 2021, the transition date of ASU 2018-12, in accordance with the provisions of the ASU related to non-contemporaneous reinsurance, we were required to establish the ceded reserves using an upper-medium grade fixed-income instrument as of the reinsurance transaction date in March 2021 which resulted in higher ceded reserves compared to that which was reported historically. However, the direct reserves for the block reinsured in the second phase were calculated using the original discount rate utilized as of the transition date. Both the direct and ceded reserves are then remeasured at each reporting period using a current discount rate reflective of an upper-medium grade fixed-income instrument, with the changes recognized in OCI. While the total equity impact is neutral, the different original discount rates utilized for direct and ceded reserves result in disproportionate earnings impacts. The differential in the original discount rate applied to the direct and ceded cohorts of business resulted in an unfavorable impact to income for the three and nine months ended September 30, 2022, partially offset by a decrease in the amortization of the cost of reinsurance as a result of a lower cost of reinsurance.

17

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2023

Note 2 - Accounting Developments - Continued

Accounting Updates Outstanding:

ASU 2020-04, Reference Rate Reform (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial Reporting and related amendments

The amendments in this update provide optional guidance, for a limited period of time, to ease the potential burden in accounting for and recognizing the effects of reference rate reform on financial reporting. The guidance allows for various practical expedients and exceptions when applying GAAP to contracts, hedging relationships, and other transactions affected either by discontinued rates as a direct result of reference rate reform or a market-wide change in interest rates used for discounting, margining or contract price alignment, if certain criteria are met. Specifically, the guidance provides certain practical expedients for contract modifications, fair value hedges, and cash flow hedges, and also provides certain exceptions related to changes in the critical terms of a hedging relationship. The guidance also allows for a one-time election to sell or transfer debt securities that were both classified as held-to-maturity prior to January 1, 2020 and reference a rate affected by the reform.

The adoption of this update is permitted as of the beginning of the interim period that includes March 12, 2020 (the issuance date of the update), or any date thereafter, through December 31, 2024, at which point the guidance will sunset. We do not anticipate needing to adopt this guidance, but we will continue to monitor our contracts and hedging relationships throughout the adoption period.

Note 3 - Fair Value of Financial Instruments

Fair Value Measurements for Financial Instruments Carried at Fair Value

We report fixed maturity securities, which are classified as available-for-sale securities, derivative financial instruments, and unrestricted equity securities at fair value in our consolidated balance sheets. We report our investments in private equity partnerships at our share of the partnerships' net asset value per share or its equivalent (NAV) as a practical expedient for fair value.

The degree of judgment utilized in measuring the fair value of financial instruments generally correlates to the level of pricing observability. Financial instruments with readily available active quoted prices or for which fair value can be measured from actively quoted prices in active markets generally have more pricing observability and less judgment utilized in measuring fair value. An active market for a financial instrument is a market in which transactions for an asset or a similar asset occur with sufficient frequency and volume to provide pricing information on an ongoing basis. A quoted price in an active market provides the most reliable evidence of fair value and should be used to measure fair value whenever available. Conversely, financial instruments rarely traded or not quoted have less observability and are measured at fair value using valuation techniques that require more judgment. Pricing observability is generally impacted by a number of factors, including the type of financial instrument, whether the financial instrument is new to the market and not yet established, the characteristics specific to the transaction, and overall market conditions.

We classify financial instruments in accordance with a fair value hierarchy consisting of three levels based on the observability of valuation inputs:

•Level 1 - the highest category of the fair value hierarchy classification wherein inputs are unadjusted and represent quoted prices in active markets for identical assets or liabilities at the measurement date.

•Level 2 - valued using inputs (other than prices included in Level 1) that are either directly or indirectly observable for the asset or liability through correlation with market data at the measurement date and for the duration of the instrument's anticipated life.

•Level 3 - the lowest category of the fair value hierarchy and reflects the judgment of management regarding what market participants would use in pricing assets or liabilities at the measurement date. Financial assets and liabilities categorized as Level 3 are generally those that are valued using unobservable inputs to extrapolate an estimated fair value.

18

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2023

Note 3 - Fair Value of Financial Instruments - Continued

Valuation Methodologies of Financial Instruments Measured at Fair Value

Valuation techniques used for assets and liabilities accounted for at fair value are generally categorized into three types. The market approach uses prices and other relevant information from market transactions involving identical or comparable assets or liabilities. The income approach converts future amounts, such as cash flows or earnings, to a single present amount, or a discounted amount. The cost approach is based upon the amount that currently would be required to replace the service capacity of an asset, or the current replacement cost.

We use valuation techniques that are appropriate in the circumstances and for which sufficient data are available that can be obtained without undue cost and effort. In some cases, a single valuation technique will be appropriate (for example, when valuing an asset or liability using quoted prices in an active market for identical assets or liabilities). In other cases, multiple valuation techniques will be appropriate. If we use multiple valuation techniques to measure fair value, we evaluate and weigh the results, as appropriate, considering the reasonableness of the range indicated by those results. A fair value measurement is the point within that range that is most representative of fair value in the circumstances.

The selection of the valuation method(s) to apply considers the definition of an exit price and depends on the nature of the asset or liability being valued. For assets and liabilities accounted for at fair value, we generally use valuation techniques consistent with the market approach, and to a lesser extent, the income approach. We believe the market approach provides more observable data than the income approach, considering the type of investments we hold. Our fair value measurements could differ significantly based on the valuation technique and available inputs. When using a pricing service, we obtain the vendor's pricing documentation to ensure we understand their methodologies. We periodically review and approve the selection of our pricing vendors to ensure we are in agreement with their current methodologies. When markets are less active, brokers may rely more on models with inputs based on the information available only to the broker. Our internal investment management professionals, which include portfolio managers and analysts, monitor securities priced by brokers and evaluate their prices for reasonableness based on benchmarking to available primary and secondary market information. In weighing a broker quote as an input to fair value, we place less reliance on quotes that do not reflect the result of market transactions. We also consider the nature of the quote, particularly whether it is a bid or market quote. If prices in an inactive market do not reflect current prices for the same or similar assets, adjustments may be necessary to arrive at fair value. When relevant market data is unavailable, which may be the case during periods of market uncertainty, the income approach can, in suitable circumstances, provide a more appropriate fair value. During 2023, we have applied valuation approaches and techniques on a consistent basis to similar assets and liabilities and consistent with those approaches and techniques used at year end 2022.

Fixed Maturity and Equity Securities

We use observable and unobservable inputs in measuring the fair value of our fixed maturity and equity securities. For securities categorized as Level 1, fair values equal active Trade Reporting and Compliance Engine (TRACE) pricing or unadjusted market maker prices. For securities categorized as Level 2 or Level 3, inputs that may be used in valuing each class of securities at any given time period are disclosed below. Actual inputs used to determine fair values will vary for each reporting period depending on the availability of inputs which may, at times, be affected by the lack of market liquidity.

		Level 2	Level 3
Instrument		Observable Inputs	Unobservable Inputs
United States Government and Government Agencies and Authorities
	Valuation Method	Principally the market approach	Not applicable
	Valuation Techniques / Inputs	Prices obtained from external pricing services

19

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2023

Note 3 - Fair Value of Financial Instruments - Continued

		Level 2	Level 3
Instrument		Observable Inputs	Unobservable Inputs
States, Municipalities, and Political Subdivisions
	Valuation Method	Principally the market approach	Principally the market approach
	Valuation Techniques / Inputs	Prices obtained from external pricing services	Analysis of similar bonds, adjusted for comparability
		Relevant reports issued by analysts and rating agencies
		Audited financial statements
Foreign Governments
	Valuation Method	Principally the market approach	Principally the market approach
	Valuation Techniques / Inputs	Prices obtained from external pricing services	Analysis of similar bonds, adjusted for comparability
		Non-binding broker quotes
		Call provisions
Public Utilities
	Valuation Method	Principally the market and income approaches	Principally the market and income approaches
	Valuation Techniques / Inputs	Prices obtained from external pricing services	Change in benchmark reference
		Non-binding broker quotes	Analysis of similar bonds, adjusted for comparability
		Benchmark yields	Discount for size - illiquidity
		Transactional data for new issuances and secondary trades	Volatility of credit
		Security cash flows and structures	Lack of marketability
		Recent issuance / supply
		Audited financial statements
		Security and issuer level spreads
		Security creditor ratings/maturity/capital structure/optionality
		Public covenants
		Comparative bond analysis
		Relevant reports issued by analysts and rating agencies

20

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2023

Note 3 - Fair Value of Financial Instruments - Continued

		Level 2	Level 3
Instrument		Observable Inputs	Unobservable Inputs
Mortgage/Asset-Backed Securities
	Valuation Method	Principally the market and income approaches	Principally the market approach
	Valuation Techniques / Inputs	Prices obtained from external pricing services	Analysis of similar bonds, adjusted for comparability
		Non-binding broker quotes	Prices obtained from external pricing services
		Security cash flows and structures
		Underlying collateral
		Prepayment speeds/loan performance/delinquencies
		Relevant reports issued by analysts and rating agencies
		Audited financial statements
All Other Corporate Bonds
	Valuation Method	Principally the market and income approaches	Principally the market and income approaches
	Valuation Techniques / Inputs	Prices obtained from external pricing services	Change in benchmark reference
		Non-binding broker quotes	Discount for size - illiquidity
		Benchmark yields	Volatility of credit
		Transactional data for new issuances and secondary trades	Lack of marketability
		Security cash flows and structures	Prices obtained from external pricing services
		Recent issuance / supply
		Security and issuer level spreads
		Security creditor ratings/maturity/capital structure/optionality
		Public covenants
		Comparative bond analysis
		Relevant reports issued by analysts and rating agencies
		Audited financial statements

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Unum Group and Subsidiaries

September 30, 2023

Note 3 - Fair Value of Financial Instruments - Continued

		Level 2	Level 3
Instrument		Observable Inputs	Unobservable Inputs
Redeemable Preferred Stocks
	Valuation Method	Principally the market approach	Principally the market approach
	Valuation Techniques / Inputs	Non-binding broker quotes	Financial statement analysis
		Benchmark yields
		Comparative bond analysis
		Call provisions
		Relevant reports issued by analysts and rating agencies
		Audited financial statements
Perpetual Preferred and Equity Securities
	Valuation Method	Principally the market approach	Principally the market and income approaches
	Valuation Techniques / Inputs	Prices obtained from external pricing services	Financial statement analysis
		Non-binding broker quotes

The management of our investment portfolio includes establishing pricing policy and reviewing the reasonableness of sources and inputs used in developing pricing. We review all prices that vary between multiple pricing vendors by a threshold that is outside a normal market range for the asset type.  In the event we receive a vendor's market price that does not appear reasonable based on our market analysis, we may challenge the price and request further information about the assumptions and methodologies used by the vendor to price the security. We may change the vendor price based on a better data source such as an actual trade. We also review all prices that did not change from the prior month to ensure that these prices are within our expectations. The overall valuation process for determining fair values may include adjustments to valuations obtained from our pricing sources when they do not represent a valid exit price. These adjustments may be made when, in our judgment and considering our knowledge of the financial conditions and industry in which the issuer operates, certain features of the financial instrument require that an adjustment be made to the value originally obtained from our pricing sources. These features may include the complexity of the financial instrument, the market in which the financial instrument is traded, counterparty credit risk, credit structure, concentration, or liquidity. Additionally, an adjustment to the price derived from a model typically reflects our judgment of the inputs that other participants in the market for the financial instrument being measured at fair value would consider in pricing that same financial instrument. In the event an asset is sold, we test the validity of the fair value determined by our valuation techniques by comparing the selling price to the fair value determined for the asset in the immediately preceding month end reporting period.

Certain of our investments do not have readily determinable market prices and/or observable inputs or may at times be affected by the lack of market liquidity. For these securities, we use internally prepared valuations, including valuations based on estimates of future profitability, to estimate the fair value. Additionally, we may obtain prices from independent third-party brokers to aid in establishing valuations for certain of these securities. Key assumptions used by us to determine fair value for these securities include risk free interest rates, risk premiums, performance of underlying collateral (if any), and other factors involving significant assumptions which may or may not reflect those of an active market.

The parameters and inputs used to validate a price on a security may be adjusted for assumptions about risk and current market conditions on a quarter to quarter basis, as certain features may be more significant drivers of valuation at the time of pricing. Changes to inputs in valuations are not changes to valuation methodologies; rather, the inputs are modified to reflect direct or indirect impacts on asset classes from changes in market conditions.

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Unum Group and Subsidiaries

September 30, 2023

Note 3 - Fair Value of Financial Instruments - Continued

At September 30, 2023, approximately 23.7 percent of our fixed maturity securities were valued using active trades from TRACE pricing or broker market maker prices for which there was current market activity in that specific security (comparable to receiving one binding quote).  The prices obtained were not adjusted, and the assets were classified as Level 1.

The remaining 76.3 percent of our fixed maturity securities were valued based on non-binding quotes or other observable and unobservable inputs, as discussed below:

•60.6 percent of our fixed maturity securities were valued based on prices from pricing services that generally use observable inputs such as prices for securities or comparable securities in active markets in their valuation techniques. These assets were classified as Level 2. 

•14.9 percent of our fixed maturity securities were valued based on one or more non-binding broker quotes, if validated by observable market data. When only one price is available, it is used if observable inputs and analysis confirms that it is appropriate. These assets, for which we were able to validate the price using other observable market data, were classified as Level 2.

•0.8 percent of our fixed maturity securities were valued based on prices of comparable securities, internal models, or pricing services or other non-binding quotes with no other observable market data. These assets were classified as either Level 2 or Level 3, with the categorization dependent on whether there was other observable market data.

Derivatives

Fair values for derivatives other than embedded derivatives in modified coinsurance arrangements are based on market quotes or pricing models and represent the net amount of cash we would have paid or received if the contracts had been settled or closed as of the last day of the period. Credit risk related to the counterparty and the Company is considered in determining the fair values of these derivatives. However, since we have collateralization agreements in place with each counterparty which limits our exposure, any credit risk is immaterial. Therefore, we determined that no adjustments for credit risk were required as of September 30, 2023 or December 31, 2022.

Fair values for our embedded derivative in a modified coinsurance arrangement are estimated using internal pricing models and represent the hypothetical value of the duration mismatch of assets and liabilities, interest rate risk, and third party credit risk embedded in the modified coinsurance arrangement.

We consider transactions in inactive markets to be less representative of fair value. We use all available observable inputs when measuring fair value, but when significant unobservable inputs are used, we classify these assets or liabilities as Level 3.

Private Equity Partnerships

Our private equity partnerships represent funds that are primarily invested in private credit, private equity, and real assets, as described below. Distributions received from the funds arise from income generated by the underlying investments as well as the liquidation of the underlying investments. There is generally not a public market for these investments.

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Unum Group and Subsidiaries

September 30, 2023

Note 3 - Fair Value of Financial Instruments - Continued

The following tables present additional information about our private equity partnerships, including commitments for additional investments which may or may not be funded:

		September 30, 2023
Investment Category		Fair Value		Redemption Term / Redemption Notice	Unfunded Commitments
		(in millions of dollars)			(in millions of dollars)
Private Credit	(a)	$	238.0	Not redeemable	$	127.7
		48.7		Quarterly / 90 days notice	3.2
Total Private Credit		286.7			130.9
Private Equity	(b)	514.9		Not redeemable	420.2
		26.4		Initial 5.5 year lock on each new investment / Quarterly after 5.5 year lock with 90 days notice	17.6
Total Private Equity		541.3			437.8
Real Assets	(c)	420.3		Not redeemable	268.2
		32.6		Quarterly / 90 days notice	—
Total Real Assets		452.9			268.2
Total Partnerships		$	1,280.9		$	836.9

		December 31, 2022
Investment Category		Fair Value		Redemption Term / Redemption Notice	Unfunded Commitments
		(in millions of dollars)			(in millions of dollars)
Private Credit	(a)	$	239.3	Not redeemable	$	90.9
		35.7		Initial 2 year lock on each new investment / Quarterly after 2 year lock with 90 days notice	13.4
Total Private Credit		275.0			104.3
Private Equity	(b)	453.6		Not redeemable	377.2
		31.7		Initial 5.5 year lock on each new investment / Quarterly after 5.5 year lock with 90 days notice	39.1
Total Private Equity		485.3			416.3
Real Assets	(c)	373.9		Not redeemable	256.3
		60.1		Quarterly / 90 days notice	—
Total Real Assets		434.0			256.3
Total Partnerships		$	1,194.3		$	776.9

24

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Unum Group and Subsidiaries

September 30, 2023

Note 3 - Fair Value of Financial Instruments - Continued

(a)Private Credit - The limited partnerships described in this category employ various investment strategies, generally providing direct lending or other forms of debt financing including first-lien, second-lien, mezzanine, and subordinated loans. The limited partnerships have credit exposure to corporates, physical assets, and/or financial assets within a variety of industries (including manufacturing, healthcare, energy, business services, technology, materials, and retail) in North America and, to a lesser extent, outside of North America.  As of September 30, 2023, the estimated remaining life of the investments that do not allow for redemptions is approximately 63 percent in the next 3 years, 26 percent during the period from 3 to 5 years, 9 percent during the period from 5 to 10 years, and 2 percent during the period from 10 to 15 years.

(b)Private Equity - The limited partnerships described in this category employ various strategies generally investing in controlling or minority control equity positions directly in companies and/or assets across various industries (including manufacturing, healthcare, energy, business services, technology, materials, and retail), primarily in private markets within North America and, to a lesser extent, outside of North America.  As of September 30, 2023, the estimated remaining life of the investments that do not allow for redemptions is approximately 37 percent in the next 3 years, 28 percent during the period from 3 to 5 years, 28 percent during the period from 5 to 10 years, and 7 percent during the period from 10 to 15 years.

(c)Real Assets - The limited partnerships described in this category employ various strategies, which include investing in the equity and/or debt financing of physical assets, including infrastructure (energy, power, water/wastewater, communications), transportation (including airports, ports, toll roads, aircraft, railcars) and real estate in North America, Europe, South America, and Asia.  As of September 30, 2023, the estimated remaining life of the investments that do not allow for redemptions is approximately 23 percent in the next 3 years, 33 percent during period from 3 to 5 years, 42 percent during the period from 5 to 10 years, and 2 percent during the period from 10 to 15 years.

We record changes in our share of net asset value of the partnerships in net investment income. We receive financial information related to our investments in partnerships and generally record investment income on a one-quarter lag in accordance with our accounting policy.

25

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2023

Note 3 - Fair Value of Financial Instruments - Continued

The following tables present information about financial instruments measured at fair value on a recurring basis by fair value level, based on the observability of the inputs used:

	September 30, 2023
	Level 1		Level 2		Level 3		NAV		Total
	(in millions of dollars)
Assets
Fixed Maturity Securities
United States Government and Government Agencies and Authorities	$	77.0	$	498.0	$	—	$	—	$	575.0
States, Municipalities, and Political Subdivisions	—		3,391.1		—		—		3,391.1
Foreign Governments	—		819.6		—		—		819.6
Public Utilities	650.6		4,310.6		—		—		4,961.2
Mortgage/Asset-Backed Securities	—		559.7		45.2		—		604.9
All Other Corporate Bonds	7,351.0		16,256.1		108.3		—		23,715.4
Redeemable Preferred Stocks	—		3.5		—		—		3.5
Total Fixed Maturity Securities	8,078.6		25,838.6		153.5		—		34,070.7
Other Long-term Investments
Derivatives
Forwards	—		5.0		—		—		5.0
Foreign Exchange Contracts	—		69.8		—		—		69.8
Embedded Derivative in Modified Coinsurance Arrangement	—		—		0.9		—		0.9
Total Derivatives	—		74.8		0.9		—		75.7
Perpetual Preferred and Equity Securities	—		10.4		17.5		—		27.9
Private Equity Partnerships	—		—		—		1,280.9		1,280.9
Total Other Long-term Investments	—		85.2		18.4		1,280.9		1,384.5
Total Financial Instrument Assets Carried at Fair Value	$	8,078.6	$	25,923.8	$	171.9	$	1,280.9	$	35,455.2
Liabilities
Other Liabilities
Derivatives
Forwards	$	—	$	184.1	$	—	$	—	$	184.1
Foreign Exchange Contracts	—		28.6		—		—		28.6
Total Derivatives	—		212.7		—		—		212.7
Total Financial Instrument Liabilities Carried at Fair Value	$	—	$	212.7	$	—	$	—	$	212.7

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2023

Note 3 - Fair Value of Financial Instruments - Continued

	December 31, 2022
	Level 1		Level 2		Level 3		NAV		Total
	(in millions of dollars)
Assets
Fixed Maturity Securities
United States Government and Government Agencies and Authorities	$	81.7	$	416.5	$	—	$	—	$	498.2
States, Municipalities, and Political Subdivisions	8.7		3,448.3		0.2		—		3,457.2
Foreign Governments	—		827.1		—		—		827.1
Public Utilities	160.1		4,796.8		—		—		4,956.9
Mortgage/Asset-Backed Securities	—		551.3		22.0		—		573.3
All Other Corporate Bonds	4,268.6		20,097.3		158.7		—		24,524.6
Redeemable Preferred Stocks	—		3.5		—		—		3.5
Total Fixed Maturity Securities	4,519.1		30,140.8		180.9		—		34,840.8
Other Long-term Investments
Derivatives
Forwards	—		5.6		—		—		5.6
Foreign Exchange Contracts	—		83.5		—		—		83.5
Total Derivatives	—		89.1		—		—		89.1
Perpetual Preferred and Equity Securities	—		9.6		16.2		—		25.8
Private Equity Partnerships	—		—		—		1,194.3		1,194.3
Total Other Long-term Investments	—		98.7		16.2		1,194.3		1,309.2
Total Financial Instrument Assets Carried at Fair Value	$	4,519.1	$	30,239.5	$	197.1	$	1,194.3	$	36,150.0
Liabilities
Other Liabilities
Derivatives
Forwards	$	—	$	48.5	$	—	$	—	$	48.5
Foreign Exchange Contracts	—		25.5		—		—		25.5
Embedded Derivative in Modified Coinsurance Arrangement	—		—		13.9		—		13.9
Total Derivatives	—		74.0		13.9		—		87.9
Total Financial Instrument Liabilities Carried at Fair Value	$	—	$	74.0	$	13.9	$	—	$	87.9

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2023

Note 3 - Fair Value of Financial Instruments - Continued

Changes in assets and liabilities measured at fair value on a recurring basis using significant unobservable inputs (Level 3) are as follows:

	Three Months Ended September 30, 2023
	Fair Value Beginning of Period		Total Realized and Unrealized Investment Gains (Losses) in								Level 3 Transfers				Fair Value End of Period		Change in Unrealized Gain (Loss) on Securities Held at the End of Period included in
			Earnings		OCI		Purchases		Sales/Maturities		Into		Out of				OCI		Earnings
	(in millions of dollars)
Fixed Maturity Securities
Public Utilities	$	—	$	(0.1)	$	0.1	$	—	$	(3.9)	$	3.9	$	—	$	—	$	—	$	—
Mortgage/Asset-Backed Securities	24.1		—		(1.4)		19.0		(1.0)		4.7		(0.2)		45.2		(1.4)		—
All Other Corporate Bonds	128.8		(4.6)		2.0		—		(54.9)		87.5		(50.5)		108.3		2.0		—
Total Fixed Maturity Securities	152.9		(4.7)		0.7		19.0		(59.8)		96.1		(50.7)		153.5		0.6		—
Perpetual Preferred and Equity Securities	17.5		—		—		—		—		—		—		17.5		—		—
Embedded Derivative in Modified Coinsurance Arrangement	(8.4)		9.3		—		—		—		—		—		0.9		—		9.3

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2023

Note 3 - Fair Value of Financial Instruments - Continued

	Three Months Ended September 30, 2022
	Fair Value Beginning of Period		Total Realized and Unrealized Investment Gains (Losses) in								Level 3 Transfers				Fair Value End of Period		Change in Unrealized Gain (Loss) on Securities Held at the End of Period included in
			Earnings		OCI		Purchases		Sales/Maturities		Into		Out of				OCI		Earnings
	(in millions of dollars)
Fixed Maturity Securities
States, Municipalities, and Political Subdivisions	$	—	$	—	$	(0.1)	$	—	$	—	$	0.3	$	—	$	0.2	$	(0.1)	$	—
Foreign Governments	20.2		—		(0.2)		—		—		—		—		20.0		(0.2)		—
Public Utilities	13.6		(0.4)		—		—		—		—		—		13.2		—		(0.4)
Mortgage/Asset-Backed Securities	11.6		—		0.6		—		(0.3)		0.2		(0.9)		11.2		0.6		—
All Other Corporate Bonds	103.5		—		(5.4)		1.3		(13.0)		57.9		(20.9)		123.4		(5.4)		—
Total Fixed Maturity Securities	148.9		(0.4)		(5.1)		1.3		(13.3)		58.4		(21.8)		168.0		(5.1)		(0.4)
Perpetual Preferred and Equity Securities	10.9		(0.1)		—		2.7		—		—		—		13.5		—		(0.1)
Embedded Derivative in Modified Coinsurance Arrangement	(34.3)		14.9		—		—		—		—		—		(19.4)		—		14.9

29

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2023

Note 3 - Fair Value of Financial Instruments - Continued

	Nine Months Ended September 30, 2023
	Fair Value Beginning of Year		Total Realized and Unrealized Investment Gains (Losses) in								Level 3 Transfers				Fair Value End of Period		Change in Unrealized Gain (Loss) on Securities Held at the End of Period included in
			Earnings		OCI		Purchases		Sales/Maturities		Into		Out of				OCI		Earnings
	(in millions of dollars)
Fixed Maturity Securities
States, Municipalities, and Political Subdivisions	$	0.2	$	—	$	—	$	—	$	—	$	—	$	(0.2)	$	—	$	—	$	—
Public Utilities	—		0.1		(0.1)		—		(7.2)		7.2		—		—		—		—
Mortgage/Asset-Backed Securities	22.0		—		(1.5)		29.9		(2.8)		6.6		(9.0)		45.2		(1.5)		—
All Other Corporate Bonds	158.7		(5.1)		(20.6)		1.5		(229.8)		276.0		(72.4)		108.3		(20.6)		—
Total Fixed Maturity Securities	180.9		(5.0)		(22.2)		31.4		(239.8)		289.8		(81.6)		153.5		(22.1)		—
Perpetual Preferred and Equity Securities	16.2		0.6		—		0.7		—		—		—		17.5		—		0.6
Embedded Derivative in Modified Coinsurance Arrangement	(13.9)		14.8		—		—		—		—		—		0.9		—		14.8

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2023

Note 3 - Fair Value of Financial Instruments - Continued

	Nine Months Ended September 30, 2022
	Fair Value Beginning of Year		Total Realized and Unrealized Investment Gains (Losses) in								Level 3 Transfers				Fair Value End of Period		Change in Unrealized Gain (Loss) on Securities Held at the End of Period included in
			Earnings		OCI		Purchases		Sales/Maturities		Into		Out of				OCI		Earnings
	(in millions of dollars)
Fixed Maturity Securities
States, Municipalities, and Political Subdivisions	$	13.4	$	—	$	(0.1)	$	0.3	$	—	$	—	$	(13.4)	$	0.2	$	(0.1)	$	—
Foreign Governments	20.8		—		(0.8)		—		—		—		—		20.0		(0.8)		—
Public Utilities	44.5		(4.6)		2.2		—		(10.8)		15.6		(33.7)		13.2		2.2		(4.6)
Mortgage/Asset-Backed Securities	187.2		—		(1.2)		9.9		(9.5)		—		(175.2)		11.2		(1.2)		—
All Other Corporate Bonds	861.5		—		(29.5)		8.8		(20.9)		18.3		(714.8)		123.4		(29.5)		—
Total Fixed Maturity Securities	1,127.4		(4.6)		(29.4)		19.0		(41.2)		33.9		(937.1)		168.0		(29.4)		(4.6)
Perpetual Preferred and Equity Securities	5.8		2.7		—		5.0		—		—		—		13.5		—		2.7
Embedded Derivative in Modified Coinsurance Arrangement	(30.1)		10.7		—		—		—		—		—		(19.4)		—		10.7

Realized and unrealized investment gains and losses presented in the preceding tables represent gains and losses only for the time during which the applicable financial instruments were classified as Level 3. The transfers between levels resulted primarily from a change in observability of three inputs used to determine fair values of the securities transferred: (1) transactional data for new issuance and secondary trades, (2) broker/dealer quotes and pricing, primarily related to changes in the level of activity in the market and whether the market was considered orderly, and (3) comparable bond metrics from which to perform an analysis. For fair value measurements of financial instruments that were transferred either into or out of Level 3, we reflect the transfers using the fair value at the beginning of the period. We believe this allows for greater transparency, as all changes in fair value that arise during the reporting period of the transfer are disclosed as a component of our Level 3 reconciliation.

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Unum Group and Subsidiaries

September 30, 2023

Note 3 - Fair Value of Financial Instruments - Continued

The table below provides quantitative information regarding the significant unobservable inputs used in Level 3 fair value measurements derived from internal models. Unobservable inputs for fixed maturity securities are weighted by the fair value of the securities. Certain securities classified as Level 3 are excluded from the table below due to limitations in our ability to obtain the underlying inputs used by external pricing sources.

	September 30, 2023
	Fair Value		Valuation Method	Unobservable Input		Range/Weighted Average
	(in millions of dollars)
Fixed Maturity Securities
All Other Corporate Bonds - Private	$	16.2	Market Approach	Volatility of Credit Market Convention	(a) (b)	5.00% - 5.00% / 5.00% Priced at Par Value
Perpetual Preferred and Equity Securities	17.5		Market Approach	Market Convention	(b)	Priced at Cost, Owner's Equity, or Most Recent Round
Embedded Derivative in Modified Coinsurance Arrangement	0.9		Discounted Cash Flows	Projected Liability Cash Flows Weighted Spread of Swap Curve	(c)	Actuarial Assumptions 0.2%

	December 31, 2022
	Fair Value		Valuation Method	Unobservable Input		Range/Weighted Average
	(in millions of dollars)
Fixed Maturity Securities
All Other Corporate Bonds - Private	$	15.3	Market Approach	Volatility of Credit Market Convention	(a) (b)	5.41% - 5.41% / 5.41% Priced at Par Value
Perpetual Preferred and Equity Securities	16.2		Market Approach	Market Convention	(b)	Priced at Cost, Owner's Equity, or Most Recent Round
Embedded Derivative in Modified Coinsurance Arrangement	(13.9)		Discounted Cash Flows	Projected Liability Cash Flows Weighted Spread of Swap Curve	(c)	Actuarial Assumptions 0.6%

(a)Represents basis point adjustments for credit-specific factors

(b)Represents a decision to price based on par value, cost, owner's equity, or the price of the most recent capital funding round when limited data is available

(c)Represents various actuarial assumptions required to derive the liability cash flows. Fair value of embedded derivative is most often driven by the change in the weighted average credit spread to the swap curve for the assets backing the hypothetical loan

Other than market convention, the impact of isolated decreases in unobservable inputs will result in a higher estimated fair value, whereas isolated increases in unobservable inputs will result in a lower estimated fair value. The unobservable input for market convention is not sensitive to input movements. The projected liability cash flows used in the fair value measurement of our Level 3 embedded derivative are based on expected claim payments. If claim payments increase, the projected liability cash flows will increase, resulting in a decrease in the fair value of the embedded derivative. Decreases in projected liability cash flows will result in an increase in the fair value of the embedded derivative.

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Unum Group and Subsidiaries

September 30, 2023

Note 3 - Fair Value of Financial Instruments - Continued

Fair Value Measurements for Financial Instruments Not Carried at Fair Value

The methods and assumptions used to estimate fair values of financial instruments not carried at fair value are discussed as follows:

Mortgage Loans: Fair value of newly originated, seasoned performing, or sub-performing but likely to continue cash flowing loans are calculated using a discounted cash flow analysis. Loans’ cash flows are modeled and appropriately discounted by a rate based on current yields and credit spreads. For sub and non-performing loans where there is some probability the loan will not continue to pay, a price based approach would be used to estimate the loan’s value in the open market utilizing current transaction information from similar loans.

Policy Loans: Fair values for policy loans, net of reinsurance ceded, are estimated using discounted cash flow analyses and interest rates currently being offered to policyholders with similar policies. Carrying amounts for ceded policy loans, which equal $3,229.7 million and $3,312.5 million as of September 30, 2023 and December 31, 2022, respectively, approximate fair value and are reported on a gross basis in our consolidated balance sheets. A change in interest rates for ceded policy loans will not impact our financial position because the benefits and risks are fully ceded to reinsuring counterparties.

Miscellaneous Long-term Investments: Carrying amounts for tax credit partnerships equal the unamortized balance of our contractual commitments and approximate fair value. Our shares of Federal Home Loan Bank (FHLB) common stock are carried at cost, which approximates fair value.

Long-term Debt: Fair values for long-term debt are obtained from independent pricing services or discounted cash flow analyses based on current incremental borrowing rates for similar types of borrowing arrangements.

FHLB Funding Agreements: Funding agreements with the FHLB represent cash advances used for the purpose of investing in fixed maturity securities. Carrying amounts approximate fair value.

Unfunded Commitments to Investment Partnerships: Unfunded equity commitments represent amounts that we have committed to fund certain investment partnerships. These commitments are legally binding, subject to the partnerships meeting specified conditions. Carrying amounts of these financial instruments approximate fair value.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2023

Note 3 - Fair Value of Financial Instruments - Continued

The following table presents the carrying amounts and estimated fair values of our financial instruments not measured at fair value and indicates the level in the fair value hierarchy of the estimated fair value measurement based on the observability of the inputs used:

	September 30, 2023
	Estimated Fair Value
	Level 1		Level 2		Level 3		Total		Carrying Value
	(in millions of dollars)
Assets
Mortgage Loans	$	—	$	1,984.5	$	—	$	1,984.5	$	2,321.5
Policy Loans	—		—		3,654.0		3,654.0		3,596.6
Other Long-term Investments
Miscellaneous Long-term Investments	—		16.3		0.5		16.8		16.8
Total Financial Instrument Assets Not Carried at Fair Value	$	—	$	2,000.8	$	3,654.5	$	5,655.3	$	5,934.9
Liabilities
Long-term Debt	$	2,593.2	$	390.5	$	—	$	2,983.7	$	3,429.8
Other Liabilities
Unfunded Commitments	—		0.2		—		0.2		0.2
Payable for Collateral on FHLB Funding Agreements	—		76.9		—		76.9		76.9
Total Financial Instrument Liabilities Not Carried at Fair Value	$	2,593.2	$	467.6	$	—	$	3,060.8	$	3,506.9

34

Table of Contents

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2023

Note 3 - Fair Value of Financial Instruments - Continued

	December 31, 2022
	Estimated Fair Value
	Level 1		Level 2		Level 3		Total		Carrying Value
	(in millions of dollars)
Assets
Mortgage Loans	$	—	$	2,159.5	$	—	$	2,159.5	$	2,435.4
Policy Loans	—		—		3,677.0		3,677.0		3,601.2
Other Long-term Investments
Miscellaneous Long-term Investments	—		17.1		1.3		18.4		18.4
Total Financial Instrument Assets Not Carried at Fair Value	$	—	$	2,176.6	$	3,678.3	$	5,854.9	$	6,055.0
Liabilities
Long-term Debt	$	2,288.9	$	783.1	$	—	$	3,072.0	$	3,427.8
Other Liabilities
Unfunded Commitments	—		0.7		—		0.7		0.7
Payable for Collateral on FHLB Funding Agreements	—		99.1		—		99.1		99.1
Total Financial Instrument Liabilities Not Carried at Fair Value	$	2,288.9	$	882.9	$	—	$	3,171.8	$	3,527.6

The carrying values of financial instruments such as short-term investments, cash and bank deposits, accounts and premiums receivable, accrued investment income, securities lending agreements, and short-term debt approximate fair value due to the short-term nature of the instruments. As such, these financial instruments are not included in the above chart.

Fair values for insurance contracts other than investment contracts are not required to be disclosed. However, the fair values of liabilities under all insurance contracts are taken into consideration in our overall management of interest rate risk, which seeks to minimize exposure to changing interest rates through the matching of investment maturities with amounts due under insurance contracts.

35

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2023

Note 4 - Investments

Fixed Maturity Securities

At September 30, 2023 and December 31, 2022, all fixed maturity securities were classified as available-for-sale. The amortized cost and fair values of securities by security type are shown as follows:

	September 30, 2023
	Amortized Cost, Gross of ACL1		ACL1		Gross Unrealized Gain		Gross Unrealized Loss		Fair Value
	(in millions of dollars)
United States Government and Government Agencies and Authorities	$	605.2	$	—	$	7.9	$	38.1	$	575.0
States, Municipalities, and Political Subdivisions	4,066.9		—		49.8		725.6		3,391.1
Foreign Governments	945.7		—		12.8		138.9		819.6
Public Utilities	5,410.5		—		67.7		517.0		4,961.2
Mortgage/Asset-Backed Securities	655.0		—		4.1		54.2		604.9
All Other Corporate Bonds	26,537.0		—		282.4		3,104.0		23,715.4
Redeemable Preferred Stocks	4.0		—		—		0.5		3.5
Total Fixed Maturity Securities	$	38,224.3	$	—	$	424.7	$	4,578.3	$	34,070.7

	December 31, 2022
	Amortized Cost, Gross of ACL1		ACL1		Gross Unrealized Gain		Gross Unrealized Loss		Fair Value
	(in millions of dollars)
United States Government and Government Agencies and Authorities	$	503.8	$	—	$	20.3	$	25.9	$	498.2
States, Municipalities, and Political Subdivisions	4,006.0		—		87.1		635.9		3,457.2
Foreign Governments	908.1		—		34.9		115.9		827.1
Public Utilities	5,170.9		—		141.0		355.0		4,956.9
Mortgage/Asset-Backed Securities	592.1		—		8.2		27.0		573.3
All Other Corporate Bonds	26,640.3		—		452.1		2,567.8		24,524.6
Redeemable Preferred Stocks	4.0		—		—		0.5		3.5
Total Fixed Maturity Securities	$	37,825.2	$	—	$	743.6	$	3,728.0	$	34,840.8

1 Allowance for Credit Losses

36

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2023

Note 4 - Investments - Continued

The following charts indicate the length of time our fixed maturity securities have been in a gross unrealized loss position.

	September 30, 2023
	Less Than 12 Months				12 Months or Greater
	Fair Value		Gross Unrealized Loss		Fair Value		Gross Unrealized Loss
	(in millions of dollars)
United States Government and Government Agencies and Authorities	$	245.5	$	8.8	$	186.2	$	29.3
States, Municipalities, and Political Subdivisions	670.3		35.5		1,851.7		690.1
Foreign Governments	152.4		30.8		224.2		108.1
Public Utilities	1,914.7		105.6		1,611.2		411.4
Mortgage/Asset-Backed Securities	189.8		13.2		301.0		41.0
All Other Corporate Bonds	5,012.4		327.8		13,492.9		2,776.2
Redeemable Preferred Stocks	—		—		3.5		0.5
Total Fixed Maturity Securities	$	8,185.1	$	521.7	$	17,670.7	$	4,056.6

	December 31, 2022
	Less Than 12 Months				12 Months or Greater
	Fair Value		Gross Unrealized Loss		Fair Value		Gross Unrealized Loss
	(in millions of dollars)
United States Government and Government Agencies and Authorities	$	246.6	$	22.6	$	12.2	$	3.3
States, Municipalities, and Political Subdivisions	1,920.1		476.1		346.6		159.8
Foreign Governments	160.1		47.9		176.9		68.0
Public Utilities	2,242.2		252.0		255.2		103.0
Mortgage/Asset-Backed Securities	386.6		27.0		0.1		—
All Other Corporate Bonds	15,865.6		1,799.7		2,194.1		768.1
Redeemable Preferred Stocks	3.5		0.5		—		—
Total Fixed Maturity Securities	$	20,824.7	$	2,625.8	$	2,985.1	$	1,102.2

37

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2023

Note 4 - Investments - Continued

The following is a distribution of the maturity dates for fixed maturity securities. The maturity dates have not been adjusted for possible calls or prepayments.

	September 30, 2023
	Amortized Cost, Net of ACL1		Unrealized Gain Position				Unrealized Loss Position
			Gross Gain		Fair Value		Gross Loss		Fair Value
	(in millions of dollars)
1 year or less	$	945.9	$	1.3	$	352.8	$	5.0	$	589.4
Over 1 year through 5 years	7,541.9		67.7		1,988.1		311.5		5,310.0
Over 5 years through 10 years	9,393.8		187.5		2,879.0		955.4		5,746.9
Over 10 years	19,687.7		164.1		2,880.9		3,252.2		13,718.7
	37,569.3		420.6		8,100.8		4,524.1		25,365.0
Mortgage/Asset-Backed Securities	655.0		4.1		114.1		54.2		490.8
Total Fixed Maturity Securities	$	38,224.3	$	424.7	$	8,214.9	$	4,578.3	$	25,855.8

	December 31, 2022
	Amortized Cost, Net of ACL1		Unrealized Gain Position				Unrealized Loss Position
			Gross Gain		Fair Value		Gross Loss		Fair Value
	(in millions of dollars)
1 year or less	$	1,133.5	$	2.9	$	339.1	$	5.7	$	791.6
Over 1 year through 5 years	7,090.8		86.7		1,953.2		238.4		4,985.9
Over 5 years through 10 years	10,096.7		294.8		3,538.9		863.8		5,988.8
Over 10 years	18,912.1		351.0		5,013.2		2,593.1		11,656.8
	37,233.1		735.4		10,844.4		3,701.0		23,423.1
Mortgage/Asset-Backed Securities	592.1		8.2		186.6		27.0		386.7
Total Fixed Maturity Securities	$	37,825.2	$	743.6	$	11,031.0	$	3,728.0	$	23,809.8

1 Allowance for Credit Losses

The following chart depicts an analysis of our fixed maturity security portfolio between investment-grade and below-investment-grade categories as of September 30, 2023:

					Gross Unrealized Loss
	Fair Value		Gross Unrealized Gain		Amount		Percent of Total Gross Unrealized Loss
	(in millions of dollars)
Investment-Grade	$	32,659.4	$	420.6	$	4,404.0	96.2	%
Below-Investment-Grade	1,411.3		4.1		174.3		3.8
Total Fixed Maturity Securities	$	34,070.7	$	424.7	$	4,578.3	100.0	%

The unrealized losses on investment-grade fixed maturity securities principally relate to changes in interest rates or changes in market or sector credit spreads which occurred subsequent to the acquisition of the securities. Below-investment-grade fixed maturity securities are generally more likely to develop credit concerns than investment-grade securities. At September 30, 2023, the unrealized losses in our below-investment-grade fixed maturity securities were generally due to credit spreads in certain industries or sectors and, to a lesser extent, credit concerns related to specific securities. For each specific security in an unrealized loss position, we believe that there are positive factors which mitigate credit concerns and that the securities for which we have not recorded a credit loss will recover in value. We have the ability and intent to continue to hold these securities to recovery of amortized cost and believe that no credit losses have occurred.

38

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2023

Note 4 - Investments - Continued

As of September 30, 2023, we held 968 individual investment-grade fixed maturity securities and 93 individual below-investment-grade fixed maturity securities that were in an unrealized loss position, of which 813 investment-grade fixed maturity securities and 79 below-investment-grade fixed maturity securities had been in an unrealized loss position continuously for over one year.

In determining when a decline in fair value below amortized cost of a fixed maturity security represents a credit loss, we evaluate the following factors:

•Whether we expect to recover the entire amortized cost basis of the security

•Whether we intend to sell the security or will be required to sell the security before the recovery of its amortized cost basis

•Whether the security is current as to principal and interest payments

•The significance of the decline in value

•Current and future business prospects and trends of earnings

•The valuation of the security's underlying collateral

•Relevant industry conditions and trends relative to their historical cycles

•Market conditions

•Rating agency and governmental actions

•Bid and offering prices and the level of trading activity

•Adverse changes in estimated cash flows for securitized investments

•Changes in fair value subsequent to the balance sheet date

•Any other key measures for the related security

While determining whether a credit loss exists is a judgmental area, we utilize a formal, well-defined, and disciplined process to monitor and evaluate our fixed income investment portfolio, supported by issuer specific research and documentation as of the end of each period. The process results in a thorough evaluation of investments and the recording of credit losses on a timely basis for investments determined to have a credit loss. We calculate the allowance for credit losses of fixed maturity securities based on the present value of our best estimate of cash flows expected to be collected, discounted using the effective interest rate implicit in the security at the date of acquisition. When estimating future cash flows, we analyze the strength of the issuer’s balance sheet, its debt obligations and near-term funding arrangements, cash flow and liquidity, the profitability of its core businesses, the availability of marketable assets which could be sold to increase liquidity, its industry fundamentals and regulatory environment, and its access to capital markets.

39

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2023

Note 4 - Investments - Continued

The following tables present a rollforward of the allowance for credit losses on available-for-sale fixed maturity securities, which were classified as "public utilities" during the three and nine months ended September 30, 2022.

	Three Months Ended September 30
	2023		2022
	(in millions of dollars)
Balance, beginning of period	$	—	$	4.1
Change in allowance on securities with allowance recorded in previous period	—		0.5
Balance, end of period	$	—	$	4.6

	Nine Months Ended September 30
	2023		2022
	(in millions of dollars)
Balance, beginning of period	$	—	$	—
Credit losses on securities for which credit losses were not previously recorded	—		4.6
Balance, end of period	$	—	$	4.6

At September 30, 2023, we had commitments of $53.8 million to fund private placement fixed maturity securities, the amount of which may or may not be funded. 

Variable Interest Entities

We invest in variable interests issued by variable interest entities. These investments, which are passive in nature, include minority ownership interests in private equity partnerships, tax credit partnerships, and special purpose entities. For those variable interests that are not consolidated in our financial statements, we are not the primary beneficiary because we have neither the power to direct the activities that are most significant to economic performance nor the responsibility to absorb a majority of the expected losses. The determination of whether we are the primary beneficiary is performed at the time of our initial investment and at the date of each subsequent reporting period.

As of September 30, 2023, the carrying amount of our variable interest entity investments that are not consolidated in our financial statements was $1,281.4 million, comprised of $0.5 million of tax credit partnerships and $1,280.9 million of private equity partnerships. At December 31, 2022, the carrying amount of our variable interest entity investments that are not consolidated in our financial statements was $1,195.3 million, comprised of $1.0 million of tax credit partnerships and $1,194.3 million of private equity partnerships.  These variable interest entity investments are reported as other long-term investments in our consolidated balance sheets.

Mortgage Loans

Our mortgage loan portfolio is well diversified by both geographic region and property type to reduce risk of concentration. All of our mortgage loans are collateralized by commercial real estate. When issuing a new loan, our general policy is not to exceed a loan-to-value ratio, or the ratio of the loan balance to the estimated fair value of the underlying collateral, of 75 percent. We update the loan-to-value ratios based on internal valuation of the collateral at least every three years for each loan, and properties undergo a general inspection at least every two years. Our general policy for newly issued loans is to have a debt service coverage ratio greater than 1.25 times on a normalized 25 year amortization period. We update our debt service coverage ratios annually.

We carry our mortgage loans at amortized cost less an allowance for expected credit losses. The amortized cost of our mortgage loans was $2,331.7 million and $2,444.7 million at September 30, 2023 and December 31, 2022, respectively. The allowance for expected credit losses was $10.2 million and $9.3 million at September 30, 2023 and December 31, 2022, respectively. Interest income is accrued on the principal amount of the loan based on the loan's contractual interest rate. We

40

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2023

Note 4 - Investments - Continued

report accrued interest income for our mortgage loans as accrued investment income on our consolidated balance sheets, and the amount of the accrued income was $7.2 million and $7.7 million at September 30, 2023 and December 31, 2022, respectively.

The carrying amount of mortgage loans by property type and geographic region are presented below.

	September 30, 2023				December 31, 2022
	(in millions of dollars)
	Carrying Amount		Percent of Total		Carrying Amount		Percent of Total
Property Type
Apartment	$	674.8	29.1	%	$	688.6	28.3	%
Industrial	715.5		30.8		745.3		30.6
Office	384.1		16.5		423.0		17.4
Retail	504.1		21.7		534.5		21.9
Other	43.0		1.9		44.0		1.8
Total	$	2,321.5	100.0	%	$	2,435.4	100.0	%
Region
New England	$	55.7	2.4	%	$	52.4	2.2	%
Mid-Atlantic	156.8		6.8		192.4		7.9
East North Central	300.2		12.9		313.0		12.9
West North Central	171.2		7.4		181.4		7.4
South Atlantic	553.6		23.8		539.3		22.1
East South Central	98.8		4.3		101.8		4.2
West South Central	202.7		8.7		212.6		8.7
Mountain	284.8		12.3		298.7		12.3
Pacific	497.7		21.4		543.8		22.3
Total	$	2,321.5	100.0	%	$	2,435.4	100.0	%

The risk in our mortgage loan portfolio is primarily related to vacancy rates. Events or developments, such as economic conditions that impact the ability of the borrowers to ensure occupancy of the property, may have a negative effect on our mortgage loan portfolio, particularly to the extent that our portfolio is concentrated in an affected region or property type. An increase in vacancies increases the probability of default, which would negatively affect our expected losses in our mortgage loan portfolio.

We evaluate each of our mortgage loans individually for impairment and assign an internal quality rating based on a comprehensive rating system used to evaluate the risk of the loan. The factors we use to derive our internal quality ratings may include the following:

•Loan-to-value ratio based on internal valuation of property

•Debt service coverage ratio based on current operating income

•Property location, including regional economics, trends and demographics

•Age, condition, and construction quality of property

•Current and historical occupancy of property

•Lease terms relative to market

•Tenant size and financial strength

•Borrower's financial strength

•Borrower's equity in transaction

•Additional collateral, if any

Although all available and applicable factors are considered in our analysis, loan-to-value and debt service coverage ratios are the most critical factors in determining whether we will initially issue the loan and also in assigning values and determining

41

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2023

Note 4 - Investments - Continued

impairment. We assign an overall rating to each loan using an internal rating scale of AA (highest quality) to B (lowest quality). We review and adjust, as needed, our internal quality ratings on an annual basis. This review process is performed more frequently for mortgage loans deemed to have a higher risk of delinquency.

We estimate an allowance for credit losses that we expect to incur over the life of our mortgage loans using a probability of default method. For each loan, we estimate the probability that the loan will default before its maturity (probability of default) and the amount of the loss if the loan defaults (loss given default). These two factors result in an expected loss percentage that is applied to the amortized cost of each loan to determine the expected credit loss. As we are the original underwriter of the mortgage loans, the amortized cost generally equals the principal amount of the loan. We measure losses on defaults of our mortgage loans as the excess amortized cost of the mortgage loan over the fair value of the underlying collateral in the event that we foreclose on the loan or over the expected future cash flows of the loan if we retain the mortgage loan until payoff. We do not purchase mortgage loans with existing credit impairments.

In estimating the probability of default, we consider historical experience, current market conditions, and reasonable and supportable forecasts about the future market conditions. We utilize our historical loan experience in combination with a large third-party industry database for a period of time that aligns with the average life of our loans based on the maturity dates of the loans and prepayment experience. Our model utilizes an industry database of the historical loss experience based on our actual portfolio characteristics such as loan-to-value, debt service coverage, collateral type, geography, and late payment history. In addition, because we actively manage our portfolio, we may extend the term of a loan in certain situations and will accordingly extend the maturity date in the estimate of probability of default. In estimating the loss given default, we primarily consider the type and value of collateral and secondarily the expected liquidation costs and time to recovery.

The primary market factors that we consider in our forecast of future market conditions are gross domestic product, unemployment rates, interest rates, inflation, commercial real estate values, household formation, and retail sales. We also forecast certain loan specific factors such as growth in the fair value and net operating income of collateral by property type. We include our estimate of these factors over a two-year period and for the remainder of the loans’ estimated lives, adjusted for estimated prepayments. Past the two-year forecast period, we revert to the historical assumptions ratably by the end of the fifth year of the loan after which we utilize only historical assumptions.

We utilize various scenarios to estimate our allowance for expected losses ranging from a base case scenario that reflects normal market conditions to a severe case scenario that reflects adverse market conditions. We will adjust our allowance each period to utilize the scenario or weighting of the scenarios that best reflects our view of current market conditions.

42

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2023

Note 4 - Investments - Continued

The following tables present information about mortgage loans by the applicable internal quality indicators:

	September 30, 2023				December 31, 2022
	(in millions of dollars)
	Carrying Amount		Percent of Total		Carrying Amount		Percent of Total
Internal Mortgage Rating
AA	$	85.9	3.7	%	$	92.3	3.8	%
A	885.4		38.1		843.9		34.6
BBB	1,309.1		56.4		1,458.0		59.9
BB	41.1		1.8		41.2		1.7
Total	$	2,321.5	100.0	%	$	2,435.4	100.0	%
Loan-to-Value Ratio1
<= 65%	$	1,351.8	58.3	%	$	1,389.6	57.0	%
> 65% <= 75%	762.4		32.8		937.2		38.5
> 75% <= 85%	137.9		5.9		75.0		3.1
> 85%	69.4		3.0		33.6		1.4
Total	$	2,321.5	100.0	%	$	2,435.4	100.0	%

1Loan-to-Value Ratio utilizes the most recent internal valuation of the property

43

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2023

Note 4 - Investments - Continued

There were no gross write-offs for the periods ending September 30, 2023 or December 31, 2022. The following tables present the amortized cost of our mortgage loans by year of origination and internal quality indicators at September 30, 2023 and December 31, 2022, respectively:

	September 30, 2023
	Prior to 2019		2019		2020		2021		2022		2023		Total
	(in millions of dollars)
Internal Mortgage Rating
AA	$	75.0	$	11.0	$	—	$	—	$	—	$	—	$	86.0
A	585.1		101.0		71.3		90.9		23.4		15.5		887.2
BBB	657.6		226.3		95.3		259.4		64.5		13.0		1,316.1
BB	42.4		—		—		—		—		—		42.4
Total Amortized Cost	1,360.1		338.3		166.6		350.3		87.9		28.5		2,331.7
Allowance for credit losses	(6.6)		(1.3)		(0.6)		(1.0)		(0.6)		(0.1)		(10.2)
Carrying Amount	$	1,353.5	$	337.0	$	166.0	$	349.3	$	87.3	$	28.4	$	2,321.5
Loan-to-Value Ratio1
<=65%	$	882.6	$	199.0	$	110.8	$	146.2	$	16.4	$	—	$	1,355.0
>65<=75%	308.1		139.3		47.5		172.0		71.5		28.5		766.9
>75%<=85%	98.3		—		8.3		32.1		—		—		138.7
>85%	71.1		—		—		—		—		—		71.1
Total Amortized Cost	1,360.1		338.3		166.6		350.3		87.9		28.5		2,331.7
Allowance for credit losses	(6.6)		(1.3)		(0.6)		(1.0)		(0.6)		(0.1)		(10.2)
Carrying Amount	$	1,353.5	$	337.0	$	166.0	$	349.3	$	87.3	$	28.4	$	2,321.5

1Loan-to-Value Ratio utilizes the most recent internal valuation of the property

44

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2023

Note 4 - Investments - Continued

	December 31, 2022
	Prior to 2018		2018		2019		2020		2021		2022		Total
	(in millions of dollars)
Internal Mortgage Rating
AA	$	53.8	$	27.5	$	11.1	$	—	$	—	$	—	$	92.4
A	485.0		123.3		96.8		35.9		80.6		24.0		845.6
BBB	534.0		219.8		236.9		134.0		275.8		64.6		1,465.1
BB	35.7		5.9		—		—		—		—		41.6
Total Amortized Cost	1,108.5		376.5		344.8		169.9		356.4		88.6		2,444.7
Allowance for credit losses	(4.3)		(1.8)		(1.3)		(0.6)		(0.8)		(0.5)		(9.3)
Carrying Amount	$	1,104.2	$	374.7	$	343.5	$	169.3	$	355.6	$	88.1	$	2,435.4
Loan-to-Value Ratio1
<=65%	$	782.6	$	189.0	$	193.9	$	81.3	$	128.9	$	16.9	$	1,392.6
>65<=75%	230.2		181.6		150.9		80.1		227.5		71.7		942.0
>75%<=85%	67.5		—		—		8.5		—		—		76.0
>85%	28.2		5.9		—		—		—		—		34.1
Total Amortized Cost	1,108.5		376.5		344.8		169.9		356.4		88.6		2,444.7
Allowance for credit losses	(4.3)		(1.8)		(1.3)		(0.6)		(0.8)		(0.5)		(9.3)
Carrying Amount	$	1,104.2	$	374.7	$	343.5	$	169.3	$	355.6	$	88.1	$	2,435.4

1Loan-to-Value Ratio utilizes the most recent internal valuation of the property

45

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2023

Note 4 - Investments - Continued

The following table presents a roll-forward of the allowance for expected credit losses by loan-to-value ratio for the three and nine months ended September 30, 2023 and 2022:

	Three Months Ended September 30, 2023
	Beginning of Period		Current Period Provisions		Write-Offs		Recoveries		End of Period
	(in millions of dollars)
Loan-to-Value Ratio1
<=65%	$	3.3	$	(0.1)	$	—	$	—	$	3.2
>65<=75%	4.8		(0.4)		—		—		4.4
>75%<=85%	0.9		—		—		—		0.9
>85%	2.1		(0.4)		—		—		1.7
Total	$	11.1	$	(0.9)	$	—	$	—	$	10.2

	Three Months Ended September 30, 2022
	Beginning of Period		Current Period Provisions		Write-Offs		Recoveries		End of Period
	(in millions of dollars)
Loan-to-Value Ratio1
<=65%	$	2.3	$	0.2	$	—	$	—	$	2.5
>65<=75%	4.8		0.4		—		—		5.2
>75%<=85%	0.9		(0.2)		—		—		0.7
>85%	0.4		(0.1)		—		—		0.3
Total	$	8.4	$	0.3	$	—	$	—	$	8.7

	Nine Months Ended September 30, 2023
	Beginning of Year		Current Period Provisions		Write-Offs		Recoveries		End of Period
	(in millions of dollars)
Loan-to-Value Ratio1
<=65%	$	3.0	$	0.2	$	—	$	—	$	3.2
>65<=75%	4.7		(0.3)		—		—		4.4
>75%<=85%	1.1		(0.2)		—		—		0.9
>85%	0.5		1.2		—		—		1.7
Total	$	9.3	$	0.9	$	—	$	—	$	10.2

	Nine Months Ended September 30, 2022
	Beginning of Year		Current Period Provisions		Write-Offs		Recoveries		End of Period
	(in millions of dollars)
Loan-to-Value Ratio1
<=65%	$	2.6	$	(0.1)	$	—	$	—	$	2.5
>65<=75%	4.7		0.5		—		—		5.2
>75%<=85%	0.7		—		—		—		0.7
>85%	0.3		—		—		—		0.3
Total	$	8.3	$	0.4	$	—	$	—	$	8.7

1Loan-to-Value Ratio utilizes the most recent internal valuation of the property

46

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2023

Note 4 - Investments - Continued

For the three and nine months ended September 30, 2023, our estimate for expected credit losses was generally consistent between periods.

For the three and nine months ended September 30, 2023, we granted an other-than-insignificant payment delay for a commercial mortgage loan with an amortized cost of $14.2 million, which deferred the principal payment for 18 months. This modification represents less than one percent of the commercial mortgage loan portfolio balance.

At September 30, 2023 and December 31, 2022, we held no mortgage loans that were greater than 90 days past due regarding principal and/or interest payments.

We had no loan foreclosures for the three and nine months ended September 30, 2023 or 2022.

Other than our allowance for expected credit losses, we had no specifically identified impaired mortgage loans during the three and nine months ended September 30, 2023 or 2022, nor did we recognize any interest income on mortgage loans subsequent to impairment.

At September 30, 2023, we had commitments of $8.8 million to fund certain commercial mortgage loans. Consistent with how we determine the estimate of current expected credit losses for our funded mortgage loans each period, we estimate expected credit losses for loans that have not been funded but we are committed to fund at the end of each period. At September 30, 2023 and December 31, 2022, we had $0.1 million and a nominal amount, respectively, of expected credit losses related to unfunded commitments on our consolidated balance sheets.

Investment Real Estate

Our investment real estate balance was $65.7 million and $71.6 million at September 30, 2023 and December 31, 2022, respectively, and the associated accumulated depreciation was $126.0 million and $122.1 million at September 30, 2023 and December 31, 2022, respectively. For the three and nine months ended September 30, 2023, we recognized a $3.0 million impairment related to certain of our real estate held for investment. We did not recognize any impairments related to our real estate during the three and nine months ended September 30, 2022.

Our held for sale real estate balance was $40.9 million at both September 30, 2023 and December 31, 2022 and the associated accumulated depreciation was $54.2 million at both September 30, 2023 and December 31, 2022.

In the first quarter of 2022, we reclassified property previously held for the production of income to property held for sale. The carrying value of the property was $40.1 million as of both September 30, 2023 and December 31, 2022 and is primarily recorded within our Corporate segment. The estimated fair value less costs to sell is above the carrying value of the property and we expect to close the sale of the property within the next twelve months.

During the third quarter of 2022, we reclassified one additional property previously held for the production of income to property held for sale. The property had a carrying value of $0.8 million as of both September 30, 2023 and December 31, 2022 and is primarily recorded within our Corporate segment. The estimated fair value less cost to sell is above the carrying value and we expect to close the sale within the next twelve months.

Transfers of Financial Assets

To manage our cash position more efficiently, we may enter into repurchase agreements with unaffiliated financial institutions. We generally use repurchase agreements as a means to finance the purchase of invested assets or for short-term general business purposes until projected cash flows become available from our operations or existing investments. Our repurchase agreements are typically outstanding for less than 30 days. We post collateral through our repurchase agreement transactions whereby the counterparty commits to purchase securities with the agreement to resell them to us at a later, specified date. The fair value of collateral posted is generally 102 percent of the cash received.

Our investment policy also permits us to lend fixed maturity securities to unaffiliated financial institutions in short-term securities lending agreements. These agreements increase our investment income with minimal risk. Our securities lending

47

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2023

Note 4 - Investments - Continued

policy requires that a minimum of 102 percent of the fair value of the securities loaned be maintained as collateral. We may receive cash and/or securities as collateral under these agreements. Cash received as collateral is typically reinvested in short-term investments. If securities are received as collateral, we are not permitted to sell or re-post them.

As of September 30, 2023, the carrying amount of fixed maturity securities loaned to third parties under our securities lending program was $68.3 million, for which we received collateral in the form of cash and securities of $59.6 million and $12.3 million, respectively. As of December 31, 2022, the carrying amount of fixed maturity securities loaned to third parties under our securities lending program was $152.4 million, for which we received collateral in the form of cash and securities of $88.5 million and $69.8 million, respectively. We had no outstanding repurchase agreements at September 30, 2023 or December 31, 2022. The remaining contractual maturities of our securities lending agreements disaggregated by class of assets pledged are as follows:

	September 30, 2023		December 31, 2022
	Overnight and Continuous
	(in millions of dollars)
Borrowings
United States Government and Government Agencies and Authorities	$	—	$	0.3
States, Municipalities, and Political Subdivisions	—		—
Public Utilities	2.2		6.3
All Other Corporate Bonds	57.4		81.9
Total Borrowings	$	59.6	$	88.5
Gross Amount of Recognized Liability for Securities Lending Transactions	59.6		88.5
Amounts Related to Agreements Not Included in Offsetting Disclosure Contained Herein	$	—	$	—

Certain of our U.S. insurance subsidiaries are members of regional FHLBs. Membership, which requires that we purchase a minimum amount of FHLB common stock on which we receive dividends, provides access to low-cost funding. Advances received from the FHLB are used for the purchase of fixed maturity securities. Additional common stock purchases may be required, based on the amount of funds we borrow from the FHLBs. The carrying value of common stock owned, collateral posted, and advances received are as follows:

	September 30, 2023		December 31, 2022
	(in millions of dollars)
Carrying Value of FHLB Common Stock	$	16.3	$	17.1
Advances from FHLB	76.9		99.1
Carrying Value of Collateral Posted to FHLB
Fixed Maturity Securities	$	536.4	$	527.1
Commercial Mortgage Loans	756.8		801.9
Total Carrying Value of Collateral Posted to FHLB	$	1,293.2	$	1,329.0

Offsetting of Financial Instruments

We enter into master netting agreements with each of our derivative's counterparties. These agreements provide for conditional rights of set-off upon the occurrence of an early termination event. An early termination event is considered a default, and it allows the non-defaulting party to offset its contracts in a loss position against any gain positions or payments due to the defaulting party. Under our agreements, default type events are defined as failure to pay or deliver as contractually agreed, misrepresentation, bankruptcy, or merger without assumption. See Note 5 for further discussion of collateral related to our derivative contracts.

48

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2023

Note 4 - Investments - Continued

We have securities lending agreements with unaffiliated financial institutions that post collateral to us in return for the use of our fixed maturity securities. A right of set-off exists that allows us to keep and apply collateral received in the event of default by the counterparty. Default within a securities lending agreement would typically occur if the counterparty failed to return the securities borrowed from us as contractually agreed. In addition, if we default by not returning collateral received, the counterparty has a right of set-off against our securities or any other amounts due to us.

Shown below are our financial instruments that either meet the accounting requirements that allow them to be offset in our balance sheets or that are subject to an enforceable master netting arrangement or similar agreement. Our accounting policy is to not offset these financial instruments in our balance sheets. Net amounts disclosed below have been reduced by the amount of collateral pledged to or received from our counterparties.

	September 30, 2023
	Gross Amount						Gross Amount Not
	of Recognized		Gross Amount		Net Amount		Offset in Balance Sheet
	Financial		Offset in		Presented in		Financial		Cash		Net
	Instruments		Balance Sheet		Balance Sheet		Instruments		Collateral		Amount
	(in millions of dollars)
Financial Assets:
Derivatives	$	74.8	$	—	$	74.8	$	(74.7)	$	—	$	0.1
Securities Lending	68.3		—		68.3		(8.7)		(59.6)		—
Total	$	143.1	$	—	$	143.1	$	(83.4)	$	(59.6)	$	0.1
Financial Liabilities:
Derivatives	$	212.7	$	—	$	212.7	$	(212.6)	$	—	$	0.1
Securities Lending	59.6		—		59.6		(59.6)		—		—
Total	$	272.3	$	—	$	272.3	$	(272.2)	$	—	$	0.1

	December 31, 2022
	Gross Amount						Gross Amount Not
	of Recognized		Gross Amount		Net Amount		Offset in Balance Sheet
	Financial		Offset in		Presented in		Financial		Cash		Net
	Instruments		Balance Sheet		Balance Sheet		Instruments		Collateral		Amount
	(in millions of dollars)
Financial Assets:
Derivatives	$	89.1	$	—	$	89.1	$	(38.0)	$	(49.4)	$	1.7
Securities Lending	152.4		—		152.4		(63.9)		(88.5)		—
Total	$	241.5	$	—	$	241.5	$	(101.9)	$	(137.9)	$	1.7
Financial Liabilities:
Derivatives	$	74.0	$	—	$	74.0	$	(73.2)	$	—	$	0.8
Securities Lending	88.5		—		88.5		(88.5)		—		—
Total	$	162.5	$	—	$	162.5	$	(161.7)	$	—	$	0.8

49

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2023

Note 4 - Investments - Continued

Net Investment Income

Net investment income reported in our consolidated statements of income is presented below.

	Three Months Ended September 30				Nine Months Ended September 30
	2023		2022		2023		2022
	(in millions of dollars)
Fixed Maturity Securities	$	457.9	$	456.7	$	1,383.7	$	1,379.9
Derivatives	11.6		14.9		34.5		45.1
Mortgage Loans	22.9		24.7		69.8		77.6
Policy Loans	5.4		5.1		15.6		14.8
Other Long-term Investments
Perpetual Preferred Securities1	0.4		1.1		2.2		3.2
Private Equity Partnerships2	22.6		12.6		56.7		98.6
Other	2.6		3.6		7.1		7.4
Short-term Investments	19.1		5.9		49.4		9.2
Gross Investment Income	542.5		524.6		1,619.0		1,635.8
Less Investment Expenses	13.5		10.0		44.0		29.1
Less Investment Income on Participation Fund Account Assets	3.0		3.0		9.1		8.9
Net Investment Income	$	526.0	$	511.6	$	1,565.9	$	1,597.8

1The net unrealized gain (loss) recognized in net investment income for the three and nine months ended September 30, 2023 related to perpetual preferred securities still held at September 30, 2023 was $(0.4) million and $0.1 million, respectively. The net unrealized gain (loss) recognized in net investment income for the three and nine months ended September 30, 2022 related to perpetual preferred securities still held at September 30, 2022 was $0.5 million and $1.5 million, respectively.

2The net unrealized gain recognized in net investment income for the three and nine months ended September 30, 2023 related to private equity partnerships still held at September 30, 2023 was $29.7 million and $72.6 million, respectively, reduced by net management fees and partnership expenses of $(7.1) million and $(15.9) million, respectively. The net unrealized gain recognized in net investment income for the three and nine months ended September 30, 2022 related to private equity partnerships still held at September 30, 2022 was $14.3 million and $106.8 million, respectively, reduced by net management fees and partnership expenses of $(1.8) million and $(8.3) million, respectively. See Note 3 for further discussion of private equity partnerships.

50

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2023

Note 4 - Investments - Continued

Investment Gain and Loss

Investment gains and losses are as follows:

	Three Months Ended September 30				Nine Months Ended September 30
	2023		2022		2023		2022
	(in millions of dollars)
Fixed Maturity Securities
Gross Gains on Sales	$	0.4	$	—	$	3.7	$	0.8
Gross Losses on Sales	(37.4)		(13.4)		(50.7)		(26.4)
Credit Losses	—		(0.5)		—		(4.6)
Mortgage Loans and Other Invested Assets
Gross Gains on Sales	—		—		6.0		1.4
Gross Losses on Sales	(0.9)		—		(1.0)		—
Impairment Loss	(3.0)		—		(3.0)		—
Change in Allowance for Credit Losses	0.9		(0.4)		(0.9)		(0.3)
Embedded Derivative in Modified Coinsurance Arrangement	9.2		14.9		14.7		10.7
All Other Derivatives	2.0		(0.9)		2.0		4.6
Foreign Currency Transactions	(2.2)		(4.1)		(0.8)		(8.5)
Net Investment Gain (Loss)	$	(31.0)	$	(4.4)	$	(30.0)	$	(22.3)

Note 5 - Derivative Financial Instruments

Purpose of Derivatives

We are exposed to certain risks relating to our ongoing business operations. The primary risks managed by using derivative instruments are interest rate risk, risk related to matching duration for our assets and liabilities, foreign currency risk, credit risk, and equity risk. Historically, we have utilized current and forward interest rate swaps, current and forward currency swaps, forward benchmark interest rate locks, currency forward contracts, forward contracts on specific fixed income securities, credit default swaps, and total return swaps. Transactions hedging interest rate risk are primarily associated with our individual and group long-term care and individual and group disability products. All other product portfolios are periodically reviewed to determine if hedging strategies would be appropriate for risk management purposes. We do not use derivative financial instruments for speculative purposes.

Derivatives designated as cash flow hedges and used to reduce our exposure to interest rate and duration risk are as follows:

•Interest rate swaps were used to hedge interest rate risks and to improve the matching of assets and liabilities. An interest rate swap is an agreement in which we agree with other parties to exchange, at specified intervals, the difference between fixed rate and variable rate interest amounts. We used interest rate swaps to hedge the anticipated purchase of fixed maturity securities thereby protecting us from the potential adverse impact of declining interest rates on the associated policy reserves. We also used interest rate swaps to hedge the potential adverse impact of rising interest rates in anticipation of issuing fixed rate long-term debt.

•Forward benchmark interest rate locks are used to minimize interest rate risk associated with the anticipated purchase or disposal of fixed maturity securities or the anticipated issuance of fixed rate long-term debt. A forward benchmark interest rate lock is a derivative contract without an initial investment where we and the counterparty agree to purchase or sell a specific benchmark interest rate fixed maturity bond at a future date at a predetermined price or yield.

51

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2023

Note 5 - Derivative Financial Instruments - Continued

Derivatives designated as either cash flow or fair value hedges and used to reduce our exposure to foreign currency risk are as follows:

•Foreign currency interest rate swaps are used to hedge the currency risk of certain foreign currency-denominated fixed maturity securities owned for portfolio diversification. Under these swap agreements, we agree to pay, at specified intervals, fixed rate foreign currency-denominated principal and interest payments in exchange for fixed rate payments in the functional currency of the operating segment.

Derivatives not designated as hedging instruments and used to reduce our exposure to foreign currency risk, credit losses on securities owned and volatility of the underlying deferred assets in our non-qualified defined contribution plan are as follows:

•Foreign currency interest rate swaps previously designated as hedges were used to hedge the currency risk of certain foreign currency-denominated fixed maturity securities owned for portfolio diversification. These derivatives were effective hedges prior to novation to a new counterparty. In conjunction with the novation, these derivatives were de-designated as hedges. We agree to pay, at specified intervals, fixed rate foreign currency-denominated principal and interest payments in exchange for fixed rate payments in the functional currency of the operating segment. We hold offsetting swaps wherein we agree to pay fixed rate principal and interest payments in the functional currency of the operating segment in exchange for fixed rate foreign currency-denominated payments.

•Credit default swaps were used as economic hedges against credit risk but do not qualify for hedge accounting. A credit default swap is an agreement in which we agree with another party to pay, at specified intervals, a fixed-rate fee in exchange for insurance against a credit event on a specific investment. If a defined credit event occurred, our counterparty could have either paid us a net cash settlement, or we could have surrendered the specific investment to them in exchange for cash equal to the full notional amount of the swap. Credit events typically include events such as bankruptcy, failure to pay, or certain types of debt restructuring.

•Foreign currency forward contracts are used to minimize foreign currency risk. A foreign currency forward is a derivative without an initial investment where we and the counterparty agree to exchange a specific amount of currencies, at a specific exchange rate, on a specific date. We use these forward contracts to hedge the currency risk arising from foreign-currency denominated investments.

•Total Return Swaps are used to economically hedge a portion of the liability related to our non-qualified defined contribution plan. A total return swap is an agreement in which we pay a floating rate of interest to the counterparty and receive the total return on a portfolio of mutual funds. These swaps are cash settled on the last day of every month and the notional is re-established each month based on periodic distributions from and contributions to the plan assets.

52

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2023

Note 5 - Derivative Financial Instruments - Continued

Derivative Risks

The basic types of risks associated with derivatives are market risk (that the value of the derivative will be adversely impacted by changes in the market, primarily the change in interest and exchange rates) and credit risk (that the counterparty will not perform according to the terms of the contract). The market risk of the derivatives should generally offset the market risk associated with the hedged financial instrument or liability. To help limit the credit exposure of the derivatives, we enter into master netting agreements with our counterparties whereby contracts in a gain position can be offset against contracts in a loss position. We also typically enter into bilateral, cross-collateralization agreements with our counterparties to help limit the credit exposure of the derivatives. These agreements require the counterparty in a loss position to submit acceptable collateral with the other counterparty in the event the net loss position meets or exceeds an agreed upon amount. Credit exposure on derivatives is limited to the value of those contracts in a net gain position, including accrued interest receivable less collateral held. Our credit exposure on derivatives was a nominal amount at September 30, 2023. As of December 31, 2022, we had $1.7 million credit exposure on derivatives. The table below summarizes the nature and amount of collateral received from and posted to our derivative counterparties.

	September 30, 2023		December 31, 2022
	(in millions of dollars)
Carrying Value of Collateral Received from Counterparties
Cash	$	—	$	49.4
Fixed Maturity Securities	17.8		—
	$	17.8	$	49.4
Carrying Value of Collateral Posted to Counterparties
Cash	$	4.6	$	5.1
Fixed Maturity Securities	166.0		39.6
	$	170.6	$	44.7

See Note 4 for further discussion of our master netting agreements.

The majority of our derivative instruments contain provisions that require us to maintain specified issuer credit ratings and financial strength ratings. Should our ratings fall below these specified levels, we would be in violation of the provisions, and our derivatives counterparties could terminate our contracts and request immediate payment. The aggregate fair value of all derivative instruments with credit risk-related contingent features that were in a liability position was $212.7 million and $74.0 million at September 30, 2023 and December 31, 2022, respectively.

Cash Flow Hedges

As of September 30, 2023 and December 31, 2022, we had $156.4 million and $168.9 million, respectively, notional amount of receive fixed, pay fixed, open current and forward foreign currency interest rate swaps to hedge fixed income foreign currency-denominated securities.

As of September 30, 2023 and December 31, 2022, we had $1,290.0 million and $764.0 million, respectively, notional amount of forward benchmark interest rate locks to hedge the anticipated purchase of fixed maturity securities.

As of September 30, 2023, we expect to amortize approximately $21.4 million of net deferred gains on derivative instruments during the next twelve months. This amount will be reclassified from AOCI into earnings and reported on the same income statement line item as the hedged item. The income statement line items that will be affected by this amortization are net investment income and interest and debt expense. Additional amounts that may be reclassified from AOCI into earnings to offset the earnings impact of foreign currency translation of hedged items are not estimable.

As of September 30, 2023, we are hedging the variability of future cash flows associated with forecasted transactions through the year 2063.

53

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2023

Note 5 - Derivative Financial Instruments - Continued

Fair Value Hedges

As of September 30, 2023 and December 31, 2022, we had $603.6 million and $557.8 million, respectively, notional amount of receive fixed, pay fixed, open current and forward foreign currency interest rate swaps to hedge fixed income foreign currency-denominated securities.

The following table summarizes the carrying amount of hedged assets and the related cumulative basis adjustments related to our fair value hedges:

	Carrying Amount of Hedged Assets				Cumulative Amount of Fair Value Hedging Adjustment Included in the Carrying Amount of the Hedged Assets
	September 30, 2023		December 31, 2022		September 30, 2023		December 31, 2022
	(in millions of dollars)
Fixed maturity securities:
Receive fixed functional currency interest, pay fixed foreign currency interest	$	429.0	$	394.4	$	(33.5)	$	(24.8)

For the three and nine months ended September 30, 2023, $(19.4) million and $(26.6) million, respectively, of the derivative instruments' loss was excluded from the assessment of hedge effectiveness. For the three and nine months ended September 30, 2022, $0.2 million and $13.9 million, respectively, of the derivative instruments' gain was excluded from the assessment of hedge effectiveness. There were no instances wherein we discontinued fair value hedge accounting due to a hedged firm commitment no longer qualifying as a fair value hedge.

Derivatives not Designated as Hedging Instruments

At both September 30, 2023 and December 31, 2022, we held $132.0 million notional amount of receive fixed, pay fixed, foreign currency interest rate swaps. These derivatives are not designated as hedges, and as such, changes in fair value related to these derivatives are reported in earnings as a component of net investment gain or loss.

As of September 30, 2023 and December 31, 2022, we held $53.2 million and $54.3 million, respectively, notional amount of foreign currency forwards to mitigate the foreign currency risk associated with specific securities owned. These derivatives are not designated as hedges, and as such, changes in fair value related to these derivatives are reported in earnings as a component of net investment gain or loss.

As of September 30, 2023 and December 31, 2022, we held $89.0 million and $76.9 million, respectively, notional amount of total return swaps to mitigate the volatility associated with changes in the fair value of the underlying notional assets in our non-qualified defined contribution plan. This derivative is an economic hedge not designated as a hedging instrument, and changes in fair value are reported as a component of other expenses in our income statement.

We have an embedded derivative in a modified coinsurance arrangement for which we include in our net investment gains and losses, a calculation intended to estimate the value of the option of our reinsurance counterparty to cancel the reinsurance contract with us. However, neither party can unilaterally terminate the reinsurance agreement except in extreme circumstances resulting from regulatory supervision, delinquency proceedings, or other direct regulatory action. Cash settlements or collateral related to this embedded derivative are not required at any time during the reinsurance contract or at termination of the reinsurance contract. There are no credit-related counterparty triggers, and any accumulated embedded derivative gain or loss reduces to zero over time as the reinsured business winds down.

54

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2023

Note 5 - Derivative Financial Instruments - Continued

Locations and Amounts of Derivative Financial Instruments

The following tables summarize the notional amounts and fair values of derivative financial instruments, as reported in our consolidated balance sheets. Derivative assets are included in other long-term investments, while derivative liabilities are included in other liabilities within our consolidated balance sheets. The notional amounts represent the basis upon which our counterparty pay and receive amounts are calculated.

	September 30, 2023
			Derivative Assets		Derivative Liabilities
	Notional Amount		Fair Value		Fair Value
	(in millions of dollars)
Designated as Hedging Instruments
Cash Flow Hedges
Forward Benchmark Interest Rate Locks	$	1,290.0	$	—	$	184.1
Foreign Currency Interest Rate Swaps	156.4		16.7		2.5
Total Cash Flow Hedges	1,446.4		16.7		186.6
Fair Value Hedges
Foreign Currency Interest Rate Swaps	603.6		53.1		9.7
Total Designated as Hedging Instruments	$	2,050.0	$	69.8	$	196.3
Not Designated as Hedging Instruments
Foreign Currency Forwards	$	53.2	$	5.0	$	—
Foreign Currency Interest Rate Swaps	132.0		—		16.4
Total Return Swaps	89.0		—		—
Embedded Derivative in Modified Coinsurance Arrangement	—		0.9		—
Total Not Designated as Hedging Instruments	$	274.2	$	5.9	$	16.4
Total Derivatives	$	2,324.2	$	75.7	$	212.7

55

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2023

Note 5 - Derivative Financial Instruments - Continued

	December 31, 2022
			Derivative Assets		Derivative Liabilities
	Notional Amount		Fair Value		Fair Value
	(in millions of dollars)
Designated as Hedging Instruments
Cash Flow Hedges
Forward Benchmark Interest Rate Locks	$	764.0	$	1.6	$	48.4
Foreign Currency Interest Rate Swaps	168.9		17.5		3.1
Total Cash Flow Hedges	932.9		19.1		51.5
Fair Value Hedges
Foreign Currency Interest Rate Swaps	557.8		66.0		5.4
Total Designated as Hedging Instruments	$	1,490.7	$	85.1	$	56.9
Not Designated as Hedging Instruments
Foreign Currency Forwards	$	54.3	$	4.0	$	0.1
Foreign Currency Interest Rate Swaps	132.0		—		17.0
Total Return Swaps	76.9		—		—
Embedded Derivative in Modified Coinsurance Arrangement	—		—		13.9
Total Not Designated as Hedging Instruments	$	263.2	$	4.0	$	31.0
Total Derivatives	$	1,753.9	$	89.1	$	87.9

56

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2023

Note 5 - Derivative Financial Instruments - Continued

The following tables summarize the location of gains and losses of derivative financial instruments designated as hedging instruments, as reported in our consolidated statements of income.

	Three Months Ended September 30
	2023						2022
	Net Investment Income		Net Investment Gain (Loss)		Interest and Debt Expense		Net Investment Income		Net Investment Gain (Loss)		Interest and Debt Expense
	(in millions of dollars)
Total Income and Expense Presented in the Consolidated Statements of Income of Which Hedged Items are Recorded	$	526.0	$	(31.0)	$	48.6	$	511.6	$	(4.4)	$	47.0
Gain (Loss) on Cash Flow Hedging Relationships
Interest Rate Swaps:
Hedged items	49.7		—		0.7		50.2		—		0.7
Derivatives Designated as Hedging Instruments	8.3		—		—		14.1		—		—
Foreign Exchange Contracts:
Hedged items	2.3		(0.1)		—		2.7		(0.5)		—
Derivatives Designated as Hedging Instruments	0.4		—		—		(1.5)		—		—
Forward Benchmark Interest Rate Locks:
Hedged items	3.9		—		—		0.2		—		—
Derivatives Designated as Hedging Instruments	(0.1)		—		—		—		—		—
Gain (Loss) on Fair Value Hedging Relationships
Foreign Exchange Contracts
Hedged items	3.9		(15.2)		—		2.9		(29.6)		—
Derivatives Designated as Hedging Instruments	3.1		15.2		—		1.0		29.6		—

57

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2023

Note 5 - Derivative Financial Instruments - Continued

	Nine Months Ended September 30
	2023						2022
	Net Investment Income		Net Investment Gain (Loss)		Interest and Debt Expense		Net Investment Income		Net Investment Gain (Loss)		Interest and Debt Expense
	(in millions of dollars)
Total Income and Expense Presented in the Consolidated Statements of Income of Which Hedged Items are Recorded	$	1,565.9	$	(30.0)	$	145.6	$	1,597.8	$	(22.3)	$	141.3
Gain (Loss) on Cash Flow Hedging Relationships
Interest Rate Swaps:
Hedged items	148.2		0.8		2.2		150.9		—		2.1
Derivatives Designated as Hedging Instruments	27.7		—		—		40.5		—		—
Foreign Exchange Contracts:
Hedged items	7.3		(0.1)		—		8.3		(0.5)		—
Derivatives Designated as Hedging Instruments	0.6		0.1		—		(0.9)		—		—
Forward Benchmark Interest Rate Locks:
Hedged items	7.7		—		—		0.2		—		—
Derivatives Designated as Hedging Instruments	(0.1)		—		—		—		—		—
Gain (Loss) on Fair Value Hedging Relationships
Foreign Exchange Contracts
Hedged items	10.3		(8.7)		—		8.7		(62.5)		—
Derivatives Designated as Hedging Instruments	6.7		8.7		—		5.1		62.5		—

The following table summarizes the location of gains and losses of derivative financial instruments designated as cash flow hedging instruments, as reported in our consolidated statements of comprehensive income (loss).

	Three Months Ended September 30				Nine Months Ended September 30
	2023		2022		2023		2022
	(in millions of dollars)
Gain (Loss) Recognized in Other Comprehensive Income (Loss) on Derivatives
Forwards	$	(158.9)	$	(34.3)	$	(159.7)	$	(32.0)
Foreign Exchange Contracts	3.4		7.1		0.7		11.4
Total	$	(155.5)	$	(27.2)	$	(159.0)	$	(20.6)

58

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2023

Note 5 - Derivative Financial Instruments - Continued

The following table summarizes the location of gains and losses on our derivatives not designated as hedging instruments, as reported in our consolidated statements of income.

	Three Months Ended September 30				Nine Months Ended September 30
	2023		2022		2023		2022
	(in millions of dollars)
Net Investment Gain (Loss)
Foreign Exchange Contracts	$	2.0	$	(0.9)	$	2.0	$	4.6
Embedded Derivative in Modified Coinsurance Arrangement	9.2		14.9		14.7		10.7
Total	$	11.2	$	14.0	$	16.7	$	15.3
Other Expenses
(Gain) Loss on Total Return Swaps	$	4.1	$	4.3	$	(4.7)	$	23.0

59

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2023

Note 6 - Accumulated Other Comprehensive Loss

Components of our accumulated other comprehensive loss, after tax, and related changes are as follows:

	Net Unrealized Gain (Loss) on Securities		Effect of Change in Discount Rate Assumptions on the LFPB1		Net Gain (Loss) on Hedges		Foreign Currency Translation Adjustment		Unrecognized Pension and Postretirement Benefit Costs		Total
	(in millions of dollars)
Balance at June 30, 2023	$	(2,762.6)	$	0.1	$	(33.3)	$	(327.1)	$	(334.7)	$	(3,457.6)
Other Comprehensive Income (Loss) Before Reclassifications	(1,215.1)		1,688.4		(137.9)		(55.1)		2.5		282.8
Amounts Reclassified from Accumulated Other Comprehensive Income or Loss	29.3		—		(6.5)		—		1.4		24.2
Net Other Comprehensive Income (Loss)	(1,185.8)		1,688.4		(144.4)		(55.1)		3.9		307.0
Balance at September 30, 2023	$	(3,948.4)	$	1,688.5	$	(177.7)	$	(382.2)	$	(330.8)	$	(3,150.6)
Balance at June 30, 2022	$	(1,560.4)	$	(1,541.2)	$	46.4	$	(367.5)	$	(386.8)	$	(3,809.5)
Other Comprehensive Income (Loss) Before Reclassifications	(1,937.0)		2,222.9		(23.0)		(71.5)		2.8		194.2
Amounts Reclassified from Accumulated Other Comprehensive Income or Loss	11.1		—		(9.9)		—		3.1		4.3
Net Other Comprehensive Income (Loss)	(1,925.9)		2,222.9		(32.9)		(71.5)		5.9		198.5
Balance at September 30, 2022	$	(3,486.3)	$	681.7	$	13.5	$	(439.0)	$	(380.9)	$	(3,611.0)
Balance at December 31, 2022	$	(3,028.4)	$	313.9	$	(9.6)	$	(390.1)	$	(334.1)	$	(3,448.3)
Other Comprehensive Income (Loss) Before Reclassifications	(957.2)		1,374.6		(146.4)		7.9		(0.9)		278.0
Amounts Reclassified from Accumulated Other Comprehensive Income or Loss	37.2		—		(21.7)		—		4.2		19.7
Net Other Comprehensive Income (Loss)	(920.0)		1,374.6		(168.1)		7.9		3.3		297.7
Balance at September 30, 2023	$	(3,948.4)	$	1,688.5	$	(177.7)	$	(382.2)	$	(330.8)	$	(3,150.6)
Balance at December 31, 2021	$	4,014.4	$	(8,570.7)	$	61.8	$	(274.1)	$	(396.0)	$	(5,164.6)
Other Comprehensive Income (Loss) Before Reclassifications	(7,524.6)		9,252.4		(17.1)		(164.9)		5.9		1,551.7
Amounts Reclassified from Accumulated Other Comprehensive Income or Loss	23.9		—		(31.2)		—		9.2		1.9
Net Other Comprehensive Income (Loss)	(7,500.7)		9,252.4		(48.3)		(164.9)		15.1		1,553.6
Balance at September 30, 2022	$	(3,486.3)	$	681.7	$	13.5	$	(439.0)	$	(380.9)	$	(3,611.0)
1Liability for Future Policy Benefits

60

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2023

Note 6 - Accumulated Other Comprehensive Loss - Continued

Amounts reclassified from accumulated other comprehensive loss were recognized in our consolidated statements of income as follows:

	Three Months Ended September 30				Nine Months Ended September 30
	2023		2022		2023		2022
	(in millions of dollars)
Net Unrealized Loss on Securities
Net Investment Loss
Net Loss on Sales of Fixed Maturity Securities	$	(37.0)	$	(13.4)	$	(47.0)	$	(25.6)
Credit Losses on Fixed Maturity Securities	—		(0.5)		—		(4.6)
	(37.0)		(13.9)		(47.0)		(30.2)
Income Tax Benefit	(7.7)		(2.8)		(9.8)		(6.3)
Total	$	(29.3)	$	(11.1)	$	(37.2)	$	(23.9)
Net Gain (Loss) on Hedges
Net Investment Income
Gain on Interest Rate Swaps and Forwards	$	8.3	$	14.1	$	27.6	$	40.5
Loss on Foreign Exchange Contracts	(0.1)		(1.5)		(0.2)		(1.0)
Net Investment Gain
Gain on Foreign Exchange Contracts	—		—		0.1		—
	8.2		12.6		27.5		39.5
Income Tax Expense	1.7		2.7		5.8		8.3
Total	$	6.5	$	9.9	$	21.7	$	31.2
Unrecognized Pension and Postretirement Benefit Costs
Other Expenses
Amortization of Net Actuarial Loss	$	(1.8)	$	(4.0)	$	(5.4)	$	(11.8)
Amortization of Prior Service Credit	—		0.1		0.1		0.2
	(1.8)		(3.9)		(5.3)		(11.6)
Income Tax Benefit	(0.4)		(0.8)		(1.1)		(2.4)
Total	$	(1.4)	$	(3.1)	$	(4.2)	$	(9.2)

61

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2023

Note 7 - Liability for Future Policy Benefits

Liabilities for future policy benefits represent the cost of claims that we estimate we will eventually pay to our policyholders which includes policy liabilities for claims not yet incurred and for claims that have been incurred or are estimated to have been incurred but not yet reported to us. Liabilities for future policy benefits also include the related expenses for our non interest-sensitive life and accident and health products. The liability for future policy benefits is calculated based on the present value of the estimated future policy benefits less the present value of estimated future net premiums collected. Net premiums represent the portion of the gross premium required to provide for all benefits and expenses, excluding acquisition costs or any costs that are required to be charged to expense as incurred. In calculating the liability for future policy benefits, our long-duration contracts are grouped into cohorts by product type and contract issue year.

The calculation of the liability for future policy benefits involves numerous assumptions including assumptions related to discount rate, lapses, mortality, and morbidity. The discount rate assumptions were initially set based on the expected investment yield of the assets supporting the reserves at the transition date of ASU 2018-12, which was January 1, 2021, for policies originally issued on or before the transition date. The discount rate assumptions for new cohorts established after the transition date, are initially set based on the policy issuance date or policy renewal date, and are based on an upper-medium grade fixed-income instrument, which is generally equivalent to a single-A interest rate matched to the duration of our insurance liabilities. As cohorts are grouped by product type and issue year, a weighted average discount rate is utilized as policies are issued or renewed throughout the year. We utilize a reference portfolio of fixed-income instruments that have been A-rated by one of the major credit rating agencies. For products with liability cash flows that exceed the duration of observable single-A fixed income instruments, we use the last market observable yield and use extrapolation approaches to determine yield assumptions for durations beyond the last market observable duration. For the discount rate assumptions for products in our Unum International segment, we utilize observable market data in the local debt markets in the UK and Poland.

The initial, also referred to as the original, discount rate assumptions established for each cohort are used to determine interest accretion which is reported as a component of policy benefits on the statements of income. After policy issuance or policy renewal, the discount rate assumptions are updated quarterly and used to update the liability at each reporting date to the current discount rate, with the corresponding change reflected as the change in the effect of discount rate assumptions on the liability for future policy benefits, net of reinsurance, on the statement of changes in other comprehensive income (loss). The weighted average current discount rate was 5.6 percent at September 30, 2023 compared to 5.0 percent at December 31, 2022. The weighted average current discount rate was 5.2 percent at September 30, 2022 compared to 2.5 percent at December 31, 2021. The increase in weighted average current discount rate during both periods is due primarily to an increase in U.S. Treasury rates.

Policyholder lapse and mortality assumptions reflect the probability that an insureds’ coverage is discontinued due to lapsation or death of the insured. For our life insurance products, mortality assumptions also reflect the probability that a benefit payment occurs. Policyholder lapse and mortality assumptions are based on our actual historical experience adjusted for future expectations. Claim incidence and claim resolution rate assumptions related to morbidity and mortality are based on actual experience or industry standards adjusted as appropriate to reflect our actual experience and future expectations. The claim incidence rate assumption is the rate at which new claims are submitted and the development of this assumption may involve many factors, including the age of the insured, the insured's occupation or industry, the benefit plan design, and certain external factors such as consumer confidence and levels of unemployment. The claim resolution rate assumption is the probability that a claim will close due to recovery or death of the insured and is used to estimate how long benefits will be paid on an open claim. Certain product lines may utilize additional assumptions in calculating the liability for future policy benefits in addition to those listed above such as premium rate increases for long-term care, benefit offsets for long-term disability, and claim costs for voluntary benefits. Claim costs capture the combined effect of the incidence rate, the expected level of benefit to be paid, and the claim resolution rate.

Cash flow assumptions are reviewed and updated, as needed, at least annually. Assumptions may be updated more frequently if necessary based on trending experience and future expectations. On a quarterly basis, cohort level cash flow measures are updated based on the emergence of actual experience. The updated cash flows are used to determine the updated net premiums and the net premium ratio, which is the present value of benefits and related expenses divided by the present value of gross premiums. The updated net premium ratio is used to calculate the updated liability for future policy benefits as of the beginning of the year, at the original discount rate. The change in the liability for future policy benefits, at the original discount rate, as of the beginning of the period, resulting from changes in cash flow assumptions and resulting from the emergence of actual experience from expected experience, is reflected as the policy benefits - remeasurement loss (gain) in the consolidated

62

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2023

Note 7 - Liability for Future Policy Benefits - Continued

statements of income. The impact of all other changes in the liability for future policy benefits are reflected as policy benefits in the consolidated statements of income.

For most products, a net premium methodology is applied to each cohort to estimate the liability for claims not yet incurred in which discounted gross benefits are compared to discounted gross premiums. In this methodology, actual experience to date is combined with projected future cash flows to determine a net premium ratio for each cohort. The future cash flows include the costs of future expected claims as well as future cash flows on claims that have already been incurred. The net premium ratio is then used to estimate the liability for future policy benefits. The liability for future policy benefits represents the present value of future claims and associated expenses less the present value of future net premiums, which is derived by multiplying the present value of future gross premium by the net premium ratio.

For our group products in the Unum US and Unum International segments, we evaluate the liability for future policy benefits required for active policies in comparison to incurred claims. Given the term nature of the products, their renewal features, and level funding nature of the premium for these products, we have determined that the liability value is generally zero for policies that are not on claim. In this situation, our liability for future policy benefit values are limited to the liability associated with claims incurred as of the valuation date.

Multiple estimation methods exist to establish liabilities for the incurred claim component of future policy benefits. Available reserving methods utilized to calculate these liabilities include the tabular reserve method, the paid loss development method, the incurred loss development method, the count and severity method, and the expected claim cost method. No single method is better than the others in all situations and for all product lines. The estimation methods we have chosen are those that we believe produce the most accurate and reliable liability.

We use a tabular reserve methodology on reported claims for our Unum US group long-term disability and individual disability claims as well as for our Closed Block long-term care claims. Under the tabular reserve methodology, the liability for reported claims is based on certain characteristics of the actual reported claimants and their related policy provisions, such as age, length of time disabled, and medical diagnosis, as well as assumptions regarding claim duration, discount rate, and policy benefit offsets. We believe the tabular reserve method is the most accurate to calculate long-term liabilities and allows us to use the most available known facts about each claim. Incurred, but not reported (IBNR) liabilities for future policy benefits for our longer-term products are calculated using the count and severity method using historical patterns of the claims to be reported and the associated claim costs. For Unum US group short-term disability products, an estimate of the value of future payments to be made on claims already submitted, as well as on IBNR claims, is determined in aggregate using a paid loss development method rather than on the individual claimant basis that we use for reported claims on longer-term products. The average length of time between the event triggering a claim under a policy and the final resolution of those claims is much shorter for these products and results in less estimation variability.

Liabilities for claims for Unum US group life and accidental death and dismemberment products are related primarily to death claims reported but not yet paid, IBNR death claims, and a liability for waiver of premium benefits in the event the policyholder becomes disabled. The death claim liability is based on the actual face amount to be paid, the IBNR liability is calculated using the count and severity method based on historical patterns of the claims, and the waiver of premium benefits liability is calculated using the tabular reserve methodology.

Liabilities for claims related to the group and individual dental and vision products reported in our Unum US and Colonial Life segments have a short claim payout period. As a result, the liabilities, which primarily represent IBNR and a small amount of claims pending payment, are calculated using the paid loss development method.

Liabilities for future policy benefits supporting the group products within our Unum International segment are calculated using generally the same methodology that we use for Unum US group disability and group life liabilities. Liabilities for future policy benefits for our Unum UK group life dependent product, which provides an annuity to the beneficiary upon the death of an employee, are calculated using discounted cash flows, based on our assumptions for claim duration and discount rates. The assumptions used in calculating liabilities for future policy benefits for this segment are based on standard country-specific industry experience, adjusted for our own experience.

63

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2023

Note 7 - Liability for Future Policy Benefits - Continued

Certain products in the Colonial Life segment and the Unum US voluntary benefits product line have shorter-term benefits, which generally have less estimation variability than our longer-term products because of the shorter claim payout period. Our liabilities for future policy benefits for these lines of business are predominantly determined using the incurred loss development method based on our own experience. The incurred loss development method uses the historical patterns of payments by loss date to predict future claim payments for each loss date. Where the incurred loss development method may not be appropriate, we estimate the incurred claims using an expected claim cost per policy or other measure of exposure.

During the third quarter of 2023, we completed our annual cash flow assumption review and updated certain of our assumptions used to develop the liability for future policy benefits which resulted in a net increase to the liability. The increase to the liability for future policy benefits was driven primarily by assumption updates in our Closed Block long-term care product line, partially offset by assumption updates in the Unum US group disability product line and in the Colonial Life segment. The long-term care assumption updates were primarily driven by lower expectations for active policy lapse and mortality assumptions, partially offset by an increase to expected future premium rate increases. The Unum US group disability product line assumption updates were primarily related to claim resolution assumptions driven by favorable claim recovery trends, while the Colonial Life segment assumption updates were driven by improved claim cost assumptions and increases in policyholder lapse rates.

During the third quarter of 2022, we completed our annual cash flow assumption review and updated certain of our assumptions used to develop the liability for future policy benefits which resulted in a net increase to the liability. The increase to the liability for future policy benefits was driven primarily by assumption updates related to the reinsured portion of our Closed Block segment, mostly offset by assumption updates in the Unum US segment and the Colonial Life segment. The Closed Block segment assumption updates related to the reinsured portion of our all other product line primarily included updates to mortality assumptions for the advanced age portion of our individual disability claimant population. This advanced age claimant population was included in the block ceded as a part of the Closed Block individual disability reinsurance transaction with Commonwealth Annuity and Life Insurance Company. As a result, a corresponding increase was reported in our consolidated balance sheet as a reinsurance recoverable related to these assumption updates. The Unum US segment assumption updates were primarily driven by sustained improvement in claim recovery trends in our group disability and group life product lines, partially offset by lower social security benefit offsets in our group disability product line. The Colonial Life segment assumption updates were primarily driven by improved claim cost assumptions.

Actual variance from expected experience for the first nine months of 2023 and 2022 was driven primarily by our Unum US group disability and Unum US group life and accidental death and dismemberment product lines. The variance for both periods was primarily due to higher than expected claim resolutions driven by recoveries in the Unum US group disability product line and lower than expected new claim incidence for waiver of premium benefits in the Unum US group life and accidental death and dismemberment product line. The variance for the first nine months of 2023 is also impacted by our Closed Block long-term care product line and our Unum US individual disability product line. The variance for our Closed Block long-term care product line was driven by higher than expected incidence, while the variance in our Unum US individual disability product line was driven primarily by lower than expected new claim incidence. The variance for the first nine months of 2022 was also impacted by our Colonial Life cancer and critical illness product line which was driven primarily by lower claim costs.

For the nine months ended September 30, 2023, there were certain cohorts within the Colonial Life segment, related to our cancer and critical illness product line, and certain cohorts within the Closed Block segment, related to our long-term care product line, for which net premiums exceeded gross premiums. The cohorts for which net premiums exceeded the gross premiums in the Closed Block long-term care product line resulted in a $215.5 million reduction to income before income tax for the nine months ended September 30, 2023. For the nine months ended September 30, 2023 and 2022, the cohorts for which net premiums exceeded the gross premiums in the Colonial Life cancer and critical illness product line had an immaterial impact to income before income tax. There were no other product lines with cohorts for which net premiums exceeded gross premiums for the nine months ended September 30, 2023 or 2022.

64

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2023

Note 7 - Liability for Future Policy Benefits - Continued

The following table presents balances as well as the changes in the liability for future policy benefits for traditional long duration products.

	Consolidated
	September 30
	2023		2022
	(in millions of dollars)
Present Value of Expected Net Premiums
Balance, beginning of year	$	12,426.2	$	15,881.3
Beginning balance at original discount rate	12,695.3		13,186.2
Effect of changes in cash flow assumptions	1,499.2		(101.9)
Effect of actual variances from expected experience	(121.8)		(252.3)
Adjusted beginning of year balance	14,072.7		12,832.0
Issuances	861.2		727.2
Interest accretion	430.8		430.0
Net premiums collected	(1,164.9)		(1,184.1)
Foreign currency	(0.1)		(49.5)
Ending balance at original discount rate	14,199.7		12,755.6
Effect of change in discount rate assumptions	(709.0)		(418.5)
Balance, end of period	$	13,490.7	$	12,337.1
Present Value of Expected Future Policy Benefits
Balance, beginning of year	$	48,929.4	$	65,305.0
Beginning balance at original discount rate	49,689.0		50,397.2
Effect of changes in cash flow assumptions	1,702.0		(92.4)
Effect of actual variances from expected experience	(356.4)		(459.6)
Adjusted beginning of year balance	51,034.6		49,845.2
Issuances1	2,547.0		2,602.7
Interest accretion	1,670.3		1,689.3
Benefit payments	(4,106.1)		(4,112.1)
Foreign currency	19.6		(485.7)
Ending balance at original discount rate	51,165.4		49,539.4
Effect of change in discount rate assumptions	(3,111.7)		(1,484.8)
Balance, end of period	$	48,053.7	$	48,054.6
Net liability for future policy benefits	$	34,563.0	$	35,717.5
Other	1,703.3		1,872.7
Total liability for future policy benefits	36,266.3		37,590.2
Less: Reinsurance recoverable related to future policy benefits	7,449.0		8,154.6
Net liability for future policy benefits, after reinsurance recoverable	$	28,817.3	$	29,435.6
1Issuances include new policy issuances for most product lines. For our Unum US group disability, Unum US group life and AD&D and Closed Block - All Other product lines and certain of our Unum International product lines, this line represents new claim incurrals.

65

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2023

Note 7 - Liability for Future Policy Benefits - Continued

The following tables summarize the amount of gross premiums and interest accretion reflected in the statements of income as well as the undiscounted and discounted expected gross premiums and expected future benefit payments and the weighted average interest rates for traditional long duration products presented in the rollforward activity above.

	Consolidated
	Nine Months Ended September 30
	2023		2022
	(in millions of dollars)
Amount recognized in the statement of income:
Gross premiums or assessments	$	7,278.4	$	7,033.8
Interest accretion	$	1,239.5	$	1,259.3

	Consolidated
	September 30
	2023			2022
	(in millions of dollars, except weighted average data)
Amount of undiscounted:
Expected future benefit payments	$	105,306.1		$	97,202.5
Expected future gross premiums	$	38,581.4		$	35,301.8
Amount of discounted (at interest accretion rate):
Expected future gross premiums	$	25,435.2		$	23,835.8
Weighted average interest rate:
Interest accretion rate	4.8		%	4.8		%
Current discount rate	5.6		%	5.2		%
Weighted average duration of the liability	11.5 years			11.0 years

66

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2023

Note 7 - Liability for Future Policy Benefits - Continued

Unum US Segment

The following table presents the balances and changes in the reserves for future policy benefits for traditional long duration products in the Unum US segment.

	September 30, 2023
	Group Disability		Group Life and AD&D		Voluntary Benefits		Individual Disability		Total Unum US
	(in millions of dollars)
Present Value of Expected Net Premiums
Balance, beginning of year	$	—	$	—	$	868.2	$	1,202.9	$	2,071.1
Beginning balance at original discount rate	—		—		937.9		1,228.1		2,166.0
Effect of changes in cash flow assumptions	—		—		180.7		5.0		185.7
Effect of actual variances from expected experience	—		—		(98.2)		(13.6)		(111.8)
Adjusted beginning of year balance	—		—		1,020.4		1,219.5		2,239.9
Issuances	—		—		258.6		164.0		422.6
Interest accretion	—		—		21.4		36.3		57.7
Net premiums collected	—		—		(124.2)		(131.7)		(255.9)
Ending balance at original discount rate	—		—		1,176.2		1,288.1		2,464.3
Effect of change in discount rate assumptions	—		—		(119.4)		(62.2)		(181.6)
Balance, end of period	$	—	$	—	$	1,056.8	$	1,225.9	$	2,282.7
Present Value of Expected Future Policy Benefits
Balance, beginning of year	$	5,533.3	$	972.6	$	1,999.5	$	3,192.8	$	11,698.2
Beginning balance at original discount rate	5,793.1		998.5		2,141.2		3,244.5		12,177.3
Effect of changes in cash flow assumptions	(100.2)		—		170.1		7.9		77.8
Effect of actual variances from expected experience	(187.8)		(28.2)		(109.6)		(42.3)		(367.9)
Adjusted beginning of year balance	5,505.1		970.3		2,201.7		3,210.1		11,887.2
Issuances1	907.1		356.1		270.4		173.8		1,707.4
Interest accretion	137.6		15.8		64.3		123.2		340.9
Benefit payments	(1,186.8)		(402.1)		(143.9)		(203.5)		(1,936.3)
Ending balance at original discount rate	5,363.0		940.1		2,392.5		3,303.6		11,999.2
Effect of change in discount rate assumptions	(310.1)		(35.6)		(280.7)		(190.0)		(816.4)
Balance, end of period	$	5,052.9	$	904.5	$	2,111.8	$	3,113.6	$	11,182.8
Net liability for future policy benefits	$	5,052.9	$	904.5	$	1,055.0	$	1,887.7	$	8,900.1
Other	0.5		1.0		2.4		26.0		29.9
Total liability for future policy benefits	5,053.4		905.5		1,057.4		1,913.7		8,930.0
Less: Reinsurance recoverable related to future policy benefits	32.8		6.2		13.2		148.1		200.3
Net liability for future policy benefits, after reinsurance recoverable	$	5,020.6	$	899.3	$	1,044.2	$	1,765.6	$	8,729.7
1Issuances include new policy issuances for most product lines. Issuances for Unum US group disability and Unum US group life and AD&D represents new claim incurrals.

67

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2023

Note 7 - Liability for Future Policy Benefits - Continued

	September 30, 2022
	Group Disability		Group Life and AD&D		Voluntary Benefits		Individual Disability		Total Unum US
	(in millions of dollars)
Present Value of Expected Net Premiums
Balance, beginning of year	$	—	$	—	$	1,124.8	$	1,494.3	$	2,619.1
Beginning balance at original discount rate	—		—		1,032.3		1,279.6		2,311.9
Effect of changes in cash flow assumptions	—		—		(23.4)		(73.7)		(97.1)
Effect of actual variances from expected experience	—		—		(79.7)		(37.4)		(117.1)
Adjusted beginning of year balance	—		—		929.2		1,168.5		2,097.7
Issuances	—		—		126.0		123.5		249.5
Interest accretion	—		—		22.3		38.2		60.5
Net premiums collected	—		—		(128.6)		(130.5)		(259.1)
Ending balance at original discount rate	—		—		948.9		1,199.7		2,148.6
Effect of change in discount rate assumptions	—		—		(79.4)		(37.2)		(116.6)
Balance, end of period	$	—	$	—	$	869.5	$	1,162.5	$	2,032.0
Present Value of Expected Future Policy Benefits
Balance, beginning of year	$	6,725.7	$	1,124.1	$	2,697.3	$	4,017.3	$	14,564.4
Beginning balance at original discount rate	6,158.3		1,058.3		2,201.8		3,253.3		12,671.7
Effect of changes in cash flow assumptions	(102.0)		(32.9)		(39.9)		(53.4)		(228.2)
Effect of actual variances from expected experience	(174.1)		(29.0)		(82.3)		(43.1)		(328.5)
Adjusted beginning of year balance	5,882.2		996.4		2,079.6		3,156.8		12,115.0
Issuances1	1,038.9		377.5		140.5		131.1		1,688.0
Interest accretion	162.2		18.8		65.2		116.9		363.1
Benefit payments	(1,228.7)		(424.1)		(147.5)		(192.8)		(1,993.1)
Ending balance at original discount rate	5,854.6		968.6		2,137.8		3,212.0		12,173.0
Effect of change in discount rate assumptions	(284.6)		(32.5)		(167.5)		(95.7)		(580.3)
Balance, end of period	$	5,570.0	$	936.1	$	1,970.3	$	3,116.3	$	11,592.7
Net liability for future policy benefits	$	5,570.0	$	936.1	$	1,100.8	$	1,953.8	$	9,560.7
Other	0.5		0.9		15.1		24.7		41.2
Total liability for future policy benefits	5,570.5		937.0		1,115.9		1,978.5		9,601.9
Less: Reinsurance recoverable related to future policy benefits	36.8		6.0		23.4		189.7		255.9
Net liability for future policy benefits, after reinsurance recoverable	$	5,533.7	$	931.0	$	1,092.5	$	1,788.8	$	9,346.0
1Issuances include new policy issuances for most product lines. Issuances for Unum US group disability and Unum US group life and AD&D represents new claim incurrals.

68

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2023

Note 7 - Liability for Future Policy Benefits - Continued

The following tables summarize the amount of gross premiums and interest accretion reflected in the statements of income as well as the undiscounted and discounted expected gross premiums and expected future benefit payments and the weighted average interest rates for traditional long duration products in the Unum US segment presented in the rollforward activity above.

	Nine Months Ended September 30, 2023
	Group Disability		Group Life and AD&D		Voluntary Benefits		Individual Disability		Total Unum US
	(in millions of dollars)
Amount recognized in the statement of income:
Gross premiums or assessments	$	2,210.4	$	1,403.2	$	592.1	$	474.2	$	4,679.9
Interest accretion	$	137.6	$	15.8	$	42.9	$	86.9	$	283.2

	Nine Months Ended September 30, 2022
	Group Disability		Group Life and AD&D		Voluntary Benefits		Individual Disability		Total Unum US
	(in millions of dollars)
Amount recognized in the statement of income:
Gross premiums or assessments	$	2,073.5	$	1,396.0	$	583.1	$	446.9	$	4,499.5
Interest accretion	$	162.2	$	18.8	$	42.9	$	78.7	$	302.6

	September 30, 2023
	Group Disability			Group Life and AD&D			Voluntary Benefits			Individual Disability			Total Unum US
	(in millions of dollars, except weighted average data)
Amount of undiscounted:
Expected future benefit payments	$	6,474.2		$	1,069.2		$	5,107.4		$	5,292.7		$	17,943.5
Expected future gross premiums	$	—		$	—		$	5,317.5		$	5,701.8		$	11,019.3
Amount of discounted (at interest accretion rate):
Expected future gross premiums	$	—		$	—		$	3,663.8		$	4,099.5		$	7,763.3
Weighted average interest rate:
Interest accretion rate	4.0		%	2.3		%	5.0		%	5.1		%	4.2		%
Current discount rate	5.4		%	3.1		%	5.7		%	5.7		%	5.3		%
Weighted average duration of the liability	4.3 years			2.7 years			18.2 years			9.6 years			6.9 years

69

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2023

Note 7 - Liability for Future Policy Benefits - Continued

	September 30, 2022
	Group Disability			Group Life and AD&D			Voluntary Benefits			Individual Disability			Total Unum US
	(in millions of dollars, except weighted average data)
Amount of undiscounted:
Expected future benefit payments	$	7,077.3		$	1,124.5		$	4,555.1		$	5,112.5		$	17,869.4
Expected future gross premiums	$	—		$	—		$	4,006.6		$	5,461.8		$	9,468.4
Amount of discounted (at interest accretion rate):
Expected future gross premiums	$	—		$	—		$	2,970.1		$	3,916.2		$	6,886.3
Weighted average interest rate:
Interest accretion rate	3.8		%	2.4		%	5.1		%	5.1		%	4.1%
Current discount rate	5.0		%	3.1		%	5.3		%	5.2		%	4.9%
Weighted average duration of the liability	4.4 years			3.1 years			18.0 years			9.4 years			6.8 years

70

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2023

Note 7 - Liability for Future Policy Benefits - Continued

Unum International Segment

The following table presents the balances and changes in the reserves for future policy benefits for traditional long duration products in the Unum International segment.

	September 30
	2023		2022
	(in millions of dollars)
Present Value of Expected Net Premiums
Balance, beginning of year	$	197.1	$	260.5
Beginning balance at original discount rate	246.8		258.1
Effect of changes in cash flow assumptions	(5.1)		(0.3)
Effect of actual variances from expected experience	12.2		5.4
Adjusted beginning of year balance	253.9		263.2
Issuances	16.9		13.4
Interest accretion	6.9		6.5
Net premiums collected	(16.9)		(17.3)
Foreign currency	(0.1)		(49.5)
Ending balance at original discount rate	260.7		216.3
Effect of change in discount rate assumptions	(37.6)		(46.9)
Balance, end of period	$	223.1	$	169.4
Present Value of Expected Future Policy Benefits
Balance, beginning of year	$	2,231.4	$	3,181.8
Beginning balance at original discount rate	2,495.5		2,703.8
Effect of changes in cash flow assumptions	17.7		(20.1)
Effect of actual variances from expected experience	(9.2)		23.5
Adjusted beginning of year balance	2,504.0		2,707.2
Issuances1	277.3		287.9
Interest accretion	47.7		50.0
Benefit payments	(307.5)		(270.3)
Foreign currency	19.6		(485.7)
Ending balance at original discount rate	2,541.1		2,289.1
Effect of change in discount rate assumptions	(297.1)		(345.4)
Balance, end of period	$	2,244.0	$	1,943.7
Net liability for future policy benefits	$	2,020.9	$	1,774.3
Other	30.3		24.9
Total liability for future policy benefits	2,051.2		1,799.2
Less: Reinsurance recoverable related to future policy benefits	69.4		57.8
Net liability for future policy benefits, after reinsurance recoverable	$	1,981.8	$	1,741.4
1Issuances for Unum International primarily represents new claim incurrals.

71

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2023

Note 7 - Liability for Future Policy Benefits - Continued

The following tables summarize the amount of gross premiums and interest accretion reflected in the statements of income as well as the undiscounted and discounted expected gross premiums and expected future benefit payments and the weighted average interest rates for traditional long duration products in the Unum International segment presented in the rollforward activity above.

	Nine Months Ended September 30
	2023		2022
	(in millions of dollars)
Amount recognized in the statement of income:
Gross premiums or assessments	$	667.7	$	590.4
Interest accretion	$	40.8	$	43.5

	September 30
	2023			2022
	(in millions of dollars, except weighted average data)
Amount of undiscounted:
Expected future benefit payments	$	4,012.8		$	3,642.0
Expected future gross premiums	$	1,035.7		$	814.9
Amount of discounted (at interest accretion rate):
Expected future gross premiums	$	676.8		$	545.1
Weighted average interest rate:
Interest accretion rate	4.0		%	3.9		%
Current discount rate	5.4		%	5.9		%
Weighted average duration of the liability	8.6 years			8.5 years

72

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2023

Note 7 - Liability for Future Policy Benefits - Continued

Colonial Life Segment

The following table presents the balances and changes in the reserves for future policy benefits for traditional long duration products in the Colonial Life segment.

	September 30
	2023		2022
	(in millions of dollars)
Present Value of Expected Net Premiums
Balance, beginning of year	$	3,745.4	$	4,597.0
Beginning balance at original discount rate	4,046.4		4,158.9
Effect of changes in cash flow assumptions	(322.7)		(32.3)
Effect of actual variances from expected experience	(77.1)		(105.8)
Adjusted beginning of year balance	3,646.6		4,020.8
Issuances	421.7		464.3
Interest accretion	94.3		99.4
Net premiums collected	(454.0)		(483.6)
Ending balance at original discount rate	3,708.6		4,100.9
Effect of change in discount rate assumptions	(348.7)		(353.2)
Balance, end of period	$	3,359.9	$	3,747.7
Present Value of Expected Future Policy Benefits
Balance, beginning of year	$	5,581.1	$	7,054.8
Beginning balance at original discount rate	6,163.9		6,201.5
Effect of changes in cash flow assumptions	(402.9)		(85.9)
Effect of actual variances from expected experience	(90.1)		(133.4)
Adjusted beginning of year balance	5,670.9		5,982.2
Issuances	461.1		502.9
Interest accretion	161.0		165.1
Benefit payments	(462.1)		(467.4)
Ending balance at original discount rate	5,830.9		6,182.8
Effect of change in discount rate assumptions	(731.9)		(667.5)
Balance, end of period	$	5,099.0	$	5,515.3
Net liability for future policy benefits	$	1,739.1	$	1,767.6
Other	24.3		23.9
Total liability for future policy benefits	1,763.4		1,791.5
Less: Reinsurance recoverable related to future policy benefits	0.9		1.3
Net liability for future policy benefits, after reinsurance recoverable	$	1,762.5	$	1,790.2

73

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2023

Note 7 - Liability for Future Policy Benefits - Continued

The following tables summarize the amount of gross premiums and interest accretion reflected in the statements of income as well as the undiscounted and discounted expected gross premiums and expected future benefit payments and the weighted average interest rates for traditional long duration products in the Colonial Life segment presented in the rollforward activity above.

	Nine Months Ended September 30
	2023		2022
	(in millions of dollars)
Amount recognized in the statement of income:
Gross premiums or assessments	$	1,240.3	$	1,228.3
Interest accretion	$	66.7	$	65.7

	September 30
	2023			2022
	(in millions of dollars, except weighted average data)
Amount of undiscounted:
Expected future benefit payments	$	9,568.2		$	9,984.0
Expected future gross premiums	$	11,847.5		$	12,205.8
Amount of discounted (at interest accretion rate):
Expected future gross premiums	$	8,684.1		$	8,996.4
Weighted average interest rate:
Interest accretion rate	4.3		%	4.4		%
Current discount rate	5.7		%	5.3		%
Weighted average duration of the liability	16.9 years			17.9 years

74

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2023

Note 7 - Liability for Future Policy Benefits - Continued

Closed Block Segment

The following table presents the balances and changes in the reserves for future policy benefits for traditional long duration products in the Closed Block segment.

	September 30, 2023
	Long-term Care		All Other		Total Closed Block
	(in millions of dollars)
Present Value of Expected Net Premiums
Balance, beginning of year	$	6,412.6	$	—	$	6,412.6
Beginning balance at original discount rate	6,236.1		—		6,236.1
Effect of changes in cash flow assumptions	1,641.3		—		1,641.3
Effect of actual variances from expected experience	54.9		—		54.9
Adjusted beginning of year balance	7,932.3		—		7,932.3
Interest accretion	271.9		—		271.9
Net premiums collected	(438.1)		—		(438.1)
Ending balance at original discount rate	7,766.1		—		7,766.1
Effect of change in discount rate assumptions	(141.1)		—		(141.1)
Balance, end of period	$	7,625.0	$	—	$	7,625.0
Present Value of Expected Future Policy Benefits
Balance, beginning of year	$	21,199.9	$	8,218.8	$	29,418.7
Beginning balance at original discount rate	20,221.6		8,630.7		28,852.3
Effect of changes in cash flow assumptions	2,009.4		—		2,009.4
Effect of actual variances from expected experience	106.7		4.1		110.8
Adjusted beginning of year balance	22,337.7		8,634.8		30,972.5
Issuances1	—		101.2		101.2
Interest accretion	850.7		270.0		1,120.7
Benefit payments	(624.2)		(776.0)		(1,400.2)
Ending balance at original discount rate	22,564.2		8,230.0		30,794.2
Effect of change in discount rate assumptions	(579.3)		(687.0)		(1,266.3)
Balance, end of period	$	21,984.9	$	7,543.0	$	29,527.9
Net liability for future policy benefits	$	14,359.9	$	7,543.0	21,902.9
Other2	12.8		1,606.0		1,618.8
Total liability for future policy benefits	14,372.7		9,149.0		23,521.7
Less: Reinsurance recoverable related to future policy benefits	4.6		7,173.7		7,178.3
Net liability for future policy benefits, after reinsurance recoverable	$	14,368.1	$	1,975.3	$	16,343.4
1Issuances for Closed Block - All Other represents new claim incurrals.
2Other for Closed Block - All Other primarily includes our closed block group pension products and certain of our ceded closed block individual life products.

75

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2023

Note 7 - Liability for Future Policy Benefits - Continued

	September 30, 2022
	Long-term Care		All Other		Total Closed Block
	(in millions of dollars)
Present Value of Expected Net Premiums
Balance, beginning of year	$	8,404.7	$	—	$	8,404.7
Beginning balance at original discount rate	6,457.3		—		6,457.3
Effect of changes in cash flow assumptions	27.8		—		27.8
Effect of actual variances from expected experience	(34.8)		—		(34.8)
Adjusted beginning of year balance	6,450.3		—		6,450.3
Interest accretion	263.6		—		263.6
Net premiums collected	(424.1)		—		(424.1)
Ending balance at original discount rate	6,289.8		—		6,289.8
Effect of change in discount rate assumptions	98.2		—		98.2
Balance, end of period	$	6,388.0	$	—	$	6,388.0
Present Value of Expected Future Policy Benefits
Balance, beginning of year	$	30,089.6	$	10,414.4	$	40,504.0
Beginning balance at original discount rate	19,870.8		8,949.4		28,820.2
Effect of changes in cash flow assumptions	24.9		216.9		241.8
Effect of actual variances from expected experience	(39.3)		18.1		(21.2)
Adjusted beginning of year balance	19,856.4		9,184.4		29,040.8
Issuances1	—		123.9		123.9
Interest accretion	829.7		281.4		1,111.1
Benefit payments	(548.7)		(832.6)		(1,381.3)
Ending balance at original discount rate	20,137.4		8,757.1		28,894.5
Effect of change in discount rate assumptions	629.6		(521.2)		108.4
Balance, end of period	$	20,767.0	$	8,235.9	$	29,002.9
Net liability for future policy benefits	$	14,379.0	$	8,235.9	$	22,614.9
Other2	22.8		1,759.9		1,782.7
Total liability for future policy benefits	14,401.8		9,995.8		24,397.6
Less: Reinsurance recoverable related to future policy benefits	5.3		7,834.2		7,839.5
Net liability for future policy benefits, after reinsurance recoverable	$	14,396.5	$	2,161.6	$	16,558.1
1Issuances for Closed Block - All Other represents new claim incurrals.
2Other for Closed Block - All Other primarily includes our closed block group pension products and certain of our ceded closed block individual life products.

76

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2023

Note 7 - Liability for Future Policy Benefits - Continued

The following tables summarize the amount of gross premiums and interest accretion reflected in the statements of income as well as the undiscounted and discounted expected gross premiums and expected future benefit payments and the weighted average interest rates for traditional long duration products in the Closed Block segment presented in the rollforward activity above.

	Nine Months Ended September 30, 2023
	Long-term Care		All Other		Total Closed Block
	(in millions of dollars)
Amount recognized in the statement of income:
Gross premiums or assessments	$	521.2	$	169.3	$	690.5
Interest accretion	$	578.8	$	270.0	$	848.8

	Nine Months Ended September 30, 2022
	Long-term Care		All Other		Total Closed Block
	(in millions of dollars)
Amount recognized in the statement of income:
Gross premiums or assessments	$	523.0	$	192.6	$	715.6
Interest accretion	$	566.1	$	281.4	$	847.5

	September 30, 2023
	Long-term Care			All Other			Total Closed Block
	(in millions of dollars, except weighted average data)
Amount of undiscounted:
Expected future benefit payments	$	61,672.0		$	12,109.6		$	73,781.6
Expected future gross premiums	$	14,678.9		$	—		$	14,678.9
Amount of discounted (at interest accretion rate):
Expected future gross premiums	$	8,311.0		$	—		$	8,311.0
Weighted average interest rate:
Interest accretion rate	5.6		%	4.6		%	5.2		%
Current discount rate	5.8%			5.7		%	5.8		%
Weighted average duration of the liability	16.6 years			7.3 years			13.3 years

77

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2023

Note 7 - Liability for Future Policy Benefits - Continued

	September 30, 2022
	Long-term Care			All Other			Total Closed Block
	(in millions of dollars, except weighted average data)
Amount of undiscounted:
Expected future benefit payments	$	52,756.7		$	12,950.4		$	65,707.1
Expected future gross premiums	$	12,812.7		$	—		$	12,812.7
Amount of discounted (at interest accretion rate):
Expected future gross premiums	$	7,408.0		$	—		$	7,408.0
Weighted average interest rate:
Interest accretion rate	5.5		%	4.6		%	5.2%
Current discount rate	5.3		%	5.3		%	5.3%
Weighted average duration of the liability	15.7 years			7.4 years			12.5 years

78

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2023

Note 7 - Liability for Future Policy Benefits - Continued

Reconciliation

A reconciliation of the liability for future policy benefits reflected in the preceding rollforwards to the related liability balances in the consolidated balance sheets are as follows:

	September 30
	2023		2022
	(in millions of dollars)
Liability for future policy benefits
Unum US1	$	8,930.0	$	9,601.9
Unum International	2,051.2		1,799.2
Colonial Life	1,763.4		1,791.5
Closed Block1	23,521.7		24,397.6
Other products1	236.1		217.8
Total liability for future policy benefits	$	36,502.4	$	37,808.0

1Unum US excludes dental & vision and medical stop-loss product lines and Closed Block excludes our participating fund account, which represents policies issued by one of our subsidiaries prior to its 1986 conversion from a mutual stock life insurance company. The liabilities associated with these products are included within Other products.

79

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2023

Note 8 - Policyholders' Account Balances

Policyholders' account balances primarily include our universal life and corporate-owned life insurance products. Policyholders' account balances reflect customer deposits and interest credited less cost of insurance, administration expenses, surrender charges, and customer withdrawals. Our unearned revenue reserve, claim reserves and certain other reserves related to our universal life products and corporate-owned life insurance products are also reported as a component of policyholders’ account balances. Policyholders' account balances require loss recognition testing. We perform loss recognition tests on these reserves annually, or more frequently if appropriate, using best estimate assumptions as of the date of the test, without a provision for adverse deviation. We group the policy reserves for each major product line within a reporting segment when we perform the loss recognition tests. If the policy reserves determined using these best estimate assumptions are higher than our existing policy reserves net of any deferred acquisition cost balance, the existing policy reserves are increased or deferred acquisition costs are reduced to immediately recognize the deficiency. This becomes the new basis for reserves going forward, subject to future loss recognition testing. Anticipated investment income, based on our anticipated portfolio yield rates after consideration for defaults and investment expenses, is considered when performing loss recognition testing for long-duration contracts.

The following table presents the balances and changes in the policyholders' account balances:

	September 30, 2023
	Unum US - Voluntary Benefits		Colonial Life		Closed Block - All Other		Total
	(in millions of dollars, except weighted average data)
Balance, beginning of year	$	586.8	$	852.4	$	4,159.4	$	5,598.6
Premiums received	44.9		64.4		25.2		134.5
Policy charges1	(45.8)		(56.3)		(78.9)		(181.0)
Surrenders and withdrawals	(23.6)		(28.5)		(12.1)		(64.2)
Benefit payments	(7.5)		(5.6)		(191.0)		(204.1)
Interest credited	17.0		25.7		239.0		281.7
Other	6.7		(0.2)		24.3		30.8
Balance, end of period	578.5		851.9		4,165.9		5,596.3
Reserves in excess of account balance	99.2		16.6		32.4		148.2
Total policyholders' account balances	677.7		868.5		4,198.3		5,744.5
Less: Reinsurance recoverable related to policyholders' account balances	1.0		—		4,198.3		4,199.3
Net policyholders' account balances, after reinsurance recoverable	$	676.7	$	868.5	$	—	$	1,545.2
Weighted average crediting rate	4.0%		4.1%		8.0%		6.9%
Net amount at risk2	$	4,600.0	$	8,901.6	$	1,807.1	$	15,308.7
Cash surrender value	$	568.9	$	810.1	$	4,033.4	$	5,412.4
1Contracts included in the policyholder account balances are generally charged a premium and/or monthly assessments on the basis of the account balance.
2For those guarantees of benefits that are payable in the event of death, the net amount at risk is generally defined as the current guaranteed minimum death benefit in excess of the current account balance at the balance sheet date.

80

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2023

Note 8 - Policyholders' Account Balances - Continued

	September 30, 2022
	Unum US - Voluntary Benefits		Colonial Life		Closed Block - All Other		Total
	(in millions of dollars, except weighted average data)
Balance, beginning of year	$	598.7	$	849.2	$	4,231.7	$	5,679.6
Premiums received	49.2		68.8		25.1		143.1
Policy charges1	(48.8)		(58.9)		(77.0)		(184.7)
Surrenders and withdrawals	(25.6)		(27.9)		(18.7)		(72.2)
Benefit payments	(8.0)		(6.0)		(189.3)		(203.3)
Interest credited	17.8		25.6		232.9		276.3
Other	5.8		0.1		30.2		36.1
Balance, end of period	589.1		850.9		4,234.9		5,674.9
Reserves in excess of account balance	89.4		17.5		31.0		137.9
Total policyholders' account balances	678.5		868.4		4,265.9		5,812.8
Less: Reinsurance recoverable related to policyholders' account balances	1.0		0.1		4,265.9		4,267.0
Net policyholders' account balances, after reinsurance recoverable	$	677.5	$	868.3	$	—	$	1,545.8
Weighted average crediting rate	4.1%		4.1%		7.6%		6.7%
Net amount at risk2	$	5,008.7	$	9,490.5	$	1,920.1	$	16,419.3
Cash surrender value	$	585.4	$	796.8	$	4,093.2	$	5,475.4
1Contracts included in the policyholder account balances are generally charged a premium and/or monthly assessments on the basis of the account balance.
2For those guarantees of benefits that are payable in the event of death, the net amount at risk is generally defined as the current guaranteed minimum death benefit in excess of the current account balance at the balance sheet date.

81

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2023

Note 8 - Policyholders' Account Balances - Continued

The balance of the account values by range of guaranteed minimum crediting rates and the related range of difference, in basis points, between rates being credited to policyholders and the respective guaranteed minimums is as follows.

	September 30, 2023
Range of Guaranteed Minimum Crediting Rate	At Guaranteed Minimum		1 Basis Point - 50 Basis Points Above		51 Basis Points - 150 Basis Points Above		Greater than 150 Basis Points Above		Total
	(in millions of dollars)
	Unum US - Voluntary Benefits
3.00% - 3.99%	$	91.6	$	—	$	—	$	—	$	91.6
4.00% - 4.99%	265.4		188.5		—		—		453.9
5.00% - 6.00%	33.0		—		—		—		33.0
	390.0		188.5		—		—		578.5
	Colonial Life
4.00% - 5.00%	845.8		6.1		—		—		851.9
	Closed Block - All Other
3.00% - 5.99%	431.3		1,181.2		27.1		—		1,639.6
6.00% - 8.99%	2.1		28.5		—		—		30.6
9.00% - 11.99%	398.4		1,914.7		—		—		2,313.1
12.00% - 15.00%	—		182.6		—		—		182.6
	831.8		3,307.0		27.1		—		4,165.9
Total	$	2,067.6	$	3,501.6	$	27.1	$	—	$	5,596.3

82

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2023

Note 8 - Policyholders' Account Balances - Continued

	September 30, 2022
Range of Guaranteed Minimum Crediting Rate	At Guaranteed Minimum		1 Basis Point - 50 Basis Points Above		51 Basis Points - 150 Basis Points Above		Greater than 150 Basis Points Above		Total
	(in millions of dollars)
	Unum US - Voluntary Benefits
3.00% - 3.99%	$	95.3	$	—	$	—	$	—	$	95.3
4.00% - 4.99%	277.4		182.2		—		—		459.6
5.00% - 6.00%	34.2		—		—		—		34.2
	406.9		182.2		—		—		589.1
	Colonial Life
4.00% - 5.00%	845.0		5.9		—		—		850.9
	Closed Block - All Other
3.00% - 5.99%	1,708.4		29.1		6.6		—		1,744.1
6.00% - 8.99%	30.5		—		—		—		30.5
9.00% - 11.99%	2,289.6		—		—		—		2,289.6
12.00% - 15.00%	170.7		—		—		—		170.7
	4,199.2		29.1		6.6		—		4,234.9
Total	$	5,451.1	$	217.2	$	6.6	$	—	$	5,674.9

Note 9 - Deferred Acquisition Costs

DAC represents the deferred incremental direct costs associated with the successful acquisition of new or renewal insurance contracts. Such costs include commissions, other agency compensation, certain selection and policy issue expenses, and certain field expenses. Acquisition costs that do not vary with the production of new business, such as commissions on group products which are generally level throughout the life of the policy, are excluded from the deferral.

Our insurance contracts are grouped by product type and contract issue year into cohorts consistent with the grouping used to estimate the related contract liabilities. DAC is amortized on a constant level basis over the life of the policy. For all products, in-force volume metrics are used as the constant level basis. The lapse and mortality assumptions used to amortize DAC for our traditional long-duration products are consistent with the assumptions used to estimate the liability for future policy benefits. The underlying assumptions used to determine DAC amortization are updated concurrently with any related assumption changes for the liability for future policy benefits and changes in estimates are recognized prospectively over the remaining expected term of the related contracts. Amortization expense is adjusted based on actual versus expected experience through an adjustment to the prospective rate of amortization.

For certain products, policyholders can elect to modify product benefits, features, rights, or coverages by exchanging a contract for a new contract or by amendment, endorsement, or rider to a contract, or by the election of a feature or coverage within a contract. These transactions are known as internal replacement transactions, principally on group contracts. Internal replacement transactions wherein the modification does not substantially change the policy are accounted for as continuations of the replaced contracts. The original policy continues to be reflected as an in force policy within its original cohort. The policy's expected life then impacts the amortization of remaining unamortized deferred acquisition costs within its cohort. The costs of replacing the policy are accounted for as policy maintenance costs and expensed as incurred. Internal replacement transactions that result in a policy that is substantially changed are accounted for as an extinguishment of the original policy and the issuance of a new policy. The original policy that was replaced is terminated from its original cohort and this termination is

83

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2023

Note 9 - Deferred Acquisition Costs - Continued

reflected in the amortization rate of remaining unamortized deferred acquisition costs for the cohort. The costs of acquiring the new policy are capitalized and amortized as part of a new cohort.

During the third quarter of 2023, we updated our policyholder lapse and mortality assumptions used to develop the future amortization for DAC for the Unum US voluntary benefits product line and the Colonial Life segment. During the third quarter of 2022, we updated our policyholder lapse and mortality assumptions used to develop the future amortization for DAC for the Unum US individual disability and voluntary benefits product lines as well as for the Colonial Life segment. These assumption updates were consistent with the related assumption updates for the liability for future policy benefits.

The following tables display the changes in DAC throughout the period:

	September 30, 2023
	Unum US		Unum International		Colonial Life		Total
	(in millions of dollars)
Balance, beginning of year	$	1,185.1	$	37.0	$	1,337.9	$	2,560.0
Capitalization	230.6		10.8		226.1		467.5
Amortization expense	(199.2)		(6.1)		(153.4)		(358.7)
Foreign currency	—		(0.1)		—		(0.1)
Balance, end of period	$	1,216.5	$	41.6	$	1,410.6	$	2,668.7

	September 30, 2022
	Unum US		Unum International		Colonial Life		Total
	(in millions of dollars)
Balance, beginning of year	$	1,152.9	$	36.4	$	1,238.1	$	2,427.4
Capitalization	199.4		9.3		210.4		419.1
Amortization expense	(178.5)		(6.1)		(128.4)		(313.0)
Foreign currency	—		(7.0)		—		(7.0)
Balance, end of period	$	1,173.8	$	32.6	$	1,320.1	$	2,526.5

	September 30, 2023
	Group Disability		Group Life and AD&D		Voluntary Benefits		Individual Disability		Dental and Vision		Total Unum US
	(in millions of dollars)
Balance, beginning of year	$	61.0	$	49.3	$	601.0	$	464.4	$	9.4	$	1,185.1
Capitalization	44.7		28.9		85.2		62.6		9.2		230.6
Amortization expense	(42.1)		(29.5)		(79.5)		(40.2)		(7.9)		(199.2)
Balance, end of period	$	63.6	$	48.7	$	606.7	$	486.8	$	10.7	$	1,216.5

84

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2023

Note 9 - Deferred Acquisition Costs - Continued

	September 30, 2022
	Group Disability		Group Life and AD&D		Voluntary Benefits		Individual Disability		Dental and Vision		Total Unum US
	(in millions of dollars)
Balance, beginning of year	$	60.9	$	53.9	$	588.6	$	441.8	$	7.7	$	1,152.9
Capitalization	38.1		26.9		76.0		50.9		7.5		199.4
Amortization expense	(38.0)		(30.5)		(66.6)		(36.8)		(6.6)		(178.5)
Balance, end of period	$	61.0	$	50.3	$	598.0	$	455.9	$	8.6	$	1,173.8

85

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2023

Note 10 - Segment Information

We have three principal operating business segments: Unum US, Unum International, and Colonial Life. Our other segments are Closed Block and Corporate.

Segment information is shown below. Certain prior year amounts were reclassified to conform to current year presentation.

	Three Months Ended September 30				Nine Months Ended September 30
	2023		2022		2023		2022
	(in millions of dollars)
Premium Income
Unum US
Group Disability
Group Long-term Disability	$	518.5	$	480.9	$	1,539.3	$	1,419.2
Group Short-term Disability	256.5		232.2		753.0		685.9
Group Life and Accidental Death & Dismemberment
Group Life	423.0		417.7		1,254.3		1,249.9
Accidental Death & Dismemberment	44.1		43.8		131.2		129.7
Supplemental and Voluntary
Voluntary Benefits	209.5		196.2		637.4		629.2
Individual Disability	136.7		118.9		386.7		350.3
Dental and Vision	69.4		67.1		206.8		206.6
	1,657.7		1,556.8		4,908.7		4,670.8
Unum International
Unum UK
Group Long-term Disability	101.1		89.8		297.5		287.5
Group Life	44.2		35.0		124.5		100.5
Supplemental	34.6		27.4		99.9		85.8
Unum Poland	30.7		21.1		85.2		66.7
	210.6		173.3		607.1		540.5
Colonial Life
Accident, Sickness, and Disability	236.7		236.1		708.0		714.0
Life	106.2		100.2		318.1		303.2
Cancer and Critical Illness	88.3		87.0		265.2		264.4
	431.2		423.3		1,291.3		1,281.6
Closed Block
Long-term Care	172.1		174.5		521.2		523.0
All Other	54.3		61.0		166.0		190.4
	226.4		235.5		687.2		713.4
Total Premium Income	$	2,525.9	$	2,388.9	$	7,494.3	$	7,206.3

86

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2023

Note 10 - Segment Information - Continued

	Unum US		Unum International		Colonial Life		Closed Block		Corporate		Total
	(in millions of dollars)
Three Months Ended September 30, 2023
Premium Income	$	1,657.7	$	210.6	$	431.2	$	226.4	$	—	$	2,525.9
Net Investment Income	166.2		27.3		39.3		274.9		18.3		526.0
Other Income	58.0		0.5		0.3		12.8		—		71.6
Adjusted Operating Revenue	$	1,881.9	$	238.4	$	470.8	$	514.1	$	18.3	$	3,123.5
Adjusted Operating Income (Loss)	$	357.8	$	36.8	$	102.9	$	34.2	$	(41.5)	$	490.2
Three Months Ended September 30, 2022
Premium Income	$	1,556.8	$	173.3	$	423.3	$	235.5	$	—	$	2,388.9
Net Investment Income	170.6		37.0		38.6		251.4		14.0		511.6
Other Income	49.0		0.2		0.3		13.1		0.4		63.0
Adjusted Operating Revenue	$	1,776.4	$	210.5	$	462.2	$	500.0	$	14.4	$	2,963.5
Adjusted Operating Income (Loss)	$	280.8	$	24.9	$	117.9	$	42.1	$	(49.5)	$	416.2

	Unum US		Unum International		Colonial Life		Closed Block		Corporate		Total
	(in millions of dollars)
Nine Months Ended September 30, 2023
Premium Income	$	4,908.7	$	607.1	$	1,291.3	$	687.2	$	—	$	7,494.3
Net Investment Income	481.5		104.0		114.6		796.0		69.8		1,565.9
Other Income	166.1		1.0		0.9		40.1		2.5		210.6
Adjusted Operating Revenue	$	5,556.3	$	712.1	$	1,406.8	$	1,523.3	$	72.3	$	9,270.8
Adjusted Operating Income (Loss)	$	1,013.4	$	118.7	$	312.3	$	143.6	$	(109.9)	$	1,478.1
Nine Months Ended September 30, 2022
Premium Income	$	4,670.8	$	540.5	$	1,281.6	$	713.4	$	—	$	7,206.3
Net Investment Income	509.4		122.3		115.4		817.7		33.0		1,597.8
Other Income	146.8		0.7		0.8		45.6		3.6		197.5
Adjusted Operating Revenue	$	5,327.0	$	663.5	$	1,397.8	$	1,576.7	$	36.6	$	9,001.6
Adjusted Operating Income (Loss)	$	741.0	$	78.9	$	317.4	$	207.6	$	(126.8)	$	1,218.1

87

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2023

Note 10 - Segment Information - Continued

	September 30		December 31
	2023		2022
	(in millions of dollars)
Assets
Unum US	$	15,088.5	$	16,356.3
Unum International	3,165.9		3,129.4
Colonial Life	4,608.6		4,575.0
Closed Block	33,070.4		33,776.6
Corporate	4,021.1		3,311.2
Total Assets	$	59,954.5	$	61,148.5

We measure and analyze our segment performance on the basis of "adjusted operating revenue" and "adjusted operating income" or "adjusted operating loss", which differ from total revenue and income before income tax as presented in our consolidated statements of income due to the exclusion of investment gains or losses, the amortization of the cost of reinsurance, the impact of non-contemporaneous reinsurance, and reserve assumption updates as specified in the reconciliations below. We believe adjusted operating revenue and adjusted operating income or loss are better performance measures and better indicators of the revenue and profitability and underlying trends in our business. These performance measures are in accordance with GAAP guidance for segment reporting, but they should not be viewed as a substitute for total revenue, income before income tax, net income, or net loss. 

Investment gains or losses primarily include realized investment gains or losses, expected investment credit losses, and gains or losses on derivatives. Investment gains or losses depend on market conditions and do not necessarily relate to decisions regarding the underlying business of our segments. Our investment focus is on investment income to support our insurance liabilities as opposed to the generation of investment gains or losses. Although we may experience investment gains or losses which will affect future earnings levels, a long-term focus is necessary to maintain profitability over the life of the business since our underlying business is long-term in nature, and we need to earn the interest rates assumed in calculating our liabilities.

Cash flow assumptions used to calculate our liability for future policy benefits are reviewed at least annually and updated, as needed, with the resulting impact reflected in net income. While the effects of these assumption updates are recorded in the reporting period in which the review is completed, these updates reflect experience emergence and changes to expectations spanning multiple periods. We believe that by excluding the impact of reserve assumption updates we are providing a more comparable and consistent view of our quarterly results.

We exited a substantial portion of our Closed Block individual disability product line through the two phases of the reinsurance transaction that were executed in December 2020 and March 2021. As a result, we exclude the amortization of the cost of reinsurance that we recognized upon the exit of the business related to the policies on claim status as well as the impact of non-contemporaneous reinsurance that resulted from the adoption of ASU 2018-12. Due to the execution of the second phase of the reinsurance transaction occurring after January 1, 2021, the transition date of ASU 2018-12, in accordance with the provisions of the ASU related to non-contemporaneous reinsurance, we were required to establish the ceded reserves using an upper-medium grade fixed-income instrument as of the reinsurance transaction date in March 2021 which resulted in higher ceded reserves compared to that which was reported historically. However, the direct reserves for the block reinsured in the second phase were calculated using the original discount rate utilized as of the transition date. Both the direct and ceded reserves are then remeasured at each reporting period using a current discount rate reflective of an upper-medium grade fixed-income instrument, with the changes recognized in OCI. While the total equity impact is neutral, the different original discount rates utilized for direct and ceded reserves result in disproportionate earnings impacts. The impact of non-contemporaneous reinsurance will fluctuate depending on the magnitude of reserve changes during the period. We believe that the exclusion of these items provides a better view of our results from our ongoing businesses.

We may at other times exclude certain other items from our discussion of financial ratios and metrics in order to enhance the understanding and comparability of our operational performance and the underlying fundamentals, but this exclusion is not an indication that similar items may not recur and does not replace net income or net loss as a measure of our overall profitability.

88

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2023

Note 10 - Segment Information - Continued

A reconciliation of total revenue to "adjusted operating revenue" and income before income tax to "adjusted operating income" is as follows:

	Three Months Ended September 30				Nine Months Ended September 30
	2023		2022		2023		2022
	(in millions of dollars)
Total Revenue	$	3,092.5	$	2,959.1	$	9,240.8	$	8,979.3
Excluding:
Net Investment Loss	(31.0)		(4.4)		(30.0)		(22.3)
Adjusted Operating Revenue	$	3,123.5	$	2,963.5	$	9,270.8	$	9,001.6
Income Before Income Tax	$	261.7	$	641.6	$	1,211.4	$	1,376.5
Excluding:
Net Investment Loss	(31.0)		(4.4)		(30.0)		(22.3)
Amortization of the Cost of Reinsurance	(11.1)		(11.8)		(33.1)		(38.5)
Non-Contemporaneous Reinsurance	(9.2)		(1.7)		(26.4)		(24.1)
Reserve Assumption Updates	(177.2)		243.3		(177.2)		243.3
Adjusted Operating Income	$	490.2	$	416.2	$	1,478.1	$	1,218.1

89

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2023

Note 11 - Employee Benefit Plans

Defined Benefit Pension and Other Postretirement Benefit (OPEB) Plans

We sponsor several defined benefit pension and OPEB plans for our employees, including non-qualified pension plans. The U.S. qualified and non-qualified defined benefit pension plans comprise the majority of our total benefit obligation and benefit cost. We maintain a separate defined benefit plan for eligible employees in our U.K. operation. The U.S. defined benefit pension plans were closed to new entrants on December 31, 2013, the OPEB plan was closed to new entrants on December 31, 2012, and the U.K. plan was closed to new entrants on December 31, 2002.

The following table provides the components of the net periodic benefit cost (credit) for the defined benefit pension and OPEB plans.

	Three Months Ended September 30
	Pension Benefits
	U.S. Plans				U.K. Plan				OPEB
	2023		2022		2023		2022		2023		2022
	(in millions of dollars)
Service Cost	$	2.3	$	1.9	$	—	$	—	$	—	$	—
Interest Cost	22.0		16.8		1.9		1.2		1.1		0.8
Expected Return on Plan Assets	(23.0)		(26.5)		(2.1)		(2.6)		(0.2)		(0.2)
Amortization of:
Net Actuarial (Gain) Loss	3.8		4.1		0.6		0.1		(2.6)		(0.2)
Prior Service Credit	—		—		—		—		—		(0.1)
Total Net Periodic Benefit Cost (Credit)	$	5.1	$	(3.7)	$	0.4	$	(1.3)	$	(1.7)	$	0.3

	Nine Months Ended September 30
	Pension Benefits
	U.S. Plans				U.K. Plan				OPEB
	2023		2022		2023		2022		2023		2022
	(in millions of dollars)
Service Cost	$	6.9	$	5.8	$	—	$	—	$	—	$	—
Interest Cost	66.0		50.4		5.7		3.8		3.4		2.3
Expected Return on Plan Assets	(69.1)		(79.5)		(6.3)		(8.3)		(0.4)		(0.4)
Amortization of:
Net Actuarial (Gain) Loss	11.4		12.2		1.9		0.3		(7.9)		(0.7)
Prior Service Credit	—		—		—		—		(0.1)		(0.2)
Total Net Periodic Benefit Cost (Credit)	$	15.2	$	(11.1)	$	1.3	$	(4.2)	$	(5.0)	$	1.0

The service cost component of net periodic pension and postretirement benefit cost (credit) is included as a component of compensation expense in our consolidated statements of income. All other components of net periodic pension and postretirement benefit cost (credit) are included in other expenses.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2023

Note 12 - Stockholders' Equity and Earnings Per Common Share

Earnings Per Common Share

Net income per common share is determined as follows:

	Three Months Ended September 30				Nine Months Ended September 30
	2023		2022		2023		2022
	(in millions of dollars, except share data)
Numerator
Net Income	$	202.0	$	510.3	$	953.2	$	1,118.0
Denominator (000s)
Weighted Average Common Shares - Basic	196,083.2		200,035.3		197,289.5		201,262.3
Dilution for Assumed Exercises of Nonvested Stock Awards	1,048.6		1,614.9		1,005.6		1,256.7
Weighted Average Common Shares - Assuming Dilution	197,131.8		201,650.2		198,295.1		202,519.0
Net Income Per Common Share
Basic	$	1.03	$	2.55	$	4.83	$	5.55
Assuming Dilution	$	1.02	$	2.53	$	4.81	$	5.52

We compute basic earnings per share by dividing net income by the weighted average number of common shares outstanding for the period. In computing earnings per share assuming dilution, we include potential common shares that are dilutive (those that reduce earnings per share). We use the treasury stock method to account for the effect of nonvested stock success units, nonvested restricted stock units, and nonvested performance share units on the computation of diluted earnings per share. Under this method, the potential common shares from nonvested stock success units and nonvested restricted stock units will each have a dilutive effect, as individually measured, when the average market price of Unum Group common stock during the period exceeds the grant price of the nonvested stock success units and nonvested restricted stock units. The outstanding nonvested stock success units and nonvested restricted stock units have grant prices ranging from $18.78 to $49.29. Potential common shares from performance based share units will have a dilutive effect as the attainment of performance conditions is progressively achieved during the vesting period. Potential common shares not included in the computation of diluted earnings per share because the impact would be antidilutive approximated a de minimis amount and 0.4 million potential common shares for the three and nine months ended September 30, 2023, respectively. There were a de minimis amount and 0.1 million potential common shares that were antidilutive for the three and nine months ended September 30, 2022, respectively.

Common Stock

As part of our capital deployment strategy, we may repurchase shares of Unum Group's common stock, as authorized by our board of directors. During December 2022, our board of directors authorized the repurchase of up to $200.0 million of Unum Group's outstanding common stock beginning January 1, 2023. In February 2023, our board of directors authorized an increase to the share repurchase program such that we are now authorized to repurchase up to $250.0 million of Unum Group's outstanding common stock. This share repurchase program has an expiration date of December 31, 2023, with the timing and amount of repurchase activity to be based on market conditions and other considerations, including the level of available cash, alternative uses for cash, and our stock price.

In October 2023, our board of directors authorized the repurchase of up to $500.0 million of Unum Group's outstanding common stock beginning on January 1, 2024. The repurchase program authorized in October 2023 has no scheduled termination date.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2023

Note 12 - Stockholders' Equity and Earnings Per Common Share - Continued

In August 2022, the Inflation Reduction Act was signed into law in the U.S. and, effective January 1, 2023, imposes a one percent excise tax on corporate stock repurchases after December 31, 2022. This excise tax is recorded as part of the cost basis of treasury stock and is assessed on the fair market value of stock repurchases reduced by the fair market value of any shares issued during the period.

Common stock repurchases, which are accounted for using the cost method and classified as treasury stock until otherwise retired, were as follows:

	Three Months Ended September 30				Nine Months Ended September 30
	2023		2022		2023		2022
	(in millions)
Shares Repurchased	1.5		1.2		3.9		4.2
Cost of Shares Repurchased1	$	74.8	$	42.6	$	175.4	$	137.5

1Includes a de minimis amount and $0.1 million of commissions for the three and nine months ended September 30, 2023, respectively, and a de minimis amount and $0.1 million of commissions for the three and nine months ended September 30, 2022, respectively. There was $0.7 million and $1.2 million of excise tax for the three and nine months ended September 30, 2023, respectively. There were no excise taxes during the three and nine months ended September 30, 2022.

As a part of our share repurchase program, we periodically enter into accelerated share repurchase agreements (ASR). Under the terms of these agreements, we make a prepayment to a financial counterparty for which we receive an initial delivery of approximately 75 percent of the total Unum Group common stock to be delivered under the agreement. We simultaneously enter into a forward contract indexed to the price of Unum Group common stock, which subjects the transactions to a future price adjustment. Under the terms of the agreements, we are to receive, or be required to pay, a price adjustment based on the volume weighted average price of Unum Group common stock during the term of the agreement, less a discount. Any price adjustment payable to us is settled in shares of Unum Group common stock. Any price adjustment we would be required to pay may be settled in either cash or common stock at our option. Details of our ASRs for the nine months ended September 30, 2023 and 2022 are as follows:

Prepayment Date	Prepayment Amount	Initial Share Delivery	Forward Contract Settlement Date	Shares Delivered to Settle Forward Contract
(in millions)
July 2023	$50.0	0.8	September 2023	0.2
February 2022	50.0	1.3	April 2022	0.4

As of September 30, 2023, the remaining repurchase amount under the current share repurchase program was $75.9 million.

Preferred Stock

Unum Group has 25.0 million shares of preferred stock authorized with a par value of $0.10 per share. No preferred stock has been issued to date.

Commitments

See Notes 3 and 4 for further discussion on certain of our investment commitments.

Contingent Liabilities

We are a defendant in a number of litigation matters that have arisen in the normal course of business, including the matters discussed below. Further, state insurance regulatory authorities and other federal and state authorities regularly make inquiries and conduct investigations concerning our compliance with applicable insurance and other laws and regulations. Given the complexity and scope of our litigation and regulatory matters, it is not possible to predict the ultimate outcome of all pending investigations or legal proceedings or provide reasonable estimates of potential losses, except if noted in connection with specific matters.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2023

Note 13 - Commitments and Contingent Liabilities - Continued

In some of these matters, no specified amount is sought. In others, very large or indeterminate amounts, including punitive and treble damages, are asserted. There is a wide variation of pleading practice permitted in the United States courts with respect to requests for monetary damages, including some courts in which no specified amount is required and others which allow the plaintiff to state only that the amount sought is sufficient to invoke the jurisdiction of that court. Further, some jurisdictions permit plaintiffs to allege damages well in excess of reasonably possible verdicts. Based on our extensive experience and that of others in the industry with respect to litigating or resolving claims through settlement over an extended period of time, we believe that the monetary damages asserted in a lawsuit or claim bear little relation to the merits of the case, or the likely disposition value. Therefore, the specific monetary relief sought is not stated.

Unless indicated otherwise in the descriptions below, reserves have not been established for litigation and contingencies. An estimated loss is accrued when it is both probable that a liability has been incurred and the amount of the loss can be reasonably estimated.

Claim Handling Matters

We and our insurance subsidiaries, in the ordinary course of our business, are engaged in claim litigation where disputes arise as a result of a denial or termination of benefits. Most typically these lawsuits are filed on behalf of a single claimant or policyholder, and in some of these individual actions punitive damages are sought, such as claims alleging bad faith in the handling of insurance claims. For our general claim litigation, we maintain reserves based on experience to satisfy judgments and settlements in the normal course. We expect that the ultimate liability, if any, with respect to general claim litigation, after consideration of the reserves maintained, will not be material to our consolidated financial condition. Nevertheless, given the inherent unpredictability of litigation, it is possible that an adverse outcome in certain claim litigation involving punitive damages could, from time to time, have a material adverse effect on our consolidated results of operations in a period, depending on the results of operations for the particular period.

From time to time class action allegations are pursued where the claimant or policyholder purports to represent a larger number of individuals who are similarly situated. Since each insurance claim is evaluated based on its own merits, there is rarely a single act or series of actions which can properly be addressed by a class action. Nevertheless, we monitor these cases closely and defend ourselves appropriately where these allegations are made.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2023

Note 14 - Other

Income Tax

In August 2022, the Inflation Reduction Act (IRA) was signed into law in the U.S. and includes certain corporate tax provisions effective January 1, 2023. The IRA imposes a new 15 percent corporate alternative minimum tax (CAMT) on adjusted financial statement income (AFSI) on corporations that have average AFSI over $1.0 billion in any prior three-year period, starting with years 2020 to 2022. We anticipate that our company will be an applicable corporation. We have not recorded any CAMT as of September 30, 2023. We do not expect that any CAMT incurred would impact earnings since it would be offset with a credit toward regular income tax in subsequent years.

Allowance for Expected Credit Losses on Premiums Receivable

At September 30, 2023, June 30, 2023, and December 31, 2022, the allowance for expected credit losses on premiums receivable was $29.7 million, $28.7 million, and $32.5 million, respectively, on gross premiums receivable of $626.6 million, $660.3 million, and $557.6 million, respectively. The increase in the allowance of $1.0 million during the three months ended September 30, 2023, was driven primarily by an increase in premium due to be collected in the Unum US and Colonial segments. The decrease of $2.8 million during the nine months ended September 30, 2023, was driven primarily by improvements in the age of premiums receivable.

At September 30, 2022, June 30, 2022, and December 31, 2021, the allowance for expected credit losses on premiums receivable was $31.4 million, $34.3 million, and $34.2 million, respectively, on gross premiums receivable of $561.1 million, $593.4 million, and $530.7 million, respectively. The decrease in the allowance of $2.9 million and $2.8 million during the three and nine months ended September 30, 2022, respectively, was driven primarily by an improvement in the age of premiums due to be collected. Also contributing to the decline in the allowance during the three months ended September 30, 2022 was a decline in the gross receivable balance.

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ITEM 2. MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

Executive Summary

Unum Group, a Delaware general business corporation, and its insurance and non-insurance subsidiaries, which collectively with Unum Group we refer to as the Company, operate in the United States, the United Kingdom, Poland, and, to a limited extent, in certain other countries. The principal operating subsidiaries in the United States are Unum Life Insurance Company of America (Unum America), Provident Life and Accident Insurance Company, The Paul Revere Life Insurance Company, Colonial Life & Accident Insurance Company, Starmount Life Insurance Company, in the United Kingdom, Unum Limited, and in Poland, Unum Zycie TUiR S.A. (Unum Poland). We are a leading provider of financial protection benefits in the United States and the United Kingdom. Our products include disability, life, accident, critical illness, dental and vision, and other related services. We market our products primarily through the workplace.

We have three principal operating business segments: Unum US, Unum International, and Colonial Life. Our other segments are the Closed Block and Corporate segments. These segments are discussed more fully under "Segment Results" included herein in this Item 2.

The benefits we provide help the working world thrive throughout life's moments and protect people from the financial hardship of illness, injury, or loss of life. As a leading provider of employee benefits, we offer a broad portfolio of products and services through the workplace that provide support when it is needed most.

Specifically, we offer group, individual, voluntary, and dental and vision products as well as provide certain fee-based services. These products and services, which can be sold stand-alone or combined with other coverages, help employers of all sizes attract and retain the talented and capable workforce they need to succeed while protecting the incomes and livelihood of their employees. We believe employer-sponsored benefits are the most effective way to provide workers with access to information and options to protect their financial stability. Working people and their families, particularly those at lower and middle incomes, are perhaps the most vulnerable in today's economy yet are often overlooked by many providers of financial products and services. For many of these people, employer-sponsored benefits are the primary defense against the potentially catastrophic fallout of death, illness, or injury.

We have established a corporate culture consistent with the social values our products provide. Because we see important links between the obligations we have to all of our stakeholders, we place a strong emphasis on operating with integrity and contributing to positive change in our communities. Accordingly, we are committed not only to meeting the needs of our customers who depend on us, but also to being accountable for our actions through sound and consistent business practices, a strong internal compliance program, a comprehensive risk management strategy, and an engaged employee workforce.

This discussion and analysis should be read in conjunction with the consolidated financial statements and notes thereto in Part I, Item 1 and Item 3 contained in this Form 10-Q and with the "Cautionary Statement Regarding Forward-Looking Statements" included below the Table of Contents, as well as the discussion, analysis, and consolidated financial statements and notes thereto in Part I, Items 1 and 1A, and Part II, Items 7, 7A, and 8 of our annual report on Form 10-K for the year ended December 31, 2022.

Prior period financial information has been adjusted to reflect our modified retrospective adoption, effective January 1, 2023, of the Accounting Standards Update (ASU) 2018-12, related to targeted improvements to the accounting for long-duration contracts. See "Accounting Developments" included herein in this Item 2 as well as Note 2 of the "Notes to Consolidated Financial Statements" contained herein in Item 1.

Operating Performance and Capital Management

For the third quarter of 2023, we reported net income of $202.0 million, or $1.02 per diluted common share, compared to net income of $510.3 million, or $2.53 per diluted common share, in the third quarter of 2022. For the first nine months of 2023, we reported net income of $953.2 million, or $4.81 per diluted common share, compared to net income of $1,118.0 million, or $5.52 per diluted common share in the same period of 2022.

Included in our results for the third quarter of 2023 are:

•A net investment loss of $31.0 million before tax and $24.4 million after tax, or $0.13 per diluted common share;

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•Amortization of the cost of reinsurance of $11.1 million before tax and $8.7 million after tax, or $0.04 per diluted common share;

•Non-contemporaneous reinsurance of $9.2 million before tax and $7.3 million after tax, or $0.04 per diluted common share; and

•A net reserve increase related to assumption updates of $177.2 million before tax and $139.3 million after tax, or $0.71 per diluted common share.

Included in our results for the first nine months of 2023 are:

•A net investment loss of $30.0 million before tax and $23.6 million after tax, or $0.12 per diluted common share;

•Amortization of the cost of reinsurance of $33.1 million before tax and $26.1 million after tax, or $0.13 per diluted common share;

•Non-contemporaneous reinsurance of $26.4 million before tax and $20.9 million after tax, or $0.11 per diluted common share; and

•A net reserve increase related to assumption updates of $177.2 million before tax and $139.3 million after tax, or $0.70 per diluted common share.

Included in our results for the third quarter of 2022 are:

•A net investment loss of $4.4 million before tax and $3.4 million after tax, or $0.02 per diluted common share;

•Amortization of the cost of reinsurance of $11.8 million before tax and $9.3 million after tax, or $0.04 per diluted common share;

•Non-contemporaneous reinsurance of $1.7 million before tax and $1.4 million after tax, or $0.01 per diluted common share; and

•A net reserve decrease related to assumption updates of $243.3 million before tax and $192.1 million after tax, or $0.95 per diluted common share.

Included in our results for the first nine months of 2022 are:

•A net investment loss of $22.3 million before tax and $17.1 million after tax, or $0.09 per diluted common share;

•Amortization of the cost of reinsurance $38.5 million before tax and $30.4 million after tax, or $0.14 per diluted common share;

•Non-contemporaneous reinsurance of $24.1 million before tax and $19.1 million after tax, or $0.10 per diluted common share; and

•A net reserve decrease related to assumption updates of $243.3 million before tax and $192.1 million after tax, or $0.95 per diluted common share.

Excluding these items, after-tax adjusted operating income for the third quarter of 2023 was $381.7 million, or $1.94 per diluted common share compared to $332.3 million, or $1.65 per diluted common share, for the same period of 2022. After-tax adjusted operating income was $1,163.1 million, or $5.87 per diluted common share, in the first nine months of 2023, compared to $992.5 million, or $4.90 per diluted common share, in the first nine months of 2022. See "Reconciliation of Non-GAAP and Other Financial Measures" contained herein in this Item 2 for a reconciliation of these items.

Our Unum US segment reported income before income tax and net investment gains and losses of $486.6 million and $1,142.2 million in the third quarter and first nine months of 2023, respectively, compared to $451.6 million and $911.8 million in the same periods of 2022, which includes the reserve assumption updates that occurred during the third quarters of 2023 and 2022. Excluding these items, our Unum US segment reported adjusted operating income of $357.8 million and $1,013.4 million in the third quarter and first nine months of 2023, respectively, compared to $280.8 million and $741.0 million in the same periods of 2022, due to favorable benefits experience primarily in our group long-term disability product line and an increase in premium income, partially offset by higher operating expenses. The benefit ratio, excluding the reserve assumption updates, for our Unum US segment was 59.1 percent and 59.9 percent in the third quarter and first nine months of 2023, respectively, compared to 63.8 percent and 66.6 percent in third quarter and first nine months of 2022, respectively. Unum US sales increased 8.5 percent and 18.1 percent in the third quarter and first nine months of 2023, respectively, compared to the same periods of 2022.

Our Unum International segment reported income before income tax and net investment gains and losses of $18.9 million and $100.8 million in the third quarter and first nine months of 2023 compared to $32.5 million and $86.5 million in the same periods of 2022, which includes the reserve assumption updates during the third quarters of 2023 and 2022. Excluding these items, our Unum International segment reported adjusted operating income, as measured in U.S. dollars, of $36.8 million and

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$118.7 million in the third quarter and first nine months of 2023, respectively, compared to $24.9 million and $78.9 million in the same periods of 2022. As measured in local currency, our Unum UK line of business reported adjusted operating income, which excludes the reserve assumption updates, of £28.4 million and £93.7 million in the third quarter and first nine months of 2023, respectively, compared to £23.3 million and £63.4 million in the same periods of 2022. As measured in local currency, the increase in adjusted operating income in the third quarter and first nine months of 2023 compared to the same periods of 2022 is primarily due to favorable benefits experience in the group long-term disability product and higher premium income, partially offset by lower net investment income and higher operating expenses. The benefit ratio for our Unum UK line of business, excluding the reserve assumption updates, was 67.4 percent and 69.4 percent in the third quarter and first nine months of 2023, respectively, compared to 78.7 percent and 82.6 percent in the same periods of 2022. Unum International sales, as measured in U.S. dollars, decreased 24.7 percent and increased 24.1 percent in the third quarter and first nine months of 2023, respectively, compared to the same periods of 2022. Unum UK sales, as measured in local currency decreased 41.1 percent and increased 15.4 percent in the third quarter and first nine months of 2023, respectively, relative to the same periods of 2022.

Our Colonial Life segment reported income before income tax and net investment gains and losses of $183.6 million and $393.0 million in the third quarter and first nine months of 2023, respectively, compared to $173.1 million and $372.6 million in the same periods of 2022, which includes the reserve assumption updates during the third quarters of 2023 and 2022. Excluding these items, our Colonial Life segment reported adjusted operating income of $102.9 million and $312.3 million in the third quarter and first nine months of 2023, respectively, compared to $117.9 million and $317.4 million in the same periods of 2022, primarily due to higher amortization of deferred acquisition costs, partially offset by higher premium income. Also impacting the comparison for the first nine months of 2023 are higher operating expenses, partially offset by favorable benefits experience. The benefit ratio, excluding the reserve assumption updates, for Colonial Life was 49.1 percent and 50.2 percent in the third quarter and first nine months of 2023, respectively, compared to 48.7 percent and 51.9 percent in the same periods of 2022. Colonial Life sales increased 4.7 percent and 3.5 percent in the third quarter and first nine months of 2023, respectively, compared to the same periods of 2022.

Our Closed Block segment reported a loss before income tax and net investment gains and losses of $354.9 million and $284.7 million in the third quarter and first nine months of 2023, respectively, compared to income before income tax and net investment gains and losses of $38.3 million and $154.7 million in the same periods of 2022, all of which include the amortization of the cost of reinsurance and the impact of non-contemporaneous reinsurance related to the Closed Block individual disability reinsurance transaction, as well as the reserve assumption updates. Excluding these items, our Closed Block segment reported adjusted operating income of $34.2 million and $143.6 million in the third quarter and first nine months of 2023, respectively, compared to $42.1 million and $207.6 million in the same periods of 2022. The interest adjusted loss ratio for long-term care, excluding reserve assumption updates, was unfavorable during the third quarter and first nine months of 2023 relative to the same periods of 2022.

A rising interest rate environment could continue to positively impact our yields on new investments but could also continue to create unrealized losses in our current holdings. As of September 30, 2023, we do not hold any securities with a decline in fair value below amortized cost which we intend to sell nor any securities for which it is more likely than not that we will be required to sell before recovery in amortized cost. The net unrealized loss on our fixed maturity securities was $4.2 billion at September 30, 2023, compared to $3.0 billion at December 31, 2022, with the increase due primarily to an increase in U.S. Treasury rates. The earned book yield on our investment portfolio was 4.45 percent for the first nine months of 2023 compared to a yield of 4.57 percent for full year 2022.

Additionally, a rising interest rate environment could result in reserve decreases specific to our liability for future policy benefits, as the reserve discount rate assumptions used in the calculation of our liability are updated at each reporting date using a yield that is reflective of an upper-medium grade fixed income instrument, which is generally equivalent to a single-A interest rate matched to the duration of certain of our insurance liabilities. The change in discount rate assumptions on the liability for future policy benefits, net of reinsurance, due primarily to the increase in U.S. Treasury rates during the first nine months of 2023, resulted in a decrease to the liability for future policy benefits, net of reinsurance, of approximately $1.7 billion.

We believe our capital and financial positions are strong. At September 30, 2023, the risk-based capital (RBC) ratio for our traditional U.S. insurance subsidiaries, calculated on a weighted average basis using the NAIC Company Action Level formula, was approximately 470 percent. We repurchased 3.9 million shares and 4.2 million shares of Unum Group common stock under our share repurchase program, during the first nine months of 2023 and 2022, respectively, at a cost of $175.4 million and $137.5 million, respectively. Our weighted average common shares outstanding, assuming dilution, equaled 197.1 million and 201.7 million for the third quarters of 2023 and 2022, respectively, and 198.3 million and 202.5 million for the first nine months of 2023 and 2022, respectively. As of September 30, 2023, Unum Group and our intermediate holding companies had available holding company liquidity of $1,182.0 million that was held primarily in bank deposits, commercial paper, money

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market funds, corporate bonds, municipal bonds and asset backed securities. See Note 12 of the "Notes to Consolidated Financial Statements" contained herein in Item 1.

2023 and 2022 Reserve Assumption Updates

During the third quarters of 2023 and 2022, we completed our annual cash flow assumption review and updated certain of our assumptions used to develop the liability for future policy benefits. For more information see "Critical Accounting Estimates" included herein in this Item 2.

Inflation Reduction Act

In August 2022, the Inflation Reduction Act (IRA) was signed into law in the U.S. and includes certain corporate tax provisions effective January 1, 2023. The IRA imposes a new 15 percent corporate alternative minimum tax (CAMT) on adjusted financial statement income (AFSI) on corporations that have average AFSI over $1.0 billion in any prior three-year period, starting with years 2020 to 2022. We anticipate that our company will be an applicable corporation. We have not recorded any CAMT as of September 30, 2023. We do not expect that any CAMT incurred would impact earnings since it would be offset with a credit toward regular income tax in subsequent years. The IRA also imposes a one percent excise tax on fair market value of corporate stock repurchases after December 31, 2022. This excise tax is recorded as part of the cost basis of treasury stock and is assessed on the fair market value of stock purchases, reduced by the fair value of any shares issued during the period. We have recorded $0.7 million and $1.2 million of excise tax in stockholders' equity, as part of the cost basis of treasury stock, for the third quarter and first nine months of 2023, respectively.

U.K. Tax Law Change

In June 2021, the Finance Act 2021 was enacted, resulting in a U.K. tax rate increase from 19 percent to 25 percent, effective April 1, 2023.

Coronavirus Disease 2019 (COVID-19)

COVID-19 has caused disruption to the global economy and has unfavorably impacted our company as well as the overall insurance industry. During 2022 and the first nine months of 2023, we experienced lower mortality in our life products lines, resulting primarily from lessening impacts of COVID-19 on our insured population when compared to pandemic levels. Due to the volatile and unprecedented nature of these events, we still cannot fully estimate the ultimate impact of the COVID-19 pandemic. We continue to closely monitor pandemic trends that have and may continue to have adverse impacts on our business.

Consolidated Company Outlook

We believe our strategy of providing financial protection products at the workplace puts us in a position of strength. We continue to fulfill our corporate purpose of helping the working world thrive throughout life’s moments by providing excellent service to people at their time of need. Our strategy remains centered on growing our core businesses, through investing and transforming our operations and technology to anticipate and respond to the changing needs of our customers, expanding into new adjacent markets through meaningful partnerships and effective deployment of our capital across our portfolio.

As the pandemic impacts have lessened, we have experienced recovery in our earnings driven by the underlying strength of our business and expect positive operating trends in our core businesses to continue in 2023, including improved claim experience. The products and services we provide delivered significant value to employers, employees and their families, throughout the COVID-19 pandemic and we believe this will help drive sales and premium growth in 2023.

The current interest rate environment could continue to positively impact our yields on new investments, but could also continue to create unrealized losses in our current holdings. We also may continue to experience further volatility in miscellaneous investment income primarily related to changes in partnership net asset values as well as bond calls.

As part of our discipline in pricing and reserving, we continuously monitor emerging claim trends and interest rates. We will continue to take appropriate pricing actions on new business and renewals that are reflective of the current environment and may continue to utilize derivative financial instruments to manage interest rate risk.

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Our business is well-diversified by geography within our markets, industry exposures and case size, and we continue to analyze and employ strategies that we believe will help us navigate the current environment. These strategies allow us to maintain financial flexibility to support the needs of our businesses, while also returning capital to our shareholders. We have strong core businesses that have a track record of generating significant free cash flow, and we will continue to invest in our operations and expand into adjacent markets where we can best leverage our expertise and capabilities to capture market growth opportunities as those opportunities emerge. We believe that consistent operating results, combined with the implementation of strategic initiatives and the effective deployment of capital, will allow us to meet our financial objectives.

Further discussion is included in "Reconciliation of Non-GAAP and Other Financial Measures," "Accounting Developments", "Consolidated Operating Results," "Segment Results," "Investments," and "Liquidity and Capital Resources" contained herein in this Item 1 and in the "Notes to Consolidated Financial Statements" contained herein in Item 2.

Reconciliation of Non-GAAP and Other Financial Measures

We analyze our performance using non-GAAP financial measures. A non-GAAP financial measure is a numerical measure of a company's performance, financial position, or cash flows that excludes or includes amounts that are not normally excluded or included in the most directly comparable measure calculated and presented in accordance with U.S. generally accepted accounting principles (GAAP). The non-GAAP financial measure of "after-tax adjusted operating income" differs from net income as presented in our consolidated operating results and income statements prepared in accordance with GAAP due to the exclusion of investment gains or losses, the amortization of the cost of reinsurance, the impact of non-contemporaneous reinsurance, and reserve assumption updates as specified in the reconciliations below. Investment gains or losses primarily include realized investment gains or losses, expected investment credit losses, and gains or losses on derivatives. We believe after-tax adjusted operating income is a better performance measure and better indicator of the profitability and underlying trends in our business.

Investment gains or losses depend on market conditions and do not necessarily relate to decisions regarding the underlying business of our segments. Our investment focus is on investment income to support our insurance liabilities as opposed to the generation of investment gains or losses. Although we may experience investment gains or losses which will affect future earnings levels, a long-term focus is necessary to maintain profitability over the life of the business since our underlying business is long-term in nature, and we need to earn the interest rates assumed in calculating our liabilities.

Cash flow assumptions used to calculate our liability for future policy benefits are reviewed at least annually and updated, as needed, with the resulting impact reflected in net income. While the effects of these assumption updates are recorded in the reporting period in which the review is completed, these updates reflect experience emergence and changes to expectations spanning multiple periods. We believe that by excluding the impact of reserve assumption updates we are providing a more comparable and consistent view of our quarterly results.

We exited a substantial portion of our Closed Block individual disability product line through the two phases of the reinsurance transaction that were executed in December 2020 and March 2021. As a result, we exclude the amortization of the cost of reinsurance that we recognized upon the exit of the business related to the policies on claim status as well as the impact of non-contemporaneous reinsurance that resulted from the adoption of ASU 2018-12. Due to the execution of the second phase of the reinsurance transaction occurring after January 1, 2021, the transition date of ASU 2018-12, in accordance with the provisions of the ASU related to non-contemporaneous reinsurance, we were required to establish the ceded reserves using an upper-medium grade fixed-income instrument as of the reinsurance transaction date in March 2021 which resulted in higher ceded reserves compared to that which was reported historically. However, the direct reserves for the block reinsured in the second phase were calculated using the original discount rate utilized as of the transition date. Both the direct and ceded reserves are then remeasured at each reporting period using a current discount rate reflective of an upper-medium grade fixed-income instrument, with the changes recognized in OCI. While the total equity impact is neutral, the different original discount rates utilized for direct and ceded reserves result in disproportionate earnings impacts. The impact of non-contemporaneous reinsurance will fluctuate depending on the magnitude of reserve changes during the period. We believe that the exclusion of these items provides a better view of our results from our ongoing businesses.

We may at other times exclude certain other items from our discussion of financial ratios and metrics in order to enhance the understanding and comparability of our operational performance and the underlying fundamentals, but this exclusion is not an indication that similar items may not recur and does not replace net income or net loss as a measure of our overall profitability.

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A reconciliation of GAAP financial measures to our non-GAAP financial measures is as follows:

	Three Months Ended September 30
	2023				2022
	(in millions)		per share *		(in millions)		per share *
Net Income	$	202.0	$	1.02	$	510.3	$	2.53
Excluding:
Net Investment Loss (net of tax benefit of $6.6; $1.0)	(24.4)		(0.13)		(3.4)		(0.02)
Amortization of the Cost of Reinsurance (net of tax benefit of $2.4; $2.5)	(8.7)		(0.04)		(9.3)		(0.04)
Non-Contemporaneous Reinsurance (net of tax benefit of $1.9; $0.3)	(7.3)		(0.04)		(1.4)		(0.01)
Reserve Assumption Updates (net of tax expense (benefit) of $(37.9); $51.2)	(139.3)		(0.71)		192.1		0.95
After-tax Adjusted Operating Income	$	381.7	$	1.94	$	332.3	$	1.65
*Assuming Dilution

	Nine Months Ended September 30
	2023				2022
	(in millions)		per share *		(in millions)		per share *
Net Income	$	953.2	$	4.81	$	1,118.0	$	5.52
Excluding:
Net Investment Loss (net of tax benefit of $6.4; $5.2)	(23.6)		(0.12)		(17.1)		(0.09)
Amortization of the Cost of Reinsurance (net of tax benefit of $7.0; $8.1)	(26.1)		(0.13)		(30.4)		(0.14)
Non-Contemporaneous Reinsurance (net of tax benefit of $5.5; $5.0)	(20.9)		(0.11)		(19.1)		(0.10)
Reserve Assumption Updates (net of tax expense (benefit) of $(37.9); $51.2)	(139.3)		(0.70)		192.1		0.95
After-tax Adjusted Operating Income	$	1,163.1	$	5.87	$	992.5	$	4.90
* Assuming Dilution

We measure and analyze our segment performance on the basis of "adjusted operating revenue" and "adjusted operating income" or "adjusted operating loss", which differ from total revenue and income before income tax as presented in our consolidated statements of income due to the exclusion of investment gains and losses, the amortization of the cost of reinsurance, the impact of non-contemporaneous reinsurance, and reserve assumption updates as specified in the reconciliations below. These performance measures are in accordance with GAAP guidance for segment reporting, but they should not be viewed as a substitute for total revenue, income before income tax, net income or net loss.

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A reconciliation of total revenue to "adjusted operating revenue" and income before income tax to "adjusted operating income" is as follows:

	Three Months Ended September 30				Nine Months Ended September 30
	2023		2022		2023		2022
	(in millions of dollars)
Total Revenue	$	3,092.5	$	2,959.1	$	9,240.8	$	8,979.3
Excluding:
Net Investment Loss	(31.0)		(4.4)		(30.0)		(22.3)
Adjusted Operating Revenue	$	3,123.5	$	2,963.5	$	9,270.8	$	9,001.6
Income Before Income Tax	$	261.7	$	641.6	$	1,211.4	$	1,376.5
Excluding:
Net Investment Loss	(31.0)		(4.4)		(30.0)		(22.3)
Amortization of the Cost of Reinsurance	(11.1)		(11.8)		(33.1)		(38.5)
Non-Contemporaneous Reinsurance	(9.2)		(1.7)		(26.4)		(24.1)
Reserve Assumption Updates	(177.2)		243.3		(177.2)		243.3
Adjusted Operating Income	$	490.2	$	416.2	$	1,478.1	$	1,218.1

Critical Accounting Estimates

We prepare our financial statements in accordance with GAAP. The preparation of financial statements in conformity with GAAP requires us to make estimates and assumptions that affect amounts reported in our financial statements and accompanying notes. Estimates and assumptions could change in the future as more information becomes known, which could impact the amounts reported and disclosed in our financial statements.

The accounting estimates deemed to be most critical to our financial position and results of operations are those related to the liability for future policy benefits, deferred acquisition costs, valuation of investments, pension and postretirement benefit plans, income taxes, and contingent liabilities. The critical accounting estimates for which there were significant changes during the nine months ended September 30, 2023 due to the adoption of ASU 2018-12, are included below. For additional information on the accounting estimates for which there was not a significant change during the nine months ended September 30, 2023, refer to the discussion under "Critical Accounting Estimates" in Part II, Item 7 of our annual report on Form 10-K for the year ended December 31, 2022.

Liability for Future Policy Benefits

Liabilities for future policy benefits represent the cost of claims that we estimate we will eventually pay to our policyholders and the related expenses for our non interest-sensitive products. Liability for future policy benefits includes policy liabilities for claims not yet incurred and for claims that have been incurred or are estimated to have been incurred but not yet reported to us. Liability for future policy benefits equaled $36.5 billion and $38.6 billion at September 30, 2023 and December 31, 2022, respectively, or approximately 72.5 percent and 73.6 percent of our total liabilities, respectively. Liability for future policy benefits ceded to reinsurers was $7.5 billion and $8.1 billion at September 30, 2023 and December 31, 2022, respectively, and are reported as a reinsurance recoverable in our consolidated balance sheets.

Liabilities for future policy benefits are initially established in the same period in which we issue a policy, and equal the difference between projected future policy benefits and projected future premiums, allowing a margin for expenses and profit. The liabilities for future policy benefits build up and release over time, based on the emergence of cash flows, including premiums received and claims paid, and updated expectations for future cash flows.

Liabilities for future policy benefits are updated at each reporting date to reflect changes in the liability based on policy development over time, emerging experience, and any assumption updates required to maintain the best estimate basis for expected future cash flows as required by GAAP. These future policy benefit liabilities are based on actual known facts regarding the liability, such as the benefits available under the applicable policy, the covered benefit period, the age, and, as appropriate, the occupation and cause of disability of the claimant, as well as assumptions derived from our actual historical experience and expected future changes in experience for factors such as the claim duration, claim administration expenses,

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discount rate, policy benefit offsets, including those for social security and other government-based welfare benefits. The liability for future policy benefits also includes the liabilities for incurred claims.

Future policy benefit liabilities primarily relate to our traditional long-duration products which include our group, individual disability and certain of our voluntary benefits products in our Unum US segment; group, individual disability and life products in our Unum International segment; certain of our voluntary benefits products in our Colonial Life segment; and long-term care and certain of our other products in our Closed Block segment.

In calculating the liability for future policy benefits, our long-duration contracts are grouped into cohorts by product type and contract issue year. Liabilities for future policy benefits for claims not yet incurred are generally determined using the net premium model as prescribed by GAAP. At each reporting period, the liability for future policy benefits is remeasured at the current discount rate with the change recorded in other comprehensive income.

The calculation of the liability for future policy benefits involves numerous assumptions including discount rate, lapses, mortality, and morbidity. Certain product lines may utilize additional assumptions in calculating the liability for future policy benefits in addition to those listed above such as premium rate increases for long-term care, benefit offsets for long-term disability, and claim costs for voluntary benefits. Claim costs capture the combined effect of the incidence rate, the expected level of benefit to be paid, and the claim resolution rate. Cash flow assumptions are reviewed and updated, as needed, at least annually. Assumptions may be updated more frequently if necessary based on trending experience.

On a quarterly basis, cohort level cash flow measures are updated based on the emergence of actual experience. The updated cash flows, based on experience emergence and any assumption updates, are used to determine the updated net premiums, the portion of the gross premium required to provide for all benefits and expenses, excluding acquisition costs or any costs that are required to be charged to expense as incurred. The updated net premium ratio is used to calculate the updated liability for future policy benefits as of the beginning of year, at the original discount rate. To the extent the present value of future benefits and expenses exceeds the present value of future gross premiums, an immediate charge is recognized in net income, such that net premiums are set equal to gross premiums. Future policy benefit liabilities are floored at zero at the cohort level in situations where the liabilities for future policy benefits are less than zero. The change in the liability for future policy benefits, at the original discount rate, as of the beginning of the period, resulting from cash flow changes is reflected as the change in benefits - remeasurement gain or loss in the consolidated statements of income. The impact of all other changes in the liability for future policy benefits are reflected as policy benefits in the consolidated statements of income.

Key Assumptions

The calculation of the liability for future policy benefits involves numerous assumptions, but the primary assumptions used to calculate the liability are (1) the discount rate, (2) the claim resolution rate, (3) the claim incidence rate, and (4) policyholder mortality and lapses:

1.The discount rate, which is used in calculating the liability for future policy benefits, is the interest rate that we use to discount future cash flows including premium and claim payments to determine the present value. A higher discount rate produces a lower reserve. If the discount rate is higher than our future investment returns, our invested assets will not earn enough investment income to support our future claim payments. The original discount rates are initially set at the transition date of ASU 2018-12, which was January 1, 2021, for policies originally issued on or before the transition date, or at the policy issuance date, for policies issued after the transition date. For policies issued after the transition date, the original discount rate assumptions reflect an upper-medium grade (low-credit risk) fixed-income instrument yield based on the currency in which the liabilities are assumed. For all cohorts, the liability is then remeasured at each reporting period using the current discount rate reflective of an upper-medium grade fixed-income instrument. We primarily utilize a forward curve which is derived from the underlying spot curve using interpolation to develop an ultimate forward rate.

2.The claim resolution rate is the probability that a disability or long-term care claim will close due to recovery or death of the insured. It is important because it is used to estimate how long benefits will be paid for a claim. Estimated resolution rates that are set too high will result in liabilities that are lower than they need to be to pay the claim benefits over time. Claim resolution assumptions involve many factors, including the cause of disability, the policyholder's age, the type of contractual benefits provided, and the time since initial disability. We primarily use our own claim experience to develop our claim resolution assumptions. These assumptions are established for the probability of death and the probability of recovery from disability. Our studies incorporate actual claim resolution

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experience over a number of years and consider any observed trends over the study period. We also consider any expected future changes in claim resolution experience.

3.The incidence rate is the rate at which new claims are submitted to us. The incidence rate is affected by many factors, including the age of the insured, the insured's occupation or industry, the benefit plan design, and certain external factors such as consumer confidence and levels of unemployment. We establish our incidence assumption using a historical review of actual incidence results along with an outlook of future incidence expectations.

4.Policyholder lapse and mortality assumptions reflect the probability that insureds’ coverage is discontinued due to lapsation or death of the insured. For our life insurance products, mortality assumptions also reflect the probability that a benefit payment occurs. These rates are affected by many factors, including the age of the insured, the insured's occupation or industry, the benefit plan design, and the length of time from policy or certificate issue to valuation date. We establish our mortality and lapse assumptions using a historical review of actual results along with an outlook of future expectations.

Establishing liability for future policy benefit assumptions is complex and involves many factors. Liabilities for future policy benefits, particularly for policies offering insurance coverage for long-term disabilities and long-term care, are dependent on numerous assumptions other than just those presented in the preceding discussion. The impact of internal and external events, such as changes in claims operational procedures, economic trends such as the rate of unemployment and the level of consumer confidence, the emergence of new diseases, new trends and developments in medical treatments, and legal trends and legislative changes, including changes to social security and other government-based welfare benefits programs which provide policy benefit offsets, among other factors, will influence claim incidence rates, claim resolution rates, and claim costs. In addition, for policies offering coverage for disability or long-term care at advanced ages, the level and pattern of mortality rates at advanced ages will impact overall benefit costs. Reserve assumptions differ by product line and by policy type within a product line. Additionally, in any period and over time, our actual experience may have a positive or negative variance from our long-term assumptions, either singularly or collectively, and these variances may offset each other. We review our assumptions at least annually with a long-term view of our expected experience over the life of a block of business rather than test just one or a few assumptions independently that may be aberrant over a short period of time. Based on this review, we update our assumptions to reflect our current best estimates. Therefore, while it is possible to evaluate the sensitivity of overall results in our liability for future policy benefits based upon a change in each individual assumption, the actual impacts of changes to a variety of underlying assumptions must be considered in the aggregate by product line in order to judge the overall potential implications to the liability for future policy benefits. The following sections present the impacts of our most recent cash flow assumption reviews and an overview of our trend analysis for key assumptions and the results of variability in our assumptions, in aggregate, for the liabilities for future policy benefits which we believe are reasonably possible to have a material impact on our future financial results if actual claims yield a materially different amount than what we currently expect and have reserved for, either favorable or unfavorable.

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Cash Flow Assumption Review

Our cash flow assumption reviews during the first nine months of September 30, 2023 and the years ended December 31, 2022 and 2021 resulted in the following impacts to income before income tax as a result of updating certain assumptions related to the liability for future policy benefits:

	September 30		December 31
	2023		2022		2021
	(in millions of dollars)
Cash Flow Assumption Update Impacts to Income Before Income Tax
Unum US
Group Disability	$	121.0	$	121.0	$	215.0
Group Life and Accidental Death and Dismemberment	—		34.0		—
Individual Disability	(2.6)		(1.2)		4.5
Voluntary Benefits	10.4		17.0		12.2
Total Unum US	128.8		170.8		231.7
Unum International	(17.9)		7.6		4.2
Colonial Life	80.7		55.2		23.5
Closed Block
Long-term Care	(368.1)		2.9		(24.4)
Closed Block - All Other	(0.7)		6.8		—
Total Closed Block	(368.8)		9.7		(24.4)
Total	$	(177.2)	$	243.3	$	235.0

2023 Significant Cash Flow Assumption Updates:

The cash flow assumption updates in our Unum US group long-term disability product line reduced our liability for future policy benefits by $121.0 million, due primarily to sustained improvement in claim recovery trends since our last assumption update.

The cash flow assumption updates in our Colonial Life segment reduced our liability for future policy benefits by $80.7 million, due primarily to improvement in certain of our claim cost assumptions and increased policyholder lapse rates since our last assumption update.

The cash flow assumption updates in our Closed Block segment were primarily driven by the long-term care product line which increased our liability for future policy benefits by $368.1 million, due primarily to lower expectations for active policy lapse and mortality assumptions, partially offset by an increase to expected future premium rate increases.

2022 Significant Cash Flow Assumption Updates:

The cash flow assumption updates in our Unum US group long-term disability product line and our waiver of premium benefits for our Unum US group life product line reduced our liability for future policy benefits by $121.0 million and $34.0 million, respectively, due primarily to sustained improvement in claim recovery trends since our last assumption update, partially offset by lower social security benefit offsets for our group long-term disability product line.

The cash flow assumption updates in our Colonial Life segment reduced our liability for future policy benefits by $55.2 million, due primarily to improvement in certain of our claim cost assumptions since our most recent assumption update.

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The cash flow assumption updates in our Closed Block segment were primarily driven by the all other product line. The impact to net income before tax for this product line was $6.8 million and related to the small block of retained individual disability business. However, there were also updates to the mortality assumptions for the advanced age portion of our individual disability claimant population which was included in the block ceded as a part of the Closed Block individual disability reinsurance transaction with Commonwealth Annuity and Life Insurance Company. We increased our liability for future policy benefits by $196.0 million as a result of the assumption updates related to the ceded advanced age claimant block with a corresponding increase in our consolidated balance sheet as a reinsurance recoverable.

2021 Significant Cash Flow Assumption Updates:

The cash flow assumption updates in our Unum US group long-term disability product line reduced our liability for future policy benefits by $215.0 million, due primarily to sustained improvement in claim recovery trends since our last assumption update.

Trends in Key Assumptions

Generally, we do not expect our mortality and morbidity claim incidence trends or our persistency trends to change significantly in the short-term, and to the extent that these trends do change, we expect those changes to be gradual over a longer period of time. We have historically experienced an increase in our group long-term disability morbidity claim incidence trends during and following a recessionary period and believe claim incidence trends may continue to somewhat follow general economic conditions and demographics of the general workforce.

Regarding the 2020 COVID-19 pandemic and the related impact on the social and economic environment, we experienced elevated mortality and disability claim incidence rates during 2020 and 2021. Our view on our long-term mortality and morbidity expectations has not been impacted by this limited experience.

Generally, we do not expect our persistency trends to change significantly in the short-term, and to the extent that these trends do change, we expect those changes to be gradual over a longer period of time.

The long-term discount rates underlying the majority of our liabilities are reflective of rates based on the issue year of the cohort or rates underlying the liabilities at transition to the updated accounting basis as prescribed by ASU 2018-12. The discount rate assumption for new cohorts, after the transition date, is based on the interest rate of an upper-medium grade fixed-income instrument for that cohort period.

Our claim resolution rate assumption used in determining the liability for future policy benefits is our expectation of the resolution rate we will experience over the life of the block of business and will vary from actual experience in any one period, both favorably and unfavorably. Claim resolution rates are very sensitive to operational and environmental changes and have a greater chance of significant variability in a shorter period of time than our other reserve assumptions. These rates are reviewed on a quarterly basis for the death and recovery components separately. While claim resolution rates in our Unum US group long-term disability product line have shown some variability over the last several years, they have exhibited an increasing trend.

Sensitivity Analysis

We monitor our key assumptions and test the sensitivity of our liability for future policy benefits under a range of scenarios. This sensitivity analysis is completed at least annually and was initially completed as of December 31, 2022 for our product lines with a higher level of estimation uncertainty and utilizes the liability for future policy benefits valued at the original discount rate. See "Quantitative and Qualitative Disclosures about Market Risk" contained herein in Item 3 for information regarding the sensitivity of the current discount rate used to remeasure the liability for future policy benefits at each reporting date.

In our estimation, scenarios based on certain variations in each of our assumptions for our Unum US group long-term disability product line could produce a change of approximately $100 million which represents 1.8 percent of our Unum US group disability liability for future policy benefits balance. Of the assumptions impacting the estimated change in the liability for future policy benefits, the largest contributor is the claim resolution rate for which we assumed a change of approximately 10 percent.

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In our estimation, scenarios based on certain variations in each of our assumptions for our Unum US voluntary benefits product line could produce a change of approximately $15 million which represents 1.3 percent of our Unum US voluntary benefits liability for future policy benefits balance. Of the assumptions impacting the estimated change in the liability for future policy benefits, the largest contributor is the claim costs for which we assumed a change of approximately 10 percent.

In our estimation, scenarios based on certain possible variations in each of our assumptions for our Colonial Life segment could produce a change of approximately $60 million which represents 3.2 percent of our Colonial Life liability for future policy benefits balance. Of the assumptions impacting the estimated change in the liability for future policy benefits, the largest contributor is the claim costs, for which we assumed a change of approximately 10 percent.

We also consider variability in our assumptions related to the long-term care liability for future policy benefits. In our estimation, scenarios based on certain variations in each of our assumptions could produce potential results as illustrated in the chart below. The liability for future policy benefits for long-term care is based upon a number of key assumptions, and each assumption has various factors which may impact the long-term outcome. Key assumptions with respect to active policy lapses and mortality, claim incidence and resolutions, and future premium rate increases must incorporate extended views of expectations for many years into the future. The liability for future policy benefits is highly sensitive to these estimates. Key assumptions and related impacts are also heavily interrelated in both their outcome and in their effects on the liability for future policy benefits. For example, changes in the view of morbidity and mortality might be mitigated by either potential future premium rate increases and/or morbidity improvements due to general improvement in health and/or medical breakthroughs. There is a potentially wide range of outcomes for each assumption and in totality. As a result, and given the size of the long-term care liability for future policy benefits in relation to the total liability for future policy benefits, our sensitivity analysis for long-term care reflects the potential impact to the present value of gross liability cash flows for future policy benefits for updates to our key assumptions. The sensitivity analysis related to our key assumptions for the long-term care liability for future policy benefits is as shown below. The impact of changes to these assumptions would partially be reflected in the period in which the assumptions are updated and partially across future periods. Given the significant changes in certain assumptions, the below sensitivity analysis was completed as of the beginning of the third quarter of 2023 at which point the most recent assumption update review occurred.

			PV Gross LFPB Cash Flows1
Long-Term Care Cash Flow Assumptions	Sensitivity		Unfavorable		Favorable
			(in millions of dollars)
Active Policy Lapses and Mortality	7.5	%	$	470	$	440
Claim Incidence	3.0	%	400		410
Claim Resolutions	2.0	%	290		280
Morbidity/Mortality Improvement2	No Improvement/2x		1,050		1,080
Future Unapproved Premium Rate Increases	10.0	%	150		150
1Present value of cash flows specific to the LFPB at original discount rate, except using gross premiums instead of net premiums.
2Unfavorable scenario reflects no future improvement. Favorable scenario reflects improvement rates, from the valuation date forward, twice as high as baseline.

The impact to current period liability for future benefits would be smaller in magnitude than the present value of gross liability for future policy benefits cash flows due to the updating of the net premium ratio. The current period liability for future policy benefits impact may be asymmetrical (i.e. larger for the unfavorable scenario) for some sensitivities if the assumption update causes the net premium ratio to be capped at 100 percent for any given cohort.

We believe that these sensitivities provide a reasonable estimate of the possible changes in liability for future policy benefit balances for those product lines where we believe it is possible that variability in the assumptions, in the aggregate, could result in a material impact on our liability for future policy benefit levels, but we record our liability for future policy benefits based on our long-term best estimate for our cohorts and these assumptions are reviewed and updated annually to reflect the current best estimates. Product lines that have long-term claim payout periods have a greater potential for significant variability in claim costs, either positive or negative. We closely monitor emerging experience and use these results to inform our view of long-term assumptions.

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Deferred Acquisition Costs (DAC)

DAC represents the deferred incremental direct costs associated with the successful acquisition of new or renewal insurance contracts. Such costs include commissions, other agency compensation, certain selection and policy issue expenses, and certain field expenses. Acquisition costs that do not vary with the production of new business, such as commissions on group products which are generally level throughout the life of the policy, are excluded from the deferral. The DAC balance equaled $2,668.7 million and $2,560.0 million at September 30, 2023 and December 31, 2022 respectively, or approximately 4.5 percent and 4.2 percent of our total assets, respectively.

Generally, we do not expect our key assumptions for DAC to change significantly in the short-term, and to the extent that these trends do change, we expect those changes to be gradual over a longer period of time.

Certain of the policy issue expenses include employee costs resulting from time spent on acquisition activities that result in the sale or renewal of policies, including selling and underwriting. The estimates of time spent on the successful acquisition of new or renewal business are reviewed and updated, as needed, at least annually. There were no significant changes in these assumptions during the years ended December 31, 2022 or 2021 or the nine months ended September 30, 2023.

The lapse and mortality assumptions used to amortize DAC for our traditional long-duration products are consistent with the assumptions used to estimate the liability for future policy benefits. The underlying assumptions used to determine DAC amortization are updated concurrently with any related assumption changes for the liability for future policy benefits and changes in estimates are recognized prospectively over the remaining expected term of the related contracts. Amortization expense is adjusted based on actual versus expected experience through an adjustment to the prospective rate of amortization.

During the third quarter of 2023, we updated our policyholder lapse and mortality assumptions used to develop the future amortization for DAC for the Unum US voluntary benefits product lines and the Colonial Life segment. During the years ended December 31, 2022 and 2021, we updated our policyholder lapse and mortality assumptions used to develop the future amortization for DAC for the Unum US individual disability and voluntary benefits product lines as well as for the Colonial Life segment. These assumption updates were updated consistent with the related assumption updates for the corresponding liabilities for future policy benefits.

See Note 9 of the "Notes to Consolidated Financial Statements" contained herein in Item 1 for further discussion of our DAC accounting policy and DAC rollforward.

Accounting Developments

In 2018, the Financial Accounting Standards Board issued ASU 2018-12, “Targeted Improvements to the Accounting for Long-Duration Contracts”. This update significantly amended the accounting and disclosure requirements for long-duration insurance contracts. The update was effective for periods beginning January 1, 2023. We adopted this guidance effective January 1, 2023 using the modified retrospective approach with changes applied as of January 1, 2021, also referred to as the transition date. We adjusted all prior period operating results, balance sheets, and related metrics throughout this document.

See Note 2 of the "Notes to Consolidated Financial Statements" contained herein in Item 1 for further information.

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Consolidated Operating Results

(in millions of dollars)
	Three Months Ended September 30						Nine Months Ended September 30
	2023		% Change		2022		2023		% Change		2022
Revenue
Premium Income	$	2,525.9	5.7	%	$	2,388.9	$	7,494.3	4.0	%	$	7,206.3
Net Investment Income	526.0		2.8		511.6		1,565.9		(2.0)		1,597.8
Net Investment Loss	(31.0)		N.M		(4.4)		(30.0)		34.5		(22.3)
Other Income	71.6		13.7		63.0		210.6		6.6		197.5
Total Revenue	3,092.5		4.5		2,959.1		9,240.8		2.9		8,979.3
Benefits and Expenses
Policy Benefits	1,778.6		(3.5)		1,843.2		5,498.6		(3.4)		5,691.9
Policy Benefits - Remeasurement Loss (Gain)	168.4		149.3		(341.7)		(61.6)		(87.1)		(476.1)
Commissions	289.7		6.7		271.5		869.7		6.2		819.1
Interest and Debt Expense	48.6		3.4		47.0		145.6		3.0		141.3
Cost Related to Early Retirement of Debt	—		(100.0)		4.2		—		(100.0)		4.2
Deferral of Acquisition Costs	(153.3)		10.0		(139.4)		(467.5)		11.5		(419.1)
Amortization of Deferred Acquisition Costs	129.1		25.5		102.9		358.7		14.6		313.0
Compensation Expense	297.9		4.2		285.9		867.3		9.2		794.1
Other Expenses	271.8		11.4		243.9		818.6		11.5		734.4
Total Benefits and Expenses	2,830.8		22.1		2,317.5		8,029.4		5.6		7,602.8
Income Before Income Tax	261.7		(59.2)		641.6		1,211.4		(12.0)		1,376.5
Income Tax Expense	59.7		(54.5)		131.3		258.2		(0.1)		258.5
Net Income	$	202.0	(60.4)		$	510.3	$	953.2	(14.7)		$	1,118.0

Fluctuations in exchange rates, particularly between the British pound sterling and the U.S. dollar for our U.K. operations, have an effect on our consolidated financial results. In periods when the pound weakens relative to the preceding period, translating pounds into dollars decreases current period results relative to the prior period. In periods when the pound strengthens, translating pounds into dollars increases current period results relative to the prior period.

The weighted average pound/dollar exchange rate for our Unum UK line of business was 1.281 and 1.157 for the three months ended September 30, 2023 and 2022, and 1.243 and 1.237 for the nine months ended September 30, 2023 and 2022, respectively. If the 2022 results for our U.K. operations had been translated at the weighted average exchange rates of 2023, our adjusted operating revenue would have been approximately $17 million higher and generally consistent, respectively, in the third quarter and first nine months of 2022 and our adjusted operating income would have been approximately $3 million higher and generally consistent, respectively, for the third quarter and first nine months of 2022. However, it is important to distinguish between translating and converting foreign currency. Except for a limited number of transactions, we do not actually convert pounds into dollars. As a result, we view foreign currency translation as a financial reporting item and not a reflection of operations or profitability in the U.K.

Premium income increased in each of our principal operating segments in the third quarter and first nine months of 2023 compared to the same periods of 2022, primarily due to in-force block growth and higher overall sales. Premium income continues to decline, as expected, in our Closed Block segment.

Net investment income was higher during the third quarter of 2023 compared to the same period of 2022 due to growth in the yield on invested assets, a higher level of invested assets, and higher miscellaneous investment income, primarily related to larger increases in the net asset values (NAV) on our private equity partnerships, partially offset by lower investment income from inflation index-linked bonds held by Unum UK. Net investment income was lower during the first nine months of 2023 compared to the same period of 2022 due to lower miscellaneous investment income, primarily related to smaller increases in

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the NAV on our private equity partnerships, and lower investment income from inflation index-linked bonds held by Unum UK, partially offset by a higher level of invested assets and an increased yield on invested assets.

We did not recognize any credit losses on fixed maturity securities during the third quarter or first nine months of 2023. Credit losses on fixed maturity securities were $0.5 million and $4.6 million during the third quarter and first nine months of 2022. During the third quarter of 2023, we sold over $700 million of shorter duration bonds in our long-term care portfolio and reinvested the proceeds in higher quality, higher yielding, and longer duration bonds that better match our liability cash flows. We realized approximately $35 million of investment losses as a result of these sales. Also included in net investment gains and losses were changes in the fair value of an embedded derivative in a modified coinsurance arrangement, which resulted in investment gains of $9.2 million and $14.9 million in the third quarters of 2023 and 2022, respectively, and $14.7 million and $10.7 million in the first nine months of 2023 and 2022, respectively. The changes in the embedded derivative are primarily driven by movements in credit spreads in the overall investment market. See Note 4 in the "Notes to Consolidated Financial Statements" contained herein in Item 1 for further information on investment gains and losses.

Other income is primarily comprised of fee-based service products in the Unum US segment, which include leave management services and administrative services only business, and the underlying results and associated net investment income of certain assumed blocks of reinsured business in the Closed Block segment.

Overall benefits experience was unfavorable and generally consistent, respectively, in the third quarter and first nine months of 2023 relative to the same periods of 2022. The consolidated benefit ratio, which includes the remeasurement gain or loss, was 77.1 percent and 72.5 percent in the third quarter and first nine months of 2023, respectively, compared to 62.9 percent and 72.4 percent for the same prior year periods. Excluding the impact of the reserve assumption updates and non-contemporaneous reinsurance, the consolidated benefit ratio was 69.7 percent and 69.8 percent in the third quarter and first nine months of 2023, respectively, compared to 73.0 percent and 75.4 percent for the same prior year periods. The benefit ratio for each of our operating business segments is discussed more fully in "Segment Results" as follows.

Cost related to early retirement of debt for the third quarter and first nine months of 2022 includes costs associated with the redemption of $350.0 million aggregate principal amount of our 4.000% senior notes due 2024 and costs related to the retirement of $14.0 million aggregate liquidation amount of the 7.405% capital securities due 2038 issued by Provident Financing Trust I (the Trust), which resulted in the reduction of a corresponding principal amount of our 7.405% junior subordinated debt securities due 2038 then held by the Trust.

Commissions and the deferral of acquisition costs were higher during the third quarter and first nine months of 2023 compared to the same periods of 2022 driven primarily by higher overall sales and in-force block growth in our principal operating segments. The increase in the amortization of deferred acquisition costs in the third quarter and first nine months of 2023 compared to the same periods of 2022 is due primarily to increased lapses in our Colonial Life segment as well as growth in the level of the deferred asset in our Unum US supplemental and voluntary product lines and in our Colonial Life segment.

Other expenses and compensation expense, on a combined basis, increased in the third quarter and first nine months of 2023 compared to the same periods of 2022 due primarily to an increase in employee-related costs, an increase in operational investments in our business, and growth in our fee-based service products.

Our effective income tax rates for the third quarter and first nine months of 2023 were 22.8 percent and 21.3 percent of income before income tax, respectively, compared to 20.5 percent and 18.8 percent for the same prior year periods. Our effective income tax rates were generally consistent with the U.S. statutory rate of 21 percent in effect for the third quarter of 2022 and for the first nine months of 2023. Our effective income tax rates differed from the U.S. statutory rate of 21 percent for the third quarter of 2023 primarily due to interest on uncertain tax positions and for the first nine months of 2022 primarily due to the foreign tax rate differential partially offset by unfavorable global intangible low-taxed income tax.

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Consolidated Sales Results

Shown below are sales results for our three principal operating business segments.

(in millions)
	Three Months Ended September 30						Nine Months Ended September 30
	2023		% Change		2022		2023		% Change		2022
Unum US	$	170.9	8.5	%	$	157.5	$	762.1	18.1	%	$	645.4
Unum International	$	30.2	(24.7)	%	$	40.1	$	136.6	24.1	%	$	110.1
Colonial Life	$	121.3	4.7	%	$	115.9	$	350.1	3.5	%	$	338.1

Sales shown in the preceding chart generally represent the annualized premium income on new sales which we expect to receive and report as premium income during the next 12 months following or beginning in the initial quarter in which the sale is reported, depending on the effective date of the new sale. Sales do not correspond to premium income reported as revenue in accordance with GAAP. This is because new annualized sales premiums reflect current sales performance and what we expect to recognize as premium income over a 12 month period, while premium income reported in our financial statements is reported on an "as earned" basis rather than an annualized basis and also includes renewals and persistency of in-force policies written in prior years as well as current new sales.

Sales, persistency of the existing block of business, employment and salary growth, and the effectiveness of a renewal program are indicators of growth in premium income. Trends in new sales, as well as existing market share, also indicate the potential for growth in our respective markets and the level of market acceptance of price levels and new product offerings. Sales results may fluctuate significantly due to case size and timing of sales submissions.

See "Segment Results" as follows for a discussion of sales by segment.

Segment Results

Our reporting segments are comprised of the following: Unum US, Unum International, Colonial Life, Closed Block, and Corporate.

In describing our results, we may at times note certain items and exclude the impact on financial ratios and metrics to enhance the understanding and comparability of our operational performance and the underlying fundamentals, but this exclusion is not an indication that similar items may not recur. We also measure and analyze our segment performance on the basis of "adjusted operating revenue" and "adjusted operating income" or "adjusted operating loss", which differ from total revenue and income before income tax as presented in our consolidated statements of income due to the exclusion of investment gains and losses and certain other items. These performance measures are in accordance with GAAP guidance for segment reporting, but they should not be viewed as a substitute for total revenue, income before income tax, or net income. See "Reconciliation of Non-GAAP Financial Measures" contained herein in this Item 2.

Unum US Segment

The Unum US segment is comprised of the group disability, group life and accidental death and dismemberment, and supplemental and voluntary lines of business. The group disability line of business includes long-term and short-term disability, medical stop-loss, and fee-based service products. The supplemental and voluntary line of business includes voluntary benefits, individual disability, and dental and vision products.

110

Unum US Operating Results

Shown below are financial results for the Unum US segment. In the sections following, financial results and key ratios are also presented for the major lines of business within the segment.

(in millions of dollars, except ratios)
	Three Months Ended September 30								Nine Months Ended September 30
	2023			% Change		2022			2023			% Change		2022
Adjusted Operating Revenue
Premium Income	$	1,657.7		6.5	%	$	1,556.8		$	4,908.7		5.1	%	$	4,670.8
Net Investment Income	166.2			(2.6)		170.6			481.5			(5.5)		509.4
Other Income	58.0			18.4		49.0			166.1			13.1		146.8
Total	1,881.9			5.9		1,776.4			5,556.3			4.3		5,327.0
Benefits and Expenses
Policy Benefits	994.3			(5.4)		1,051.1			3,195.6			(3.8)		3,323.1
Policy Benefits - Remeasurement Gain	(144.0)			(37.1)		(229.0)			(383.0)			0.3		(382.0)
Commissions	164.3			8.6		151.3			493.7			7.7		458.6
Deferral of Acquisition Costs	(74.5)			12.5		(66.2)			(230.6)			15.6		(199.4)
Amortization of Deferred Acquisition Costs	70.0			11.3		62.9			199.2			11.6		178.5
Other Expenses	385.2			8.6		354.7			1,139.2			9.9		1,036.4
Total	1,395.3			5.3		1,324.8			4,414.1			—		4,415.2
Income Before Income Tax and Net Investment Gains and Losses	486.6			7.8		451.6			1,142.2			25.3		911.8
Reserve Assumption Updates	(128.8)			24.6		(170.8)			(128.8)			24.6		(170.8)
Adjusted Operating Income	$	357.8		27.4		$	280.8		$	1,013.4		36.8		$	741.0
Operating Ratios (% of Premium Income):
Benefit Ratio1	59.1		%			63.8		%	59.9		%			66.6		%
Other Expense Ratio2	22.5		%			22.1		%	22.5		%			21.5		%
Income Ratio	29.4		%			29.0		%	23.3		%			19.5		%
Adjusted Operating Income Ratio	21.6		%			18.0		%	20.6		%			15.9		%
1Excludes the reserve assumption updates that occurred during the third quarters of 2023 and 2022.
2Ratio of Other Expenses to Premium Income plus Unum US Group Disability Other Income, which is primarily related to fee-based services.

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Unum US Group Disability Operating Results

Shown below are financial results and key performance indicators for Unum US group disability.

(in millions of dollars, except ratios)
	Three Months Ended September 30								Nine Months Ended September 30
	2023			% Change		2022			2023			% Change		2022
Adjusted Operating Revenue
Premium Income
Group Long-term Disability	$	518.5		7.8	%	$	480.9		$	1,539.3		8.5	%	$	1,419.2
Group Short-term Disability	256.5			10.5		232.2			753.0			9.8		685.9
Total Premium Income	775.0			8.7		713.1			2,292.3			8.9		2,105.1
Net Investment Income	84.2			(0.7)		84.8			246.4			(6.2)		262.6
Other Income	51.7			6.8		48.4			158.1			10.2		143.5
Total	910.9			7.6		846.3			2,696.8			7.4		2,511.2
Benefits and Expenses
Policy Benefits	471.5			(5.4)		498.6			1,539.9			(3.6)		1,597.8
Policy Benefits - Remeasurement Gain	(146.7)			(16.0)		(174.6)			(309.5)			4.9		(295.0)
Commissions	57.2			9.8		52.1			172.6			9.2		158.0
Deferral of Acquisition Costs	(14.3)			10.9		(12.9)			(44.7)			17.3		(38.1)
Amortization of Deferred Acquisition Costs	16.2			14.1		14.2			42.1			10.8		38.0
Other Expenses	235.9			8.6		217.2			699.8			11.0		630.5
Total	619.8			4.2		594.6			2,100.2			0.4		2,091.2
Income Before Income Tax and Net Investment Gains and Losses	291.1			15.7		251.7			596.6			42.0		420.0
Reserve Assumption Updates	(121.0)			—		(121.0)			(121.0)			—		(121.0)
Adjusted Operating Income	$	170.1		30.1		$	130.7		$	475.6		59.1		$	299.0
Operating Ratios (% of Premium Income):
Benefit Ratio1	57.5		%			62.4		%	59.0		%			67.6		%
Other Expense Ratio2	28.5		%			28.5		%	28.6		%			28.0		%
Income Ratio	37.6		%			35.3		%	26.0		%			20.0		%
Adjusted Operating Income Ratio	21.9		%			18.3		%	20.7		%			14.2		%
Persistency:
Group Long-term Disability									90.8		%			90.7		%
Group Short-term Disability									89.1		%			89.2		%
1Excludes the reserve assumption updates that occurred during the third quarters of 2023 and 2022.
2Ratio of Other Expenses to Premium Income plus Other Income, which is primarily related to fee-based services.

Premium income was higher in the third quarter and first nine months of 2023 compared to the same periods of 2022 driven primarily by in-force block growth and higher sales. Net investment income was generally consistent in the third quarter of 2023 compared to the same period of 2022. Net investment income was lower in the first nine months of 2023 relative to the same period of 2022 due primarily to a decrease in the level of invested assets and a lower level of miscellaneous investment income, partially offset by an increase in the yield on invested assets. Other income increased in the third quarter and first nine months of 2023 compared to the same periods of 2022 due to growth in our fee-based service products.

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The benefit ratio, excluding the impacts of the reserve assumption updates, was favorable in the third quarter and first nine months of 2023 compared to the same periods of 2022 due primarily to favorable recoveries as well as lower claim incidence in our group long-term disability product line and favorable discount rate impacts on new claims. New claims for our group products are established using the discount rate based on an upper-medium grade fixed-income instrument, which is generally equivalent to a single-A interest rate, as of the policy issuance or policy renewal date. As a result, the increase in the discount rates for the third quarter and first nine months of 2023 compared to the same periods of 2022 contributed to the favorable benefits experience.

Commissions and the deferral of acquisition costs were higher in the third quarter and first nine months of 2023 compared to the same periods of 2022 due primarily to in-force block growth and higher sales. The amortization of deferred acquisition costs was higher in the third quarter and first nine months of 2023 compared to the same periods of 2022 primarily due to an increase in lapses in our group short-term disability product line. Our other expense ratio, which includes other income that is primarily related to fee-based service products, for the third quarter of 2023 was consistent with the same period of 2022. The other expense ratio increased in the first nine months of 2023 compared to the same period of 2022 due primarily to increases in employee-related costs and an increase in operational investments in our business, particularly related to growth in our fee-based service products.

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Unum US Group Life and Accidental Death and Dismemberment Operating Results

Shown below are financial results and key performance indicators for Unum US group life and accidental death and dismemberment.

(in millions of dollars, except ratios)
	Three Months Ended September 30								Nine Months Ended September 30
	2023			% Change		2022			2023			% Change		2022
Adjusted Operating Revenue
Premium Income
Group Life	$	423.0		1.3	%	$	417.7		$	1,254.3		0.4	%	$	1,249.9
Accidental Death & Dismemberment	44.1			0.7		43.8			131.2			1.2		129.7
Total Premium Income	467.1			1.2		461.5			1,385.5			0.4		1,379.6
Net Investment Income	23.7			(6.3)		25.3			68.2			(9.2)		75.1
Other Income	0.2			(50.0)		0.4			0.7			(41.7)		1.2
Total	491.0			0.8		487.2			1,454.4			(0.1)		1,455.9
Benefits and Expenses
Policy Benefits	345.5			(5.8)		366.6			1,050.1			(6.0)		1,116.6
Policy Benefits - Remeasurement Gain	(2.9)			(92.9)		(40.8)			(28.3)			(55.1)		(63.0)
Commissions	38.8			—		38.8			116.8			2.7		113.7
Deferral of Acquisition Costs	(9.0)			—		(9.0)			(28.9)			7.4		(26.9)
Amortization of Deferred Acquisition Costs	10.2			(7.3)		11.0			29.5			(3.3)		30.5
Other Expenses	56.4			(3.4)		58.4			171.5			1.7		168.7
Total	439.0			3.3		425.0			1,310.7			(2.2)		1,339.6
Income Before Income Tax and Net Investment Gains and Losses	52.0			(16.4)		62.2			143.7			23.6		116.3
Reserve Assumption Update	—			100.0		(34.0)			—			100.0		(34.0)
Adjusted Operating Income	$	52.0		84.4		$	28.2		$	143.7		74.6		$	82.3
Operating Ratios (% of Premium Income):
Benefit Ratio1	73.3		%			78.0		%	73.7		%			78.8		%
Other Expense Ratio	12.1		%			12.7		%	12.4		%			12.2		%
Income Ratio						13.5		%						8.4		%
Adjusted Operating Income Ratio	11.1		%			6.1		%	10.4		%			6.0		%
Persistency:
Group Life									89.3		%			89.2		%
Accidental Death & Dismemberment									88.2		%			88.1		%
1Excludes the reserve assumption update that occurred during the third quarter of 2022.
N.M. = not a meaningful percentage

Premium income increased in the third quarter and first nine months of 2023 compared to the same periods of 2022 due primarily to higher sales. Net investment income was lower in the third quarter and first nine months of 2023 relative to the same periods of 2022 due primarily to a decrease in the level of invested assets and lower miscellaneous investment income, partially offset by an increase in the yield on invested assets.

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The benefit ratio, excluding the impact of the reserve assumption update in 2022, was favorable in the third quarter and first nine months of 2023 compared to the same periods of 2022 due primarily to lower mortality, resulting primarily from lessening impacts of COVID-19 on our insured population, and a lower average claim size in the group life product line.

Commissions and the deferral of acquisition costs in the third quarter of 2023 were consistent with the same period of 2022. Commissions and the deferral of acquisition costs were higher in the first nine months of 2023 compared to the same period of 2022 due primarily to higher sales. The amortization of deferred acquisition costs in the third quarter and first nine months of 2023 was generally consistent to the same periods of 2022. The other expense ratio decreased in the third quarter of 2023 compared to the same period of 2022 due primarily to our focus on expense management and operating efficiencies. The other expense ratio increased in the first nine months of 2023 compared to the same period of 2022 due primarily to an increase in employee-related costs.

115

Unum US Supplemental and Voluntary Operating Results

Shown below are financial results and key performance indicators for Unum US supplemental and voluntary product lines.

(in millions of dollars, except ratios)
	Three Months Ended September 30								Nine Months Ended September 30
	2023			% Change		2022			2023			% Change		2022
Adjusted Operating Revenue
Premium Income
Voluntary Benefits	$	209.5		6.8	%	$	196.2		$	637.4		1.3	%	$	629.2
Individual Disability	136.7			15.0		118.9			386.7			10.4		350.3
Dental and Vision	69.4			3.4		67.1			206.8			0.1		206.6
Total Premium Income	415.6			8.7		382.2			1,230.9			3.8		1,186.1
Net Investment Income	58.3			(3.6)		60.5			166.9			(2.8)		171.7
Other Income	6.1			N.M		0.2			7.3			N.M		2.1
Total	480.0			8.4		442.9			1,405.1			3.3		1,359.9
Benefits and Expenses
Policy Benefits	177.3			(4.6)		185.9			605.6			(0.5)		608.7
Policy Benefits - Remeasurement Loss (Gain)	5.6			141.2		(13.6)			(45.2)			88.3		(24.0)
Commissions	68.3			13.1		60.4			204.3			9.3		186.9
Deferral of Acquisition Costs	(51.2)			15.6		(44.3)			(157.0)			16.8		(134.4)
Amortization of Deferred Acquisition Costs	43.6			15.6		37.7			127.6			16.0		110.0
Other Expenses	92.9			17.4		79.1			267.9			12.9		237.2
Total	336.5			10.3		305.2			1,003.2			1.9		984.4
Income Before Income Tax and Net Realized Investment Gains and Losses	143.5			4.2		137.7			401.9			7.0		375.5
Reserve Assumption Updates - Voluntary Benefits	(10.4)			(38.8)		(17.0)			(10.4)			(38.8)		(17.0)
Reserve Assumption Updates - Individual Disability	2.6			116.7		1.2			2.6			116.7		1.2
Adjusted Operating Income	$	135.7		11.3		$	121.9		$	394.1		9.6		$	359.7
Operating Ratios (% of Premium Income):
Benefit Ratios:
Voluntary Benefits1	39.1		%			43.7		%	38.1		%			43.7		%
Individual Disability1	45.4		%			44.0		%	44.3		%			49.6		%
Dental and Vision	67.4		%			74.5		%	74.6		%			73.6		%
Other Expense Ratio	22.4		%			20.7		%	21.8		%			20.0		%
Income Ratio	34.5		%			36.0		%	32.7		%			31.7		%
Adjusted Operating Income Ratio	32.7		%			31.9		%	32.0		%			30.3		%
Persistency:
Voluntary Benefits									75.5		%			75.1		%
Individual Disability									89.3		%			89.2		%
Dental and Vision									76.2		%			81.4		%
1Excludes the reserve assumption updates that occurred during the third quarters of 2023 and 2022.
N.M. = not a meaningful percentage

Premium income was higher in the third quarter and first nine months of 2023 compared to the same periods of 2022, due primarily to the partial recapture of a previously ceded block of business in the individual disability product line and higher

116

persistency in the voluntary benefits product line. Also impacting the comparison for the first nine months of 2023 compared to the same period of 2022 were higher sales across all product lines. Net investment income decreased in the third quarter and first nine months of 2023 compared to the same periods of 2022 primarily due to a decline in the yield on invested assets and lower miscellaneous investment income, partially offset by an increase in the level of invested assets. Other income increased in the third quarter and first nine months of 2023 compared to the same periods of 2022 due primarily to a net gain on the partial recapture of a previously ceded block of business in the individual disability product line.

The benefit ratio, excluding the impacts of the reserve assumption updates, for voluntary benefits was favorable in the third quarter and first nine months of 2023 compared to the same periods of 2022 due primarily to favorable experience in the disability and life product lines. The benefit ratio, excluding the impacts of the reserve assumption updates, for the individual disability product line was unfavorable in the third quarter of 2023 compared to the same period of 2022 due primarily to higher average size of submitted claims. The benefit ratio, excluding the impacts of the reserve assumption updates, for the individual disability product line was favorable for the first nine months of 2023 compared to the same period of 2022 due primarily to higher mortality. The benefit ratio for the dental and vision product line was favorable in the third quarter of 2023 compared to the same period of 2022 due primarily to lower claims incidence. The benefit ratio for the dental and vision product line was unfavorable in the first nine months of 2023 compared to the same period of 2022 due primarily to higher claims incidence.

Commissions and deferral of acquisition costs were higher in the third quarter and first nine months of 2023 compared to the same periods of 2022 due primarily to higher sales in the individual disability product line. The amortization of deferred acquisition costs was higher in the third quarter and first nine months of 2023 compared to the same periods of 2022 due to growth in the level of the deferred asset. Our other expense ratio increased in the third quarter and first nine months of 2023 compared to the same periods of 2022 due primarily to an increase in employee-related costs and an increase in operational investments in our business.

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Sales

(in millions of dollars)
	Three Months Ended September 30						Nine Months Ended September 30
	2023		% Change		2022		2023		% Change		2022
Sales by Product
Group Disability and Group Life and AD&D
Group Long-term Disability	$	36.6	3.4	%	$	35.4	$	156.1	12.1	%	$	139.2
Group Short-term Disability	30.5		66.7		18.3		117.1		42.1		82.4
Group Life and AD&D	25.2		(6.3)		26.9		152.9		11.2		137.5
Subtotal	92.3		14.5		80.6		426.1		18.7		359.1
Supplemental and Voluntary
Voluntary Benefits	39.0		(3.7)		40.5		212.5		12.6		188.8
Individual Disability	25.6		(1.2)		25.9		81.0		24.8		64.9
Dental and Vision	14.0		33.3		10.5		42.5		30.4		32.6
Subtotal	78.6		2.2		76.9		336.0		17.4		286.3
Total Sales	$	170.9	8.5		$	157.5	$	762.1	18.1		$	645.4
Sales by Market Sector
Group Disability and Group Life and AD&D
Core Market (< 2,000 employees)	$	65.8	12.1	%	$	58.7	$	255.1	11.6	%	$	228.5
Large Case Market	26.5		21.0		21.9		171.0		30.9		130.6
Subtotal	92.3		14.5		80.6		426.1		18.7		359.1
Supplemental and Voluntary	78.6		2.2		76.9		336.0		17.4		286.3
Total Sales	$	170.9	8.5		$	157.5	$	762.1	18.1		$	645.4

Group sales increased during the third quarter of 2023 compared to the same period of 2022 due to higher sales to new customers in the core market, which we define as employee groups with less than 2,000 employees, and higher sales to new and existing customers in the large case market. Group sales increased during the first nine months of 2023 compared to the same period of 2022 due to higher sales to new and existing customers in both the large case and core markets. The sales mix in the group market sector for the first nine months of 2023 was approximately 60 percent core market and 40 percent large case market.

Voluntary benefits sales decreased during the third quarter of 2023 compared to the same period of 2022 due primarily to lower sales to new and existing customers in the core market and lower sales to new customers in the large case market. Voluntary benefits sales increased during the first nine months of 2023 compared to the same period of 2022 primarily due to higher sales to new and existing customers in the large case market and higher sales to new customers in the core market. Individual disability sales, which are primarily concentrated in the multi-life market, were generally consistent in the third quarter of 2023 compared to the same period of 2022. Individual disability sales increased during the first nine months of 2023 compared to the same period of 2022 due to higher sales to both new and existing customers. Dental and vision sales increased during the third quarter and first nine months of 2023 compared to the same periods of 2022 due primarily to higher sales to both new and existing customers.

Segment Outlook

We remain committed to offering consumers a broad set of financial protection benefit products at the worksite. During 2023, we will continue to invest in a unique customer experience defined by simplicity, empathy, and deep industry expertise through the increased utilization of digital capabilities and technology to enhance enrollment, underwriting, the client administration experience, and claims processing. In addition, we will focus on strategically aligned sales by enhancing the connectivity, alignment, and support for brokers and technology partners. With respect to smaller employers, we will continue to provide a comprehensive set of consumer-focused products, enhance our distribution model, and utilize our digital tools to bring industry

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leading enrollment capabilities and a fully integrated customer experience. Our differentiated offerings and market leading leave management services provide substantial growth opportunities, particularly with larger employers, and stronger persistency in our core products. We believe our active client management, integrated customer experience across our product lines, and strong risk management, will enable us to continue to grow our market over the long-term.

We anticipate increased adjusted operating income growth in 2023 supported by premium growth and improved claim experience. We expect strong full year premium income, partially due to favorable, but normalizing, levels of in-force block growth as a result of wage inflation and an increase in the number of lives covered for our group products, as well as continued strong sales momentum. While we expect our group life claim experience to continue to improve as impacts from COVID-19 lessen, we may also continue to experience claims volatility, particularly in our group disability and group and voluntary life products. Furthermore, we could continue to experience increased expenses as we continue to invest in our people and capabilities, including our leave management services.

The current interest rate environment could continue to positively impact our yields on new investments but could also continue to create further unrealized losses in our current holdings. Our net investment income may continue to be impacted by volatility in miscellaneous investment income.

As part of our discipline in pricing and reserving, we continuously monitor emerging claim trends and interest rates. We will continue to take appropriate pricing actions on new business and renewals that are reflective of the current environment. We continuously monitor key indicators to assess our risks and adjust our business plans accordingly.

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Unum International Segment

The Unum International segment is comprised of our operations in both the United Kingdom and Poland. Our Unum UK products include insurance for group long-term disability, group life, and supplemental lines of business, which includes dental, individual disability, and critical illness products. Our Unum Poland products include insurance for individual and group life with accident and health riders. Unum International's products are sold primarily through field sales personnel and independent brokers and consultants.

Operating Results

Shown below are financial results and key performance indicators for the Unum International segment.

(in millions of dollars, except ratios)
	Three Months Ended September 30						Nine Months Ended September 30
	2023		% Change		2022		2023		% Change		2022
Adjusted Operating Revenue
Premium Income
Unum UK
Group Long-term Disability	$	101.1	12.6	%	$	89.8	$	297.5	3.5	%	$	287.5
Group Life	44.2		26.3		35.0		124.5		23.9		100.5
Supplemental	34.6		26.3		27.4		99.9		16.4		85.8
Unum Poland	30.7		45.5		21.1		85.2		27.7		66.7
Total Premium Income	210.6		21.5		173.3		607.1		12.3		540.5
Net Investment Income	27.3		(26.2)		37.0		104.0		(15.0)		122.3
Other Income	0.5		150.0		0.2		1.0		42.9		0.7
Total	238.4		13.3		210.5		712.1		7.3		663.5
Benefits and Expenses
Policy Benefits	160.9		4.7		153.7		440.1		5.0		419.2
Policy Benefits - Remeasurement Loss (Gain)	(2.4)		(90.5)		(25.3)		(6.8)		(177.3)		8.8
Commissions	18.3		22.0		15.0		53.8		19.8		44.9
Deferral of Acquisition Costs	(3.8)		31.0		(2.9)		(10.8)		16.1		(9.3)
Amortization of Deferred Acquisition Costs	2.4		84.6		1.3		6.1		—		6.1
Other Expenses	44.1		21.8		36.2		128.9		20.1		107.3
Total	219.5		23.3		178.0		611.3		5.9		577.0
Income Before Income Tax and Net Investment Gains and Losses	18.9		(41.8)		32.5		100.8		16.5		86.5
Reserve Assumption Updates	17.9		N.M		(7.6)		17.9		N.M		(7.6)
Adjusted Operating Income	$	36.8	47.8		$	24.9	$	118.7	50.4		$	78.9
N.M. = not a meaningful percentage

Foreign Currency Translation

The functional currencies of Unum UK and Unum Poland are the British pound sterling and Polish zloty, respectively. Premium income, net investment income, claims, and expenses are received or paid in the functional currency, and we hold functional currency-denominated assets to support functional currency-denominated policy liabilities. We translate functional currency-denominated financial statement items into dollars for our consolidated financial reporting. We translate income statement items using an average exchange rate for the reporting period, and we translate balance sheet items using the exchange rate at the end of the period. We report unrealized foreign currency translation gains and losses in accumulated other comprehensive income in our consolidated balance sheets.

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Fluctuations in exchange rates impact Unum International's reported financial results and our consolidated financial results. In periods when the functional currency strengthens relative to the preceding period, translation increases current period results relative to the prior period. In periods when the functional currency weakens, translation decreases current period results relative to the prior period.

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Unum UK Operating Results

Shown below are financial results and key performance indicators for the Unum UK product lines in functional currency.

(in millions of pounds, except ratios)
	Three Months Ended September 30								Nine Months Ended September 30
	2023			% Change		2022			2023			% Change		2022
Adjusted Operating Revenue
Premium Income
Group Long-term Disability	£	79.8		4.7	%	£	76.2		£	238.9		4.6	%	£	228.4
Group Life	34.9			17.1		29.8			100.0			24.5		80.3
Supplemental	27.5			17.5		23.4			80.3			17.4		68.4
Total Premium Income	142.2			9.9		129.4			419.2			11.2		377.1
Net Investment Income	19.5			(34.8)		29.9			77.7			(16.7)		93.3
Other Income	—			—		—			0.1			—		0.1
Total	161.7			1.5		159.3			497.0			5.6		470.5
Benefits and Expenses
Policy Benefits	113.5			(3.5)		117.6			312.6			4.2		300.1
Policy Benefits - Remeasurement Loss (Gain)	(1.4)			(93.4)		(21.1)			(5.3)			(189.8)		5.9
Commissions	9.3			2.2		9.1			28.3			8.8		26.0
Deferral of Acquisition Costs	(0.9)			(10.0)		(1.0)			(3.0)			(9.1)		(3.3)
Amortization of Deferred Acquisition Costs	1.3			62.5		0.8			3.8			(2.6)		3.9
Other Expenses	27.8			9.9		25.3			83.2			20.2		69.2
Total	149.6			14.5		130.7			419.6			4.4		401.8
Income Before Income Tax and Net Investment Gains and Losses	12.1			(57.7)		28.6			77.4			12.7		68.7
Reserve Assumption Updates	16.3			N.M		(5.3)			16.3			N.M		(5.3)
Adjusted Operating Income	£	28.4		21.9		£	23.3		£	93.7		47.8		£	63.4
Weighted Average Pound/Dollar Exchange Rate	1.281					1.157			1.243					1.237
Operating Ratios (% of Premium Income):
Benefit Ratio1	67.4		%			78.7		%	69.4		%			82.6		%
Other Expense Ratio	19.5		%			19.6		%	19.8		%			18.4		%
Income Ratio	8.5		%			22.1		%	18.5		%			18.2		%
Adjusted Operating Income Ratio	20.0		%			18.0		%	22.4		%			16.8		%
Persistency:
Group Long-term Disability									92.4		%			84.9		%
Group Life									83.6		%			88.2		%
Supplemental									91.0		%			92.3		%
1Excludes the reserve assumption updates that occurred during the third quarters of 2023 and 2022.
N.M. = not a meaningful percentage

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Premium income was higher in the third quarter and first nine months of 2023 compared to the same periods of 2022 due primarily to in-force block growth.

Net investment income was lower in the third quarter and first nine months of 2023 compared to the same periods of 2022 primarily due to lower investment income from inflation index-linked bonds. Our investments in inflation index-linked bonds support the claim liabilities associated with certain group policies that provide for inflation-linked increases in policy benefits. The change in net investment income attributable to these index-linked bonds is partially offset by a change in policy benefits related to the inflation index-linked group long-term disability and group life policies.

The benefit ratio, excluding the impacts of reserve assumption updates, was favorable in the third quarter and first nine months of 2023 compared to the same periods of 2022 due to favorable claim incidence, favorable claim resolutions, and higher discount rates on new claims in the group long-term disability product line, and lower inflation-linked experience in benefits, partially offset by higher incidence in the supplemental product line. Also impacting the first nine months of 2023 compared to the same period of 2022 was higher mortality in the group life product line.

Commissions, the deferral of acquisition costs, and the amortization of deferred acquisition costs were generally consistent in the third quarter and first nine months of 2023 compared to the same periods of 2022. The other expense ratio was generally consistent in the third quarter of 2023 compared to the same period of 2022. The other expense ratio was higher in the first nine months of 2023 compared to the same period of 2022 due to an increase in employee-related costs and operational investments in the business.

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Sales

(in millions of dollars and pounds)
	Three Months Ended September 30						Nine Months Ended September 30
	2023		% Change		2022		2023		% Change		2022
Unum International Sales by Product
Unum UK
Group Long-term Disability	$	8.9	39.1	%	$	6.4	$	39.0	10.8	%	$	35.2
Group Life	10.5		(62.6)		28.1		49.8		1.6		49.0
Supplemental	3.8		72.7		2.2		24.0		65.5		14.5
Unum Poland	7.0		105.9		3.4		23.8		108.8		11.4
Total Sales	$	30.2	(24.7)		$	40.1	$	136.6	24.1		$	110.1
Unum International Sales by Market Sector
Unum UK
Group Long-term Disability and Group Life
Core Market (< 500 employees)	$	11.8	26.9	%	$	9.3	$	40.3	22.9	%	$	32.8
Large Case Market	7.6		(69.8)		25.2		48.5		(5.6)		51.4
Subtotal	19.4		(43.8)		34.5		88.8		5.5		84.2
Supplemental	3.8		72.7		2.2		24.0		65.5		14.5
Unum Poland	7.0		105.9		3.4		23.8		108.8		11.4
Total Sales	$	30.2	(24.7)		$	40.1	$	136.6	24.1		$	110.1
Unum UK Sales by Product
Group Long-term Disability	£	7.0	27.3	%	£	5.5	£	31.3	13.4	%	£	27.6
Group Life	8.3		(64.7)		23.5		40.1		1.0		39.7
Supplemental	2.9		52.6		1.9		19.3		70.8		11.3
Total Sales	£	18.2	(41.1)		£	30.9	£	90.7	15.4		£	78.6
Unum UK Sales by Market Sector
Group Long-term Disability and Group Life
Core Market (< 500 employees)	£	9.4	19.0	%	£	7.9	£	32.5	25.5	%	£	25.9
Large Case Market	5.9		(72.0)		21.1		38.9		(6.0)		41.4
Subtotal	15.3		(47.2)		29.0		71.4		6.1		67.3
Supplemental	2.9		52.6		1.9		19.3		70.8		11.3
Total Sales	£	18.2	(41.1)		£	30.9	£	90.7	15.4		£	78.6

The following discussion of sales results relates only to our Unum UK product lines and is based on functional currency.

Group long-term disability sales increased in the third quarter of 2023 compared to the same period of 2022, driven by higher sales to new customers in the large case market, which we define as employee groups with greater than 500 employees, and higher sales to new customers in the core market. Group long-term disability sales were higher in the first nine months of 2023 compared to the same period of 2022 driven by higher sales to new customers in the core market and existing customers in the large case market.

Group life sales decreased in the third quarter of 2023 compared to the same period of 2022 due to lower sales to new customers in the large case market. Group life sales were generally consistent in the first nine months of 2023 compared to the same period of 2022.

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Supplemental sales increased in the third quarter and first nine months of 2023 compared to the same periods of 2022 due to higher sales in our group critical illness and dental product lines.

Segment Outlook

We are committed to driving growth in the Unum International segment and will build on the capabilities that we believe will generate growth and profitability in our businesses over the long term. In 2023, we will focus on scaling our business and broadening our international portfolio. For our Unum UK line of business, achieving growth remains a priority, and we will continue to focus on delivering a best in class health and wellbeing service to improve retention of our key customers and drive growth in small case business. We will also accelerate premium growth by focusing on both the broker experience and customer engagement, while maintaining our disciplined approach to pricing. Within our Unum Poland line of business, we will drive growth by expanding our distribution and the new direct channel. We will also continue to invest in digital capabilities, technology, and product enhancements which we believe will drive sustainable growth over the long term.

In 2023, we expect sales and premium growth to continue, alongside improving claim experience. We recognize that 2022 earnings benefited from inflation linked income that we expect to trend towards a more normalized level in 2023 and could pressure earnings growth if inflation continues to decline. We may see impacts to net investment income and fluctuations in our benefit ratio as inflation continues to moderate. We continuously monitor key indicators to assess our risks and adjust our business plans accordingly.

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Table of Contents

Colonial Life Segment

The Colonial Life segment includes insurance for accident, sickness, and disability products, which includes our dental and vision products, life products, and cancer and critical illness products issued primarily by Colonial Life & Accident Insurance Company and marketed to employees, on both a group and an individual basis, at the workplace through an independent contractor agent sales force and brokers.

Operating Results

Shown below are financial results and key performance indicators for the Colonial Life segment.

(in millions of dollars, except ratios)
	Three Months Ended September 30								Nine Months Ended September 30
	2023			% Change		2022			2023			% Change		2022
Adjusted Operating Revenue
Premium Income
Accident, Sickness, and Disability	$	236.7		0.3	%	$	236.1		$	708.0		(0.8)	%	$	714.0
Life	106.2			6.0		100.2			318.1			4.9		303.2
Cancer and Critical Illness	88.3			1.5		87.0			265.2			0.3		264.4
Total Premium Income	431.2			1.9		423.3			1,291.3			0.8		1,281.6
Net Investment Income	39.3			1.8		38.6			114.6			(0.7)		115.4
Other Income	0.3			—		0.3			0.9			12.5		0.8
Total	470.8			1.9		462.2			1,406.8			0.6		1,397.8
Benefits and Expenses
Policy Benefits	218.9			(1.0)		221.0			660.0			(4.7)		692.8
Policy Benefits - Remeasurement Gain	(87.7)			25.1		(70.1)			(93.1)			12.6		(82.7)
Commissions	88.8			3.3		86.0			266.7			3.4		258.0
Deferral of Acquisition Costs	(75.0)			6.7		(70.3)			(226.1)			7.5		(210.4)
Amortization of Deferred Acquisition Costs	56.7			46.5		38.7			153.4			19.5		128.4
Other Expenses	85.5			2.0		83.8			252.9			5.8		239.1
Total	287.2			(0.7)		289.1			1,013.8			(1.1)		1,025.2
Income Before Income Tax and Net Investment Gains and Losses	183.6			6.1		173.1			393.0			5.5		372.6
Reserve Assumption Updates	(80.7)			46.2		(55.2)			(80.7)			46.2		(55.2)
Adjusted Operating Income	$	102.9		(12.7)		$	117.9		$	312.3		(1.6)		$	317.4
Operating Ratios (% of Premium Income):
Benefit Ratio1	49.1		%			48.7		%	50.2		%			51.9		%
Other Expense Ratio	19.8		%			19.8		%	19.6		%			18.7		%
Income Ratio	42.6		%			40.9		%	30.4		%			29.1		%
Adjusted Operating Income Ratio	23.9		%			27.9		%	24.2		%			24.8		%
Persistency:
Accident, Sickness, and Disability									73.1		%			73.8		%
Life									84.7		%			85.1		%
Cancer and Critical Illness									82.2		%			82.3		%
1Excludes the reserve assumption updates that occurred during the third quarters of 2023 and 2022.

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Table of Contents

Premium income in the third quarter and first nine months of 2023 was favorable compared to the same periods of 2022 due to higher sales in prior periods, partially offset by lower persistency. Net investment income increased during the third quarter of 2023 relative to the same period of 2022 due primarily to an increase in the yield on invested assets and an increase in the level of invested assets. Net investment income was generally consistent in the first nine months of 2023 with the same period of 2022.

The benefit ratio, excluding the impacts of the reserve assumption updates, was unfavorable in the third quarter of 2023 compared to the same period of 2022 primarily due to higher incidence in the life product line. The benefit ratio, excluding the impacts of the reserve assumption updates, for the first nine months of 2023 relative to the same period of 2022 was favorable due primarily to lower claim costs in the accident, sickness, and disability product line and favorable mortality experience in the life product line resulting from lessening impacts of COVID-19.

Commissions and the deferral of acquisition costs were higher in the third quarter and first nine months of 2023 relative to the same periods of 2022 due to higher sales in prior periods. The amortization of deferred acquisition costs was higher during the third quarter and first nine months of 2023 relative to the same periods of 2022 primarily due to increased lapses and growth in the level of the deferred asset. The other expense ratio was generally consistent in the third quarter of 2023 relative to the same period of 2022. The other expense ratio was higher in the first nine months of 2023 relative to the same period of 2022 due primarily to an increase in employee-related costs and an increase in operational investments in our business.

Sales

(in millions of dollars)
	Three Months Ended September 30						Nine Months Ended September 30
	2023		% Change		2022		2023		% Change		2022
Sales by Product
Accident, Sickness, and Disability	$	73.1	2.4	%	$	71.4	$	214.5	2.1	%	$	210.0
Life	29.9		7.2		27.9		86.3		7.3		80.4
Cancer and Critical Illness	18.3		10.2		16.6		49.3		3.4		47.7
Total Sales	$	121.3	4.7		$	115.9	$	350.1	3.5		$	338.1
Sales by Market Sector
Commercial
Core Market (< 1,000 employees)	$	77.2	5.2	%	$	73.4	$	231.6	2.8	%	$	225.4
Large Case Market	10.5		(1.9)		10.7		32.3		(11.0)		36.3
Subtotal	87.7		4.3		84.1		263.9		0.8		261.7
Public Sector	33.6		5.7		31.8		86.2		12.8		76.4
Total Sales	$	121.3	4.7		$	115.9	$	350.1	3.5		$	338.1

Commercial market sales increased in the third quarter and first nine months of 2023 compared to the same periods of 2022 due primarily to higher sales to new and existing customers in the core market, which we define as accounts with less than 1,000 employees. Also impacting the commercial market sales comparison for the first nine months of 2023 is lower sales to new and existing customers in the large case market. Public sector market sales increased in the third quarter and first nine months of 2023 compared to the same periods of 2022 due to higher sales to existing customers, partially offset by lower sales to new customers.

Segment Outlook

We remain committed to providing employees and their families with simple, modern, and personal benefit solutions. During 2023, we will continue to utilize our strong distribution system of independent agents, benefit counselors and broker partnerships. We will also continue to invest in new solutions and digital capabilities to expand our reach and effectiveness, driving growth and improving productivity while enhancing the customer experience. In 2023, we will continue to bring an enhanced engagement and enrollment platform to market enabling deeper connections with employees through the enrollment process as well as maintaining stronger relationships throughout the customer lifecycle. We believe our distribution system, customer service capabilities, digital and virtual tools, and ability to serve all market sizes position us well for future growth.

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Table of Contents

In 2023, we expect positive adjusted operating income growth for the full year with sales growth and full year premium income growing from the prior year, but at a rate that is below pre-pandemic levels. We expect stable claim experience in 2023, but could continue to experience some level of claims volatility. While we believe our underlying profitability will remain strong, current economic conditions and increasing competition in the voluntary workplace market are risks to achievement of our business plans. We continuously monitor key indicators to assess our risks and adjust our business plans accordingly.

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Closed Block Segment

The Closed Block segment consists of group and individual long-term care and other insurance products no longer actively marketed. We discontinued offering individual long-term care in 2009 and group long-term care in 2012. Other insurance products include individual disability, group pension, individual life and corporate-owned life insurance, reinsurance pools and management operations, and other miscellaneous product lines.

Operating Results

Shown below are financial results and key performance indicators for the Closed Block segment.

(in millions of dollars, except ratios)
	Three Months Ended September 30								Nine Months Ended September 30
	2023			% Change		2022			2023			% Change		2022
Adjusted Operating Revenue
Premium Income
Long-term Care	$	172.1		(1.4)	%	$	174.5		$	521.2		(0.3)	%	$	523.0
All Other	54.3			(11.0)		61.0			166.0			(12.8)		190.4
Total Premium Income	226.4			(3.9)		235.5			687.2			(3.7)		713.4
Net Investment Income	274.9			9.3		251.4			796.0			(2.7)		817.7
Other Income	12.8			(2.3)		13.1			40.1			(12.1)		45.6
Total	514.1			2.8		500.0			1,523.3			(3.4)		1,576.7
Benefits and Expenses
Policy Benefits	404.4			(3.1)		417.4			1,202.8			(4.3)		1,256.8
Policy Benefits - Remeasurement Loss (Gain)	402.5			N.M		(17.3)			421.3			N.M		(20.2)
Commissions	18.3			(4.7)		19.2			55.5			(3.6)		57.6
Other Expenses	43.8			3.3		42.4			128.4			0.5		127.8
Total	869.0			88.2		461.7			1,808.0			27.1		1,422.0
Income (Loss) Before Income Tax and Net Investment Gains and Losses	(354.9)			N.M		38.3			(284.7)			N.M		154.7
Amortization of the Cost of Reinsurance	11.1			(5.9)		11.8			33.1			(14.0)		38.5
Non-Contemporaneous Reinsurance	9.2			N.M		1.7			26.4			9.5		24.1
Reserve Assumption Updates - Long-term Care	368.1			N.M		(2.9)			368.1			N.M		(2.9)
Reserve Assumption Updates - All Other	0.7			110.3		(6.8)			0.7			110.3		(6.8)
Adjusted Operating Income	$	34.2		(18.8)		$	42.1		$	143.6		(30.8)		$	207.6
Interest Adjusted Loss Ratio:
Long-term Care1	105.3		%			83.6		%	94.7		%			83.5		%
Operating Ratios (% of Premium Income):
Other Expense Ratio2	14.4		%			13.0		%	13.9		%			12.5		%
Income (Loss) Ratio	(156.8)		%			16.3		%	(41.4)		%			21.7		%
Adjusted Operating Income Ratio	15.1		%			17.9		%	20.9		%			29.1		%
Persistency:
Long-term Care									95.5		%			95.4		%
1Excludes the long-term care reserve assumption updates that occurred during the third quarters of 2023 and 2022.
2Excludes amortization of the cost of reinsurance.
N.M. = not a meaningful percentage

Premium income for long-term care in the third quarter and first nine months of 2023 was generally consistent with the same periods of 2022. Premium income for our All Other product line continues to decline as expected due to policyholder lapses.

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Net investment income was higher during the third quarter of 2023 relative to the same period of 2022 due to an increase in the level of invested assets and higher miscellaneous investment income, primarily related to increases in the NAV during the quarter on our private equity partnerships. Net investment income was lower during the first nine months of 2023 relative to the same period of 2022 due to lower miscellaneous investment income, primarily related to smaller increases in the NAV year to date on our private equity partnerships, partially offset by an increase in the level of invested assets.

Other income primarily includes the underlying results and associated net investment income of certain assumed blocks of business.

The interest adjusted loss ratio for long-term care, excluding the impacts of the long-term care reserve assumption updates, was unfavorable during the third quarter and first nine months of 2023 relative to the same periods of 2022 driven primarily by higher claim incidence as well as impacts from the change in the net premium ratio resulting from the reserve assumption update.

The other expense ratio, excluding the amortization of the cost of reinsurance related to the Closed Block individual disability reinsurance transaction, was higher in the third quarter and first nine months of 2023 compared to the same periods of 2022 due primarily to a decline in expense allowances related to the ceded block of individual disability business. Also contributing to the higher other expense ratio in the first nine months of 2023 compared to the same periods of 2022 was an increase in employee-related costs.

Individual Disability Reinsurance Transaction

As shown in the chart above, we exclude from income before income tax and net investment gains and losses, the amortization of the cost of reinsurance and the impact of non-contemporaneous reinsurance related to the Closed Block individual disability reinsurance transaction, where we ceded a significant portion of this business. As a result of the execution of the second phase of the reinsurance transaction occurring after January 1, 2021, the transition date of ASU 2018-12, in accordance with the provisions of the ASU related to non-contemporaneous reinsurance, we were required to establish the ceded reserves using an upper-medium grade fixed-income instrument as of the reinsurance transaction date in March 2021 which resulted in higher ceded reserves compared to that which was reported historically. However, the direct reserves for the block reinsured in the second phase were calculated using the original discount rate utilized as of the transition date. Both the direct and ceded reserves are then remeasured at each reporting period using a current discount rate reflective of an upper-medium grade fixed-income instrument, with the changes recognized in OCI. While the total equity impact is neutral, the different original discount rates utilized for direct and ceded reserves result in disproportionate earnings impacts. The impact of non-contemporaneous reinsurance will fluctuate depending on the magnitude of reserve changes during the period. The increase in the effects of non-contemporaneous reinsurance treatment in the third quarter and first nine months of 2023 compared to the same periods of 2022 is due to favorable experience in this block which resulted in a larger net change in reserves in the third quarter and first nine months of 2023 compared to the same periods of 2022.

Due to the increase in ceded reserves for the second phase of the reinsurance transaction as part of our adoption of ASU 2018-12, the cost of reinsurance decreased which results in a decrease in the amortization of the cost of reinsurance. The cost of reinsurance continues to be amortized over a period of approximately 25 years, on a declining trajectory generally consistent with the expected run-off pattern of the ceded reserves.

Segment Outlook

We will continue to execute on our well-defined strategy of implementing long-term care premium rate increases, efficient capital management, improved financial analysis, and operational effectiveness. We will continue to explore structural options to enhance financial flexibility. We continue to file requests with various state insurance departments for premium rate increases on certain of our individual and group long-term care policies which reflect assumptions as of the date of filings. In states for which a rate increase is submitted and approved, we routinely provide customers options for coverage changes or other approaches that might fit their current financial and insurance needs. Despite continued anticipated premium rate increases in our long-term care business, we expect overall premium income and adjusted operating revenue to decline over the long term as these closed blocks of business wind down. We will likely experience volatility in net investment income due to fluctuations of miscellaneous investment income, driven by bond calls and the increased allocation towards alternative assets, primarily private equity partnership investments, in the long-term care product line portfolio. We record changes in our share of the NAV of the partnerships in net investment income. We receive financial information related to our investments in partnerships and generally record investment income on a one-quarter lag in accordance with our accounting policy. As these net asset values are volatile and can fluctuate materially with changes in market economic conditions, there may possibly be

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significant movements up or down in future periods as conditions change. We continuously monitor key indicators to assess our risks and adjust our business plans, including utilization of derivative financial instruments to manage interest rate risk.

Profitability of our long-tailed products is affected by claims experience related to mortality and morbidity, resolutions, investment returns, premium rate increases, and persistency. The long-term care interest adjusted loss ratio may continue to experience quarterly volatility, particularly in the near term as our claim block matures and as we continue the implementation of premium rate increases. Claim resolution rates which reflect the probability that a disability or long-term care claim will close due to recovery or death of the insureds, are very sensitive to operational and external factors and can be volatile. Our claim resolution rate assumption used in determining reserves is our expectation of the resolution rate we will experience over the life of the block of business and will vary from actual experience in any one period. It is possible that variability in any of our reserve assumptions, including, but not limited to, mortality, morbidity, claim resolutions, premium rate increases, and lapses, could result in a material impact to our reserves. We continuously monitor key indicators to assess our risks and adjust our business plans accordingly.

As a result of the execution of the reinsurance transaction related to our Closed Block individual disability line of business, we have fully ceded a significant portion of this business. We expect that earnings will continue to be impacted by the amortization of the cost of reinsurance and the impacts of non-contemporaneous reinsurance, but we anticipate these impacts will decline over time with the run-off pattern of the reserves.

For further discussion of ASU 2018-12, see Note 2 of the “Notes to the Consolidated Financial Statements” contained herein in Item 8.

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Table of Contents

Corporate Segment

The Corporate segment includes investment income on corporate assets not specifically allocated to a line of business, interest expense on corporate debt, and certain other corporate income and expenses not allocated to a line of business.

Operating Results

(in millions of dollars)
	Three Months Ended September 30						Nine Months Ended September 30
	2023		% Change		2022		2023		% Change		2022
Adjusted Operating Revenue
Net Investment Income	$	18.3	30.7	%	$	14.0	$	69.8	111.5	%	$	33.0
Other Income	—		(100.0)		0.4		2.5		(30.6)		3.6
Total	18.3		27.1		14.4		72.3		97.5		36.6
Interest, Debt, and Other Expenses	59.8		(6.4)		63.9		182.2		11.5		163.4
Adjusted Operating Loss	$	(41.5)	(16.2)		$	(49.5)	$	(109.9)	(13.3)		$	(126.8)
N.M. = not a meaningful percentage

Adjusted operating loss decreased in the third quarter and first nine months of 2023 relative to the same periods of 2022 due primarily to increased net investment income, which was driven by an increase in yield on invested assets, partially offset by higher pension expenses. Also impacting the comparison for the third quarter of 2023 is a decrease in interest and debt expenses.

Segment Outlook

We expect to continue to generate excess capital on an annual basis through the statutory earnings in our insurance subsidiaries and believe we are well positioned with flexibility to preserve our capital strength while also returning capital to our shareholders. We may experience volatility in net investment income due to changes in the prevailing interest rates as well as both the composition and level of invested assets.

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Investments

Overview

Investment activities are an integral part of our business, and profitability is significantly affected by investment results. We segment our invested assets into portfolios that support our various product lines. Generally, our investment strategy for our portfolios is to match the effective asset cash flows and durations with related expected liability cash flows and durations to consistently meet the liability funding requirements of our businesses. We seek to earn investment income while assuming credit risk in a prudent and selective manner, subject to constraints of quality, liquidity, diversification, and regulatory considerations. Our overall investment philosophy is to invest in a portfolio of high quality assets that provide investment returns consistent with that assumed in the pricing of our insurance products. Assets are invested predominately in fixed maturity securities.

We manage our asset and liability cash flow match and our asset and liability duration match to manage interest rate risk. We may redistribute investments among our different lines of business or sell selected securities and reinvest the proceeds, when necessary, to adjust the cash flow and/or duration of the asset portfolios to better match the cash flow and duration of the liability portfolios. Asset and liability portfolio modeling is updated on a quarterly basis and is used as part of the overall interest rate risk management strategy. Cash flows from the in-force asset and liability portfolios are projected at current interest rate levels and at levels reflecting an increase and a decrease in interest rates to obtain a range of projected cash flows under the different interest rate scenarios. These results enable us to assess the impact of projected changes in cash flows and duration resulting from potential changes in interest rates. Testing the asset and liability portfolios under various interest rate scenarios enables us to choose what we believe to be the most appropriate investment strategy, as well as to limit the risk of disadvantageous outcomes. Although we test the asset and liability portfolios under various interest rate scenarios as part of our modeling, the majority of our liabilities related to insurance contracts are not interest rate sensitive, and we therefore have minimal exposure to policy withdrawal risk. Our determination of investment strategy relies on long-term measures such as reserve adequacy analysis and the relationship between the portfolio yields supporting our various product lines and the aggregate discount rate assumptions embedded in the reserves. We also use this analysis in determining hedging strategies and utilizing derivative financial instruments to manage interest rate risk and the risk related to matching duration for our assets and liabilities. We do not use derivative financial instruments for speculative purposes.

Our investment portfolio is well diversified by type of investment and industry sector. We have established an investment strategy that we believe will provide for adequate cash flows from operations and allow us to hold our securities through periods where significant decreases in fair value occur. We believe our emphasis on risk management in our investment portfolio has positioned us well and generally reduced the volatility in our results.

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Fixed Maturity Securities

The fair values and associated unrealized gains and losses of our fixed maturity securities portfolio, by industry classification, are as follows:

Fixed Maturity Securities - By Industry Classification

As of September 30, 2023

(in millions of dollars)
Classification	Fair Value		Net Unrealized Gain (Loss)		Fair Value with Gross Unrealized Loss		Gross Unrealized Loss		Fair Value with Gross Unrealized Gain		Gross Unrealized Gain
Basic Industry	$	2,391.4	$	(274.7)	$	1,967.5	$	294.2	$	423.9	$	19.5
Capital Goods	3,034.3		(299.0)		2,234.5		343.7		799.8		44.7
Communications	2,154.9		(219.2)		1,405.9		277.3		749.0		58.1
Consumer Cyclical	1,299.9		(162.7)		1,087.9		176.6		212.0		13.9
Consumer Non-Cyclical	5,846.7		(768.6)		4,467.2		838.9		1,379.5		70.3
Energy	2,512.4		(128.1)		1,449.6		182.4		1,062.8		54.3
Financial Institutions	3,540.6		(558.9)		3,301.4		565.9		239.2		7.0
Mortgage/Asset-Backed	604.9		(50.1)		490.8		54.2		114.1		4.1
Sovereigns	819.6		(126.1)		376.6		138.9		443.0		12.8
Technology	1,372.6		(202.9)		1,282.3		207.6		90.3		4.7
Transportation	1,566.1		(208.0)		1,312.5		217.9		253.6		9.9
U.S. Government Agencies and Municipalities	3,966.1		(706.0)		2,953.7		763.7		1,012.4		57.7
Public Utilities	4,961.2		(449.3)		3,525.9		517.0		1,435.3		67.7
Total	$	34,070.7	$	(4,153.6)	$	25,855.8	$	4,578.3	$	8,214.9	$	424.7

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The following two tables show the length of time our investment-grade and below-investment-grade fixed maturity securities portfolios had been in a gross unrealized loss position as of September 30, 2023 and at the end of the prior four quarters. The relationships of the current fair value to amortized cost are not necessarily indicative of the fair value to amortized cost relationships for the securities throughout the entire time that the securities have been in an unrealized loss position nor are they necessarily indicative of the relationships after September 30, 2023. The increase in the unrealized loss on fixed maturity securities during the third quarter of 2023 was due primarily to an increase in U.S. Treasury rates.

Unrealized Loss on Investment-Grade Fixed Maturity Securities

Length of Time in Unrealized Loss Position

(in millions of dollars)
	2023						2022
	September 30		June 30		March 31		December 31		September 30
Fair Value < 100% >= 70% of Amortized Cost
<= 90 days	$	242.2	$	89.7	$	38.2	$	63.0	$	523.7
> 90 <= 180 days	152.4		45.9		14.2		316.6		879.0
> 180 <= 270 days	79.2		21.0		169.2		614.5		945.4
> 270 days <= 1 year	5.5		234.9		461.9		1,126.6		218.6
> 1 year <= 2 years	2,307.7		2,203.2		1,678.1		484.0		195.0
> 2 years <= 3 years	195.4		58.3		64.8		19.2		2.9
> 3 years	6.8		2.1		1.9		—		—
Sub-total	2,989.2		2,655.1		2,428.3		2,623.9		2,764.6
Fair Value < 70% >= 40% of Amortized Cost
<= 90 days	—		28.2		—		10.6		—
> 90 <= 180 days	—		—		5.5		—		22.3
> 180 <= 270 days	—		10.0		—		28.5		564.2
> 270 days <= 1 year	34.9		—		24.1		320.2		427.4
> 1 year <= 2 years	1,180.0		547.0		367.1		532.7		176.5
> 2 years <= 3 years	157.5		58.1		51.7		29.6		18.5
> 3 years	15.7		—		—		—		—
Sub-total	1,388.1		643.3		448.4		921.6		1,208.9
Fair Value <= 40% of Amortized Cost
> 1 year <= 2 years	26.7		16.5		—		—		—
Sub-total	26.7		16.5		—		—		—
Total	$	4,404.0	$	3,314.9	$	2,876.7	$	3,545.5	$	3,973.5

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Unrealized Loss on Below-Investment-Grade Fixed Maturity Securities

Length of Time in Unrealized Loss Position

(in millions of dollars)
	2023						2022
	September 30		June 30		March 31		December 31		September 30
Fair Value < 100% >= 70% of Amortized Cost
<= 90 days	$	3.7	$	2.7	$	1.5	$	1.8	$	27.1
> 90 <= 180 days	2.4		1.2		—		12.6		58.5
> 180 <= 270 days	1.4		—		6.3		39.1		103.8
> 270 days <= 1 year	—		5.8		31.8		84.7		15.2
> 1 year <= 2 years	106.7		112.2		82.9		17.5		3.8
> 2 years <= 3 years	3.9		—		—		0.5		0.7
> 3 years	2.7		2.9		2.5		2.7		3.4
Sub-total	120.8		124.8		125.0		158.9		212.5
Fair Value < 70% >= 40% of Amortized Cost
> 180 <= 270 days	—		—		—		—		5.0
> 270 days <= 1 year	—		—		—		7.6		—
> 1 year <= 2 years	27.7		1.3		—		1.3		—
> 2 years <= 3 years	—		—		—		5.1		6.2
> 3 years	15.1		13.8		13.7		9.6		9.9
Sub-total	42.8		15.1		13.7		23.6		21.1
Fair Value <= 40% of Amortized Cost
> 270 days <= 1 year	—		0.1		—		—		—
> 1 year <= 2 years	10.5		9.5		11.2		—		—
> 3 years	0.2		0.2		—		—		—
Sub-total	10.7		9.8		11.2		—		—
Total	$	174.3	$	149.7	$	149.9	$	182.5	$	233.6

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As of September 30, 2023, we held 104 investment-grade fixed maturity securities with a gross unrealized loss of $10.0 million or greater as shown in the chart below.

Gross Unrealized Losses $10 Million or Greater on Investment-Grade Fixed Maturity Securities
As of September 30, 2023
(in millions of dollars)
Classification	Fair Value		Gross Unrealized Loss		Numbers of Issuers
Basic Industry	$	348.3	$	(90.9)	6
Capital Goods	513.5		(114.6)		9
Communications	525.7		(138.6)		8
Consumer Cyclical	356.1		(92.9)		6
Consumer Non-Cyclical	1,538.4		(331.2)		25
Energy	266.4		(54.1)		4
Financial Institutions	1,236.7		(213.6)		14
Sovereigns	348.1		(129.0)		2
Technology	348.9		(91.1)		6
Transportation	357.6		(95.4)		7
U.S. Government Agencies and Municipalities	391.6		(93.2)		8
Public Utilities	639.0		(160.9)		9
Total	$	6,870.3	$	(1,605.5)	104

At September 30, 2023, we held three below investment-grade fixed maturity securities with a gross unrealized loss greater than $10.0 million. The first security is a utility company and had a fair value of $25.5 million and a gross unrealized loss of $19.9 million. The second security is a pharmaceutical company and had a fair value of $38.0 million and a gross unrealized loss of $12.2 million. The third security is a communications company and had a fair value of $4.5 million and a gross unrealized loss of $10.4 million.

Unrealized losses on investment-grade fixed maturity securities principally relate to changes in interest rates or changes in market or sector credit spreads which occurred subsequent to the acquisition of the securities. Below-investment-grade fixed maturity securities are generally more likely to develop credit concerns than investment-grade securities. At September 30, 2023, the unrealized losses in our below-investment-grade fixed maturity securities were generally due to higher interest rates, wider credit spreads in certain industries or sectors and, to a lesser extent, credit concerns related to specific securities. For each specific security in an unrealized loss position, we believe that there are positive factors which mitigate credit concerns and that the securities for which we have not recorded a credit loss will recover in value. We have the ability and intent to continue to hold these securities to recovery of amortized cost and believe that no credit losses have occurred.

We had no individual net investment losses of $10.0 million or greater from credit losses or sales of fixed maturity securities during the first nine months of 2023. During the third quarter of 2022, we recognized a realized loss of $12.6 million on the sale of securities of a pharmaceutical company that was impacted by an adverse ruling surrounding a patent held for its largest drug. We had no other individual investment losses of $10.0 million or greater from credit losses or sales of fixed maturity securities during the first nine months of 2022.

During the third quarter of 2023, we took the opportunity to sell over $700 million of shorter duration bonds in our long-term care portfolio and reinvest the proceeds in higher quality, higher yielding, and longer duration bonds that better match our liability cash flows. Although this activity did not result in any individual losses of $10.0 million or greater, it did result in a total of $35 million in net investment losses but will be accretive to net investment income in future quarters.

As of September 30, 2023, the amortized cost net of allowance for credit losses and fair value of our below-investment-grade fixed maturity securities was $1,581.5 million and $1,411.3 million, respectively, and our below-investment-grade fixed maturity securities as a percentage of our total investment portfolio decreased from 4.6 percent at December 31, 2022 to 3.3 percent at September 30, 2023 on a fair value basis. Below-investment-grade securities are inherently riskier than investment-

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grade securities since the risk of default by the issuer, by definition and as exhibited by bond rating, is higher. Also, the secondary market for certain below-investment-grade issues can be highly illiquid. Additional downgrades may occur, but we do not anticipate any liquidity problems resulting from our investments in below-investment-grade securities, nor do we expect these investments to adversely affect our ability to hold our other investments to maturity.

Fixed Maturity Securities - Foreign Exposure

Our investments in issuers in foreign countries are chosen for specific portfolio management purposes, including asset and liability management and portfolio diversification across geographic lines and sectors to minimize non-market risks. In our approach to investing in fixed maturity securities, specific investments within foreign countries and industry sectors are evaluated for their market position and specific strengths and potential weaknesses.  For each security, we consider the political, legal, and financial environment of the sovereign entity in which an issuer is domiciled and operates. The country of domicile is based on consideration of the issuer's headquarters, in addition to location of the assets and the country in which the majority of sales and earnings are derived.  We do not have exposure to foreign currency risk, as the cash flows from these investments are either denominated in currencies or hedged into currencies to match the related liabilities. We continually evaluate our foreign investment risk exposure.

Mortgage Loans

The carrying value of our mortgage loan portfolio was $2,321.5 million and $2,435.4 million at September 30, 2023 and December 31, 2022, respectively. Our investments in mortgage loans are carried at amortized cost less an allowance for expected credit losses which was $10.2 million and $9.3 million at September 30, 2023 and December 31, 2022, respectively. Our mortgage loan portfolio is comprised entirely of commercial mortgage loans. Our mortgage loan portfolio is well diversified geographically and among property types.

Due to conservative underwriting, the incidence of non-performing mortgage loans and foreclosure activity continues to be low. Other than our allowance for expected credit losses, we held no specifically identified impaired mortgage loans at September 30, 2023 or December 31, 2022. See Note 4 in the "Notes to Consolidated Financial Statements" contained herein in Item 1 for further discussion of our mortgage loan portfolio and the allowance for expected credit losses.

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Private Equity Partnerships

The carrying value of our investments in private equity partnerships was $1,280.9 million and $1,194.3 million at September 30, 2023 and December 31, 2022, respectively. These partnerships are passive in nature and represent funds that are primarily invested in private credit, private equity, and real assets. The carrying value of the partnerships is based on our share of the partnership's NAV and changes in the carrying value are recorded as a component of net investment income. We receive financial information related to our investments in partnerships and generally record investment income on a one-quarter lag in accordance with our accounting policy. We recorded net investment income totaling $22.6 million and $56.7 million for the partnerships in the third quarter and first nine months of 2023, respectively. The majority of our investments in partnerships are not redeemable. Distributions received from the funds arise from income generated by the underlying investments as well as the liquidation of the underlying investments. There is generally not a public market for these investments. We had $836.9 million of commitments for additional investments in the partnerships at September 30, 2023 which may or may not be funded. See Note 3 in the "Notes to Consolidated Financial Statements" contained herein in Item 1 for further discussion of our private equity partnerships.

Derivative Financial Instruments

We use derivative financial instruments primarily to manage interest rate risk, risk related to matching duration for our assets and liabilities, foreign currency risk, credit risk, and equity risk. Historically, we have utilized current and forward interest rate swaps, current and forward currency swaps, forward benchmark interest rate locks, currency forward contracts, forward contracts on specific fixed income securities, credit default swaps, and total return swaps. During the first nine months of 2023, we entered into $1,088.0 million of notional forward U.S. Treasury interest rate locks in our long-term care product line to manage our reinvestment risk. Credit exposure on derivatives is limited to the value of those contracts in a net gain position, including accrued interest receivable less collateral held. Our credit exposure on derivatives was a nominal amount at September 30, 2023. At September 30, 2023, the carrying value of fixed maturity securities received from our counterparties was $17.8 million. The carrying value of fixed maturity securities and cash posted as collateral to our counterparties was $166.0 million and $4.6 million, respectively, at September 30, 2023. We believe that our credit risk is mitigated by our use of multiple counterparties, all of which have an investment-grade credit rating, and by our use of cross-collateralization agreements. See Note 5 in the "Notes to Consolidated Financial Statements" contained herein in Item 1 for further discussion of our derivatives.

For further information see "Investments" in Part I, Item 1 and "Critical Accounting Estimates" and "Investments" in Part II, Item 7 of our annual report on Form 10-K for the year ended December 31, 2022, and Notes 3, 4, and 5 of the "Notes to Consolidated Financial Statements" contained herein in Item 1.

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Liquidity and Capital Resources

Overview

Our liquidity requirements are met primarily by cash flows provided from operations, principally in our insurance subsidiaries. Premium and investment income, as well as maturities and sales of invested assets, provide the primary sources of cash. Debt and/or securities offerings provide additional sources of liquidity. Cash is applied to the payment of policy benefits, costs of acquiring new business (principally commissions), operating expenses, and taxes, as well as purchases of new investments.

We have established an investment strategy that we believe will provide for adequate cash flows from operations. We attempt to match our asset cash flows and durations with expected liability cash flows and durations to meet the funding requirements of our business. However, deterioration in the credit market may delay our ability to sell our positions in certain of our fixed maturity securities in a timely manner and adversely impact the price we receive for such securities, which may negatively impact our cash flows. Furthermore, if we experience defaults on securities held in the investment portfolios of our insurance subsidiaries, this will negatively impact statutory capital, which could reduce our insurance subsidiaries' capacity to pay dividends to our holding companies. A reduction in dividends to our holding companies could force us to seek external financing to avoid impairing our ability to pay dividends to our stockholders or meet our debt and other payment obligations.

Our policy benefits are primarily in the form of claim payments, and we have minimal exposure to the policy withdrawal risk associated with deposit products such as individual life policies or annuities. A decrease in demand for our insurance products or an increase in the incidence of new claims or the duration of existing claims could negatively impact our cash flows from operations. However, our historical pattern of benefits paid to revenues is generally consistent, even during cycles of economic downturns, which serves to minimize liquidity risk.

The liquidity requirements of the holding company, Unum Group, include common stock dividends, interest and debt service, and ongoing investments in our businesses.  Unum Group's liquidity requirements are met by assets held by Unum Group and our intermediate holding companies, dividends from primarily our insurance subsidiaries, and issuance of common stock, debt, or other capital securities and borrowings from our existing credit facility, as needed. As of September 30, 2023, Unum Group and our intermediate holding companies had available holding company liquidity of $1,182.0 million that was held primarily in bank deposits, commercial paper, money market funds, corporate bonds, municipal bonds and asset backed securities.  No significant restrictions exist on our ability to use or access funds in any of our U.S. or foreign intermediate holding companies. Dividends repatriated from our foreign subsidiaries are eligible for 100 percent exemption from U.S. income tax but may be subject to withholding tax and/or tax on foreign currency gain or loss.

As part of our capital deployment strategy, we may repurchase shares of Unum Group's common stock, as authorized by our board of directors. In December 2022, our board of directors authorized the repurchase of up to $200.0 million of Unum Group's outstanding common stock beginning January 1, 2023. In February 2023, our board of directors authorized an increase to the share repurchase program such that we are now authorized to repurchase up to $250.0 million of Unum Group's outstanding common stock. This share repurchase program has an expiration date of December 31, 2023, with the timing and amount of repurchase activity to be based on market conditions and other considerations, including the level of available cash, alternative uses for cash, and our stock price. In October 2023, our board of directors authorized the repurchase of up to $500.0 million of Unum Group's outstanding common stock beginning on January 1, 2024. The repurchase program authorized in October 2023 has no scheduled termination date. During the nine months ended September 30, 2023, we repurchased 3.9 million shares at a cost of $175.4 million. As of September 30, 2023, the remaining repurchase amount under the current share repurchase program was $75.9 million. See Note 12 of the "Notes to Consolidated Financial Statements" contained herein in Item 1.

Cash Available from Subsidiaries

Unum Group and certain of its intermediate holding company subsidiaries depend on payments from subsidiaries to pay dividends to stockholders, to pay debt obligations, and/or to pay expenses. These payments by our insurance and non-insurance subsidiaries may take the form of dividends, operating and investment management fees, and/or interest payments on loans from the parent to a subsidiary.

Restrictions under applicable state insurance laws limit the amount of dividends that can be paid to a parent company from its insurance subsidiaries in any 12-month period without prior approval by regulatory authorities. For life insurance companies domiciled in the U.S., that limitation generally equals, depending on the state of domicile, either ten percent of an insurer's statutory surplus with respect to policyholders as of the preceding year end or the statutory net gain from operations, excluding

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realized capital gains and losses, of the preceding year. The payment of dividends to a parent company from a life insurance subsidiary is generally further limited to the amount of unassigned funds.

In connection with a financial examination of Unum America, which closed at the end of the second quarter of 2020, the Maine Bureau of Insurance (MBOI) concluded that Unum America’s long-term care statutory reserves were deficient by $2,100 million as of December 31, 2018, the financial statement date of the examination period. The amount reserves are deficient by may increase or decrease over time based on changes in assumed reinvestment rates, policyholder inventories, premium rate increase activity, and the underlying growth in the locked in statutory reserve basis as well as updates to other long term actuarial assumptions. This amount is reviewed and updated annually in the fourth quarter. The MBOI granted permission to Unum America on May 1, 2020, to phase in the additional statutory reserves over seven years beginning with year-end 2020 and ending with year-end 2026. Additional information regarding the Unum America premium deficiency reserve is as follows:

	(in millions of dollars)
Premium Deficiency Reserve
Gross Premium Deficiency Reserve as of December 31, 2022	$	2,851.0
Cumulative Gross Premium Deficiency Reserve Recognized through December 31, 2022	1,191.0
Remaining Premium Deficiency Reserve to be Recognized as of December 31, 2022	1,660.0
Gross Premium Deficiency Reserve Recognized during the three months ended March 31, 2023	53.5
Gross Premium Deficiency Reserve Recognized during the three months ended June 30, 2023	130.0
Gross Premium Deficiency Reserve Recognized during the three months ended September 30, 2023	175.0
Remaining Premium Deficiency Reserve to be Recognized as of September 30, 2023	$	1,301.5

The phase in amount during the nine months ended September 30, 2023 was funded using cash flows from operations and capital contributions from Unum Group. This strengthening is incorporated by using explicitly agreed upon margins into our existing assumptions for annual statutory reserve adequacy testing. These actions add margin to Unum America's best estimate assumptions. Our long-term care reserves and financial results reported under generally accepted accounting principles are not affected by the MBOI's examination conclusion. We expect no additional funding required to fully recognize the premium deficiency reserve by year end.

Unum America cedes blocks of business to Fairwind Insurance Company (Fairwind), which is an affiliated captive reinsurance subsidiary domiciled in the United States. The ability of Fairwind to pay dividends to Unum Group will depend on its satisfaction of applicable regulatory requirements and on the performance of the business reinsured by Fairwind. Fairwind did not pay dividends in 2022 nor do we anticipate that Fairwind will pay dividends in 2023. During the first nine months of 2023, Unum Group made $600.0 million in capital contributions to Fairwind.

The ability of Unum Group and certain of its intermediate holding company subsidiaries to continue to receive dividends from their insurance subsidiaries also depends on additional factors such as RBC ratios and capital adequacy and/or solvency requirements, funding growth objectives at an affiliate level, and maintaining appropriate capital adequacy ratios to support desired ratings. The RBC ratios for our U.S. insurance subsidiaries at September 30, 2023 are in line with our expectations and are significantly above the level that would require state regulatory action.

Unum Group and/or certain of its intermediate holding company subsidiaries may also receive dividends from our U.K. subsidiaries, the payment of which may be subject to applicable insurance company regulations and capital guidance in the U.K. Unum Limited is subject to the requirements of Solvency II, a European Union (EU) directive that is part of retained UK law pursuant to the European Union (Withdrawal) Act 2018, which prescribes capital requirements and risk management standards for the European insurance industry. Our U.K. holding company is also subject to the Solvency II requirements relevant to insurance holding companies while, together with certain of its subsidiaries including Unum Limited, the group (the Unum UK Solvency II Group) is subject to group supervision under Solvency II. The Unum UK Solvency II Group received approval from the U.K. Prudential Regulation Authority to use its own internal model for calculating regulatory capital and also received approval for certain associated regulatory permissions including transitional relief as the Solvency II capital regime continues to be implemented. In connection with the U.K.’s exit from the EU, the U.K. government is reviewing the regulatory framework of financial services companies which may result in changes to U.K. regulatory capital or U.K. tax regulations. Recent economic conditions have caused volatility in our solvency ratios used to monitor capital adequacy.

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The payment of dividends to the parent company from our subsidiaries also requires the approval of the individual subsidiary's board of directors.

During 2023, we intend to maintain a level of capital in our insurance subsidiaries above the applicable capital adequacy requirements and minimum solvency margins.

Insurance regulatory restrictions do not limit the amount of dividends available for distribution from non-insurance subsidiaries except where the non-insurance subsidiaries are held directly or indirectly by an insurance subsidiary and only indirectly by Unum Group, which does not apply to our current entity structure.

Funding for Employee Benefit Plans

During the nine months ended September 30, 2023, we made contributions of $57.0 million and £3.4 million to our U.S. and U.K. defined contribution plans, respectively, and expect to make additional contributions of approximately $20 million and £1 million during the remainder of 2023. We had no regulatory contribution requirements for our U.S. and U.K. qualified defined benefit pension plans and made no voluntary contributions during the nine months ended September 30, 2023. We do not expect to have regulatory contribution requirements for our U.S. and U.K. qualified defined benefit pension plans during the remainder of 2023, but we reserve the right to make voluntary contributions during the remainder of 2023. We have met all minimum pension funding requirements set forth by the Employee Retirement Income Security Act. We have estimated our future funding requirements under the Pension Protection Act of 2006 and under applicable U.K. law and do not believe that any future funding requirements will cause a material adverse effect on our liquidity.

Debt, Term Loan Facility, Credit Facilities, and Other Sources of Liquidity

Our short-term debt balance at September 30, 2023 was $2.0 million and is comprised entirely of our 7.000% unsecured medium-term notes due in the fourth quarter of 2023.

Our long-term debt balance at September 30, 2023 was $3,429.8 million, net of deferred debt issuance costs of $31.2 million, and is comprised of our unsecured notes, which consist of our senior notes, medium-term notes, term loan facility, and junior subordinated debt securities.

We have a five-year $500 million senior unsecured revolving credit facility with a syndicate of lenders which is currently scheduled to expire in April 2027. Certain of our traditional U.S. life insurance subsidiaries may also borrow under the credit facility subject to an unconditional guarantee by Unum Group. At September 30, 2023, there were no borrowed amounts outstanding under the credit facility and letters of credit totaling $0.4 million had been issued.

We also have a five-year £75 million senior unsecured standby letter of credit facility with a different syndicate of lenders, pursuant to which a syndicated letter of credit was issued in favor of Unum Limited (as beneficiary), our U.K. insurance subsidiary, and is available for drawings up to £75 million until its scheduled expiration in July 2026. No amounts have been drawn on the letter of credit.

Borrowings under the term loan facility and the credit facilities are subject to financial covenants, negative covenants, and events of default that are customary. The term loan facility and each credit facility include financial covenants based on our leverage ratio and consolidated net worth. The term loan facility and the credit facilities are also subject to covenants that limit subsidiary indebtedness.

We also have a 20-year facility agreement with a Delaware trust that gives us the right to issue and to sell to the trust, on one or more occasions, up to $400.0 million of 4.046% senior notes in exchange for U.S. Treasury securities held by the trust. These senior notes will not be issued unless and until the issuance right is exercised. The exercise of the issuance right triggers recognition of the senior notes on our consolidated balance sheets. As the amount we receive upon exercise of the issuance right is contingent upon the value of the U.S. Treasury securities, a decline in the value of the U.S. Treasury securities reduces the amount we would receive upon exercise of the issuance right. We may also direct the trust to grant the right to exercise the issuance right with respect to all or a designated amount of the senior notes to one or more assignees (who are our consolidated subsidiaries or persons to whom we have an obligation).

There are no significant financial covenants associated with any of our outstanding notes or debt securities. We continually monitor our compliance with our term loan facility and credit facility covenants and remain in compliance. We have not observed any current trends that would cause a breach of any of our term loan facility and credit facility covenants.

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See "Debt, Term Loan Facility, Credit Facilities and Other Sources of Liquidity" and Note 8 of the "Notes to Consolidated Financial Statements" contained in Part II, Items 7 and 8, respectively, of our annual report on Form 10-K for the year ended December 31, 2022 for further discussion.

Shelf Registration

We maintain a shelf registration with the Securities and Exchange Commission to issue various types of securities, including common stock, preferred stock, debt securities, depository shares, stock purchase contracts, units and warrants. The shelf registration enables us to raise funds from the offering of any securities covered by the shelf registration as well as any combination thereof, subject to market conditions and our capital needs.

Commitments

At September 30, 2023, we had commitments of $53.8 million to fund certain investments in private placement fixed maturity securities and $836.9 million to fund certain private equity partnerships. In addition, we had $8.8 million of commercial mortgage loan commitments.

With respect to our commitments and off-balance sheet arrangements, see the discussion under "Commitments" in Part II, Item 7 of our annual report on Form 10-K for the year ended December 31, 2022. During the first nine months of 2023, there were no substantive changes in our commitments, contractual obligations, or other off-balance sheet arrangements other than the changes noted herein.

Transfers of Financial Assets

Our investment policy permits us to lend fixed maturity securities to unaffiliated financial institutions in short-term securities lending agreements, which increases our investment income with minimal risk. We account for all of our securities lending agreements and repurchase agreements as secured borrowings. As of September 30, 2023, we held $59.6 million of cash collateral from securities lending agreements. The average cash collateral balance during the first nine months of 2023 was $89.1 million, and the maximum amount outstanding at any month end was $134.4 million. As of September 30, 2023, we held $12.3 million of off-balance sheet securities lending agreements which were collateralized by securities that we were neither permitted to sell nor control. The average balance of these off-balance sheet transactions during the first nine months of 2023 was $33.9 million, and the maximum amount outstanding at any month end was $65.5 million.

To manage our cash position more efficiently, we may enter into securities repurchase agreements with unaffiliated financial institutions. We generally use securities repurchase agreements as a means to finance the purchase of invested assets or for short-term general business purposes until projected cash flows become available from our operations or existing investments. We had no securities repurchase agreements outstanding at September 30, 2023, nor did we utilize any securities repurchase agreements during the first nine months of 2023. Our use of securities repurchase agreements and securities lending agreements can fluctuate during any given period and will depend on our liquidity position, the availability of long-term investments that meet our purchasing criteria, and our general business needs.

Certain of our U.S. insurance subsidiaries are members of regional FHLBs. As of September 30, 2023, we owned $16.3 million of FHLB common stock and had outstanding advances of $76.9 million from the regional FHLBs which were used for the purpose of investing in either short-term investments or fixed maturity securities. As of September 30, 2023, we have additional borrowing capacity of approximately $753.0 million from the FHLBs.

See Note 4 of the "Notes to Consolidated Financial Statements" contained herein in Item 1 for further information.

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Consolidated Cash Flows

(in millions of dollars)
	Nine Months Ended September 30
	2023		2022
Net Cash Provided by Operating Activities	$	859.3	$	1,061.8
Net Cash Used by Investing Activities	(498.6)		(691.2)
Net Cash Used by Financing Activities	(314.0)		(302.3)
Net Increase in Cash and Bank Deposits	$	46.7	$	68.3

Operating Cash Flows

Operating cash flows are primarily attributable to the receipt of premium and investment income, offset by payments of claims, commissions, expenses, and income taxes. Premium income growth is dependent not only on new sales, but on policy renewals and growth of existing business, renewal price increases, and persistency. Investment income growth is dependent on the growth in the underlying assets supporting our insurance reserves and capital and on the earned yield. The level of commissions and operating expenses is attributable to the level of sales and the first year acquisition expenses associated with new business as well as the maintenance of existing business. The level of paid claims is affected partially by the growth and aging of the block of business and also by the general economy, as previously discussed in the operating results by segment.

Investing Cash Flows

Investing cash inflows consist primarily of the proceeds from the sales and maturities of investments. Investing cash outflows consist primarily of payments for purchases of investments. Our investment strategy is to match the cash flows and durations of our assets with the cash flows and durations of our liabilities to meet the funding requirements of our business. When market opportunities arise, we may sell selected securities and reinvest the proceeds to improve the yield and credit quality of our portfolio. We may at times also sell selected securities and reinvest the proceeds to improve the duration matching of our assets and liabilities and/or re-balance our portfolio. As a result, sales before maturity may vary from period to period. The sale and purchase of short-term investments is influenced by proceeds received from FHLB funding advances, issuance of debt, our securities lending program, and by the amount of cash which is at times held in short-term investments to facilitate the availability of cash to fund the purchase of appropriate long-term investments, repay maturing debt, and/or to fund our capital deployment program.

During the third quarter of 2023, we sold over $700.0 million of shorter duration bonds in our long-term care portfolio and reinvested the proceeds in higher quality, higher yielding, and longer duration bonds that better match our liability cash flows. As a result of this activity, both sales and purchases of fixed maturity securities increased in the first nine months of 2023 compared to the same prior year period.

See Note 4 of the "Notes to Consolidated Financial Statements" contained herein in Item 1 for further information.

Financing Cash Flows

Financing cash flows consist primarily of borrowings and repayments of debt, dividends paid to stockholders, repurchases of common stock, and policyholders' account deposits and withdrawals.

Cash used to repurchase shares of Unum Group's common stock during the first nine months of 2023 and 2022 was $174.2 million and $136.1 million, respectively. During the first nine months of 2023 and 2022, we paid dividends of $205.7 million and $188.4 million, respectively, to holders of Unum Group's common stock.

Also included in financing cash flows during the first nine months of 2023 and 2022 was $18.6 million and $5.2 million, respectively, of cash received related to the active life cohort volatility agreement with Commonwealth as a result of the Closed Block individual disability reinsurance transaction.

In September 2022, we purchased, and the Trust retired, $14.0 million aggregate liquidation amount of our 7.405% capital securities due 2038, for which we paid an additional $1.2 million in cash associated with the early retirement of this debt.

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In August 2022, we entered into a five-year $350.0 million senior unsecured delayed draw term loan facility with a syndicate of lenders. Also in August 2022, we drew the entire amount of the term loan facility and used the proceeds to redeem $350.0 million aggregate principal amount of our 4.000% senior notes due 2024, for which we paid an additional $2.4 million in cash associated with the early retirement of this debt.

Ratings

AM Best, Fitch Ratings (Fitch), Moody's Investors Service (Moody's), and Standard & Poor's Rating Services (S&P) are among the third parties that assign issuer credit ratings to Unum Group and financial strength ratings to our insurance subsidiaries. Issuer credit ratings reflect an agency's opinion of the overall financial capacity of a company to meet its senior debt obligations. Financial strength ratings are specific to each individual insurance subsidiary and reflect each rating agency's view of the overall financial strength (capital levels, earnings, growth, investments, business mix, operating performance, and market position) of the insuring entity and its ability to meet its obligations to policyholders. Both the issuer credit ratings and financial strength ratings incorporate quantitative and qualitative analyses by rating agencies and are routinely reviewed and updated on an ongoing basis.

We compete based in part on the financial strength ratings provided by rating agencies. A downgrade of our financial strength ratings can be expected to adversely affect us and could potentially, among other things, adversely affect our relationships with distributors of our products and services and retention of our sales force, negatively impact persistency and new sales, particularly large case group sales and individual sales, and generally adversely affect our ability to compete. A downgrade in the issuer credit rating assigned to Unum Group can be expected to adversely affect our cost of capital or our ability to raise additional capital.

The table below reflects the outlook as well as the issuer credit ratings for Unum Group and the financial strength ratings for each of our traditional insurance subsidiaries as of the date of this filing. 

	AM Best	Fitch	Moody's	S&P
Outlooks	Stable	Positive	Stable	Stable
Issuer Credit Ratings	bbb+	BBB-	Baa3	BBB
Financial Strength Ratings
Provident Life and Accident Insurance Company	A	A-	A3	A
Provident Life and Casualty Insurance Company	A	A-	NR	NR
Unum Life Insurance Company of America	A	A-	A3	A
First Unum Life Insurance Company	A	A-	A3	A
Colonial Life & Accident Insurance Company	A	A-	A3	A
The Paul Revere Life Insurance Company	A	A-	A3	A
Starmount Life Insurance Company	A	NR	NR	NR
Unum Insurance Company	A	A-	A3	NR
Unum Limited	NR	NR	NR	A-

NR = not rated

We maintain an ongoing dialogue with the four rating agencies that evaluate us in order to inform them of progress we are making regarding our strategic objectives and financial plans as well as other pertinent issues. A significant component of our communications involves our annual review meeting with each of the four agencies. We hold other meetings throughout the year regarding our business, including, but not limited to, quarterly updates.

In August 2023, AM Best upgraded its long-term issuer credit rating to bbb+ from bbb and also affirmed its financial strength ratings for our domestic insurance subsidiaries. The credit rating upgrade reflects improved risk-adjusted capitalization, stable asset quality, strong financial flexibility, and enhanced liquidity. Following the upgrade, the outlook for the long-term issuer credit rating was revised to stable from positive, while the outlook for financial strength rating remains stable.

There have been no other changes in the rating agencies' outlooks or ratings during 2023 prior to the date of this filing.

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Agency ratings are not directed toward the holders of our securities and are not recommendations to buy, sell, or hold our securities. Each rating is subject to revision or withdrawal at any time by the assigning rating organization, and each rating should be regarded as an independent assessment, not conditional on any other rating. Given the dynamic nature of the ratings process, changes by these or other rating agencies may or may not occur in the near-term. We have ongoing dialogue with the rating agencies concerning our insurance risk profile, our financial flexibility, our operating performance, and the quality of our investment portfolios. The rating agencies provide specific criteria and, depending on our performance relative to the criteria, will determine future negative or positive rating agency actions.

See our annual report on Form 10-K for the year ended December 31, 2022 for further information regarding our debt, issuer credit ratings and financial strength ratings and the risks associated with rating changes.

ITEM 3. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

The adoption of ASU 2018-12 required an update of the discount rate assumptions related to our liability for future policy benefits at each reporting date using a yield that is reflective of an upper-medium grade fixed-income instrument, which is generally equivalent to a single-A interest rate matched to the duration of certain of our insurance liabilities. As such, the value of certain of our insurance liabilities may be adversely affected by changes in the single-A interest rate environment which could impact the valuation of our liability for future policy benefits and reinsurance recoverable.

We measure the insurance liabilities' market risk related to changes in interest rates using a sensitivity analysis, which is based on a hypothetical immediate increase of 100 basis points in interest rates from December 31, 2022 levels. The selection of a 100 basis point immediate parallel change in interest rates should not be construed as our prediction of future market events, but only as an illustration of the potential effect of such an event. Our liability for future policy benefits and our reinsurance recoverable of $38.6 billion and $9.6 billion, respectively, would decrease approximately $4.0 billion and $0.9 billion, respectively, with a 100 basis point increase in interest rates as of December 31, 2022.

Other than the aforementioned impact of the adoption of ASU 2018-12, during the first nine months of 2023, there were no substantive changes to our market risk or the management of this risk. With respect to our exposure to market risk, see the discussion under "Investments" in Item 2 of this Form 10-Q and in Part II, Item 7A of our annual report on Form 10-K for the year ended December 31, 2022.

ITEM 4. CONTROLS AND PROCEDURES

Under the supervision and with the participation of our management, including our Chief Executive Officer and Chief Financial Officer, we have evaluated the effectiveness of our disclosure controls and procedures, as defined in Rule 13a-15(e) under the Securities Exchange Act of 1934, as amended, as of the end of the period covered by this report. We evaluated those controls based on the 2013 Internal Control - Integrated Framework from the Committee of Sponsoring Organizations of the Treadway Commission. Based on that evaluation, these officers concluded that our disclosure controls and procedures were effective as of September 30, 2023.

There have been no changes in our internal control over financial reporting, as defined in Rule 13a-15(f) under the Securities Exchange Act of 1934, as amended, during the quarter ended September 30, 2023 that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

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PART II - OTHER INFORMATION

ITEM 1. LEGAL PROCEEDINGS

Refer to Part I, Item 1, Note 13 of the "Notes to Consolidated Financial Statements" for information on legal proceedings.

ITEM 1A. RISK FACTORS

There have been no material changes from the risk factors disclosed in our annual report on Form 10-K for the year ended December 31, 2022.

ITEM 2. UNREGISTERED SALES OF EQUITY SECURITIES AND USE OF PROCEEDS

The following table provides information about our share repurchase activity for the third quarter of 2023.

	(a) Total Number of Shares Purchased	(b) Average Price Paid per Share (1) (3)		(c) Total Number of Shares Purchased as Part of Publicly Announced Program (2)	(d) Approximate Dollar Value of Shares that May Yet Be Purchased Under the Program (1) (2) (3)
July 1 - July 31, 2023	949,230	$	47.90	949,230	$	91,835,772
August 1 - August 31, 2023	179,331	49.22		179,331	83,008,901
September 1 - September 30, 2023	409,533	48.20		409,533	75,931,571
Total	1,538,094			1,538,094

(1) Excludes the cost of commissions and excise tax.

(2) In December 2022, our board of directors authorized the repurchase of up to $200.0 million of Unum Group's outstanding common stock beginning January 2023. In February 2023, our board of directors authorized an increase to the share repurchase program such that we are now authorized to repurchase up to $250.0 million of Unum Group's outstanding common stock. This share repurchase program has an expiration date of December 31, 2023.

(3) In July 2023, we entered into an accelerated repurchase agreement. As part of this transaction, we paid $50.0 million to a financial counterparty, which resulted in an immediate, corresponding reduction to the remaining authorized repurchase amount, and received an initial delivery of 781,250 shares of our common stock, which represented approximately 75 percent of the total delivery under the agreement. The final price adjustment settlement, along with the delivery of the remaining shares, occurred in September 2023, resulting in the delivery to us of 264,995 additional shares. In total, we repurchased 1,046,205 shares pursuant to the July 2023 accelerated share repurchase agreement. The remaining shares repurchased during the third quarter of 2023 were purchased in open market transactions.

ITEM 5. OTHER INFORMATION

On August 4, 2023, Elizabeth C. Ahmed, our EVP, People & Communications, adopted a Rule 10b5-1 trading arrangement intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). The trading arrangement provides for the sale of up to 5,000 shares of our common stock between November 6, 2023 and August 2, 2024.

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Table of Contents

ITEM 6. EXHIBITS

Index to Exhibits
(31.1)	Certification of Chief Executive Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
(31.2)	Certification of Chief Financial Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
(32.1)	Certification of Chief Executive Officer pursuant to 18 U.S.C. Section 1350 as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
(32.2)	Certification of Chief Financial Officer pursuant to 18 U.S.C. Section 1350 as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
(101)	The instance document does not appear in the interactive data file because its XBRL tags are embedded within the inline XBRL document.
(104)	Cover Page Interactive Data File (formatted as Inline XBRL and contained in Exhibit 101).

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SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

	Unum Group
	(Registrant)
Date: November 1, 2023	By:	/s/ Steven A. Zabel
		Steven A. Zabel
		Executive Vice President, Chief Financial Officer
Date: November 1, 2023	By:	/s/ Walter L. Rice, Jr.
		Walter L. Rice, Jr.
		Senior Vice President, Chief Accounting Officer

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EX-31.1

EXHIBIT 31.1

CERTIFICATION

I, Richard P. McKenney, certify that:

1. I have reviewed this quarterly report on Form 10-Q of Unum Group;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant's other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c) Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d) Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and

5. The registrant's other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):

(a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

(b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

Date: November 1, 2023	/s/ Richard P. McKenney
	Richard P. McKenney
	President and Chief Executive Officer

A signed original of this written statement required by Section 302 of the Sarbanes-Oxley Act of 2002 has been provided to Unum Group and will be retained by Unum Group and furnished to the Securities and Exchange Commission or its staff upon request.

EX-31.2

EXHIBIT 31.2

CERTIFICATION

I, Steven A. Zabel, certify that:

1. I have reviewed this quarterly report on Form 10-Q of Unum Group;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant's other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c) Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d) Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and

5. The registrant's other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):

(a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

(b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

Date: November 1, 2023	/s/ Steven A. Zabel
	Steven A. Zabel
	Executive Vice President, Chief Financial Officer

A signed original of this written statement required by Section 302 of the Sarbanes-Oxley Act of 2002 has been provided to Unum Group and will be retained by Unum Group and furnished to the Securities and Exchange Commission or its staff upon request.

EX-32.1

EXHIBIT 32.1

STATEMENT OF CHIEF EXECUTIVE OFFICER

OF UNUM GROUP

PURSUANT TO 18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

§ 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report of Unum Group (the Company) on Form 10-Q for the period ended September 30, 2023 as filed with the Securities and Exchange Commission on the date hereof (the Report), the undersigned, Richard P. McKenney, President and Chief Executive Officer of the Company, certifies, pursuant to 18 U.S.C. § 1350, as adopted pursuant to § 906 of the Sarbanes-Oxley Act of 2002, that:

1. The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

2. The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Date: November 1, 2023	/s/ Richard P. McKenney
	Richard P. McKenney
	President and Chief Executive Officer

A signed original of this written statement required by Section 906 of the Sarbanes-Oxley Act of 2002 has been provided to Unum Group and will be retained by Unum Group and furnished to the Securities and Exchange Commission or its staff upon request.

EX-32.2

EXHIBIT 32.2

STATEMENT OF CHIEF FINANCIAL OFFICER

OF UNUM GROUP

PURSUANT TO 18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

§ 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report of Unum Group (the Company) on Form 10-Q for the period ended September 30, 2023 as filed with the Securities and Exchange Commission on the date hereof (the Report), the undersigned, Steven A. Zabel, Executive Vice President and Chief Financial Officer of the Company, certifies, pursuant to 18 U.S.C. § 1350, as adopted pursuant to § 906 of the Sarbanes-Oxley Act of 2002, that:

1. The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

2. The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Date: November 1, 2023	/s/ Steven A. Zabel
	Steven A. Zabel
	Executive Vice President, Chief Financial Officer

A signed original of this written statement required by Section 906 of the Sarbanes-Oxley Act of 2002 has been provided to Unum Group and will be retained by Unum Group and furnished to the Securities and Exchange Commission or its staff upon request.

XML

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2023	Oct. 30, 2023
Entity Information
Document Type	10-Q
Document Quarterly Report	true
Amendment Flag	false
Document Period End Date	Sep. 30, 2023
Document Fiscal Year Focus	2023
Current Fiscal Year End Date	--12-31
Document Fiscal Period Focus	Q3
Document Transition Report	false
Entity File Number	001-11294
Entity Registrant Name	Unum Group
Entity Central Index Key	0000005513
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	62-1598430
Entity Address, Address Line One	1 Fountain Square
Entity Address, City or Town	Chattanooga,
Entity Address, State or Province	TN
Entity Address, Postal Zip Code	37402
City Area Code	423
Local Phone Number	294-1011
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		195,045,646
NEW YORK STOCK EXCHANGE, INC. | Common Class A
Entity Information
Trading Symbol	UNM
Security Exchange Name	NYSE
Title of 12(b) Security	Common stock, $0.10 par value
NEW YORK STOCK EXCHANGE, INC. | 6.250% Junior Subordinated Notes due 2058
Entity Information
Trading Symbol	UNMA
Security Exchange Name	NYSE
Title of 12(b) Security	6.250% Junior Subordinated Notes due 2058

XML

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Investments
Fixed Maturity Securities - at fair value (amortized cost of $38,224.3; $37,825.2; allowance for credit losses of $—; $—)	$ 34,070.7	$ 34,840.8
Mortgage Loans (net of allowance for credit losses of $10.2; $9.3)	2,321.5	2,435.4
Policy Loans	3,596.6	3,601.2
Other Long-term Investments	1,506.9	1,440.1
Short-term Investments	1,487.2	1,394.8
Total Investments	42,982.9	43,712.3
Other Assets
Cash and Bank Deposits	165.9	119.2
Accounts and Premiums Receivable (net of allowance for credit losses of $29.7; $32.5)	1,507.7	1,482.1
Reinsurance Recoverable (net of allowance for credit losses of $1.8; $1.7)	8,855.2	9,608.0
Accrued Investment Income	704.9	615.0
Deferred Acquisition Costs	2,668.7	2,560.0
Goodwill	347.9	347.6
Property and Equipment	463.3	451.7
Deferred Income Tax	617.1	586.0
Other Assets	1,640.9	1,666.6
Total Assets	59,954.5	61,148.5
Liabilities
Future Policy Benefits	36,502.4	38,577.1	[1]
Policyholders' Account Balances	5,744.5	5,740.2	[1]
Unearned Premiums	447.2	365.5
Other Policyholders’ Funds	1,631.9	1,750.4
Income Tax Payable	267.2	190.9
Deferred Income Tax	27.1	25.2
Short-term debt	2.0	2.0
Long-term Debt	3,429.8	3,427.8
Other Liabilities	2,284.3	2,334.4
Total Liabilities	50,336.4	52,413.5
Commitments and Contingent Liabilities - Note 13
Stockholders' Equity
Common Stock, $0.10 par; authorized: 725,000,000 shares; issued: 309,486,850 and 308,306,490 shares	30.9	30.8
Additional Paid-in Capital	2,454.3	2,441.0
Accumulated Other Comprehensive Loss	(3,150.6)	(3,448.3)
Retained Earnings	13,888.7	13,141.3
Treasury Stock - at cost: 114,469,894 and 110,551,977 shares	(3,605.2)	(3,429.8)
Total Stockholders' Equity	9,618.1	8,735.0
Total Liabilities and Stockholders' Equity	$ 59,954.5	$ 61,148.5

[1] 1We previously reported policy and contract benefits and reserves for future policy and contract benefits liabilities in our consolidated balance sheet as of December 31, 2022 of $1,839.8 million and $42,330.2 million, respectively, resulting in total policyholder liabilities of $44,170.0 million. These balances were reclassified into new line items, future policy benefits and policyholders' account balances, which would have reported balances of $38,443.2 million and $5,726.8 million, respectively, as of December 31, 2022, resulting in total policyholder liabilities of $44,170.0 million under the historical accounting method.

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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Investments
Amortized Cost of Fixed Maturity Securities	$ 38,224.3	$ 37,825.2
Debt Securities, Available-for-sale, Allowance for credit losses for Fixed Maturity Securities	0.0	0.0
Other Assets
Accounts and Premiums Receivable (net of allowance for credit losses of $29.7; $32.5)	1,507.7	1,482.1
Premium Receivable, Allowance for Credit Loss	29.7	32.5
Reinsurance Recoverable, Allowance for Credit Loss	$ 1.8	$ 1.7
Stockholders' Equity
Common Stock, Par Value (in dollars per share)	$ 0.10	$ 0.10
Common Stock, Shares Authorized	725,000,000	725,000,000
Common Stock, Shares Issued	309,486,850	308,306,490
Treasury Stock, Common, Shares	114,469,894	110,551,977

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CONSOLIDATED STATEMENTS OF INCOME (UNAUDITED) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Revenue
Premium Income	$ 2,525.9	$ 2,388.9	$ 7,494.3	$ 7,206.3
Net Investment Income	526.0	511.6	1,565.9	1,597.8
Net Investment Loss	(31.0)	(4.4)	(30.0)	(22.3)
Other Income	71.6	63.0	210.6	197.5
Total Revenue	3,092.5	2,959.1	9,240.8	8,979.3
Benefits and Expenses
Policy Benefits	1,778.6	1,843.2	5,498.6	5,691.9
Policy Benefits - Remeasurement Loss (Gain)	168.4	(341.7)	(61.6)	(476.1)
Commissions	289.7	271.5	869.7	819.1
Interest and Debt Expense	48.6	47.0	145.6	141.3
Cost Related to Early Retirement of Debt	0.0	4.2	0.0	4.2
Deferral of Acquisition Costs	(153.3)	(139.4)	(467.5)	(419.1)
Amortization of Deferred Acquisition Costs	129.1	102.9	358.7	313.0
Compensation Expense	297.9	285.9	867.3	794.1
Other Expenses	271.8	243.9	818.6	734.4
Total Benefits and Expenses	2,830.8	2,317.5	8,029.4	7,602.8
Income Before Income Tax	261.7	641.6	1,211.4	1,376.5
Income Tax
Current	187.5	156.9	381.7	383.8
Deferred	(127.8)	(25.6)	(123.5)	(125.3)
Total Income Tax	59.7	131.3	258.2	258.5
Net Income	$ 202.0	$ 510.3	$ 953.2	$ 1,118.0
Net Income Per Common Share
Basic	$ 1.03	$ 2.55	$ 4.83	$ 5.55
Assuming Dilution	$ 1.02	$ 2.53	$ 4.81	$ 5.52

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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Statement of Comprehensive Income [Abstract]
Net Income	$ 202.0	$ 510.3	$ 953.2	$ 1,118.0
Other Comprehensive Income (Loss)
Change in Net Unrealized Loss on Securities (net of tax benefit of $313.8; $520.8; $249.2; $2,017.2)	(1,185.8)	(1,925.9)	(920.0)	(7,500.7)
Change in the Effect of Discount Rate Assumptions on the Liability for Future Policy Benefits, Net of Reinsurance (net of tax expense of $445.0; $599.4; $368.2; $2,485.7)	1,688.4	2,222.9	1,374.6	9,252.4
Change in Net Loss on Hedges (net of tax benefit of $38.9; $8.1; $44.7; $12.6)	(144.4)	(32.9)	(168.1)	(48.3)
Change in Foreign Currency Translation Adjustment (net of tax expense (benefit) of $(0.7); $5.4; $0.3; $11.5)	(55.1)	(71.5)	7.9	(164.9)
Change in Unrecognized Pension and Postretirement Benefit Costs (net of tax expense of $1.2; $1.1; $1.1; $4.0)	(3.9)	(5.9)	(3.3)	(15.1)
Net Other Comprehensive Income (Loss)	307.0	198.5	297.7	1,553.6
Comprehensive Income (Loss)	$ 509.0	$ 708.8	$ 1,250.9	$ 2,671.6

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STATEMENT OF COMPREHENSIVE INCOME (Parenthetical) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Statement of Comprehensive Income [Abstract]
Change in Net Unrealized Gain on Securities After Adjustment, Tax Expense (Benefit)	$ (313.8)	$ (520.8)	$ (249.2)	$ (2,017.2)
OCI, Liability for Future Policy Benefit, Gain (Loss), after REclassification Adjustment, Tax	445.0	599.4	368.2	2,485.7
Change in Net Gain on Hedges, Tax Benefit	(38.9)	(8.1)	(44.7)	(12.6)
Change in Foreign Currency Translation Adjustment, Tax Expense	0.7	(5.4)	(0.3)	(11.5)
Change in Unrecognized Pension and Postretirement Benefit costs, Tax Expense	$ (1.2)	$ (1.1)	$ (1.1)	$ (4.0)

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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Millions	Total		Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Income (Loss)	Retained Earnings	Treasury Stock, Common
Balance at Beginning of Year at Dec. 31, 2021			$ 30.7	$ 2,408.1	$ (5,164.6)	$ 11,989.4	$ (3,229.7)
Increase (Decrease) in Stockholders' Equity
Common Stock Activity			0.1	24.2
Other Comprehensive Income	$ 1,553.6
Net Income	1,118.0					1,118.0
Dividends to Stockholders (per common share: $0.365; $0.330; $1.025; $0.930)						(189.5)
Cost of Shares Repurchased	137.5	[1]					137.5
Balance at End of Year at Sep. 30, 2022	8,402.8		30.8	2,432.3	(3,611.0)	12,917.9	(3,367.2)
Balance at Beginning of Year at Jun. 30, 2022			30.8	2,417.4	(3,809.5)	12,473.7	(3,324.6)
Increase (Decrease) in Stockholders' Equity
Common Stock Activity			0.0	14.9
Other Comprehensive Income	198.5				198.5
Net Income	510.3					510.3
Dividends to Stockholders (per common share: $0.365; $0.330; $1.025; $0.930)						(66.1)
Cost of Shares Repurchased	42.6	[1]					42.6
Balance at End of Year at Sep. 30, 2022	8,402.8		30.8	2,432.3	(3,611.0)	12,917.9	(3,367.2)
Balance at Beginning of Year at Dec. 31, 2022	8,735.0		30.8	2,441.0	(3,448.3)	13,141.3	(3,429.8)
Increase (Decrease) in Stockholders' Equity
Common Stock Activity			0.1	13.3
Other Comprehensive Income	297.7				297.7
Net Income	953.2					953.2
Dividends to Stockholders (per common share: $0.365; $0.330; $1.025; $0.930)						(205.8)
Cost of Shares Repurchased	175.4	[1]					175.4
Balance at End of Year at Sep. 30, 2023	9,618.1		30.9	2,454.3	(3,150.6)	13,888.7	(3,605.2)
Balance at Beginning of Year at Jun. 30, 2023			30.9	2,444.9	(3,457.6)	13,758.1	(3,530.4)
Increase (Decrease) in Stockholders' Equity
Common Stock Activity			0.0	9.4
Other Comprehensive Income	307.0				307.0
Net Income	202.0					202.0
Dividends to Stockholders (per common share: $0.365; $0.330; $1.025; $0.930)						(71.4)
Cost of Shares Repurchased	74.8	[1]					74.8
Balance at End of Year at Sep. 30, 2023	$ 9,618.1		$ 30.9	$ 2,454.3	$ (3,150.6)	$ 13,888.7	$ (3,605.2)

[1] 1Includes a de minimis amount and $0.1 million of commissions for the three and nine months ended September 30, 2023, respectively, and a de minimis amount and $0.1 million of commissions for the three and nine months ended September 30, 2022, respectively. There was $0.7 million and $1.2 million of excise tax for the three and nine months ended September 30, 2023, respectively. There were no excise taxes during the three and nine months ended September 30, 2022.

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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Parenthetical) - $ / shares	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Statement of Stockholders' Equity [Abstract]
Common Stock, Dividends, Per Share, Cash Paid	$ 0.365	$ 0.330	$ 1.025	$ 0.930

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CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Cash Flows from Operating Activities
Net Income	$ 953.2	$ 1,118.0
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities
Change in Receivables	455.9	457.9
Deferred Policy Acquisition Cost	(108.8)	(106.1)
Change in Insurance Liabilities	(169.3)	(112.6)
Change in Income Taxes	(26.9)	7.3
Change in Other Accrued Liabilities	(150.2)	(135.0)
Non-cash Components of Net Investment Income	(262.9)	(293.0)
Net Investment Loss	30.0	22.3
Depreciation	80.9	83.5
Amortization of the Cost of Reinsurance	33.1	38.5
Other, Net	24.3	(19.0)
Net Cash Provided by Operating Activities	859.3	1,061.8
Cash Flows from Investing Activities
Proceeds from Sale of Debt Securities, Available-for-sale	1,013.5	453.4
Proceeds from Maturities of Fixed Maturity Securities	1,113.9	1,125.6
Proceeds from Sales and Maturities of Other Investments	275.2	306.4
Payments to Acquire Debt Securities, Available-for-sale	(2,439.4)	(2,380.5)
Purchases of Other Investments	(227.1)	(342.7)
Net Maturities and Sales (Purchases) of Short-term Investments	(45.2)	204.9
Net Increase (Decrease) in Payables for Collateral on Investments	(100.4)	12.5
Net Purchases of Property and Equipment	(89.1)	(70.8)
Net Cash Used by Investing Activities	(498.6)	(691.2)
Cash Flows from Financing Activities
Issuance of Long-term Debt	0.0	349.2
Repayments of Long-term Debt	0.0	364.0
Cost Related to Early Retirement of Debt	0.0	3.6
Issuance of Common Stock	4.1	2.7
Repurchase of Common Stock	(174.2)	(136.1)
Dividends Paid to Stockholders	(205.7)	(188.4)
Proceeds from Policyholder Account Deposits	109.3	90.9
Payments for Policyholder Account Withdrawals	(65.2)	(55.6)
Cash Received Related to Active Life Volatility Cover Agreement	18.6	5.2
Other, Net	(0.9)	(2.6)
Net Cash Used by Financing Activities	(314.0)	(302.3)
Net Increase (Decrease) in Cash and Bank Deposits	46.7	68.3
Cash and Bank Deposits at Beginning of Year	119.2	75.0
Cash and Bank Deposits at End of Period	$ 165.9	$ 143.3

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Basis of Presentation

9 Months Ended

Sep. 30, 2023

Accounting Policies [Abstract]

Basis of Presentation

The accompanying consolidated financial statements of Unum Group and its subsidiaries (the Company) have been prepared in accordance with U.S. generally accepted accounting principles (GAAP) for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by GAAP for complete financial statements. For further information, refer to the consolidated financial statements and footnotes included in our annual report on Form 10-K for the year ended December 31, 2022.

In our opinion, all adjustments (consisting of normal recurring accruals) considered necessary for a fair presentation have been included. Interim results are not necessarily indicative of full year performance.

XML

Accounting Developments

9 Months Ended

Sep. 30, 2023

Accounting Developments and New Accounting Policies [Abstract]

Accounting Developments

Note 2 - Accounting Developments

Accounting Standards Updates (ASUs) Adopted in 2023:

ASU 2022-02, Financial Instruments - Credit Losses (Topic 326): Troubled Debt Restructurings and Vintage Disclosures

The amendments in this update eliminated the troubled debt restructuring recognition and measurement guidance and instead required that an entity evaluate whether the modification represents a new loan or the continuation of an existing loan. The amendments also enhanced the disclosure requirements related to certain modifications of receivables made to borrowers experiencing financial difficulty. In addition, the amendments in this update required that an entity disclose current-period gross write-offs by year of origination for financing receivables and net investment in leases. The amendments in this update were applied prospectively in the period of adoption as of January 1, 2023. The adoption of this update modified our disclosures but did not have an impact on our financial position or results of operations.

ASU 2018-12, Financial Services—Insurance (Topic 944): Targeted Improvements to the Accounting for Long-Duration Contracts and related amendments

This update significantly amended the accounting and disclosure requirements for long-duration insurance contracts. These changes included a requirement to review, and if necessary, update cash flow assumptions used to measure the liability for future policy benefits for traditional and limited-payment contracts at least annually, with changes recognized in earnings. In addition, an entity is required to update the discount rate assumption at each reporting date using a yield that is reflective of an upper-medium grade fixed-income instrument, with changes recognized in other comprehensive income (loss) (OCI). These changes resulted in the elimination of the provision for risk of adverse deviation and premium deficiency (or loss recognition) testing for traditional long-duration insurance contracts. The update also required that an entity measure all market risk benefits associated with deposit contracts at fair value, with changes recognized in earnings except for the portion attributable to a change in the instrument-specific credit risk, which is to be recognized in OCI. This update also simplified the amortization of deferred acquisition costs by requiring amortization on a constant level basis over the expected term of the related contracts. Deferred acquisition costs are required to be written off for unexpected contract terminations, but are no longer subject to an impairment test. Significant additional disclosures are required, which include disaggregated rollforwards of certain liability balances and the disclosure of qualitative and quantitative information about expected cash flows, estimates, and assumptions. We do not have products with market risk benefits. The update was effective for periods beginning January 1, 2023.

We adopted this guidance effective January 1, 2023 using the modified retrospective approach with changes applied as of January 1, 2021, also referred to as the transition date. The following tables summarize the impacts of the adoption of ASU 2018-12 on the liability for future policy benefits, deferred acquisition costs, and stockholders' equity as of the transition date as well as impacted historical condensed consolidated financial statement line items for historical comparison.

All historically reported information included throughout these financial statements has been adjusted for the impacts of our modified retrospective adoption of ASU 2018-12.

Impact of the Adoption of ASU 2018-12 as of the Transition Date:

Stockholders' Equity

The following table summarizes the changes in stockholders' equity due to the adoption of ASU 2018-12 and the resulting adjusted balances at January 1, 2021:

	Consolidated
	Retained Earnings		Accumulated Other Comprehensive Income (Loss)		Total Stockholders' Equity
	(in millions of dollars)
Balance at December 31, 2020	$	11,269.6	$	374.2	$	10,871.0
Impact of the Adoption of ASU 2018-12	(20.6)		(6,684.4)		(6,705.0)
Balance at January 1, 2021	$	11,249.0	$	(6,310.2)	$	4,166.0

Liability for Future Policy Benefits

The following tables summarize the changes in the liability for future policy benefits due to the adoption of ASU 2018-12 and the resulting adjusted balance at January 1, 2021. The removal of shadow adjustments and effect of change in discount rate assumptions are both recorded as transition adjustments to accumulated other comprehensive income (loss) (AOCI) while the adjustments for loss contracts are recorded as a transition adjustment to retained earnings.

	Unum US		Unum International		Colonial Life		Closed Block		Consolidated
	(in millions of dollars)
Balance at December 31, 20201	$	12,184.6	$	2,969.8	$	1,977.2	$	28,572.8	$	45,704.4
Removal of Shadow Adjustments2	(1,569.7)		(545.8)		(44.5)		(4,065.6)		(6,225.6)
Adjustments for Loss Contracts3	—		—		34.9		—		34.9
Effect of Change in Discount Rate Assumptions	2,251.8		779.4		568.6		12,484.8		16,084.6
Other4	(5.3)		—		(7.6)		—		(12.9)
Balance at January 1, 2021	12,861.4		3,203.4		2,528.6		36,992.0		55,585.4
Reinsurance Recoverable5	357.7		132.5		4.4		10,001.4		10,496.0
Balance, Net of Reinsurance, at January 1, 2021	$	12,503.7	$	3,070.9	$	2,524.2	$	26,990.6	$	45,089.4
1We previously reported policy and contract benefits and reserves for future policy and contract benefits liabilities in our consolidated balance sheet as of December 31, 2020 of $1,855.4 million and $49,653.0 million, respectively, resulting in total policyholder liabilities of $51,508.4 million. These balances were reclassified into new line items, future policy benefits and policyholders' account balances, which would have reported balances of $45,704.4 million and $5,804.0 million as of December 31, 2020, respectively, resulting in total policyholder liabilities of $51,508.4 million under the historical accounting method. These balances were reclassified to more closely align with the new disclosure requirements of ASU 2018-12.
2Shadow adjustments represent the adjustments related to unrealized investment gains and losses previously included in the reserves balance prior to the adoption of ASU 2018-12.
3Adjustment for loss contracts represents the adjustment for those cohorts whose net premium ratio exceeded 100 percent as of the transition date. For those cohorts, the net premiums were set equal to the gross premiums and the difference was recorded as a transition adjustment to the liability for future policy benefits.
4This amount reflects the effect of the reclassification of certain unearned premium. This amount was reclassified to more closely align with the presentation of liabilities under ASU 2018-12 and had no impact to stockholders' equity.
5These amounts represent the portion of reinsurance recoverable related to the liability for future policy benefits. These amounts include the adjustments for the removal of shadow adjustments and for the effect of change in discount rate assumptions for the liability for future policy benefits ceded to third party reinsurers.

	Unum US Segment
	Group Disability		Group Life and AD&D		Individual Disability		Voluntary Benefits		Dental and Vision		Total
	(in millions of dollars)
Balance at December 31, 2020	$	7,409.0	$	1,123.9	$	2,485.3	$	1,154.9	$	11.5	$	12,184.6
Removal of Shadow Adjustments	(1,025.2)		(88.5)		(446.1)		(9.9)		—		(1,569.7)
Effect of Change in Discount Rate Assumptions	911.9		91.9		728.5		519.5		—		2,251.8
Other	—		—		—		(5.3)		—		(5.3)
Balance at January 1, 2021	7,295.7		1,127.3		2,767.7		1,659.2		11.5		12,861.4
Reinsurance Recoverable	58.3		3.0		260.6		35.7		0.1		357.7
Balance, Net of Reinsurance, at January 1, 2021	$	7,237.4	$	1,124.3	$	2,507.1	$	1,623.5	$	11.4	$	12,503.7

	Closed Block Segment
	Long-term Care		All Other		Total
	(in millions of dollars)
Balance at December 31, 2020	$	16,283.4	$	12,289.4	$	28,572.8
Removal of Shadow Adjustments	(3,465.4)		(600.2)		(4,065.6)
Effect of Change in Discount Rate Assumptions	9,922.9		2,561.9		12,484.8
Balance at January 1, 2021	22,740.9		14,251.1		36,992.0
Reinsurance Recoverable	44.4		9,957.0		10,001.4
Balance, Net of Reinsurance, at January 1, 2021	$	22,696.5	$	4,294.1	$	26,990.6

Deferred Acquisition Costs (DAC)

The following tables summarize the changes in DAC due to the adoption of ASU 2018-12 and the resulting adjusted balance at January 1, 2021. The removal of shadow adjustments is recorded as a transition adjustment to AOCI.

	Unum US1		Unum International		Colonial Life		Consolidated
	(in millions of dollars)
Balance at December 31, 2020	$	1,168.7	$	32.0	$	1,071.9	$	2,272.6
Removal of Shadow Adjustments	12.3		—		72.8		85.1
Balance at January 1, 2021	$	1,181.0	$	32.0	$	1,144.7	$	2,357.7
1The $12.3 million removal of shadow adjustments is related to the Unum US voluntary benefits product line.

Impact of the Adoption of ASU 2018-12 on Historical Financial Statements:

The following tables present the effect of the adoption of ASU 2018-12 on our historical consolidated financial statements:

	September 30, 2022
	Historical Accounting Method		As Adjusted		Effect of Change
	(in millions of dollars)
Consolidated Balance Sheets
Assets
Reinsurance Recoverable	$	10,289.7	$	9,574.1	$	(715.6)
Deferred Acquisition Costs	2,254.6		2,526.5		271.9
Deferred Income Tax	523.1		601.2		78.1
Other Assets1	1,797.6		1,674.4		(123.2)
Total Assets	60,866.7		60,377.9		(488.8)
Liabilities
Policy and Contract Benefits2	$	1,771.4	$	—	$	(1,771.4)
Reserves for Future Policy and Contract Benefits2	42,108.7		—		(42,108.7)
Future Policy Benefits2	—		37,808.0		37,808.0
Policyholders' Account Balances2	—		5,812.8		5,812.8
Unearned Premiums	394.0		406.8		12.8
Deferred Income Tax	6.5		20.9		14.4
Total Liabilities	52,207.2		51,975.1		(232.1)
Stockholders' Equity
Accumulated Other Comprehensive Loss	$	(3,134.7)	$	(3,611.0)	$	(476.3)
Retained Earnings	12,698.3		12,917.9		219.6
Total Stockholders' Equity	8,659.5		8,402.8		(256.7)
1The change in other assets is driven by the cost of reinsurance associated with the second phase of our Closed Block individual disability reinsurance transaction which was completed in the first quarter of 2021. In accordance with the provisions of the ASU related to non-contemporaneous reinsurance, we were then required to establish the ceded reserves using an upper-medium grade fixed-income instrument as of the reinsurance transaction date in March 2021 which resulted in higher ceded reserves compared to that which was reported historically.
2We previously reported policy and contract benefits and reserves for future policy and contract benefits liabilities in our consolidated balance sheet as of September 30, 2022 of $1,771.4 million and $42,108.7 million, respectively, resulting in total policyholder liabilities of $43,880.1 million. These balances were reclassified into new line items, future policy benefits and policyholders' account balances, which would have reported balances of $38,079.8 million and $5,800.3 million, respectively, as of September 30, 2022, resulting in total policyholder liabilities of $43,880.1 million under the historical accounting method.

	December 31, 2022
	Historical Accounting Method		As Adjusted		Effect of Change
	(in millions of dollars)
Consolidated Balance Sheets
Assets
Reinsurance Recoverable	$	10,218.6	$	9,608.0	$	(610.6)
Deferred Acquisition Costs	2,252.3		2,560.0		307.7
Deferred Income Tax	449.8		586.0		136.2
Other Assets	1,786.3		1,666.6		(119.7)
Total Assets	61,434.9		61,148.5		(286.4)
Liabilities
Policy and Contract Benefits1	$	1,839.8	$	—	$	(1,839.8)
Reserves for Future Policy and Contract Benefits1	42,330.2		—		(42,330.2)
Future Policy Benefits1	—		38,577.1		38,577.1
Policyholders' Account Balances1	—		5,740.2		5,740.2
Unearned Premiums	352.7		365.5		12.8
Deferred Income Tax	9.2		25.2		16.0
Total Liabilities	52,237.4		52,413.5		176.1
Stockholders' Equity
Accumulated Other Comprehensive Loss	$	(2,756.6)	$	(3,448.3)	$	(691.7)
Retained Earnings	12,912.1		13,141.3		229.2
Total Stockholders' Equity	9,197.5		8,735.0		(462.5)
1We previously reported policy and contract benefits and reserves for future policy and contract benefits liabilities in our consolidated balance sheet as of December 31, 2022 of $1,839.8 million and $42,330.2 million, respectively, resulting in total policyholder liabilities of $44,170.0 million. These balances were reclassified into new line items, future policy benefits and policyholders' account balances, which would have reported balances of $38,443.2 million and $5,726.8 million, respectively, as of December 31, 2022, resulting in total policyholder liabilities of $44,170.0 million under the historical accounting method.

	Three Months Ended September 30, 2022
	Historical Accounting Method		As Adjusted		Effect of Change
	(in millions of dollars, except share data and where noted)
Consolidated Statements of Income
Premium Income	$	2,391.7	$	2,388.9	$	(2.8)
Policy Benefits1	1,579.3		1,843.2		263.9
Policy Benefits - Remeasurement Gain	—		(341.7)		(341.7)
Amortization of Deferred Acquisition Costs	150.8		102.9		(47.9)
Other Expenses	247.3		243.9		(3.4)
Income Tax - Deferred	(52.3)		(25.6)		26.7
Net Income	410.7		510.3		99.6
Net Income Per Common Share
Basic	$	2.05	$	2.55	$	0.50
Assuming Dilution	$	2.04	$	2.53	$	0.49
Consolidated Statements of Comprehensive Income (Loss)
Net Income	$	410.7	$	510.3	$	99.6
Change in Adjustment to Deferred Acquisition Costs and Reserves for Future Policy and Contract Benefits, Net of Reinsurance	661.4		—		(661.4)
Change in the Effect of Discount Rate Assumptions on the Liability for Future Policy Benefits, Net of Reinsurance	—		2,222.9		2,222.9
Change in Foreign Currency Translation Adjustment	(71.1)		(71.5)		(0.4)
Comprehensive Income (Loss)	(951.8)		708.8		1,660.6
Consolidated Statements of Stockholders' Equity
Accumulated Other Comprehensive Income (Loss)
Balance at Beginning of Period	$	(1,772.2)	$	(3,809.5)	$	(2,037.3)
Other Comprehensive Income (Loss)	(1,362.5)		198.5		1,561.0
Retained Earnings
Balance at Beginning of Period	$	12,353.7	$	12,473.7	$	120.0
Net Income	410.7		510.3		99.6
1 Previously disclosed as Benefits and Change in Reserves for Future Benefits

	Nine Months Ended September 30, 2022
	Historical Accounting Method		As Adjusted		Effect of Change
	(in millions of dollars, except share data and where noted)
Consolidated Statements of Income
Premium Income	$	7,212.3	$	7,206.3	$	(6.0)
Policy Benefits1	5,181.3		5,691.9		510.6
Policy Benefits - Remeasurement Gain	—		(476.1)		(476.1)
Amortization of Deferred Acquisition Costs	449.5		313.0		(136.5)
Other Expenses	744.4		734.4		(10.0)
Income Tax - Deferred	(147.9)		(125.3)		22.6
Net Income	1,034.6		1,118.0		83.4
Net Income Per Common Share
Basic	$	5.14	$	5.55	$	0.41
Assuming Dilution	$	5.11	$	5.52	$	0.41
Consolidated Statements of Comprehensive Income (Loss)
Net Income	$	1,034.6	$	1,118.0	$	83.4
Change in Adjustment to Deferred Acquisition Costs and Reserves for Future Policy and Contract Benefits, Net of Reinsurance	(7,500.7)		—		7,500.7
Change in the Effect of Discount Rate Assumptions on the Liability for Future Policy Benefits, Net of Reinsurance	—		9,252.4		9,252.4
Change in Foreign Currency Translation Adjustment	(164.1)		(164.9)		(0.8)
Comprehensive Income (Loss)	(2,454.2)		2,671.6		5,125.8
Consolidated Statements of Stockholders' Equity
Accumulated Other Comprehensive Income (Loss)
Balance at Beginning of Year	$	354.1	$	(5,164.6)	$	(5,518.7)
Other Comprehensive Income (Loss)	(3,488.8)		1,553.6		5,042.4
Retained Earnings
Balance at Beginning of Year	$	11,853.2	$	11,989.4	$	136.2
Net Income	1,034.6		1,118.0		83.4
Consolidated Statements of Cash Flows
Cash Flows from Operating Activities
Net Income	$	1,034.6	$	1,118.0	$	83.4
Change in Receivables	437.8		457.9		20.1
Change in Deferred Acquisition Costs	30.4		(106.1)		(136.5)
Change in Insurance Liabilities	(125.5)		(112.6)		12.9
Change in Income Taxes	(21.6)		7.3		28.9
Amortization of the Cost of Reinsurance	48.5		38.5		(10.0)
1 Previously disclosed as Benefits and Change in Reserves for Future Benefits

The decrease in AOCI in our recast of 2022 as shown in the preceding charts is driven primarily by the difference between the discount rate applied under the historical accounting method, which was based on an expected investment yield from our current investment strategy, and the single-A discount rate that is required as a part of the adoption of ASU 2018-12. The most significant impact is related to our longest duration products. Our investment strategy reflects the illiquid nature of the majority of our liability cash flows and, as a result, the yields in our investment portfolios supporting the cash outflows required for these products are generally higher than a single-A yield. In addition, the discount rates applied under the historical accounting method to the reserves for our longest duration products, such as long-term care, included an assumption for long-term yields rising to more historical levels.

The net favorable impact of the adoption of ASU 2018-12 to net income for the three and nine months ended September 30, 2022 shown in the preceding charts is due primarily to the following changes:

• Updating the lifetime cohort net premium ratios, or lifetime loss ratio, for actual experience each reporting period will generally cause earnings patterns to be more consistent from period to period, with variances in experience reflected in earnings over the cohort lifetime. This resulted in an unfavorable impact to income for the three and nine months ended September 30, 2022

• Alignment of amortization of deferred acquisition costs to a constant level basis and modification of amortization periods to reflect the expected term of the related contracts could result in either higher or lower income for the affected product lines. This resulted in a net favorable impact to income for the three and nine months ended September 30, 2022.

• Accelerated recognition of the provision for adverse deviation or other differences from current best estimate values for policies issued prior to the transition date and due to not establishing the provision for policies issued on or after the transition date will generally result in higher income most notably in the initial years after the transition date. This resulted in a favorable impact to income for the three and nine months ended September 30, 2022.

• Establishing reserves for claims incurred on or after the transition date at interest rates prescribed by the update could result in either higher or lower income for the affected product lines depending on the policy issue date and the interest rate environment at that time. This resulted in a favorable impact to income for the three and nine months ended September 30, 2022.

• Updating cash flow assumptions could result in either higher or lower income. This resulted in a favorable impact to income for the three and nine months ended September 30, 2022.

• Accounting for non-contemporaneous reinsurance related to the second phase of our Closed Block individual disability reinsurance transaction which was completed in the first quarter of 2021. As a result of the execution of the second phase of the reinsurance transaction occurring after January 1, 2021, the transition date of ASU 2018-12, in accordance with the provisions of the ASU related to non-contemporaneous reinsurance, we were required to establish the ceded reserves using an upper-medium grade fixed-income instrument as of the reinsurance transaction date in March 2021 which resulted in higher ceded reserves compared to that which was reported historically. However, the direct reserves for the block reinsured in the second phase were calculated using the original discount rate utilized as of the transition date. Both the direct and ceded reserves are then remeasured at each reporting period using a current discount rate reflective of an upper-medium grade fixed-income instrument, with the changes recognized in OCI. While the total equity impact is neutral, the different original discount rates utilized for direct and ceded reserves result in disproportionate earnings impacts. The differential in the original discount rate applied to the direct and ceded cohorts of business resulted in an unfavorable impact to income for the three and nine months ended September 30, 2022, partially offset by a decrease in the amortization of the cost of reinsurance as a result of a lower cost of reinsurance.

Accounting Updates Outstanding:

ASU 2020-04, Reference Rate Reform (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial Reporting and related amendments

The amendments in this update provide optional guidance, for a limited period of time, to ease the potential burden in accounting for and recognizing the effects of reference rate reform on financial reporting. The guidance allows for various practical expedients and exceptions when applying GAAP to contracts, hedging relationships, and other transactions affected either by discontinued rates as a direct result of reference rate reform or a market-wide change in interest rates used for discounting, margining or contract price alignment, if certain criteria are met. Specifically, the guidance provides certain practical expedients for contract modifications, fair value hedges, and cash flow hedges, and also provides certain exceptions related to changes in the critical terms of a hedging relationship. The guidance also allows for a one-time election to sell or transfer debt securities that were both classified as held-to-maturity prior to January 1, 2020 and reference a rate affected by the reform.

The adoption of this update is permitted as of the beginning of the interim period that includes March 12, 2020 (the issuance date of the update), or any date thereafter, through December 31, 2024, at which point the guidance will sunset. We do not anticipate needing to adopt this guidance, but we will continue to monitor our contracts and hedging relationships throughout the adoption period.

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Fair Values of Financial Instruments

9 Months Ended

Sep. 30, 2023

Fair Value Disclosures [Abstract]

Fair Values of Financial Instruments

Fair Value of Financial Instruments

Fair Value Measurements for Financial Instruments Carried at Fair Value

We report fixed maturity securities, which are classified as available-for-sale securities, derivative financial instruments, and unrestricted equity securities at fair value in our consolidated balance sheets. We report our investments in private equity partnerships at our share of the partnerships' net asset value per share or its equivalent (NAV) as a practical expedient for fair value.

The degree of judgment utilized in measuring the fair value of financial instruments generally correlates to the level of pricing observability. Financial instruments with readily available active quoted prices or for which fair value can be measured from actively quoted prices in active markets generally have more pricing observability and less judgment utilized in measuring fair value. An active market for a financial instrument is a market in which transactions for an asset or a similar asset occur with sufficient frequency and volume to provide pricing information on an ongoing basis. A quoted price in an active market provides the most reliable evidence of fair value and should be used to measure fair value whenever available. Conversely, financial instruments rarely traded or not quoted have less observability and are measured at fair value using valuation techniques that require more judgment. Pricing observability is generally impacted by a number of factors, including the type of financial instrument, whether the financial instrument is new to the market and not yet established, the characteristics specific to the transaction, and overall market conditions.

We classify financial instruments in accordance with a fair value hierarchy consisting of three levels based on the observability of valuation inputs:

•Level 1 - the highest category of the fair value hierarchy classification wherein inputs are unadjusted and represent quoted prices in active markets for identical assets or liabilities at the measurement date.

•Level 2 - valued using inputs (other than prices included in Level 1) that are either directly or indirectly observable for the asset or liability through correlation with market data at the measurement date and for the duration of the instrument's anticipated life.

•Level 3 - the lowest category of the fair value hierarchy and reflects the judgment of management regarding what market participants would use in pricing assets or liabilities at the measurement date. Financial assets and liabilities categorized as Level 3 are generally those that are valued using unobservable inputs to extrapolate an estimated fair value.

Valuation Methodologies of Financial Instruments Measured at Fair Value

Valuation techniques used for assets and liabilities accounted for at fair value are generally categorized into three types. The market approach uses prices and other relevant information from market transactions involving identical or comparable assets or liabilities. The income approach converts future amounts, such as cash flows or earnings, to a single present amount, or a discounted amount. The cost approach is based upon the amount that currently would be required to replace the service capacity of an asset, or the current replacement cost.

We use valuation techniques that are appropriate in the circumstances and for which sufficient data are available that can be obtained without undue cost and effort. In some cases, a single valuation technique will be appropriate (for example, when valuing an asset or liability using quoted prices in an active market for identical assets or liabilities). In other cases, multiple valuation techniques will be appropriate. If we use multiple valuation techniques to measure fair value, we evaluate and weigh the results, as appropriate, considering the reasonableness of the range indicated by those results. A fair value measurement is the point within that range that is most representative of fair value in the circumstances.

The selection of the valuation method(s) to apply considers the definition of an exit price and depends on the nature of the asset or liability being valued. For assets and liabilities accounted for at fair value, we generally use valuation techniques consistent with the market approach, and to a lesser extent, the income approach. We believe the market approach provides more observable data than the income approach, considering the type of investments we hold. Our fair value measurements could differ significantly based on the valuation technique and available inputs. When using a pricing service, we obtain the vendor's pricing documentation to ensure we understand their methodologies. We periodically review and approve the selection of our pricing vendors to ensure we are in agreement with their current methodologies. When markets are less active, brokers may rely more on models with inputs based on the information available only to the broker. Our internal investment management professionals, which include portfolio managers and analysts, monitor securities priced by brokers and evaluate their prices for reasonableness based on benchmarking to available primary and secondary market information. In weighing a broker quote as an input to fair value, we place less reliance on quotes that do not reflect the result of market transactions. We also consider the nature of the quote, particularly whether it is a bid or market quote. If prices in an inactive market do not reflect current prices for the same or similar assets, adjustments may be necessary to arrive at fair value. When relevant market data is unavailable, which may be the case during periods of market uncertainty, the income approach can, in suitable circumstances, provide a more appropriate fair value. During 2023, we have applied valuation approaches and techniques on a consistent basis to similar assets and liabilities and consistent with those approaches and techniques used at year end 2022.

Fixed Maturity and Equity Securities

We use observable and unobservable inputs in measuring the fair value of our fixed maturity and equity securities. For securities categorized as Level 1, fair values equal active Trade Reporting and Compliance Engine (TRACE) pricing or unadjusted market maker prices. For securities categorized as Level 2 or Level 3, inputs that may be used in valuing each class of securities at any given time period are disclosed below. Actual inputs used to determine fair values will vary for each reporting period depending on the availability of inputs which may, at times, be affected by the lack of market liquidity.

		Level 2	Level 3
Instrument		Observable Inputs	Unobservable Inputs
United States Government and Government Agencies and Authorities
	Valuation Method	Principally the market approach	Not applicable
	Valuation Techniques / Inputs	Prices obtained from external pricing services

		Level 2	Level 3
Instrument		Observable Inputs	Unobservable Inputs
States, Municipalities, and Political Subdivisions
	Valuation Method	Principally the market approach	Principally the market approach
	Valuation Techniques / Inputs	Prices obtained from external pricing services	Analysis of similar bonds, adjusted for comparability
		Relevant reports issued by analysts and rating agencies
		Audited financial statements
Foreign Governments
	Valuation Method	Principally the market approach	Principally the market approach
	Valuation Techniques / Inputs	Prices obtained from external pricing services	Analysis of similar bonds, adjusted for comparability
		Non-binding broker quotes
		Call provisions
Public Utilities
	Valuation Method	Principally the market and income approaches	Principally the market and income approaches
	Valuation Techniques / Inputs	Prices obtained from external pricing services	Change in benchmark reference
		Non-binding broker quotes	Analysis of similar bonds, adjusted for comparability
		Benchmark yields	Discount for size - illiquidity
		Transactional data for new issuances and secondary trades	Volatility of credit
		Security cash flows and structures	Lack of marketability
		Recent issuance / supply
		Audited financial statements
		Security and issuer level spreads
		Security creditor ratings/maturity/capital structure/optionality
		Public covenants
		Comparative bond analysis
		Relevant reports issued by analysts and rating agencies

		Level 2	Level 3
Instrument		Observable Inputs	Unobservable Inputs
Mortgage/Asset-Backed Securities
	Valuation Method	Principally the market and income approaches	Principally the market approach
	Valuation Techniques / Inputs	Prices obtained from external pricing services	Analysis of similar bonds, adjusted for comparability
		Non-binding broker quotes	Prices obtained from external pricing services
		Security cash flows and structures
		Underlying collateral
		Prepayment speeds/loan performance/delinquencies
		Relevant reports issued by analysts and rating agencies
		Audited financial statements
All Other Corporate Bonds
	Valuation Method	Principally the market and income approaches	Principally the market and income approaches
	Valuation Techniques / Inputs	Prices obtained from external pricing services	Change in benchmark reference
		Non-binding broker quotes	Discount for size - illiquidity
		Benchmark yields	Volatility of credit
		Transactional data for new issuances and secondary trades	Lack of marketability
		Security cash flows and structures	Prices obtained from external pricing services
		Recent issuance / supply
		Security and issuer level spreads
		Security creditor ratings/maturity/capital structure/optionality
		Public covenants
		Comparative bond analysis
		Relevant reports issued by analysts and rating agencies
		Audited financial statements

		Level 2	Level 3
Instrument		Observable Inputs	Unobservable Inputs
Redeemable Preferred Stocks
	Valuation Method	Principally the market approach	Principally the market approach
	Valuation Techniques / Inputs	Non-binding broker quotes	Financial statement analysis
		Benchmark yields
		Comparative bond analysis
		Call provisions
		Relevant reports issued by analysts and rating agencies
		Audited financial statements
Perpetual Preferred and Equity Securities
	Valuation Method	Principally the market approach	Principally the market and income approaches
	Valuation Techniques / Inputs	Prices obtained from external pricing services	Financial statement analysis
		Non-binding broker quotes

The management of our investment portfolio includes establishing pricing policy and reviewing the reasonableness of sources and inputs used in developing pricing. We review all prices that vary between multiple pricing vendors by a threshold that is outside a normal market range for the asset type.  In the event we receive a vendor's market price that does not appear reasonable based on our market analysis, we may challenge the price and request further information about the assumptions and methodologies used by the vendor to price the security. We may change the vendor price based on a better data source such as an actual trade. We also review all prices that did not change from the prior month to ensure that these prices are within our expectations. The overall valuation process for determining fair values may include adjustments to valuations obtained from our pricing sources when they do not represent a valid exit price. These adjustments may be made when, in our judgment and considering our knowledge of the financial conditions and industry in which the issuer operates, certain features of the financial instrument require that an adjustment be made to the value originally obtained from our pricing sources. These features may include the complexity of the financial instrument, the market in which the financial instrument is traded, counterparty credit risk, credit structure, concentration, or liquidity. Additionally, an adjustment to the price derived from a model typically reflects our judgment of the inputs that other participants in the market for the financial instrument being measured at fair value would consider in pricing that same financial instrument. In the event an asset is sold, we test the validity of the fair value determined by our valuation techniques by comparing the selling price to the fair value determined for the asset in the immediately preceding month end reporting period.

Certain of our investments do not have readily determinable market prices and/or observable inputs or may at times be affected by the lack of market liquidity. For these securities, we use internally prepared valuations, including valuations based on estimates of future profitability, to estimate the fair value. Additionally, we may obtain prices from independent third-party brokers to aid in establishing valuations for certain of these securities. Key assumptions used by us to determine fair value for these securities include risk free interest rates, risk premiums, performance of underlying collateral (if any), and other factors involving significant assumptions which may or may not reflect those of an active market.

The parameters and inputs used to validate a price on a security may be adjusted for assumptions about risk and current market conditions on a quarter to quarter basis, as certain features may be more significant drivers of valuation at the time of pricing. Changes to inputs in valuations are not changes to valuation methodologies; rather, the inputs are modified to reflect direct or indirect impacts on asset classes from changes in market conditions.

At September 30, 2023, approximately 23.7 percent of our fixed maturity securities were valued using active trades from TRACE pricing or broker market maker prices for which there was current market activity in that specific security (comparable to receiving one binding quote).  The prices obtained were not adjusted, and the assets were classified as Level 1.

The remaining 76.3 percent of our fixed maturity securities were valued based on non-binding quotes or other observable and unobservable inputs, as discussed below:

•60.6 percent of our fixed maturity securities were valued based on prices from pricing services that generally use observable inputs such as prices for securities or comparable securities in active markets in their valuation techniques. These assets were classified as Level 2. 

•14.9 percent of our fixed maturity securities were valued based on one or more non-binding broker quotes, if validated by observable market data. When only one price is available, it is used if observable inputs and analysis confirms that it is appropriate. These assets, for which we were able to validate the price using other observable market data, were classified as Level 2.

•0.8 percent of our fixed maturity securities were valued based on prices of comparable securities, internal models, or pricing services or other non-binding quotes with no other observable market data. These assets were classified as either Level 2 or Level 3, with the categorization dependent on whether there was other observable market data.

Derivatives

Fair values for derivatives other than embedded derivatives in modified coinsurance arrangements are based on market quotes or pricing models and represent the net amount of cash we would have paid or received if the contracts had been settled or closed as of the last day of the period. Credit risk related to the counterparty and the Company is considered in determining the fair values of these derivatives. However, since we have collateralization agreements in place with each counterparty which limits our exposure, any credit risk is immaterial. Therefore, we determined that no adjustments for credit risk were required as of September 30, 2023 or December 31, 2022.

Fair values for our embedded derivative in a modified coinsurance arrangement are estimated using internal pricing models and represent the hypothetical value of the duration mismatch of assets and liabilities, interest rate risk, and third party credit risk embedded in the modified coinsurance arrangement.

We consider transactions in inactive markets to be less representative of fair value. We use all available observable inputs when measuring fair value, but when significant unobservable inputs are used, we classify these assets or liabilities as Level 3.

Private Equity Partnerships

Our private equity partnerships represent funds that are primarily invested in private credit, private equity, and real assets, as described below. Distributions received from the funds arise from income generated by the underlying investments as well as the liquidation of the underlying investments. There is generally not a public market for these investments.

The following tables present additional information about our private equity partnerships, including commitments for additional investments which may or may not be funded:

		September 30, 2023
Investment Category		Fair Value		Redemption Term / Redemption Notice	Unfunded Commitments
		(in millions of dollars)			(in millions of dollars)
Private Credit	(a)	$	238.0	Not redeemable	$	127.7
		48.7		Quarterly / 90 days notice	3.2
Total Private Credit		286.7			130.9
Private Equity	(b)	514.9		Not redeemable	420.2
		26.4		Initial 5.5 year lock on each new investment / Quarterly after 5.5 year lock with 90 days notice	17.6
Total Private Equity		541.3			437.8
Real Assets	(c)	420.3		Not redeemable	268.2
		32.6		Quarterly / 90 days notice	—
Total Real Assets		452.9			268.2
Total Partnerships		$	1,280.9		$	836.9

		December 31, 2022
Investment Category		Fair Value		Redemption Term / Redemption Notice	Unfunded Commitments
		(in millions of dollars)			(in millions of dollars)
Private Credit	(a)	$	239.3	Not redeemable	$	90.9
		35.7		Initial 2 year lock on each new investment / Quarterly after 2 year lock with 90 days notice	13.4
Total Private Credit		275.0			104.3
Private Equity	(b)	453.6		Not redeemable	377.2
		31.7		Initial 5.5 year lock on each new investment / Quarterly after 5.5 year lock with 90 days notice	39.1
Total Private Equity		485.3			416.3
Real Assets	(c)	373.9		Not redeemable	256.3
		60.1		Quarterly / 90 days notice	—
Total Real Assets		434.0			256.3
Total Partnerships		$	1,194.3		$	776.9

(a)Private Credit - The limited partnerships described in this category employ various investment strategies, generally providing direct lending or other forms of debt financing including first-lien, second-lien, mezzanine, and subordinated loans. The limited partnerships have credit exposure to corporates, physical assets, and/or financial assets within a variety of industries (including manufacturing, healthcare, energy, business services, technology, materials, and retail) in North America and, to a lesser extent, outside of North America.  As of September 30, 2023, the estimated remaining life of the investments that do not allow for redemptions is approximately 63 percent in the next 3 years, 26 percent during the period from 3 to 5 years, 9 percent during the period from 5 to 10 years, and 2 percent during the period from 10 to 15 years.

(b)Private Equity - The limited partnerships described in this category employ various strategies generally investing in controlling or minority control equity positions directly in companies and/or assets across various industries (including manufacturing, healthcare, energy, business services, technology, materials, and retail), primarily in private markets within North America and, to a lesser extent, outside of North America.  As of September 30, 2023, the estimated remaining life of the investments that do not allow for redemptions is approximately 37 percent in the next 3 years, 28 percent during the period from 3 to 5 years, 28 percent during the period from 5 to 10 years, and 7 percent during the period from 10 to 15 years.

(c)Real Assets - The limited partnerships described in this category employ various strategies, which include investing in the equity and/or debt financing of physical assets, including infrastructure (energy, power, water/wastewater, communications), transportation (including airports, ports, toll roads, aircraft, railcars) and real estate in North America, Europe, South America, and Asia.  As of September 30, 2023, the estimated remaining life of the investments that do not allow for redemptions is approximately 23 percent in the next 3 years, 33 percent during period from 3 to 5 years, 42 percent during the period from 5 to 10 years, and 2 percent during the period from 10 to 15 years.

We record changes in our share of net asset value of the partnerships in net investment income. We receive financial information related to our investments in partnerships and generally record investment income on a one-quarter lag in accordance with our accounting policy.

The following tables present information about financial instruments measured at fair value on a recurring basis by fair value level, based on the observability of the inputs used:

	September 30, 2023
	Level 1		Level 2		Level 3		NAV		Total
	(in millions of dollars)
Assets
Fixed Maturity Securities
United States Government and Government Agencies and Authorities	$	77.0	$	498.0	$	—	$	—	$	575.0
States, Municipalities, and Political Subdivisions	—		3,391.1		—		—		3,391.1
Foreign Governments	—		819.6		—		—		819.6
Public Utilities	650.6		4,310.6		—		—		4,961.2
Mortgage/Asset-Backed Securities	—		559.7		45.2		—		604.9
All Other Corporate Bonds	7,351.0		16,256.1		108.3		—		23,715.4
Redeemable Preferred Stocks	—		3.5		—		—		3.5
Total Fixed Maturity Securities	8,078.6		25,838.6		153.5		—		34,070.7
Other Long-term Investments
Derivatives
Forwards	—		5.0		—		—		5.0
Foreign Exchange Contracts	—		69.8		—		—		69.8
Embedded Derivative in Modified Coinsurance Arrangement	—		—		0.9		—		0.9
Total Derivatives	—		74.8		0.9		—		75.7
Perpetual Preferred and Equity Securities	—		10.4		17.5		—		27.9
Private Equity Partnerships	—		—		—		1,280.9		1,280.9
Total Other Long-term Investments	—		85.2		18.4		1,280.9		1,384.5
Total Financial Instrument Assets Carried at Fair Value	$	8,078.6	$	25,923.8	$	171.9	$	1,280.9	$	35,455.2
Liabilities
Other Liabilities
Derivatives
Forwards	$	—	$	184.1	$	—	$	—	$	184.1
Foreign Exchange Contracts	—		28.6		—		—		28.6
Total Derivatives	—		212.7		—		—		212.7
Total Financial Instrument Liabilities Carried at Fair Value	$	—	$	212.7	$	—	$	—	$	212.7

	December 31, 2022
	Level 1		Level 2		Level 3		NAV		Total
	(in millions of dollars)
Assets
Fixed Maturity Securities
United States Government and Government Agencies and Authorities	$	81.7	$	416.5	$	—	$	—	$	498.2
States, Municipalities, and Political Subdivisions	8.7		3,448.3		0.2		—		3,457.2
Foreign Governments	—		827.1		—		—		827.1
Public Utilities	160.1		4,796.8		—		—		4,956.9
Mortgage/Asset-Backed Securities	—		551.3		22.0		—		573.3
All Other Corporate Bonds	4,268.6		20,097.3		158.7		—		24,524.6
Redeemable Preferred Stocks	—		3.5		—		—		3.5
Total Fixed Maturity Securities	4,519.1		30,140.8		180.9		—		34,840.8
Other Long-term Investments
Derivatives
Forwards	—		5.6		—		—		5.6
Foreign Exchange Contracts	—		83.5		—		—		83.5
Total Derivatives	—		89.1		—		—		89.1
Perpetual Preferred and Equity Securities	—		9.6		16.2		—		25.8
Private Equity Partnerships	—		—		—		1,194.3		1,194.3
Total Other Long-term Investments	—		98.7		16.2		1,194.3		1,309.2
Total Financial Instrument Assets Carried at Fair Value	$	4,519.1	$	30,239.5	$	197.1	$	1,194.3	$	36,150.0
Liabilities
Other Liabilities
Derivatives
Forwards	$	—	$	48.5	$	—	$	—	$	48.5
Foreign Exchange Contracts	—		25.5		—		—		25.5
Embedded Derivative in Modified Coinsurance Arrangement	—		—		13.9		—		13.9
Total Derivatives	—		74.0		13.9		—		87.9
Total Financial Instrument Liabilities Carried at Fair Value	$	—	$	74.0	$	13.9	$	—	$	87.9

Changes in assets and liabilities measured at fair value on a recurring basis using significant unobservable inputs (Level 3) are as follows:

	Three Months Ended September 30, 2023
	Fair Value Beginning of Period		Total Realized and Unrealized Investment Gains (Losses) in								Level 3 Transfers				Fair Value End of Period		Change in Unrealized Gain (Loss) on Securities Held at the End of Period included in
			Earnings		OCI		Purchases		Sales/Maturities		Into		Out of				OCI		Earnings
	(in millions of dollars)
Fixed Maturity Securities
Public Utilities	$	—	$	(0.1)	$	0.1	$	—	$	(3.9)	$	3.9	$	—	$	—	$	—	$	—
Mortgage/Asset-Backed Securities	24.1		—		(1.4)		19.0		(1.0)		4.7		(0.2)		45.2		(1.4)		—
All Other Corporate Bonds	128.8		(4.6)		2.0		—		(54.9)		87.5		(50.5)		108.3		2.0		—
Total Fixed Maturity Securities	152.9		(4.7)		0.7		19.0		(59.8)		96.1		(50.7)		153.5		0.6		—
Perpetual Preferred and Equity Securities	17.5		—		—		—		—		—		—		17.5		—		—
Embedded Derivative in Modified Coinsurance Arrangement	(8.4)		9.3		—		—		—		—		—		0.9		—		9.3

	Three Months Ended September 30, 2022
	Fair Value Beginning of Period		Total Realized and Unrealized Investment Gains (Losses) in								Level 3 Transfers				Fair Value End of Period		Change in Unrealized Gain (Loss) on Securities Held at the End of Period included in
			Earnings		OCI		Purchases		Sales/Maturities		Into		Out of				OCI		Earnings
	(in millions of dollars)
Fixed Maturity Securities
States, Municipalities, and Political Subdivisions	$	—	$	—	$	(0.1)	$	—	$	—	$	0.3	$	—	$	0.2	$	(0.1)	$	—
Foreign Governments	20.2		—		(0.2)		—		—		—		—		20.0		(0.2)		—
Public Utilities	13.6		(0.4)		—		—		—		—		—		13.2		—		(0.4)
Mortgage/Asset-Backed Securities	11.6		—		0.6		—		(0.3)		0.2		(0.9)		11.2		0.6		—
All Other Corporate Bonds	103.5		—		(5.4)		1.3		(13.0)		57.9		(20.9)		123.4		(5.4)		—
Total Fixed Maturity Securities	148.9		(0.4)		(5.1)		1.3		(13.3)		58.4		(21.8)		168.0		(5.1)		(0.4)
Perpetual Preferred and Equity Securities	10.9		(0.1)		—		2.7		—		—		—		13.5		—		(0.1)
Embedded Derivative in Modified Coinsurance Arrangement	(34.3)		14.9		—		—		—		—		—		(19.4)		—		14.9

	Nine Months Ended September 30, 2023
	Fair Value Beginning of Year		Total Realized and Unrealized Investment Gains (Losses) in								Level 3 Transfers				Fair Value End of Period		Change in Unrealized Gain (Loss) on Securities Held at the End of Period included in
			Earnings		OCI		Purchases		Sales/Maturities		Into		Out of				OCI		Earnings
	(in millions of dollars)
Fixed Maturity Securities
States, Municipalities, and Political Subdivisions	$	0.2	$	—	$	—	$	—	$	—	$	—	$	(0.2)	$	—	$	—	$	—
Public Utilities	—		0.1		(0.1)		—		(7.2)		7.2		—		—		—		—
Mortgage/Asset-Backed Securities	22.0		—		(1.5)		29.9		(2.8)		6.6		(9.0)		45.2		(1.5)		—
All Other Corporate Bonds	158.7		(5.1)		(20.6)		1.5		(229.8)		276.0		(72.4)		108.3		(20.6)		—
Total Fixed Maturity Securities	180.9		(5.0)		(22.2)		31.4		(239.8)		289.8		(81.6)		153.5		(22.1)		—
Perpetual Preferred and Equity Securities	16.2		0.6		—		0.7		—		—		—		17.5		—		0.6
Embedded Derivative in Modified Coinsurance Arrangement	(13.9)		14.8		—		—		—		—		—		0.9		—		14.8

	Nine Months Ended September 30, 2022
	Fair Value Beginning of Year		Total Realized and Unrealized Investment Gains (Losses) in								Level 3 Transfers				Fair Value End of Period		Change in Unrealized Gain (Loss) on Securities Held at the End of Period included in
			Earnings		OCI		Purchases		Sales/Maturities		Into		Out of				OCI		Earnings
	(in millions of dollars)
Fixed Maturity Securities
States, Municipalities, and Political Subdivisions	$	13.4	$	—	$	(0.1)	$	0.3	$	—	$	—	$	(13.4)	$	0.2	$	(0.1)	$	—
Foreign Governments	20.8		—		(0.8)		—		—		—		—		20.0		(0.8)		—
Public Utilities	44.5		(4.6)		2.2		—		(10.8)		15.6		(33.7)		13.2		2.2		(4.6)
Mortgage/Asset-Backed Securities	187.2		—		(1.2)		9.9		(9.5)		—		(175.2)		11.2		(1.2)		—
All Other Corporate Bonds	861.5		—		(29.5)		8.8		(20.9)		18.3		(714.8)		123.4		(29.5)		—
Total Fixed Maturity Securities	1,127.4		(4.6)		(29.4)		19.0		(41.2)		33.9		(937.1)		168.0		(29.4)		(4.6)
Perpetual Preferred and Equity Securities	5.8		2.7		—		5.0		—		—		—		13.5		—		2.7
Embedded Derivative in Modified Coinsurance Arrangement	(30.1)		10.7		—		—		—		—		—		(19.4)		—		10.7

Realized and unrealized investment gains and losses presented in the preceding tables represent gains and losses only for the time during which the applicable financial instruments were classified as Level 3. The transfers between levels resulted primarily from a change in observability of three inputs used to determine fair values of the securities transferred: (1) transactional data for new issuance and secondary trades, (2) broker/dealer quotes and pricing, primarily related to changes in the level of activity in the market and whether the market was considered orderly, and (3) comparable bond metrics from which to perform an analysis. For fair value measurements of financial instruments that were transferred either into or out of Level 3, we reflect the transfers using the fair value at the beginning of the period. We believe this allows for greater transparency, as all changes in fair value that arise during the reporting period of the transfer are disclosed as a component of our Level 3 reconciliation.

The table below provides quantitative information regarding the significant unobservable inputs used in Level 3 fair value measurements derived from internal models. Unobservable inputs for fixed maturity securities are weighted by the fair value of the securities. Certain securities classified as Level 3 are excluded from the table below due to limitations in our ability to obtain the underlying inputs used by external pricing sources.

	September 30, 2023
	Fair Value		Valuation Method	Unobservable Input		Range/Weighted Average
	(in millions of dollars)
Fixed Maturity Securities
All Other Corporate Bonds - Private	$	16.2	Market Approach	Volatility of Credit Market Convention	(a) (b)	5.00% - 5.00% / 5.00% Priced at Par Value
Perpetual Preferred and Equity Securities	17.5		Market Approach	Market Convention	(b)	Priced at Cost, Owner's Equity, or Most Recent Round
Embedded Derivative in Modified Coinsurance Arrangement	0.9		Discounted Cash Flows	Projected Liability Cash Flows Weighted Spread of Swap Curve	(c)	Actuarial Assumptions 0.2%

	December 31, 2022
	Fair Value		Valuation Method	Unobservable Input		Range/Weighted Average
	(in millions of dollars)
Fixed Maturity Securities
All Other Corporate Bonds - Private	$	15.3	Market Approach	Volatility of Credit Market Convention	(a) (b)	5.41% - 5.41% / 5.41% Priced at Par Value
Perpetual Preferred and Equity Securities	16.2		Market Approach	Market Convention	(b)	Priced at Cost, Owner's Equity, or Most Recent Round
Embedded Derivative in Modified Coinsurance Arrangement	(13.9)		Discounted Cash Flows	Projected Liability Cash Flows Weighted Spread of Swap Curve	(c)	Actuarial Assumptions 0.6%

(a)Represents basis point adjustments for credit-specific factors

(b)Represents a decision to price based on par value, cost, owner's equity, or the price of the most recent capital funding round when limited data is available

(c)Represents various actuarial assumptions required to derive the liability cash flows. Fair value of embedded derivative is most often driven by the change in the weighted average credit spread to the swap curve for the assets backing the hypothetical loan

Other than market convention, the impact of isolated decreases in unobservable inputs will result in a higher estimated fair value, whereas isolated increases in unobservable inputs will result in a lower estimated fair value. The unobservable input for market convention is not sensitive to input movements. The projected liability cash flows used in the fair value measurement of our Level 3 embedded derivative are based on expected claim payments. If claim payments increase, the projected liability cash flows will increase, resulting in a decrease in the fair value of the embedded derivative. Decreases in projected liability cash flows will result in an increase in the fair value of the embedded derivative.

Fair Value Measurements for Financial Instruments Not Carried at Fair Value

The methods and assumptions used to estimate fair values of financial instruments not carried at fair value are discussed as follows:

Mortgage Loans: Fair value of newly originated, seasoned performing, or sub-performing but likely to continue cash flowing loans are calculated using a discounted cash flow analysis. Loans’ cash flows are modeled and appropriately discounted by a rate based on current yields and credit spreads. For sub and non-performing loans where there is some probability the loan will not continue to pay, a price based approach would be used to estimate the loan’s value in the open market utilizing current transaction information from similar loans.

Policy Loans: Fair values for policy loans, net of reinsurance ceded, are estimated using discounted cash flow analyses and interest rates currently being offered to policyholders with similar policies. Carrying amounts for ceded policy loans, which equal $3,229.7 million and $3,312.5 million as of September 30, 2023 and December 31, 2022, respectively, approximate fair value and are reported on a gross basis in our consolidated balance sheets. A change in interest rates for ceded policy loans will not impact our financial position because the benefits and risks are fully ceded to reinsuring counterparties.

Miscellaneous Long-term Investments: Carrying amounts for tax credit partnerships equal the unamortized balance of our contractual commitments and approximate fair value. Our shares of Federal Home Loan Bank (FHLB) common stock are carried at cost, which approximates fair value.

Long-term Debt: Fair values for long-term debt are obtained from independent pricing services or discounted cash flow analyses based on current incremental borrowing rates for similar types of borrowing arrangements.

FHLB Funding Agreements: Funding agreements with the FHLB represent cash advances used for the purpose of investing in fixed maturity securities. Carrying amounts approximate fair value.

Unfunded Commitments to Investment Partnerships: Unfunded equity commitments represent amounts that we have committed to fund certain investment partnerships. These commitments are legally binding, subject to the partnerships meeting specified conditions. Carrying amounts of these financial instruments approximate fair value.

The following table presents the carrying amounts and estimated fair values of our financial instruments not measured at fair value and indicates the level in the fair value hierarchy of the estimated fair value measurement based on the observability of the inputs used:

	September 30, 2023
	Estimated Fair Value
	Level 1		Level 2		Level 3		Total		Carrying Value
	(in millions of dollars)
Assets
Mortgage Loans	$	—	$	1,984.5	$	—	$	1,984.5	$	2,321.5
Policy Loans	—		—		3,654.0		3,654.0		3,596.6
Other Long-term Investments
Miscellaneous Long-term Investments	—		16.3		0.5		16.8		16.8
Total Financial Instrument Assets Not Carried at Fair Value	$	—	$	2,000.8	$	3,654.5	$	5,655.3	$	5,934.9
Liabilities
Long-term Debt	$	2,593.2	$	390.5	$	—	$	2,983.7	$	3,429.8
Other Liabilities
Unfunded Commitments	—		0.2		—		0.2		0.2
Payable for Collateral on FHLB Funding Agreements	—		76.9		—		76.9		76.9
Total Financial Instrument Liabilities Not Carried at Fair Value	$	2,593.2	$	467.6	$	—	$	3,060.8	$	3,506.9

	December 31, 2022
	Estimated Fair Value
	Level 1		Level 2		Level 3		Total		Carrying Value
	(in millions of dollars)
Assets
Mortgage Loans	$	—	$	2,159.5	$	—	$	2,159.5	$	2,435.4
Policy Loans	—		—		3,677.0		3,677.0		3,601.2
Other Long-term Investments
Miscellaneous Long-term Investments	—		17.1		1.3		18.4		18.4
Total Financial Instrument Assets Not Carried at Fair Value	$	—	$	2,176.6	$	3,678.3	$	5,854.9	$	6,055.0
Liabilities
Long-term Debt	$	2,288.9	$	783.1	$	—	$	3,072.0	$	3,427.8
Other Liabilities
Unfunded Commitments	—		0.7		—		0.7		0.7
Payable for Collateral on FHLB Funding Agreements	—		99.1		—		99.1		99.1
Total Financial Instrument Liabilities Not Carried at Fair Value	$	2,288.9	$	882.9	$	—	$	3,171.8	$	3,527.6

The carrying values of financial instruments such as short-term investments, cash and bank deposits, accounts and premiums receivable, accrued investment income, securities lending agreements, and short-term debt approximate fair value due to the short-term nature of the instruments. As such, these financial instruments are not included in the above chart.

Fair values for insurance contracts other than investment contracts are not required to be disclosed. However, the fair values of liabilities under all insurance contracts are taken into consideration in our overall management of interest rate risk, which seeks to minimize exposure to changing interest rates through the matching of investment maturities with amounts due under insurance contracts.

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Investments

9 Months Ended

Sep. 30, 2023

Investments, Debt and Equity Securities [Abstract]

Investments

Fixed Maturity Securities

At September 30, 2023 and December 31, 2022, all fixed maturity securities were classified as available-for-sale. The amortized cost and fair values of securities by security type are shown as follows:

	September 30, 2023
	Amortized Cost, Gross of ACL1		ACL1		Gross Unrealized Gain		Gross Unrealized Loss		Fair Value
	(in millions of dollars)
United States Government and Government Agencies and Authorities	$	605.2	$	—	$	7.9	$	38.1	$	575.0
States, Municipalities, and Political Subdivisions	4,066.9		—		49.8		725.6		3,391.1
Foreign Governments	945.7		—		12.8		138.9		819.6
Public Utilities	5,410.5		—		67.7		517.0		4,961.2
Mortgage/Asset-Backed Securities	655.0		—		4.1		54.2		604.9
All Other Corporate Bonds	26,537.0		—		282.4		3,104.0		23,715.4
Redeemable Preferred Stocks	4.0		—		—		0.5		3.5
Total Fixed Maturity Securities	$	38,224.3	$	—	$	424.7	$	4,578.3	$	34,070.7

	December 31, 2022
	Amortized Cost, Gross of ACL1		ACL1		Gross Unrealized Gain		Gross Unrealized Loss		Fair Value
	(in millions of dollars)
United States Government and Government Agencies and Authorities	$	503.8	$	—	$	20.3	$	25.9	$	498.2
States, Municipalities, and Political Subdivisions	4,006.0		—		87.1		635.9		3,457.2
Foreign Governments	908.1		—		34.9		115.9		827.1
Public Utilities	5,170.9		—		141.0		355.0		4,956.9
Mortgage/Asset-Backed Securities	592.1		—		8.2		27.0		573.3
All Other Corporate Bonds	26,640.3		—		452.1		2,567.8		24,524.6
Redeemable Preferred Stocks	4.0		—		—		0.5		3.5
Total Fixed Maturity Securities	$	37,825.2	$	—	$	743.6	$	3,728.0	$	34,840.8

1 Allowance for Credit Losses

The following charts indicate the length of time our fixed maturity securities have been in a gross unrealized loss position.

	September 30, 2023
	Less Than 12 Months				12 Months or Greater
	Fair Value		Gross Unrealized Loss		Fair Value		Gross Unrealized Loss
	(in millions of dollars)
United States Government and Government Agencies and Authorities	$	245.5	$	8.8	$	186.2	$	29.3
States, Municipalities, and Political Subdivisions	670.3		35.5		1,851.7		690.1
Foreign Governments	152.4		30.8		224.2		108.1
Public Utilities	1,914.7		105.6		1,611.2		411.4
Mortgage/Asset-Backed Securities	189.8		13.2		301.0		41.0
All Other Corporate Bonds	5,012.4		327.8		13,492.9		2,776.2
Redeemable Preferred Stocks	—		—		3.5		0.5
Total Fixed Maturity Securities	$	8,185.1	$	521.7	$	17,670.7	$	4,056.6

	December 31, 2022
	Less Than 12 Months				12 Months or Greater
	Fair Value		Gross Unrealized Loss		Fair Value		Gross Unrealized Loss
	(in millions of dollars)
United States Government and Government Agencies and Authorities	$	246.6	$	22.6	$	12.2	$	3.3
States, Municipalities, and Political Subdivisions	1,920.1		476.1		346.6		159.8
Foreign Governments	160.1		47.9		176.9		68.0
Public Utilities	2,242.2		252.0		255.2		103.0
Mortgage/Asset-Backed Securities	386.6		27.0		0.1		—
All Other Corporate Bonds	15,865.6		1,799.7		2,194.1		768.1
Redeemable Preferred Stocks	3.5		0.5		—		—
Total Fixed Maturity Securities	$	20,824.7	$	2,625.8	$	2,985.1	$	1,102.2

The following is a distribution of the maturity dates for fixed maturity securities. The maturity dates have not been adjusted for possible calls or prepayments.

	September 30, 2023
	Amortized Cost, Net of ACL1		Unrealized Gain Position				Unrealized Loss Position
			Gross Gain		Fair Value		Gross Loss		Fair Value
	(in millions of dollars)
1 year or less	$	945.9	$	1.3	$	352.8	$	5.0	$	589.4
Over 1 year through 5 years	7,541.9		67.7		1,988.1		311.5		5,310.0
Over 5 years through 10 years	9,393.8		187.5		2,879.0		955.4		5,746.9
Over 10 years	19,687.7		164.1		2,880.9		3,252.2		13,718.7
	37,569.3		420.6		8,100.8		4,524.1		25,365.0
Mortgage/Asset-Backed Securities	655.0		4.1		114.1		54.2		490.8
Total Fixed Maturity Securities	$	38,224.3	$	424.7	$	8,214.9	$	4,578.3	$	25,855.8

	December 31, 2022
	Amortized Cost, Net of ACL1		Unrealized Gain Position				Unrealized Loss Position
			Gross Gain		Fair Value		Gross Loss		Fair Value
	(in millions of dollars)
1 year or less	$	1,133.5	$	2.9	$	339.1	$	5.7	$	791.6
Over 1 year through 5 years	7,090.8		86.7		1,953.2		238.4		4,985.9
Over 5 years through 10 years	10,096.7		294.8		3,538.9		863.8		5,988.8
Over 10 years	18,912.1		351.0		5,013.2		2,593.1		11,656.8
	37,233.1		735.4		10,844.4		3,701.0		23,423.1
Mortgage/Asset-Backed Securities	592.1		8.2		186.6		27.0		386.7
Total Fixed Maturity Securities	$	37,825.2	$	743.6	$	11,031.0	$	3,728.0	$	23,809.8

1 Allowance for Credit Losses

The following chart depicts an analysis of our fixed maturity security portfolio between investment-grade and below-investment-grade categories as of September 30, 2023:

					Gross Unrealized Loss
	Fair Value		Gross Unrealized Gain		Amount		Percent of Total Gross Unrealized Loss
	(in millions of dollars)
Investment-Grade	$	32,659.4	$	420.6	$	4,404.0	96.2	%
Below-Investment-Grade	1,411.3		4.1		174.3		3.8
Total Fixed Maturity Securities	$	34,070.7	$	424.7	$	4,578.3	100.0	%

The unrealized losses on investment-grade fixed maturity securities principally relate to changes in interest rates or changes in market or sector credit spreads which occurred subsequent to the acquisition of the securities. Below-investment-grade fixed maturity securities are generally more likely to develop credit concerns than investment-grade securities. At September 30, 2023, the unrealized losses in our below-investment-grade fixed maturity securities were generally due to credit spreads in certain industries or sectors and, to a lesser extent, credit concerns related to specific securities. For each specific security in an unrealized loss position, we believe that there are positive factors which mitigate credit concerns and that the securities for which we have not recorded a credit loss will recover in value. We have the ability and intent to continue to hold these securities to recovery of amortized cost and believe that no credit losses have occurred.

As of September 30, 2023, we held 968 individual investment-grade fixed maturity securities and 93 individual below-investment-grade fixed maturity securities that were in an unrealized loss position, of which 813 investment-grade fixed maturity securities and 79 below-investment-grade fixed maturity securities had been in an unrealized loss position continuously for over one year.

In determining when a decline in fair value below amortized cost of a fixed maturity security represents a credit loss, we evaluate the following factors:

•Whether we expect to recover the entire amortized cost basis of the security

•Whether we intend to sell the security or will be required to sell the security before the recovery of its amortized cost basis

•Whether the security is current as to principal and interest payments

•The significance of the decline in value

•Current and future business prospects and trends of earnings

•The valuation of the security's underlying collateral

•Relevant industry conditions and trends relative to their historical cycles

•Market conditions

•Rating agency and governmental actions

•Bid and offering prices and the level of trading activity

•Adverse changes in estimated cash flows for securitized investments

•Changes in fair value subsequent to the balance sheet date

•Any other key measures for the related security

While determining whether a credit loss exists is a judgmental area, we utilize a formal, well-defined, and disciplined process to monitor and evaluate our fixed income investment portfolio, supported by issuer specific research and documentation as of the end of each period. The process results in a thorough evaluation of investments and the recording of credit losses on a timely basis for investments determined to have a credit loss. We calculate the allowance for credit losses of fixed maturity securities based on the present value of our best estimate of cash flows expected to be collected, discounted using the effective interest rate implicit in the security at the date of acquisition. When estimating future cash flows, we analyze the strength of the issuer’s balance sheet, its debt obligations and near-term funding arrangements, cash flow and liquidity, the profitability of its core businesses, the availability of marketable assets which could be sold to increase liquidity, its industry fundamentals and regulatory environment, and its access to capital markets.

The following tables present a rollforward of the allowance for credit losses on available-for-sale fixed maturity securities, which were classified as "public utilities" during the three and nine months ended September 30, 2022.

	Three Months Ended September 30
	2023		2022
	(in millions of dollars)
Balance, beginning of period	$	—	$	4.1
Change in allowance on securities with allowance recorded in previous period	—		0.5
Balance, end of period	$	—	$	4.6

	Nine Months Ended September 30
	2023		2022
	(in millions of dollars)
Balance, beginning of period	$	—	$	—
Credit losses on securities for which credit losses were not previously recorded	—		4.6
Balance, end of period	$	—	$	4.6

At September 30, 2023, we had commitments of $53.8 million to fund private placement fixed maturity securities, the amount of which may or may not be funded. 

Variable Interest Entities

We invest in variable interests issued by variable interest entities. These investments, which are passive in nature, include minority ownership interests in private equity partnerships, tax credit partnerships, and special purpose entities. For those variable interests that are not consolidated in our financial statements, we are not the primary beneficiary because we have neither the power to direct the activities that are most significant to economic performance nor the responsibility to absorb a majority of the expected losses. The determination of whether we are the primary beneficiary is performed at the time of our initial investment and at the date of each subsequent reporting period.

As of September 30, 2023, the carrying amount of our variable interest entity investments that are not consolidated in our financial statements was $1,281.4 million, comprised of $0.5 million of tax credit partnerships and $1,280.9 million of private equity partnerships. At December 31, 2022, the carrying amount of our variable interest entity investments that are not consolidated in our financial statements was $1,195.3 million, comprised of $1.0 million of tax credit partnerships and $1,194.3 million of private equity partnerships.  These variable interest entity investments are reported as other long-term investments in our consolidated balance sheets.

Mortgage Loans

Our mortgage loan portfolio is well diversified by both geographic region and property type to reduce risk of concentration. All of our mortgage loans are collateralized by commercial real estate. When issuing a new loan, our general policy is not to exceed a loan-to-value ratio, or the ratio of the loan balance to the estimated fair value of the underlying collateral, of 75 percent. We update the loan-to-value ratios based on internal valuation of the collateral at least every three years for each loan, and properties undergo a general inspection at least every two years. Our general policy for newly issued loans is to have a debt service coverage ratio greater than 1.25 times on a normalized 25 year amortization period. We update our debt service coverage ratios annually.

We carry our mortgage loans at amortized cost less an allowance for expected credit losses. The amortized cost of our mortgage loans was $2,331.7 million and $2,444.7 million at September 30, 2023 and December 31, 2022, respectively. The allowance for expected credit losses was $10.2 million and $9.3 million at September 30, 2023 and December 31, 2022, respectively. Interest income is accrued on the principal amount of the loan based on the loan's contractual interest rate. We

report accrued interest income for our mortgage loans as accrued investment income on our consolidated balance sheets, and the amount of the accrued income was $7.2 million and $7.7 million at September 30, 2023 and December 31, 2022, respectively.

The carrying amount of mortgage loans by property type and geographic region are presented below.

	September 30, 2023				December 31, 2022
	(in millions of dollars)
	Carrying Amount		Percent of Total		Carrying Amount		Percent of Total
Property Type
Apartment	$	674.8	29.1	%	$	688.6	28.3	%
Industrial	715.5		30.8		745.3		30.6
Office	384.1		16.5		423.0		17.4
Retail	504.1		21.7		534.5		21.9
Other	43.0		1.9		44.0		1.8
Total	$	2,321.5	100.0	%	$	2,435.4	100.0	%
Region
New England	$	55.7	2.4	%	$	52.4	2.2	%
Mid-Atlantic	156.8		6.8		192.4		7.9
East North Central	300.2		12.9		313.0		12.9
West North Central	171.2		7.4		181.4		7.4
South Atlantic	553.6		23.8		539.3		22.1
East South Central	98.8		4.3		101.8		4.2
West South Central	202.7		8.7		212.6		8.7
Mountain	284.8		12.3		298.7		12.3
Pacific	497.7		21.4		543.8		22.3
Total	$	2,321.5	100.0	%	$	2,435.4	100.0	%

The risk in our mortgage loan portfolio is primarily related to vacancy rates. Events or developments, such as economic conditions that impact the ability of the borrowers to ensure occupancy of the property, may have a negative effect on our mortgage loan portfolio, particularly to the extent that our portfolio is concentrated in an affected region or property type. An increase in vacancies increases the probability of default, which would negatively affect our expected losses in our mortgage loan portfolio.

We evaluate each of our mortgage loans individually for impairment and assign an internal quality rating based on a comprehensive rating system used to evaluate the risk of the loan. The factors we use to derive our internal quality ratings may include the following:

•Loan-to-value ratio based on internal valuation of property

•Debt service coverage ratio based on current operating income

•Property location, including regional economics, trends and demographics

•Age, condition, and construction quality of property

•Current and historical occupancy of property

•Lease terms relative to market

•Tenant size and financial strength

•Borrower's financial strength

•Borrower's equity in transaction

•Additional collateral, if any

Although all available and applicable factors are considered in our analysis, loan-to-value and debt service coverage ratios are the most critical factors in determining whether we will initially issue the loan and also in assigning values and determining

impairment. We assign an overall rating to each loan using an internal rating scale of AA (highest quality) to B (lowest quality). We review and adjust, as needed, our internal quality ratings on an annual basis. This review process is performed more frequently for mortgage loans deemed to have a higher risk of delinquency.

We estimate an allowance for credit losses that we expect to incur over the life of our mortgage loans using a probability of default method. For each loan, we estimate the probability that the loan will default before its maturity (probability of default) and the amount of the loss if the loan defaults (loss given default). These two factors result in an expected loss percentage that is applied to the amortized cost of each loan to determine the expected credit loss. As we are the original underwriter of the mortgage loans, the amortized cost generally equals the principal amount of the loan. We measure losses on defaults of our mortgage loans as the excess amortized cost of the mortgage loan over the fair value of the underlying collateral in the event that we foreclose on the loan or over the expected future cash flows of the loan if we retain the mortgage loan until payoff. We do not purchase mortgage loans with existing credit impairments.

In estimating the probability of default, we consider historical experience, current market conditions, and reasonable and supportable forecasts about the future market conditions. We utilize our historical loan experience in combination with a large third-party industry database for a period of time that aligns with the average life of our loans based on the maturity dates of the loans and prepayment experience. Our model utilizes an industry database of the historical loss experience based on our actual portfolio characteristics such as loan-to-value, debt service coverage, collateral type, geography, and late payment history. In addition, because we actively manage our portfolio, we may extend the term of a loan in certain situations and will accordingly extend the maturity date in the estimate of probability of default. In estimating the loss given default, we primarily consider the type and value of collateral and secondarily the expected liquidation costs and time to recovery.

The primary market factors that we consider in our forecast of future market conditions are gross domestic product, unemployment rates, interest rates, inflation, commercial real estate values, household formation, and retail sales. We also forecast certain loan specific factors such as growth in the fair value and net operating income of collateral by property type. We include our estimate of these factors over a two-year period and for the remainder of the loans’ estimated lives, adjusted for estimated prepayments. Past the two-year forecast period, we revert to the historical assumptions ratably by the end of the fifth year of the loan after which we utilize only historical assumptions.

We utilize various scenarios to estimate our allowance for expected losses ranging from a base case scenario that reflects normal market conditions to a severe case scenario that reflects adverse market conditions. We will adjust our allowance each period to utilize the scenario or weighting of the scenarios that best reflects our view of current market conditions.

The following tables present information about mortgage loans by the applicable internal quality indicators:

	September 30, 2023				December 31, 2022
	(in millions of dollars)
	Carrying Amount		Percent of Total		Carrying Amount		Percent of Total
Internal Mortgage Rating
AA	$	85.9	3.7	%	$	92.3	3.8	%
A	885.4		38.1		843.9		34.6
BBB	1,309.1		56.4		1,458.0		59.9
BB	41.1		1.8		41.2		1.7
Total	$	2,321.5	100.0	%	$	2,435.4	100.0	%
Loan-to-Value Ratio1
<= 65%	$	1,351.8	58.3	%	$	1,389.6	57.0	%
> 65% <= 75%	762.4		32.8		937.2		38.5
> 75% <= 85%	137.9		5.9		75.0		3.1
> 85%	69.4		3.0		33.6		1.4
Total	$	2,321.5	100.0	%	$	2,435.4	100.0	%

1Loan-to-Value Ratio utilizes the most recent internal valuation of the property

There were no gross write-offs for the periods ending September 30, 2023 or December 31, 2022. The following tables present the amortized cost of our mortgage loans by year of origination and internal quality indicators at September 30, 2023 and December 31, 2022, respectively:

	September 30, 2023
	Prior to 2019		2019		2020		2021		2022		2023		Total
	(in millions of dollars)
Internal Mortgage Rating
AA	$	75.0	$	11.0	$	—	$	—	$	—	$	—	$	86.0
A	585.1		101.0		71.3		90.9		23.4		15.5		887.2
BBB	657.6		226.3		95.3		259.4		64.5		13.0		1,316.1
BB	42.4		—		—		—		—		—		42.4
Total Amortized Cost	1,360.1		338.3		166.6		350.3		87.9		28.5		2,331.7
Allowance for credit losses	(6.6)		(1.3)		(0.6)		(1.0)		(0.6)		(0.1)		(10.2)
Carrying Amount	$	1,353.5	$	337.0	$	166.0	$	349.3	$	87.3	$	28.4	$	2,321.5
Loan-to-Value Ratio1
<=65%	$	882.6	$	199.0	$	110.8	$	146.2	$	16.4	$	—	$	1,355.0
>65<=75%	308.1		139.3		47.5		172.0		71.5		28.5		766.9
>75%<=85%	98.3		—		8.3		32.1		—		—		138.7
>85%	71.1		—		—		—		—		—		71.1
Total Amortized Cost	1,360.1		338.3		166.6		350.3		87.9		28.5		2,331.7
Allowance for credit losses	(6.6)		(1.3)		(0.6)		(1.0)		(0.6)		(0.1)		(10.2)
Carrying Amount	$	1,353.5	$	337.0	$	166.0	$	349.3	$	87.3	$	28.4	$	2,321.5

1Loan-to-Value Ratio utilizes the most recent internal valuation of the property

	December 31, 2022
	Prior to 2018		2018		2019		2020		2021		2022		Total
	(in millions of dollars)
Internal Mortgage Rating
AA	$	53.8	$	27.5	$	11.1	$	—	$	—	$	—	$	92.4
A	485.0		123.3		96.8		35.9		80.6		24.0		845.6
BBB	534.0		219.8		236.9		134.0		275.8		64.6		1,465.1
BB	35.7		5.9		—		—		—		—		41.6
Total Amortized Cost	1,108.5		376.5		344.8		169.9		356.4		88.6		2,444.7
Allowance for credit losses	(4.3)		(1.8)		(1.3)		(0.6)		(0.8)		(0.5)		(9.3)
Carrying Amount	$	1,104.2	$	374.7	$	343.5	$	169.3	$	355.6	$	88.1	$	2,435.4
Loan-to-Value Ratio1
<=65%	$	782.6	$	189.0	$	193.9	$	81.3	$	128.9	$	16.9	$	1,392.6
>65<=75%	230.2		181.6		150.9		80.1		227.5		71.7		942.0
>75%<=85%	67.5		—		—		8.5		—		—		76.0
>85%	28.2		5.9		—		—		—		—		34.1
Total Amortized Cost	1,108.5		376.5		344.8		169.9		356.4		88.6		2,444.7
Allowance for credit losses	(4.3)		(1.8)		(1.3)		(0.6)		(0.8)		(0.5)		(9.3)
Carrying Amount	$	1,104.2	$	374.7	$	343.5	$	169.3	$	355.6	$	88.1	$	2,435.4

1Loan-to-Value Ratio utilizes the most recent internal valuation of the property

The following table presents a roll-forward of the allowance for expected credit losses by loan-to-value ratio for the three and nine months ended September 30, 2023 and 2022:

	Three Months Ended September 30, 2023
	Beginning of Period		Current Period Provisions		Write-Offs		Recoveries		End of Period
	(in millions of dollars)
Loan-to-Value Ratio1
<=65%	$	3.3	$	(0.1)	$	—	$	—	$	3.2
>65<=75%	4.8		(0.4)		—		—		4.4
>75%<=85%	0.9		—		—		—		0.9
>85%	2.1		(0.4)		—		—		1.7
Total	$	11.1	$	(0.9)	$	—	$	—	$	10.2

	Three Months Ended September 30, 2022
	Beginning of Period		Current Period Provisions		Write-Offs		Recoveries		End of Period
	(in millions of dollars)
Loan-to-Value Ratio1
<=65%	$	2.3	$	0.2	$	—	$	—	$	2.5
>65<=75%	4.8		0.4		—		—		5.2
>75%<=85%	0.9		(0.2)		—		—		0.7
>85%	0.4		(0.1)		—		—		0.3
Total	$	8.4	$	0.3	$	—	$	—	$	8.7

	Nine Months Ended September 30, 2023
	Beginning of Year		Current Period Provisions		Write-Offs		Recoveries		End of Period
	(in millions of dollars)
Loan-to-Value Ratio1
<=65%	$	3.0	$	0.2	$	—	$	—	$	3.2
>65<=75%	4.7		(0.3)		—		—		4.4
>75%<=85%	1.1		(0.2)		—		—		0.9
>85%	0.5		1.2		—		—		1.7
Total	$	9.3	$	0.9	$	—	$	—	$	10.2

	Nine Months Ended September 30, 2022
	Beginning of Year		Current Period Provisions		Write-Offs		Recoveries		End of Period
	(in millions of dollars)
Loan-to-Value Ratio1
<=65%	$	2.6	$	(0.1)	$	—	$	—	$	2.5
>65<=75%	4.7		0.5		—		—		5.2
>75%<=85%	0.7		—		—		—		0.7
>85%	0.3		—		—		—		0.3
Total	$	8.3	$	0.4	$	—	$	—	$	8.7

1Loan-to-Value Ratio utilizes the most recent internal valuation of the property

For the three and nine months ended September 30, 2023, our estimate for expected credit losses was generally consistent between periods.

For the three and nine months ended September 30, 2023, we granted an other-than-insignificant payment delay for a commercial mortgage loan with an amortized cost of $14.2 million, which deferred the principal payment for 18 months. This modification represents less than one percent of the commercial mortgage loan portfolio balance.

At September 30, 2023 and December 31, 2022, we held no mortgage loans that were greater than 90 days past due regarding principal and/or interest payments.

We had no loan foreclosures for the three and nine months ended September 30, 2023 or 2022.

Other than our allowance for expected credit losses, we had no specifically identified impaired mortgage loans during the three and nine months ended September 30, 2023 or 2022, nor did we recognize any interest income on mortgage loans subsequent to impairment.

At September 30, 2023, we had commitments of $8.8 million to fund certain commercial mortgage loans. Consistent with how we determine the estimate of current expected credit losses for our funded mortgage loans each period, we estimate expected credit losses for loans that have not been funded but we are committed to fund at the end of each period. At September 30, 2023 and December 31, 2022, we had $0.1 million and a nominal amount, respectively, of expected credit losses related to unfunded commitments on our consolidated balance sheets.

Investment Real Estate

Our investment real estate balance was $65.7 million and $71.6 million at September 30, 2023 and December 31, 2022, respectively, and the associated accumulated depreciation was $126.0 million and $122.1 million at September 30, 2023 and December 31, 2022, respectively. For the three and nine months ended September 30, 2023, we recognized a $3.0 million impairment related to certain of our real estate held for investment. We did not recognize any impairments related to our real estate during the three and nine months ended September 30, 2022.

Our held for sale real estate balance was $40.9 million at both September 30, 2023 and December 31, 2022 and the associated accumulated depreciation was $54.2 million at both September 30, 2023 and December 31, 2022.

In the first quarter of 2022, we reclassified property previously held for the production of income to property held for sale. The carrying value of the property was $40.1 million as of both September 30, 2023 and December 31, 2022 and is primarily recorded within our Corporate segment. The estimated fair value less costs to sell is above the carrying value of the property and we expect to close the sale of the property within the next twelve months.

During the third quarter of 2022, we reclassified one additional property previously held for the production of income to property held for sale. The property had a carrying value of $0.8 million as of both September 30, 2023 and December 31, 2022 and is primarily recorded within our Corporate segment. The estimated fair value less cost to sell is above the carrying value and we expect to close the sale within the next twelve months.

Transfers of Financial Assets

To manage our cash position more efficiently, we may enter into repurchase agreements with unaffiliated financial institutions. We generally use repurchase agreements as a means to finance the purchase of invested assets or for short-term general business purposes until projected cash flows become available from our operations or existing investments. Our repurchase agreements are typically outstanding for less than 30 days. We post collateral through our repurchase agreement transactions whereby the counterparty commits to purchase securities with the agreement to resell them to us at a later, specified date. The fair value of collateral posted is generally 102 percent of the cash received.

Our investment policy also permits us to lend fixed maturity securities to unaffiliated financial institutions in short-term securities lending agreements. These agreements increase our investment income with minimal risk. Our securities lending

policy requires that a minimum of 102 percent of the fair value of the securities loaned be maintained as collateral. We may receive cash and/or securities as collateral under these agreements. Cash received as collateral is typically reinvested in short-term investments. If securities are received as collateral, we are not permitted to sell or re-post them.

As of September 30, 2023, the carrying amount of fixed maturity securities loaned to third parties under our securities lending program was $68.3 million, for which we received collateral in the form of cash and securities of $59.6 million and $12.3 million, respectively. As of December 31, 2022, the carrying amount of fixed maturity securities loaned to third parties under our securities lending program was $152.4 million, for which we received collateral in the form of cash and securities of $88.5 million and $69.8 million, respectively. We had no outstanding repurchase agreements at September 30, 2023 or December 31, 2022. The remaining contractual maturities of our securities lending agreements disaggregated by class of assets pledged are as follows:

	September 30, 2023		December 31, 2022
	Overnight and Continuous
	(in millions of dollars)
Borrowings
United States Government and Government Agencies and Authorities	$	—	$	0.3
States, Municipalities, and Political Subdivisions	—		—
Public Utilities	2.2		6.3
All Other Corporate Bonds	57.4		81.9
Total Borrowings	$	59.6	$	88.5
Gross Amount of Recognized Liability for Securities Lending Transactions	59.6		88.5
Amounts Related to Agreements Not Included in Offsetting Disclosure Contained Herein	$	—	$	—

Certain of our U.S. insurance subsidiaries are members of regional FHLBs. Membership, which requires that we purchase a minimum amount of FHLB common stock on which we receive dividends, provides access to low-cost funding. Advances received from the FHLB are used for the purchase of fixed maturity securities. Additional common stock purchases may be required, based on the amount of funds we borrow from the FHLBs. The carrying value of common stock owned, collateral posted, and advances received are as follows:

	September 30, 2023		December 31, 2022
	(in millions of dollars)
Carrying Value of FHLB Common Stock	$	16.3	$	17.1
Advances from FHLB	76.9		99.1
Carrying Value of Collateral Posted to FHLB
Fixed Maturity Securities	$	536.4	$	527.1
Commercial Mortgage Loans	756.8		801.9
Total Carrying Value of Collateral Posted to FHLB	$	1,293.2	$	1,329.0

Offsetting of Financial Instruments

We enter into master netting agreements with each of our derivative's counterparties. These agreements provide for conditional rights of set-off upon the occurrence of an early termination event. An early termination event is considered a default, and it allows the non-defaulting party to offset its contracts in a loss position against any gain positions or payments due to the defaulting party. Under our agreements, default type events are defined as failure to pay or deliver as contractually agreed, misrepresentation, bankruptcy, or merger without assumption. See Note 5 for further discussion of collateral related to our derivative contracts.

We have securities lending agreements with unaffiliated financial institutions that post collateral to us in return for the use of our fixed maturity securities. A right of set-off exists that allows us to keep and apply collateral received in the event of default by the counterparty. Default within a securities lending agreement would typically occur if the counterparty failed to return the securities borrowed from us as contractually agreed. In addition, if we default by not returning collateral received, the counterparty has a right of set-off against our securities or any other amounts due to us.

Shown below are our financial instruments that either meet the accounting requirements that allow them to be offset in our balance sheets or that are subject to an enforceable master netting arrangement or similar agreement. Our accounting policy is to not offset these financial instruments in our balance sheets. Net amounts disclosed below have been reduced by the amount of collateral pledged to or received from our counterparties.

	September 30, 2023
	Gross Amount						Gross Amount Not
	of Recognized		Gross Amount		Net Amount		Offset in Balance Sheet
	Financial		Offset in		Presented in		Financial		Cash		Net
	Instruments		Balance Sheet		Balance Sheet		Instruments		Collateral		Amount
	(in millions of dollars)
Financial Assets:
Derivatives	$	74.8	$	—	$	74.8	$	(74.7)	$	—	$	0.1
Securities Lending	68.3		—		68.3		(8.7)		(59.6)		—
Total	$	143.1	$	—	$	143.1	$	(83.4)	$	(59.6)	$	0.1
Financial Liabilities:
Derivatives	$	212.7	$	—	$	212.7	$	(212.6)	$	—	$	0.1
Securities Lending	59.6		—		59.6		(59.6)		—		—
Total	$	272.3	$	—	$	272.3	$	(272.2)	$	—	$	0.1

	December 31, 2022
	Gross Amount						Gross Amount Not
	of Recognized		Gross Amount		Net Amount		Offset in Balance Sheet
	Financial		Offset in		Presented in		Financial		Cash		Net
	Instruments		Balance Sheet		Balance Sheet		Instruments		Collateral		Amount
	(in millions of dollars)
Financial Assets:
Derivatives	$	89.1	$	—	$	89.1	$	(38.0)	$	(49.4)	$	1.7
Securities Lending	152.4		—		152.4		(63.9)		(88.5)		—
Total	$	241.5	$	—	$	241.5	$	(101.9)	$	(137.9)	$	1.7
Financial Liabilities:
Derivatives	$	74.0	$	—	$	74.0	$	(73.2)	$	—	$	0.8
Securities Lending	88.5		—		88.5		(88.5)		—		—
Total	$	162.5	$	—	$	162.5	$	(161.7)	$	—	$	0.8

Net Investment Income

Net investment income reported in our consolidated statements of income is presented below.

	Three Months Ended September 30				Nine Months Ended September 30
	2023		2022		2023		2022
	(in millions of dollars)
Fixed Maturity Securities	$	457.9	$	456.7	$	1,383.7	$	1,379.9
Derivatives	11.6		14.9		34.5		45.1
Mortgage Loans	22.9		24.7		69.8		77.6
Policy Loans	5.4		5.1		15.6		14.8
Other Long-term Investments
Perpetual Preferred Securities1	0.4		1.1		2.2		3.2
Private Equity Partnerships2	22.6		12.6		56.7		98.6
Other	2.6		3.6		7.1		7.4
Short-term Investments	19.1		5.9		49.4		9.2
Gross Investment Income	542.5		524.6		1,619.0		1,635.8
Less Investment Expenses	13.5		10.0		44.0		29.1
Less Investment Income on Participation Fund Account Assets	3.0		3.0		9.1		8.9
Net Investment Income	$	526.0	$	511.6	$	1,565.9	$	1,597.8

1The net unrealized gain (loss) recognized in net investment income for the three and nine months ended September 30, 2023 related to perpetual preferred securities still held at September 30, 2023 was $(0.4) million and $0.1 million, respectively. The net unrealized gain (loss) recognized in net investment income for the three and nine months ended September 30, 2022 related to perpetual preferred securities still held at September 30, 2022 was $0.5 million and $1.5 million, respectively.

2The net unrealized gain recognized in net investment income for the three and nine months ended September 30, 2023 related to private equity partnerships still held at September 30, 2023 was $29.7 million and $72.6 million, respectively, reduced by net management fees and partnership expenses of $(7.1) million and $(15.9) million, respectively. The net unrealized gain recognized in net investment income for the three and nine months ended September 30, 2022 related to private equity partnerships still held at September 30, 2022 was $14.3 million and $106.8 million, respectively, reduced by net management fees and partnership expenses of $(1.8) million and $(8.3) million, respectively. See Note 3 for further discussion of private equity partnerships.

Investment Gain and Loss

Investment gains and losses are as follows:

	Three Months Ended September 30				Nine Months Ended September 30
	2023		2022		2023		2022
	(in millions of dollars)
Fixed Maturity Securities
Gross Gains on Sales	$	0.4	$	—	$	3.7	$	0.8
Gross Losses on Sales	(37.4)		(13.4)		(50.7)		(26.4)
Credit Losses	—		(0.5)		—		(4.6)
Mortgage Loans and Other Invested Assets
Gross Gains on Sales	—		—		6.0		1.4
Gross Losses on Sales	(0.9)		—		(1.0)		—
Impairment Loss	(3.0)		—		(3.0)		—
Change in Allowance for Credit Losses	0.9		(0.4)		(0.9)		(0.3)
Embedded Derivative in Modified Coinsurance Arrangement	9.2		14.9		14.7		10.7
All Other Derivatives	2.0		(0.9)		2.0		4.6
Foreign Currency Transactions	(2.2)		(4.1)		(0.8)		(8.5)
Net Investment Gain (Loss)	$	(31.0)	$	(4.4)	$	(30.0)	$	(22.3)

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Derivative Financial Instruments

9 Months Ended

Sep. 30, 2023

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Derivative Financial Instruments

Note 5 - Derivative Financial Instruments

Purpose of Derivatives

We are exposed to certain risks relating to our ongoing business operations. The primary risks managed by using derivative instruments are interest rate risk, risk related to matching duration for our assets and liabilities, foreign currency risk, credit risk, and equity risk. Historically, we have utilized current and forward interest rate swaps, current and forward currency swaps, forward benchmark interest rate locks, currency forward contracts, forward contracts on specific fixed income securities, credit default swaps, and total return swaps. Transactions hedging interest rate risk are primarily associated with our individual and group long-term care and individual and group disability products. All other product portfolios are periodically reviewed to determine if hedging strategies would be appropriate for risk management purposes. We do not use derivative financial instruments for speculative purposes.

Derivatives designated as cash flow hedges and used to reduce our exposure to interest rate and duration risk are as follows:

•Interest rate swaps were used to hedge interest rate risks and to improve the matching of assets and liabilities. An interest rate swap is an agreement in which we agree with other parties to exchange, at specified intervals, the difference between fixed rate and variable rate interest amounts. We used interest rate swaps to hedge the anticipated purchase of fixed maturity securities thereby protecting us from the potential adverse impact of declining interest rates on the associated policy reserves. We also used interest rate swaps to hedge the potential adverse impact of rising interest rates in anticipation of issuing fixed rate long-term debt.

•Forward benchmark interest rate locks are used to minimize interest rate risk associated with the anticipated purchase or disposal of fixed maturity securities or the anticipated issuance of fixed rate long-term debt. A forward benchmark interest rate lock is a derivative contract without an initial investment where we and the counterparty agree to purchase or sell a specific benchmark interest rate fixed maturity bond at a future date at a predetermined price or yield.

Derivatives designated as either cash flow or fair value hedges and used to reduce our exposure to foreign currency risk are as follows:

•Foreign currency interest rate swaps are used to hedge the currency risk of certain foreign currency-denominated fixed maturity securities owned for portfolio diversification. Under these swap agreements, we agree to pay, at specified intervals, fixed rate foreign currency-denominated principal and interest payments in exchange for fixed rate payments in the functional currency of the operating segment.

Derivatives not designated as hedging instruments and used to reduce our exposure to foreign currency risk, credit losses on securities owned and volatility of the underlying deferred assets in our non-qualified defined contribution plan are as follows:

•Foreign currency interest rate swaps previously designated as hedges were used to hedge the currency risk of certain foreign currency-denominated fixed maturity securities owned for portfolio diversification. These derivatives were effective hedges prior to novation to a new counterparty. In conjunction with the novation, these derivatives were de-designated as hedges. We agree to pay, at specified intervals, fixed rate foreign currency-denominated principal and interest payments in exchange for fixed rate payments in the functional currency of the operating segment. We hold offsetting swaps wherein we agree to pay fixed rate principal and interest payments in the functional currency of the operating segment in exchange for fixed rate foreign currency-denominated payments.

•Credit default swaps were used as economic hedges against credit risk but do not qualify for hedge accounting. A credit default swap is an agreement in which we agree with another party to pay, at specified intervals, a fixed-rate fee in exchange for insurance against a credit event on a specific investment. If a defined credit event occurred, our counterparty could have either paid us a net cash settlement, or we could have surrendered the specific investment to them in exchange for cash equal to the full notional amount of the swap. Credit events typically include events such as bankruptcy, failure to pay, or certain types of debt restructuring.

•Foreign currency forward contracts are used to minimize foreign currency risk. A foreign currency forward is a derivative without an initial investment where we and the counterparty agree to exchange a specific amount of currencies, at a specific exchange rate, on a specific date. We use these forward contracts to hedge the currency risk arising from foreign-currency denominated investments.

•Total Return Swaps are used to economically hedge a portion of the liability related to our non-qualified defined contribution plan. A total return swap is an agreement in which we pay a floating rate of interest to the counterparty and receive the total return on a portfolio of mutual funds. These swaps are cash settled on the last day of every month and the notional is re-established each month based on periodic distributions from and contributions to the plan assets.

Derivative Risks

The basic types of risks associated with derivatives are market risk (that the value of the derivative will be adversely impacted by changes in the market, primarily the change in interest and exchange rates) and credit risk (that the counterparty will not perform according to the terms of the contract). The market risk of the derivatives should generally offset the market risk associated with the hedged financial instrument or liability. To help limit the credit exposure of the derivatives, we enter into master netting agreements with our counterparties whereby contracts in a gain position can be offset against contracts in a loss position. We also typically enter into bilateral, cross-collateralization agreements with our counterparties to help limit the credit exposure of the derivatives. These agreements require the counterparty in a loss position to submit acceptable collateral with the other counterparty in the event the net loss position meets or exceeds an agreed upon amount. Credit exposure on derivatives is limited to the value of those contracts in a net gain position, including accrued interest receivable less collateral held. Our credit exposure on derivatives was a nominal amount at September 30, 2023. As of December 31, 2022, we had $1.7 million credit exposure on derivatives. The table below summarizes the nature and amount of collateral received from and posted to our derivative counterparties.

	September 30, 2023		December 31, 2022
	(in millions of dollars)
Carrying Value of Collateral Received from Counterparties
Cash	$	—	$	49.4
Fixed Maturity Securities	17.8		—
	$	17.8	$	49.4
Carrying Value of Collateral Posted to Counterparties
Cash	$	4.6	$	5.1
Fixed Maturity Securities	166.0		39.6
	$	170.6	$	44.7

See Note 4 for further discussion of our master netting agreements.

The majority of our derivative instruments contain provisions that require us to maintain specified issuer credit ratings and financial strength ratings. Should our ratings fall below these specified levels, we would be in violation of the provisions, and our derivatives counterparties could terminate our contracts and request immediate payment. The aggregate fair value of all derivative instruments with credit risk-related contingent features that were in a liability position was $212.7 million and $74.0 million at September 30, 2023 and December 31, 2022, respectively.

Cash Flow Hedges

As of September 30, 2023 and December 31, 2022, we had $156.4 million and $168.9 million, respectively, notional amount of receive fixed, pay fixed, open current and forward foreign currency interest rate swaps to hedge fixed income foreign currency-denominated securities.

As of September 30, 2023 and December 31, 2022, we had $1,290.0 million and $764.0 million, respectively, notional amount of forward benchmark interest rate locks to hedge the anticipated purchase of fixed maturity securities.

As of September 30, 2023, we expect to amortize approximately $21.4 million of net deferred gains on derivative instruments during the next twelve months. This amount will be reclassified from AOCI into earnings and reported on the same income statement line item as the hedged item. The income statement line items that will be affected by this amortization are net investment income and interest and debt expense. Additional amounts that may be reclassified from AOCI into earnings to offset the earnings impact of foreign currency translation of hedged items are not estimable.

As of September 30, 2023, we are hedging the variability of future cash flows associated with forecasted transactions through the year 2063.

Fair Value Hedges

As of September 30, 2023 and December 31, 2022, we had $603.6 million and $557.8 million, respectively, notional amount of receive fixed, pay fixed, open current and forward foreign currency interest rate swaps to hedge fixed income foreign currency-denominated securities.

The following table summarizes the carrying amount of hedged assets and the related cumulative basis adjustments related to our fair value hedges:

	Carrying Amount of Hedged Assets				Cumulative Amount of Fair Value Hedging Adjustment Included in the Carrying Amount of the Hedged Assets
	September 30, 2023		December 31, 2022		September 30, 2023		December 31, 2022
	(in millions of dollars)
Fixed maturity securities:
Receive fixed functional currency interest, pay fixed foreign currency interest	$	429.0	$	394.4	$	(33.5)	$	(24.8)

For the three and nine months ended September 30, 2023, $(19.4) million and $(26.6) million, respectively, of the derivative instruments' loss was excluded from the assessment of hedge effectiveness. For the three and nine months ended September 30, 2022, $0.2 million and $13.9 million, respectively, of the derivative instruments' gain was excluded from the assessment of hedge effectiveness. There were no instances wherein we discontinued fair value hedge accounting due to a hedged firm commitment no longer qualifying as a fair value hedge.

Derivatives not Designated as Hedging Instruments

At both September 30, 2023 and December 31, 2022, we held $132.0 million notional amount of receive fixed, pay fixed, foreign currency interest rate swaps. These derivatives are not designated as hedges, and as such, changes in fair value related to these derivatives are reported in earnings as a component of net investment gain or loss.

As of September 30, 2023 and December 31, 2022, we held $53.2 million and $54.3 million, respectively, notional amount of foreign currency forwards to mitigate the foreign currency risk associated with specific securities owned. These derivatives are not designated as hedges, and as such, changes in fair value related to these derivatives are reported in earnings as a component of net investment gain or loss.

As of September 30, 2023 and December 31, 2022, we held $89.0 million and $76.9 million, respectively, notional amount of total return swaps to mitigate the volatility associated with changes in the fair value of the underlying notional assets in our non-qualified defined contribution plan. This derivative is an economic hedge not designated as a hedging instrument, and changes in fair value are reported as a component of other expenses in our income statement.

We have an embedded derivative in a modified coinsurance arrangement for which we include in our net investment gains and losses, a calculation intended to estimate the value of the option of our reinsurance counterparty to cancel the reinsurance contract with us. However, neither party can unilaterally terminate the reinsurance agreement except in extreme circumstances resulting from regulatory supervision, delinquency proceedings, or other direct regulatory action. Cash settlements or collateral related to this embedded derivative are not required at any time during the reinsurance contract or at termination of the reinsurance contract. There are no credit-related counterparty triggers, and any accumulated embedded derivative gain or loss reduces to zero over time as the reinsured business winds down.

Locations and Amounts of Derivative Financial Instruments

The following tables summarize the notional amounts and fair values of derivative financial instruments, as reported in our consolidated balance sheets. Derivative assets are included in other long-term investments, while derivative liabilities are included in other liabilities within our consolidated balance sheets. The notional amounts represent the basis upon which our counterparty pay and receive amounts are calculated.

	September 30, 2023
			Derivative Assets		Derivative Liabilities
	Notional Amount		Fair Value		Fair Value
	(in millions of dollars)
Designated as Hedging Instruments
Cash Flow Hedges
Forward Benchmark Interest Rate Locks	$	1,290.0	$	—	$	184.1
Foreign Currency Interest Rate Swaps	156.4		16.7		2.5
Total Cash Flow Hedges	1,446.4		16.7		186.6
Fair Value Hedges
Foreign Currency Interest Rate Swaps	603.6		53.1		9.7
Total Designated as Hedging Instruments	$	2,050.0	$	69.8	$	196.3
Not Designated as Hedging Instruments
Foreign Currency Forwards	$	53.2	$	5.0	$	—
Foreign Currency Interest Rate Swaps	132.0		—		16.4
Total Return Swaps	89.0		—		—
Embedded Derivative in Modified Coinsurance Arrangement	—		0.9		—
Total Not Designated as Hedging Instruments	$	274.2	$	5.9	$	16.4
Total Derivatives	$	2,324.2	$	75.7	$	212.7

	December 31, 2022
			Derivative Assets		Derivative Liabilities
	Notional Amount		Fair Value		Fair Value
	(in millions of dollars)
Designated as Hedging Instruments
Cash Flow Hedges
Forward Benchmark Interest Rate Locks	$	764.0	$	1.6	$	48.4
Foreign Currency Interest Rate Swaps	168.9		17.5		3.1
Total Cash Flow Hedges	932.9		19.1		51.5
Fair Value Hedges
Foreign Currency Interest Rate Swaps	557.8		66.0		5.4
Total Designated as Hedging Instruments	$	1,490.7	$	85.1	$	56.9
Not Designated as Hedging Instruments
Foreign Currency Forwards	$	54.3	$	4.0	$	0.1
Foreign Currency Interest Rate Swaps	132.0		—		17.0
Total Return Swaps	76.9		—		—
Embedded Derivative in Modified Coinsurance Arrangement	—		—		13.9
Total Not Designated as Hedging Instruments	$	263.2	$	4.0	$	31.0
Total Derivatives	$	1,753.9	$	89.1	$	87.9

The following tables summarize the location of gains and losses of derivative financial instruments designated as hedging instruments, as reported in our consolidated statements of income.

	Three Months Ended September 30
	2023						2022
	Net Investment Income		Net Investment Gain (Loss)		Interest and Debt Expense		Net Investment Income		Net Investment Gain (Loss)		Interest and Debt Expense
	(in millions of dollars)
Total Income and Expense Presented in the Consolidated Statements of Income of Which Hedged Items are Recorded	$	526.0	$	(31.0)	$	48.6	$	511.6	$	(4.4)	$	47.0
Gain (Loss) on Cash Flow Hedging Relationships
Interest Rate Swaps:
Hedged items	49.7		—		0.7		50.2		—		0.7
Derivatives Designated as Hedging Instruments	8.3		—		—		14.1		—		—
Foreign Exchange Contracts:
Hedged items	2.3		(0.1)		—		2.7		(0.5)		—
Derivatives Designated as Hedging Instruments	0.4		—		—		(1.5)		—		—
Forward Benchmark Interest Rate Locks:
Hedged items	3.9		—		—		0.2		—		—
Derivatives Designated as Hedging Instruments	(0.1)		—		—		—		—		—
Gain (Loss) on Fair Value Hedging Relationships
Foreign Exchange Contracts
Hedged items	3.9		(15.2)		—		2.9		(29.6)		—
Derivatives Designated as Hedging Instruments	3.1		15.2		—		1.0		29.6		—

	Nine Months Ended September 30
	2023						2022
	Net Investment Income		Net Investment Gain (Loss)		Interest and Debt Expense		Net Investment Income		Net Investment Gain (Loss)		Interest and Debt Expense
	(in millions of dollars)
Total Income and Expense Presented in the Consolidated Statements of Income of Which Hedged Items are Recorded	$	1,565.9	$	(30.0)	$	145.6	$	1,597.8	$	(22.3)	$	141.3
Gain (Loss) on Cash Flow Hedging Relationships
Interest Rate Swaps:
Hedged items	148.2		0.8		2.2		150.9		—		2.1
Derivatives Designated as Hedging Instruments	27.7		—		—		40.5		—		—
Foreign Exchange Contracts:
Hedged items	7.3		(0.1)		—		8.3		(0.5)		—
Derivatives Designated as Hedging Instruments	0.6		0.1		—		(0.9)		—		—
Forward Benchmark Interest Rate Locks:
Hedged items	7.7		—		—		0.2		—		—
Derivatives Designated as Hedging Instruments	(0.1)		—		—		—		—		—
Gain (Loss) on Fair Value Hedging Relationships
Foreign Exchange Contracts
Hedged items	10.3		(8.7)		—		8.7		(62.5)		—
Derivatives Designated as Hedging Instruments	6.7		8.7		—		5.1		62.5		—

The following table summarizes the location of gains and losses of derivative financial instruments designated as cash flow hedging instruments, as reported in our consolidated statements of comprehensive income (loss).

	Three Months Ended September 30				Nine Months Ended September 30
	2023		2022		2023		2022
	(in millions of dollars)
Gain (Loss) Recognized in Other Comprehensive Income (Loss) on Derivatives
Forwards	$	(158.9)	$	(34.3)	$	(159.7)	$	(32.0)
Foreign Exchange Contracts	3.4		7.1		0.7		11.4
Total	$	(155.5)	$	(27.2)	$	(159.0)	$	(20.6)

The following table summarizes the location of gains and losses on our derivatives not designated as hedging instruments, as reported in our consolidated statements of income.

	Three Months Ended September 30				Nine Months Ended September 30
	2023		2022		2023		2022
	(in millions of dollars)
Net Investment Gain (Loss)
Foreign Exchange Contracts	$	2.0	$	(0.9)	$	2.0	$	4.6
Embedded Derivative in Modified Coinsurance Arrangement	9.2		14.9		14.7		10.7
Total	$	11.2	$	14.0	$	16.7	$	15.3
Other Expenses
(Gain) Loss on Total Return Swaps	$	4.1	$	4.3	$	(4.7)	$	23.0

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Accumulated Other Comprehensive Income (Loss)

9 Months Ended

Sep. 30, 2023

Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]

Accumulated Other Comprehensive Income (Loss)

Components of our accumulated other comprehensive loss, after tax, and related changes are as follows:

	Net Unrealized Gain (Loss) on Securities		Effect of Change in Discount Rate Assumptions on the LFPB1		Net Gain (Loss) on Hedges		Foreign Currency Translation Adjustment		Unrecognized Pension and Postretirement Benefit Costs		Total
	(in millions of dollars)
Balance at June 30, 2023	$	(2,762.6)	$	0.1	$	(33.3)	$	(327.1)	$	(334.7)	$	(3,457.6)
Other Comprehensive Income (Loss) Before Reclassifications	(1,215.1)		1,688.4		(137.9)		(55.1)		2.5		282.8
Amounts Reclassified from Accumulated Other Comprehensive Income or Loss	29.3		—		(6.5)		—		1.4		24.2
Net Other Comprehensive Income (Loss)	(1,185.8)		1,688.4		(144.4)		(55.1)		3.9		307.0
Balance at September 30, 2023	$	(3,948.4)	$	1,688.5	$	(177.7)	$	(382.2)	$	(330.8)	$	(3,150.6)
Balance at June 30, 2022	$	(1,560.4)	$	(1,541.2)	$	46.4	$	(367.5)	$	(386.8)	$	(3,809.5)
Other Comprehensive Income (Loss) Before Reclassifications	(1,937.0)		2,222.9		(23.0)		(71.5)		2.8		194.2
Amounts Reclassified from Accumulated Other Comprehensive Income or Loss	11.1		—		(9.9)		—		3.1		4.3
Net Other Comprehensive Income (Loss)	(1,925.9)		2,222.9		(32.9)		(71.5)		5.9		198.5
Balance at September 30, 2022	$	(3,486.3)	$	681.7	$	13.5	$	(439.0)	$	(380.9)	$	(3,611.0)
Balance at December 31, 2022	$	(3,028.4)	$	313.9	$	(9.6)	$	(390.1)	$	(334.1)	$	(3,448.3)
Other Comprehensive Income (Loss) Before Reclassifications	(957.2)		1,374.6		(146.4)		7.9		(0.9)		278.0
Amounts Reclassified from Accumulated Other Comprehensive Income or Loss	37.2		—		(21.7)		—		4.2		19.7
Net Other Comprehensive Income (Loss)	(920.0)		1,374.6		(168.1)		7.9		3.3		297.7
Balance at September 30, 2023	$	(3,948.4)	$	1,688.5	$	(177.7)	$	(382.2)	$	(330.8)	$	(3,150.6)
Balance at December 31, 2021	$	4,014.4	$	(8,570.7)	$	61.8	$	(274.1)	$	(396.0)	$	(5,164.6)
Other Comprehensive Income (Loss) Before Reclassifications	(7,524.6)		9,252.4		(17.1)		(164.9)		5.9		1,551.7
Amounts Reclassified from Accumulated Other Comprehensive Income or Loss	23.9		—		(31.2)		—		9.2		1.9
Net Other Comprehensive Income (Loss)	(7,500.7)		9,252.4		(48.3)		(164.9)		15.1		1,553.6
Balance at September 30, 2022	$	(3,486.3)	$	681.7	$	13.5	$	(439.0)	$	(380.9)	$	(3,611.0)
1Liability for Future Policy Benefits

Amounts reclassified from accumulated other comprehensive loss were recognized in our consolidated statements of income as follows:

	Three Months Ended September 30				Nine Months Ended September 30
	2023		2022		2023		2022
	(in millions of dollars)
Net Unrealized Loss on Securities
Net Investment Loss
Net Loss on Sales of Fixed Maturity Securities	$	(37.0)	$	(13.4)	$	(47.0)	$	(25.6)
Credit Losses on Fixed Maturity Securities	—		(0.5)		—		(4.6)
	(37.0)		(13.9)		(47.0)		(30.2)
Income Tax Benefit	(7.7)		(2.8)		(9.8)		(6.3)
Total	$	(29.3)	$	(11.1)	$	(37.2)	$	(23.9)
Net Gain (Loss) on Hedges
Net Investment Income
Gain on Interest Rate Swaps and Forwards	$	8.3	$	14.1	$	27.6	$	40.5
Loss on Foreign Exchange Contracts	(0.1)		(1.5)		(0.2)		(1.0)
Net Investment Gain
Gain on Foreign Exchange Contracts	—		—		0.1		—
	8.2		12.6		27.5		39.5
Income Tax Expense	1.7		2.7		5.8		8.3
Total	$	6.5	$	9.9	$	21.7	$	31.2
Unrecognized Pension and Postretirement Benefit Costs
Other Expenses
Amortization of Net Actuarial Loss	$	(1.8)	$	(4.0)	$	(5.4)	$	(11.8)
Amortization of Prior Service Credit	—		0.1		0.1		0.2
	(1.8)		(3.9)		(5.3)		(11.6)
Income Tax Benefit	(0.4)		(0.8)		(1.1)		(2.4)
Total	$	(1.4)	$	(3.1)	$	(4.2)	$	(9.2)

XML

Liability for Future Policy Benefits, Policyholder's Account Balances, and Deferred Acquisition Costs

9 Months Ended

Sep. 30, 2023

Insurance [Abstract]

Long-Duration Insurance Contracts Disclosure

Liabilities for future policy benefits represent the cost of claims that we estimate we will eventually pay to our policyholders which includes policy liabilities for claims not yet incurred and for claims that have been incurred or are estimated to have been incurred but not yet reported to us. Liabilities for future policy benefits also include the related expenses for our non interest-sensitive life and accident and health products. The liability for future policy benefits is calculated based on the present value of the estimated future policy benefits less the present value of estimated future net premiums collected. Net premiums represent the portion of the gross premium required to provide for all benefits and expenses, excluding acquisition costs or any costs that are required to be charged to expense as incurred. In calculating the liability for future policy benefits, our long-duration contracts are grouped into cohorts by product type and contract issue year.

The calculation of the liability for future policy benefits involves numerous assumptions including assumptions related to discount rate, lapses, mortality, and morbidity. The discount rate assumptions were initially set based on the expected investment yield of the assets supporting the reserves at the transition date of ASU 2018-12, which was January 1, 2021, for policies originally issued on or before the transition date. The discount rate assumptions for new cohorts established after the transition date, are initially set based on the policy issuance date or policy renewal date, and are based on an upper-medium grade fixed-income instrument, which is generally equivalent to a single-A interest rate matched to the duration of our insurance liabilities. As cohorts are grouped by product type and issue year, a weighted average discount rate is utilized as policies are issued or renewed throughout the year. We utilize a reference portfolio of fixed-income instruments that have been A-rated by one of the major credit rating agencies. For products with liability cash flows that exceed the duration of observable single-A fixed income instruments, we use the last market observable yield and use extrapolation approaches to determine yield assumptions for durations beyond the last market observable duration. For the discount rate assumptions for products in our Unum International segment, we utilize observable market data in the local debt markets in the UK and Poland.

The initial, also referred to as the original, discount rate assumptions established for each cohort are used to determine interest accretion which is reported as a component of policy benefits on the statements of income. After policy issuance or policy renewal, the discount rate assumptions are updated quarterly and used to update the liability at each reporting date to the current discount rate, with the corresponding change reflected as the change in the effect of discount rate assumptions on the liability for future policy benefits, net of reinsurance, on the statement of changes in other comprehensive income (loss). The weighted average current discount rate was 5.6 percent at September 30, 2023 compared to 5.0 percent at December 31, 2022. The weighted average current discount rate was 5.2 percent at September 30, 2022 compared to 2.5 percent at December 31, 2021. The increase in weighted average current discount rate during both periods is due primarily to an increase in U.S. Treasury rates.

Policyholder lapse and mortality assumptions reflect the probability that an insureds’ coverage is discontinued due to lapsation or death of the insured. For our life insurance products, mortality assumptions also reflect the probability that a benefit payment occurs. Policyholder lapse and mortality assumptions are based on our actual historical experience adjusted for future expectations. Claim incidence and claim resolution rate assumptions related to morbidity and mortality are based on actual experience or industry standards adjusted as appropriate to reflect our actual experience and future expectations. The claim incidence rate assumption is the rate at which new claims are submitted and the development of this assumption may involve many factors, including the age of the insured, the insured's occupation or industry, the benefit plan design, and certain external factors such as consumer confidence and levels of unemployment. The claim resolution rate assumption is the probability that a claim will close due to recovery or death of the insured and is used to estimate how long benefits will be paid on an open claim. Certain product lines may utilize additional assumptions in calculating the liability for future policy benefits in addition to those listed above such as premium rate increases for long-term care, benefit offsets for long-term disability, and claim costs for voluntary benefits. Claim costs capture the combined effect of the incidence rate, the expected level of benefit to be paid, and the claim resolution rate.

Cash flow assumptions are reviewed and updated, as needed, at least annually. Assumptions may be updated more frequently if necessary based on trending experience and future expectations. On a quarterly basis, cohort level cash flow measures are updated based on the emergence of actual experience. The updated cash flows are used to determine the updated net premiums and the net premium ratio, which is the present value of benefits and related expenses divided by the present value of gross premiums. The updated net premium ratio is used to calculate the updated liability for future policy benefits as of the beginning of the year, at the original discount rate. The change in the liability for future policy benefits, at the original discount rate, as of the beginning of the period, resulting from changes in cash flow assumptions and resulting from the emergence of actual experience from expected experience, is reflected as the policy benefits - remeasurement loss (gain) in the consolidated

statements of income. The impact of all other changes in the liability for future policy benefits are reflected as policy benefits in the consolidated statements of income.

For most products, a net premium methodology is applied to each cohort to estimate the liability for claims not yet incurred in which discounted gross benefits are compared to discounted gross premiums. In this methodology, actual experience to date is combined with projected future cash flows to determine a net premium ratio for each cohort. The future cash flows include the costs of future expected claims as well as future cash flows on claims that have already been incurred. The net premium ratio is then used to estimate the liability for future policy benefits. The liability for future policy benefits represents the present value of future claims and associated expenses less the present value of future net premiums, which is derived by multiplying the present value of future gross premium by the net premium ratio.

For our group products in the Unum US and Unum International segments, we evaluate the liability for future policy benefits required for active policies in comparison to incurred claims. Given the term nature of the products, their renewal features, and level funding nature of the premium for these products, we have determined that the liability value is generally zero for policies that are not on claim. In this situation, our liability for future policy benefit values are limited to the liability associated with claims incurred as of the valuation date.

Multiple estimation methods exist to establish liabilities for the incurred claim component of future policy benefits. Available reserving methods utilized to calculate these liabilities include the tabular reserve method, the paid loss development method, the incurred loss development method, the count and severity method, and the expected claim cost method. No single method is better than the others in all situations and for all product lines. The estimation methods we have chosen are those that we believe produce the most accurate and reliable liability.

We use a tabular reserve methodology on reported claims for our Unum US group long-term disability and individual disability claims as well as for our Closed Block long-term care claims. Under the tabular reserve methodology, the liability for reported claims is based on certain characteristics of the actual reported claimants and their related policy provisions, such as age, length of time disabled, and medical diagnosis, as well as assumptions regarding claim duration, discount rate, and policy benefit offsets. We believe the tabular reserve method is the most accurate to calculate long-term liabilities and allows us to use the most available known facts about each claim. Incurred, but not reported (IBNR) liabilities for future policy benefits for our longer-term products are calculated using the count and severity method using historical patterns of the claims to be reported and the associated claim costs. For Unum US group short-term disability products, an estimate of the value of future payments to be made on claims already submitted, as well as on IBNR claims, is determined in aggregate using a paid loss development method rather than on the individual claimant basis that we use for reported claims on longer-term products. The average length of time between the event triggering a claim under a policy and the final resolution of those claims is much shorter for these products and results in less estimation variability.

Liabilities for claims for Unum US group life and accidental death and dismemberment products are related primarily to death claims reported but not yet paid, IBNR death claims, and a liability for waiver of premium benefits in the event the policyholder becomes disabled. The death claim liability is based on the actual face amount to be paid, the IBNR liability is calculated using the count and severity method based on historical patterns of the claims, and the waiver of premium benefits liability is calculated using the tabular reserve methodology.

Liabilities for claims related to the group and individual dental and vision products reported in our Unum US and Colonial Life segments have a short claim payout period. As a result, the liabilities, which primarily represent IBNR and a small amount of claims pending payment, are calculated using the paid loss development method.

Liabilities for future policy benefits supporting the group products within our Unum International segment are calculated using generally the same methodology that we use for Unum US group disability and group life liabilities. Liabilities for future policy benefits for our Unum UK group life dependent product, which provides an annuity to the beneficiary upon the death of an employee, are calculated using discounted cash flows, based on our assumptions for claim duration and discount rates. The assumptions used in calculating liabilities for future policy benefits for this segment are based on standard country-specific industry experience, adjusted for our own experience.

Certain products in the Colonial Life segment and the Unum US voluntary benefits product line have shorter-term benefits, which generally have less estimation variability than our longer-term products because of the shorter claim payout period. Our liabilities for future policy benefits for these lines of business are predominantly determined using the incurred loss development method based on our own experience. The incurred loss development method uses the historical patterns of payments by loss date to predict future claim payments for each loss date. Where the incurred loss development method may not be appropriate, we estimate the incurred claims using an expected claim cost per policy or other measure of exposure.

During the third quarter of 2023, we completed our annual cash flow assumption review and updated certain of our assumptions used to develop the liability for future policy benefits which resulted in a net increase to the liability. The increase to the liability for future policy benefits was driven primarily by assumption updates in our Closed Block long-term care product line, partially offset by assumption updates in the Unum US group disability product line and in the Colonial Life segment. The long-term care assumption updates were primarily driven by lower expectations for active policy lapse and mortality assumptions, partially offset by an increase to expected future premium rate increases. The Unum US group disability product line assumption updates were primarily related to claim resolution assumptions driven by favorable claim recovery trends, while the Colonial Life segment assumption updates were driven by improved claim cost assumptions and increases in policyholder lapse rates.

During the third quarter of 2022, we completed our annual cash flow assumption review and updated certain of our assumptions used to develop the liability for future policy benefits which resulted in a net increase to the liability. The increase to the liability for future policy benefits was driven primarily by assumption updates related to the reinsured portion of our Closed Block segment, mostly offset by assumption updates in the Unum US segment and the Colonial Life segment. The Closed Block segment assumption updates related to the reinsured portion of our all other product line primarily included updates to mortality assumptions for the advanced age portion of our individual disability claimant population. This advanced age claimant population was included in the block ceded as a part of the Closed Block individual disability reinsurance transaction with Commonwealth Annuity and Life Insurance Company. As a result, a corresponding increase was reported in our consolidated balance sheet as a reinsurance recoverable related to these assumption updates. The Unum US segment assumption updates were primarily driven by sustained improvement in claim recovery trends in our group disability and group life product lines, partially offset by lower social security benefit offsets in our group disability product line. The Colonial Life segment assumption updates were primarily driven by improved claim cost assumptions.

Actual variance from expected experience for the first nine months of 2023 and 2022 was driven primarily by our Unum US group disability and Unum US group life and accidental death and dismemberment product lines. The variance for both periods was primarily due to higher than expected claim resolutions driven by recoveries in the Unum US group disability product line and lower than expected new claim incidence for waiver of premium benefits in the Unum US group life and accidental death and dismemberment product line. The variance for the first nine months of 2023 is also impacted by our Closed Block long-term care product line and our Unum US individual disability product line. The variance for our Closed Block long-term care product line was driven by higher than expected incidence, while the variance in our Unum US individual disability product line was driven primarily by lower than expected new claim incidence. The variance for the first nine months of 2022 was also impacted by our Colonial Life cancer and critical illness product line which was driven primarily by lower claim costs.

For the nine months ended September 30, 2023, there were certain cohorts within the Colonial Life segment, related to our cancer and critical illness product line, and certain cohorts within the Closed Block segment, related to our long-term care product line, for which net premiums exceeded gross premiums. The cohorts for which net premiums exceeded the gross premiums in the Closed Block long-term care product line resulted in a $215.5 million reduction to income before income tax for the nine months ended September 30, 2023. For the nine months ended September 30, 2023 and 2022, the cohorts for which net premiums exceeded the gross premiums in the Colonial Life cancer and critical illness product line had an immaterial impact to income before income tax. There were no other product lines with cohorts for which net premiums exceeded gross premiums for the nine months ended September 30, 2023 or 2022.

The following table presents balances as well as the changes in the liability for future policy benefits for traditional long duration products.

	Consolidated
	September 30
	2023		2022
	(in millions of dollars)
Present Value of Expected Net Premiums
Balance, beginning of year	$	12,426.2	$	15,881.3
Beginning balance at original discount rate	12,695.3		13,186.2
Effect of changes in cash flow assumptions	1,499.2		(101.9)
Effect of actual variances from expected experience	(121.8)		(252.3)
Adjusted beginning of year balance	14,072.7		12,832.0
Issuances	861.2		727.2
Interest accretion	430.8		430.0
Net premiums collected	(1,164.9)		(1,184.1)
Foreign currency	(0.1)		(49.5)
Ending balance at original discount rate	14,199.7		12,755.6
Effect of change in discount rate assumptions	(709.0)		(418.5)
Balance, end of period	$	13,490.7	$	12,337.1
Present Value of Expected Future Policy Benefits
Balance, beginning of year	$	48,929.4	$	65,305.0
Beginning balance at original discount rate	49,689.0		50,397.2
Effect of changes in cash flow assumptions	1,702.0		(92.4)
Effect of actual variances from expected experience	(356.4)		(459.6)
Adjusted beginning of year balance	51,034.6		49,845.2
Issuances1	2,547.0		2,602.7
Interest accretion	1,670.3		1,689.3
Benefit payments	(4,106.1)		(4,112.1)
Foreign currency	19.6		(485.7)
Ending balance at original discount rate	51,165.4		49,539.4
Effect of change in discount rate assumptions	(3,111.7)		(1,484.8)
Balance, end of period	$	48,053.7	$	48,054.6
Net liability for future policy benefits	$	34,563.0	$	35,717.5
Other	1,703.3		1,872.7
Total liability for future policy benefits	36,266.3		37,590.2
Less: Reinsurance recoverable related to future policy benefits	7,449.0		8,154.6
Net liability for future policy benefits, after reinsurance recoverable	$	28,817.3	$	29,435.6
1Issuances include new policy issuances for most product lines. For our Unum US group disability, Unum US group life and AD&D and Closed Block - All Other product lines and certain of our Unum International product lines, this line represents new claim incurrals.

The following tables summarize the amount of gross premiums and interest accretion reflected in the statements of income as well as the undiscounted and discounted expected gross premiums and expected future benefit payments and the weighted average interest rates for traditional long duration products presented in the rollforward activity above.

	Consolidated
	Nine Months Ended September 30
	2023		2022
	(in millions of dollars)
Amount recognized in the statement of income:
Gross premiums or assessments	$	7,278.4	$	7,033.8
Interest accretion	$	1,239.5	$	1,259.3

	Consolidated
	September 30
	2023			2022
	(in millions of dollars, except weighted average data)
Amount of undiscounted:
Expected future benefit payments	$	105,306.1		$	97,202.5
Expected future gross premiums	$	38,581.4		$	35,301.8
Amount of discounted (at interest accretion rate):
Expected future gross premiums	$	25,435.2		$	23,835.8
Weighted average interest rate:
Interest accretion rate	4.8		%	4.8		%
Current discount rate	5.6		%	5.2		%
Weighted average duration of the liability	11.5 years			11.0 years

The following table presents the balances and changes in the reserves for future policy benefits for traditional long duration products in the Unum US segment.

	September 30, 2023
	Group Disability		Group Life and AD&D		Voluntary Benefits		Individual Disability		Total Unum US
	(in millions of dollars)
Present Value of Expected Net Premiums
Balance, beginning of year	$	—	$	—	$	868.2	$	1,202.9	$	2,071.1
Beginning balance at original discount rate	—		—		937.9		1,228.1		2,166.0
Effect of changes in cash flow assumptions	—		—		180.7		5.0		185.7
Effect of actual variances from expected experience	—		—		(98.2)		(13.6)		(111.8)
Adjusted beginning of year balance	—		—		1,020.4		1,219.5		2,239.9
Issuances	—		—		258.6		164.0		422.6
Interest accretion	—		—		21.4		36.3		57.7
Net premiums collected	—		—		(124.2)		(131.7)		(255.9)
Ending balance at original discount rate	—		—		1,176.2		1,288.1		2,464.3
Effect of change in discount rate assumptions	—		—		(119.4)		(62.2)		(181.6)
Balance, end of period	$	—	$	—	$	1,056.8	$	1,225.9	$	2,282.7
Present Value of Expected Future Policy Benefits
Balance, beginning of year	$	5,533.3	$	972.6	$	1,999.5	$	3,192.8	$	11,698.2
Beginning balance at original discount rate	5,793.1		998.5		2,141.2		3,244.5		12,177.3
Effect of changes in cash flow assumptions	(100.2)		—		170.1		7.9		77.8
Effect of actual variances from expected experience	(187.8)		(28.2)		(109.6)		(42.3)		(367.9)
Adjusted beginning of year balance	5,505.1		970.3		2,201.7		3,210.1		11,887.2
Issuances1	907.1		356.1		270.4		173.8		1,707.4
Interest accretion	137.6		15.8		64.3		123.2		340.9
Benefit payments	(1,186.8)		(402.1)		(143.9)		(203.5)		(1,936.3)
Ending balance at original discount rate	5,363.0		940.1		2,392.5		3,303.6		11,999.2
Effect of change in discount rate assumptions	(310.1)		(35.6)		(280.7)		(190.0)		(816.4)
Balance, end of period	$	5,052.9	$	904.5	$	2,111.8	$	3,113.6	$	11,182.8
Net liability for future policy benefits	$	5,052.9	$	904.5	$	1,055.0	$	1,887.7	$	8,900.1
Other	0.5		1.0		2.4		26.0		29.9
Total liability for future policy benefits	5,053.4		905.5		1,057.4		1,913.7		8,930.0
Less: Reinsurance recoverable related to future policy benefits	32.8		6.2		13.2		148.1		200.3
Net liability for future policy benefits, after reinsurance recoverable	$	5,020.6	$	899.3	$	1,044.2	$	1,765.6	$	8,729.7
1Issuances include new policy issuances for most product lines. Issuances for Unum US group disability and Unum US group life and AD&D represents new claim incurrals.

	September 30, 2022
	Group Disability		Group Life and AD&D		Voluntary Benefits		Individual Disability		Total Unum US
	(in millions of dollars)
Present Value of Expected Net Premiums
Balance, beginning of year	$	—	$	—	$	1,124.8	$	1,494.3	$	2,619.1
Beginning balance at original discount rate	—		—		1,032.3		1,279.6		2,311.9
Effect of changes in cash flow assumptions	—		—		(23.4)		(73.7)		(97.1)
Effect of actual variances from expected experience	—		—		(79.7)		(37.4)		(117.1)
Adjusted beginning of year balance	—		—		929.2		1,168.5		2,097.7
Issuances	—		—		126.0		123.5		249.5
Interest accretion	—		—		22.3		38.2		60.5
Net premiums collected	—		—		(128.6)		(130.5)		(259.1)
Ending balance at original discount rate	—		—		948.9		1,199.7		2,148.6
Effect of change in discount rate assumptions	—		—		(79.4)		(37.2)		(116.6)
Balance, end of period	$	—	$	—	$	869.5	$	1,162.5	$	2,032.0
Present Value of Expected Future Policy Benefits
Balance, beginning of year	$	6,725.7	$	1,124.1	$	2,697.3	$	4,017.3	$	14,564.4
Beginning balance at original discount rate	6,158.3		1,058.3		2,201.8		3,253.3		12,671.7
Effect of changes in cash flow assumptions	(102.0)		(32.9)		(39.9)		(53.4)		(228.2)
Effect of actual variances from expected experience	(174.1)		(29.0)		(82.3)		(43.1)		(328.5)
Adjusted beginning of year balance	5,882.2		996.4		2,079.6		3,156.8		12,115.0
Issuances1	1,038.9		377.5		140.5		131.1		1,688.0
Interest accretion	162.2		18.8		65.2		116.9		363.1
Benefit payments	(1,228.7)		(424.1)		(147.5)		(192.8)		(1,993.1)
Ending balance at original discount rate	5,854.6		968.6		2,137.8		3,212.0		12,173.0
Effect of change in discount rate assumptions	(284.6)		(32.5)		(167.5)		(95.7)		(580.3)
Balance, end of period	$	5,570.0	$	936.1	$	1,970.3	$	3,116.3	$	11,592.7
Net liability for future policy benefits	$	5,570.0	$	936.1	$	1,100.8	$	1,953.8	$	9,560.7
Other	0.5		0.9		15.1		24.7		41.2
Total liability for future policy benefits	5,570.5		937.0		1,115.9		1,978.5		9,601.9
Less: Reinsurance recoverable related to future policy benefits	36.8		6.0		23.4		189.7		255.9
Net liability for future policy benefits, after reinsurance recoverable	$	5,533.7	$	931.0	$	1,092.5	$	1,788.8	$	9,346.0
1Issuances include new policy issuances for most product lines. Issuances for Unum US group disability and Unum US group life and AD&D represents new claim incurrals.

The following tables summarize the amount of gross premiums and interest accretion reflected in the statements of income as well as the undiscounted and discounted expected gross premiums and expected future benefit payments and the weighted average interest rates for traditional long duration products in the Unum US segment presented in the rollforward activity above.

	Nine Months Ended September 30, 2023
	Group Disability		Group Life and AD&D		Voluntary Benefits		Individual Disability		Total Unum US
	(in millions of dollars)
Amount recognized in the statement of income:
Gross premiums or assessments	$	2,210.4	$	1,403.2	$	592.1	$	474.2	$	4,679.9
Interest accretion	$	137.6	$	15.8	$	42.9	$	86.9	$	283.2

	Nine Months Ended September 30, 2022
	Group Disability		Group Life and AD&D		Voluntary Benefits		Individual Disability		Total Unum US
	(in millions of dollars)
Amount recognized in the statement of income:
Gross premiums or assessments	$	2,073.5	$	1,396.0	$	583.1	$	446.9	$	4,499.5
Interest accretion	$	162.2	$	18.8	$	42.9	$	78.7	$	302.6

	September 30, 2023
	Group Disability			Group Life and AD&D			Voluntary Benefits			Individual Disability			Total Unum US
	(in millions of dollars, except weighted average data)
Amount of undiscounted:
Expected future benefit payments	$	6,474.2		$	1,069.2		$	5,107.4		$	5,292.7		$	17,943.5
Expected future gross premiums	$	—		$	—		$	5,317.5		$	5,701.8		$	11,019.3
Amount of discounted (at interest accretion rate):
Expected future gross premiums	$	—		$	—		$	3,663.8		$	4,099.5		$	7,763.3
Weighted average interest rate:
Interest accretion rate	4.0		%	2.3		%	5.0		%	5.1		%	4.2		%
Current discount rate	5.4		%	3.1		%	5.7		%	5.7		%	5.3		%
Weighted average duration of the liability	4.3 years			2.7 years			18.2 years			9.6 years			6.9 years

	September 30, 2022
	Group Disability			Group Life and AD&D			Voluntary Benefits			Individual Disability			Total Unum US
	(in millions of dollars, except weighted average data)
Amount of undiscounted:
Expected future benefit payments	$	7,077.3		$	1,124.5		$	4,555.1		$	5,112.5		$	17,869.4
Expected future gross premiums	$	—		$	—		$	4,006.6		$	5,461.8		$	9,468.4
Amount of discounted (at interest accretion rate):
Expected future gross premiums	$	—		$	—		$	2,970.1		$	3,916.2		$	6,886.3
Weighted average interest rate:
Interest accretion rate	3.8		%	2.4		%	5.1		%	5.1		%	4.1%
Current discount rate	5.0		%	3.1		%	5.3		%	5.2		%	4.9%
Weighted average duration of the liability	4.4 years			3.1 years			18.0 years			9.4 years			6.8 years

Unum International Segment

The following table presents the balances and changes in the reserves for future policy benefits for traditional long duration products in the Unum International segment.

	September 30
	2023		2022
	(in millions of dollars)
Present Value of Expected Net Premiums
Balance, beginning of year	$	197.1	$	260.5
Beginning balance at original discount rate	246.8		258.1
Effect of changes in cash flow assumptions	(5.1)		(0.3)
Effect of actual variances from expected experience	12.2		5.4
Adjusted beginning of year balance	253.9		263.2
Issuances	16.9		13.4
Interest accretion	6.9		6.5
Net premiums collected	(16.9)		(17.3)
Foreign currency	(0.1)		(49.5)
Ending balance at original discount rate	260.7		216.3
Effect of change in discount rate assumptions	(37.6)		(46.9)
Balance, end of period	$	223.1	$	169.4
Present Value of Expected Future Policy Benefits
Balance, beginning of year	$	2,231.4	$	3,181.8
Beginning balance at original discount rate	2,495.5		2,703.8
Effect of changes in cash flow assumptions	17.7		(20.1)
Effect of actual variances from expected experience	(9.2)		23.5
Adjusted beginning of year balance	2,504.0		2,707.2
Issuances1	277.3		287.9
Interest accretion	47.7		50.0
Benefit payments	(307.5)		(270.3)
Foreign currency	19.6		(485.7)
Ending balance at original discount rate	2,541.1		2,289.1
Effect of change in discount rate assumptions	(297.1)		(345.4)
Balance, end of period	$	2,244.0	$	1,943.7
Net liability for future policy benefits	$	2,020.9	$	1,774.3
Other	30.3		24.9
Total liability for future policy benefits	2,051.2		1,799.2
Less: Reinsurance recoverable related to future policy benefits	69.4		57.8
Net liability for future policy benefits, after reinsurance recoverable	$	1,981.8	$	1,741.4
1Issuances for Unum International primarily represents new claim incurrals.

The following tables summarize the amount of gross premiums and interest accretion reflected in the statements of income as well as the undiscounted and discounted expected gross premiums and expected future benefit payments and the weighted average interest rates for traditional long duration products in the Unum International segment presented in the rollforward activity above.

	Nine Months Ended September 30
	2023		2022
	(in millions of dollars)
Amount recognized in the statement of income:
Gross premiums or assessments	$	667.7	$	590.4
Interest accretion	$	40.8	$	43.5

	September 30
	2023			2022
	(in millions of dollars, except weighted average data)
Amount of undiscounted:
Expected future benefit payments	$	4,012.8		$	3,642.0
Expected future gross premiums	$	1,035.7		$	814.9
Amount of discounted (at interest accretion rate):
Expected future gross premiums	$	676.8		$	545.1
Weighted average interest rate:
Interest accretion rate	4.0		%	3.9		%
Current discount rate	5.4		%	5.9		%
Weighted average duration of the liability	8.6 years			8.5 years

Colonial Life Segment

The following table presents the balances and changes in the reserves for future policy benefits for traditional long duration products in the Colonial Life segment.

	September 30
	2023		2022
	(in millions of dollars)
Present Value of Expected Net Premiums
Balance, beginning of year	$	3,745.4	$	4,597.0
Beginning balance at original discount rate	4,046.4		4,158.9
Effect of changes in cash flow assumptions	(322.7)		(32.3)
Effect of actual variances from expected experience	(77.1)		(105.8)
Adjusted beginning of year balance	3,646.6		4,020.8
Issuances	421.7		464.3
Interest accretion	94.3		99.4
Net premiums collected	(454.0)		(483.6)
Ending balance at original discount rate	3,708.6		4,100.9
Effect of change in discount rate assumptions	(348.7)		(353.2)
Balance, end of period	$	3,359.9	$	3,747.7
Present Value of Expected Future Policy Benefits
Balance, beginning of year	$	5,581.1	$	7,054.8
Beginning balance at original discount rate	6,163.9		6,201.5
Effect of changes in cash flow assumptions	(402.9)		(85.9)
Effect of actual variances from expected experience	(90.1)		(133.4)
Adjusted beginning of year balance	5,670.9		5,982.2
Issuances	461.1		502.9
Interest accretion	161.0		165.1
Benefit payments	(462.1)		(467.4)
Ending balance at original discount rate	5,830.9		6,182.8
Effect of change in discount rate assumptions	(731.9)		(667.5)
Balance, end of period	$	5,099.0	$	5,515.3
Net liability for future policy benefits	$	1,739.1	$	1,767.6
Other	24.3		23.9
Total liability for future policy benefits	1,763.4		1,791.5
Less: Reinsurance recoverable related to future policy benefits	0.9		1.3
Net liability for future policy benefits, after reinsurance recoverable	$	1,762.5	$	1,790.2

The following tables summarize the amount of gross premiums and interest accretion reflected in the statements of income as well as the undiscounted and discounted expected gross premiums and expected future benefit payments and the weighted average interest rates for traditional long duration products in the Colonial Life segment presented in the rollforward activity above.

	Nine Months Ended September 30
	2023		2022
	(in millions of dollars)
Amount recognized in the statement of income:
Gross premiums or assessments	$	1,240.3	$	1,228.3
Interest accretion	$	66.7	$	65.7

	September 30
	2023			2022
	(in millions of dollars, except weighted average data)
Amount of undiscounted:
Expected future benefit payments	$	9,568.2		$	9,984.0
Expected future gross premiums	$	11,847.5		$	12,205.8
Amount of discounted (at interest accretion rate):
Expected future gross premiums	$	8,684.1		$	8,996.4
Weighted average interest rate:
Interest accretion rate	4.3		%	4.4		%
Current discount rate	5.7		%	5.3		%
Weighted average duration of the liability	16.9 years			17.9 years

Closed Block Segment

The following table presents the balances and changes in the reserves for future policy benefits for traditional long duration products in the Closed Block segment.

	September 30, 2023
	Long-term Care		All Other		Total Closed Block
	(in millions of dollars)
Present Value of Expected Net Premiums
Balance, beginning of year	$	6,412.6	$	—	$	6,412.6
Beginning balance at original discount rate	6,236.1		—		6,236.1
Effect of changes in cash flow assumptions	1,641.3		—		1,641.3
Effect of actual variances from expected experience	54.9		—		54.9
Adjusted beginning of year balance	7,932.3		—		7,932.3
Interest accretion	271.9		—		271.9
Net premiums collected	(438.1)		—		(438.1)
Ending balance at original discount rate	7,766.1		—		7,766.1
Effect of change in discount rate assumptions	(141.1)		—		(141.1)
Balance, end of period	$	7,625.0	$	—	$	7,625.0
Present Value of Expected Future Policy Benefits
Balance, beginning of year	$	21,199.9	$	8,218.8	$	29,418.7
Beginning balance at original discount rate	20,221.6		8,630.7		28,852.3
Effect of changes in cash flow assumptions	2,009.4		—		2,009.4
Effect of actual variances from expected experience	106.7		4.1		110.8
Adjusted beginning of year balance	22,337.7		8,634.8		30,972.5
Issuances1	—		101.2		101.2
Interest accretion	850.7		270.0		1,120.7
Benefit payments	(624.2)		(776.0)		(1,400.2)
Ending balance at original discount rate	22,564.2		8,230.0		30,794.2
Effect of change in discount rate assumptions	(579.3)		(687.0)		(1,266.3)
Balance, end of period	$	21,984.9	$	7,543.0	$	29,527.9
Net liability for future policy benefits	$	14,359.9	$	7,543.0	21,902.9
Other2	12.8		1,606.0		1,618.8
Total liability for future policy benefits	14,372.7		9,149.0		23,521.7
Less: Reinsurance recoverable related to future policy benefits	4.6		7,173.7		7,178.3
Net liability for future policy benefits, after reinsurance recoverable	$	14,368.1	$	1,975.3	$	16,343.4
1Issuances for Closed Block - All Other represents new claim incurrals.
2Other for Closed Block - All Other primarily includes our closed block group pension products and certain of our ceded closed block individual life products.

	September 30, 2022
	Long-term Care		All Other		Total Closed Block
	(in millions of dollars)
Present Value of Expected Net Premiums
Balance, beginning of year	$	8,404.7	$	—	$	8,404.7
Beginning balance at original discount rate	6,457.3		—		6,457.3
Effect of changes in cash flow assumptions	27.8		—		27.8
Effect of actual variances from expected experience	(34.8)		—		(34.8)
Adjusted beginning of year balance	6,450.3		—		6,450.3
Interest accretion	263.6		—		263.6
Net premiums collected	(424.1)		—		(424.1)
Ending balance at original discount rate	6,289.8		—		6,289.8
Effect of change in discount rate assumptions	98.2		—		98.2
Balance, end of period	$	6,388.0	$	—	$	6,388.0
Present Value of Expected Future Policy Benefits
Balance, beginning of year	$	30,089.6	$	10,414.4	$	40,504.0
Beginning balance at original discount rate	19,870.8		8,949.4		28,820.2
Effect of changes in cash flow assumptions	24.9		216.9		241.8
Effect of actual variances from expected experience	(39.3)		18.1		(21.2)
Adjusted beginning of year balance	19,856.4		9,184.4		29,040.8
Issuances1	—		123.9		123.9
Interest accretion	829.7		281.4		1,111.1
Benefit payments	(548.7)		(832.6)		(1,381.3)
Ending balance at original discount rate	20,137.4		8,757.1		28,894.5
Effect of change in discount rate assumptions	629.6		(521.2)		108.4
Balance, end of period	$	20,767.0	$	8,235.9	$	29,002.9
Net liability for future policy benefits	$	14,379.0	$	8,235.9	$	22,614.9
Other2	22.8		1,759.9		1,782.7
Total liability for future policy benefits	14,401.8		9,995.8		24,397.6
Less: Reinsurance recoverable related to future policy benefits	5.3		7,834.2		7,839.5
Net liability for future policy benefits, after reinsurance recoverable	$	14,396.5	$	2,161.6	$	16,558.1
1Issuances for Closed Block - All Other represents new claim incurrals.
2Other for Closed Block - All Other primarily includes our closed block group pension products and certain of our ceded closed block individual life products.

The following tables summarize the amount of gross premiums and interest accretion reflected in the statements of income as well as the undiscounted and discounted expected gross premiums and expected future benefit payments and the weighted average interest rates for traditional long duration products in the Closed Block segment presented in the rollforward activity above.

	Nine Months Ended September 30, 2023
	Long-term Care		All Other		Total Closed Block
	(in millions of dollars)
Amount recognized in the statement of income:
Gross premiums or assessments	$	521.2	$	169.3	$	690.5
Interest accretion	$	578.8	$	270.0	$	848.8

	Nine Months Ended September 30, 2022
	Long-term Care		All Other		Total Closed Block
	(in millions of dollars)
Amount recognized in the statement of income:
Gross premiums or assessments	$	523.0	$	192.6	$	715.6
Interest accretion	$	566.1	$	281.4	$	847.5

	September 30, 2023
	Long-term Care			All Other			Total Closed Block
	(in millions of dollars, except weighted average data)
Amount of undiscounted:
Expected future benefit payments	$	61,672.0		$	12,109.6		$	73,781.6
Expected future gross premiums	$	14,678.9		$	—		$	14,678.9
Amount of discounted (at interest accretion rate):
Expected future gross premiums	$	8,311.0		$	—		$	8,311.0
Weighted average interest rate:
Interest accretion rate	5.6		%	4.6		%	5.2		%
Current discount rate	5.8%			5.7		%	5.8		%
Weighted average duration of the liability	16.6 years			7.3 years			13.3 years

	September 30, 2022
	Long-term Care			All Other			Total Closed Block
	(in millions of dollars, except weighted average data)
Amount of undiscounted:
Expected future benefit payments	$	52,756.7		$	12,950.4		$	65,707.1
Expected future gross premiums	$	12,812.7		$	—		$	12,812.7
Amount of discounted (at interest accretion rate):
Expected future gross premiums	$	7,408.0		$	—		$	7,408.0
Weighted average interest rate:
Interest accretion rate	5.5		%	4.6		%	5.2%
Current discount rate	5.3		%	5.3		%	5.3%
Weighted average duration of the liability	15.7 years			7.4 years			12.5 years

Reconciliation

A reconciliation of the liability for future policy benefits reflected in the preceding rollforwards to the related liability balances in the consolidated balance sheets are as follows:

	September 30
	2023		2022
	(in millions of dollars)
Liability for future policy benefits
Unum US1	$	8,930.0	$	9,601.9
Unum International	2,051.2		1,799.2
Colonial Life	1,763.4		1,791.5
Closed Block1	23,521.7		24,397.6
Other products1	236.1		217.8
Total liability for future policy benefits	$	36,502.4	$	37,808.0

1Unum US excludes dental & vision and medical stop-loss product lines and Closed Block excludes our participating fund account, which represents policies issued by one of our subsidiaries prior to its 1986 conversion from a mutual stock life insurance company. The liabilities associated with these products are included within Other products.

Policyholders' account balances primarily include our universal life and corporate-owned life insurance products. Policyholders' account balances reflect customer deposits and interest credited less cost of insurance, administration expenses, surrender charges, and customer withdrawals. Our unearned revenue reserve, claim reserves and certain other reserves related to our universal life products and corporate-owned life insurance products are also reported as a component of policyholders’ account balances. Policyholders' account balances require loss recognition testing. We perform loss recognition tests on these reserves annually, or more frequently if appropriate, using best estimate assumptions as of the date of the test, without a provision for adverse deviation. We group the policy reserves for each major product line within a reporting segment when we perform the loss recognition tests. If the policy reserves determined using these best estimate assumptions are higher than our existing policy reserves net of any deferred acquisition cost balance, the existing policy reserves are increased or deferred acquisition costs are reduced to immediately recognize the deficiency. This becomes the new basis for reserves going forward, subject to future loss recognition testing. Anticipated investment income, based on our anticipated portfolio yield rates after consideration for defaults and investment expenses, is considered when performing loss recognition testing for long-duration contracts.

The following table presents the balances and changes in the policyholders' account balances:

	September 30, 2023
	Unum US - Voluntary Benefits		Colonial Life		Closed Block - All Other		Total
	(in millions of dollars, except weighted average data)
Balance, beginning of year	$	586.8	$	852.4	$	4,159.4	$	5,598.6
Premiums received	44.9		64.4		25.2		134.5
Policy charges1	(45.8)		(56.3)		(78.9)		(181.0)
Surrenders and withdrawals	(23.6)		(28.5)		(12.1)		(64.2)
Benefit payments	(7.5)		(5.6)		(191.0)		(204.1)
Interest credited	17.0		25.7		239.0		281.7
Other	6.7		(0.2)		24.3		30.8
Balance, end of period	578.5		851.9		4,165.9		5,596.3
Reserves in excess of account balance	99.2		16.6		32.4		148.2
Total policyholders' account balances	677.7		868.5		4,198.3		5,744.5
Less: Reinsurance recoverable related to policyholders' account balances	1.0		—		4,198.3		4,199.3
Net policyholders' account balances, after reinsurance recoverable	$	676.7	$	868.5	$	—	$	1,545.2
Weighted average crediting rate	4.0%		4.1%		8.0%		6.9%
Net amount at risk2	$	4,600.0	$	8,901.6	$	1,807.1	$	15,308.7
Cash surrender value	$	568.9	$	810.1	$	4,033.4	$	5,412.4
1Contracts included in the policyholder account balances are generally charged a premium and/or monthly assessments on the basis of the account balance.
2For those guarantees of benefits that are payable in the event of death, the net amount at risk is generally defined as the current guaranteed minimum death benefit in excess of the current account balance at the balance sheet date.

	September 30, 2022
	Unum US - Voluntary Benefits		Colonial Life		Closed Block - All Other		Total
	(in millions of dollars, except weighted average data)
Balance, beginning of year	$	598.7	$	849.2	$	4,231.7	$	5,679.6
Premiums received	49.2		68.8		25.1		143.1
Policy charges1	(48.8)		(58.9)		(77.0)		(184.7)
Surrenders and withdrawals	(25.6)		(27.9)		(18.7)		(72.2)
Benefit payments	(8.0)		(6.0)		(189.3)		(203.3)
Interest credited	17.8		25.6		232.9		276.3
Other	5.8		0.1		30.2		36.1
Balance, end of period	589.1		850.9		4,234.9		5,674.9
Reserves in excess of account balance	89.4		17.5		31.0		137.9
Total policyholders' account balances	678.5		868.4		4,265.9		5,812.8
Less: Reinsurance recoverable related to policyholders' account balances	1.0		0.1		4,265.9		4,267.0
Net policyholders' account balances, after reinsurance recoverable	$	677.5	$	868.3	$	—	$	1,545.8
Weighted average crediting rate	4.1%		4.1%		7.6%		6.7%
Net amount at risk2	$	5,008.7	$	9,490.5	$	1,920.1	$	16,419.3
Cash surrender value	$	585.4	$	796.8	$	4,093.2	$	5,475.4
1Contracts included in the policyholder account balances are generally charged a premium and/or monthly assessments on the basis of the account balance.
2For those guarantees of benefits that are payable in the event of death, the net amount at risk is generally defined as the current guaranteed minimum death benefit in excess of the current account balance at the balance sheet date.

The balance of the account values by range of guaranteed minimum crediting rates and the related range of difference, in basis points, between rates being credited to policyholders and the respective guaranteed minimums is as follows.

	September 30, 2023
Range of Guaranteed Minimum Crediting Rate	At Guaranteed Minimum		1 Basis Point - 50 Basis Points Above		51 Basis Points - 150 Basis Points Above		Greater than 150 Basis Points Above		Total
	(in millions of dollars)
	Unum US - Voluntary Benefits
3.00% - 3.99%	$	91.6	$	—	$	—	$	—	$	91.6
4.00% - 4.99%	265.4		188.5		—		—		453.9
5.00% - 6.00%	33.0		—		—		—		33.0
	390.0		188.5		—		—		578.5
	Colonial Life
4.00% - 5.00%	845.8		6.1		—		—		851.9
	Closed Block - All Other
3.00% - 5.99%	431.3		1,181.2		27.1		—		1,639.6
6.00% - 8.99%	2.1		28.5		—		—		30.6
9.00% - 11.99%	398.4		1,914.7		—		—		2,313.1
12.00% - 15.00%	—		182.6		—		—		182.6
	831.8		3,307.0		27.1		—		4,165.9
Total	$	2,067.6	$	3,501.6	$	27.1	$	—	$	5,596.3

	September 30, 2022
Range of Guaranteed Minimum Crediting Rate	At Guaranteed Minimum		1 Basis Point - 50 Basis Points Above		51 Basis Points - 150 Basis Points Above		Greater than 150 Basis Points Above		Total
	(in millions of dollars)
	Unum US - Voluntary Benefits
3.00% - 3.99%	$	95.3	$	—	$	—	$	—	$	95.3
4.00% - 4.99%	277.4		182.2		—		—		459.6
5.00% - 6.00%	34.2		—		—		—		34.2
	406.9		182.2		—		—		589.1
	Colonial Life
4.00% - 5.00%	845.0		5.9		—		—		850.9
	Closed Block - All Other
3.00% - 5.99%	1,708.4		29.1		6.6		—		1,744.1
6.00% - 8.99%	30.5		—		—		—		30.5
9.00% - 11.99%	2,289.6		—		—		—		2,289.6
12.00% - 15.00%	170.7		—		—		—		170.7
	4,199.2		29.1		6.6		—		4,234.9
Total	$	5,451.1	$	217.2	$	6.6	$	—	$	5,674.9

Deferred Policy Acquisition Costs by Segment

Note 9 - Deferred Acquisition Costs

DAC represents the deferred incremental direct costs associated with the successful acquisition of new or renewal insurance contracts. Such costs include commissions, other agency compensation, certain selection and policy issue expenses, and certain field expenses. Acquisition costs that do not vary with the production of new business, such as commissions on group products which are generally level throughout the life of the policy, are excluded from the deferral.

Our insurance contracts are grouped by product type and contract issue year into cohorts consistent with the grouping used to estimate the related contract liabilities. DAC is amortized on a constant level basis over the life of the policy. For all products, in-force volume metrics are used as the constant level basis. The lapse and mortality assumptions used to amortize DAC for our traditional long-duration products are consistent with the assumptions used to estimate the liability for future policy benefits. The underlying assumptions used to determine DAC amortization are updated concurrently with any related assumption changes for the liability for future policy benefits and changes in estimates are recognized prospectively over the remaining expected term of the related contracts. Amortization expense is adjusted based on actual versus expected experience through an adjustment to the prospective rate of amortization.

For certain products, policyholders can elect to modify product benefits, features, rights, or coverages by exchanging a contract for a new contract or by amendment, endorsement, or rider to a contract, or by the election of a feature or coverage within a contract. These transactions are known as internal replacement transactions, principally on group contracts. Internal replacement transactions wherein the modification does not substantially change the policy are accounted for as continuations of the replaced contracts. The original policy continues to be reflected as an in force policy within its original cohort. The policy's expected life then impacts the amortization of remaining unamortized deferred acquisition costs within its cohort. The costs of replacing the policy are accounted for as policy maintenance costs and expensed as incurred. Internal replacement transactions that result in a policy that is substantially changed are accounted for as an extinguishment of the original policy and the issuance of a new policy. The original policy that was replaced is terminated from its original cohort and this termination is

reflected in the amortization rate of remaining unamortized deferred acquisition costs for the cohort. The costs of acquiring the new policy are capitalized and amortized as part of a new cohort.

During the third quarter of 2023, we updated our policyholder lapse and mortality assumptions used to develop the future amortization for DAC for the Unum US voluntary benefits product line and the Colonial Life segment. During the third quarter of 2022, we updated our policyholder lapse and mortality assumptions used to develop the future amortization for DAC for the Unum US individual disability and voluntary benefits product lines as well as for the Colonial Life segment. These assumption updates were consistent with the related assumption updates for the liability for future policy benefits.

The following tables display the changes in DAC throughout the period:

	September 30, 2023
	Unum US		Unum International		Colonial Life		Total
	(in millions of dollars)
Balance, beginning of year	$	1,185.1	$	37.0	$	1,337.9	$	2,560.0
Capitalization	230.6		10.8		226.1		467.5
Amortization expense	(199.2)		(6.1)		(153.4)		(358.7)
Foreign currency	—		(0.1)		—		(0.1)
Balance, end of period	$	1,216.5	$	41.6	$	1,410.6	$	2,668.7

	September 30, 2022
	Unum US		Unum International		Colonial Life		Total
	(in millions of dollars)
Balance, beginning of year	$	1,152.9	$	36.4	$	1,238.1	$	2,427.4
Capitalization	199.4		9.3		210.4		419.1
Amortization expense	(178.5)		(6.1)		(128.4)		(313.0)
Foreign currency	—		(7.0)		—		(7.0)
Balance, end of period	$	1,173.8	$	32.6	$	1,320.1	$	2,526.5

	September 30, 2023
	Group Disability		Group Life and AD&D		Voluntary Benefits		Individual Disability		Dental and Vision		Total Unum US
	(in millions of dollars)
Balance, beginning of year	$	61.0	$	49.3	$	601.0	$	464.4	$	9.4	$	1,185.1
Capitalization	44.7		28.9		85.2		62.6		9.2		230.6
Amortization expense	(42.1)		(29.5)		(79.5)		(40.2)		(7.9)		(199.2)
Balance, end of period	$	63.6	$	48.7	$	606.7	$	486.8	$	10.7	$	1,216.5

	September 30, 2022
	Group Disability		Group Life and AD&D		Voluntary Benefits		Individual Disability		Dental and Vision		Total Unum US
	(in millions of dollars)
Balance, beginning of year	$	60.9	$	53.9	$	588.6	$	441.8	$	7.7	$	1,152.9
Capitalization	38.1		26.9		76.0		50.9		7.5		199.4
Amortization expense	(38.0)		(30.5)		(66.6)		(36.8)		(6.6)		(178.5)
Balance, end of period	$	61.0	$	50.3	$	598.0	$	455.9	$	8.6	$	1,173.8

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Segment Information

9 Months Ended

Sep. 30, 2023

Segment Reporting [Abstract]

Segment Information

We have three principal operating business segments: Unum US, Unum International, and Colonial Life. Our other segments are Closed Block and Corporate.

Segment information is shown below. Certain prior year amounts were reclassified to conform to current year presentation.

	Three Months Ended September 30				Nine Months Ended September 30
	2023		2022		2023		2022
	(in millions of dollars)
Premium Income
Unum US
Group Disability
Group Long-term Disability	$	518.5	$	480.9	$	1,539.3	$	1,419.2
Group Short-term Disability	256.5		232.2		753.0		685.9
Group Life and Accidental Death & Dismemberment
Group Life	423.0		417.7		1,254.3		1,249.9
Accidental Death & Dismemberment	44.1		43.8		131.2		129.7
Supplemental and Voluntary
Voluntary Benefits	209.5		196.2		637.4		629.2
Individual Disability	136.7		118.9		386.7		350.3
Dental and Vision	69.4		67.1		206.8		206.6
	1,657.7		1,556.8		4,908.7		4,670.8
Unum International
Unum UK
Group Long-term Disability	101.1		89.8		297.5		287.5
Group Life	44.2		35.0		124.5		100.5
Supplemental	34.6		27.4		99.9		85.8
Unum Poland	30.7		21.1		85.2		66.7
	210.6		173.3		607.1		540.5
Colonial Life
Accident, Sickness, and Disability	236.7		236.1		708.0		714.0
Life	106.2		100.2		318.1		303.2
Cancer and Critical Illness	88.3		87.0		265.2		264.4
	431.2		423.3		1,291.3		1,281.6
Closed Block
Long-term Care	172.1		174.5		521.2		523.0
All Other	54.3		61.0		166.0		190.4
	226.4		235.5		687.2		713.4
Total Premium Income	$	2,525.9	$	2,388.9	$	7,494.3	$	7,206.3

	Unum US		Unum International		Colonial Life		Closed Block		Corporate		Total
	(in millions of dollars)
Three Months Ended September 30, 2023
Premium Income	$	1,657.7	$	210.6	$	431.2	$	226.4	$	—	$	2,525.9
Net Investment Income	166.2		27.3		39.3		274.9		18.3		526.0
Other Income	58.0		0.5		0.3		12.8		—		71.6
Adjusted Operating Revenue	$	1,881.9	$	238.4	$	470.8	$	514.1	$	18.3	$	3,123.5
Adjusted Operating Income (Loss)	$	357.8	$	36.8	$	102.9	$	34.2	$	(41.5)	$	490.2
Three Months Ended September 30, 2022
Premium Income	$	1,556.8	$	173.3	$	423.3	$	235.5	$	—	$	2,388.9
Net Investment Income	170.6		37.0		38.6		251.4		14.0		511.6
Other Income	49.0		0.2		0.3		13.1		0.4		63.0
Adjusted Operating Revenue	$	1,776.4	$	210.5	$	462.2	$	500.0	$	14.4	$	2,963.5
Adjusted Operating Income (Loss)	$	280.8	$	24.9	$	117.9	$	42.1	$	(49.5)	$	416.2

	Unum US		Unum International		Colonial Life		Closed Block		Corporate		Total
	(in millions of dollars)
Nine Months Ended September 30, 2023
Premium Income	$	4,908.7	$	607.1	$	1,291.3	$	687.2	$	—	$	7,494.3
Net Investment Income	481.5		104.0		114.6		796.0		69.8		1,565.9
Other Income	166.1		1.0		0.9		40.1		2.5		210.6
Adjusted Operating Revenue	$	5,556.3	$	712.1	$	1,406.8	$	1,523.3	$	72.3	$	9,270.8
Adjusted Operating Income (Loss)	$	1,013.4	$	118.7	$	312.3	$	143.6	$	(109.9)	$	1,478.1
Nine Months Ended September 30, 2022
Premium Income	$	4,670.8	$	540.5	$	1,281.6	$	713.4	$	—	$	7,206.3
Net Investment Income	509.4		122.3		115.4		817.7		33.0		1,597.8
Other Income	146.8		0.7		0.8		45.6		3.6		197.5
Adjusted Operating Revenue	$	5,327.0	$	663.5	$	1,397.8	$	1,576.7	$	36.6	$	9,001.6
Adjusted Operating Income (Loss)	$	741.0	$	78.9	$	317.4	$	207.6	$	(126.8)	$	1,218.1

	September 30		December 31
	2023		2022
	(in millions of dollars)
Assets
Unum US	$	15,088.5	$	16,356.3
Unum International	3,165.9		3,129.4
Colonial Life	4,608.6		4,575.0
Closed Block	33,070.4		33,776.6
Corporate	4,021.1		3,311.2
Total Assets	$	59,954.5	$	61,148.5

We measure and analyze our segment performance on the basis of "adjusted operating revenue" and "adjusted operating income" or "adjusted operating loss", which differ from total revenue and income before income tax as presented in our consolidated statements of income due to the exclusion of investment gains or losses, the amortization of the cost of reinsurance, the impact of non-contemporaneous reinsurance, and reserve assumption updates as specified in the reconciliations below. We believe adjusted operating revenue and adjusted operating income or loss are better performance measures and better indicators of the revenue and profitability and underlying trends in our business. These performance measures are in accordance with GAAP guidance for segment reporting, but they should not be viewed as a substitute for total revenue, income before income tax, net income, or net loss. 

Investment gains or losses primarily include realized investment gains or losses, expected investment credit losses, and gains or losses on derivatives. Investment gains or losses depend on market conditions and do not necessarily relate to decisions regarding the underlying business of our segments. Our investment focus is on investment income to support our insurance liabilities as opposed to the generation of investment gains or losses. Although we may experience investment gains or losses which will affect future earnings levels, a long-term focus is necessary to maintain profitability over the life of the business since our underlying business is long-term in nature, and we need to earn the interest rates assumed in calculating our liabilities.

Cash flow assumptions used to calculate our liability for future policy benefits are reviewed at least annually and updated, as needed, with the resulting impact reflected in net income. While the effects of these assumption updates are recorded in the reporting period in which the review is completed, these updates reflect experience emergence and changes to expectations spanning multiple periods. We believe that by excluding the impact of reserve assumption updates we are providing a more comparable and consistent view of our quarterly results.

We exited a substantial portion of our Closed Block individual disability product line through the two phases of the reinsurance transaction that were executed in December 2020 and March 2021. As a result, we exclude the amortization of the cost of reinsurance that we recognized upon the exit of the business related to the policies on claim status as well as the impact of non-contemporaneous reinsurance that resulted from the adoption of ASU 2018-12. Due to the execution of the second phase of the reinsurance transaction occurring after January 1, 2021, the transition date of ASU 2018-12, in accordance with the provisions of the ASU related to non-contemporaneous reinsurance, we were required to establish the ceded reserves using an upper-medium grade fixed-income instrument as of the reinsurance transaction date in March 2021 which resulted in higher ceded reserves compared to that which was reported historically. However, the direct reserves for the block reinsured in the second phase were calculated using the original discount rate utilized as of the transition date. Both the direct and ceded reserves are then remeasured at each reporting period using a current discount rate reflective of an upper-medium grade fixed-income instrument, with the changes recognized in OCI. While the total equity impact is neutral, the different original discount rates utilized for direct and ceded reserves result in disproportionate earnings impacts. The impact of non-contemporaneous reinsurance will fluctuate depending on the magnitude of reserve changes during the period. We believe that the exclusion of these items provides a better view of our results from our ongoing businesses.

We may at other times exclude certain other items from our discussion of financial ratios and metrics in order to enhance the understanding and comparability of our operational performance and the underlying fundamentals, but this exclusion is not an indication that similar items may not recur and does not replace net income or net loss as a measure of our overall profitability.

A reconciliation of total revenue to "adjusted operating revenue" and income before income tax to "adjusted operating income" is as follows:

	Three Months Ended September 30				Nine Months Ended September 30
	2023		2022		2023		2022
	(in millions of dollars)
Total Revenue	$	3,092.5	$	2,959.1	$	9,240.8	$	8,979.3
Excluding:
Net Investment Loss	(31.0)		(4.4)		(30.0)		(22.3)
Adjusted Operating Revenue	$	3,123.5	$	2,963.5	$	9,270.8	$	9,001.6
Income Before Income Tax	$	261.7	$	641.6	$	1,211.4	$	1,376.5
Excluding:
Net Investment Loss	(31.0)		(4.4)		(30.0)		(22.3)
Amortization of the Cost of Reinsurance	(11.1)		(11.8)		(33.1)		(38.5)
Non-Contemporaneous Reinsurance	(9.2)		(1.7)		(26.4)		(24.1)
Reserve Assumption Updates	(177.2)		243.3		(177.2)		243.3
Adjusted Operating Income	$	490.2	$	416.2	$	1,478.1	$	1,218.1

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Employee Benefit Plans

9 Months Ended

Sep. 30, 2023

Retirement Benefits [Abstract]

Pension and Other Postretirement Benefits Disclosure

Defined Benefit Pension and Other Postretirement Benefit (OPEB) Plans

We sponsor several defined benefit pension and OPEB plans for our employees, including non-qualified pension plans. The U.S. qualified and non-qualified defined benefit pension plans comprise the majority of our total benefit obligation and benefit cost. We maintain a separate defined benefit plan for eligible employees in our U.K. operation. The U.S. defined benefit pension plans were closed to new entrants on December 31, 2013, the OPEB plan was closed to new entrants on December 31, 2012, and the U.K. plan was closed to new entrants on December 31, 2002.

The following table provides the components of the net periodic benefit cost (credit) for the defined benefit pension and OPEB plans.

	Three Months Ended September 30
	Pension Benefits
	U.S. Plans				U.K. Plan				OPEB
	2023		2022		2023		2022		2023		2022
	(in millions of dollars)
Service Cost	$	2.3	$	1.9	$	—	$	—	$	—	$	—
Interest Cost	22.0		16.8		1.9		1.2		1.1		0.8
Expected Return on Plan Assets	(23.0)		(26.5)		(2.1)		(2.6)		(0.2)		(0.2)
Amortization of:
Net Actuarial (Gain) Loss	3.8		4.1		0.6		0.1		(2.6)		(0.2)
Prior Service Credit	—		—		—		—		—		(0.1)
Total Net Periodic Benefit Cost (Credit)	$	5.1	$	(3.7)	$	0.4	$	(1.3)	$	(1.7)	$	0.3

	Nine Months Ended September 30
	Pension Benefits
	U.S. Plans				U.K. Plan				OPEB
	2023		2022		2023		2022		2023		2022
	(in millions of dollars)
Service Cost	$	6.9	$	5.8	$	—	$	—	$	—	$	—
Interest Cost	66.0		50.4		5.7		3.8		3.4		2.3
Expected Return on Plan Assets	(69.1)		(79.5)		(6.3)		(8.3)		(0.4)		(0.4)
Amortization of:
Net Actuarial (Gain) Loss	11.4		12.2		1.9		0.3		(7.9)		(0.7)
Prior Service Credit	—		—		—		—		(0.1)		(0.2)
Total Net Periodic Benefit Cost (Credit)	$	15.2	$	(11.1)	$	1.3	$	(4.2)	$	(5.0)	$	1.0

The service cost component of net periodic pension and postretirement benefit cost (credit) is included as a component of compensation expense in our consolidated statements of income. All other components of net periodic pension and postretirement benefit cost (credit) are included in other expenses.

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Stockholders' Equity and Earnings Per Common Share

9 Months Ended

Sep. 30, 2023

Stockholders' Equity and Earnings Per Common Share [Abstract]

Earnings Per Share Disclosure

Earnings Per Common Share

Net income per common share is determined as follows:

	Three Months Ended September 30				Nine Months Ended September 30
	2023		2022		2023		2022
	(in millions of dollars, except share data)
Numerator
Net Income	$	202.0	$	510.3	$	953.2	$	1,118.0
Denominator (000s)
Weighted Average Common Shares - Basic	196,083.2		200,035.3		197,289.5		201,262.3
Dilution for Assumed Exercises of Nonvested Stock Awards	1,048.6		1,614.9		1,005.6		1,256.7
Weighted Average Common Shares - Assuming Dilution	197,131.8		201,650.2		198,295.1		202,519.0
Net Income Per Common Share
Basic	$	1.03	$	2.55	$	4.83	$	5.55
Assuming Dilution	$	1.02	$	2.53	$	4.81	$	5.52

We compute basic earnings per share by dividing net income by the weighted average number of common shares outstanding for the period. In computing earnings per share assuming dilution, we include potential common shares that are dilutive (those that reduce earnings per share). We use the treasury stock method to account for the effect of nonvested stock success units, nonvested restricted stock units, and nonvested performance share units on the computation of diluted earnings per share. Under this method, the potential common shares from nonvested stock success units and nonvested restricted stock units will each have a dilutive effect, as individually measured, when the average market price of Unum Group common stock during the period exceeds the grant price of the nonvested stock success units and nonvested restricted stock units. The outstanding nonvested stock success units and nonvested restricted stock units have grant prices ranging from $18.78 to $49.29. Potential common shares from performance based share units will have a dilutive effect as the attainment of performance conditions is progressively achieved during the vesting period. Potential common shares not included in the computation of diluted earnings per share because the impact would be antidilutive approximated a de minimis amount and 0.4 million potential common shares for the three and nine months ended September 30, 2023, respectively. There were a de minimis amount and 0.1 million potential common shares that were antidilutive for the three and nine months ended September 30, 2022, respectively.

Stockholders' Equity Disclosure

Common Stock

As part of our capital deployment strategy, we may repurchase shares of Unum Group's common stock, as authorized by our board of directors. During December 2022, our board of directors authorized the repurchase of up to $200.0 million of Unum Group's outstanding common stock beginning January 1, 2023. In February 2023, our board of directors authorized an increase to the share repurchase program such that we are now authorized to repurchase up to $250.0 million of Unum Group's outstanding common stock. This share repurchase program has an expiration date of December 31, 2023, with the timing and amount of repurchase activity to be based on market conditions and other considerations, including the level of available cash, alternative uses for cash, and our stock price.

In October 2023, our board of directors authorized the repurchase of up to $500.0 million of Unum Group's outstanding common stock beginning on January 1, 2024. The repurchase program authorized in October 2023 has no scheduled termination date.

In August 2022, the Inflation Reduction Act was signed into law in the U.S. and, effective January 1, 2023, imposes a one percent excise tax on corporate stock repurchases after December 31, 2022. This excise tax is recorded as part of the cost basis of treasury stock and is assessed on the fair market value of stock repurchases reduced by the fair market value of any shares issued during the period.

Common stock repurchases, which are accounted for using the cost method and classified as treasury stock until otherwise retired, were as follows:

	Three Months Ended September 30				Nine Months Ended September 30
	2023		2022		2023		2022
	(in millions)
Shares Repurchased	1.5		1.2		3.9		4.2
Cost of Shares Repurchased1	$	74.8	$	42.6	$	175.4	$	137.5

1Includes a de minimis amount and $0.1 million of commissions for the three and nine months ended September 30, 2023, respectively, and a de minimis amount and $0.1 million of commissions for the three and nine months ended September 30, 2022, respectively. There was $0.7 million and $1.2 million of excise tax for the three and nine months ended September 30, 2023, respectively. There were no excise taxes during the three and nine months ended September 30, 2022.

As a part of our share repurchase program, we periodically enter into accelerated share repurchase agreements (ASR). Under the terms of these agreements, we make a prepayment to a financial counterparty for which we receive an initial delivery of approximately 75 percent of the total Unum Group common stock to be delivered under the agreement. We simultaneously enter into a forward contract indexed to the price of Unum Group common stock, which subjects the transactions to a future price adjustment. Under the terms of the agreements, we are to receive, or be required to pay, a price adjustment based on the volume weighted average price of Unum Group common stock during the term of the agreement, less a discount. Any price adjustment payable to us is settled in shares of Unum Group common stock. Any price adjustment we would be required to pay may be settled in either cash or common stock at our option. Details of our ASRs for the nine months ended September 30, 2023 and 2022 are as follows:

Prepayment Date	Prepayment Amount	Initial Share Delivery	Forward Contract Settlement Date	Shares Delivered to Settle Forward Contract
(in millions)
July 2023	$50.0	0.8	September 2023	0.2
February 2022	50.0	1.3	April 2022	0.4

As of September 30, 2023, the remaining repurchase amount under the current share repurchase program was $75.9 million.

Preferred Stock

Unum Group has 25.0 million shares of preferred stock authorized with a par value of $0.10 per share. No preferred stock has been issued to date.

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Commitments and Contingent Liabilities

9 Months Ended

Sep. 30, 2023

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies Disclosure

Commitments

See Notes 3 and 4 for further discussion on certain of our investment commitments.

Contingent Liabilities

We are a defendant in a number of litigation matters that have arisen in the normal course of business, including the matters discussed below. Further, state insurance regulatory authorities and other federal and state authorities regularly make inquiries and conduct investigations concerning our compliance with applicable insurance and other laws and regulations. Given the complexity and scope of our litigation and regulatory matters, it is not possible to predict the ultimate outcome of all pending investigations or legal proceedings or provide reasonable estimates of potential losses, except if noted in connection with specific matters.

In some of these matters, no specified amount is sought. In others, very large or indeterminate amounts, including punitive and treble damages, are asserted. There is a wide variation of pleading practice permitted in the United States courts with respect to requests for monetary damages, including some courts in which no specified amount is required and others which allow the plaintiff to state only that the amount sought is sufficient to invoke the jurisdiction of that court. Further, some jurisdictions permit plaintiffs to allege damages well in excess of reasonably possible verdicts. Based on our extensive experience and that of others in the industry with respect to litigating or resolving claims through settlement over an extended period of time, we believe that the monetary damages asserted in a lawsuit or claim bear little relation to the merits of the case, or the likely disposition value. Therefore, the specific monetary relief sought is not stated.

Unless indicated otherwise in the descriptions below, reserves have not been established for litigation and contingencies. An estimated loss is accrued when it is both probable that a liability has been incurred and the amount of the loss can be reasonably estimated.

Claim Handling Matters

We and our insurance subsidiaries, in the ordinary course of our business, are engaged in claim litigation where disputes arise as a result of a denial or termination of benefits. Most typically these lawsuits are filed on behalf of a single claimant or policyholder, and in some of these individual actions punitive damages are sought, such as claims alleging bad faith in the handling of insurance claims. For our general claim litigation, we maintain reserves based on experience to satisfy judgments and settlements in the normal course. We expect that the ultimate liability, if any, with respect to general claim litigation, after consideration of the reserves maintained, will not be material to our consolidated financial condition. Nevertheless, given the inherent unpredictability of litigation, it is possible that an adverse outcome in certain claim litigation involving punitive damages could, from time to time, have a material adverse effect on our consolidated results of operations in a period, depending on the results of operations for the particular period.

From time to time class action allegations are pursued where the claimant or policyholder purports to represent a larger number of individuals who are similarly situated. Since each insurance claim is evaluated based on its own merits, there is rarely a single act or series of actions which can properly be addressed by a class action. Nevertheless, we monitor these cases closely and defend ourselves appropriately where these allegations are made.

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Other

9 Months Ended

Sep. 30, 2023

Debt and Other Disclosures [Abstract]

Income Tax Disclosure

Income Tax

In August 2022, the Inflation Reduction Act (IRA) was signed into law in the U.S. and includes certain corporate tax provisions effective January 1, 2023. The IRA imposes a new 15 percent corporate alternative minimum tax (CAMT) on adjusted financial statement income (AFSI) on corporations that have average AFSI over $1.0 billion in any prior three-year period, starting with years 2020 to 2022. We anticipate that our company will be an applicable corporation. We have not recorded any CAMT as of September 30, 2023. We do not expect that any CAMT incurred would impact earnings since it would be offset with a credit toward regular income tax in subsequent years.

Allowance for Expected Credit Losses on Premiums Receivable

Allowance for Expected Credit Losses on Premiums Receivable

At September 30, 2023, June 30, 2023, and December 31, 2022, the allowance for expected credit losses on premiums receivable was $29.7 million, $28.7 million, and $32.5 million, respectively, on gross premiums receivable of $626.6 million, $660.3 million, and $557.6 million, respectively. The increase in the allowance of $1.0 million during the three months ended September 30, 2023, was driven primarily by an increase in premium due to be collected in the Unum US and Colonial segments. The decrease of $2.8 million during the nine months ended September 30, 2023, was driven primarily by improvements in the age of premiums receivable.

At September 30, 2022, June 30, 2022, and December 31, 2021, the allowance for expected credit losses on premiums receivable was $31.4 million, $34.3 million, and $34.2 million, respectively, on gross premiums receivable of $561.1 million, $593.4 million, and $530.7 million, respectively. The decrease in the allowance of $2.9 million and $2.8 million during the three and nine months ended September 30, 2022, respectively, was driven primarily by an improvement in the age of premiums due to be collected. Also contributing to the decline in the allowance during the three months ended September 30, 2022 was a decline in the gross receivable balance.

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Pay vs Performance Disclosure - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Pay vs Performance Disclosure
Net Income	$ 202.0	$ 510.3	$ 953.2	$ 1,118.0

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Insider Trading Arrangements	3 Months Ended
	Sep. 30, 2023
Trading Arrangements, by Individual
Material Terms of Trading Arrangement	On August 4, 2023, Elizabeth C. Ahmed, our EVP, People & Communications, adopted a Rule 10b5-1 trading arrangement intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). The trading arrangement provides for the sale of up to 5,000 shares of our common stock between November 6, 2023 and August 2, 2024.
Name	Elizabeth C. Ahmed
Title	EVP, People & Communications
Rule 10b5-1 Arrangement Adopted	true
Adoption Date	August 4, 2023
Arrangement Duration	271 days

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Basis of Presentation (Policies)	9 Months Ended
	Sep. 30, 2023
Accounting Policies [Abstract]
Basis of Presentation	The accompanying consolidated financial statements of Unum Group and its subsidiaries (the Company) have been prepared in accordance with U.S. generally accepted accounting principles (GAAP) for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by GAAP for complete financial statements. For further information, refer to the consolidated financial statements and footnotes included in our annual report on Form 10-K for the year ended December 31, 2022.

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Liability for Future Policy Benefits, Policyholder's Account Balances, and Deferred Acquisition Costs (Policies)

9 Months Ended

Sep. 30, 2023

Insurance [Abstract]

Liabilities for Future Policy Benefits

Liabilities for future policy benefits represent the cost of claims that we estimate we will eventually pay to our policyholders which includes policy liabilities for claims not yet incurred and for claims that have been incurred or are estimated to have been incurred but not yet reported to us. Liabilities for future policy benefits also include the related expenses for our non interest-sensitive life and accident and health products. The liability for future policy benefits is calculated based on the present value of the estimated future policy benefits less the present value of estimated future net premiums collected. Net premiums represent the portion of the gross premium required to provide for all benefits and expenses, excluding acquisition costs or any costs that are required to be charged to expense as incurred. In calculating the liability for future policy benefits, our long-duration contracts are grouped into cohorts by product type and contract issue year.

The calculation of the liability for future policy benefits involves numerous assumptions including assumptions related to discount rate, lapses, mortality, and morbidity. The discount rate assumptions were initially set based on the expected investment yield of the assets supporting the reserves at the transition date of ASU 2018-12, which was January 1, 2021, for policies originally issued on or before the transition date. The discount rate assumptions for new cohorts established after the transition date, are initially set based on the policy issuance date or policy renewal date, and are based on an upper-medium grade fixed-income instrument, which is generally equivalent to a single-A interest rate matched to the duration of our insurance liabilities. As cohorts are grouped by product type and issue year, a weighted average discount rate is utilized as policies are issued or renewed throughout the year. We utilize a reference portfolio of fixed-income instruments that have been A-rated by one of the major credit rating agencies. For products with liability cash flows that exceed the duration of observable single-A fixed income instruments, we use the last market observable yield and use extrapolation approaches to determine yield assumptions for durations beyond the last market observable duration. For the discount rate assumptions for products in our Unum International segment, we utilize observable market data in the local debt markets in the UK and Poland.

The initial, also referred to as the original, discount rate assumptions established for each cohort are used to determine interest accretion which is reported as a component of policy benefits on the statements of income. After policy issuance or policy renewal, the discount rate assumptions are updated quarterly and used to update the liability at each reporting date to the current discount rate, with the corresponding change reflected as the change in the effect of discount rate assumptions on the liability for future policy benefits, net of reinsurance, on the statement of changes in other comprehensive income (loss). The weighted average current discount rate was 5.6 percent at September 30, 2023 compared to 5.0 percent at December 31, 2022. The weighted average current discount rate was 5.2 percent at September 30, 2022 compared to 2.5 percent at December 31, 2021. The increase in weighted average current discount rate during both periods is due primarily to an increase in U.S. Treasury rates.

Policyholder lapse and mortality assumptions reflect the probability that an insureds’ coverage is discontinued due to lapsation or death of the insured. For our life insurance products, mortality assumptions also reflect the probability that a benefit payment occurs. Policyholder lapse and mortality assumptions are based on our actual historical experience adjusted for future expectations. Claim incidence and claim resolution rate assumptions related to morbidity and mortality are based on actual experience or industry standards adjusted as appropriate to reflect our actual experience and future expectations. The claim incidence rate assumption is the rate at which new claims are submitted and the development of this assumption may involve many factors, including the age of the insured, the insured's occupation or industry, the benefit plan design, and certain external factors such as consumer confidence and levels of unemployment. The claim resolution rate assumption is the probability that a claim will close due to recovery or death of the insured and is used to estimate how long benefits will be paid on an open claim. Certain product lines may utilize additional assumptions in calculating the liability for future policy benefits in addition to those listed above such as premium rate increases for long-term care, benefit offsets for long-term disability, and claim costs for voluntary benefits. Claim costs capture the combined effect of the incidence rate, the expected level of benefit to be paid, and the claim resolution rate.

Cash flow assumptions are reviewed and updated, as needed, at least annually. Assumptions may be updated more frequently if necessary based on trending experience and future expectations. On a quarterly basis, cohort level cash flow measures are updated based on the emergence of actual experience. The updated cash flows are used to determine the updated net premiums and the net premium ratio, which is the present value of benefits and related expenses divided by the present value of gross premiums. The updated net premium ratio is used to calculate the updated liability for future policy benefits as of the beginning of the year, at the original discount rate. The change in the liability for future policy benefits, at the original discount rate, as of the beginning of the period, resulting from changes in cash flow assumptions and resulting from the emergence of actual experience from expected experience, is reflected as the policy benefits - remeasurement loss (gain) in the consolidated

statements of income. The impact of all other changes in the liability for future policy benefits are reflected as policy benefits in the consolidated statements of income.

For most products, a net premium methodology is applied to each cohort to estimate the liability for claims not yet incurred in which discounted gross benefits are compared to discounted gross premiums. In this methodology, actual experience to date is combined with projected future cash flows to determine a net premium ratio for each cohort. The future cash flows include the costs of future expected claims as well as future cash flows on claims that have already been incurred. The net premium ratio is then used to estimate the liability for future policy benefits. The liability for future policy benefits represents the present value of future claims and associated expenses less the present value of future net premiums, which is derived by multiplying the present value of future gross premium by the net premium ratio.

For our group products in the Unum US and Unum International segments, we evaluate the liability for future policy benefits required for active policies in comparison to incurred claims. Given the term nature of the products, their renewal features, and level funding nature of the premium for these products, we have determined that the liability value is generally zero for policies that are not on claim. In this situation, our liability for future policy benefit values are limited to the liability associated with claims incurred as of the valuation date.

Multiple estimation methods exist to establish liabilities for the incurred claim component of future policy benefits. Available reserving methods utilized to calculate these liabilities include the tabular reserve method, the paid loss development method, the incurred loss development method, the count and severity method, and the expected claim cost method. No single method is better than the others in all situations and for all product lines. The estimation methods we have chosen are those that we believe produce the most accurate and reliable liability.

We use a tabular reserve methodology on reported claims for our Unum US group long-term disability and individual disability claims as well as for our Closed Block long-term care claims. Under the tabular reserve methodology, the liability for reported claims is based on certain characteristics of the actual reported claimants and their related policy provisions, such as age, length of time disabled, and medical diagnosis, as well as assumptions regarding claim duration, discount rate, and policy benefit offsets. We believe the tabular reserve method is the most accurate to calculate long-term liabilities and allows us to use the most available known facts about each claim. Incurred, but not reported (IBNR) liabilities for future policy benefits for our longer-term products are calculated using the count and severity method using historical patterns of the claims to be reported and the associated claim costs. For Unum US group short-term disability products, an estimate of the value of future payments to be made on claims already submitted, as well as on IBNR claims, is determined in aggregate using a paid loss development method rather than on the individual claimant basis that we use for reported claims on longer-term products. The average length of time between the event triggering a claim under a policy and the final resolution of those claims is much shorter for these products and results in less estimation variability.

Liabilities for claims for Unum US group life and accidental death and dismemberment products are related primarily to death claims reported but not yet paid, IBNR death claims, and a liability for waiver of premium benefits in the event the policyholder becomes disabled. The death claim liability is based on the actual face amount to be paid, the IBNR liability is calculated using the count and severity method based on historical patterns of the claims, and the waiver of premium benefits liability is calculated using the tabular reserve methodology.

Liabilities for claims related to the group and individual dental and vision products reported in our Unum US and Colonial Life segments have a short claim payout period. As a result, the liabilities, which primarily represent IBNR and a small amount of claims pending payment, are calculated using the paid loss development method.

Liabilities for future policy benefits supporting the group products within our Unum International segment are calculated using generally the same methodology that we use for Unum US group disability and group life liabilities. Liabilities for future policy benefits for our Unum UK group life dependent product, which provides an annuity to the beneficiary upon the death of an employee, are calculated using discounted cash flows, based on our assumptions for claim duration and discount rates. The assumptions used in calculating liabilities for future policy benefits for this segment are based on standard country-specific industry experience, adjusted for our own experience.

Certain products in the Colonial Life segment and the Unum US voluntary benefits product line have shorter-term benefits, which generally have less estimation variability than our longer-term products because of the shorter claim payout period. Our liabilities for future policy benefits for these lines of business are predominantly determined using the incurred loss development method based on our own experience. The incurred loss development method uses the historical patterns of payments by loss date to predict future claim payments for each loss date. Where the incurred loss development method may not be appropriate, we estimate the incurred claims using an expected claim cost per policy or other measure of exposure.

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Accounting Changes and Error Corrections (Tables)

9 Months Ended

Sep. 30, 2023

Accounting Changes and Error Corrections [Abstract]

Schedule of New Accounting Pronouncements

The following table summarizes the changes in stockholders' equity due to the adoption of ASU 2018-12 and the resulting adjusted balances at January 1, 2021:

	Consolidated
	Retained Earnings		Accumulated Other Comprehensive Income (Loss)		Total Stockholders' Equity
	(in millions of dollars)
Balance at December 31, 2020	$	11,269.6	$	374.2	$	10,871.0
Impact of the Adoption of ASU 2018-12	(20.6)		(6,684.4)		(6,705.0)
Balance at January 1, 2021	$	11,249.0	$	(6,310.2)	$	4,166.0

Liability for Future Policy Benefits

The following tables summarize the changes in the liability for future policy benefits due to the adoption of ASU 2018-12 and the resulting adjusted balance at January 1, 2021. The removal of shadow adjustments and effect of change in discount rate assumptions are both recorded as transition adjustments to accumulated other comprehensive income (loss) (AOCI) while the adjustments for loss contracts are recorded as a transition adjustment to retained earnings.

	Unum US		Unum International		Colonial Life		Closed Block		Consolidated
	(in millions of dollars)
Balance at December 31, 20201	$	12,184.6	$	2,969.8	$	1,977.2	$	28,572.8	$	45,704.4
Removal of Shadow Adjustments2	(1,569.7)		(545.8)		(44.5)		(4,065.6)		(6,225.6)
Adjustments for Loss Contracts3	—		—		34.9		—		34.9
Effect of Change in Discount Rate Assumptions	2,251.8		779.4		568.6		12,484.8		16,084.6
Other4	(5.3)		—		(7.6)		—		(12.9)
Balance at January 1, 2021	12,861.4		3,203.4		2,528.6		36,992.0		55,585.4
Reinsurance Recoverable5	357.7		132.5		4.4		10,001.4		10,496.0
Balance, Net of Reinsurance, at January 1, 2021	$	12,503.7	$	3,070.9	$	2,524.2	$	26,990.6	$	45,089.4
1We previously reported policy and contract benefits and reserves for future policy and contract benefits liabilities in our consolidated balance sheet as of December 31, 2020 of $1,855.4 million and $49,653.0 million, respectively, resulting in total policyholder liabilities of $51,508.4 million. These balances were reclassified into new line items, future policy benefits and policyholders' account balances, which would have reported balances of $45,704.4 million and $5,804.0 million as of December 31, 2020, respectively, resulting in total policyholder liabilities of $51,508.4 million under the historical accounting method. These balances were reclassified to more closely align with the new disclosure requirements of ASU 2018-12.
2Shadow adjustments represent the adjustments related to unrealized investment gains and losses previously included in the reserves balance prior to the adoption of ASU 2018-12.
3Adjustment for loss contracts represents the adjustment for those cohorts whose net premium ratio exceeded 100 percent as of the transition date. For those cohorts, the net premiums were set equal to the gross premiums and the difference was recorded as a transition adjustment to the liability for future policy benefits.
4This amount reflects the effect of the reclassification of certain unearned premium. This amount was reclassified to more closely align with the presentation of liabilities under ASU 2018-12 and had no impact to stockholders' equity.
5These amounts represent the portion of reinsurance recoverable related to the liability for future policy benefits. These amounts include the adjustments for the removal of shadow adjustments and for the effect of change in discount rate assumptions for the liability for future policy benefits ceded to third party reinsurers.

	Unum US Segment
	Group Disability		Group Life and AD&D		Individual Disability		Voluntary Benefits		Dental and Vision		Total
	(in millions of dollars)
Balance at December 31, 2020	$	7,409.0	$	1,123.9	$	2,485.3	$	1,154.9	$	11.5	$	12,184.6
Removal of Shadow Adjustments	(1,025.2)		(88.5)		(446.1)		(9.9)		—		(1,569.7)
Effect of Change in Discount Rate Assumptions	911.9		91.9		728.5		519.5		—		2,251.8
Other	—		—		—		(5.3)		—		(5.3)
Balance at January 1, 2021	7,295.7		1,127.3		2,767.7		1,659.2		11.5		12,861.4
Reinsurance Recoverable	58.3		3.0		260.6		35.7		0.1		357.7
Balance, Net of Reinsurance, at January 1, 2021	$	7,237.4	$	1,124.3	$	2,507.1	$	1,623.5	$	11.4	$	12,503.7

	Closed Block Segment
	Long-term Care		All Other		Total
	(in millions of dollars)
Balance at December 31, 2020	$	16,283.4	$	12,289.4	$	28,572.8
Removal of Shadow Adjustments	(3,465.4)		(600.2)		(4,065.6)
Effect of Change in Discount Rate Assumptions	9,922.9		2,561.9		12,484.8
Balance at January 1, 2021	22,740.9		14,251.1		36,992.0
Reinsurance Recoverable	44.4		9,957.0		10,001.4
Balance, Net of Reinsurance, at January 1, 2021	$	22,696.5	$	4,294.1	$	26,990.6

Deferred Acquisition Costs (DAC)

The following tables summarize the changes in DAC due to the adoption of ASU 2018-12 and the resulting adjusted balance at January 1, 2021. The removal of shadow adjustments is recorded as a transition adjustment to AOCI.

	Unum US1		Unum International		Colonial Life		Consolidated
	(in millions of dollars)
Balance at December 31, 2020	$	1,168.7	$	32.0	$	1,071.9	$	2,272.6
Removal of Shadow Adjustments	12.3		—		72.8		85.1
Balance at January 1, 2021	$	1,181.0	$	32.0	$	1,144.7	$	2,357.7
1The $12.3 million removal of shadow adjustments is related to the Unum US voluntary benefits product line.

Impact of the Adoption of ASU 2018-12 on Historical Financial Statements:

The following tables present the effect of the adoption of ASU 2018-12 on our historical consolidated financial statements:

	September 30, 2022
	Historical Accounting Method		As Adjusted		Effect of Change
	(in millions of dollars)
Consolidated Balance Sheets
Assets
Reinsurance Recoverable	$	10,289.7	$	9,574.1	$	(715.6)
Deferred Acquisition Costs	2,254.6		2,526.5		271.9
Deferred Income Tax	523.1		601.2		78.1
Other Assets1	1,797.6		1,674.4		(123.2)
Total Assets	60,866.7		60,377.9		(488.8)
Liabilities
Policy and Contract Benefits2	$	1,771.4	$	—	$	(1,771.4)
Reserves for Future Policy and Contract Benefits2	42,108.7		—		(42,108.7)
Future Policy Benefits2	—		37,808.0		37,808.0
Policyholders' Account Balances2	—		5,812.8		5,812.8
Unearned Premiums	394.0		406.8		12.8
Deferred Income Tax	6.5		20.9		14.4
Total Liabilities	52,207.2		51,975.1		(232.1)
Stockholders' Equity
Accumulated Other Comprehensive Loss	$	(3,134.7)	$	(3,611.0)	$	(476.3)
Retained Earnings	12,698.3		12,917.9		219.6
Total Stockholders' Equity	8,659.5		8,402.8		(256.7)
1The change in other assets is driven by the cost of reinsurance associated with the second phase of our Closed Block individual disability reinsurance transaction which was completed in the first quarter of 2021. In accordance with the provisions of the ASU related to non-contemporaneous reinsurance, we were then required to establish the ceded reserves using an upper-medium grade fixed-income instrument as of the reinsurance transaction date in March 2021 which resulted in higher ceded reserves compared to that which was reported historically.
2We previously reported policy and contract benefits and reserves for future policy and contract benefits liabilities in our consolidated balance sheet as of September 30, 2022 of $1,771.4 million and $42,108.7 million, respectively, resulting in total policyholder liabilities of $43,880.1 million. These balances were reclassified into new line items, future policy benefits and policyholders' account balances, which would have reported balances of $38,079.8 million and $5,800.3 million, respectively, as of September 30, 2022, resulting in total policyholder liabilities of $43,880.1 million under the historical accounting method.

	December 31, 2022
	Historical Accounting Method		As Adjusted		Effect of Change
	(in millions of dollars)
Consolidated Balance Sheets
Assets
Reinsurance Recoverable	$	10,218.6	$	9,608.0	$	(610.6)
Deferred Acquisition Costs	2,252.3		2,560.0		307.7
Deferred Income Tax	449.8		586.0		136.2
Other Assets	1,786.3		1,666.6		(119.7)
Total Assets	61,434.9		61,148.5		(286.4)
Liabilities
Policy and Contract Benefits1	$	1,839.8	$	—	$	(1,839.8)
Reserves for Future Policy and Contract Benefits1	42,330.2		—		(42,330.2)
Future Policy Benefits1	—		38,577.1		38,577.1
Policyholders' Account Balances1	—		5,740.2		5,740.2
Unearned Premiums	352.7		365.5		12.8
Deferred Income Tax	9.2		25.2		16.0
Total Liabilities	52,237.4		52,413.5		176.1
Stockholders' Equity
Accumulated Other Comprehensive Loss	$	(2,756.6)	$	(3,448.3)	$	(691.7)
Retained Earnings	12,912.1		13,141.3		229.2
Total Stockholders' Equity	9,197.5		8,735.0		(462.5)
1We previously reported policy and contract benefits and reserves for future policy and contract benefits liabilities in our consolidated balance sheet as of December 31, 2022 of $1,839.8 million and $42,330.2 million, respectively, resulting in total policyholder liabilities of $44,170.0 million. These balances were reclassified into new line items, future policy benefits and policyholders' account balances, which would have reported balances of $38,443.2 million and $5,726.8 million, respectively, as of December 31, 2022, resulting in total policyholder liabilities of $44,170.0 million under the historical accounting method.

	Three Months Ended September 30, 2022
	Historical Accounting Method		As Adjusted		Effect of Change
	(in millions of dollars, except share data and where noted)
Consolidated Statements of Income
Premium Income	$	2,391.7	$	2,388.9	$	(2.8)
Policy Benefits1	1,579.3		1,843.2		263.9
Policy Benefits - Remeasurement Gain	—		(341.7)		(341.7)
Amortization of Deferred Acquisition Costs	150.8		102.9		(47.9)
Other Expenses	247.3		243.9		(3.4)
Income Tax - Deferred	(52.3)		(25.6)		26.7
Net Income	410.7		510.3		99.6
Net Income Per Common Share
Basic	$	2.05	$	2.55	$	0.50
Assuming Dilution	$	2.04	$	2.53	$	0.49
Consolidated Statements of Comprehensive Income (Loss)
Net Income	$	410.7	$	510.3	$	99.6
Change in Adjustment to Deferred Acquisition Costs and Reserves for Future Policy and Contract Benefits, Net of Reinsurance	661.4		—		(661.4)
Change in the Effect of Discount Rate Assumptions on the Liability for Future Policy Benefits, Net of Reinsurance	—		2,222.9		2,222.9
Change in Foreign Currency Translation Adjustment	(71.1)		(71.5)		(0.4)
Comprehensive Income (Loss)	(951.8)		708.8		1,660.6
Consolidated Statements of Stockholders' Equity
Accumulated Other Comprehensive Income (Loss)
Balance at Beginning of Period	$	(1,772.2)	$	(3,809.5)	$	(2,037.3)
Other Comprehensive Income (Loss)	(1,362.5)		198.5		1,561.0
Retained Earnings
Balance at Beginning of Period	$	12,353.7	$	12,473.7	$	120.0
Net Income	410.7		510.3		99.6
1 Previously disclosed as Benefits and Change in Reserves for Future Benefits

	Nine Months Ended September 30, 2022
	Historical Accounting Method		As Adjusted		Effect of Change
	(in millions of dollars, except share data and where noted)
Consolidated Statements of Income
Premium Income	$	7,212.3	$	7,206.3	$	(6.0)
Policy Benefits1	5,181.3		5,691.9		510.6
Policy Benefits - Remeasurement Gain	—		(476.1)		(476.1)
Amortization of Deferred Acquisition Costs	449.5		313.0		(136.5)
Other Expenses	744.4		734.4		(10.0)
Income Tax - Deferred	(147.9)		(125.3)		22.6
Net Income	1,034.6		1,118.0		83.4
Net Income Per Common Share
Basic	$	5.14	$	5.55	$	0.41
Assuming Dilution	$	5.11	$	5.52	$	0.41
Consolidated Statements of Comprehensive Income (Loss)
Net Income	$	1,034.6	$	1,118.0	$	83.4
Change in Adjustment to Deferred Acquisition Costs and Reserves for Future Policy and Contract Benefits, Net of Reinsurance	(7,500.7)		—		7,500.7
Change in the Effect of Discount Rate Assumptions on the Liability for Future Policy Benefits, Net of Reinsurance	—		9,252.4		9,252.4
Change in Foreign Currency Translation Adjustment	(164.1)		(164.9)		(0.8)
Comprehensive Income (Loss)	(2,454.2)		2,671.6		5,125.8
Consolidated Statements of Stockholders' Equity
Accumulated Other Comprehensive Income (Loss)
Balance at Beginning of Year	$	354.1	$	(5,164.6)	$	(5,518.7)
Other Comprehensive Income (Loss)	(3,488.8)		1,553.6		5,042.4
Retained Earnings
Balance at Beginning of Year	$	11,853.2	$	11,989.4	$	136.2
Net Income	1,034.6		1,118.0		83.4
Consolidated Statements of Cash Flows
Cash Flows from Operating Activities
Net Income	$	1,034.6	$	1,118.0	$	83.4
Change in Receivables	437.8		457.9		20.1
Change in Deferred Acquisition Costs	30.4		(106.1)		(136.5)
Change in Insurance Liabilities	(125.5)		(112.6)		12.9
Change in Income Taxes	(21.6)		7.3		28.9
Amortization of the Cost of Reinsurance	48.5		38.5		(10.0)
1 Previously disclosed as Benefits and Change in Reserves for Future Benefits

The decrease in AOCI in our recast of 2022 as shown in the preceding charts is driven primarily by the difference between the discount rate applied under the historical accounting method, which was based on an expected investment yield from our current investment strategy, and the single-A discount rate that is required as a part of the adoption of ASU 2018-12. The most significant impact is related to our longest duration products. Our investment strategy reflects the illiquid nature of the majority of our liability cash flows and, as a result, the yields in our investment portfolios supporting the cash outflows required for these products are generally higher than a single-A yield. In addition, the discount rates applied under the historical accounting method to the reserves for our longest duration products, such as long-term care, included an assumption for long-term yields rising to more historical levels.

The net favorable impact of the adoption of ASU 2018-12 to net income for the three and nine months ended September 30, 2022 shown in the preceding charts is due primarily to the following changes:

• Updating the lifetime cohort net premium ratios, or lifetime loss ratio, for actual experience each reporting period will generally cause earnings patterns to be more consistent from period to period, with variances in experience reflected in earnings over the cohort lifetime. This resulted in an unfavorable impact to income for the three and nine months ended September 30, 2022

• Alignment of amortization of deferred acquisition costs to a constant level basis and modification of amortization periods to reflect the expected term of the related contracts could result in either higher or lower income for the affected product lines. This resulted in a net favorable impact to income for the three and nine months ended September 30, 2022.

• Accelerated recognition of the provision for adverse deviation or other differences from current best estimate values for policies issued prior to the transition date and due to not establishing the provision for policies issued on or after the transition date will generally result in higher income most notably in the initial years after the transition date. This resulted in a favorable impact to income for the three and nine months ended September 30, 2022.

• Establishing reserves for claims incurred on or after the transition date at interest rates prescribed by the update could result in either higher or lower income for the affected product lines depending on the policy issue date and the interest rate environment at that time. This resulted in a favorable impact to income for the three and nine months ended September 30, 2022.

• Updating cash flow assumptions could result in either higher or lower income. This resulted in a favorable impact to income for the three and nine months ended September 30, 2022.

• Accounting for non-contemporaneous reinsurance related to the second phase of our Closed Block individual disability reinsurance transaction which was completed in the first quarter of 2021. As a result of the execution of the second phase of the reinsurance transaction occurring after January 1, 2021, the transition date of ASU 2018-12, in accordance with the provisions of the ASU related to non-contemporaneous reinsurance, we were required to establish the ceded reserves using an upper-medium grade fixed-income instrument as of the reinsurance transaction date in March 2021 which resulted in higher ceded reserves compared to that which was reported historically. However, the direct reserves for the block reinsured in the second phase were calculated using the original discount rate utilized as of the transition date. Both the direct and ceded reserves are then remeasured at each reporting period using a current discount rate reflective of an upper-medium grade fixed-income instrument, with the changes recognized in OCI. While the total equity impact is neutral, the different original discount rates utilized for direct and ceded reserves result in disproportionate earnings impacts. The differential in the original discount rate applied to the direct and ceded cohorts of business resulted in an unfavorable impact to income for the three and nine months ended September 30, 2022, partially offset by a decrease in the amortization of the cost of reinsurance as a result of a lower cost of reinsurance.

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Fair Values of Financial Instruments (Tables)

9 Months Ended

Sep. 30, 2023

Fair Value Disclosures [Abstract]

Fair Value, Investments, Entities that Calculate Net Asset Value Per Share

The following tables present additional information about our private equity partnerships, including commitments for additional investments which may or may not be funded:

		September 30, 2023
Investment Category		Fair Value		Redemption Term / Redemption Notice	Unfunded Commitments
		(in millions of dollars)			(in millions of dollars)
Private Credit	(a)	$	238.0	Not redeemable	$	127.7
		48.7		Quarterly / 90 days notice	3.2
Total Private Credit		286.7			130.9
Private Equity	(b)	514.9		Not redeemable	420.2
		26.4		Initial 5.5 year lock on each new investment / Quarterly after 5.5 year lock with 90 days notice	17.6
Total Private Equity		541.3			437.8
Real Assets	(c)	420.3		Not redeemable	268.2
		32.6		Quarterly / 90 days notice	—
Total Real Assets		452.9			268.2
Total Partnerships		$	1,280.9		$	836.9

		December 31, 2022
Investment Category		Fair Value		Redemption Term / Redemption Notice	Unfunded Commitments
		(in millions of dollars)			(in millions of dollars)
Private Credit	(a)	$	239.3	Not redeemable	$	90.9
		35.7		Initial 2 year lock on each new investment / Quarterly after 2 year lock with 90 days notice	13.4
Total Private Credit		275.0			104.3
Private Equity	(b)	453.6		Not redeemable	377.2
		31.7		Initial 5.5 year lock on each new investment / Quarterly after 5.5 year lock with 90 days notice	39.1
Total Private Equity		485.3			416.3
Real Assets	(c)	373.9		Not redeemable	256.3
		60.1		Quarterly / 90 days notice	—
Total Real Assets		434.0			256.3
Total Partnerships		$	1,194.3		$	776.9

(a)Private Credit - The limited partnerships described in this category employ various investment strategies, generally providing direct lending or other forms of debt financing including first-lien, second-lien, mezzanine, and subordinated loans. The limited partnerships have credit exposure to corporates, physical assets, and/or financial assets within a variety of industries (including manufacturing, healthcare, energy, business services, technology, materials, and retail) in North America and, to a lesser extent, outside of North America.  As of September 30, 2023, the estimated remaining life of the investments that do not allow for redemptions is approximately 63 percent in the next 3 years, 26 percent during the period from 3 to 5 years, 9 percent during the period from 5 to 10 years, and 2 percent during the period from 10 to 15 years.

(b)Private Equity - The limited partnerships described in this category employ various strategies generally investing in controlling or minority control equity positions directly in companies and/or assets across various industries (including manufacturing, healthcare, energy, business services, technology, materials, and retail), primarily in private markets within North America and, to a lesser extent, outside of North America.  As of September 30, 2023, the estimated remaining life of the investments that do not allow for redemptions is approximately 37 percent in the next 3 years, 28 percent during the period from 3 to 5 years, 28 percent during the period from 5 to 10 years, and 7 percent during the period from 10 to 15 years.

(c)Real Assets - The limited partnerships described in this category employ various strategies, which include investing in the equity and/or debt financing of physical assets, including infrastructure (energy, power, water/wastewater, communications), transportation (including airports, ports, toll roads, aircraft, railcars) and real estate in North America, Europe, South America, and Asia.  As of September 30, 2023, the estimated remaining life of the investments that do not allow for redemptions is approximately 23 percent in the next 3 years, 33 percent during period from 3 to 5 years, 42 percent during the period from 5 to 10 years, and 2 percent during the period from 10 to 15 years.

Fair Values by Fair Value Hierarchy Input level

The following tables present information about financial instruments measured at fair value on a recurring basis by fair value level, based on the observability of the inputs used:

	September 30, 2023
	Level 1		Level 2		Level 3		NAV		Total
	(in millions of dollars)
Assets
Fixed Maturity Securities
United States Government and Government Agencies and Authorities	$	77.0	$	498.0	$	—	$	—	$	575.0
States, Municipalities, and Political Subdivisions	—		3,391.1		—		—		3,391.1
Foreign Governments	—		819.6		—		—		819.6
Public Utilities	650.6		4,310.6		—		—		4,961.2
Mortgage/Asset-Backed Securities	—		559.7		45.2		—		604.9
All Other Corporate Bonds	7,351.0		16,256.1		108.3		—		23,715.4
Redeemable Preferred Stocks	—		3.5		—		—		3.5
Total Fixed Maturity Securities	8,078.6		25,838.6		153.5		—		34,070.7
Other Long-term Investments
Derivatives
Forwards	—		5.0		—		—		5.0
Foreign Exchange Contracts	—		69.8		—		—		69.8
Embedded Derivative in Modified Coinsurance Arrangement	—		—		0.9		—		0.9
Total Derivatives	—		74.8		0.9		—		75.7
Perpetual Preferred and Equity Securities	—		10.4		17.5		—		27.9
Private Equity Partnerships	—		—		—		1,280.9		1,280.9
Total Other Long-term Investments	—		85.2		18.4		1,280.9		1,384.5
Total Financial Instrument Assets Carried at Fair Value	$	8,078.6	$	25,923.8	$	171.9	$	1,280.9	$	35,455.2
Liabilities
Other Liabilities
Derivatives
Forwards	$	—	$	184.1	$	—	$	—	$	184.1
Foreign Exchange Contracts	—		28.6		—		—		28.6
Total Derivatives	—		212.7		—		—		212.7
Total Financial Instrument Liabilities Carried at Fair Value	$	—	$	212.7	$	—	$	—	$	212.7

	December 31, 2022
	Level 1		Level 2		Level 3		NAV		Total
	(in millions of dollars)
Assets
Fixed Maturity Securities
United States Government and Government Agencies and Authorities	$	81.7	$	416.5	$	—	$	—	$	498.2
States, Municipalities, and Political Subdivisions	8.7		3,448.3		0.2		—		3,457.2
Foreign Governments	—		827.1		—		—		827.1
Public Utilities	160.1		4,796.8		—		—		4,956.9
Mortgage/Asset-Backed Securities	—		551.3		22.0		—		573.3
All Other Corporate Bonds	4,268.6		20,097.3		158.7		—		24,524.6
Redeemable Preferred Stocks	—		3.5		—		—		3.5
Total Fixed Maturity Securities	4,519.1		30,140.8		180.9		—		34,840.8
Other Long-term Investments
Derivatives
Forwards	—		5.6		—		—		5.6
Foreign Exchange Contracts	—		83.5		—		—		83.5
Total Derivatives	—		89.1		—		—		89.1
Perpetual Preferred and Equity Securities	—		9.6		16.2		—		25.8
Private Equity Partnerships	—		—		—		1,194.3		1,194.3
Total Other Long-term Investments	—		98.7		16.2		1,194.3		1,309.2
Total Financial Instrument Assets Carried at Fair Value	$	4,519.1	$	30,239.5	$	197.1	$	1,194.3	$	36,150.0
Liabilities
Other Liabilities
Derivatives
Forwards	$	—	$	48.5	$	—	$	—	$	48.5
Foreign Exchange Contracts	—		25.5		—		—		25.5
Embedded Derivative in Modified Coinsurance Arrangement	—		—		13.9		—		13.9
Total Derivatives	—		74.0		13.9		—		87.9
Total Financial Instrument Liabilities Carried at Fair Value	$	—	$	74.0	$	13.9	$	—	$	87.9

Changes in Assets and Liabilities Measured at Fair Value on a Recurring Basis using Significant Unobservable Inputs

Changes in assets and liabilities measured at fair value on a recurring basis using significant unobservable inputs (Level 3) are as follows:

	Three Months Ended September 30, 2023
	Fair Value Beginning of Period		Total Realized and Unrealized Investment Gains (Losses) in								Level 3 Transfers				Fair Value End of Period		Change in Unrealized Gain (Loss) on Securities Held at the End of Period included in
			Earnings		OCI		Purchases		Sales/Maturities		Into		Out of				OCI		Earnings
	(in millions of dollars)
Fixed Maturity Securities
Public Utilities	$	—	$	(0.1)	$	0.1	$	—	$	(3.9)	$	3.9	$	—	$	—	$	—	$	—
Mortgage/Asset-Backed Securities	24.1		—		(1.4)		19.0		(1.0)		4.7		(0.2)		45.2		(1.4)		—
All Other Corporate Bonds	128.8		(4.6)		2.0		—		(54.9)		87.5		(50.5)		108.3		2.0		—
Total Fixed Maturity Securities	152.9		(4.7)		0.7		19.0		(59.8)		96.1		(50.7)		153.5		0.6		—
Perpetual Preferred and Equity Securities	17.5		—		—		—		—		—		—		17.5		—		—
Embedded Derivative in Modified Coinsurance Arrangement	(8.4)		9.3		—		—		—		—		—		0.9		—		9.3

	Three Months Ended September 30, 2022
	Fair Value Beginning of Period		Total Realized and Unrealized Investment Gains (Losses) in								Level 3 Transfers				Fair Value End of Period		Change in Unrealized Gain (Loss) on Securities Held at the End of Period included in
			Earnings		OCI		Purchases		Sales/Maturities		Into		Out of				OCI		Earnings
	(in millions of dollars)
Fixed Maturity Securities
States, Municipalities, and Political Subdivisions	$	—	$	—	$	(0.1)	$	—	$	—	$	0.3	$	—	$	0.2	$	(0.1)	$	—
Foreign Governments	20.2		—		(0.2)		—		—		—		—		20.0		(0.2)		—
Public Utilities	13.6		(0.4)		—		—		—		—		—		13.2		—		(0.4)
Mortgage/Asset-Backed Securities	11.6		—		0.6		—		(0.3)		0.2		(0.9)		11.2		0.6		—
All Other Corporate Bonds	103.5		—		(5.4)		1.3		(13.0)		57.9		(20.9)		123.4		(5.4)		—
Total Fixed Maturity Securities	148.9		(0.4)		(5.1)		1.3		(13.3)		58.4		(21.8)		168.0		(5.1)		(0.4)
Perpetual Preferred and Equity Securities	10.9		(0.1)		—		2.7		—		—		—		13.5		—		(0.1)
Embedded Derivative in Modified Coinsurance Arrangement	(34.3)		14.9		—		—		—		—		—		(19.4)		—		14.9

	Nine Months Ended September 30, 2023
	Fair Value Beginning of Year		Total Realized and Unrealized Investment Gains (Losses) in								Level 3 Transfers				Fair Value End of Period		Change in Unrealized Gain (Loss) on Securities Held at the End of Period included in
			Earnings		OCI		Purchases		Sales/Maturities		Into		Out of				OCI		Earnings
	(in millions of dollars)
Fixed Maturity Securities
States, Municipalities, and Political Subdivisions	$	0.2	$	—	$	—	$	—	$	—	$	—	$	(0.2)	$	—	$	—	$	—
Public Utilities	—		0.1		(0.1)		—		(7.2)		7.2		—		—		—		—
Mortgage/Asset-Backed Securities	22.0		—		(1.5)		29.9		(2.8)		6.6		(9.0)		45.2		(1.5)		—
All Other Corporate Bonds	158.7		(5.1)		(20.6)		1.5		(229.8)		276.0		(72.4)		108.3		(20.6)		—
Total Fixed Maturity Securities	180.9		(5.0)		(22.2)		31.4		(239.8)		289.8		(81.6)		153.5		(22.1)		—
Perpetual Preferred and Equity Securities	16.2		0.6		—		0.7		—		—		—		17.5		—		0.6
Embedded Derivative in Modified Coinsurance Arrangement	(13.9)		14.8		—		—		—		—		—		0.9		—		14.8

	Nine Months Ended September 30, 2022
	Fair Value Beginning of Year		Total Realized and Unrealized Investment Gains (Losses) in								Level 3 Transfers				Fair Value End of Period		Change in Unrealized Gain (Loss) on Securities Held at the End of Period included in
			Earnings		OCI		Purchases		Sales/Maturities		Into		Out of				OCI		Earnings
	(in millions of dollars)
Fixed Maturity Securities
States, Municipalities, and Political Subdivisions	$	13.4	$	—	$	(0.1)	$	0.3	$	—	$	—	$	(13.4)	$	0.2	$	(0.1)	$	—
Foreign Governments	20.8		—		(0.8)		—		—		—		—		20.0		(0.8)		—
Public Utilities	44.5		(4.6)		2.2		—		(10.8)		15.6		(33.7)		13.2		2.2		(4.6)
Mortgage/Asset-Backed Securities	187.2		—		(1.2)		9.9		(9.5)		—		(175.2)		11.2		(1.2)		—
All Other Corporate Bonds	861.5		—		(29.5)		8.8		(20.9)		18.3		(714.8)		123.4		(29.5)		—
Total Fixed Maturity Securities	1,127.4		(4.6)		(29.4)		19.0		(41.2)		33.9		(937.1)		168.0		(29.4)		(4.6)
Perpetual Preferred and Equity Securities	5.8		2.7		—		5.0		—		—		—		13.5		—		2.7
Embedded Derivative in Modified Coinsurance Arrangement	(30.1)		10.7		—		—		—		—		—		(19.4)		—		10.7

Realized and unrealized investment gains and losses presented in the preceding tables represent gains and losses only for the time during which the applicable financial instruments were classified as Level 3. The transfers between levels resulted primarily from a change in observability of three inputs used to determine fair values of the securities transferred: (1) transactional data for new issuance and secondary trades, (2) broker/dealer quotes and pricing, primarily related to changes in the level of activity in the market and whether the market was considered orderly, and (3) comparable bond metrics from which to perform an analysis. For fair value measurements of financial instruments that were transferred either into or out of Level 3, we reflect the transfers using the fair value at the beginning of the period. We believe this allows for greater transparency, as all changes in fair value that arise during the reporting period of the transfer are disclosed as a component of our Level 3 reconciliation.

Quantitative Information Regarding Significant Unobservable Inputs

The table below provides quantitative information regarding the significant unobservable inputs used in Level 3 fair value measurements derived from internal models. Unobservable inputs for fixed maturity securities are weighted by the fair value of the securities. Certain securities classified as Level 3 are excluded from the table below due to limitations in our ability to obtain the underlying inputs used by external pricing sources.

	September 30, 2023
	Fair Value		Valuation Method	Unobservable Input		Range/Weighted Average
	(in millions of dollars)
Fixed Maturity Securities
All Other Corporate Bonds - Private	$	16.2	Market Approach	Volatility of Credit Market Convention	(a) (b)	5.00% - 5.00% / 5.00% Priced at Par Value
Perpetual Preferred and Equity Securities	17.5		Market Approach	Market Convention	(b)	Priced at Cost, Owner's Equity, or Most Recent Round
Embedded Derivative in Modified Coinsurance Arrangement	0.9		Discounted Cash Flows	Projected Liability Cash Flows Weighted Spread of Swap Curve	(c)	Actuarial Assumptions 0.2%

	December 31, 2022
	Fair Value		Valuation Method	Unobservable Input		Range/Weighted Average
	(in millions of dollars)
Fixed Maturity Securities
All Other Corporate Bonds - Private	$	15.3	Market Approach	Volatility of Credit Market Convention	(a) (b)	5.41% - 5.41% / 5.41% Priced at Par Value
Perpetual Preferred and Equity Securities	16.2		Market Approach	Market Convention	(b)	Priced at Cost, Owner's Equity, or Most Recent Round
Embedded Derivative in Modified Coinsurance Arrangement	(13.9)		Discounted Cash Flows	Projected Liability Cash Flows Weighted Spread of Swap Curve	(c)	Actuarial Assumptions 0.6%

(a)Represents basis point adjustments for credit-specific factors

(b)Represents a decision to price based on par value, cost, owner's equity, or the price of the most recent capital funding round when limited data is available

(c)Represents various actuarial assumptions required to derive the liability cash flows. Fair value of embedded derivative is most often driven by the change in the weighted average credit spread to the swap curve for the assets backing the hypothetical loan

Carrying Amount and Fair Value of Financial Instruments

The following table presents the carrying amounts and estimated fair values of our financial instruments not measured at fair value and indicates the level in the fair value hierarchy of the estimated fair value measurement based on the observability of the inputs used:

	September 30, 2023
	Estimated Fair Value
	Level 1		Level 2		Level 3		Total		Carrying Value
	(in millions of dollars)
Assets
Mortgage Loans	$	—	$	1,984.5	$	—	$	1,984.5	$	2,321.5
Policy Loans	—		—		3,654.0		3,654.0		3,596.6
Other Long-term Investments
Miscellaneous Long-term Investments	—		16.3		0.5		16.8		16.8
Total Financial Instrument Assets Not Carried at Fair Value	$	—	$	2,000.8	$	3,654.5	$	5,655.3	$	5,934.9
Liabilities
Long-term Debt	$	2,593.2	$	390.5	$	—	$	2,983.7	$	3,429.8
Other Liabilities
Unfunded Commitments	—		0.2		—		0.2		0.2
Payable for Collateral on FHLB Funding Agreements	—		76.9		—		76.9		76.9
Total Financial Instrument Liabilities Not Carried at Fair Value	$	2,593.2	$	467.6	$	—	$	3,060.8	$	3,506.9

	December 31, 2022
	Estimated Fair Value
	Level 1		Level 2		Level 3		Total		Carrying Value
	(in millions of dollars)
Assets
Mortgage Loans	$	—	$	2,159.5	$	—	$	2,159.5	$	2,435.4
Policy Loans	—		—		3,677.0		3,677.0		3,601.2
Other Long-term Investments
Miscellaneous Long-term Investments	—		17.1		1.3		18.4		18.4
Total Financial Instrument Assets Not Carried at Fair Value	$	—	$	2,176.6	$	3,678.3	$	5,854.9	$	6,055.0
Liabilities
Long-term Debt	$	2,288.9	$	783.1	$	—	$	3,072.0	$	3,427.8
Other Liabilities
Unfunded Commitments	—		0.7		—		0.7		0.7
Payable for Collateral on FHLB Funding Agreements	—		99.1		—		99.1		99.1
Total Financial Instrument Liabilities Not Carried at Fair Value	$	2,288.9	$	882.9	$	—	$	3,171.8	$	3,527.6

XML

Investments (Tables)

9 Months Ended

Sep. 30, 2023

Investments, Debt and Equity Securities [Abstract]

Amortized Cost and Fair Values of Securities by Security Type

At September 30, 2023 and December 31, 2022, all fixed maturity securities were classified as available-for-sale. The amortized cost and fair values of securities by security type are shown as follows:

	September 30, 2023
	Amortized Cost, Gross of ACL1		ACL1		Gross Unrealized Gain		Gross Unrealized Loss		Fair Value
	(in millions of dollars)
United States Government and Government Agencies and Authorities	$	605.2	$	—	$	7.9	$	38.1	$	575.0
States, Municipalities, and Political Subdivisions	4,066.9		—		49.8		725.6		3,391.1
Foreign Governments	945.7		—		12.8		138.9		819.6
Public Utilities	5,410.5		—		67.7		517.0		4,961.2
Mortgage/Asset-Backed Securities	655.0		—		4.1		54.2		604.9
All Other Corporate Bonds	26,537.0		—		282.4		3,104.0		23,715.4
Redeemable Preferred Stocks	4.0		—		—		0.5		3.5
Total Fixed Maturity Securities	$	38,224.3	$	—	$	424.7	$	4,578.3	$	34,070.7

	December 31, 2022
	Amortized Cost, Gross of ACL1		ACL1		Gross Unrealized Gain		Gross Unrealized Loss		Fair Value
	(in millions of dollars)
United States Government and Government Agencies and Authorities	$	503.8	$	—	$	20.3	$	25.9	$	498.2
States, Municipalities, and Political Subdivisions	4,006.0		—		87.1		635.9		3,457.2
Foreign Governments	908.1		—		34.9		115.9		827.1
Public Utilities	5,170.9		—		141.0		355.0		4,956.9
Mortgage/Asset-Backed Securities	592.1		—		8.2		27.0		573.3
All Other Corporate Bonds	26,640.3		—		452.1		2,567.8		24,524.6
Redeemable Preferred Stocks	4.0		—		—		0.5		3.5
Total Fixed Maturity Securities	$	37,825.2	$	—	$	743.6	$	3,728.0	$	34,840.8

1 Allowance for Credit Losses

Schedule of Unrealized Loss on Investments

The following charts indicate the length of time our fixed maturity securities have been in a gross unrealized loss position.

	September 30, 2023
	Less Than 12 Months				12 Months or Greater
	Fair Value		Gross Unrealized Loss		Fair Value		Gross Unrealized Loss
	(in millions of dollars)
United States Government and Government Agencies and Authorities	$	245.5	$	8.8	$	186.2	$	29.3
States, Municipalities, and Political Subdivisions	670.3		35.5		1,851.7		690.1
Foreign Governments	152.4		30.8		224.2		108.1
Public Utilities	1,914.7		105.6		1,611.2		411.4
Mortgage/Asset-Backed Securities	189.8		13.2		301.0		41.0
All Other Corporate Bonds	5,012.4		327.8		13,492.9		2,776.2
Redeemable Preferred Stocks	—		—		3.5		0.5
Total Fixed Maturity Securities	$	8,185.1	$	521.7	$	17,670.7	$	4,056.6

	December 31, 2022
	Less Than 12 Months				12 Months or Greater
	Fair Value		Gross Unrealized Loss		Fair Value		Gross Unrealized Loss
	(in millions of dollars)
United States Government and Government Agencies and Authorities	$	246.6	$	22.6	$	12.2	$	3.3
States, Municipalities, and Political Subdivisions	1,920.1		476.1		346.6		159.8
Foreign Governments	160.1		47.9		176.9		68.0
Public Utilities	2,242.2		252.0		255.2		103.0
Mortgage/Asset-Backed Securities	386.6		27.0		0.1		—
All Other Corporate Bonds	15,865.6		1,799.7		2,194.1		768.1
Redeemable Preferred Stocks	3.5		0.5		—		—
Total Fixed Maturity Securities	$	20,824.7	$	2,625.8	$	2,985.1	$	1,102.2

Distribution of the Maturity Dates for Fixed Maturity Securities

The following is a distribution of the maturity dates for fixed maturity securities. The maturity dates have not been adjusted for possible calls or prepayments.

	September 30, 2023
	Amortized Cost, Net of ACL1		Unrealized Gain Position				Unrealized Loss Position
			Gross Gain		Fair Value		Gross Loss		Fair Value
	(in millions of dollars)
1 year or less	$	945.9	$	1.3	$	352.8	$	5.0	$	589.4
Over 1 year through 5 years	7,541.9		67.7		1,988.1		311.5		5,310.0
Over 5 years through 10 years	9,393.8		187.5		2,879.0		955.4		5,746.9
Over 10 years	19,687.7		164.1		2,880.9		3,252.2		13,718.7
	37,569.3		420.6		8,100.8		4,524.1		25,365.0
Mortgage/Asset-Backed Securities	655.0		4.1		114.1		54.2		490.8
Total Fixed Maturity Securities	$	38,224.3	$	424.7	$	8,214.9	$	4,578.3	$	25,855.8

	December 31, 2022
	Amortized Cost, Net of ACL1		Unrealized Gain Position				Unrealized Loss Position
			Gross Gain		Fair Value		Gross Loss		Fair Value
	(in millions of dollars)
1 year or less	$	1,133.5	$	2.9	$	339.1	$	5.7	$	791.6
Over 1 year through 5 years	7,090.8		86.7		1,953.2		238.4		4,985.9
Over 5 years through 10 years	10,096.7		294.8		3,538.9		863.8		5,988.8
Over 10 years	18,912.1		351.0		5,013.2		2,593.1		11,656.8
	37,233.1		735.4		10,844.4		3,701.0		23,423.1
Mortgage/Asset-Backed Securities	592.1		8.2		186.6		27.0		386.7
Total Fixed Maturity Securities	$	37,825.2	$	743.6	$	11,031.0	$	3,728.0	$	23,809.8

1 Allowance for Credit Losses

Distribution by External Credit Rating for Fixed Maturity Securities

The following chart depicts an analysis of our fixed maturity security portfolio between investment-grade and below-investment-grade categories as of September 30, 2023:

					Gross Unrealized Loss
	Fair Value		Gross Unrealized Gain		Amount		Percent of Total Gross Unrealized Loss
	(in millions of dollars)
Investment-Grade	$	32,659.4	$	420.6	$	4,404.0	96.2	%
Below-Investment-Grade	1,411.3		4.1		174.3		3.8
Total Fixed Maturity Securities	$	34,070.7	$	424.7	$	4,578.3	100.0	%

Debt Securities, Available-for-sale, Allowance for Credit Loss

The following tables present a rollforward of the allowance for credit losses on available-for-sale fixed maturity securities, which were classified as "public utilities" during the three and nine months ended September 30, 2022.

	Three Months Ended September 30
	2023		2022
	(in millions of dollars)
Balance, beginning of period	$	—	$	4.1
Change in allowance on securities with allowance recorded in previous period	—		0.5
Balance, end of period	$	—	$	4.6

	Nine Months Ended September 30
	2023		2022
	(in millions of dollars)
Balance, beginning of period	$	—	$	—
Credit losses on securities for which credit losses were not previously recorded	—		4.6
Balance, end of period	$	—	$	4.6

Mortgage Loans by Property Type and Geographic Region

The carrying amount of mortgage loans by property type and geographic region are presented below.

	September 30, 2023				December 31, 2022
	(in millions of dollars)
	Carrying Amount		Percent of Total		Carrying Amount		Percent of Total
Property Type
Apartment	$	674.8	29.1	%	$	688.6	28.3	%
Industrial	715.5		30.8		745.3		30.6
Office	384.1		16.5		423.0		17.4
Retail	504.1		21.7		534.5		21.9
Other	43.0		1.9		44.0		1.8
Total	$	2,321.5	100.0	%	$	2,435.4	100.0	%
Region
New England	$	55.7	2.4	%	$	52.4	2.2	%
Mid-Atlantic	156.8		6.8		192.4		7.9
East North Central	300.2		12.9		313.0		12.9
West North Central	171.2		7.4		181.4		7.4
South Atlantic	553.6		23.8		539.3		22.1
East South Central	98.8		4.3		101.8		4.2
West South Central	202.7		8.7		212.6		8.7
Mountain	284.8		12.3		298.7		12.3
Pacific	497.7		21.4		543.8		22.3
Total	$	2,321.5	100.0	%	$	2,435.4	100.0	%

Schedule of Participating Mortgage Loans by Internal Credit Rating and Loan to Value

The following tables present information about mortgage loans by the applicable internal quality indicators:

	September 30, 2023				December 31, 2022
	(in millions of dollars)
	Carrying Amount		Percent of Total		Carrying Amount		Percent of Total
Internal Mortgage Rating
AA	$	85.9	3.7	%	$	92.3	3.8	%
A	885.4		38.1		843.9		34.6
BBB	1,309.1		56.4		1,458.0		59.9
BB	41.1		1.8		41.2		1.7
Total	$	2,321.5	100.0	%	$	2,435.4	100.0	%
Loan-to-Value Ratio1
<= 65%	$	1,351.8	58.3	%	$	1,389.6	57.0	%
> 65% <= 75%	762.4		32.8		937.2		38.5
> 75% <= 85%	137.9		5.9		75.0		3.1
> 85%	69.4		3.0		33.6		1.4
Total	$	2,321.5	100.0	%	$	2,435.4	100.0	%

1Loan-to-Value Ratio utilizes the most recent internal valuation of the property

Mortgage Loans by Credit Quality Indicators

The following tables present the amortized cost of our mortgage loans by year of origination and internal quality indicators at September 30, 2023 and December 31, 2022, respectively:

	September 30, 2023
	Prior to 2019		2019		2020		2021		2022		2023		Total
	(in millions of dollars)
Internal Mortgage Rating
AA	$	75.0	$	11.0	$	—	$	—	$	—	$	—	$	86.0
A	585.1		101.0		71.3		90.9		23.4		15.5		887.2
BBB	657.6		226.3		95.3		259.4		64.5		13.0		1,316.1
BB	42.4		—		—		—		—		—		42.4
Total Amortized Cost	1,360.1		338.3		166.6		350.3		87.9		28.5		2,331.7
Allowance for credit losses	(6.6)		(1.3)		(0.6)		(1.0)		(0.6)		(0.1)		(10.2)
Carrying Amount	$	1,353.5	$	337.0	$	166.0	$	349.3	$	87.3	$	28.4	$	2,321.5
Loan-to-Value Ratio1
<=65%	$	882.6	$	199.0	$	110.8	$	146.2	$	16.4	$	—	$	1,355.0
>65<=75%	308.1		139.3		47.5		172.0		71.5		28.5		766.9
>75%<=85%	98.3		—		8.3		32.1		—		—		138.7
>85%	71.1		—		—		—		—		—		71.1
Total Amortized Cost	1,360.1		338.3		166.6		350.3		87.9		28.5		2,331.7
Allowance for credit losses	(6.6)		(1.3)		(0.6)		(1.0)		(0.6)		(0.1)		(10.2)
Carrying Amount	$	1,353.5	$	337.0	$	166.0	$	349.3	$	87.3	$	28.4	$	2,321.5

1Loan-to-Value Ratio utilizes the most recent internal valuation of the property

	December 31, 2022
	Prior to 2018		2018		2019		2020		2021		2022		Total
	(in millions of dollars)
Internal Mortgage Rating
AA	$	53.8	$	27.5	$	11.1	$	—	$	—	$	—	$	92.4
A	485.0		123.3		96.8		35.9		80.6		24.0		845.6
BBB	534.0		219.8		236.9		134.0		275.8		64.6		1,465.1
BB	35.7		5.9		—		—		—		—		41.6
Total Amortized Cost	1,108.5		376.5		344.8		169.9		356.4		88.6		2,444.7
Allowance for credit losses	(4.3)		(1.8)		(1.3)		(0.6)		(0.8)		(0.5)		(9.3)
Carrying Amount	$	1,104.2	$	374.7	$	343.5	$	169.3	$	355.6	$	88.1	$	2,435.4
Loan-to-Value Ratio1
<=65%	$	782.6	$	189.0	$	193.9	$	81.3	$	128.9	$	16.9	$	1,392.6
>65<=75%	230.2		181.6		150.9		80.1		227.5		71.7		942.0
>75%<=85%	67.5		—		—		8.5		—		—		76.0
>85%	28.2		5.9		—		—		—		—		34.1
Total Amortized Cost	1,108.5		376.5		344.8		169.9		356.4		88.6		2,444.7
Allowance for credit losses	(4.3)		(1.8)		(1.3)		(0.6)		(0.8)		(0.5)		(9.3)
Carrying Amount	$	1,104.2	$	374.7	$	343.5	$	169.3	$	355.6	$	88.1	$	2,435.4

1Loan-to-Value Ratio utilizes the most recent internal valuation of the property

Financing Receivable, Allowance for Credit Loss

The following table presents a roll-forward of the allowance for expected credit losses by loan-to-value ratio for the three and nine months ended September 30, 2023 and 2022:

	Three Months Ended September 30, 2023
	Beginning of Period		Current Period Provisions		Write-Offs		Recoveries		End of Period
	(in millions of dollars)
Loan-to-Value Ratio1
<=65%	$	3.3	$	(0.1)	$	—	$	—	$	3.2
>65<=75%	4.8		(0.4)		—		—		4.4
>75%<=85%	0.9		—		—		—		0.9
>85%	2.1		(0.4)		—		—		1.7
Total	$	11.1	$	(0.9)	$	—	$	—	$	10.2

	Three Months Ended September 30, 2022
	Beginning of Period		Current Period Provisions		Write-Offs		Recoveries		End of Period
	(in millions of dollars)
Loan-to-Value Ratio1
<=65%	$	2.3	$	0.2	$	—	$	—	$	2.5
>65<=75%	4.8		0.4		—		—		5.2
>75%<=85%	0.9		(0.2)		—		—		0.7
>85%	0.4		(0.1)		—		—		0.3
Total	$	8.4	$	0.3	$	—	$	—	$	8.7

	Nine Months Ended September 30, 2023
	Beginning of Year		Current Period Provisions		Write-Offs		Recoveries		End of Period
	(in millions of dollars)
Loan-to-Value Ratio1
<=65%	$	3.0	$	0.2	$	—	$	—	$	3.2
>65<=75%	4.7		(0.3)		—		—		4.4
>75%<=85%	1.1		(0.2)		—		—		0.9
>85%	0.5		1.2		—		—		1.7
Total	$	9.3	$	0.9	$	—	$	—	$	10.2

	Nine Months Ended September 30, 2022
	Beginning of Year		Current Period Provisions		Write-Offs		Recoveries		End of Period
	(in millions of dollars)
Loan-to-Value Ratio1
<=65%	$	2.6	$	(0.1)	$	—	$	—	$	2.5
>65<=75%	4.7		0.5		—		—		5.2
>75%<=85%	0.7		—		—		—		0.7
>85%	0.3		—		—		—		0.3
Total	$	8.3	$	0.4	$	—	$	—	$	8.7

1Loan-to-Value Ratio utilizes the most recent internal valuation of the property

Remaining Contractual Maturity of Securities Lending Agreements

The remaining contractual maturities of our securities lending agreements disaggregated by class of assets pledged are as follows:

	September 30, 2023		December 31, 2022
	Overnight and Continuous
	(in millions of dollars)
Borrowings
United States Government and Government Agencies and Authorities	$	—	$	0.3
States, Municipalities, and Political Subdivisions	—		—
Public Utilities	2.2		6.3
All Other Corporate Bonds	57.4		81.9
Total Borrowings	$	59.6	$	88.5
Gross Amount of Recognized Liability for Securities Lending Transactions	59.6		88.5
Amounts Related to Agreements Not Included in Offsetting Disclosure Contained Herein	$	—	$	—

Federal Home Loan Bank Common Stock Carrying Amounts, Amounts Posted, and Advances Received

The carrying value of common stock owned, collateral posted, and advances received are as follows:

	September 30, 2023		December 31, 2022
	(in millions of dollars)
Carrying Value of FHLB Common Stock	$	16.3	$	17.1
Advances from FHLB	76.9		99.1
Carrying Value of Collateral Posted to FHLB
Fixed Maturity Securities	$	536.4	$	527.1
Commercial Mortgage Loans	756.8		801.9
Total Carrying Value of Collateral Posted to FHLB	$	1,293.2	$	1,329.0

Schedule of Financial Instrument and Derivative Offsetting

Shown below are our financial instruments that either meet the accounting requirements that allow them to be offset in our balance sheets or that are subject to an enforceable master netting arrangement or similar agreement. Our accounting policy is to not offset these financial instruments in our balance sheets. Net amounts disclosed below have been reduced by the amount of collateral pledged to or received from our counterparties.

	September 30, 2023
	Gross Amount						Gross Amount Not
	of Recognized		Gross Amount		Net Amount		Offset in Balance Sheet
	Financial		Offset in		Presented in		Financial		Cash		Net
	Instruments		Balance Sheet		Balance Sheet		Instruments		Collateral		Amount
	(in millions of dollars)
Financial Assets:
Derivatives	$	74.8	$	—	$	74.8	$	(74.7)	$	—	$	0.1
Securities Lending	68.3		—		68.3		(8.7)		(59.6)		—
Total	$	143.1	$	—	$	143.1	$	(83.4)	$	(59.6)	$	0.1
Financial Liabilities:
Derivatives	$	212.7	$	—	$	212.7	$	(212.6)	$	—	$	0.1
Securities Lending	59.6		—		59.6		(59.6)		—		—
Total	$	272.3	$	—	$	272.3	$	(272.2)	$	—	$	0.1

	December 31, 2022
	Gross Amount						Gross Amount Not
	of Recognized		Gross Amount		Net Amount		Offset in Balance Sheet
	Financial		Offset in		Presented in		Financial		Cash		Net
	Instruments		Balance Sheet		Balance Sheet		Instruments		Collateral		Amount
	(in millions of dollars)
Financial Assets:
Derivatives	$	89.1	$	—	$	89.1	$	(38.0)	$	(49.4)	$	1.7
Securities Lending	152.4		—		152.4		(63.9)		(88.5)		—
Total	$	241.5	$	—	$	241.5	$	(101.9)	$	(137.9)	$	1.7
Financial Liabilities:
Derivatives	$	74.0	$	—	$	74.0	$	(73.2)	$	—	$	0.8
Securities Lending	88.5		—		88.5		(88.5)		—		—
Total	$	162.5	$	—	$	162.5	$	(161.7)	$	—	$	0.8

Net Investment Income

Net investment income reported in our consolidated statements of income is presented below.

	Three Months Ended September 30				Nine Months Ended September 30
	2023		2022		2023		2022
	(in millions of dollars)
Fixed Maturity Securities	$	457.9	$	456.7	$	1,383.7	$	1,379.9
Derivatives	11.6		14.9		34.5		45.1
Mortgage Loans	22.9		24.7		69.8		77.6
Policy Loans	5.4		5.1		15.6		14.8
Other Long-term Investments
Perpetual Preferred Securities1	0.4		1.1		2.2		3.2
Private Equity Partnerships2	22.6		12.6		56.7		98.6
Other	2.6		3.6		7.1		7.4
Short-term Investments	19.1		5.9		49.4		9.2
Gross Investment Income	542.5		524.6		1,619.0		1,635.8
Less Investment Expenses	13.5		10.0		44.0		29.1
Less Investment Income on Participation Fund Account Assets	3.0		3.0		9.1		8.9
Net Investment Income	$	526.0	$	511.6	$	1,565.9	$	1,597.8

1The net unrealized gain (loss) recognized in net investment income for the three and nine months ended September 30, 2023 related to perpetual preferred securities still held at September 30, 2023 was $(0.4) million and $0.1 million, respectively. The net unrealized gain (loss) recognized in net investment income for the three and nine months ended September 30, 2022 related to perpetual preferred securities still held at September 30, 2022 was $0.5 million and $1.5 million, respectively.

2The net unrealized gain recognized in net investment income for the three and nine months ended September 30, 2023 related to private equity partnerships still held at September 30, 2023 was $29.7 million and $72.6 million, respectively, reduced by net management fees and partnership expenses of $(7.1) million and $(15.9) million, respectively. The net unrealized gain recognized in net investment income for the three and nine months ended September 30, 2022 related to private equity partnerships still held at September 30, 2022 was $14.3 million and $106.8 million, respectively, reduced by net management fees and partnership expenses of $(1.8) million and $(8.3) million, respectively. See Note 3 for further discussion of private equity partnerships.

Investment Gains and Losses Reported in Consolidated Statements of Income

Investment gains and losses are as follows:

	Three Months Ended September 30				Nine Months Ended September 30
	2023		2022		2023		2022
	(in millions of dollars)
Fixed Maturity Securities
Gross Gains on Sales	$	0.4	$	—	$	3.7	$	0.8
Gross Losses on Sales	(37.4)		(13.4)		(50.7)		(26.4)
Credit Losses	—		(0.5)		—		(4.6)
Mortgage Loans and Other Invested Assets
Gross Gains on Sales	—		—		6.0		1.4
Gross Losses on Sales	(0.9)		—		(1.0)		—
Impairment Loss	(3.0)		—		(3.0)		—
Change in Allowance for Credit Losses	0.9		(0.4)		(0.9)		(0.3)
Embedded Derivative in Modified Coinsurance Arrangement	9.2		14.9		14.7		10.7
All Other Derivatives	2.0		(0.9)		2.0		4.6
Foreign Currency Transactions	(2.2)		(4.1)		(0.8)		(8.5)
Net Investment Gain (Loss)	$	(31.0)	$	(4.4)	$	(30.0)	$	(22.3)

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Derivative Financial Instruments (Tables)

9 Months Ended

Sep. 30, 2023

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Nature and Amount of Collateral Received From and Posted To Derivative Counterparty

The table below summarizes the nature and amount of collateral received from and posted to our derivative counterparties.

	September 30, 2023		December 31, 2022
	(in millions of dollars)
Carrying Value of Collateral Received from Counterparties
Cash	$	—	$	49.4
Fixed Maturity Securities	17.8		—
	$	17.8	$	49.4
Carrying Value of Collateral Posted to Counterparties
Cash	$	4.6	$	5.1
Fixed Maturity Securities	166.0		39.6
	$	170.6	$	44.7

Fair Value Hedges Carrying Amount of Hedged Assets and Liabilities and Cumulative Basis Adjustments

The following table summarizes the carrying amount of hedged assets and the related cumulative basis adjustments related to our fair value hedges:

	Carrying Amount of Hedged Assets				Cumulative Amount of Fair Value Hedging Adjustment Included in the Carrying Amount of the Hedged Assets
	September 30, 2023		December 31, 2022		September 30, 2023		December 31, 2022
	(in millions of dollars)
Fixed maturity securities:
Receive fixed functional currency interest, pay fixed foreign currency interest	$	429.0	$	394.4	$	(33.5)	$	(24.8)

Location and Fair Values of Derivative Financial Instruments

The following tables summarize the notional amounts and fair values of derivative financial instruments, as reported in our consolidated balance sheets. Derivative assets are included in other long-term investments, while derivative liabilities are included in other liabilities within our consolidated balance sheets. The notional amounts represent the basis upon which our counterparty pay and receive amounts are calculated.

	September 30, 2023
			Derivative Assets		Derivative Liabilities
	Notional Amount		Fair Value		Fair Value
	(in millions of dollars)
Designated as Hedging Instruments
Cash Flow Hedges
Forward Benchmark Interest Rate Locks	$	1,290.0	$	—	$	184.1
Foreign Currency Interest Rate Swaps	156.4		16.7		2.5
Total Cash Flow Hedges	1,446.4		16.7		186.6
Fair Value Hedges
Foreign Currency Interest Rate Swaps	603.6		53.1		9.7
Total Designated as Hedging Instruments	$	2,050.0	$	69.8	$	196.3
Not Designated as Hedging Instruments
Foreign Currency Forwards	$	53.2	$	5.0	$	—
Foreign Currency Interest Rate Swaps	132.0		—		16.4
Total Return Swaps	89.0		—		—
Embedded Derivative in Modified Coinsurance Arrangement	—		0.9		—
Total Not Designated as Hedging Instruments	$	274.2	$	5.9	$	16.4
Total Derivatives	$	2,324.2	$	75.7	$	212.7

	December 31, 2022
			Derivative Assets		Derivative Liabilities
	Notional Amount		Fair Value		Fair Value
	(in millions of dollars)
Designated as Hedging Instruments
Cash Flow Hedges
Forward Benchmark Interest Rate Locks	$	764.0	$	1.6	$	48.4
Foreign Currency Interest Rate Swaps	168.9		17.5		3.1
Total Cash Flow Hedges	932.9		19.1		51.5
Fair Value Hedges
Foreign Currency Interest Rate Swaps	557.8		66.0		5.4
Total Designated as Hedging Instruments	$	1,490.7	$	85.1	$	56.9
Not Designated as Hedging Instruments
Foreign Currency Forwards	$	54.3	$	4.0	$	0.1
Foreign Currency Interest Rate Swaps	132.0		—		17.0
Total Return Swaps	76.9		—		—
Embedded Derivative in Modified Coinsurance Arrangement	—		—		13.9
Total Not Designated as Hedging Instruments	$	263.2	$	4.0	$	31.0
Total Derivatives	$	1,753.9	$	89.1	$	87.9

Location of Gains and Losses on Derivative Instruments Designated as Cash Flow Hedging Instruments

The following tables summarize the location of gains and losses of derivative financial instruments designated as hedging instruments, as reported in our consolidated statements of income.

	Three Months Ended September 30
	2023						2022
	Net Investment Income		Net Investment Gain (Loss)		Interest and Debt Expense		Net Investment Income		Net Investment Gain (Loss)		Interest and Debt Expense
	(in millions of dollars)
Total Income and Expense Presented in the Consolidated Statements of Income of Which Hedged Items are Recorded	$	526.0	$	(31.0)	$	48.6	$	511.6	$	(4.4)	$	47.0
Gain (Loss) on Cash Flow Hedging Relationships
Interest Rate Swaps:
Hedged items	49.7		—		0.7		50.2		—		0.7
Derivatives Designated as Hedging Instruments	8.3		—		—		14.1		—		—
Foreign Exchange Contracts:
Hedged items	2.3		(0.1)		—		2.7		(0.5)		—
Derivatives Designated as Hedging Instruments	0.4		—		—		(1.5)		—		—
Forward Benchmark Interest Rate Locks:
Hedged items	3.9		—		—		0.2		—		—
Derivatives Designated as Hedging Instruments	(0.1)		—		—		—		—		—
Gain (Loss) on Fair Value Hedging Relationships
Foreign Exchange Contracts
Hedged items	3.9		(15.2)		—		2.9		(29.6)		—
Derivatives Designated as Hedging Instruments	3.1		15.2		—		1.0		29.6		—

	Nine Months Ended September 30
	2023						2022
	Net Investment Income		Net Investment Gain (Loss)		Interest and Debt Expense		Net Investment Income		Net Investment Gain (Loss)		Interest and Debt Expense
	(in millions of dollars)
Total Income and Expense Presented in the Consolidated Statements of Income of Which Hedged Items are Recorded	$	1,565.9	$	(30.0)	$	145.6	$	1,597.8	$	(22.3)	$	141.3
Gain (Loss) on Cash Flow Hedging Relationships
Interest Rate Swaps:
Hedged items	148.2		0.8		2.2		150.9		—		2.1
Derivatives Designated as Hedging Instruments	27.7		—		—		40.5		—		—
Foreign Exchange Contracts:
Hedged items	7.3		(0.1)		—		8.3		(0.5)		—
Derivatives Designated as Hedging Instruments	0.6		0.1		—		(0.9)		—		—
Forward Benchmark Interest Rate Locks:
Hedged items	7.7		—		—		0.2		—		—
Derivatives Designated as Hedging Instruments	(0.1)		—		—		—		—		—
Gain (Loss) on Fair Value Hedging Relationships
Foreign Exchange Contracts
Hedged items	10.3		(8.7)		—		8.7		(62.5)		—
Derivatives Designated as Hedging Instruments	6.7		8.7		—		5.1		62.5		—

Schedule of Cash Flow Hedges Included in Accumulated Other Comprehensive Income (Loss)

The following table summarizes the location of gains and losses of derivative financial instruments designated as cash flow hedging instruments, as reported in our consolidated statements of comprehensive income (loss).

	Three Months Ended September 30				Nine Months Ended September 30
	2023		2022		2023		2022
	(in millions of dollars)
Gain (Loss) Recognized in Other Comprehensive Income (Loss) on Derivatives
Forwards	$	(158.9)	$	(34.3)	$	(159.7)	$	(32.0)
Foreign Exchange Contracts	3.4		7.1		0.7		11.4
Total	$	(155.5)	$	(27.2)	$	(159.0)	$	(20.6)

Gains and Losses on Derivatives Not Designated as Hedging Instruments

The following table summarizes the location of gains and losses on our derivatives not designated as hedging instruments, as reported in our consolidated statements of income.

	Three Months Ended September 30				Nine Months Ended September 30
	2023		2022		2023		2022
	(in millions of dollars)
Net Investment Gain (Loss)
Foreign Exchange Contracts	$	2.0	$	(0.9)	$	2.0	$	4.6
Embedded Derivative in Modified Coinsurance Arrangement	9.2		14.9		14.7		10.7
Total	$	11.2	$	14.0	$	16.7	$	15.3
Other Expenses
(Gain) Loss on Total Return Swaps	$	4.1	$	4.3	$	(4.7)	$	23.0

XML

Accumulated Other Comprehensive Income (Loss) (Tables)

9 Months Ended

Sep. 30, 2023

Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]

Schedule of Accumulated Other Comprehensive Income (Loss)

Components of our accumulated other comprehensive loss, after tax, and related changes are as follows:

	Net Unrealized Gain (Loss) on Securities		Effect of Change in Discount Rate Assumptions on the LFPB1		Net Gain (Loss) on Hedges		Foreign Currency Translation Adjustment		Unrecognized Pension and Postretirement Benefit Costs		Total
	(in millions of dollars)
Balance at June 30, 2023	$	(2,762.6)	$	0.1	$	(33.3)	$	(327.1)	$	(334.7)	$	(3,457.6)
Other Comprehensive Income (Loss) Before Reclassifications	(1,215.1)		1,688.4		(137.9)		(55.1)		2.5		282.8
Amounts Reclassified from Accumulated Other Comprehensive Income or Loss	29.3		—		(6.5)		—		1.4		24.2
Net Other Comprehensive Income (Loss)	(1,185.8)		1,688.4		(144.4)		(55.1)		3.9		307.0
Balance at September 30, 2023	$	(3,948.4)	$	1,688.5	$	(177.7)	$	(382.2)	$	(330.8)	$	(3,150.6)
Balance at June 30, 2022	$	(1,560.4)	$	(1,541.2)	$	46.4	$	(367.5)	$	(386.8)	$	(3,809.5)
Other Comprehensive Income (Loss) Before Reclassifications	(1,937.0)		2,222.9		(23.0)		(71.5)		2.8		194.2
Amounts Reclassified from Accumulated Other Comprehensive Income or Loss	11.1		—		(9.9)		—		3.1		4.3
Net Other Comprehensive Income (Loss)	(1,925.9)		2,222.9		(32.9)		(71.5)		5.9		198.5
Balance at September 30, 2022	$	(3,486.3)	$	681.7	$	13.5	$	(439.0)	$	(380.9)	$	(3,611.0)
Balance at December 31, 2022	$	(3,028.4)	$	313.9	$	(9.6)	$	(390.1)	$	(334.1)	$	(3,448.3)
Other Comprehensive Income (Loss) Before Reclassifications	(957.2)		1,374.6		(146.4)		7.9		(0.9)		278.0
Amounts Reclassified from Accumulated Other Comprehensive Income or Loss	37.2		—		(21.7)		—		4.2		19.7
Net Other Comprehensive Income (Loss)	(920.0)		1,374.6		(168.1)		7.9		3.3		297.7
Balance at September 30, 2023	$	(3,948.4)	$	1,688.5	$	(177.7)	$	(382.2)	$	(330.8)	$	(3,150.6)
Balance at December 31, 2021	$	4,014.4	$	(8,570.7)	$	61.8	$	(274.1)	$	(396.0)	$	(5,164.6)
Other Comprehensive Income (Loss) Before Reclassifications	(7,524.6)		9,252.4		(17.1)		(164.9)		5.9		1,551.7
Amounts Reclassified from Accumulated Other Comprehensive Income or Loss	23.9		—		(31.2)		—		9.2		1.9
Net Other Comprehensive Income (Loss)	(7,500.7)		9,252.4		(48.3)		(164.9)		15.1		1,553.6
Balance at September 30, 2022	$	(3,486.3)	$	681.7	$	13.5	$	(439.0)	$	(380.9)	$	(3,611.0)
1Liability for Future Policy Benefits

Schedule of Reclassification out of Accumulated Other Comprehensive Income (Loss)

Amounts reclassified from accumulated other comprehensive loss were recognized in our consolidated statements of income as follows:

	Three Months Ended September 30				Nine Months Ended September 30
	2023		2022		2023		2022
	(in millions of dollars)
Net Unrealized Loss on Securities
Net Investment Loss
Net Loss on Sales of Fixed Maturity Securities	$	(37.0)	$	(13.4)	$	(47.0)	$	(25.6)
Credit Losses on Fixed Maturity Securities	—		(0.5)		—		(4.6)
	(37.0)		(13.9)		(47.0)		(30.2)
Income Tax Benefit	(7.7)		(2.8)		(9.8)		(6.3)
Total	$	(29.3)	$	(11.1)	$	(37.2)	$	(23.9)
Net Gain (Loss) on Hedges
Net Investment Income
Gain on Interest Rate Swaps and Forwards	$	8.3	$	14.1	$	27.6	$	40.5
Loss on Foreign Exchange Contracts	(0.1)		(1.5)		(0.2)		(1.0)
Net Investment Gain
Gain on Foreign Exchange Contracts	—		—		0.1		—
	8.2		12.6		27.5		39.5
Income Tax Expense	1.7		2.7		5.8		8.3
Total	$	6.5	$	9.9	$	21.7	$	31.2
Unrecognized Pension and Postretirement Benefit Costs
Other Expenses
Amortization of Net Actuarial Loss	$	(1.8)	$	(4.0)	$	(5.4)	$	(11.8)
Amortization of Prior Service Credit	—		0.1		0.1		0.2
	(1.8)		(3.9)		(5.3)		(11.6)
Income Tax Benefit	(0.4)		(0.8)		(1.1)		(2.4)
Total	$	(1.4)	$	(3.1)	$	(4.2)	$	(9.2)

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Liability for Future Policy Benefits, Policyholder's Account Balances, and Deferred Acquisition Costs (Tables)

9 Months Ended

Sep. 30, 2023

Insurance [Abstract]

Liability for Future Policy Benefit, Activity

The following table presents balances as well as the changes in the liability for future policy benefits for traditional long duration products.

	Consolidated
	September 30
	2023		2022
	(in millions of dollars)
Present Value of Expected Net Premiums
Balance, beginning of year	$	12,426.2	$	15,881.3
Beginning balance at original discount rate	12,695.3		13,186.2
Effect of changes in cash flow assumptions	1,499.2		(101.9)
Effect of actual variances from expected experience	(121.8)		(252.3)
Adjusted beginning of year balance	14,072.7		12,832.0
Issuances	861.2		727.2
Interest accretion	430.8		430.0
Net premiums collected	(1,164.9)		(1,184.1)
Foreign currency	(0.1)		(49.5)
Ending balance at original discount rate	14,199.7		12,755.6
Effect of change in discount rate assumptions	(709.0)		(418.5)
Balance, end of period	$	13,490.7	$	12,337.1
Present Value of Expected Future Policy Benefits
Balance, beginning of year	$	48,929.4	$	65,305.0
Beginning balance at original discount rate	49,689.0		50,397.2
Effect of changes in cash flow assumptions	1,702.0		(92.4)
Effect of actual variances from expected experience	(356.4)		(459.6)
Adjusted beginning of year balance	51,034.6		49,845.2
Issuances1	2,547.0		2,602.7
Interest accretion	1,670.3		1,689.3
Benefit payments	(4,106.1)		(4,112.1)
Foreign currency	19.6		(485.7)
Ending balance at original discount rate	51,165.4		49,539.4
Effect of change in discount rate assumptions	(3,111.7)		(1,484.8)
Balance, end of period	$	48,053.7	$	48,054.6
Net liability for future policy benefits	$	34,563.0	$	35,717.5
Other	1,703.3		1,872.7
Total liability for future policy benefits	36,266.3		37,590.2
Less: Reinsurance recoverable related to future policy benefits	7,449.0		8,154.6
Net liability for future policy benefits, after reinsurance recoverable	$	28,817.3	$	29,435.6
1Issuances include new policy issuances for most product lines. For our Unum US group disability, Unum US group life and AD&D and Closed Block - All Other product lines and certain of our Unum International product lines, this line represents new claim incurrals.

The following tables summarize the amount of gross premiums and interest accretion reflected in the statements of income as well as the undiscounted and discounted expected gross premiums and expected future benefit payments and the weighted average interest rates for traditional long duration products presented in the rollforward activity above.

	Consolidated
	Nine Months Ended September 30
	2023		2022
	(in millions of dollars)
Amount recognized in the statement of income:
Gross premiums or assessments	$	7,278.4	$	7,033.8
Interest accretion	$	1,239.5	$	1,259.3

	Consolidated
	September 30
	2023			2022
	(in millions of dollars, except weighted average data)
Amount of undiscounted:
Expected future benefit payments	$	105,306.1		$	97,202.5
Expected future gross premiums	$	38,581.4		$	35,301.8
Amount of discounted (at interest accretion rate):
Expected future gross premiums	$	25,435.2		$	23,835.8
Weighted average interest rate:
Interest accretion rate	4.8		%	4.8		%
Current discount rate	5.6		%	5.2		%
Weighted average duration of the liability	11.5 years			11.0 years

The following table presents the balances and changes in the reserves for future policy benefits for traditional long duration products in the Unum US segment.

	September 30, 2023
	Group Disability		Group Life and AD&D		Voluntary Benefits		Individual Disability		Total Unum US
	(in millions of dollars)
Present Value of Expected Net Premiums
Balance, beginning of year	$	—	$	—	$	868.2	$	1,202.9	$	2,071.1
Beginning balance at original discount rate	—		—		937.9		1,228.1		2,166.0
Effect of changes in cash flow assumptions	—		—		180.7		5.0		185.7
Effect of actual variances from expected experience	—		—		(98.2)		(13.6)		(111.8)
Adjusted beginning of year balance	—		—		1,020.4		1,219.5		2,239.9
Issuances	—		—		258.6		164.0		422.6
Interest accretion	—		—		21.4		36.3		57.7
Net premiums collected	—		—		(124.2)		(131.7)		(255.9)
Ending balance at original discount rate	—		—		1,176.2		1,288.1		2,464.3
Effect of change in discount rate assumptions	—		—		(119.4)		(62.2)		(181.6)
Balance, end of period	$	—	$	—	$	1,056.8	$	1,225.9	$	2,282.7
Present Value of Expected Future Policy Benefits
Balance, beginning of year	$	5,533.3	$	972.6	$	1,999.5	$	3,192.8	$	11,698.2
Beginning balance at original discount rate	5,793.1		998.5		2,141.2		3,244.5		12,177.3
Effect of changes in cash flow assumptions	(100.2)		—		170.1		7.9		77.8
Effect of actual variances from expected experience	(187.8)		(28.2)		(109.6)		(42.3)		(367.9)
Adjusted beginning of year balance	5,505.1		970.3		2,201.7		3,210.1		11,887.2
Issuances1	907.1		356.1		270.4		173.8		1,707.4
Interest accretion	137.6		15.8		64.3		123.2		340.9
Benefit payments	(1,186.8)		(402.1)		(143.9)		(203.5)		(1,936.3)
Ending balance at original discount rate	5,363.0		940.1		2,392.5		3,303.6		11,999.2
Effect of change in discount rate assumptions	(310.1)		(35.6)		(280.7)		(190.0)		(816.4)
Balance, end of period	$	5,052.9	$	904.5	$	2,111.8	$	3,113.6	$	11,182.8
Net liability for future policy benefits	$	5,052.9	$	904.5	$	1,055.0	$	1,887.7	$	8,900.1
Other	0.5		1.0		2.4		26.0		29.9
Total liability for future policy benefits	5,053.4		905.5		1,057.4		1,913.7		8,930.0
Less: Reinsurance recoverable related to future policy benefits	32.8		6.2		13.2		148.1		200.3
Net liability for future policy benefits, after reinsurance recoverable	$	5,020.6	$	899.3	$	1,044.2	$	1,765.6	$	8,729.7
1Issuances include new policy issuances for most product lines. Issuances for Unum US group disability and Unum US group life and AD&D represents new claim incurrals.

	September 30, 2022
	Group Disability		Group Life and AD&D		Voluntary Benefits		Individual Disability		Total Unum US
	(in millions of dollars)
Present Value of Expected Net Premiums
Balance, beginning of year	$	—	$	—	$	1,124.8	$	1,494.3	$	2,619.1
Beginning balance at original discount rate	—		—		1,032.3		1,279.6		2,311.9
Effect of changes in cash flow assumptions	—		—		(23.4)		(73.7)		(97.1)
Effect of actual variances from expected experience	—		—		(79.7)		(37.4)		(117.1)
Adjusted beginning of year balance	—		—		929.2		1,168.5		2,097.7
Issuances	—		—		126.0		123.5		249.5
Interest accretion	—		—		22.3		38.2		60.5
Net premiums collected	—		—		(128.6)		(130.5)		(259.1)
Ending balance at original discount rate	—		—		948.9		1,199.7		2,148.6
Effect of change in discount rate assumptions	—		—		(79.4)		(37.2)		(116.6)
Balance, end of period	$	—	$	—	$	869.5	$	1,162.5	$	2,032.0
Present Value of Expected Future Policy Benefits
Balance, beginning of year	$	6,725.7	$	1,124.1	$	2,697.3	$	4,017.3	$	14,564.4
Beginning balance at original discount rate	6,158.3		1,058.3		2,201.8		3,253.3		12,671.7
Effect of changes in cash flow assumptions	(102.0)		(32.9)		(39.9)		(53.4)		(228.2)
Effect of actual variances from expected experience	(174.1)		(29.0)		(82.3)		(43.1)		(328.5)
Adjusted beginning of year balance	5,882.2		996.4		2,079.6		3,156.8		12,115.0
Issuances1	1,038.9		377.5		140.5		131.1		1,688.0
Interest accretion	162.2		18.8		65.2		116.9		363.1
Benefit payments	(1,228.7)		(424.1)		(147.5)		(192.8)		(1,993.1)
Ending balance at original discount rate	5,854.6		968.6		2,137.8		3,212.0		12,173.0
Effect of change in discount rate assumptions	(284.6)		(32.5)		(167.5)		(95.7)		(580.3)
Balance, end of period	$	5,570.0	$	936.1	$	1,970.3	$	3,116.3	$	11,592.7
Net liability for future policy benefits	$	5,570.0	$	936.1	$	1,100.8	$	1,953.8	$	9,560.7
Other	0.5		0.9		15.1		24.7		41.2
Total liability for future policy benefits	5,570.5		937.0		1,115.9		1,978.5		9,601.9
Less: Reinsurance recoverable related to future policy benefits	36.8		6.0		23.4		189.7		255.9
Net liability for future policy benefits, after reinsurance recoverable	$	5,533.7	$	931.0	$	1,092.5	$	1,788.8	$	9,346.0
1Issuances include new policy issuances for most product lines. Issuances for Unum US group disability and Unum US group life and AD&D represents new claim incurrals.

The following tables summarize the amount of gross premiums and interest accretion reflected in the statements of income as well as the undiscounted and discounted expected gross premiums and expected future benefit payments and the weighted average interest rates for traditional long duration products in the Unum US segment presented in the rollforward activity above.

	Nine Months Ended September 30, 2023
	Group Disability		Group Life and AD&D		Voluntary Benefits		Individual Disability		Total Unum US
	(in millions of dollars)
Amount recognized in the statement of income:
Gross premiums or assessments	$	2,210.4	$	1,403.2	$	592.1	$	474.2	$	4,679.9
Interest accretion	$	137.6	$	15.8	$	42.9	$	86.9	$	283.2

	Nine Months Ended September 30, 2022
	Group Disability		Group Life and AD&D		Voluntary Benefits		Individual Disability		Total Unum US
	(in millions of dollars)
Amount recognized in the statement of income:
Gross premiums or assessments	$	2,073.5	$	1,396.0	$	583.1	$	446.9	$	4,499.5
Interest accretion	$	162.2	$	18.8	$	42.9	$	78.7	$	302.6

	September 30, 2023
	Group Disability			Group Life and AD&D			Voluntary Benefits			Individual Disability			Total Unum US
	(in millions of dollars, except weighted average data)
Amount of undiscounted:
Expected future benefit payments	$	6,474.2		$	1,069.2		$	5,107.4		$	5,292.7		$	17,943.5
Expected future gross premiums	$	—		$	—		$	5,317.5		$	5,701.8		$	11,019.3
Amount of discounted (at interest accretion rate):
Expected future gross premiums	$	—		$	—		$	3,663.8		$	4,099.5		$	7,763.3
Weighted average interest rate:
Interest accretion rate	4.0		%	2.3		%	5.0		%	5.1		%	4.2		%
Current discount rate	5.4		%	3.1		%	5.7		%	5.7		%	5.3		%
Weighted average duration of the liability	4.3 years			2.7 years			18.2 years			9.6 years			6.9 years

	September 30, 2022
	Group Disability			Group Life and AD&D			Voluntary Benefits			Individual Disability			Total Unum US
	(in millions of dollars, except weighted average data)
Amount of undiscounted:
Expected future benefit payments	$	7,077.3		$	1,124.5		$	4,555.1		$	5,112.5		$	17,869.4
Expected future gross premiums	$	—		$	—		$	4,006.6		$	5,461.8		$	9,468.4
Amount of discounted (at interest accretion rate):
Expected future gross premiums	$	—		$	—		$	2,970.1		$	3,916.2		$	6,886.3
Weighted average interest rate:
Interest accretion rate	3.8		%	2.4		%	5.1		%	5.1		%	4.1%
Current discount rate	5.0		%	3.1		%	5.3		%	5.2		%	4.9%
Weighted average duration of the liability	4.4 years			3.1 years			18.0 years			9.4 years			6.8 years

The following table presents the balances and changes in the reserves for future policy benefits for traditional long duration products in the Unum International segment.

	September 30
	2023		2022
	(in millions of dollars)
Present Value of Expected Net Premiums
Balance, beginning of year	$	197.1	$	260.5
Beginning balance at original discount rate	246.8		258.1
Effect of changes in cash flow assumptions	(5.1)		(0.3)
Effect of actual variances from expected experience	12.2		5.4
Adjusted beginning of year balance	253.9		263.2
Issuances	16.9		13.4
Interest accretion	6.9		6.5
Net premiums collected	(16.9)		(17.3)
Foreign currency	(0.1)		(49.5)
Ending balance at original discount rate	260.7		216.3
Effect of change in discount rate assumptions	(37.6)		(46.9)
Balance, end of period	$	223.1	$	169.4
Present Value of Expected Future Policy Benefits
Balance, beginning of year	$	2,231.4	$	3,181.8
Beginning balance at original discount rate	2,495.5		2,703.8
Effect of changes in cash flow assumptions	17.7		(20.1)
Effect of actual variances from expected experience	(9.2)		23.5
Adjusted beginning of year balance	2,504.0		2,707.2
Issuances1	277.3		287.9
Interest accretion	47.7		50.0
Benefit payments	(307.5)		(270.3)
Foreign currency	19.6		(485.7)
Ending balance at original discount rate	2,541.1		2,289.1
Effect of change in discount rate assumptions	(297.1)		(345.4)
Balance, end of period	$	2,244.0	$	1,943.7
Net liability for future policy benefits	$	2,020.9	$	1,774.3
Other	30.3		24.9
Total liability for future policy benefits	2,051.2		1,799.2
Less: Reinsurance recoverable related to future policy benefits	69.4		57.8
Net liability for future policy benefits, after reinsurance recoverable	$	1,981.8	$	1,741.4
1Issuances for Unum International primarily represents new claim incurrals.

The following tables summarize the amount of gross premiums and interest accretion reflected in the statements of income as well as the undiscounted and discounted expected gross premiums and expected future benefit payments and the weighted average interest rates for traditional long duration products in the Unum International segment presented in the rollforward activity above.

	Nine Months Ended September 30
	2023		2022
	(in millions of dollars)
Amount recognized in the statement of income:
Gross premiums or assessments	$	667.7	$	590.4
Interest accretion	$	40.8	$	43.5

	September 30
	2023			2022
	(in millions of dollars, except weighted average data)
Amount of undiscounted:
Expected future benefit payments	$	4,012.8		$	3,642.0
Expected future gross premiums	$	1,035.7		$	814.9
Amount of discounted (at interest accretion rate):
Expected future gross premiums	$	676.8		$	545.1
Weighted average interest rate:
Interest accretion rate	4.0		%	3.9		%
Current discount rate	5.4		%	5.9		%
Weighted average duration of the liability	8.6 years			8.5 years

The following table presents the balances and changes in the reserves for future policy benefits for traditional long duration products in the Colonial Life segment.

	September 30
	2023		2022
	(in millions of dollars)
Present Value of Expected Net Premiums
Balance, beginning of year	$	3,745.4	$	4,597.0
Beginning balance at original discount rate	4,046.4		4,158.9
Effect of changes in cash flow assumptions	(322.7)		(32.3)
Effect of actual variances from expected experience	(77.1)		(105.8)
Adjusted beginning of year balance	3,646.6		4,020.8
Issuances	421.7		464.3
Interest accretion	94.3		99.4
Net premiums collected	(454.0)		(483.6)
Ending balance at original discount rate	3,708.6		4,100.9
Effect of change in discount rate assumptions	(348.7)		(353.2)
Balance, end of period	$	3,359.9	$	3,747.7
Present Value of Expected Future Policy Benefits
Balance, beginning of year	$	5,581.1	$	7,054.8
Beginning balance at original discount rate	6,163.9		6,201.5
Effect of changes in cash flow assumptions	(402.9)		(85.9)
Effect of actual variances from expected experience	(90.1)		(133.4)
Adjusted beginning of year balance	5,670.9		5,982.2
Issuances	461.1		502.9
Interest accretion	161.0		165.1
Benefit payments	(462.1)		(467.4)
Ending balance at original discount rate	5,830.9		6,182.8
Effect of change in discount rate assumptions	(731.9)		(667.5)
Balance, end of period	$	5,099.0	$	5,515.3
Net liability for future policy benefits	$	1,739.1	$	1,767.6
Other	24.3		23.9
Total liability for future policy benefits	1,763.4		1,791.5
Less: Reinsurance recoverable related to future policy benefits	0.9		1.3
Net liability for future policy benefits, after reinsurance recoverable	$	1,762.5	$	1,790.2

The following tables summarize the amount of gross premiums and interest accretion reflected in the statements of income as well as the undiscounted and discounted expected gross premiums and expected future benefit payments and the weighted average interest rates for traditional long duration products in the Colonial Life segment presented in the rollforward activity above.

	Nine Months Ended September 30
	2023		2022
	(in millions of dollars)
Amount recognized in the statement of income:
Gross premiums or assessments	$	1,240.3	$	1,228.3
Interest accretion	$	66.7	$	65.7

	September 30
	2023			2022
	(in millions of dollars, except weighted average data)
Amount of undiscounted:
Expected future benefit payments	$	9,568.2		$	9,984.0
Expected future gross premiums	$	11,847.5		$	12,205.8
Amount of discounted (at interest accretion rate):
Expected future gross premiums	$	8,684.1		$	8,996.4
Weighted average interest rate:
Interest accretion rate	4.3		%	4.4		%
Current discount rate	5.7		%	5.3		%
Weighted average duration of the liability	16.9 years			17.9 years

The following table presents the balances and changes in the reserves for future policy benefits for traditional long duration products in the Closed Block segment.

	September 30, 2023
	Long-term Care		All Other		Total Closed Block
	(in millions of dollars)
Present Value of Expected Net Premiums
Balance, beginning of year	$	6,412.6	$	—	$	6,412.6
Beginning balance at original discount rate	6,236.1		—		6,236.1
Effect of changes in cash flow assumptions	1,641.3		—		1,641.3
Effect of actual variances from expected experience	54.9		—		54.9
Adjusted beginning of year balance	7,932.3		—		7,932.3
Interest accretion	271.9		—		271.9
Net premiums collected	(438.1)		—		(438.1)
Ending balance at original discount rate	7,766.1		—		7,766.1
Effect of change in discount rate assumptions	(141.1)		—		(141.1)
Balance, end of period	$	7,625.0	$	—	$	7,625.0
Present Value of Expected Future Policy Benefits
Balance, beginning of year	$	21,199.9	$	8,218.8	$	29,418.7
Beginning balance at original discount rate	20,221.6		8,630.7		28,852.3
Effect of changes in cash flow assumptions	2,009.4		—		2,009.4
Effect of actual variances from expected experience	106.7		4.1		110.8
Adjusted beginning of year balance	22,337.7		8,634.8		30,972.5
Issuances1	—		101.2		101.2
Interest accretion	850.7		270.0		1,120.7
Benefit payments	(624.2)		(776.0)		(1,400.2)
Ending balance at original discount rate	22,564.2		8,230.0		30,794.2
Effect of change in discount rate assumptions	(579.3)		(687.0)		(1,266.3)
Balance, end of period	$	21,984.9	$	7,543.0	$	29,527.9
Net liability for future policy benefits	$	14,359.9	$	7,543.0	21,902.9
Other2	12.8		1,606.0		1,618.8
Total liability for future policy benefits	14,372.7		9,149.0		23,521.7
Less: Reinsurance recoverable related to future policy benefits	4.6		7,173.7		7,178.3
Net liability for future policy benefits, after reinsurance recoverable	$	14,368.1	$	1,975.3	$	16,343.4
1Issuances for Closed Block - All Other represents new claim incurrals.
2Other for Closed Block - All Other primarily includes our closed block group pension products and certain of our ceded closed block individual life products.

	September 30, 2022
	Long-term Care		All Other		Total Closed Block
	(in millions of dollars)
Present Value of Expected Net Premiums
Balance, beginning of year	$	8,404.7	$	—	$	8,404.7
Beginning balance at original discount rate	6,457.3		—		6,457.3
Effect of changes in cash flow assumptions	27.8		—		27.8
Effect of actual variances from expected experience	(34.8)		—		(34.8)
Adjusted beginning of year balance	6,450.3		—		6,450.3
Interest accretion	263.6		—		263.6
Net premiums collected	(424.1)		—		(424.1)
Ending balance at original discount rate	6,289.8		—		6,289.8
Effect of change in discount rate assumptions	98.2		—		98.2
Balance, end of period	$	6,388.0	$	—	$	6,388.0
Present Value of Expected Future Policy Benefits
Balance, beginning of year	$	30,089.6	$	10,414.4	$	40,504.0
Beginning balance at original discount rate	19,870.8		8,949.4		28,820.2
Effect of changes in cash flow assumptions	24.9		216.9		241.8
Effect of actual variances from expected experience	(39.3)		18.1		(21.2)
Adjusted beginning of year balance	19,856.4		9,184.4		29,040.8
Issuances1	—		123.9		123.9
Interest accretion	829.7		281.4		1,111.1
Benefit payments	(548.7)		(832.6)		(1,381.3)
Ending balance at original discount rate	20,137.4		8,757.1		28,894.5
Effect of change in discount rate assumptions	629.6		(521.2)		108.4
Balance, end of period	$	20,767.0	$	8,235.9	$	29,002.9
Net liability for future policy benefits	$	14,379.0	$	8,235.9	$	22,614.9
Other2	22.8		1,759.9		1,782.7
Total liability for future policy benefits	14,401.8		9,995.8		24,397.6
Less: Reinsurance recoverable related to future policy benefits	5.3		7,834.2		7,839.5
Net liability for future policy benefits, after reinsurance recoverable	$	14,396.5	$	2,161.6	$	16,558.1
1Issuances for Closed Block - All Other represents new claim incurrals.
2Other for Closed Block - All Other primarily includes our closed block group pension products and certain of our ceded closed block individual life products.

The following tables summarize the amount of gross premiums and interest accretion reflected in the statements of income as well as the undiscounted and discounted expected gross premiums and expected future benefit payments and the weighted average interest rates for traditional long duration products in the Closed Block segment presented in the rollforward activity above.

	Nine Months Ended September 30, 2023
	Long-term Care		All Other		Total Closed Block
	(in millions of dollars)
Amount recognized in the statement of income:
Gross premiums or assessments	$	521.2	$	169.3	$	690.5
Interest accretion	$	578.8	$	270.0	$	848.8

	Nine Months Ended September 30, 2022
	Long-term Care		All Other		Total Closed Block
	(in millions of dollars)
Amount recognized in the statement of income:
Gross premiums or assessments	$	523.0	$	192.6	$	715.6
Interest accretion	$	566.1	$	281.4	$	847.5

	September 30, 2023
	Long-term Care			All Other			Total Closed Block
	(in millions of dollars, except weighted average data)
Amount of undiscounted:
Expected future benefit payments	$	61,672.0		$	12,109.6		$	73,781.6
Expected future gross premiums	$	14,678.9		$	—		$	14,678.9
Amount of discounted (at interest accretion rate):
Expected future gross premiums	$	8,311.0		$	—		$	8,311.0
Weighted average interest rate:
Interest accretion rate	5.6		%	4.6		%	5.2		%
Current discount rate	5.8%			5.7		%	5.8		%
Weighted average duration of the liability	16.6 years			7.3 years			13.3 years

	September 30, 2022
	Long-term Care			All Other			Total Closed Block
	(in millions of dollars, except weighted average data)
Amount of undiscounted:
Expected future benefit payments	$	52,756.7		$	12,950.4		$	65,707.1
Expected future gross premiums	$	12,812.7		$	—		$	12,812.7
Amount of discounted (at interest accretion rate):
Expected future gross premiums	$	7,408.0		$	—		$	7,408.0
Weighted average interest rate:
Interest accretion rate	5.5		%	4.6		%	5.2%
Current discount rate	5.3		%	5.3		%	5.3%
Weighted average duration of the liability	15.7 years			7.4 years			12.5 years

A reconciliation of the liability for future policy benefits reflected in the preceding rollforwards to the related liability balances in the consolidated balance sheets are as follows:

	September 30
	2023		2022
	(in millions of dollars)
Liability for future policy benefits
Unum US1	$	8,930.0	$	9,601.9
Unum International	2,051.2		1,799.2
Colonial Life	1,763.4		1,791.5
Closed Block1	23,521.7		24,397.6
Other products1	236.1		217.8
Total liability for future policy benefits	$	36,502.4	$	37,808.0

1Unum US excludes dental & vision and medical stop-loss product lines and Closed Block excludes our participating fund account, which represents policies issued by one of our subsidiaries prior to its 1986 conversion from a mutual stock life insurance company. The liabilities associated with these products are included within Other products.

Policyholder Account Balance

The following table presents the balances and changes in the policyholders' account balances:

	September 30, 2023
	Unum US - Voluntary Benefits		Colonial Life		Closed Block - All Other		Total
	(in millions of dollars, except weighted average data)
Balance, beginning of year	$	586.8	$	852.4	$	4,159.4	$	5,598.6
Premiums received	44.9		64.4		25.2		134.5
Policy charges1	(45.8)		(56.3)		(78.9)		(181.0)
Surrenders and withdrawals	(23.6)		(28.5)		(12.1)		(64.2)
Benefit payments	(7.5)		(5.6)		(191.0)		(204.1)
Interest credited	17.0		25.7		239.0		281.7
Other	6.7		(0.2)		24.3		30.8
Balance, end of period	578.5		851.9		4,165.9		5,596.3
Reserves in excess of account balance	99.2		16.6		32.4		148.2
Total policyholders' account balances	677.7		868.5		4,198.3		5,744.5
Less: Reinsurance recoverable related to policyholders' account balances	1.0		—		4,198.3		4,199.3
Net policyholders' account balances, after reinsurance recoverable	$	676.7	$	868.5	$	—	$	1,545.2
Weighted average crediting rate	4.0%		4.1%		8.0%		6.9%
Net amount at risk2	$	4,600.0	$	8,901.6	$	1,807.1	$	15,308.7
Cash surrender value	$	568.9	$	810.1	$	4,033.4	$	5,412.4
1Contracts included in the policyholder account balances are generally charged a premium and/or monthly assessments on the basis of the account balance.
2For those guarantees of benefits that are payable in the event of death, the net amount at risk is generally defined as the current guaranteed minimum death benefit in excess of the current account balance at the balance sheet date.

	September 30, 2022
	Unum US - Voluntary Benefits		Colonial Life		Closed Block - All Other		Total
	(in millions of dollars, except weighted average data)
Balance, beginning of year	$	598.7	$	849.2	$	4,231.7	$	5,679.6
Premiums received	49.2		68.8		25.1		143.1
Policy charges1	(48.8)		(58.9)		(77.0)		(184.7)
Surrenders and withdrawals	(25.6)		(27.9)		(18.7)		(72.2)
Benefit payments	(8.0)		(6.0)		(189.3)		(203.3)
Interest credited	17.8		25.6		232.9		276.3
Other	5.8		0.1		30.2		36.1
Balance, end of period	589.1		850.9		4,234.9		5,674.9
Reserves in excess of account balance	89.4		17.5		31.0		137.9
Total policyholders' account balances	678.5		868.4		4,265.9		5,812.8
Less: Reinsurance recoverable related to policyholders' account balances	1.0		0.1		4,265.9		4,267.0
Net policyholders' account balances, after reinsurance recoverable	$	677.5	$	868.3	$	—	$	1,545.8
Weighted average crediting rate	4.1%		4.1%		7.6%		6.7%
Net amount at risk2	$	5,008.7	$	9,490.5	$	1,920.1	$	16,419.3
Cash surrender value	$	585.4	$	796.8	$	4,093.2	$	5,475.4
1Contracts included in the policyholder account balances are generally charged a premium and/or monthly assessments on the basis of the account balance.
2For those guarantees of benefits that are payable in the event of death, the net amount at risk is generally defined as the current guaranteed minimum death benefit in excess of the current account balance at the balance sheet date.

Policyholder Account Balance, Guaranteed Minimum Crediting Rate

The balance of the account values by range of guaranteed minimum crediting rates and the related range of difference, in basis points, between rates being credited to policyholders and the respective guaranteed minimums is as follows.

	September 30, 2023
Range of Guaranteed Minimum Crediting Rate	At Guaranteed Minimum		1 Basis Point - 50 Basis Points Above		51 Basis Points - 150 Basis Points Above		Greater than 150 Basis Points Above		Total
	(in millions of dollars)
	Unum US - Voluntary Benefits
3.00% - 3.99%	$	91.6	$	—	$	—	$	—	$	91.6
4.00% - 4.99%	265.4		188.5		—		—		453.9
5.00% - 6.00%	33.0		—		—		—		33.0
	390.0		188.5		—		—		578.5
	Colonial Life
4.00% - 5.00%	845.8		6.1		—		—		851.9
	Closed Block - All Other
3.00% - 5.99%	431.3		1,181.2		27.1		—		1,639.6
6.00% - 8.99%	2.1		28.5		—		—		30.6
9.00% - 11.99%	398.4		1,914.7		—		—		2,313.1
12.00% - 15.00%	—		182.6		—		—		182.6
	831.8		3,307.0		27.1		—		4,165.9
Total	$	2,067.6	$	3,501.6	$	27.1	$	—	$	5,596.3

	September 30, 2022
Range of Guaranteed Minimum Crediting Rate	At Guaranteed Minimum		1 Basis Point - 50 Basis Points Above		51 Basis Points - 150 Basis Points Above		Greater than 150 Basis Points Above		Total
	(in millions of dollars)
	Unum US - Voluntary Benefits
3.00% - 3.99%	$	95.3	$	—	$	—	$	—	$	95.3
4.00% - 4.99%	277.4		182.2		—		—		459.6
5.00% - 6.00%	34.2		—		—		—		34.2
	406.9		182.2		—		—		589.1
	Colonial Life
4.00% - 5.00%	845.0		5.9		—		—		850.9
	Closed Block - All Other
3.00% - 5.99%	1,708.4		29.1		6.6		—		1,744.1
6.00% - 8.99%	30.5		—		—		—		30.5
9.00% - 11.99%	2,289.6		—		—		—		2,289.6
12.00% - 15.00%	170.7		—		—		—		170.7
	4,199.2		29.1		6.6		—		4,234.9
Total	$	5,451.1	$	217.2	$	6.6	$	—	$	5,674.9

Deferred Policy Acquisition Costs

The following tables display the changes in DAC throughout the period:

	September 30, 2023
	Unum US		Unum International		Colonial Life		Total
	(in millions of dollars)
Balance, beginning of year	$	1,185.1	$	37.0	$	1,337.9	$	2,560.0
Capitalization	230.6		10.8		226.1		467.5
Amortization expense	(199.2)		(6.1)		(153.4)		(358.7)
Foreign currency	—		(0.1)		—		(0.1)
Balance, end of period	$	1,216.5	$	41.6	$	1,410.6	$	2,668.7

	September 30, 2022
	Unum US		Unum International		Colonial Life		Total
	(in millions of dollars)
Balance, beginning of year	$	1,152.9	$	36.4	$	1,238.1	$	2,427.4
Capitalization	199.4		9.3		210.4		419.1
Amortization expense	(178.5)		(6.1)		(128.4)		(313.0)
Foreign currency	—		(7.0)		—		(7.0)
Balance, end of period	$	1,173.8	$	32.6	$	1,320.1	$	2,526.5

	September 30, 2023
	Group Disability		Group Life and AD&D		Voluntary Benefits		Individual Disability		Dental and Vision		Total Unum US
	(in millions of dollars)
Balance, beginning of year	$	61.0	$	49.3	$	601.0	$	464.4	$	9.4	$	1,185.1
Capitalization	44.7		28.9		85.2		62.6		9.2		230.6
Amortization expense	(42.1)		(29.5)		(79.5)		(40.2)		(7.9)		(199.2)
Balance, end of period	$	63.6	$	48.7	$	606.7	$	486.8	$	10.7	$	1,216.5

	September 30, 2022
	Group Disability		Group Life and AD&D		Voluntary Benefits		Individual Disability		Dental and Vision		Total Unum US
	(in millions of dollars)
Balance, beginning of year	$	60.9	$	53.9	$	588.6	$	441.8	$	7.7	$	1,152.9
Capitalization	38.1		26.9		76.0		50.9		7.5		199.4
Amortization expense	(38.0)		(30.5)		(66.6)		(36.8)		(6.6)		(178.5)
Balance, end of period	$	61.0	$	50.3	$	598.0	$	455.9	$	8.6	$	1,173.8

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Segment Information (Tables)

9 Months Ended

Sep. 30, 2023

Segment Reporting [Abstract]

Premium Income by Major Line of Business within Each Segment

Segment information is shown below. Certain prior year amounts were reclassified to conform to current year presentation.

	Three Months Ended September 30				Nine Months Ended September 30
	2023		2022		2023		2022
	(in millions of dollars)
Premium Income
Unum US
Group Disability
Group Long-term Disability	$	518.5	$	480.9	$	1,539.3	$	1,419.2
Group Short-term Disability	256.5		232.2		753.0		685.9
Group Life and Accidental Death & Dismemberment
Group Life	423.0		417.7		1,254.3		1,249.9
Accidental Death & Dismemberment	44.1		43.8		131.2		129.7
Supplemental and Voluntary
Voluntary Benefits	209.5		196.2		637.4		629.2
Individual Disability	136.7		118.9		386.7		350.3
Dental and Vision	69.4		67.1		206.8		206.6
	1,657.7		1,556.8		4,908.7		4,670.8
Unum International
Unum UK
Group Long-term Disability	101.1		89.8		297.5		287.5
Group Life	44.2		35.0		124.5		100.5
Supplemental	34.6		27.4		99.9		85.8
Unum Poland	30.7		21.1		85.2		66.7
	210.6		173.3		607.1		540.5
Colonial Life
Accident, Sickness, and Disability	236.7		236.1		708.0		714.0
Life	106.2		100.2		318.1		303.2
Cancer and Critical Illness	88.3		87.0		265.2		264.4
	431.2		423.3		1,291.3		1,281.6
Closed Block
Long-term Care	172.1		174.5		521.2		523.0
All Other	54.3		61.0		166.0		190.4
	226.4		235.5		687.2		713.4
Total Premium Income	$	2,525.9	$	2,388.9	$	7,494.3	$	7,206.3

Selected Operating Statement Data by Segment

	Unum US		Unum International		Colonial Life		Closed Block		Corporate		Total
	(in millions of dollars)
Three Months Ended September 30, 2023
Premium Income	$	1,657.7	$	210.6	$	431.2	$	226.4	$	—	$	2,525.9
Net Investment Income	166.2		27.3		39.3		274.9		18.3		526.0
Other Income	58.0		0.5		0.3		12.8		—		71.6
Adjusted Operating Revenue	$	1,881.9	$	238.4	$	470.8	$	514.1	$	18.3	$	3,123.5
Adjusted Operating Income (Loss)	$	357.8	$	36.8	$	102.9	$	34.2	$	(41.5)	$	490.2
Three Months Ended September 30, 2022
Premium Income	$	1,556.8	$	173.3	$	423.3	$	235.5	$	—	$	2,388.9
Net Investment Income	170.6		37.0		38.6		251.4		14.0		511.6
Other Income	49.0		0.2		0.3		13.1		0.4		63.0
Adjusted Operating Revenue	$	1,776.4	$	210.5	$	462.2	$	500.0	$	14.4	$	2,963.5
Adjusted Operating Income (Loss)	$	280.8	$	24.9	$	117.9	$	42.1	$	(49.5)	$	416.2

	Unum US		Unum International		Colonial Life		Closed Block		Corporate		Total
	(in millions of dollars)
Nine Months Ended September 30, 2023
Premium Income	$	4,908.7	$	607.1	$	1,291.3	$	687.2	$	—	$	7,494.3
Net Investment Income	481.5		104.0		114.6		796.0		69.8		1,565.9
Other Income	166.1		1.0		0.9		40.1		2.5		210.6
Adjusted Operating Revenue	$	5,556.3	$	712.1	$	1,406.8	$	1,523.3	$	72.3	$	9,270.8
Adjusted Operating Income (Loss)	$	1,013.4	$	118.7	$	312.3	$	143.6	$	(109.9)	$	1,478.1
Nine Months Ended September 30, 2022
Premium Income	$	4,670.8	$	540.5	$	1,281.6	$	713.4	$	—	$	7,206.3
Net Investment Income	509.4		122.3		115.4		817.7		33.0		1,597.8
Other Income	146.8		0.7		0.8		45.6		3.6		197.5
Adjusted Operating Revenue	$	5,327.0	$	663.5	$	1,397.8	$	1,576.7	$	36.6	$	9,001.6
Adjusted Operating Income (Loss)	$	741.0	$	78.9	$	317.4	$	207.6	$	(126.8)	$	1,218.1

Assets by Segment

	September 30		December 31
	2023		2022
	(in millions of dollars)
Assets
Unum US	$	15,088.5	$	16,356.3
Unum International	3,165.9		3,129.4
Colonial Life	4,608.6		4,575.0
Closed Block	33,070.4		33,776.6
Corporate	4,021.1		3,311.2
Total Assets	$	59,954.5	$	61,148.5

Reconciliation of Total Revenue and Income Before Income Tax to Adjusted Operating Revenue and Adjusted Operating Income

A reconciliation of total revenue to "adjusted operating revenue" and income before income tax to "adjusted operating income" is as follows:

	Three Months Ended September 30				Nine Months Ended September 30
	2023		2022		2023		2022
	(in millions of dollars)
Total Revenue	$	3,092.5	$	2,959.1	$	9,240.8	$	8,979.3
Excluding:
Net Investment Loss	(31.0)		(4.4)		(30.0)		(22.3)
Adjusted Operating Revenue	$	3,123.5	$	2,963.5	$	9,270.8	$	9,001.6
Income Before Income Tax	$	261.7	$	641.6	$	1,211.4	$	1,376.5
Excluding:
Net Investment Loss	(31.0)		(4.4)		(30.0)		(22.3)
Amortization of the Cost of Reinsurance	(11.1)		(11.8)		(33.1)		(38.5)
Non-Contemporaneous Reinsurance	(9.2)		(1.7)		(26.4)		(24.1)
Reserve Assumption Updates	(177.2)		243.3		(177.2)		243.3
Adjusted Operating Income	$	490.2	$	416.2	$	1,478.1	$	1,218.1

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Employee Benefit Plans (Tables)

9 Months Ended

Sep. 30, 2023

Retirement Benefits [Abstract]

Schedule of Net Benefit Costs

The following table provides the components of the net periodic benefit cost (credit) for the defined benefit pension and OPEB plans.

	Three Months Ended September 30
	Pension Benefits
	U.S. Plans				U.K. Plan				OPEB
	2023		2022		2023		2022		2023		2022
	(in millions of dollars)
Service Cost	$	2.3	$	1.9	$	—	$	—	$	—	$	—
Interest Cost	22.0		16.8		1.9		1.2		1.1		0.8
Expected Return on Plan Assets	(23.0)		(26.5)		(2.1)		(2.6)		(0.2)		(0.2)
Amortization of:
Net Actuarial (Gain) Loss	3.8		4.1		0.6		0.1		(2.6)		(0.2)
Prior Service Credit	—		—		—		—		—		(0.1)
Total Net Periodic Benefit Cost (Credit)	$	5.1	$	(3.7)	$	0.4	$	(1.3)	$	(1.7)	$	0.3

	Nine Months Ended September 30
	Pension Benefits
	U.S. Plans				U.K. Plan				OPEB
	2023		2022		2023		2022		2023		2022
	(in millions of dollars)
Service Cost	$	6.9	$	5.8	$	—	$	—	$	—	$	—
Interest Cost	66.0		50.4		5.7		3.8		3.4		2.3
Expected Return on Plan Assets	(69.1)		(79.5)		(6.3)		(8.3)		(0.4)		(0.4)
Amortization of:
Net Actuarial (Gain) Loss	11.4		12.2		1.9		0.3		(7.9)		(0.7)
Prior Service Credit	—		—		—		—		(0.1)		(0.2)
Total Net Periodic Benefit Cost (Credit)	$	15.2	$	(11.1)	$	1.3	$	(4.2)	$	(5.0)	$	1.0

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Stockholders' Equity and Earnings Per Common Share (Tables)

9 Months Ended

Sep. 30, 2023

Stockholders' Equity and Earnings Per Common Share [Abstract]

Schedule of Basic and Diluted Earnings Per Share

Net income per common share is determined as follows:

	Three Months Ended September 30				Nine Months Ended September 30
	2023		2022		2023		2022
	(in millions of dollars, except share data)
Numerator
Net Income	$	202.0	$	510.3	$	953.2	$	1,118.0
Denominator (000s)
Weighted Average Common Shares - Basic	196,083.2		200,035.3		197,289.5		201,262.3
Dilution for Assumed Exercises of Nonvested Stock Awards	1,048.6		1,614.9		1,005.6		1,256.7
Weighted Average Common Shares - Assuming Dilution	197,131.8		201,650.2		198,295.1		202,519.0
Net Income Per Common Share
Basic	$	1.03	$	2.55	$	4.83	$	5.55
Assuming Dilution	$	1.02	$	2.53	$	4.81	$	5.52

Treasury Stock Transactions

Common stock repurchases, which are accounted for using the cost method and classified as treasury stock until otherwise retired, were as follows:

	Three Months Ended September 30				Nine Months Ended September 30
	2023		2022		2023		2022
	(in millions)
Shares Repurchased	1.5		1.2		3.9		4.2
Cost of Shares Repurchased1	$	74.8	$	42.6	$	175.4	$	137.5

1Includes a de minimis amount and $0.1 million of commissions for the three and nine months ended September 30, 2023, respectively, and a de minimis amount and $0.1 million of commissions for the three and nine months ended September 30, 2022, respectively. There was $0.7 million and $1.2 million of excise tax for the three and nine months ended September 30, 2023, respectively. There were no excise taxes during the three and nine months ended September 30, 2022.

As a part of our share repurchase program, we periodically enter into accelerated share repurchase agreements (ASR). Under the terms of these agreements, we make a prepayment to a financial counterparty for which we receive an initial delivery of approximately 75 percent of the total Unum Group common stock to be delivered under the agreement. We simultaneously enter into a forward contract indexed to the price of Unum Group common stock, which subjects the transactions to a future price adjustment. Under the terms of the agreements, we are to receive, or be required to pay, a price adjustment based on the volume weighted average price of Unum Group common stock during the term of the agreement, less a discount. Any price adjustment payable to us is settled in shares of Unum Group common stock. Any price adjustment we would be required to pay may be settled in either cash or common stock at our option. Details of our ASRs for the nine months ended September 30, 2023 and 2022 are as follows:

Prepayment Date	Prepayment Amount	Initial Share Delivery	Forward Contract Settlement Date	Shares Delivered to Settle Forward Contract
(in millions)
July 2023	$50.0	0.8	September 2023	0.2
February 2022	50.0	1.3	April 2022	0.4

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Accounting Developments (Details) $ / shares in Units, $ in Millions		3 Months Ended					9 Months Ended
		Sep. 30, 2023 USD ($) $ / shares	Sep. 30, 2022 USD ($) $ / shares		Sep. 30, 2022 USD ($) $ / shares		Sep. 30, 2023 USD ($) $ / shares	Sep. 30, 2022 USD ($) $ / shares		Sep. 30, 2022 USD ($) $ / shares		Jun. 30, 2023 USD ($)	Dec. 31, 2022 USD ($)		Jun. 30, 2022 USD ($)	Dec. 31, 2021 USD ($)	Jan. 01, 2021 USD ($)		Dec. 31, 2020 USD ($)
Cumulative Effect on Opening Balance in Period of Adoption [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest		$ (3,150.6)	$ (3,611.0)		$ (3,611.0)		$ (3,150.6)	$ (3,611.0)		$ (3,611.0)		$ (3,457.6)	$ (3,448.3)		$ (3,809.5)	$ (5,164.6)	$ 4,166.0
Deferred Acquisition Costs		2,668.7	2,526.5		2,526.5		2,668.7	2,526.5		2,526.5			2,560.0				2,357.7
Reinsurance Recoverable		8,855.2	9,574.1		9,574.1		8,855.2	9,574.1		9,574.1			9,608.0
Deferred Income Tax		617.1	601.2		601.2		617.1	601.2		601.2			586.0
Other Assets		1,640.9	1,674.4	[1]	1,674.4	[1]	1,640.9	1,674.4	[1]	1,674.4	[1]		1,666.6
Total Assets		59,954.5	60,377.9		60,377.9		59,954.5	60,377.9		60,377.9			61,148.5
Policy and Contract Benefits			0.0	[2]	0.0	[2]		0.0	[2]	0.0	[2]		0.0	[3]
Reserves for Future Policy and Contract Benefits			0.0	[2]	0.0	[2]		0.0	[2]	0.0	[2]		0.0	[3]
Future Policy Benefits		36,502.4	37,808.0	[2]	37,808.0	[2]	36,502.4	37,808.0	[2]	37,808.0	[2]		38,577.1	[3]
Policyholders' Account Balances		5,744.5	5,812.8	[2]	5,812.8	[2]	5,744.5	5,812.8	[2]	5,812.8	[2]		5,740.2	[3]
Unearned Premiums		447.2	406.8		406.8		447.2	406.8		406.8			365.5
Deferred Income Tax		27.1	20.9		20.9		27.1	20.9		20.9			25.2
Liabilities		50,336.4	51,975.1		51,975.1		50,336.4	51,975.1		51,975.1			52,413.5
Accumulated Other Comprehensive Loss		(3,150.6)	(3,611.0)		(3,611.0)		(3,150.6)	(3,611.0)		(3,611.0)			(3,448.3)		(3,809.5)	(5,164.6)
Retained Earnings		13,888.7	12,917.9		12,917.9		13,888.7	12,917.9		12,917.9			13,141.3		12,473.7	11,989.4
Stockholders' Equity Attributable to Parent		9,618.1	8,402.8		8,402.8		9,618.1	8,402.8		8,402.8			8,735.0
Premium Income		2,525.9	2,388.9				7,494.3	7,206.3
Policy Benefits		1,778.6	1,843.2				5,498.6	5,691.9
Policy Benefits - Remeasurement Loss (Gain)		168.4	(341.7)				(61.6)	(476.1)
Amortization of Deferred Acquisition Costs		129.1	102.9				358.7	313.0
Other Expenses		271.8	243.9				818.6	734.4
Income Tax - Deferred		(127.8)	(25.6)				(123.5)	(125.3)
Net Income		$ 202.0	$ 510.3				$ 953.2	$ 1,118.0
Basic Earnings Per Share | $ / shares		$ 1.03	$ 2.55				$ 4.83	$ 5.55
Diluted Earnings Per Share | $ / shares		$ 1.02	$ 2.53				$ 4.81	$ 5.52
Change in Adjustment to Deferred Acquisition Costs and Reserves for Future Policy and Contract Benefits, Net of Reinsurance			$ 0.0					$ 0.0
Change in the Effect of Discount Rate Assumptions on the Liability for Future Policy Benefits, Net of Reinsurance (net of tax expense of $445.0; $599.4; $368.2; $2,485.7)		$ 1,688.4	2,222.9				$ 1,374.6	9,252.4
Change in Foreign Currency Translation Adjustment		(55.1)	(71.5)				7.9	(164.9)
Comprehensive Income (Loss)		509.0	708.8				1,250.9	2,671.6
Other Comprehensive Income (Loss)		307.0	198.5				297.7	1,553.6
Change in Receivables							455.9	457.9
Deferred Policy Acquisition Cost							108.8	106.1
Change in Insurance Liabilities							(169.3)	(112.6)
Change in Income Taxes							(26.9)	7.3
Amortization of the Cost of Reinsurance							33.1	38.5
Operating Segments
Cumulative Effect on Opening Balance in Period of Adoption [Line Items]
Liability for Future Policy Benefit, before Reinsurance, after Other		36,266.3	37,590.2		37,590.2		36,266.3	37,590.2		37,590.2							55,585.4
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance		7,449.0	8,154.6		8,154.6		7,449.0	8,154.6		8,154.6							10,496.0	[4]
Liability for Future Policy Benefit, after Reinsurance		28,817.3	29,435.6		29,435.6		28,817.3	29,435.6		29,435.6							45,089.4
Deferred Acquisition Costs		2,668.7	2,526.5		2,526.5		2,668.7	2,526.5		2,526.5			2,560.0			2,427.4
Future Policy Benefits		36,502.4	37,808.0		37,808.0		36,502.4	37,808.0		37,808.0
Policyholders' Account Balances		5,744.5	5,812.8		5,812.8		5,744.5	5,812.8		5,812.8
Premium Income		2,525.9	2,388.9				7,494.3	7,206.3
Amortization of Deferred Acquisition Costs							358.7	313.0
Unum US
Cumulative Effect on Opening Balance in Period of Adoption [Line Items]
Liability for Future Policy Benefit, before Reinsurance, after Other		8,930.0	9,601.9		9,601.9		8,930.0	9,601.9		9,601.9							12,861.4
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance		200.3	255.9		255.9		200.3	255.9		255.9							357.7	[4]
Liability for Future Policy Benefit, after Reinsurance		8,729.7	9,346.0		9,346.0		8,729.7	9,346.0		9,346.0							12,503.7
Deferred Acquisition Costs		1,216.5	1,173.8		1,173.8		1,216.5	1,173.8		1,173.8			1,185.1			1,152.9	1,181.0
Future Policy Benefits	[5]	8,930.0	9,601.9		9,601.9		8,930.0	9,601.9		9,601.9
Amortization of Deferred Acquisition Costs							199.2	178.5
Unum US | Group Disability
Cumulative Effect on Opening Balance in Period of Adoption [Line Items]
Liability for Future Policy Benefit, before Reinsurance, after Other		5,053.4	5,570.5		5,570.5		5,053.4	5,570.5		5,570.5							7,295.7
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance		32.8	36.8		36.8		32.8	36.8		36.8							58.3
Liability for Future Policy Benefit, after Reinsurance		5,020.6	5,533.7		5,533.7		5,020.6	5,533.7		5,533.7							7,237.4
Deferred Acquisition Costs		63.6	61.0		61.0		63.6	61.0		61.0			61.0			60.9
Amortization of Deferred Acquisition Costs							42.1	38.0
Unum US | Group Life and AD&D
Cumulative Effect on Opening Balance in Period of Adoption [Line Items]
Liability for Future Policy Benefit, before Reinsurance, after Other		905.5	937.0		937.0		905.5	937.0		937.0							1,127.3
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance		6.2	6.0		6.0		6.2	6.0		6.0							3.0
Liability for Future Policy Benefit, after Reinsurance		899.3	931.0		931.0		899.3	931.0		931.0							1,124.3
Deferred Acquisition Costs		48.7	50.3		50.3		48.7	50.3		50.3			49.3			53.9
Amortization of Deferred Acquisition Costs							29.5	30.5
Unum US | Individual Disability
Cumulative Effect on Opening Balance in Period of Adoption [Line Items]
Liability for Future Policy Benefit, before Reinsurance, after Other		1,913.7	1,978.5		1,978.5		1,913.7	1,978.5		1,978.5							2,767.7
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance		148.1	189.7		189.7		148.1	189.7		189.7							260.6
Liability for Future Policy Benefit, after Reinsurance		1,765.6	1,788.8		1,788.8		1,765.6	1,788.8		1,788.8							2,507.1
Deferred Acquisition Costs		486.8	455.9		455.9		486.8	455.9		455.9			464.4			441.8
Amortization of Deferred Acquisition Costs							40.2	36.8
Unum US | Voluntary Benefits
Cumulative Effect on Opening Balance in Period of Adoption [Line Items]
Liability for Future Policy Benefit, before Reinsurance, after Other		1,057.4	1,115.9		1,115.9		1,057.4	1,115.9		1,115.9							1,659.2
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance		13.2	23.4		23.4		13.2	23.4		23.4							35.7
Liability for Future Policy Benefit, after Reinsurance		1,044.2	1,092.5		1,092.5		1,044.2	1,092.5		1,092.5							1,623.5
Deferred Acquisition Costs		606.7	598.0		598.0		606.7	598.0		598.0			601.0			588.6
Policyholders' Account Balances		677.7	678.5		678.5		677.7	678.5		678.5
Amortization of Deferred Acquisition Costs							79.5	66.6
Unum US | Dental and Vision
Cumulative Effect on Opening Balance in Period of Adoption [Line Items]
Liability for Future Policy Benefit, before Reinsurance, after Other																	11.5
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance																	0.1
Liability for Future Policy Benefit, after Reinsurance																	11.4
Deferred Acquisition Costs		10.7	8.6		8.6		10.7	8.6		8.6			9.4			7.7
Amortization of Deferred Acquisition Costs							7.9	6.6
Unum US | Operating Segments
Cumulative Effect on Opening Balance in Period of Adoption [Line Items]
Total Assets		15,088.5					15,088.5						16,356.3
Premium Income		1,657.7	1,556.8				4,908.7	4,670.8
Unum US | Operating Segments | Voluntary Benefits
Cumulative Effect on Opening Balance in Period of Adoption [Line Items]
Premium Income		209.5	196.2				637.4	629.2
Unum US | Operating Segments | Dental and Vision
Cumulative Effect on Opening Balance in Period of Adoption [Line Items]
Premium Income		69.4	67.1				206.8	206.6
Unum International
Cumulative Effect on Opening Balance in Period of Adoption [Line Items]
Liability for Future Policy Benefit, before Reinsurance, after Other		2,051.2	1,799.2		1,799.2		2,051.2	1,799.2		1,799.2							3,203.4
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance		69.4	57.8		57.8		69.4	57.8		57.8							132.5	[4]
Liability for Future Policy Benefit, after Reinsurance		1,981.8	1,741.4		1,741.4		1,981.8	1,741.4		1,741.4							3,070.9
Deferred Acquisition Costs		41.6	32.6		32.6		41.6	32.6		32.6			37.0			36.4	32.0
Future Policy Benefits		2,051.2	1,799.2		1,799.2		2,051.2	1,799.2		1,799.2
Amortization of Deferred Acquisition Costs							6.1	6.1
Unum International | Operating Segments
Cumulative Effect on Opening Balance in Period of Adoption [Line Items]
Total Assets		3,165.9					3,165.9						3,129.4
Premium Income		210.6	173.3				607.1	540.5
Colonial Life
Cumulative Effect on Opening Balance in Period of Adoption [Line Items]
Liability for Future Policy Benefit, before Reinsurance, after Other		1,763.4	1,791.5		1,791.5		1,763.4	1,791.5		1,791.5							2,528.6
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance		0.9	1.3		1.3		0.9	1.3		1.3							4.4	[4]
Liability for Future Policy Benefit, after Reinsurance		1,762.5	1,790.2		1,790.2		1,762.5	1,790.2		1,790.2							2,524.2
Deferred Acquisition Costs		1,410.6	1,320.1		1,320.1		1,410.6	1,320.1		1,320.1			1,337.9			1,238.1	1,144.7
Future Policy Benefits		1,763.4	1,791.5		1,791.5		1,763.4	1,791.5		1,791.5
Policyholders' Account Balances		868.5	868.4		868.4		868.5	868.4		868.4
Amortization of Deferred Acquisition Costs							153.4	128.4
Colonial Life | Operating Segments
Cumulative Effect on Opening Balance in Period of Adoption [Line Items]
Total Assets		4,608.6					4,608.6						4,575.0
Premium Income		431.2	423.3				1,291.3	1,281.6
Closed Block
Cumulative Effect on Opening Balance in Period of Adoption [Line Items]
Liability for Future Policy Benefit, before Reinsurance, after Other		23,521.7	24,397.6		24,397.6		23,521.7	24,397.6		24,397.6							36,992.0
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance		7,178.3	7,839.5		7,839.5		7,178.3	7,839.5		7,839.5							10,001.4	[4]
Liability for Future Policy Benefit, after Reinsurance		16,343.4	16,558.1		16,558.1		16,343.4	16,558.1		16,558.1							26,990.6
Future Policy Benefits	[5]	23,521.7	24,397.6		24,397.6		23,521.7	24,397.6		24,397.6
Closed Block | Long-term Care
Cumulative Effect on Opening Balance in Period of Adoption [Line Items]
Liability for Future Policy Benefit, before Reinsurance, after Other		14,372.7	14,401.8		14,401.8		14,372.7	14,401.8		14,401.8							22,740.9
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance		4.6	5.3		5.3		4.6	5.3		5.3							44.4
Liability for Future Policy Benefit, after Reinsurance		14,368.1	14,396.5		14,396.5		14,368.1	14,396.5		14,396.5							22,696.5
Closed Block | Other Insurance Product Line
Cumulative Effect on Opening Balance in Period of Adoption [Line Items]
Liability for Future Policy Benefit, before Reinsurance, after Other		9,149.0	9,995.8		9,995.8		9,149.0	9,995.8		9,995.8							14,251.1
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance		7,173.7	7,834.2		7,834.2		7,173.7	7,834.2		7,834.2							9,957.0
Liability for Future Policy Benefit, after Reinsurance		1,975.3	2,161.6		2,161.6		1,975.3	2,161.6		2,161.6							4,294.1
Policyholders' Account Balances		4,198.3	4,265.9		4,265.9		4,198.3	4,265.9		4,265.9
Closed Block | Operating Segments
Cumulative Effect on Opening Balance in Period of Adoption [Line Items]
Total Assets		33,070.4					33,070.4						33,776.6
Premium Income		226.4	235.5				687.2	713.4
Closed Block | Operating Segments | Long-term Care
Cumulative Effect on Opening Balance in Period of Adoption [Line Items]
Premium Income		172.1	174.5				521.2	523.0
Closed Block | Operating Segments | Other Insurance Product Line
Cumulative Effect on Opening Balance in Period of Adoption [Line Items]
Premium Income		54.3	61.0				166.0	190.4
Retained Earnings
Cumulative Effect on Opening Balance in Period of Adoption [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest																	11,249.0
Stockholders' Equity Attributable to Parent		13,888.7	12,917.9		12,917.9		13,888.7	12,917.9		12,917.9		13,758.1	13,141.3		12,473.7	11,989.4
Net Income		202.0	510.3				953.2	1,118.0
Accumulated Other Comprehensive Income (Loss)
Cumulative Effect on Opening Balance in Period of Adoption [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest																	(6,310.2)
Stockholders' Equity Attributable to Parent		(3,150.6)	(3,611.0)		(3,611.0)		(3,150.6)	(3,611.0)		(3,611.0)		$ (3,457.6)	(3,448.3)		(3,809.5)	(5,164.6)
Other Comprehensive Income (Loss)		$ 307.0	198.5				$ 297.7
Previously Reported
Cumulative Effect on Opening Balance in Period of Adoption [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest																			$ 10,871.0
Deferred Acquisition Costs			2,254.6		2,254.6			2,254.6		2,254.6			2,252.3						2,272.6
Reinsurance Recoverable			10,289.7		10,289.7			10,289.7		10,289.7			10,218.6
Deferred Income Tax			523.1		523.1			523.1		523.1			449.8
Other Assets			1,797.6	[1]	1,797.6	[1]		1,797.6	[1]	1,797.6	[1]		1,786.3
Total Assets			60,866.7		60,866.7			60,866.7		60,866.7			61,434.9
Policy and Contract Benefits			1,771.4	[2]	1,771.4	[2]		1,771.4	[2]	1,771.4	[2]		1,839.8	[3]
Reserves for Future Policy and Contract Benefits			42,108.7	[2]	42,108.7	[2]		42,108.7	[2]	42,108.7	[2]		42,330.2	[3]
Future Policy Benefits			0.0	[2]	0.0	[2]		0.0	[2]	0.0	[2]		0.0	[3]
Policyholders' Account Balances			0.0	[2]	0.0	[2]		0.0	[2]	0.0	[2]		0.0	[3]
Unearned Premiums			394.0		394.0			394.0		394.0			352.7
Deferred Income Tax			6.5		6.5			6.5		6.5			9.2
Liabilities			52,207.2		52,207.2			52,207.2		52,207.2			52,237.4
Accumulated Other Comprehensive Loss			(3,134.7)		(3,134.7)			(3,134.7)		(3,134.7)			(2,756.6)		(1,772.2)	354.1
Retained Earnings			12,698.3		12,698.3			12,698.3		12,698.3			12,912.1		12,353.7	11,853.2
Stockholders' Equity Attributable to Parent			8,659.5		$ 8,659.5			8,659.5		$ 8,659.5			9,197.5
Premium Income			2,391.7					7,212.3
Policy Benefits	[6]		1,579.3					5,181.3
Policy Benefits - Remeasurement Loss (Gain)			0.0					0.0
Amortization of Deferred Acquisition Costs			150.8					449.5
Other Expenses			247.3					744.4
Income Tax - Deferred			(52.3)					(147.9)
Net Income			410.7					1,034.6
Basic Earnings Per Share | $ / shares					$ 2.05					$ 5.14
Diluted Earnings Per Share | $ / shares					$ 2.04					$ 5.11
Change in Adjustment to Deferred Acquisition Costs and Reserves for Future Policy and Contract Benefits, Net of Reinsurance			661.4					(7,500.7)
Change in the Effect of Discount Rate Assumptions on the Liability for Future Policy Benefits, Net of Reinsurance (net of tax expense of $445.0; $599.4; $368.2; $2,485.7)			0.0					0.0
Change in Foreign Currency Translation Adjustment			(71.1)					(164.1)
Comprehensive Income (Loss)			(951.8)					(2,454.2)
Other Comprehensive Income (Loss)			(1,362.5)					(3,488.8)
Change in Receivables								437.8
Deferred Policy Acquisition Cost								(30.4)
Change in Insurance Liabilities								(125.5)
Change in Income Taxes								(21.6)
Amortization of the Cost of Reinsurance								48.5
Previously Reported | Operating Segments
Cumulative Effect on Opening Balance in Period of Adoption [Line Items]
Liability for Future Policy Benefit, before Reinsurance, after Other	[7]																		45,704.4
Previously Reported | Unum US
Cumulative Effect on Opening Balance in Period of Adoption [Line Items]
Liability for Future Policy Benefit, before Reinsurance, after Other	[7]																		12,184.6
Deferred Acquisition Costs																			1,168.7
Previously Reported | Unum US | Group Disability
Cumulative Effect on Opening Balance in Period of Adoption [Line Items]
Liability for Future Policy Benefit, before Reinsurance, after Other																			7,409.0
Previously Reported | Unum US | Group Life and AD&D
Cumulative Effect on Opening Balance in Period of Adoption [Line Items]
Liability for Future Policy Benefit, before Reinsurance, after Other																			1,123.9
Previously Reported | Unum US | Individual Disability
Cumulative Effect on Opening Balance in Period of Adoption [Line Items]
Liability for Future Policy Benefit, before Reinsurance, after Other																			2,485.3
Previously Reported | Unum US | Voluntary Benefits
Cumulative Effect on Opening Balance in Period of Adoption [Line Items]
Liability for Future Policy Benefit, before Reinsurance, after Other																			1,154.9
Previously Reported | Unum US | Dental and Vision
Cumulative Effect on Opening Balance in Period of Adoption [Line Items]
Liability for Future Policy Benefit, before Reinsurance, after Other																			11.5
Previously Reported | Unum International
Cumulative Effect on Opening Balance in Period of Adoption [Line Items]
Liability for Future Policy Benefit, before Reinsurance, after Other	[7]																		2,969.8
Deferred Acquisition Costs																			32.0
Previously Reported | Colonial Life
Cumulative Effect on Opening Balance in Period of Adoption [Line Items]
Liability for Future Policy Benefit, before Reinsurance, after Other	[7]																		1,977.2
Deferred Acquisition Costs																			1,071.9
Previously Reported | Closed Block
Cumulative Effect on Opening Balance in Period of Adoption [Line Items]
Liability for Future Policy Benefit, before Reinsurance, after Other	[7]																		28,572.8
Previously Reported | Closed Block | Long-term Care
Cumulative Effect on Opening Balance in Period of Adoption [Line Items]
Liability for Future Policy Benefit, before Reinsurance, after Other																			16,283.4
Previously Reported | Closed Block | Other Insurance Product Line
Cumulative Effect on Opening Balance in Period of Adoption [Line Items]
Liability for Future Policy Benefit, before Reinsurance, after Other																			12,289.4
Previously Reported | Retained Earnings
Cumulative Effect on Opening Balance in Period of Adoption [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest																			11,269.6
Previously Reported | Accumulated Other Comprehensive Income (Loss)
Cumulative Effect on Opening Balance in Period of Adoption [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest																			$ 374.2
Revision of Prior Period, Accounting Standards Update, Adjustment | Accounting Standards Update 2018-12
Cumulative Effect on Opening Balance in Period of Adoption [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest																	(6,705.0)
Deferred Acquisition Costs			271.9		$ 271.9			271.9		$ 271.9			307.7
Removal of Shadow Adjustments, DAC																	85.1
Reinsurance Recoverable			(715.6)		(715.6)			(715.6)		(715.6)			(610.6)
Deferred Income Tax			78.1		78.1			78.1		78.1			136.2
Other Assets			(123.2)	[1]	(123.2)	[1]		(123.2)	[1]	(123.2)	[1]		(119.7)
Total Assets			(488.8)		(488.8)			(488.8)		(488.8)			(286.4)
Policy and Contract Benefits			(1,771.4)	[2]	(1,771.4)	[2]		(1,771.4)	[2]	(1,771.4)	[2]		(1,839.8)	[3]
Reserves for Future Policy and Contract Benefits			(42,108.7)	[2]	(42,108.7)	[2]		(42,108.7)	[2]	(42,108.7)	[2]		(42,330.2)	[3]
Future Policy Benefits			37,808.0	[2]	37,808.0	[2]		37,808.0	[2]	37,808.0	[2]		38,577.1	[3]
Policyholders' Account Balances			5,812.8	[2]	5,812.8	[2]		5,812.8	[2]	5,812.8	[2]		5,740.2	[3]
Unearned Premiums			12.8		12.8			12.8		12.8			12.8
Deferred Income Tax			14.4		14.4			14.4		14.4			16.0
Liabilities			(232.1)		(232.1)			(232.1)		(232.1)			176.1
Accumulated Other Comprehensive Loss			(476.3)		(476.3)			(476.3)		(476.3)			(691.7)		(2,037.3)	(5,518.7)
Retained Earnings			219.6		219.6			219.6		219.6			229.2		$ 120.0	$ 136.2
Stockholders' Equity Attributable to Parent			(256.7)		$ (256.7)			(256.7)		$ (256.7)			$ (462.5)
Premium Income			(2.8)					(6.0)
Policy Benefits	[6]		263.9					510.6
Policy Benefits - Remeasurement Loss (Gain)			(341.7)					(476.1)
Amortization of Deferred Acquisition Costs			(47.9)					(136.5)
Other Expenses			(3.4)					(10.0)
Income Tax - Deferred			26.7					22.6
Net Income			99.6					83.4
Basic Earnings Per Share | $ / shares					$ 0.50					$ 0.41
Diluted Earnings Per Share | $ / shares					$ 0.49					$ 0.41
Change in Adjustment to Deferred Acquisition Costs and Reserves for Future Policy and Contract Benefits, Net of Reinsurance			(661.4)					7,500.7
Change in the Effect of Discount Rate Assumptions on the Liability for Future Policy Benefits, Net of Reinsurance (net of tax expense of $445.0; $599.4; $368.2; $2,485.7)			2,222.9					9,252.4
Change in Foreign Currency Translation Adjustment			(0.4)					(0.8)
Comprehensive Income (Loss)			1,660.6					5,125.8
Other Comprehensive Income (Loss)			$ 1,561.0					5,042.4
Change in Receivables								20.1
Deferred Policy Acquisition Cost								136.5
Change in Insurance Liabilities								12.9
Change in Income Taxes								28.9
Amortization of the Cost of Reinsurance								$ (10.0)
Revision of Prior Period, Accounting Standards Update, Adjustment | Operating Segments | Accounting Standards Update 2018-12
Cumulative Effect on Opening Balance in Period of Adoption [Line Items]
Removal of Shadow Adjustments, LFPB	[8]																(6,225.6)
Adjustments for Loss Contracts	[9]																34.9
Effect of Change in Discount Rate Assumptions																	16,084.6
Other increase (decrease)	[10]																(12.9)
Revision of Prior Period, Accounting Standards Update, Adjustment | Unum US | Accounting Standards Update 2018-12
Cumulative Effect on Opening Balance in Period of Adoption [Line Items]
Removal of Shadow Adjustments, LFPB	[8]																(1,569.7)
Adjustments for Loss Contracts	[9]																0.0
Effect of Change in Discount Rate Assumptions																	2,251.8
Other increase (decrease)	[10]																(5.3)
Removal of Shadow Adjustments, DAC	[11]																12.3
Revision of Prior Period, Accounting Standards Update, Adjustment | Unum US | Accounting Standards Update 2018-12 | Group Disability
Cumulative Effect on Opening Balance in Period of Adoption [Line Items]
Removal of Shadow Adjustments, LFPB																	(1,025.2)
Effect of Change in Discount Rate Assumptions																	911.9
Other increase (decrease)																	0.0
Revision of Prior Period, Accounting Standards Update, Adjustment | Unum US | Accounting Standards Update 2018-12 | Group Life and AD&D
Cumulative Effect on Opening Balance in Period of Adoption [Line Items]
Removal of Shadow Adjustments, LFPB																	(88.5)
Effect of Change in Discount Rate Assumptions																	91.9
Other increase (decrease)																	0.0
Revision of Prior Period, Accounting Standards Update, Adjustment | Unum US | Accounting Standards Update 2018-12 | Individual Disability
Cumulative Effect on Opening Balance in Period of Adoption [Line Items]
Removal of Shadow Adjustments, LFPB																	(446.1)
Effect of Change in Discount Rate Assumptions																	728.5
Other increase (decrease)																	0.0
Revision of Prior Period, Accounting Standards Update, Adjustment | Unum US | Accounting Standards Update 2018-12 | Voluntary Benefits
Cumulative Effect on Opening Balance in Period of Adoption [Line Items]
Removal of Shadow Adjustments, LFPB																	(9.9)
Effect of Change in Discount Rate Assumptions																	519.5
Other increase (decrease)																	(5.3)
Revision of Prior Period, Accounting Standards Update, Adjustment | Unum US | Accounting Standards Update 2018-12 | Dental and Vision
Cumulative Effect on Opening Balance in Period of Adoption [Line Items]
Removal of Shadow Adjustments, LFPB																	0.0
Effect of Change in Discount Rate Assumptions																	0.0
Other increase (decrease)																	0.0
Revision of Prior Period, Accounting Standards Update, Adjustment | Unum International | Accounting Standards Update 2018-12
Cumulative Effect on Opening Balance in Period of Adoption [Line Items]
Removal of Shadow Adjustments, LFPB	[8]																(545.8)
Adjustments for Loss Contracts	[9]																0.0
Effect of Change in Discount Rate Assumptions																	779.4
Other increase (decrease)	[10]																0.0
Removal of Shadow Adjustments, DAC																	0.0
Revision of Prior Period, Accounting Standards Update, Adjustment | Colonial Life | Accounting Standards Update 2018-12
Cumulative Effect on Opening Balance in Period of Adoption [Line Items]
Removal of Shadow Adjustments, LFPB	[8]																(44.5)
Adjustments for Loss Contracts	[9]																34.9
Effect of Change in Discount Rate Assumptions																	568.6
Other increase (decrease)	[10]																(7.6)
Removal of Shadow Adjustments, DAC																	72.8
Revision of Prior Period, Accounting Standards Update, Adjustment | Closed Block | Accounting Standards Update 2018-12
Cumulative Effect on Opening Balance in Period of Adoption [Line Items]
Removal of Shadow Adjustments, LFPB	[8]																(4,065.6)
Adjustments for Loss Contracts	[9]																0.0
Effect of Change in Discount Rate Assumptions																	12,484.8
Other increase (decrease)	[10]																0.0
Revision of Prior Period, Accounting Standards Update, Adjustment | Closed Block | Accounting Standards Update 2018-12 | Long-term Care
Cumulative Effect on Opening Balance in Period of Adoption [Line Items]
Removal of Shadow Adjustments, LFPB																	(3,465.4)
Effect of Change in Discount Rate Assumptions																	9,922.9
Revision of Prior Period, Accounting Standards Update, Adjustment | Closed Block | Accounting Standards Update 2018-12 | Other Insurance Product Line
Cumulative Effect on Opening Balance in Period of Adoption [Line Items]
Removal of Shadow Adjustments, LFPB																	(600.2)
Effect of Change in Discount Rate Assumptions																	2,561.9
Revision of Prior Period, Accounting Standards Update, Adjustment | Retained Earnings | Accounting Standards Update 2018-12
Cumulative Effect on Opening Balance in Period of Adoption [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest																	(20.6)
Revision of Prior Period, Accounting Standards Update, Adjustment | Accumulated Other Comprehensive Income (Loss) | Accounting Standards Update 2018-12
Cumulative Effect on Opening Balance in Period of Adoption [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest																	$ (6,684.4)

[1] 1The change in other assets is driven by the cost of reinsurance associated with the second phase of our Closed Block individual disability reinsurance transaction which was completed in the first quarter of 2021. In accordance with the provisions of the ASU related to non-contemporaneous reinsurance, we were then required to establish the ceded reserves using an upper-medium grade fixed-income instrument as of the reinsurance transaction date in March 2021 which resulted in higher ceded reserves compared to that which was reported historically.

[2] 2We previously reported policy and contract benefits and reserves for future policy and contract benefits liabilities in our consolidated balance sheet as of September 30, 2022 of $1,771.4 million and $42,108.7 million, respectively, resulting in total policyholder liabilities of $43,880.1 million. These balances were reclassified into new line items, future policy benefits and policyholders' account balances, which would have reported balances of $38,079.8 million and $5,800.3 million, respectively, as of September 30, 2022, resulting in total policyholder liabilities of $43,880.1 million under the historical accounting method.

[3] 1We previously reported policy and contract benefits and reserves for future policy and contract benefits liabilities in our consolidated balance sheet as of December 31, 2022 of $1,839.8 million and $42,330.2 million, respectively, resulting in total policyholder liabilities of $44,170.0 million. These balances were reclassified into new line items, future policy benefits and policyholders' account balances, which would have reported balances of $38,443.2 million and $5,726.8 million, respectively, as of December 31, 2022, resulting in total policyholder liabilities of $44,170.0 million under the historical accounting method.

[4] 5These amounts represent the portion of reinsurance recoverable related to the liability for future policy benefits. These amounts include the adjustments for the removal of shadow adjustments and for the effect of change in discount rate assumptions for the liability for future policy benefits ceded to third party reinsurers.

[5] 1Unum US excludes dental & vision and medical stop-loss product lines and Closed Block excludes our participating fund account, which represents policies issued by one of our subsidiaries prior to its 1986 conversion from a mutual stock life insurance company. The liabilities associated with these products are included within Other products.

[6] 1 Previously disclosed as Benefits and Change in Reserves for Future Benefits

[7] 1We previously reported policy and contract benefits and reserves for future policy and contract benefits liabilities in our consolidated balance sheet as of December 31, 2020 of $1,855.4 million and $49,653.0 million, respectively, resulting in total policyholder liabilities of $51,508.4 million. These balances were reclassified into new line items, future policy benefits and policyholders' account balances, which would have reported balances of $45,704.4 million and $5,804.0 million as of December 31, 2020, respectively, resulting in total policyholder liabilities of $51,508.4 million under the historical accounting method. These balances were reclassified to more closely align with the new disclosure requirements of ASU 2018-12.

[8] 2Shadow adjustments represent the adjustments related to unrealized investment gains and losses previously included in the reserves balance prior to the adoption of ASU 2018-12.

[9] 3Adjustment for loss contracts represents the adjustment for those cohorts whose net premium ratio exceeded 100 percent as of the transition date. For those cohorts, the net premiums were set equal to the gross premiums and the difference was recorded as a transition adjustment to the liability for future policy benefits.

[10] 4This amount reflects the effect of the reclassification of certain unearned premium. This amount was reclassified to more closely align with the presentation of liabilities under ASU 2018-12 and had no impact to stockholders' equity.

[11] 1The $12.3 million removal of shadow adjustments is related to the Unum US voluntary benefits product line.

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Fair Values of Financial Instruments Private Equity Partnerships (Details) - Private Equity Partnerships - USD ($) $ in Millions		Sep. 30, 2023	Dec. 31, 2022
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share
Alternative Investments		$ 1,280.9	$ 1,194.3
Alternative Investments, Unfunded Commitments		836.9	776.9
Private Credit
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share
Alternative Investments		286.7	275.0
Alternative Investments, Unfunded Commitments		130.9	104.3
Private Credit | Not Redeemable
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share
Alternative Investments	[1]	238.0	239.3
Alternative Investments, Unfunded Commitments		127.7	90.9
Private Credit | Initial 2 year lock on each new investment / Quarterly after 2 year lock with 90 days notice
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share
Alternative Investments			35.7
Alternative Investments, Unfunded Commitments			13.4
Private Credit | Quarterly / 90 days notice
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share
Alternative Investments		48.7
Alternative Investments, Unfunded Commitments		3.2
Private Equity Limited Partnership
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share
Alternative Investments		541.3	485.3
Alternative Investments, Unfunded Commitments		437.8	416.3
Private Equity Limited Partnership | Not Redeemable
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share
Alternative Investments	[2]	514.9	453.6
Alternative Investments, Unfunded Commitments		420.2	377.2
Private Equity Limited Partnership | Initial 5.5 year lock on each new investment / Quarterly after 5.5 year lock with 90 days notice
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share
Alternative Investments		26.4	31.7
Alternative Investments, Unfunded Commitments		17.6	39.1
Real Assets
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share
Alternative Investments		452.9	434.0
Alternative Investments, Unfunded Commitments		268.2	256.3
Real Assets | Not Redeemable
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share
Alternative Investments	[3]	420.3	373.9
Alternative Investments, Unfunded Commitments		268.2	256.3
Real Assets | Quarterly / 90 days notice
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share
Alternative Investments		32.6	60.1
Alternative Investments, Unfunded Commitments		$ 0.0	$ 0.0

[1] Private Credit - The limited partnerships described in this category employ various investment strategies, generally providing direct lending or other forms of debt financing including first-lien, second-lien, mezzanine, and subordinated loans. The limited partnerships have credit exposure to corporates, physical assets, and/or financial assets within a variety of industries (including manufacturing, healthcare, energy, business services, technology, materials, and retail) in North America and, to a lesser extent, outside of North America.  As of September 30, 2023, the estimated remaining life of the investments that do not allow for redemptions is approximately 63 percent in the next 3 years, 26 percent during the period from 3 to 5 years, 9 percent during the period from 5 to 10 years, and 2 percent during the period from 10 to 15 years.

[2] Private Equity - The limited partnerships described in this category employ various strategies generally investing in controlling or minority control equity positions directly in companies and/or assets across various industries (including manufacturing, healthcare, energy, business services, technology, materials, and retail), primarily in private markets within North America and, to a lesser extent, outside of North America.  As of September 30, 2023, the estimated remaining life of the investments that do not allow for redemptions is approximately 37 percent in the next 3 years, 28 percent during the period from 3 to 5 years, 28 percent during the period from 5 to 10 years, and 7 percent during the period from 10 to 15 years.

[3] Real Assets - The limited partnerships described in this category employ various strategies, which include investing in the equity and/or debt financing of physical assets, including infrastructure (energy, power, water/wastewater, communications), transportation (including airports, ports, toll roads, aircraft, railcars) and real estate in North America, Europe, South America, and Asia.  As of September 30, 2023, the estimated remaining life of the investments that do not allow for redemptions is approximately 23 percent in the next 3 years, 33 percent during period from 3 to 5 years, 42 percent during the period from 5 to 10 years, and 2 percent during the period from 10 to 15 years.

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Fair Value Measurements by Input Level (Detail) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Assets, Fair Value Disclosure
Fixed Maturity Securities	$ 34,070.7	$ 34,840.8
Derivative Assets	Other Long-term Investments	Other Long-term Investments
Equity Securities	$ 27.9	$ 25.8
Other Long-term Investments	1,506.9	1,440.1
Assets, Fair Value Disclosure	$ 35,455.2	$ 36,150.0
Liabilities
Derivative Liabilities	Other Liabilities	Other Liabilities
Liabilities, Fair Value Disclosure	$ 212.7	$ 87.9
Forwards
Liabilities
Derivative Liabilities	Other Liabilities	Other Liabilities
Foreign Exchange Contracts
Liabilities
Derivative Liabilities	Other Liabilities	Other Liabilities
Embedded Derivative in Modified Coinsurance Arrangement
Liabilities
Derivative Liabilities		Other Liabilities
Fair Value, Measurements, Recurring
Assets, Fair Value Disclosure
Other Long-term Investments	$ 1,384.5	$ 1,309.2
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1
Assets, Fair Value Disclosure
Fixed Maturity Securities	$ 8,078.6	$ 4,519.1
Derivative Assets	Other Long-term Investments	Other Long-term Investments
Equity Securities	$ 0.0	$ 0.0
Other Long-term Investments	0.0	0.0
Assets, Fair Value Disclosure	8,078.6	4,519.1
Liabilities
Liabilities, Fair Value Disclosure	$ 0.0	$ 0.0
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 | Forwards
Liabilities
Derivative Liabilities	Other Liabilities	Other Liabilities
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 | Foreign Exchange Contracts
Liabilities
Derivative Liabilities	Other Liabilities	Other Liabilities
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 | Embedded Derivative in Modified Coinsurance Arrangement
Liabilities
Derivative Liabilities		Other Liabilities
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2
Assets, Fair Value Disclosure
Fixed Maturity Securities	$ 25,838.6	$ 30,140.8
Derivative Assets	Other Long-term Investments	Other Long-term Investments
Equity Securities	$ 10.4	$ 9.6
Other Long-term Investments	85.2	98.7
Assets, Fair Value Disclosure	25,923.8	30,239.5
Liabilities
Liabilities, Fair Value Disclosure	$ 212.7	$ 74.0
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Forwards
Liabilities
Derivative Liabilities	Other Liabilities	Other Liabilities
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Foreign Exchange Contracts
Liabilities
Derivative Liabilities	Other Liabilities	Other Liabilities
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Embedded Derivative in Modified Coinsurance Arrangement
Liabilities
Derivative Liabilities		Other Liabilities
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3
Assets, Fair Value Disclosure
Fixed Maturity Securities	$ 153.5	$ 180.9
Derivative Assets	Other Long-term Investments	Other Long-term Investments
Equity Securities	$ 17.5	$ 16.2
Other Long-term Investments	18.4	16.2
Assets, Fair Value Disclosure	171.9	197.1
Liabilities
Liabilities, Fair Value Disclosure	$ 0.0	$ 13.9
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 | Forwards
Liabilities
Derivative Liabilities	Other Liabilities	Other Liabilities
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 | Foreign Exchange Contracts
Liabilities
Derivative Liabilities	Other Liabilities	Other Liabilities
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 | Embedded Derivative in Modified Coinsurance Arrangement
Liabilities
Derivative Liabilities		Other Liabilities
Fair Value, Measurements, Recurring | Fair Value Measured at Net Asset Value Per Share
Assets, Fair Value Disclosure
Fixed Maturity Securities	$ 0.0	$ 0.0
Derivative Assets	Other Long-term Investments	Other Long-term Investments
Equity Securities	$ 0.0	$ 0.0
Other Long-term Investments	1,280.9	1,194.3
Assets, Fair Value Disclosure	1,280.9	1,194.3
Liabilities
Liabilities, Fair Value Disclosure	$ 0.0	$ 0.0
Fair Value, Measurements, Recurring | Fair Value Measured at Net Asset Value Per Share | Forwards
Liabilities
Derivative Liabilities	Other Liabilities	Other Liabilities
Fair Value, Measurements, Recurring | Fair Value Measured at Net Asset Value Per Share | Foreign Exchange Contracts
Liabilities
Derivative Liabilities	Other Liabilities	Other Liabilities
Fair Value, Measurements, Recurring | Fair Value Measured at Net Asset Value Per Share | Embedded Derivative in Modified Coinsurance Arrangement
Liabilities
Derivative Liabilities		Other Liabilities
United States Government and Government Agencies and Authorities
Assets, Fair Value Disclosure
Fixed Maturity Securities	$ 575.0	$ 498.2
United States Government and Government Agencies and Authorities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1
Assets, Fair Value Disclosure
Fixed Maturity Securities	77.0	81.7
United States Government and Government Agencies and Authorities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2
Assets, Fair Value Disclosure
Fixed Maturity Securities	498.0	416.5
United States Government and Government Agencies and Authorities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3
Assets, Fair Value Disclosure
Fixed Maturity Securities	0.0	0.0
United States Government and Government Agencies and Authorities | Fair Value, Measurements, Recurring | Fair Value Measured at Net Asset Value Per Share
Assets, Fair Value Disclosure
Fixed Maturity Securities	0.0	0.0
States, Municipalities, and Political Subdivisions
Assets, Fair Value Disclosure
Fixed Maturity Securities	3,391.1	3,457.2
States, Municipalities, and Political Subdivisions | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1
Assets, Fair Value Disclosure
Fixed Maturity Securities	0.0	8.7
States, Municipalities, and Political Subdivisions | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2
Assets, Fair Value Disclosure
Fixed Maturity Securities	3,391.1	3,448.3
States, Municipalities, and Political Subdivisions | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3
Assets, Fair Value Disclosure
Fixed Maturity Securities	0.0	0.2
States, Municipalities, and Political Subdivisions | Fair Value, Measurements, Recurring | Fair Value Measured at Net Asset Value Per Share
Assets, Fair Value Disclosure
Fixed Maturity Securities	0.0	0.0
Foreign Governments
Assets, Fair Value Disclosure
Fixed Maturity Securities	819.6	827.1
Foreign Governments | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1
Assets, Fair Value Disclosure
Fixed Maturity Securities	0.0	0.0
Foreign Governments | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2
Assets, Fair Value Disclosure
Fixed Maturity Securities	819.6	827.1
Foreign Governments | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3
Assets, Fair Value Disclosure
Fixed Maturity Securities	0.0	0.0
Foreign Governments | Fair Value, Measurements, Recurring | Fair Value Measured at Net Asset Value Per Share
Assets, Fair Value Disclosure
Fixed Maturity Securities	0.0	0.0
Public Utilities
Assets, Fair Value Disclosure
Fixed Maturity Securities	4,961.2	4,956.9
Public Utilities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1
Assets, Fair Value Disclosure
Fixed Maturity Securities	650.6	160.1
Public Utilities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2
Assets, Fair Value Disclosure
Fixed Maturity Securities	4,310.6	4,796.8
Public Utilities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3
Assets, Fair Value Disclosure
Fixed Maturity Securities	0.0	0.0
Public Utilities | Fair Value, Measurements, Recurring | Fair Value Measured at Net Asset Value Per Share
Assets, Fair Value Disclosure
Fixed Maturity Securities	0.0	0.0
Mortgage/Asset-backed Securities
Assets, Fair Value Disclosure
Fixed Maturity Securities	604.9	573.3
Mortgage/Asset-backed Securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1
Assets, Fair Value Disclosure
Fixed Maturity Securities	0.0	0.0
Mortgage/Asset-backed Securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2
Assets, Fair Value Disclosure
Fixed Maturity Securities	559.7	551.3
Mortgage/Asset-backed Securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3
Assets, Fair Value Disclosure
Fixed Maturity Securities	45.2	22.0
Mortgage/Asset-backed Securities | Fair Value, Measurements, Recurring | Fair Value Measured at Net Asset Value Per Share
Assets, Fair Value Disclosure
Fixed Maturity Securities	0.0	0.0
All Other Corporate Bonds
Assets, Fair Value Disclosure
Fixed Maturity Securities	23,715.4	24,524.6
All Other Corporate Bonds | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1
Assets, Fair Value Disclosure
Fixed Maturity Securities	7,351.0	4,268.6
All Other Corporate Bonds | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2
Assets, Fair Value Disclosure
Fixed Maturity Securities	16,256.1	20,097.3
All Other Corporate Bonds | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3
Assets, Fair Value Disclosure
Fixed Maturity Securities	108.3	158.7
All Other Corporate Bonds | Fair Value, Measurements, Recurring | Fair Value Measured at Net Asset Value Per Share
Assets, Fair Value Disclosure
Fixed Maturity Securities	0.0	0.0
Redeemable Preferred Stocks
Assets, Fair Value Disclosure
Fixed Maturity Securities	3.5	3.5
Redeemable Preferred Stocks | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1
Assets, Fair Value Disclosure
Fixed Maturity Securities	0.0	0.0
Redeemable Preferred Stocks | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2
Assets, Fair Value Disclosure
Fixed Maturity Securities	3.5	3.5
Redeemable Preferred Stocks | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3
Assets, Fair Value Disclosure
Fixed Maturity Securities	0.0	0.0
Redeemable Preferred Stocks | Fair Value, Measurements, Recurring | Fair Value Measured at Net Asset Value Per Share
Assets, Fair Value Disclosure
Fixed Maturity Securities	$ 0.0	$ 0.0
Forwards
Assets, Fair Value Disclosure
Derivative Assets	Other Long-term Investments	Other Long-term Investments
Forwards | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1
Assets, Fair Value Disclosure
Derivative Assets	Other Long-term Investments	Other Long-term Investments
Forwards | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2
Assets, Fair Value Disclosure
Derivative Assets	Other Long-term Investments	Other Long-term Investments
Forwards | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3
Assets, Fair Value Disclosure
Derivative Assets	Other Long-term Investments	Other Long-term Investments
Forwards | Fair Value, Measurements, Recurring | Fair Value Measured at Net Asset Value Per Share
Assets, Fair Value Disclosure
Derivative Assets	Other Long-term Investments	Other Long-term Investments
Foreign Exchange Contracts
Assets, Fair Value Disclosure
Derivative Assets	Other Long-term Investments	Other Long-term Investments
Foreign Exchange Contracts | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1
Assets, Fair Value Disclosure
Derivative Assets	Other Long-term Investments	Other Long-term Investments
Foreign Exchange Contracts | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2
Assets, Fair Value Disclosure
Derivative Assets	Other Long-term Investments	Other Long-term Investments
Foreign Exchange Contracts | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3
Assets, Fair Value Disclosure
Derivative Assets	Other Long-term Investments	Other Long-term Investments
Foreign Exchange Contracts | Fair Value, Measurements, Recurring | Fair Value Measured at Net Asset Value Per Share
Assets, Fair Value Disclosure
Derivative Assets	Other Long-term Investments	Other Long-term Investments
Embedded Derivative in Modified Coinsurance Arrangement
Assets, Fair Value Disclosure
Derivative Assets	Other Long-term Investments
Embedded Derivative in Modified Coinsurance Arrangement | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1
Assets, Fair Value Disclosure
Derivative Assets	Other Long-term Investments
Embedded Derivative in Modified Coinsurance Arrangement | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2
Assets, Fair Value Disclosure
Derivative Assets	Other Long-term Investments
Embedded Derivative in Modified Coinsurance Arrangement | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3
Assets, Fair Value Disclosure
Derivative Assets	Other Long-term Investments
Embedded Derivative in Modified Coinsurance Arrangement | Fair Value, Measurements, Recurring | Fair Value Measured at Net Asset Value Per Share
Assets, Fair Value Disclosure
Derivative Assets	Other Long-term Investments
Private Equity Partnerships
Assets, Fair Value Disclosure
Alternative Investments	$ 1,280.9	$ 1,194.3
Private Equity Partnerships | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1
Assets, Fair Value Disclosure
Alternative Investments	0.0	0.0
Private Equity Partnerships | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2
Assets, Fair Value Disclosure
Alternative Investments	0.0	0.0
Private Equity Partnerships | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3
Assets, Fair Value Disclosure
Alternative Investments	0.0	0.0
Private Equity Partnerships | Fair Value, Measurements, Recurring | Fair Value Measured at Net Asset Value Per Share
Assets, Fair Value Disclosure
Alternative Investments	$ 1,280.9	$ 1,194.3
Derivatives | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1
Liabilities
Derivative Liabilities	Other Liabilities	Other Liabilities
Derivatives | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2
Liabilities
Derivative Liabilities	Other Liabilities	Other Liabilities
Derivatives | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3
Liabilities
Derivative Liabilities	Other Liabilities	Other Liabilities
Derivatives | Fair Value, Measurements, Recurring | Fair Value Measured at Net Asset Value Per Share
Liabilities
Derivative Liabilities	Other Liabilities	Other Liabilities

XML

Changes in Assets and Liabilities Measured at Fair Value on a Recurring Basis using Significant Unobservable Inputs (Level 3) (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Jun. 30, 2023	Dec. 31, 2022	Jun. 30, 2022	Dec. 31, 2021
Embedded Derivative in Modified Coinsurance Arrangement
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss), OCI	$ 0.0	$ 0.0	$ 0.0	$ 0.0
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss)	9.3	14.9	14.8	10.7
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs	0.9	(19.4)	0.9	(19.4)	$ (8.4)	$ (13.9)	$ (34.3)	$ (30.1)
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Earnings	9.3	14.9	14.8	10.7
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Other Comprehensive Income (Loss)	0.0	0.0	0.0	0.0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Purchases	0.0	0.0	0.0	0.0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Sales	0.0	0.0	0.0	0.0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Transfers into Level 3	0.0	0.0	0.0	0.0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Transfers out of Level 3	0.0	0.0	0.0	0.0
US States and Political Subdivisions Debt Securities
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value	0.0	0.2	0.0	0.2		0.2	0.0	13.4
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings		0.0	0.0	0.0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)		(0.1)	0.0	(0.1)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases		0.0	0.0	0.3
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales/Maturities		0.0	0.0	0.0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3		0.3	0.0	0.0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3		0.0	(0.2)	(13.4)
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss), OCI		(0.1)	0.0	(0.1)
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss)		0.0	0.0	0.0
Foreign Governments
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value		20.0		20.0			20.2	20.8
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings		0.0		0.0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)		(0.2)		(0.8)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases		0.0		0.0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales/Maturities		0.0		0.0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3		0.0		0.0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3		0.0		0.0
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss), OCI		(0.2)		(0.8)
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss)		0.0		0.0
Public Utilities
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value	0.0	13.2	0.0	13.2	0.0	0.0	13.6	44.5
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	(0.1)	(0.4)	0.1	(4.6)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)	0.1	0.0	(0.1)	2.2
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	0.0	0.0	0.0	0.0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales/Maturities	(3.9)	0.0	(7.2)	(10.8)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3	3.9	0.0	7.2	15.6
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3	0.0	0.0	0.0	(33.7)
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss), OCI	0.0	0.0	0.0	2.2
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss)	0.0	(0.4)	0.0	(4.6)
Mortgage/Asset-backed Securities
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value	45.2	11.2	45.2	11.2	24.1	22.0	11.6	187.2
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	0.0	0.0	0.0	0.0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)	(1.4)	0.6	(1.5)	(1.2)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	19.0	0.0	29.9	9.9
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales/Maturities	(1.0)	(0.3)	(2.8)	(9.5)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3	4.7	0.2	6.6	0.0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3	(0.2)	(0.9)	(9.0)	(175.2)
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss), OCI	(1.4)	0.6	(1.5)	(1.2)
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss)	0.0	0.0	0.0	0.0
All Other Corporate Bonds
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value	108.3	123.4	108.3	123.4	128.8	158.7	103.5	861.5
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	(4.6)	0.0	(5.1)	0.0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)	2.0	(5.4)	(20.6)	(29.5)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	0.0	1.3	1.5	8.8
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales/Maturities	(54.9)	(13.0)	(229.8)	(20.9)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3	87.5	57.9	276.0	18.3
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3	(50.5)	(20.9)	(72.4)	(714.8)
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss), OCI	2.0	(5.4)	(20.6)	(29.5)
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss)	0.0	0.0	0.0	0.0
Fixed Maturity Securities
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value	153.5	168.0	153.5	168.0	152.9	180.9	148.9	1,127.4
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	(4.7)	(0.4)	(5.0)	(4.6)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)	0.7	(5.1)	(22.2)	(29.4)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	19.0	1.3	31.4	19.0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales/Maturities	(59.8)	(13.3)	(239.8)	(41.2)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3	96.1	58.4	289.8	33.9
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3	(50.7)	(21.8)	(81.6)	(937.1)
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss), OCI	0.6	(5.1)	(22.1)	(29.4)
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss)	0.0	(0.4)	0.0	(4.6)
Equity Securities
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value	17.5	13.5	17.5	13.5	$ 17.5	$ 16.2	$ 10.9	$ 5.8
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	0.0	(0.1)	0.6	2.7
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)	0.0	0.0	0.0	0.0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	0.0	2.7	0.7	5.0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales/Maturities	0.0	0.0	0.0	0.0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3	0.0	0.0	0.0	0.0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3	0.0	0.0	0.0	0.0
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss), OCI	0.0	0.0	0.0	0.0
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss)	$ 0.0	$ (0.1)	$ 0.6	$ 2.7

XML

Quantitative Information Regarding Significant Unobservable Inputs (Details) $ in Millions		Sep. 30, 2023 USD ($) Rate	Dec. 31, 2022 USD ($) Rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Equity Securities | $		$ 27.9	$ 25.8
Fair Value, Inputs, Level 3 | Discounted Cash Flow | Embedded Derivative in Modified Coinsurance Arrangement
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Embedded Derivative in Modified Coinsurance Arrangement | $		$ 0.9	$ (13.9)
Fair Value, Inputs, Level 3 | Discounted Cash Flow | Embedded Derivative in Modified Coinsurance Arrangement | Weighted Average | Spread of Swap Curve
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Embedded Derivative Liability, Measurement Input | Rate	[1]	0.002	0.006
Fair Value, Inputs, Level 3 | All Other Corporate Bonds | Market Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
All Other Corporate Bonds - Private | $		$ 16.2	$ 15.3
Fair Value, Inputs, Level 3 | All Other Corporate Bonds | Market Approach | Minimum | Volatility of Credit
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
All Other Corporate Bonds - Private, Measurement Input | Rate	[2]	0.0500	0.0541
Fair Value, Inputs, Level 3 | All Other Corporate Bonds | Market Approach | Maximum | Volatility of Credit
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
All Other Corporate Bonds - Private, Measurement Input | Rate	[2]	0.0500	0.0541
Fair Value, Inputs, Level 3 | All Other Corporate Bonds | Market Approach | Weighted Average | Volatility of Credit
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
All Other Corporate Bonds - Private, Measurement Input | Rate	[2]	0.0500	0.0541
Fair Value, Inputs, Level 3 | Equity Securities | Market Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Equity Securities | $		$ 17.5	$ 16.2

[1] Represents various actuarial assumptions required to derive the liability cash flows. Fair value of embedded derivative is most often driven by the change in the weighted average credit spread to the swap curve for the assets backing the hypothetical loan

[2] Represents basis point adjustments for credit-specific factors

XML

Fair Values of Financial Instruments Carrying Amounts and Estimated Fair value of Financial Instruments Not Measured at Fair Value (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Mortgage Loans, Carrying Amount	$ 2,321.5	$ 2,435.4
Policy Loans	3,596.6	3,601.2
Long-term Debt	3,429.8	3,427.8
Liabilities, Fair Value Disclosure	212.7	87.9
Fair Value, Nonrecurring
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Mortgage Loans, Fair Value Disclosure	1,984.5	2,159.5
Mortgage Loans, Carrying Amount	2,321.5	2,435.4
Policy Loans, Fair Value Disclosure	3,654.0	3,677.0
Policy Loans	3,596.6	3,601.2
Miscellaneous Long-Term Investments, Fair Value Disclosure	16.8	18.4
Miscellaneous Long-Term Investments, Carrying Value	16.8	18.4
Financial Instruments, Financial Assets Fair Value Disclosure	5,655.3	5,854.9
Total Financial Instrument Assets Not Carried at Fair Value	5,934.9	6,055.0
Long-term Debt, Fair Value Disclosure	2,983.7	3,072.0
Long-term Debt	3,429.8	3,427.8
Unfunded Commitments	0.2	0.7
Federal Home Loan Bank Funding Agreements, Fair Value Disclosure	76.9	99.1
Payables for Collateral on Investments	76.9	99.1
Liabilities, Fair Value Disclosure	3,060.8	3,171.8
Total Financial Instrument Liabilities Not Carried at Fair Value	3,506.9	3,527.6
Fair Value, Inputs, Level 1 | Fair Value, Nonrecurring
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Mortgage Loans, Fair Value Disclosure	0.0	0.0
Policy Loans, Fair Value Disclosure	0.0	0.0
Miscellaneous Long-Term Investments, Fair Value Disclosure	0.0	0.0
Financial Instruments, Financial Assets Fair Value Disclosure	0.0	0.0
Long-term Debt, Fair Value Disclosure	2,593.2	2,288.9
Unfunded Commitments	0.0	0.0
Federal Home Loan Bank Funding Agreements, Fair Value Disclosure	0.0	0.0
Liabilities, Fair Value Disclosure	2,593.2	2,288.9
Fair Value, Inputs, Level 2 | Fair Value, Nonrecurring
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Mortgage Loans, Fair Value Disclosure	1,984.5	2,159.5
Policy Loans, Fair Value Disclosure	0.0	0.0
Miscellaneous Long-Term Investments, Fair Value Disclosure	16.3	17.1
Financial Instruments, Financial Assets Fair Value Disclosure	2,000.8	2,176.6
Long-term Debt, Fair Value Disclosure	390.5	783.1
Unfunded Commitments	0.2	0.7
Federal Home Loan Bank Funding Agreements, Fair Value Disclosure	76.9	99.1
Liabilities, Fair Value Disclosure	467.6	882.9
Fair Value, Inputs, Level 3 | Fair Value, Nonrecurring
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Mortgage Loans, Fair Value Disclosure	0.0	0.0
Policy Loans, Fair Value Disclosure	3,654.0	3,677.0
Miscellaneous Long-Term Investments, Fair Value Disclosure	0.5	1.3
Financial Instruments, Financial Assets Fair Value Disclosure	3,654.5	3,678.3
Long-term Debt, Fair Value Disclosure	0.0	0.0
Unfunded Commitments	0.0	0.0
Federal Home Loan Bank Funding Agreements, Fair Value Disclosure	0.0	0.0
Liabilities, Fair Value Disclosure	$ 0.0	$ 0.0

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Fair Value of Financial Instruments Additional Information (Detail) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Ceded Policy Loans	$ 3,229.7	$ 3,312.5
Fair Value, Inputs, Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Percentage of Total Fair Value of Fixed Maturities Securities	23.70%
Fair Value, Inputs, Level 2 | Pricing Service
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Percentage of Total Fair Value of Fixed Maturities Securities	60.60%
Fair Value, Inputs, Level 2 | Other Observable Market Data
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Percentage of Total Fair Value of Fixed Maturities Securities	14.90%
Fair Value Inputs Other Than Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Percentage of Total Fair Value of Fixed Maturities Securities	76.30%
Fair Value Inputs Level 2 Or Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Percentage of Total Fair Value of Fixed Maturities Securities	0.80%

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Amortized Cost and Fair Values of Securities by Security Type (Detail) - USD ($) $ in Millions	Sep. 30, 2023	Jun. 30, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Dec. 31, 2021
Debt Securities, Available-for-sale
Amortized Cost of Fixed Maturity Securities	$ 38,224.3		$ 37,825.2
Debt Securities, Available-for-sale, Allowance for credit losses for Fixed Maturity Securities	0.0		0.0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	424.7
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	4,578.3
Debt Securities, Available-for-sale, Total	34,070.7		34,840.8
United States Government and Government Agencies and Authorities
Debt Securities, Available-for-sale
Amortized Cost of Fixed Maturity Securities	605.2		503.8
Debt Securities, Available-for-sale, Allowance for credit losses for Fixed Maturity Securities	0.0		0.0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	7.9		20.3
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	38.1		25.9
Debt Securities, Available-for-sale, Total	575.0		498.2
States, Municipalities, and Political Subdivisions
Debt Securities, Available-for-sale
Amortized Cost of Fixed Maturity Securities	4,066.9		4,006.0
Debt Securities, Available-for-sale, Allowance for credit losses for Fixed Maturity Securities	0.0		0.0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	49.8		87.1
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	725.6		635.9
Debt Securities, Available-for-sale, Total	3,391.1		3,457.2
Foreign Governments
Debt Securities, Available-for-sale
Amortized Cost of Fixed Maturity Securities	945.7		908.1
Debt Securities, Available-for-sale, Allowance for credit losses for Fixed Maturity Securities	0.0		0.0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	12.8		34.9
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	138.9		115.9
Debt Securities, Available-for-sale, Total	819.6		827.1
Public Utilities
Debt Securities, Available-for-sale
Amortized Cost of Fixed Maturity Securities	5,410.5		5,170.9
Debt Securities, Available-for-sale, Allowance for credit losses for Fixed Maturity Securities	0.0	$ 0.0	0.0	$ 4.6	$ 4.1	$ 0.0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	67.7		141.0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	517.0		355.0
Debt Securities, Available-for-sale, Total	4,961.2		4,956.9
Mortgage/Asset-backed Securities
Debt Securities, Available-for-sale
Amortized Cost of Fixed Maturity Securities	655.0		592.1
Debt Securities, Available-for-sale, Allowance for credit losses for Fixed Maturity Securities	0.0		0.0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	4.1		8.2
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	54.2		27.0
Debt Securities, Available-for-sale, Total	604.9		573.3
All Other Corporate Bonds
Debt Securities, Available-for-sale
Amortized Cost of Fixed Maturity Securities	26,537.0		26,640.3
Debt Securities, Available-for-sale, Allowance for credit losses for Fixed Maturity Securities	0.0		0.0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	282.4		452.1
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	3,104.0		2,567.8
Debt Securities, Available-for-sale, Total	23,715.4		24,524.6
Redeemable Preferred Stocks
Debt Securities, Available-for-sale
Amortized Cost of Fixed Maturity Securities	4.0		4.0
Debt Securities, Available-for-sale, Allowance for credit losses for Fixed Maturity Securities	0.0		0.0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	0.0		0.0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	0.5		0.5
Debt Securities, Available-for-sale, Total	3.5		3.5
Fixed Maturity Securities
Debt Securities, Available-for-sale
Amortized Cost of Fixed Maturity Securities	38,224.3		37,825.2
Debt Securities, Available-for-sale, Allowance for credit losses for Fixed Maturity Securities	0.0		0.0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	424.7		743.6
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	4,578.3		3,728.0
Debt Securities, Available-for-sale, Total	$ 34,070.7		$ 34,840.8

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Length of Time Fixed Maturity Securities had been in a Gross Unrealized Loss Position (Detail) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
United States Government and Government Agencies and Authorities
Debt Securities, Available-for-sale, Unrealized Loss Position
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 245.5	$ 246.6
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	8.8	22.6
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	186.2	12.2
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	29.3	3.3
States, Municipalities, and Political Subdivisions
Debt Securities, Available-for-sale, Unrealized Loss Position
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	670.3	1,920.1
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	35.5	476.1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	1,851.7	346.6
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	690.1	159.8
Foreign Governments
Debt Securities, Available-for-sale, Unrealized Loss Position
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	152.4	160.1
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	30.8	47.9
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	224.2	176.9
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	108.1	68.0
Public Utilities
Debt Securities, Available-for-sale, Unrealized Loss Position
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	1,914.7	2,242.2
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	105.6	252.0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	1,611.2	255.2
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	411.4	103.0
Mortgage/Asset-backed Securities
Debt Securities, Available-for-sale, Unrealized Loss Position
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	189.8	386.6
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	13.2	27.0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	301.0	0.1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	41.0	0.0
All Other Corporate Bonds
Debt Securities, Available-for-sale, Unrealized Loss Position
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	5,012.4	15,865.6
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	327.8	1,799.7
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	13,492.9	2,194.1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	2,776.2	768.1
Redeemable Preferred Stocks
Debt Securities, Available-for-sale, Unrealized Loss Position
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	0.0	3.5
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0.0	0.5
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	3.5	0.0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0.5	0.0
Fixed Maturity Securities
Debt Securities, Available-for-sale, Unrealized Loss Position
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	8,185.1	20,824.7
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	521.7	2,625.8
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	17,670.7	2,985.1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 4,056.6	$ 1,102.2

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Investments Distribution of the Maturity Dates for Fixed Maturity Securities (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Debt Securities, Available-for-sale, Amortized Cost, Net of Allowance for Credit Losses, Fiscal Year Maturity
Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, Year One, Net	$ 945.9	$ 1,133.5
Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year One Through Five, Net	7,541.9	7,090.8
Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10, Net	9,393.8	10,096.7
Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 10, Net	19,687.7	18,912.1
Available for sale Securities Debt Maturities Amortized Cost Gross Subtotal, Net	37,569.3	37,233.1
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Amortized Cost, Net	655.0	592.1
Debt Securities, Available-for-sale, Amortized Cost, Net of Allowance for Credit Losses	38,224.3	37,825.2
Available for Sale Securities Unrealized Gain Position Gross Gain
Available For Sale Securities Debt Maturities Within One Year Unrealized Gain Position Gross Gain	1.3	2.9
Available For Sale Securities Debt Maturities After One Through Five Years Unrealized Gain Position Gross Gain	67.7	86.7
Available For Sale Securities Debt Maturities After Five Through Ten Years Unrealized Gain Position Gross Gain	187.5	294.8
Available For Sale Securities Debt Maturities After Ten Years Unrealized Gain Position Gross Gain	164.1	351.0
Available For Sale Securities Debt Maturities Unrealized Gain Position Gross Gain Gross Subtotal	420.6	735.4
Available For Sale Securities Debt Maturities Without Single Maturity Date Unrealized Gain Position Gross Gain	4.1	8.2
Available for sale Securities, Debt Maturities Unrealized Gain Position Gross Gain	424.7	743.6
Available for Sale Securities Unrealized Loss Position Gross Loss
Available For Sale Securities Debt Maturities Within One Year Unrealized Loss Position Gross Loss	5.0	5.7
Available For Sale Securities Debt Maturities After One Through Five Years Unrealized Loss Position Gross Loss	311.5	238.4
Available For Sale Securities Debt Maturities After Five Through Ten Years Unrealized Loss Position Gross Loss	955.4	863.8
Available For Sale Securities Debt Maturities After Ten Years Unrealized Loss Position Gross Loss	3,252.2	2,593.1
Available For Sale Securities Debt Maturities Unrealized Gain Position Gross Loss Gross Subtotal	4,524.1	3,701.0
Available For Sale Securities Debt Maturities Without Single Maturity Date Unrealized Loss Position Gross Loss	54.2	27.0
Available For Sale Securities Unrealized Loss Position Gross Loss Subtotal	4,578.3	3,728.0
Fair Value Maturity Distribution
Debt Securities, Available-for-sale, Total	34,070.7	34,840.8
Available for Sale Securities Unrealized Gain Position Fair Value
Fair Value Maturity Distribution
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Fair Value	352.8	339.1
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Fair Value	1,988.1	1,953.2
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Fair Value	2,879.0	3,538.9
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after 10 Years, Fair Value	2,880.9	5,013.2
Available for sale Securities Debt Maturities Fair Value Gross Subtotal	8,100.8	10,844.4
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Fair Value	114.1	186.6
Debt Securities, Available-for-sale, Total	8,214.9	11,031.0
Available for Sale Securities Unrealized Loss Position Fair Value
Fair Value Maturity Distribution
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Fair Value	589.4	791.6
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Fair Value	5,310.0	4,985.9
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Fair Value	5,746.9	5,988.8
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after 10 Years, Fair Value	13,718.7	11,656.8
Available for sale Securities Debt Maturities Fair Value Gross Subtotal	25,365.0	23,423.1
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Fair Value	490.8	386.7
Debt Securities, Available-for-sale, Total	$ 25,855.8	$ 23,809.8

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Investments Distribution by External Credit Rating for Fixed Maturity Securities (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Debt Securities, Available-for-sale
Fixed Maturity Securities	$ 34,070.7	$ 34,840.8
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	424.7
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	$ 4,578.3
Fixed maturity securities in unrealized loss position percent of total	100.00%
External Credit Rating, Investment Grade
Debt Securities, Available-for-sale
Fixed Maturity Securities	$ 32,659.4
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	420.6
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	$ 4,404.0
Fixed maturity securities in unrealized loss position percent of total	96.20%
External Credit Rating, Below-Investment-Grade
Debt Securities, Available-for-sale
Fixed Maturity Securities	$ 1,411.3
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	4.1
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	$ 174.3
Fixed maturity securities in unrealized loss position percent of total	3.80%

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Debt Securities, Available-for-sale, Allowance for Credit Losses Rollforward (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Debt Securities, Available-for-sale, Allowance for Credit Loss
Debt Securities, Available-for-sale, Allowance for Credit Loss, Beginning Balance			$ 0.0
Debt Securities, Available-for-sale, Allowance for Credit Loss, Ending Balance	$ 0.0		0.0
Public Utilities
Debt Securities, Available-for-sale, Allowance for Credit Loss
Debt Securities, Available-for-sale, Allowance for Credit Loss, Beginning Balance	0.0	$ 4.1	0.0	$ 0.0
Debt Securities, Available-for-sale, Credit losses on securities for which credit losses were not previously recorded			0.0	4.6
Debt Securities, Available-for-sale, Allowance for Credit Loss, Ending Balance	0.0	4.6	$ 0.0	$ 4.6
Debt Securities, Available-for-sale, Allowance for Credit Loss, Change in allowance due to change in intent to hold securities to maturity	$ 0.0	$ 0.5

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Mortgage Loans by Property Type and Geographic Region (Detail) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Mortgage Loans on Real Estate
Mortgage Loans, Carrying Amount	$ 2,321.5	$ 2,435.4
Mortgage Loans, Percent of Total	100.00%	100.00%
New England
Mortgage Loans on Real Estate
Mortgage Loans, Carrying Amount	$ 55.7	$ 52.4
Mortgage Loans, Percent of Total	2.40%	2.20%
Mid-Atlantic
Mortgage Loans on Real Estate
Mortgage Loans, Carrying Amount	$ 156.8	$ 192.4
Mortgage Loans, Percent of Total	6.80%	7.90%
East North Central
Mortgage Loans on Real Estate
Mortgage Loans, Carrying Amount	$ 300.2	$ 313.0
Mortgage Loans, Percent of Total	12.90%	12.90%
West North Central
Mortgage Loans on Real Estate
Mortgage Loans, Carrying Amount	$ 171.2	$ 181.4
Mortgage Loans, Percent of Total	7.40%	7.40%
South Atlantic
Mortgage Loans on Real Estate
Mortgage Loans, Carrying Amount	$ 553.6	$ 539.3
Mortgage Loans, Percent of Total	23.80%	22.10%
East South Central
Mortgage Loans on Real Estate
Mortgage Loans, Carrying Amount	$ 98.8	$ 101.8
Mortgage Loans, Percent of Total	4.30%	4.20%
West South Central
Mortgage Loans on Real Estate
Mortgage Loans, Carrying Amount	$ 202.7	$ 212.6
Mortgage Loans, Percent of Total	8.70%	8.70%
Mountain
Mortgage Loans on Real Estate
Mortgage Loans, Carrying Amount	$ 284.8	$ 298.7
Mortgage Loans, Percent of Total	12.30%	12.30%
Pacific
Mortgage Loans on Real Estate
Mortgage Loans, Carrying Amount	$ 497.7	$ 543.8
Mortgage Loans, Percent of Total	21.40%	22.30%
Apartment
Mortgage Loans on Real Estate
Mortgage Loans, Carrying Amount	$ 674.8	$ 688.6
Mortgage Loans, Percent of Total	29.10%	28.30%
Industrial
Mortgage Loans on Real Estate
Mortgage Loans, Carrying Amount	$ 715.5	$ 745.3
Mortgage Loans, Percent of Total	30.80%	30.60%
Office
Mortgage Loans on Real Estate
Mortgage Loans, Carrying Amount	$ 384.1	$ 423.0
Mortgage Loans, Percent of Total	16.50%	17.40%
Retail
Mortgage Loans on Real Estate
Mortgage Loans, Carrying Amount	$ 504.1	$ 534.5
Mortgage Loans, Percent of Total	21.70%	21.90%
Other Property
Mortgage Loans on Real Estate
Mortgage Loans, Carrying Amount	$ 43.0	$ 44.0
Mortgage Loans, Percent of Total	1.90%	1.80%

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Schedule of Participating Mortgage Loans by Internal Credit Rating and Loan to Value (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Mortgage Loans on Real Estate
Mortgage Loans, Carrying Amount	$ 2,321.5	$ 2,435.4
Mortgage Loans, Percent of Total	100.00%	100.00%
Loan to Value Ratio Below or Equal to 65 Percent
Mortgage Loans on Real Estate
Mortgage Loans, Carrying Amount	$ 1,351.8	$ 1,389.6
Mortgage Loans, Percent of Total	58.30%	57.00%
Loan To Value Ratio Above 65 To 75 Percent
Mortgage Loans on Real Estate
Mortgage Loans, Carrying Amount	$ 762.4	$ 937.2
Mortgage Loans, Percent of Total	32.80%	38.50%
Loan To Value Ratio Above 75 To 85 Percent
Mortgage Loans on Real Estate
Mortgage Loans, Carrying Amount	$ 137.9	$ 75.0
Mortgage Loans, Percent of Total	5.90%	3.10%
Loan To Value Ratio Above 85 Percent
Mortgage Loans on Real Estate
Mortgage Loans, Carrying Amount	$ 69.4	$ 33.6
Mortgage Loans, Percent of Total	3.00%	1.40%
AA Credit Rating
Mortgage Loans on Real Estate
Mortgage Loans, Carrying Amount	$ 85.9	$ 92.3
Mortgage Loans, Percent of Total	3.70%	3.80%
A Credit Rating
Mortgage Loans on Real Estate
Mortgage Loans, Carrying Amount	$ 885.4	$ 843.9
Mortgage Loans, Percent of Total	38.10%	34.60%
BBB Credit Rating
Mortgage Loans on Real Estate
Mortgage Loans, Carrying Amount	$ 1,309.1	$ 1,458.0
Mortgage Loans, Percent of Total	56.40%	59.90%
BB Credit Rating
Mortgage Loans on Real Estate
Mortgage Loans, Carrying Amount	$ 41.1	$ 41.2
Mortgage Loans, Percent of Total	1.80%	1.70%

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Mortgage Loans, Sorted by Applicable Credit Quality Indicators (Detail) - USD ($) $ in Millions	Sep. 30, 2023	Jun. 30, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Dec. 31, 2021
Mortgage Loans on Real Estate
Mortgage Loans, Carrying Amount	$ 2,321.5		$ 2,435.4
Loan to Value Ratio Below or Equal to 65 Percent
Mortgage Loans on Real Estate
Mortgage Loans, Carrying Amount	1,351.8		1,389.6
Loan To Value Ratio Above 65 To 75 Percent
Mortgage Loans on Real Estate
Mortgage Loans, Carrying Amount	762.4		937.2
Loan To Value Ratio Above 75 To 85 Percent
Mortgage Loans on Real Estate
Mortgage Loans, Carrying Amount	137.9		75.0
Loan To Value Ratio Above 85 Percent
Mortgage Loans on Real Estate
Mortgage Loans, Carrying Amount	69.4		33.6
Originated Five or More Years before Last Fiscal Year
Mortgage Loans on Real Estate
Mortgage Loans, Carrying Amount	1,353.5		1,104.2
Originated Four Years before Last Fiscal Year
Mortgage Loans on Real Estate
Mortgage Loans, Carrying Amount	337.0		374.7
Originated Three Years before Last Fiscal Year
Mortgage Loans on Real Estate
Mortgage Loans, Carrying Amount	166.0		343.5
Originated Two Years before Last Fiscal Year
Mortgage Loans on Real Estate
Mortgage Loans, Carrying Amount	349.3		169.3
Originated in Fiscal Year before Latest Fiscal Year
Mortgage Loans on Real Estate
Mortgage Loans, Carrying Amount	87.3		355.6
Originated in Current Fiscal Year
Mortgage Loans on Real Estate
Mortgage Loans, Carrying Amount	28.4		88.1
Commercial Real Estate
Mortgage Loans on Real Estate
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	1,360.1		1,108.5
Financing Receivable, Originated Four Years before Latest Fiscal Year	338.3		376.5
Financing Receivable, Originated Three Years before Latest Fiscal Year	166.6		344.8
Financing Receivable, Originated Two Years before Latest Fiscal Year	350.3		169.9
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	87.9		356.4
Financing Receivable, Originated in Current Fiscal Year	28.5		88.6
Financing Receivable, before Allowance for Credit Loss	2,331.7		2,444.7
Financing Receivable, Allowance for Credit Losses, Mortgage Loans	10.2		9.3
Commercial Real Estate | Loan to Value Ratio Below or Equal to 65 Percent
Mortgage Loans on Real Estate
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	882.6		782.6
Financing Receivable, Originated Four Years before Latest Fiscal Year	199.0		189.0
Financing Receivable, Originated Three Years before Latest Fiscal Year	110.8		193.9
Financing Receivable, Originated Two Years before Latest Fiscal Year	146.2		81.3
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	16.4		128.9
Financing Receivable, Originated in Current Fiscal Year	0.0		16.9
Financing Receivable, before Allowance for Credit Loss	1,355.0		1,392.6
Financing Receivable, Allowance for Credit Losses, Mortgage Loans	3.2	$ 3.3	3.0	$ 2.5	$ 2.3	$ 2.6
Commercial Real Estate | Loan To Value Ratio Above 65 To 75 Percent
Mortgage Loans on Real Estate
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	308.1		230.2
Financing Receivable, Originated Four Years before Latest Fiscal Year	139.3		181.6
Financing Receivable, Originated Three Years before Latest Fiscal Year	47.5		150.9
Financing Receivable, Originated Two Years before Latest Fiscal Year	172.0		80.1
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	71.5		227.5
Financing Receivable, Originated in Current Fiscal Year	28.5		71.7
Financing Receivable, before Allowance for Credit Loss	766.9		942.0
Financing Receivable, Allowance for Credit Losses, Mortgage Loans	4.4	4.8	4.7	5.2	4.8	4.7
Commercial Real Estate | Loan To Value Ratio Above 75 To 85 Percent
Mortgage Loans on Real Estate
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	98.3		67.5
Financing Receivable, Originated Four Years before Latest Fiscal Year	0.0		0.0
Financing Receivable, Originated Three Years before Latest Fiscal Year	8.3		0.0
Financing Receivable, Originated Two Years before Latest Fiscal Year	32.1		8.5
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0.0		0.0
Financing Receivable, Originated in Current Fiscal Year	0.0		0.0
Financing Receivable, before Allowance for Credit Loss	138.7		76.0
Financing Receivable, Allowance for Credit Losses, Mortgage Loans	0.9	0.9	1.1	0.7	0.9	0.7
Commercial Real Estate | Loan To Value Ratio Above 85 Percent
Mortgage Loans on Real Estate
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	71.1		28.2
Financing Receivable, Originated Four Years before Latest Fiscal Year	0.0		5.9
Financing Receivable, Originated Three Years before Latest Fiscal Year	0.0		0.0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0.0		0.0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0.0		0.0
Financing Receivable, Originated in Current Fiscal Year	0.0		0.0
Financing Receivable, before Allowance for Credit Loss	71.1		34.1
Financing Receivable, Allowance for Credit Losses, Mortgage Loans	1.7	$ 2.1	0.5	$ 0.3	$ 0.4	$ 0.3
Commercial Real Estate | Originated Five or More Years before Last Fiscal Year
Mortgage Loans on Real Estate
Financing Receivable, Allowance for Credit Losses, Mortgage Loans	6.6		4.3
Commercial Real Estate | Originated Four Years before Last Fiscal Year
Mortgage Loans on Real Estate
Financing Receivable, Allowance for Credit Losses, Mortgage Loans	1.3		1.8
Commercial Real Estate | Originated Three Years before Last Fiscal Year
Mortgage Loans on Real Estate
Financing Receivable, Allowance for Credit Losses, Mortgage Loans	0.6		1.3
Commercial Real Estate | Originated Two Years before Last Fiscal Year
Mortgage Loans on Real Estate
Financing Receivable, Allowance for Credit Losses, Mortgage Loans	1.0		0.6
Commercial Real Estate | Originated in Fiscal Year before Latest Fiscal Year
Mortgage Loans on Real Estate
Financing Receivable, Allowance for Credit Losses, Mortgage Loans	0.6		0.8
Commercial Real Estate | Originated in Current Fiscal Year
Mortgage Loans on Real Estate
Financing Receivable, Allowance for Credit Losses, Mortgage Loans	0.1		0.5
AA Credit Rating
Mortgage Loans on Real Estate
Mortgage Loans, Carrying Amount	85.9		92.3
AA Credit Rating | Commercial Real Estate
Mortgage Loans on Real Estate
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	75.0		53.8
Financing Receivable, Originated Four Years before Latest Fiscal Year	11.0		27.5
Financing Receivable, Originated Three Years before Latest Fiscal Year	0.0		11.1
Financing Receivable, Originated Two Years before Latest Fiscal Year	0.0		0.0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0.0		0.0
Financing Receivable, Originated in Current Fiscal Year	0.0		0.0
Financing Receivable, before Allowance for Credit Loss	86.0		92.4
A Credit Rating
Mortgage Loans on Real Estate
Mortgage Loans, Carrying Amount	885.4		843.9
A Credit Rating | Commercial Real Estate
Mortgage Loans on Real Estate
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	585.1		485.0
Financing Receivable, Originated Four Years before Latest Fiscal Year	101.0		123.3
Financing Receivable, Originated Three Years before Latest Fiscal Year	71.3		96.8
Financing Receivable, Originated Two Years before Latest Fiscal Year	90.9		35.9
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	23.4		80.6
Financing Receivable, Originated in Current Fiscal Year	15.5		24.0
Financing Receivable, before Allowance for Credit Loss	887.2		845.6
BBB Credit Rating
Mortgage Loans on Real Estate
Mortgage Loans, Carrying Amount	1,309.1		1,458.0
BBB Credit Rating | Commercial Real Estate
Mortgage Loans on Real Estate
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	657.6		534.0
Financing Receivable, Originated Four Years before Latest Fiscal Year	226.3		219.8
Financing Receivable, Originated Three Years before Latest Fiscal Year	95.3		236.9
Financing Receivable, Originated Two Years before Latest Fiscal Year	259.4		134.0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	64.5		275.8
Financing Receivable, Originated in Current Fiscal Year	13.0		64.6
Financing Receivable, before Allowance for Credit Loss	1,316.1		1,465.1
BB Credit Rating
Mortgage Loans on Real Estate
Mortgage Loans, Carrying Amount	41.1		41.2
BB Credit Rating | Commercial Real Estate
Mortgage Loans on Real Estate
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	42.4		35.7
Financing Receivable, Originated Four Years before Latest Fiscal Year	0.0		5.9
Financing Receivable, Originated Three Years before Latest Fiscal Year	0.0		0.0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0.0		0.0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0.0		0.0
Financing Receivable, Originated in Current Fiscal Year	0.0		0.0
Financing Receivable, before Allowance for Credit Loss	$ 42.4		$ 41.6

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Mortgage Loans, Allowance for Credit Losses Rollforward (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2023	Mar. 31, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Financing Receivable, Allowance for Credit Loss Rollforward, Mortgage Loans
Current Period Provisions	$ (0.9)		$ 0.4	$ 0.9	$ 0.3
Write-offs		$ 0.0		0.0
Commercial Real Estate
Financing Receivable, Allowance for Credit Loss Rollforward, Mortgage Loans
Financing Receivable, Allowance for Credit Loss, Beginning Balance		9.3		9.3
Financing Receivable, Allowance for Credit Loss, Ending Balance	10.2			10.2
Commercial Real Estate | Loan to Value Ratio Below or Equal to 65 Percent
Financing Receivable, Allowance for Credit Loss Rollforward, Mortgage Loans
Financing Receivable, Allowance for Credit Loss, Beginning Balance	3.3	3.0	2.3	3.0	2.6
Current Period Provisions	(0.1)		0.2	0.2	(0.1)
Write-offs	0.0		0.0	0.0	0.0
Recoveries	0.0		0.0	0.0	0.0
Financing Receivable, Allowance for Credit Loss, Ending Balance	3.2		2.5	3.2	2.5
Commercial Real Estate | Loan To Value Ratio Above 65 To 75 Percent
Financing Receivable, Allowance for Credit Loss Rollforward, Mortgage Loans
Financing Receivable, Allowance for Credit Loss, Beginning Balance	4.8	4.7	4.8	4.7	4.7
Current Period Provisions	(0.4)		0.4	(0.3)	0.5
Write-offs	0.0		0.0	0.0	0.0
Recoveries	0.0		0.0	0.0	0.0
Financing Receivable, Allowance for Credit Loss, Ending Balance	4.4		5.2	4.4	5.2
Commercial Real Estate | Loan To Value Ratio Above 75 To 85 Percent
Financing Receivable, Allowance for Credit Loss Rollforward, Mortgage Loans
Financing Receivable, Allowance for Credit Loss, Beginning Balance	0.9	1.1	0.9	1.1	0.7
Current Period Provisions	0.0		(0.2)	(0.2)	0.0
Write-offs	0.0		0.0	0.0	0.0
Recoveries	0.0		0.0	0.0	0.0
Financing Receivable, Allowance for Credit Loss, Ending Balance	0.9		0.7	0.9	0.7
Commercial Real Estate | Loan To Value Ratio Above 85 Percent
Financing Receivable, Allowance for Credit Loss Rollforward, Mortgage Loans
Financing Receivable, Allowance for Credit Loss, Beginning Balance	2.1	0.5	0.4	0.5	0.3
Current Period Provisions	(0.4)		(0.1)	1.2	0.0
Write-offs	0.0		0.0	0.0	0.0
Recoveries	0.0		0.0	0.0	0.0
Financing Receivable, Allowance for Credit Loss, Ending Balance	1.7		0.3	1.7	0.3
Commercial Real Estate | Loan to Value Ratio Total
Financing Receivable, Allowance for Credit Loss Rollforward, Mortgage Loans
Financing Receivable, Allowance for Credit Loss, Beginning Balance	11.1	$ 9.3	8.4	9.3	8.3
Current Period Provisions	(0.9)		0.3	0.9	0.4
Write-offs	0.0		0.0	0.0	0.0
Recoveries	0.0		0.0	0.0	0.0
Financing Receivable, Allowance for Credit Loss, Ending Balance	$ 10.2		$ 8.7	$ 10.2	$ 8.7

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Investments Remaining Contractual Maturity of Secruity Lending Agreements (Details) - Overnight and Continuous - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Transfer of Certain Financial Assets Accounted for as Secured Borrowings
Securities Loaned, Including Not Subject to Master Netting Arrangement and Assets other than Securities Transferred	$ 59.6	$ 88.5
Securities Loaned and Securities Sold under Agreement to Repurchase, Gross Including Not Subject to Master Netting Arrangement	59.6	88.5
Secured Borrowings, Gross, Difference, Amount	0.0	0.0
United States Government and Government Agencies and Authorities
Transfer of Certain Financial Assets Accounted for as Secured Borrowings
Securities Loaned, Including Not Subject to Master Netting Arrangement and Assets other than Securities Transferred	0.0	0.3
States, Municipalities, and Political Subdivisions
Transfer of Certain Financial Assets Accounted for as Secured Borrowings
Securities Loaned, Including Not Subject to Master Netting Arrangement and Assets other than Securities Transferred	0.0	0.0
Public Utilities
Transfer of Certain Financial Assets Accounted for as Secured Borrowings
Securities Loaned, Including Not Subject to Master Netting Arrangement and Assets other than Securities Transferred	2.2	6.3
All Other Corporate Bonds
Transfer of Certain Financial Assets Accounted for as Secured Borrowings
Securities Loaned, Including Not Subject to Master Netting Arrangement and Assets other than Securities Transferred	$ 57.4	$ 81.9

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Investments Federal Home Loan Bank Carrying Amount, Collateral Posted and Advances Received (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Federal Home Loan Bank Carrying Value of Common Stock, Collateral Posted and Advances
Federal Home Loan Bank Common Stock	$ 16.3	$ 17.1
Federal Home Loan Bank, Advances	76.9	99.1
Federal Home Loan Bank, Collateral Posted to FHLB	1,293.2	1,329.0
Fixed Maturity Securities
Federal Home Loan Bank Carrying Value of Common Stock, Collateral Posted and Advances
Federal Home Loan Bank, Collateral Posted to FHLB	536.4	527.1
Commercial Mortgage Loans
Federal Home Loan Bank Carrying Value of Common Stock, Collateral Posted and Advances
Federal Home Loan Bank, Collateral Posted to FHLB	$ 756.8	$ 801.9

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Investments Schedule of Financial Instrument and Derivative Offsetting (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Offsetting Derivative Assets
Derivative Asset, Fair Value, Gross Asset	$ 74.8	$ 89.1
Derivative Liabilities Offsetting Derivative Assets in Balance Sheet	0.0	0.0
Net Derivative Assets Reported in Balance Sheet	74.8	89.1
Securities Received as Collateral on Derivative Assets	(74.7)	(38.0)
Cash Collateral from Counterparties	0.0	(49.4)
Derivative Assets Net of Collateral	0.1	1.7
Offsetting Securities Loaned
Gross Securities Loaned	68.3	152.4
Assets Offsetting Securities Loaned in Balance Sheet	0.0	0.0
Net Securities Loaned Reported in Balance Sheet	68.3	152.4
Securities Given as Collateral on Securities Loaned	(8.7)	(63.9)
Cash Given as Collateral on Securities Loaned	(59.6)	(88.5)
Securities Loaned Net of Collateral	0.0	0.0
Offsetting Financial Assets
Gross Financial Assets	143.1	241.5
Financial Liabilities Offsetting Financial Assets in Balance Sheet	0.0	0.0
Net Financial Assets Reported in Balance Sheet	143.1	241.5
Securities Received as Collateral on Financial Assets	(83.4)	(101.9)
Cash Received as Collateral on Financial Assets	(59.6)	(137.9)
Financial Assets Net of Collateral	0.1	1.7
Offsetting Securities Borrowed
Gross Securities Borrowed	59.6	88.5
Liabilities Offsetting Securities Borrowed in Balance Sheet	0.0	0.0
Net Securities Borrowed Reported in Balance Sheet	59.6	88.5
Securities Received as Collateral on Securities Borrowed	(59.6)	(88.5)
Cash Received as Collateral on Securities Borrowed	0.0	0.0
Securities Borrowed Net of Collateral	0.0	0.0
Offsetting Financial Liabilities
Gross Financial Liability	272.3	162.5
Financial Assets Offsetting Financial Liabilities in Balance Sheet	0.0	0.0
Net Financial Liabilities Reported in Balance Sheet	272.3	162.5
Securities Given as Collateral on Financial Liabilities	(272.2)	(161.7)
Cash Given as Collateral on Financial Liabilities	0.0	0.0
Financial Liabilities Net of Collateral	0.1	0.8
Over the Counter
Offsetting Derivative Liabilities
Gross Derivative Liability	212.7	74.0
Derivative Assets Offsetting Derivative Liabilities in Balance Sheet	0.0	0.0
Net Derivative Liabilities Reported in Balance Sheet	212.7	74.0
Securities Given as Collateral on Derivative Liabilities	(212.6)	(73.2)
Cash Collateral to counterparties	0.0	0.0
Derivative Liabilities Net of Collateral	$ 0.1	$ 0.8

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Investments Investment Income (Detail) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Net Investment Income
Gross Investment Income, Operating		$ 542.5	$ 524.6	$ 1,619.0	$ 1,635.8
Less Investment Expenses		13.5	10.0	44.0	29.1
Less Investment Income on PFA Assets		3.0	3.0	9.1	8.9
Net Investment Income		526.0	511.6	1,565.9	1,597.8
Fixed Maturity Securities
Net Investment Income
Gross Investment Income, Operating		457.9	456.7	1,383.7	1,379.9
Derivatives
Net Investment Income
Gross Investment Income, Operating		11.6	14.9	34.5	45.1
Mortgage Loans
Net Investment Income
Gross Investment Income, Operating		22.9	24.7	69.8	77.6
Policy Loans
Net Investment Income
Gross Investment Income, Operating		5.4	5.1	15.6	14.8
Perpetual Preferred Securities
Net Investment Income
Gross Investment Income, Operating	[1]	0.4	1.1	2.2	3.2
Unrealized Gain (Loss) on Investments		(0.4)	0.5	0.1	1.5
Private Equity Partnerships
Net Investment Income
Gross Investment Income, Operating	[2]	22.6	12.6	56.7	98.6
Unrealized Gain (Loss) on Investments		29.7	14.3	72.6	106.8
Management Fee Expense		(7.1)	(1.8)	(15.9)	(8.3)
Other Long-term Investments
Net Investment Income
Gross Investment Income, Operating		2.6	3.6	7.1	7.4
Short-term Investments
Net Investment Income
Gross Investment Income, Operating		$ 19.1	$ 5.9	$ 49.4	$ 9.2

[1] The net unrealized gain (loss) recognized in net investment income for the three and nine months ended September 30, 2023 related to perpetual preferred securities still held at September 30, 2023 was $(0.4) million and $0.1 million, respectively. The net unrealized gain (loss) recognized in net investment income for the three and nine months ended September 30, 2022 related to perpetual preferred securities still held at September 30, 2022 was $0.5 million and $1.5 million, respectively.

[2] 2The net unrealized gain recognized in net investment income for the three and nine months ended September 30, 2023 related to private equity partnerships still held at September 30, 2023 was $29.7 million and $72.6 million, respectively, reduced by net management fees and partnership expenses of $(7.1) million and $(15.9) million, respectively. The net unrealized gain recognized in net investment income for the three and nine months ended September 30, 2022 related to private equity partnerships still held at September 30, 2022 was $14.3 million and $106.8 million, respectively, reduced by net management fees and partnership expenses of $(1.8) million and $(8.3) million, respectively. See Note 3 for further discussion of private equity partnerships.

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Investment Gains and Losses Reported in Consolidated Statements of Income (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Fixed Maturity Securities
Gross Gains on Sales	$ 0.4	$ 0.0	$ 3.7	$ 0.8
Gross Losses on Sales	(37.4)	(13.4)	(50.7)	(26.4)
credit losses	0.0	(0.5)	0.0	(4.6)
Other Investments
Gross Gains on Sales	0.0	0.0	6.0	1.4
Other Investments Gross Realized Losses	0.9	0.0	1.0	0.0
Impairment Loss	3.0	0.0	3.0	0.0
Current Period Provisions	(0.9)	0.4	0.9	0.3
Embedded Derivative in Modified Coinsurance Arrangement	9.2	14.9	14.7	10.7
All Other Derivatives	2.0	(0.9)	2.0	4.6
Foreign Currency Transactions	(2.2)	(4.1)	(0.8)	(8.5)
Net Investment Loss	$ (31.0)	$ (4.4)	$ (30.0)	$ (22.3)

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Investments - Additional Information (Detail)	3 Months Ended			9 Months Ended
	Sep. 30, 2023 USD ($)	Mar. 31, 2023 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)	Dec. 31, 2022 USD ($)
Schedule of Investments
Other Long-term Investments	$ 1,506,900,000			$ 1,506,900,000		$ 1,440,100,000
Accrued Investment Income	$ 704,900,000			704,900,000		615,000,000.0
Write-offs		$ 0		$ 0
Financing Receivable, Modified, Weighted Average Term Increase from Modification	18 months			18 months
Financing Receivable, Modified in Period, to Total Financing Receivables, Percentage	0.60%			0.60%
Gains (Losses) on Sales on Loan Foreclosure	$ 0		$ 0	$ 0	$ 0
Commitments to Fund Commercial Mortgage Loans	8,800,000			8,800,000
Real Estate Investment Property, Net	65,700,000			65,700,000		71,600,000
Real Estate Held-for-sale	$ 40,900,000			$ 40,900,000		40,900,000
Real Estate, Reclassification to Held-for-Sale, Carrying Value			40,900,000		40,900,000	40,900,000
Repurchase agreements - Typical Days outstanding				30
Minimum percent of the fair value of securities loaned or securities purchased under repurchase agreements be maintained as collateral	102.00%			102.00%
Gross Securities Loaned	$ 68,300,000			$ 68,300,000		152,400,000
Outstanding Repurchase Agreements	0			0		0
Off Balance Sheet Amount
Schedule of Investments
Securities Received as Collateral	12,300,000			12,300,000		69,800,000
Cash Collateral for Borrowed Securities	59,600,000			59,600,000		88,500,000
Commercial Real Estate
Schedule of Investments
Financing Receivable, before Allowance for Credit Loss, Mortgage Loans	2,331,700,000			2,331,700,000		2,444,700,000
Financing Receivable, Allowance for Credit Losses, Mortgage Loans	10,200,000			10,200,000		9,300,000
Accrued Investment Income	7,200,000			7,200,000		7,700,000
Financing Receivable, Modified in Period, Amount	14,200,000			14,200,000
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	0			0		0
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	0		$ 0	0	$ 0
Unfunded Mortgage Loan Commitments
Schedule of Investments
Allowance for Credit Losses, Unfunded Mortgage Loan Commitments	100,000			100,000		0
Variable Interest Entity, Not Primary Beneficiary
Schedule of Investments
Other Long-term Investments	1,281,400,000			1,281,400,000		1,195,300,000
Private Placement Fixed Maturity
Schedule of Investments
Fair Value Disclosure, off-Balance-Sheet Risks, Amount, Liability	53,800,000			53,800,000
Tax Credit Partnership | Variable Interest Entity, Not Primary Beneficiary
Schedule of Investments
Other Long-term Investments	500,000			500,000		1,000,000
Equity Method Investments | Variable Interest Entity, Not Primary Beneficiary
Schedule of Investments
Other Long-term Investments	$ 1,280,900,000			$ 1,280,900,000		$ 1,194,300,000
External Credit Rating, Investment Grade
Schedule of Investments
Number of Fixed Maturity Securities in an Unrealized Loss Position	968			968
Number of Fixed Maturity Securities in an Unrealized Loss Position Continuously for Over One Year	813			813
External Credit Rating, Below-Investment-Grade
Schedule of Investments
Number of Fixed Maturity Securities in an Unrealized Loss Position	93			93
Number of Fixed Maturity Securities in an Unrealized Loss Position Continuously for Over One Year	79			79

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Derivative Financial Instruments Nature and Amount of Collateral Received From and Posted To Our Derivative Counterparties (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Derivative
Cash Collateral from Counterparties	$ 0.0	$ 49.4
Carrying Value of Fixed Maturity Securities Posted as Collateral to Counterparties	74.7	38.0
Derivative Asset, Fair Value, Amount Offset Against Collateral	17.8	49.4
Derivative Liability, Subject to Master Netting Arrangement, Deduction of Financial Instrument Not Offset	170.6	44.7
Cash
Derivative
Cash Collateral from Counterparties	0.0	49.4
Cash Collateral Posted to Counterparties	4.6	5.1
Fixed Maturity Securities
Derivative
Carrying Value of Fixed Maturity Securities Posted as Collateral to Counterparties	17.8	0.0
FMS Collateral Posted to Counterparties	$ 166.0	$ 39.6

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Derivative Financial Instruments Fair Value Hedges Carrying Amount of Hedged Assets and Liabilities and Cumulative Basis Adjustments (Details) - Interest Rate Swaps - Receive Fixed/Pay Fixed - Designated as Hedging Instrument - Fair Value Hedging - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Derivative Instruments and Hedging Activities Disclosures
Hedged Asset, Statement of Financial Position [Extensible Enumeration]	Fixed Maturity Securities - at fair value (amortized cost of $38,224.3; $37,825.2; allowance for credit losses of $—; $—)	Fixed Maturity Securities - at fair value (amortized cost of $38,224.3; $37,825.2; allowance for credit losses of $—; $—)
Fixed Maturity Securities
Derivative Instruments and Hedging Activities Disclosures
Hedged Asset, Fair Value Hedge, Cumulative Increase	$ (33.5)	$ (24.8)

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Location and Fair Values of Derivative Financial Instruments (Detail) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Derivative
Derivative, Notional Amount	$ 2,324.2	$ 1,753.9
Asset Derivatives Fair Value	74.8	89.1
Other Long-term Investments
Derivative
Asset Derivatives Fair Value	75.7	89.1
Other Liabilities
Derivative
Liability Derivatives Fair Value	212.7	87.9
Designated as Hedging Instrument
Derivative
Derivative, Notional Amount	2,050.0	1,490.7
Designated as Hedging Instrument | Cash Flow Hedging
Derivative
Derivative, Notional Amount	1,446.4	932.9
Designated as Hedging Instrument | Forwards | Cash Flow Hedging
Derivative
Derivative, Notional Amount	1,290.0	764.0
Designated as Hedging Instrument | Interest Rate Swaps | Cash Flow Hedging
Derivative
Derivative, Notional Amount	156.4	168.9
Designated as Hedging Instrument | Interest Rate Swaps | Fair Value Hedging
Derivative
Derivative, Notional Amount	603.6	557.8
Designated as Hedging Instrument | Other Long-term Investments
Derivative
Asset Derivatives Fair Value	69.8	85.1
Designated as Hedging Instrument | Other Long-term Investments | Cash Flow Hedging
Derivative
Asset Derivatives Fair Value	16.7	19.1
Designated as Hedging Instrument | Other Long-term Investments | Forwards | Cash Flow Hedging
Derivative
Asset Derivatives Fair Value	0.0	1.6
Designated as Hedging Instrument | Other Long-term Investments | Interest Rate Swaps | Cash Flow Hedging
Derivative
Asset Derivatives Fair Value	16.7	17.5
Designated as Hedging Instrument | Other Long-term Investments | Interest Rate Swaps | Fair Value Hedging
Derivative
Asset Derivatives Fair Value	53.1	66.0
Designated as Hedging Instrument | Other Liabilities
Derivative
Liability Derivatives Fair Value	196.3	56.9
Designated as Hedging Instrument | Other Liabilities | Cash Flow Hedging
Derivative
Liability Derivatives Fair Value	186.6	51.5
Designated as Hedging Instrument | Other Liabilities | Forwards | Cash Flow Hedging
Derivative
Liability Derivatives Fair Value	184.1	48.4
Designated as Hedging Instrument | Other Liabilities | Interest Rate Swaps | Cash Flow Hedging
Derivative
Liability Derivatives Fair Value	2.5	3.1
Designated as Hedging Instrument | Other Liabilities | Interest Rate Swaps | Fair Value Hedging
Derivative
Liability Derivatives Fair Value	9.7	5.4
Not Designated as Hedging Instrument
Derivative
Derivative, Notional Amount	274.2	263.2
Not Designated as Hedging Instrument | Forwards
Derivative
Derivative, Notional Amount	53.2	54.3
Not Designated as Hedging Instrument | Interest Rate Swaps
Derivative
Derivative, Notional Amount	132.0	132.0
Not Designated as Hedging Instrument | Total Return Swap
Derivative
Derivative, Notional Amount	89.0	76.9
Not Designated as Hedging Instrument | Embedded Derivative in Modified Coinsurance Arrangement
Derivative
Derivative, Notional Amount	0.0	0.0
Not Designated as Hedging Instrument | Other Long-term Investments
Derivative
Asset Derivatives Fair Value	5.9	4.0
Not Designated as Hedging Instrument | Other Long-term Investments | Forwards
Derivative
Asset Derivatives Fair Value	5.0	4.0
Not Designated as Hedging Instrument | Other Long-term Investments | Interest Rate Swaps
Derivative
Asset Derivatives Fair Value	0.0	0.0
Not Designated as Hedging Instrument | Other Long-term Investments | Total Return Swap
Derivative
Asset Derivatives Fair Value	0.0	0.0
Not Designated as Hedging Instrument | Other Long-term Investments | Embedded Derivative in Modified Coinsurance Arrangement
Derivative
Asset Derivatives Fair Value	0.9	0.0
Not Designated as Hedging Instrument | Other Liabilities
Derivative
Liability Derivatives Fair Value	16.4	31.0
Not Designated as Hedging Instrument | Other Liabilities | Forwards
Derivative
Liability Derivatives Fair Value	0.0	0.1
Not Designated as Hedging Instrument | Other Liabilities | Interest Rate Swaps
Derivative
Liability Derivatives Fair Value	16.4	17.0
Not Designated as Hedging Instrument | Other Liabilities | Total Return Swap
Derivative
Liability Derivatives Fair Value	0.0	0.0
Not Designated as Hedging Instrument | Other Liabilities | Embedded Derivative in Modified Coinsurance Arrangement
Derivative
Liability Derivatives Fair Value	$ 0.0	$ 13.9

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Derivative Financial Instruments Location of Gains and Losses Designated as Hedging Instruments, Consolidated Statements of Income (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Derivative Instruments, Gain (Loss)
Net Investment Income	$ 526.0	$ 511.6	$ 1,565.9	$ 1,597.8
Net Investment Gain (Loss)	(31.0)	(4.4)	(30.0)	(22.3)
Interest and Debt Expense	48.6	47.0	145.6	141.3
Derivative, Gain (Loss) on Derivative, Net	(2.0)	0.9	(2.0)	(4.6)
Designated as Hedging Instrument | Interest Rate Swaps | Net Investment Income | Cash Flow Hedging
Derivative Instruments, Gain (Loss)
Net Investment Income	49.7	50.2	148.2	150.9
Derivative, Gain (Loss) on Derivative, Net	8.3	14.1	27.7	40.5
Designated as Hedging Instrument | Interest Rate Swaps | Net Investment Gain (Loss) | Cash Flow Hedging
Derivative Instruments, Gain (Loss)
Net Investment Gain (Loss)	0.0	0.0	0.8	0.0
Derivative, Gain (Loss) on Derivative, Net	0.0	0.0	0.0	0.0
Designated as Hedging Instrument | Interest Rate Swaps | Interest and Debt Expense | Cash Flow Hedging
Derivative Instruments, Gain (Loss)
Interest and Debt Expense	0.7	0.7	2.2	2.1
Derivative, Gain (Loss) on Derivative, Net	0.0	0.0	0.0	0.0
Designated as Hedging Instrument | Foreign Exchange Contracts | Net Investment Income | Cash Flow Hedging
Derivative Instruments, Gain (Loss)
Net Investment Income	2.3	2.7	7.3	8.3
Derivative, Gain (Loss) on Derivative, Net	0.4	(1.5)	0.6	(0.9)
Designated as Hedging Instrument | Foreign Exchange Contracts | Net Investment Income | Fair Value Hedging
Derivative Instruments, Gain (Loss)
Net Investment Income	3.9	2.9	10.3	8.7
Derivative, Gain (Loss) on Derivative, Net	3.1	1.0	6.7	5.1
Designated as Hedging Instrument | Foreign Exchange Contracts | Net Investment Gain (Loss) | Cash Flow Hedging
Derivative Instruments, Gain (Loss)
Net Investment Gain (Loss)	(0.1)	(0.5)	(0.1)	(0.5)
Derivative, Gain (Loss) on Derivative, Net	0.0	0.0	0.1	0.0
Designated as Hedging Instrument | Foreign Exchange Contracts | Net Investment Gain (Loss) | Fair Value Hedging
Derivative Instruments, Gain (Loss)
Net Investment Gain (Loss)	(15.2)	(29.6)	(8.7)	(62.5)
Derivative, Gain (Loss) on Derivative, Net	15.2	29.6	8.7	62.5
Designated as Hedging Instrument | Foreign Exchange Contracts | Interest and Debt Expense | Cash Flow Hedging
Derivative Instruments, Gain (Loss)
Interest and Debt Expense	0.0	0.0	0.0	0.0
Derivative, Gain (Loss) on Derivative, Net	0.0	0.0	0.0	0.0
Designated as Hedging Instrument | Foreign Exchange Contracts | Interest and Debt Expense | Fair Value Hedging
Derivative Instruments, Gain (Loss)
Interest and Debt Expense	0.0	0.0	0.0	0.0
Derivative, Gain (Loss) on Derivative, Net	0.0	0.0	0.0	0.0
Designated as Hedging Instrument | Forwards | Net Investment Income | Cash Flow Hedging
Derivative Instruments, Gain (Loss)
Net Investment Income	3.9	0.2	7.7	0.2
Derivative, Gain (Loss) on Derivative, Net	(0.1)	0.0	(0.1)	0.0
Designated as Hedging Instrument | Forwards | Net Investment Gain (Loss) | Cash Flow Hedging
Derivative Instruments, Gain (Loss)
Net Investment Gain (Loss)	0.0	0.0	0.0	0.0
Derivative, Gain (Loss) on Derivative, Net	0.0	0.0	0.0	0.0
Designated as Hedging Instrument | Forwards | Interest and Debt Expense | Cash Flow Hedging
Derivative Instruments, Gain (Loss)
Interest and Debt Expense	0.0	0.0	0.0	0.0
Derivative, Gain (Loss) on Derivative, Net	$ 0.0	$ 0.0	$ 0.0	$ 0.0

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Location of Gains and Losses on Derivative Instruments Designated as Cash Flow Hedging Instruments (Detail) - Designated as Hedging Instrument - Cash Flow Hedging - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Derivative Instruments, Gain (Loss)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax	$ (155.5)	$ (27.2)	$ (159.0)	$ (20.6)
Forwards
Derivative Instruments, Gain (Loss)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax	(158.9)	(34.3)	(159.7)	(32.0)
Foreign Exchange Contracts
Derivative Instruments, Gain (Loss)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax	$ 3.4	$ 7.1	$ 0.7	$ 11.4

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Gains and Losses on Derivatives Not Designated as Hedging Instruments (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Derivative Instruments, Gain (Loss)
Net Gain (Loss) on Derivatives	$ 2.0	$ (0.9)	$ 2.0	$ 4.6
Not Designated as Hedging Instrument
Derivative Instruments, Gain (Loss)
Net Gain (Loss) on Derivatives	11.2	14.0	16.7	15.3
Foreign Exchange Contracts | Not Designated as Hedging Instrument
Derivative Instruments, Gain (Loss)
Net Gain (Loss) on Derivatives	2.0	(0.9)	2.0	4.6
Embedded Derivative in Modified Coinsurance Arrangement | Not Designated as Hedging Instrument
Derivative Instruments, Gain (Loss)
Net Gain (Loss) on Derivatives	9.2	14.9	14.7	10.7
Total Return Swap | Not Designated as Hedging Instrument
Derivative Instruments, Gain (Loss)
Net Gain (Loss) on Derivatives	$ 4.1	$ 4.3	$ (4.7)	$ 23.0

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Derivative Financial Instruments - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Derivative
Aggregate fair value of all derivative instruments with credit risk-related contingent features in a liability position	$ 212.7		$ 212.7		$ 74.0
Derivative, Notional Amount	2,324.2		2,324.2		1,753.9
Approximate amount of net deferred gains on derivative instruments expected to be amortized during the next twelve months			21.4
Component of Derivative Gain (Loss) Excluded from the Assessment of Hedge Effectiveness	(19.4)	$ 0.2	(26.6)	$ 13.9
Discontinued Hedge Accounting Due to Instrument No Longer Qualifying as Fair Value Hedge	0.0	$ 0.0	$ 0.0	$ 0.0
Maximum Length of Time Hedged in Cash Flow Hedge			40 years 3 months
Designated as Hedging Instrument
Derivative
Derivative, Notional Amount	2,050.0		$ 2,050.0		1,490.7
Not Designated as Hedging Instrument
Derivative
Derivative, Notional Amount	274.2		274.2		263.2
Cash Flow Hedging | Designated as Hedging Instrument
Derivative
Derivative, Notional Amount	1,446.4		1,446.4		932.9
Interest Rate Swaps | Not Designated as Hedging Instrument
Derivative
Derivative, Notional Amount	132.0		132.0		132.0
Interest Rate Swaps | Cash Flow Hedging | Designated as Hedging Instrument
Derivative
Derivative, Notional Amount	156.4		156.4		168.9
Interest Rate Swaps | Fair Value Hedging | Designated as Hedging Instrument
Derivative
Derivative, Notional Amount	603.6		603.6		557.8
Forwards | Not Designated as Hedging Instrument
Derivative
Derivative, Notional Amount	53.2		53.2		54.3
Forwards | Cash Flow Hedging | Designated as Hedging Instrument
Derivative
Derivative, Notional Amount	1,290.0		1,290.0		764.0
Total Return Swap | Not Designated as Hedging Instrument
Derivative
Derivative, Notional Amount	89.0		89.0		76.9
Embedded Derivative in Modified Coinsurance Arrangement | Not Designated as Hedging Instrument
Derivative
Derivative, Notional Amount	0.0		0.0		0.0
Receive Fixed/Pay Fixed | Interest Rate Swaps | Not Designated as Hedging Instrument
Derivative
Derivative, Notional Amount	132.0		132.0		132.0
Receive Fixed/Pay Fixed | Interest Rate Swaps | Cash Flow Hedging | Designated as Hedging Instrument
Derivative
Derivative, Notional Amount	156.4		156.4		168.9
Receive Fixed/Pay Fixed | Interest Rate Swaps | Fair Value Hedging | Designated as Hedging Instrument
Derivative
Derivative, Notional Amount	603.6		603.6		557.8
Credit Exposure
Derivative
Credit Exposure on Derivatives	$ 0.0		$ 0.0		$ 1.7

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Schedule of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Accumulated Other Comprehensive Income (Loss)
Balance at Beginning of Period	$ (3,457.6)	$ (3,809.5)	$ (3,448.3)	$ (5,164.6)
Other Comprehensive Income (Loss) Before Reclassifications	282.8	194.2	278.0	1,551.7
Amounts Reclassified from Accumulated Other Comprehensive Income or Loss	(24.2)	(4.3)	(19.7)	(1.9)
Net Other Comprehensive Income (Loss)	307.0	198.5	297.7	1,553.6
Balance at End of Period	(3,150.6)	(3,611.0)	(3,150.6)	(3,611.0)
Net Unrealized Gain (Loss) on Securities
Accumulated Other Comprehensive Income (Loss)
Balance at Beginning of Period	(2,762.6)	(1,560.4)	(3,028.4)	4,014.4
Other Comprehensive Income (Loss) Before Reclassifications	(1,215.1)	(1,937.0)	(957.2)	(7,524.6)
Amounts Reclassified from Accumulated Other Comprehensive Income or Loss	(29.3)	(11.1)	(37.2)	(23.9)
Net Other Comprehensive Income (Loss)	(1,185.8)	(1,925.9)	(920.0)	(7,500.7)
Balance at End of Period	(3,948.4)	(3,486.3)	(3,948.4)	(3,486.3)
Effect of Change in Discount Rate Assumptions on the LFPB
Accumulated Other Comprehensive Income (Loss)
Balance at Beginning of Period	0.1	(1,541.2)	313.9	(8,570.7)
Other Comprehensive Income (Loss) Before Reclassifications	1,688.4	2,222.9	1,374.6	9,252.4
Amounts Reclassified from Accumulated Other Comprehensive Income or Loss	0.0	0.0	0.0	0.0
Net Other Comprehensive Income (Loss)	1,688.4	2,222.9	1,374.6	9,252.4
Balance at End of Period	1,688.5	681.7	1,688.5	681.7
Net Gain (Loss) on Hedges
Accumulated Other Comprehensive Income (Loss)
Balance at Beginning of Period	(33.3)	46.4	(9.6)	61.8
Other Comprehensive Income (Loss) Before Reclassifications	(137.9)	(23.0)	(146.4)	(17.1)
Amounts Reclassified from Accumulated Other Comprehensive Income or Loss	6.5	9.9	21.7	31.2
Net Other Comprehensive Income (Loss)	(144.4)	(32.9)	(168.1)	(48.3)
Balance at End of Period	(177.7)	13.5	(177.7)	13.5
Foreign Currency Translation Adjustment
Accumulated Other Comprehensive Income (Loss)
Balance at Beginning of Period	(327.1)	(367.5)	(390.1)	(274.1)
Other Comprehensive Income (Loss) Before Reclassifications	(55.1)	(71.5)	7.9	(164.9)
Amounts Reclassified from Accumulated Other Comprehensive Income or Loss	0.0	0.0	0.0	0.0
Net Other Comprehensive Income (Loss)	(55.1)	(71.5)	7.9	(164.9)
Balance at End of Period	(382.2)	(439.0)	(382.2)	(439.0)
Unrecognized Pension and Postretirement Benefit Costs
Accumulated Other Comprehensive Income (Loss)
Balance at Beginning of Period	(334.7)	(386.8)	(334.1)	(396.0)
Other Comprehensive Income (Loss) Before Reclassifications	2.5	2.8	(0.9)	5.9
Amounts Reclassified from Accumulated Other Comprehensive Income or Loss	(1.4)	(3.1)	(4.2)	(9.2)
Net Other Comprehensive Income (Loss)	3.9	5.9	3.3	15.1
Balance at End of Period	$ (330.8)	$ (380.9)	$ (330.8)	$ (380.9)

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Schedule of Reclassifications Out of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Reclassification Adjustment out of Accumulated Other Comprehensive Income
Net Investment Loss	$ (31.0)	$ (4.4)	$ (30.0)	$ (22.3)
Net Investment Income	526.0	511.6	1,565.9	1,597.8
Other Expenses	(271.8)	(243.9)	(818.6)	(734.4)
Income Tax Expense (Benefit)	59.7	131.3	258.2	258.5
Net Income	202.0	510.3	953.2	1,118.0
credit losses	0.0	(0.5)	0.0	(4.6)
Reclassification out of Accumulated Other Comprehensive Income (Loss) | Net Unrealized Gain (Loss) on Securities
Reclassification Adjustment out of Accumulated Other Comprehensive Income
Net Investment Loss	(37.0)	(13.4)	(47.0)	(25.6)
Income Before Income Tax	(37.0)	(13.9)	(47.0)	(30.2)
Income Tax Expense (Benefit)	(7.7)	(2.8)	(9.8)	(6.3)
Net Income	(29.3)	(11.1)	(37.2)	(23.9)
credit losses	0.0	(0.5)	0.0	(4.6)
Reclassification out of Accumulated Other Comprehensive Income (Loss) | Net Gain (Loss) on Hedges
Reclassification Adjustment out of Accumulated Other Comprehensive Income
Income Before Income Tax	8.2	12.6	27.5	39.5
Income Tax Expense (Benefit)	1.7	2.7	5.8	8.3
Net Income	(6.5)	(9.9)	(21.7)	(31.2)
Reclassification out of Accumulated Other Comprehensive Income (Loss) | Net Gain (Loss) on Hedges | Interest Rate Swaps
Reclassification Adjustment out of Accumulated Other Comprehensive Income
Net Investment Income	8.3	14.1	27.6	40.5
Reclassification out of Accumulated Other Comprehensive Income (Loss) | Net Gain (Loss) on Hedges | Foreign Exchange Contracts
Reclassification Adjustment out of Accumulated Other Comprehensive Income
Net Investment Loss	0.0	0.0	0.1	0.0
Net Investment Income	(0.1)	(1.5)	(0.2)	(1.0)
Reclassification out of Accumulated Other Comprehensive Income (Loss) | Amortization of Net Actuarial Loss
Reclassification Adjustment out of Accumulated Other Comprehensive Income
Other Expenses	(1.8)	(4.0)	(5.4)	(11.8)
Reclassification out of Accumulated Other Comprehensive Income (Loss) | Prior Service Credit
Reclassification Adjustment out of Accumulated Other Comprehensive Income
Other Expenses	0.0	0.1	0.1	0.2
Reclassification out of Accumulated Other Comprehensive Income (Loss) | Unrecognized Pension and Postretirement Benefit Costs
Reclassification Adjustment out of Accumulated Other Comprehensive Income
Income Before Income Tax	(1.8)	(3.9)	(5.3)	(11.6)
Income Tax Expense (Benefit)	(0.4)	(0.8)	(1.1)	(2.4)
Net Income	$ (1.4)	$ (3.1)	$ (4.2)	$ (9.2)

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Liability for Future Policy Benefit Activity (Details) - USD ($) $ in Millions		9 Months Ended
		Sep. 30, 2023		Sep. 30, 2022		Dec. 31, 2022		Dec. 31, 2021	Jan. 01, 2021
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Future Policy Benefits		$ 36,502.4		$ 37,808.0	[1]	$ 38,577.1	[2]
Operating Segments
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change, balance beginning of year		12,426.2		15,881.3
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance at beginning of period		12,695.3		13,186.2
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) from Cash Flow Change						1,499.2		$ (101.9)
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) of Actual Variance from Expected Experience						(121.8)		(252.3)
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Reinsurance, after Cash Flow Change						14,072.7		12,832.0
Liability for Future Policy Benefit, Expected Net Premium, Issuance		861.2		727.2
Liability for Future Policy Benefit, Expected Net Premium, Interest Income		430.8		430.0
Liability for Future Policy Benefit, Expected Net Premium, Net Premium Collected		(1,164.9)		(1,184.1)
Liability for Future Policy Benefit, Expected Net Premium, Increase (Decrease) for Other Change		(0.1)		(49.5)
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance at end of period		14,199.7		12,755.6
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax		(709.0)		(418.5)
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change		13,490.7		12,337.1
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change, beginning of year		48,929.4		65,305.0
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, beginning of period		49,689.0		50,397.2
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change						1,702.0		(92.4)
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) of Actual Variance from Expected Experience						(356.4)		(459.6)
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change						$ 51,034.6		$ 49,845.2
Liability for Future Policy Benefit, Expected Future Policy Benefit, Issuance	[3]	2,547.0		2,602.7
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense		1,670.3		1,689.3
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment		(4,106.1)		(4,112.1)
Liability for Future Policy Benefit, Expected Future Policy Benefit, Increase (Decrease) for Other Change		19.6		(485.7)
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, end of period		51,165.4		49,539.4
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax		(3,111.7)		(1,484.8)
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change, end of year		48,053.7		48,054.6
Liability for Future Policy Benefit, before Reinsurance, before Other		34,563.0		35,717.5
Liability for Future Policy Benefits, Other Contracts		1,703.3		1,872.7
Liability for Future Policy Benefit, before Reinsurance, after Other		36,266.3		37,590.2					$ 55,585.4
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance		7,449.0		8,154.6					10,496.0	[4]
Liability for Future Policy Benefit, after Reinsurance		28,817.3		29,435.6					45,089.4
Liability for Future Policy Benefit, Gross Premium Income		7,278.4		7,033.8
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense		1,239.5		1,259.3
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance		105,306.1		97,202.5
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance		38,581.4		35,301.8
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance		$ 25,435.2		$ 23,835.8
Liability for Future Policy Benefit, Weighted-Average Interest Accretion Rate		4.80%		4.80%
Liability for Future Policy Benefit, Current Weighted-Average Discount Rate		5.60%		5.20%		5.00%		2.50%
Liability for Future Policy Benefit, Weighted-Average Duration		11 years 6 months		11 years
Future Policy Benefits		$ 36,502.4		$ 37,808.0
Unum US
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change, balance beginning of year		2,071.1		2,619.1
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance at beginning of period		2,166.0		2,311.9
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) from Cash Flow Change						$ 185.7		$ (97.1)
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) of Actual Variance from Expected Experience						(111.8)		(117.1)
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Reinsurance, after Cash Flow Change						2,239.9		2,097.7
Liability for Future Policy Benefit, Expected Net Premium, Issuance		422.6		249.5
Liability for Future Policy Benefit, Expected Net Premium, Interest Income		57.7		60.5
Liability for Future Policy Benefit, Expected Net Premium, Net Premium Collected		(255.9)		(259.1)
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance at end of period		2,464.3		2,148.6
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax		(181.6)		(116.6)
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change		2,282.7		2,032.0
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change, beginning of year		11,698.2		14,564.4
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, beginning of period		12,177.3		12,671.7
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change						77.8		(228.2)
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) of Actual Variance from Expected Experience						(367.9)		(328.5)
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change						11,887.2		12,115.0
Liability for Future Policy Benefit, Expected Future Policy Benefit, Issuance		1,707.4		1,688.0
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense		340.9		363.1
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment		(1,936.3)		(1,993.1)
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, end of period		11,999.2		12,173.0
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax		(816.4)		(580.3)
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change, end of year		11,182.8		11,592.7
Liability for Future Policy Benefit, before Reinsurance, before Other		8,900.1		9,560.7
Liability for Future Policy Benefits, Other Contracts		29.9		41.2
Liability for Future Policy Benefit, before Reinsurance, after Other		8,930.0		9,601.9					12,861.4
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance		200.3		255.9					357.7	[4]
Liability for Future Policy Benefit, after Reinsurance		8,729.7		9,346.0					12,503.7
Liability for Future Policy Benefit, Gross Premium Income		4,679.9		4,499.5
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense		283.2		302.6
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance		17,943.5		17,869.4
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance		11,019.3		9,468.4
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance		$ 7,763.3		$ 6,886.3
Liability for Future Policy Benefit, Weighted-Average Interest Accretion Rate		4.20%		4.10%
Liability for Future Policy Benefit, Current Weighted-Average Discount Rate		5.30%		4.90%
Liability for Future Policy Benefit, Weighted-Average Duration		6 years 10 months 24 days		6 years 9 months 18 days
Future Policy Benefits	[5]	$ 8,930.0		$ 9,601.9
Unum International
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change, balance beginning of year		197.1		260.5
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance at beginning of period		246.8		258.1
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) from Cash Flow Change						(5.1)		(0.3)
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) of Actual Variance from Expected Experience						12.2		5.4
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Reinsurance, after Cash Flow Change						253.9		263.2
Liability for Future Policy Benefit, Expected Net Premium, Issuance		16.9		13.4
Liability for Future Policy Benefit, Expected Net Premium, Interest Income		6.9		6.5
Liability for Future Policy Benefit, Expected Net Premium, Net Premium Collected		(16.9)		(17.3)
Liability for Future Policy Benefit, Expected Net Premium, Increase (Decrease) for Other Change		(0.1)		(49.5)
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance at end of period		260.7		216.3
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax		(37.6)		(46.9)
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change		223.1		169.4
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change, beginning of year		2,231.4		3,181.8
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, beginning of period		2,495.5		2,703.8
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change						17.7		(20.1)
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) of Actual Variance from Expected Experience						(9.2)		23.5
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change						2,504.0		2,707.2
Liability for Future Policy Benefit, Expected Future Policy Benefit, Issuance	[6]	277.3		287.9
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense		47.7		50.0
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment		(307.5)		(270.3)
Liability for Future Policy Benefit, Expected Future Policy Benefit, Increase (Decrease) for Other Change		19.6		(485.7)
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, end of period		2,541.1		2,289.1
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax		(297.1)		(345.4)
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change, end of year		2,244.0		1,943.7
Liability for Future Policy Benefit, before Reinsurance, before Other		2,020.9		1,774.3
Liability for Future Policy Benefits, Other Contracts		30.3		24.9
Liability for Future Policy Benefit, before Reinsurance, after Other		2,051.2		1,799.2					3,203.4
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance		69.4		57.8					132.5	[4]
Liability for Future Policy Benefit, after Reinsurance		1,981.8		1,741.4					3,070.9
Liability for Future Policy Benefit, Gross Premium Income		667.7		590.4
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense		40.8		43.5
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance		4,012.8		3,642.0
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance		1,035.7		814.9
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance		$ 676.8		$ 545.1
Liability for Future Policy Benefit, Weighted-Average Interest Accretion Rate		4.00%		3.90%
Liability for Future Policy Benefit, Current Weighted-Average Discount Rate		5.40%		5.90%
Liability for Future Policy Benefit, Weighted-Average Duration		8 years 7 months 6 days		8 years 6 months
Future Policy Benefits		$ 2,051.2		$ 1,799.2
Colonial Life
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change, balance beginning of year		3,745.4		4,597.0
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance at beginning of period		4,046.4		4,158.9
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) from Cash Flow Change						(322.7)		(32.3)
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) of Actual Variance from Expected Experience						(77.1)		(105.8)
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Reinsurance, after Cash Flow Change						3,646.6		4,020.8
Liability for Future Policy Benefit, Expected Net Premium, Issuance		421.7		464.3
Liability for Future Policy Benefit, Expected Net Premium, Interest Income		94.3		99.4
Liability for Future Policy Benefit, Expected Net Premium, Net Premium Collected		(454.0)		(483.6)
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance at end of period		3,708.6		4,100.9
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax		(348.7)		(353.2)
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change		3,359.9		3,747.7
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change, beginning of year		5,581.1		7,054.8
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, beginning of period		6,163.9		6,201.5
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change						(402.9)		(85.9)
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) of Actual Variance from Expected Experience						(90.1)		(133.4)
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change						5,670.9		5,982.2
Liability for Future Policy Benefit, Expected Future Policy Benefit, Issuance		461.1		502.9
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense		161.0		165.1
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment		(462.1)		(467.4)
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, end of period		5,830.9		6,182.8
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax		(731.9)		(667.5)
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change, end of year		5,099.0		5,515.3
Liability for Future Policy Benefit, before Reinsurance, before Other		1,739.1		1,767.6
Liability for Future Policy Benefits, Other Contracts		24.3		23.9
Liability for Future Policy Benefit, before Reinsurance, after Other		1,763.4		1,791.5					2,528.6
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance		0.9		1.3					4.4	[4]
Liability for Future Policy Benefit, after Reinsurance		1,762.5		1,790.2					2,524.2
Liability for Future Policy Benefit, Gross Premium Income		1,240.3		1,228.3
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense		66.7		65.7
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance		9,568.2		9,984.0
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance		11,847.5		12,205.8
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance		$ 8,684.1		$ 8,996.4
Liability for Future Policy Benefit, Weighted-Average Interest Accretion Rate		4.30%		4.40%
Liability for Future Policy Benefit, Current Weighted-Average Discount Rate		5.70%		5.30%
Liability for Future Policy Benefit, Weighted-Average Duration		16 years 10 months 24 days		17 years 10 months 24 days
Future Policy Benefits		$ 1,763.4		$ 1,791.5
Closed Block
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change, balance beginning of year		6,412.6		8,404.7
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance at beginning of period		6,236.1		6,457.3
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) from Cash Flow Change						1,641.3		27.8
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) of Actual Variance from Expected Experience						54.9		(34.8)
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Reinsurance, after Cash Flow Change						7,932.3		6,450.3
Liability for Future Policy Benefit, Expected Net Premium, Interest Income		271.9		263.6
Liability for Future Policy Benefit, Expected Net Premium, Net Premium Collected		(438.1)		(424.1)
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance at end of period		7,766.1		6,289.8
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax		(141.1)		98.2
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change		7,625.0		6,388.0
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change, beginning of year		29,418.7		40,504.0
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, beginning of period		28,852.3		28,820.2
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change						2,009.4		241.8
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) of Actual Variance from Expected Experience						110.8		(21.2)
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change						30,972.5		29,040.8
Liability for Future Policy Benefit, Expected Future Policy Benefit, Issuance		101.2		123.9
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense		1,120.7		1,111.1
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment		(1,400.2)		(1,381.3)
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, end of period		30,794.2		28,894.5
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax		(1,266.3)		108.4
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change, end of year		29,527.9		29,002.9
Liability for Future Policy Benefit, before Reinsurance, before Other		21,902.9		22,614.9
Liability for Future Policy Benefits, Other Contracts		1,618.8		1,782.7
Liability for Future Policy Benefit, before Reinsurance, after Other		23,521.7		24,397.6					36,992.0
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance		7,178.3		7,839.5					10,001.4	[4]
Liability for Future Policy Benefit, after Reinsurance		16,343.4		16,558.1					26,990.6
Liability for Future Policy Benefit, Gross Premium Income		690.5		715.6
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense		848.8		847.5
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance		73,781.6		65,707.1
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance		14,678.9		12,812.7
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance		$ 8,311.0		$ 7,408.0
Liability for Future Policy Benefit, Weighted-Average Interest Accretion Rate		5.20%		5.20%
Liability for Future Policy Benefit, Current Weighted-Average Discount Rate		5.80%		5.30%
Liability for Future Policy Benefit, Weighted-Average Duration		13 years 3 months 18 days		12 years 6 months
Future Policy Benefits	[5]	$ 23,521.7		$ 24,397.6
Other Products [Member]
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Future Policy Benefits	[5]	236.1		217.8
Group Disability | Unum US
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change, balance beginning of year		0.0		0.0
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance at beginning of period		0.0		0.0
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) from Cash Flow Change						0.0		0.0
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) of Actual Variance from Expected Experience						0.0		0.0
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Reinsurance, after Cash Flow Change						0.0		0.0
Liability for Future Policy Benefit, Expected Net Premium, Issuance		0.0		0.0
Liability for Future Policy Benefit, Expected Net Premium, Interest Income		0.0		0.0
Liability for Future Policy Benefit, Expected Net Premium, Net Premium Collected		0.0		0.0
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance at end of period		0.0		0.0
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax		0.0		0.0
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change		0.0		0.0
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change, beginning of year		5,533.3		6,725.7
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, beginning of period		5,793.1		6,158.3
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change						(100.2)		(102.0)
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) of Actual Variance from Expected Experience						(187.8)		(174.1)
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change						5,505.1		5,882.2
Liability for Future Policy Benefit, Expected Future Policy Benefit, Issuance		907.1	[7]	1,038.9	[8]
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense		137.6		162.2
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment		(1,186.8)		(1,228.7)
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, end of period		5,363.0		5,854.6
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax		(310.1)		(284.6)
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change, end of year		5,052.9		5,570.0
Liability for Future Policy Benefit, before Reinsurance, before Other		5,052.9		5,570.0
Liability for Future Policy Benefits, Other Contracts		0.5		0.5
Liability for Future Policy Benefit, before Reinsurance, after Other		5,053.4		5,570.5					7,295.7
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance		32.8		36.8					58.3
Liability for Future Policy Benefit, after Reinsurance		5,020.6		5,533.7					7,237.4
Liability for Future Policy Benefit, Gross Premium Income		2,210.4		2,073.5
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense		137.6		162.2
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance		6,474.2		7,077.3
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance		0.0		0.0
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance		$ 0.0		$ 0.0
Liability for Future Policy Benefit, Weighted-Average Interest Accretion Rate		4.00%		3.80%
Liability for Future Policy Benefit, Current Weighted-Average Discount Rate		5.40%		5.00%
Liability for Future Policy Benefit, Weighted-Average Duration		4 years 3 months 18 days		4 years 4 months 24 days
Group Life and AD&D | Unum US
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change, balance beginning of year		$ 0.0		$ 0.0
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance at beginning of period		0.0		0.0
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) from Cash Flow Change						0.0		0.0
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) of Actual Variance from Expected Experience						0.0		0.0
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Reinsurance, after Cash Flow Change						0.0		0.0
Liability for Future Policy Benefit, Expected Net Premium, Issuance		0.0		0.0
Liability for Future Policy Benefit, Expected Net Premium, Interest Income		0.0		0.0
Liability for Future Policy Benefit, Expected Net Premium, Net Premium Collected		0.0		0.0
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance at end of period		0.0		0.0
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax		0.0		0.0
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change		0.0		0.0
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change, beginning of year		972.6		1,124.1
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, beginning of period		998.5		1,058.3
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change						0.0		(32.9)
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) of Actual Variance from Expected Experience						(28.2)		(29.0)
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change						970.3		996.4
Liability for Future Policy Benefit, Expected Future Policy Benefit, Issuance		356.1	[7]	377.5	[8]
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense		15.8		18.8
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment		(402.1)		(424.1)
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, end of period		940.1		968.6
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax		(35.6)		(32.5)
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change, end of year		904.5		936.1
Liability for Future Policy Benefit, before Reinsurance, before Other		904.5		936.1
Liability for Future Policy Benefits, Other Contracts		1.0		0.9
Liability for Future Policy Benefit, before Reinsurance, after Other		905.5		937.0					1,127.3
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance		6.2		6.0					3.0
Liability for Future Policy Benefit, after Reinsurance		899.3		931.0					1,124.3
Liability for Future Policy Benefit, Gross Premium Income		1,403.2		1,396.0
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense		15.8		18.8
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance		1,069.2		1,124.5
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance		0.0		0.0
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance		$ 0.0		$ 0.0
Liability for Future Policy Benefit, Weighted-Average Interest Accretion Rate		2.30%		2.40%
Liability for Future Policy Benefit, Current Weighted-Average Discount Rate		3.10%		3.10%
Liability for Future Policy Benefit, Weighted-Average Duration		2 years 8 months 12 days		3 years 1 month 6 days
Individual Disability | Unum US
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change, balance beginning of year		$ 1,202.9		$ 1,494.3
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance at beginning of period		1,228.1		1,279.6
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) from Cash Flow Change						5.0		(73.7)
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) of Actual Variance from Expected Experience						(13.6)		(37.4)
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Reinsurance, after Cash Flow Change						1,219.5		1,168.5
Liability for Future Policy Benefit, Expected Net Premium, Issuance		164.0		123.5
Liability for Future Policy Benefit, Expected Net Premium, Interest Income		36.3		38.2
Liability for Future Policy Benefit, Expected Net Premium, Net Premium Collected		(131.7)		(130.5)
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance at end of period		1,288.1		1,199.7
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax		(62.2)		(37.2)
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change		1,225.9		1,162.5
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change, beginning of year		3,192.8		4,017.3
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, beginning of period		3,244.5		3,253.3
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change						7.9		(53.4)
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) of Actual Variance from Expected Experience						(42.3)		(43.1)
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change						3,210.1		3,156.8
Liability for Future Policy Benefit, Expected Future Policy Benefit, Issuance		173.8		131.1
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense		123.2		116.9
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment		(203.5)		(192.8)
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, end of period		3,303.6		3,212.0
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax		(190.0)		(95.7)
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change, end of year		3,113.6		3,116.3
Liability for Future Policy Benefit, before Reinsurance, before Other		1,887.7		1,953.8
Liability for Future Policy Benefits, Other Contracts		26.0		24.7
Liability for Future Policy Benefit, before Reinsurance, after Other		1,913.7		1,978.5					2,767.7
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance		148.1		189.7					260.6
Liability for Future Policy Benefit, after Reinsurance		1,765.6		1,788.8					2,507.1
Liability for Future Policy Benefit, Gross Premium Income		474.2		446.9
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense		86.9		78.7
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance		5,292.7		5,112.5
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance		5,701.8		5,461.8
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance		$ 4,099.5		$ 3,916.2
Liability for Future Policy Benefit, Weighted-Average Interest Accretion Rate		5.10%		5.10%
Liability for Future Policy Benefit, Current Weighted-Average Discount Rate		5.70%		5.20%
Liability for Future Policy Benefit, Weighted-Average Duration		9 years 7 months 6 days		9 years 4 months 24 days
Voluntary Benefits | Unum US
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change, balance beginning of year		$ 868.2		$ 1,124.8
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance at beginning of period		937.9		1,032.3
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) from Cash Flow Change						180.7		(23.4)
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) of Actual Variance from Expected Experience						(98.2)		(79.7)
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Reinsurance, after Cash Flow Change						1,020.4		929.2
Liability for Future Policy Benefit, Expected Net Premium, Issuance		258.6		126.0
Liability for Future Policy Benefit, Expected Net Premium, Interest Income		21.4		22.3
Liability for Future Policy Benefit, Expected Net Premium, Net Premium Collected		(124.2)		(128.6)
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance at end of period		1,176.2		948.9
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax		(119.4)		(79.4)
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change		1,056.8		869.5
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change, beginning of year		1,999.5		2,697.3
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, beginning of period		2,141.2		2,201.8
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change						170.1		(39.9)
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) of Actual Variance from Expected Experience						(109.6)		(82.3)
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change						2,201.7		2,079.6
Liability for Future Policy Benefit, Expected Future Policy Benefit, Issuance		270.4		140.5
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense		64.3		65.2
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment		(143.9)		(147.5)
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, end of period		2,392.5		2,137.8
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax		(280.7)		(167.5)
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change, end of year		2,111.8		1,970.3
Liability for Future Policy Benefit, before Reinsurance, before Other		1,055.0		1,100.8
Liability for Future Policy Benefits, Other Contracts		2.4		15.1
Liability for Future Policy Benefit, before Reinsurance, after Other		1,057.4		1,115.9					1,659.2
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance		13.2		23.4					35.7
Liability for Future Policy Benefit, after Reinsurance		1,044.2		1,092.5					1,623.5
Liability for Future Policy Benefit, Gross Premium Income		592.1		583.1
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense		42.9		42.9
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance		5,107.4		4,555.1
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance		5,317.5		4,006.6
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance		$ 3,663.8		$ 2,970.1
Liability for Future Policy Benefit, Weighted-Average Interest Accretion Rate		5.00%		5.10%
Liability for Future Policy Benefit, Current Weighted-Average Discount Rate		5.70%		5.30%
Liability for Future Policy Benefit, Weighted-Average Duration		18 years 2 months 12 days		18 years
Other Insurance Product Line | Closed Block
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change, balance beginning of year		$ 0.0		$ 0.0
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance at beginning of period		0.0		0.0
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) from Cash Flow Change						0.0		0.0
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) of Actual Variance from Expected Experience						0.0		0.0
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Reinsurance, after Cash Flow Change						0.0		0.0
Liability for Future Policy Benefit, Expected Net Premium, Interest Income		0.0		0.0
Liability for Future Policy Benefit, Expected Net Premium, Net Premium Collected		0.0		0.0
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance at end of period		0.0		0.0
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax		0.0		0.0
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change		0.0		0.0
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change, beginning of year		8,218.8		10,414.4
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, beginning of period		8,630.7		8,949.4
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change						0.0		216.9
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) of Actual Variance from Expected Experience						4.1		18.1
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change						8,634.8		9,184.4
Liability for Future Policy Benefit, Expected Future Policy Benefit, Issuance		101.2	[9]	123.9	[10]
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense		270.0		281.4
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment		(776.0)		(832.6)
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, end of period		8,230.0		8,757.1
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax		(687.0)		(521.2)
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change, end of year		7,543.0		8,235.9
Liability for Future Policy Benefit, before Reinsurance, before Other		7,543.0		8,235.9
Liability for Future Policy Benefits, Other Contracts		1,606.0	[11]	1,759.9	[12]
Liability for Future Policy Benefit, before Reinsurance, after Other		9,149.0		9,995.8					14,251.1
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance		7,173.7		7,834.2					9,957.0
Liability for Future Policy Benefit, after Reinsurance		1,975.3		2,161.6					4,294.1
Liability for Future Policy Benefit, Gross Premium Income		169.3		192.6
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense		270.0		281.4
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance		12,109.6		12,950.4
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance		0.0		0.0
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance		$ 0.0		$ 0.0
Liability for Future Policy Benefit, Weighted-Average Interest Accretion Rate		4.60%		4.60%
Liability for Future Policy Benefit, Current Weighted-Average Discount Rate		5.70%		5.30%
Liability for Future Policy Benefit, Weighted-Average Duration		7 years 3 months 18 days		7 years 4 months 24 days
Long-term Care | Closed Block
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change, balance beginning of year		$ 6,412.6		$ 8,404.7
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance at beginning of period		6,236.1		6,457.3
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) from Cash Flow Change						1,641.3		27.8
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) of Actual Variance from Expected Experience						54.9		(34.8)
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Reinsurance, after Cash Flow Change						7,932.3		6,450.3
Liability for Future Policy Benefit, Expected Net Premium, Interest Income		271.9		263.6
Liability for Future Policy Benefit, Expected Net Premium, Net Premium Collected		(438.1)		(424.1)
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance at end of period		7,766.1		6,289.8
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax		(141.1)		98.2
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change		7,625.0		6,388.0
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change, beginning of year		21,199.9		30,089.6
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, beginning of period		20,221.6		19,870.8
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change						2,009.4		24.9
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) of Actual Variance from Expected Experience						106.7		(39.3)
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change						$ 22,337.7		$ 19,856.4
Liability for Future Policy Benefit, Expected Future Policy Benefit, Issuance		0.0		0.0
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense		850.7		829.7
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment		(624.2)		(548.7)
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, end of period		22,564.2		20,137.4
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax		(579.3)		629.6
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change, end of year		21,984.9		20,767.0
Liability for Future Policy Benefit, before Reinsurance, before Other		14,359.9		14,379.0
Liability for Future Policy Benefits, Other Contracts		12.8		22.8
Liability for Future Policy Benefit, before Reinsurance, after Other		14,372.7		14,401.8					22,740.9
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance		4.6		5.3					44.4
Liability for Future Policy Benefit, after Reinsurance		14,368.1		14,396.5					$ 22,696.5
Liability for Future Policy Benefit, Gross Premium Income		521.2		523.0
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense		578.8		566.1
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance		61,672.0		52,756.7
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance		14,678.9		12,812.7
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance		$ 8,311.0		$ 7,408.0
Liability for Future Policy Benefit, Weighted-Average Interest Accretion Rate		5.60%		5.50%
Liability for Future Policy Benefit, Current Weighted-Average Discount Rate		5.80%		5.30%
Liability for Future Policy Benefit, Weighted-Average Duration		16 years 7 months 6 days		15 years 8 months 12 days
Liability for Future Policy Benefit, Adverse Development, Expense		$ (215.5)

[1] 2We previously reported policy and contract benefits and reserves for future policy and contract benefits liabilities in our consolidated balance sheet as of September 30, 2022 of $1,771.4 million and $42,108.7 million, respectively, resulting in total policyholder liabilities of $43,880.1 million. These balances were reclassified into new line items, future policy benefits and policyholders' account balances, which would have reported balances of $38,079.8 million and $5,800.3 million, respectively, as of September 30, 2022, resulting in total policyholder liabilities of $43,880.1 million under the historical accounting method.

[2] 1We previously reported policy and contract benefits and reserves for future policy and contract benefits liabilities in our consolidated balance sheet as of December 31, 2022 of $1,839.8 million and $42,330.2 million, respectively, resulting in total policyholder liabilities of $44,170.0 million. These balances were reclassified into new line items, future policy benefits and policyholders' account balances, which would have reported balances of $38,443.2 million and $5,726.8 million, respectively, as of December 31, 2022, resulting in total policyholder liabilities of $44,170.0 million under the historical accounting method.

[3] 1Issuances include new policy issuances for most product lines. For our Unum US group disability, Unum US group life and AD&D and Closed Block - All Other product lines and certain of our Unum International product lines, this line represents new claim incurrals.

[4] 5These amounts represent the portion of reinsurance recoverable related to the liability for future policy benefits. These amounts include the adjustments for the removal of shadow adjustments and for the effect of change in discount rate assumptions for the liability for future policy benefits ceded to third party reinsurers.

[5] 1Unum US excludes dental & vision and medical stop-loss product lines and Closed Block excludes our participating fund account, which represents policies issued by one of our subsidiaries prior to its 1986 conversion from a mutual stock life insurance company. The liabilities associated with these products are included within Other products.

[6] 1Issuances for Unum International primarily represents new claim incurrals.

[7] 1Issuances include new policy issuances for most product lines. Issuances for Unum US group disability and Unum US group life and AD&D represents new claim incurrals.

[8] 1Issuances include new policy issuances for most product lines. Issuances for Unum US group disability and Unum US group life and AD&D represents new claim incurrals.

[9] 1Issuances for Closed Block - All Other represents new claim incurrals.

[10] 1Issuances for Closed Block - All Other represents new claim incurrals.

[11] 2Other for Closed Block - All Other primarily includes our closed block group pension products and certain of our ceded closed block individual life products.

[12] 2Other for Closed Block - All Other primarily includes our closed block group pension products and certain of our ceded closed block individual life products.

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Policyholder Account Balance (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2023		Sep. 30, 2022		Dec. 31, 2022	[2]
Policyholder Account Balance [Roll Forward]
Policyholders' Account Balances	$ 5,744.5		$ 5,812.8	[1]	$ 5,740.2
Operating Segments
Policyholder Account Balance [Roll Forward]
Policyholder Account Balance, before Reserves in excess of Account Balance, Beginning of Year	5,598.6		5,679.6
Policyholder Account Balance, Premium Received	134.5		143.1
Policyholder Account Balance, Policy Charge	(181.0)	[3]	(184.7)	[4]
Policyholder Account Balance, Surrender and Withdrawal	(64.2)		(72.2)
Policyholder Account Balance, Benefit Payment	(204.1)		(203.3)
Policyholder Account Balance, Interest Expense	281.7		276.3
Policyholder Account Balance, Increase (Decrease) from Other Change	30.8		36.1
Policyholder Account Balance, before Reserves in excess of Account Balance, End of Period	5,596.3		5,674.9
Policyholder Account Balance, Reserves in excess of Account Balance	148.2		137.9
Policyholders' Account Balances	5,744.5		5,812.8
Policyholder Account Balance, Reinsurance recoverable	4,199.3		4,267.0
Policyholder Account Balance, After reinsurance recoverable	$ 1,545.2		$ 1,545.8
Policyholder Account Balance, Weighted Average Crediting Rate	6.90%		6.70%
Policyholder Account Balance, Net Amount at Risk	$ 15,308.7	[5]	$ 16,419.3	[6]
Policyholder Account Balance, Cash Surrender Value	5,412.4		5,475.4
Unum US | Voluntary Benefits
Policyholder Account Balance [Roll Forward]
Policyholder Account Balance, before Reserves in excess of Account Balance, Beginning of Year	586.8		598.7
Policyholder Account Balance, Premium Received	44.9		49.2
Policyholder Account Balance, Policy Charge	(45.8)	[3]	(48.8)	[4]
Policyholder Account Balance, Surrender and Withdrawal	(23.6)		(25.6)
Policyholder Account Balance, Benefit Payment	(7.5)		(8.0)
Policyholder Account Balance, Interest Expense	17.0		17.8
Policyholder Account Balance, Increase (Decrease) from Other Change	6.7		5.8
Policyholder Account Balance, before Reserves in excess of Account Balance, End of Period	578.5		589.1
Policyholder Account Balance, Reserves in excess of Account Balance	99.2		89.4
Policyholders' Account Balances	677.7		678.5
Policyholder Account Balance, Reinsurance recoverable	1.0		1.0
Policyholder Account Balance, After reinsurance recoverable	$ 676.7		$ 677.5
Policyholder Account Balance, Weighted Average Crediting Rate	4.00%		4.10%
Policyholder Account Balance, Net Amount at Risk	$ 4,600.0	[5]	$ 5,008.7	[6]
Policyholder Account Balance, Cash Surrender Value	568.9		585.4
Colonial Life
Policyholder Account Balance [Roll Forward]
Policyholder Account Balance, before Reserves in excess of Account Balance, Beginning of Year	852.4		849.2
Policyholder Account Balance, Premium Received	64.4		68.8
Policyholder Account Balance, Policy Charge	(56.3)	[3]	(58.9)	[4]
Policyholder Account Balance, Surrender and Withdrawal	(28.5)		(27.9)
Policyholder Account Balance, Benefit Payment	(5.6)		(6.0)
Policyholder Account Balance, Interest Expense	25.7		25.6
Policyholder Account Balance, Increase (Decrease) from Other Change	(0.2)		0.1
Policyholder Account Balance, before Reserves in excess of Account Balance, End of Period	851.9		850.9
Policyholder Account Balance, Reserves in excess of Account Balance	16.6		17.5
Policyholders' Account Balances	868.5		868.4
Policyholder Account Balance, Reinsurance recoverable	0.0		0.1
Policyholder Account Balance, After reinsurance recoverable	$ 868.5		$ 868.3
Policyholder Account Balance, Weighted Average Crediting Rate	4.10%		4.10%
Policyholder Account Balance, Net Amount at Risk	$ 8,901.6	[5]	$ 9,490.5	[6]
Policyholder Account Balance, Cash Surrender Value	810.1		796.8
Closed Block | Other Insurance Product Line
Policyholder Account Balance [Roll Forward]
Policyholder Account Balance, before Reserves in excess of Account Balance, Beginning of Year	4,159.4		4,231.7
Policyholder Account Balance, Premium Received	25.2		25.1
Policyholder Account Balance, Policy Charge	(78.9)	[3]	(77.0)	[4]
Policyholder Account Balance, Surrender and Withdrawal	(12.1)		(18.7)
Policyholder Account Balance, Benefit Payment	(191.0)		(189.3)
Policyholder Account Balance, Interest Expense	239.0		232.9
Policyholder Account Balance, Increase (Decrease) from Other Change	24.3		30.2
Policyholder Account Balance, before Reserves in excess of Account Balance, End of Period	4,165.9		4,234.9
Policyholder Account Balance, Reserves in excess of Account Balance	32.4		31.0
Policyholders' Account Balances	4,198.3		4,265.9
Policyholder Account Balance, Reinsurance recoverable	4,198.3		4,265.9
Policyholder Account Balance, After reinsurance recoverable	$ 0.0		$ 0.0
Policyholder Account Balance, Weighted Average Crediting Rate	8.00%		7.60%
Policyholder Account Balance, Net Amount at Risk	$ 1,807.1	[5]	$ 1,920.1	[6]
Policyholder Account Balance, Cash Surrender Value	$ 4,033.4		$ 4,093.2

[1] 2We previously reported policy and contract benefits and reserves for future policy and contract benefits liabilities in our consolidated balance sheet as of September 30, 2022 of $1,771.4 million and $42,108.7 million, respectively, resulting in total policyholder liabilities of $43,880.1 million. These balances were reclassified into new line items, future policy benefits and policyholders' account balances, which would have reported balances of $38,079.8 million and $5,800.3 million, respectively, as of September 30, 2022, resulting in total policyholder liabilities of $43,880.1 million under the historical accounting method.

[2] 1We previously reported policy and contract benefits and reserves for future policy and contract benefits liabilities in our consolidated balance sheet as of December 31, 2022 of $1,839.8 million and $42,330.2 million, respectively, resulting in total policyholder liabilities of $44,170.0 million. These balances were reclassified into new line items, future policy benefits and policyholders' account balances, which would have reported balances of $38,443.2 million and $5,726.8 million, respectively, as of December 31, 2022, resulting in total policyholder liabilities of $44,170.0 million under the historical accounting method.

[3] 1Contracts included in the policyholder account balances are generally charged a premium and/or monthly assessments on the basis of the account balance.

[4] 1Contracts included in the policyholder account balances are generally charged a premium and/or monthly assessments on the basis of the account balance.

[5] 2For those guarantees of benefits that are payable in the event of death, the net amount at risk is generally defined as the current guaranteed minimum death benefit in excess of the current account balance at the balance sheet date.

[6] 2For those guarantees of benefits that are payable in the event of death, the net amount at risk is generally defined as the current guaranteed minimum death benefit in excess of the current account balance at the balance sheet date.

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Policyholder Account Balance, Guaranteed Minimum Crediting (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022	Sep. 30, 2022	Dec. 31, 2021
Operating Segments
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder Account Balance, before Reserves in excess of Account Balance, End of Period	$ 5,596.3	$ 5,598.6	$ 5,674.9	$ 5,679.6
Policyholder Account Balance, Guaranteed Minimum Credit Rating | Operating Segments
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder Account Balance, before Reserves in excess of Account Balance, End of Period	2,067.6		5,451.1
Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0001 to 0050 | Operating Segments
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder Account Balance, before Reserves in excess of Account Balance, End of Period	3,501.6		217.2
Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0051 to 0150 | Operating Segments
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder Account Balance, before Reserves in excess of Account Balance, End of Period	27.1		6.6
Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0151 and Greater | Operating Segments
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder Account Balance, before Reserves in excess of Account Balance, End of Period	0.0		0.0
Colonial Life
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder Account Balance, before Reserves in excess of Account Balance, End of Period	851.9	852.4	850.9	849.2
Colonial Life | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 0400 and 0500
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder Account Balance, before Reserves in excess of Account Balance, End of Period	851.9		850.9
Colonial Life | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 0400 and 0500 | Policyholder Account Balance, Guaranteed Minimum Credit Rating
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder Account Balance, before Reserves in excess of Account Balance, End of Period	845.8		845.0
Colonial Life | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 0400 and 0500 | Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0001 to 0050
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder Account Balance, before Reserves in excess of Account Balance, End of Period	6.1		5.9
Colonial Life | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 0400 and 0500 | Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0051 to 0150
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder Account Balance, before Reserves in excess of Account Balance, End of Period	0.0		0.0
Colonial Life | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 0400 and 0500 | Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0151 and Greater
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder Account Balance, before Reserves in excess of Account Balance, End of Period	0.0		0.0
Other Insurance Product Line | Closed Block
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder Account Balance, before Reserves in excess of Account Balance, End of Period	4,165.9	4,159.4	4,234.9	4,231.7
Other Insurance Product Line | Closed Block | Policyholder Account Balance, Guaranteed Minimum Credit Rating
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder Account Balance, before Reserves in excess of Account Balance, End of Period	831.8		4,199.2
Other Insurance Product Line | Closed Block | Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0001 to 0050
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder Account Balance, before Reserves in excess of Account Balance, End of Period	3,307.0		29.1
Other Insurance Product Line | Closed Block | Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0051 to 0150
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder Account Balance, before Reserves in excess of Account Balance, End of Period	27.1		6.6
Other Insurance Product Line | Closed Block | Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0151 and Greater
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder Account Balance, before Reserves in excess of Account Balance, End of Period	0.0		0.0
Other Insurance Product Line | Closed Block | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 0300 and 0599
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder Account Balance, before Reserves in excess of Account Balance, End of Period	1,639.6		1,744.1
Other Insurance Product Line | Closed Block | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 0300 and 0599 | Policyholder Account Balance, Guaranteed Minimum Credit Rating
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder Account Balance, before Reserves in excess of Account Balance, End of Period	431.3		1,708.4
Other Insurance Product Line | Closed Block | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 0300 and 0599 | Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0001 to 0050
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder Account Balance, before Reserves in excess of Account Balance, End of Period	1,181.2		29.1
Other Insurance Product Line | Closed Block | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 0300 and 0599 | Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0051 to 0150
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder Account Balance, before Reserves in excess of Account Balance, End of Period	27.1		6.6
Other Insurance Product Line | Closed Block | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 0300 and 0599 | Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0151 and Greater
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder Account Balance, before Reserves in excess of Account Balance, End of Period	0.0		0.0
Other Insurance Product Line | Closed Block | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 0600 and 0899
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder Account Balance, before Reserves in excess of Account Balance, End of Period	30.6		30.5
Other Insurance Product Line | Closed Block | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 0600 and 0899 | Policyholder Account Balance, Guaranteed Minimum Credit Rating
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder Account Balance, before Reserves in excess of Account Balance, End of Period	2.1		30.5
Other Insurance Product Line | Closed Block | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 0600 and 0899 | Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0001 to 0050
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder Account Balance, before Reserves in excess of Account Balance, End of Period	28.5		0.0
Other Insurance Product Line | Closed Block | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 0600 and 0899 | Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0051 to 0150
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder Account Balance, before Reserves in excess of Account Balance, End of Period	0.0		0.0
Other Insurance Product Line | Closed Block | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 0600 and 0899 | Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0151 and Greater
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder Account Balance, before Reserves in excess of Account Balance, End of Period	0.0		0.0
Other Insurance Product Line | Closed Block | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 0900 and 1199
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder Account Balance, before Reserves in excess of Account Balance, End of Period	2,313.1		2,289.6
Other Insurance Product Line | Closed Block | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 0900 and 1199 | Policyholder Account Balance, Guaranteed Minimum Credit Rating
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder Account Balance, before Reserves in excess of Account Balance, End of Period	398.4		2,289.6
Other Insurance Product Line | Closed Block | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 0900 and 1199 | Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0001 to 0050
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder Account Balance, before Reserves in excess of Account Balance, End of Period	1,914.7		0.0
Other Insurance Product Line | Closed Block | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 0900 and 1199 | Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0051 to 0150
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder Account Balance, before Reserves in excess of Account Balance, End of Period	0.0		0.0
Other Insurance Product Line | Closed Block | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 0900 and 1199 | Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0151 and Greater
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder Account Balance, before Reserves in excess of Account Balance, End of Period	0.0		0.0
Other Insurance Product Line | Closed Block | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 1200 and 1500
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder Account Balance, before Reserves in excess of Account Balance, End of Period	182.6		170.7
Other Insurance Product Line | Closed Block | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 1200 and 1500 | Policyholder Account Balance, Guaranteed Minimum Credit Rating
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder Account Balance, before Reserves in excess of Account Balance, End of Period	0.0		170.7
Other Insurance Product Line | Closed Block | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 1200 and 1500 | Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0001 to 0050
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder Account Balance, before Reserves in excess of Account Balance, End of Period	182.6		0.0
Other Insurance Product Line | Closed Block | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 1200 and 1500 | Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0051 to 0150
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder Account Balance, before Reserves in excess of Account Balance, End of Period	0.0		0.0
Other Insurance Product Line | Closed Block | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 1200 and 1500 | Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0151 and Greater
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder Account Balance, before Reserves in excess of Account Balance, End of Period	0.0		0.0
Voluntary Benefits | Unum US
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder Account Balance, before Reserves in excess of Account Balance, End of Period	578.5	$ 586.8	589.1	$ 598.7
Voluntary Benefits | Unum US | Policyholder Account Balance, Guaranteed Minimum Credit Rating
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder Account Balance, before Reserves in excess of Account Balance, End of Period	390.0		406.9
Voluntary Benefits | Unum US | Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0001 to 0050
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder Account Balance, before Reserves in excess of Account Balance, End of Period	188.5		182.2
Voluntary Benefits | Unum US | Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0051 to 0150
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder Account Balance, before Reserves in excess of Account Balance, End of Period	0.0		0.0
Voluntary Benefits | Unum US | Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0151 and Greater
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder Account Balance, before Reserves in excess of Account Balance, End of Period	0.0		0.0
Voluntary Benefits | Unum US | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 0300 to 0399
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder Account Balance, before Reserves in excess of Account Balance, End of Period	91.6		95.3
Voluntary Benefits | Unum US | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 0300 to 0399 | Policyholder Account Balance, Guaranteed Minimum Credit Rating
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder Account Balance, before Reserves in excess of Account Balance, End of Period	91.6		95.3
Voluntary Benefits | Unum US | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 0300 to 0399 | Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0001 to 0050
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder Account Balance, before Reserves in excess of Account Balance, End of Period	0.0		0.0
Voluntary Benefits | Unum US | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 0300 to 0399 | Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0051 to 0150
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder Account Balance, before Reserves in excess of Account Balance, End of Period	0.0		0.0
Voluntary Benefits | Unum US | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 0300 to 0399 | Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0151 and Greater
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder Account Balance, before Reserves in excess of Account Balance, End of Period	0.0		0.0
Voluntary Benefits | Unum US | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 0400 and 0499
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder Account Balance, before Reserves in excess of Account Balance, End of Period	453.9		459.6
Voluntary Benefits | Unum US | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 0400 and 0499 | Policyholder Account Balance, Guaranteed Minimum Credit Rating
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder Account Balance, before Reserves in excess of Account Balance, End of Period	265.4		277.4
Voluntary Benefits | Unum US | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 0400 and 0499 | Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0001 to 0050
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder Account Balance, before Reserves in excess of Account Balance, End of Period	188.5		182.2
Voluntary Benefits | Unum US | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 0400 and 0499 | Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0051 to 0150
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder Account Balance, before Reserves in excess of Account Balance, End of Period	0.0		0.0
Voluntary Benefits | Unum US | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 0400 and 0499 | Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0151 and Greater
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder Account Balance, before Reserves in excess of Account Balance, End of Period	0.0		0.0
Voluntary Benefits | Unum US | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 0500 and 0600
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder Account Balance, before Reserves in excess of Account Balance, End of Period	33.0		34.2
Voluntary Benefits | Unum US | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 0500 and 0600 | Policyholder Account Balance, Guaranteed Minimum Credit Rating
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder Account Balance, before Reserves in excess of Account Balance, End of Period	33.0		34.2
Voluntary Benefits | Unum US | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 0500 and 0600 | Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0001 to 0050
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder Account Balance, before Reserves in excess of Account Balance, End of Period	0.0		0.0
Voluntary Benefits | Unum US | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 0500 and 0600 | Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0051 to 0150
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder Account Balance, before Reserves in excess of Account Balance, End of Period	0.0		0.0
Voluntary Benefits | Unum US | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 0500 and 0600 | Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0151 and Greater
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder Account Balance, before Reserves in excess of Account Balance, End of Period	$ 0.0		$ 0.0
Minimum | Colonial Life | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 0400 and 0500
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder Account Balance, Guaranteed Minimum Credit Rating	4.00%		4.00%
Minimum | Other Insurance Product Line | Closed Block | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 0300 and 0599
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder Account Balance, Guaranteed Minimum Credit Rating	3.00%		3.00%
Minimum | Other Insurance Product Line | Closed Block | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 0600 and 0899
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder Account Balance, Guaranteed Minimum Credit Rating	6.00%		6.00%
Minimum | Other Insurance Product Line | Closed Block | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 0900 and 1199
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder Account Balance, Guaranteed Minimum Credit Rating	9.00%		9.00%
Minimum | Other Insurance Product Line | Closed Block | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 1200 and 1500
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder Account Balance, Guaranteed Minimum Credit Rating	12.00%		12.00%
Minimum | Voluntary Benefits | Unum US | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 0300 to 0399
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder Account Balance, Guaranteed Minimum Credit Rating	3.00%		3.00%
Minimum | Voluntary Benefits | Unum US | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 0400 and 0499
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder Account Balance, Guaranteed Minimum Credit Rating	4.00%		4.00%
Minimum | Voluntary Benefits | Unum US | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 0500 and 0600
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder Account Balance, Guaranteed Minimum Credit Rating	5.00%		5.00%
Maximum | Colonial Life | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 0400 and 0500
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder Account Balance, Guaranteed Minimum Credit Rating	5.00%		5.00%
Maximum | Other Insurance Product Line | Closed Block | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 0300 and 0599
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder Account Balance, Guaranteed Minimum Credit Rating	5.99%		5.99%
Maximum | Other Insurance Product Line | Closed Block | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 0600 and 0899
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder Account Balance, Guaranteed Minimum Credit Rating	8.99%		8.99%
Maximum | Other Insurance Product Line | Closed Block | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 0900 and 1199
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder Account Balance, Guaranteed Minimum Credit Rating	11.99%		11.99%
Maximum | Other Insurance Product Line | Closed Block | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 1200 and 1500
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder Account Balance, Guaranteed Minimum Credit Rating	15.00%		15.00%
Maximum | Voluntary Benefits | Unum US | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 0300 to 0399
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder Account Balance, Guaranteed Minimum Credit Rating	3.99%		3.99%
Maximum | Voluntary Benefits | Unum US | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 0400 and 0499
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder Account Balance, Guaranteed Minimum Credit Rating	4.99%		4.99%
Maximum | Voluntary Benefits | Unum US | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 0500 and 0600
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder Account Balance, Guaranteed Minimum Credit Rating	6.00%		6.00%

XML

Deferred Policy Acquisition Costs (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Movement Analysis of Deferred Policy Acquisition Costs
Deferred Acquisition Costs at Beginning of Year			$ 2,560.0
Deferred Policy Acquisition Costs, Amortization Expense	$ (129.1)	$ (102.9)	(358.7)	$ (313.0)
Deferred Acquisition Costs at End of Period	2,668.7	2,526.5	2,668.7	2,526.5
Operating Segments
Movement Analysis of Deferred Policy Acquisition Costs
Deferred Acquisition Costs at Beginning of Year			2,560.0	2,427.4
Deferred Policy Acquisition Cost			467.5	419.1
Deferred Policy Acquisition Costs, Amortization Expense			(358.7)	(313.0)
Deferred Policy Acquisition Cost, Foreign Currency Translation Adjustment and Other			(0.1)	(7.0)
Deferred Acquisition Costs at End of Period	2,668.7	2,526.5	2,668.7	2,526.5
Unum US
Movement Analysis of Deferred Policy Acquisition Costs
Deferred Acquisition Costs at Beginning of Year			1,185.1	1,152.9
Deferred Policy Acquisition Cost			230.6	199.4
Deferred Policy Acquisition Costs, Amortization Expense			(199.2)	(178.5)
Deferred Policy Acquisition Cost, Foreign Currency Translation Adjustment and Other			0.0	0.0
Deferred Acquisition Costs at End of Period	1,216.5	1,173.8	1,216.5	1,173.8
Unum US | Group Disability
Movement Analysis of Deferred Policy Acquisition Costs
Deferred Acquisition Costs at Beginning of Year			61.0	60.9
Deferred Policy Acquisition Cost			44.7	38.1
Deferred Policy Acquisition Costs, Amortization Expense			(42.1)	(38.0)
Deferred Acquisition Costs at End of Period	63.6	61.0	63.6	61.0
Unum US | Group Life and AD&D
Movement Analysis of Deferred Policy Acquisition Costs
Deferred Acquisition Costs at Beginning of Year			49.3	53.9
Deferred Policy Acquisition Cost			28.9	26.9
Deferred Policy Acquisition Costs, Amortization Expense			(29.5)	(30.5)
Deferred Acquisition Costs at End of Period	48.7	50.3	48.7	50.3
Unum US | Voluntary Benefits
Movement Analysis of Deferred Policy Acquisition Costs
Deferred Acquisition Costs at Beginning of Year			601.0	588.6
Deferred Policy Acquisition Cost			85.2	76.0
Deferred Policy Acquisition Costs, Amortization Expense			(79.5)	(66.6)
Deferred Acquisition Costs at End of Period	606.7	598.0	606.7	598.0
Unum US | Individual Disability
Movement Analysis of Deferred Policy Acquisition Costs
Deferred Acquisition Costs at Beginning of Year			464.4	441.8
Deferred Policy Acquisition Cost			62.6	50.9
Deferred Policy Acquisition Costs, Amortization Expense			(40.2)	(36.8)
Deferred Acquisition Costs at End of Period	486.8	455.9	486.8	455.9
Unum US | Dental and Vision
Movement Analysis of Deferred Policy Acquisition Costs
Deferred Acquisition Costs at Beginning of Year			9.4	7.7
Deferred Policy Acquisition Cost			9.2	7.5
Deferred Policy Acquisition Costs, Amortization Expense			(7.9)	(6.6)
Deferred Acquisition Costs at End of Period	10.7	8.6	10.7	8.6
Unum International
Movement Analysis of Deferred Policy Acquisition Costs
Deferred Acquisition Costs at Beginning of Year			37.0	36.4
Deferred Policy Acquisition Cost			10.8	9.3
Deferred Policy Acquisition Costs, Amortization Expense			(6.1)	(6.1)
Deferred Policy Acquisition Cost, Foreign Currency Translation Adjustment and Other			(0.1)	(7.0)
Deferred Acquisition Costs at End of Period	41.6	32.6	41.6	32.6
Colonial Life
Movement Analysis of Deferred Policy Acquisition Costs
Deferred Acquisition Costs at Beginning of Year			1,337.9	1,238.1
Deferred Policy Acquisition Cost			226.1	210.4
Deferred Policy Acquisition Costs, Amortization Expense			(153.4)	(128.4)
Deferred Policy Acquisition Cost, Foreign Currency Translation Adjustment and Other			0.0	0.0
Deferred Acquisition Costs at End of Period	$ 1,410.6	$ 1,320.1	$ 1,410.6	$ 1,320.1

XML

Premium Income by Major Line of Business within Each Segment (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Segment Reporting Information
Premium Income	$ 2,525.9	$ 2,388.9	$ 7,494.3	$ 7,206.3
Operating Segments
Segment Reporting Information
Premium Income	2,525.9	2,388.9	7,494.3	7,206.3
Operating Segments | Unum US
Segment Reporting Information
Premium Income	1,657.7	1,556.8	4,908.7	4,670.8
Operating Segments | Unum US | Group Long-term Disability
Segment Reporting Information
Premium Income	518.5	480.9	1,539.3	1,419.2
Operating Segments | Unum US | Group Short-term Disability
Segment Reporting Information
Premium Income	256.5	232.2	753.0	685.9
Operating Segments | Unum US | Group Life
Segment Reporting Information
Premium Income	423.0	417.7	1,254.3	1,249.9
Operating Segments | Unum US | Accidental Death & Dismemberment
Segment Reporting Information
Premium Income	44.1	43.8	131.2	129.7
Operating Segments | Unum US | Voluntary Benefits
Segment Reporting Information
Premium Income	209.5	196.2	637.4	629.2
Operating Segments | Unum US | Individual Disability
Segment Reporting Information
Premium Income	136.7	118.9	386.7	350.3
Operating Segments | Unum US | Dental and Vision
Segment Reporting Information
Premium Income	69.4	67.1	206.8	206.6
Operating Segments | Unum International
Segment Reporting Information
Premium Income	210.6	173.3	607.1	540.5
Operating Segments | Unum International | Group Long-term Disability
Segment Reporting Information
Premium Income	101.1	89.8	297.5	287.5
Operating Segments | Unum International | Group Life
Segment Reporting Information
Premium Income	44.2	35.0	124.5	100.5
Operating Segments | Unum International | Supplemental
Segment Reporting Information
Premium Income	34.6	27.4	99.9	85.8
Operating Segments | Unum International | Unum Poland
Segment Reporting Information
Premium Income	30.7	21.1	85.2	66.7
Operating Segments | Colonial Life
Segment Reporting Information
Premium Income	431.2	423.3	1,291.3	1,281.6
Operating Segments | Colonial Life | Accident, Sickness, and Disability
Segment Reporting Information
Premium Income	236.7	236.1	708.0	714.0
Operating Segments | Colonial Life | Life
Segment Reporting Information
Premium Income	106.2	100.2	318.1	303.2
Operating Segments | Colonial Life | Cancer and Critical Illness Colonial
Segment Reporting Information
Premium Income	88.3	87.0	265.2	264.4
Operating Segments | Closed Block
Segment Reporting Information
Premium Income	226.4	235.5	687.2	713.4
Operating Segments | Closed Block | Long-term Care
Segment Reporting Information
Premium Income	172.1	174.5	521.2	523.0
Operating Segments | Closed Block | Other Insurance Product Line
Segment Reporting Information
Premium Income	$ 54.3	$ 61.0	$ 166.0	$ 190.4

XML

Selected Operating Statement Data by Segment (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Segment Reporting Information
Premium Income	$ 2,525.9	$ 2,388.9	$ 7,494.3	$ 7,206.3
Net Investment Income	526.0	511.6	1,565.9	1,597.8
Other Income	71.6	63.0	210.6	197.5
Operating Segments
Segment Reporting Information
Premium Income	2,525.9	2,388.9	7,494.3	7,206.3
Net Investment Income	526.0	511.6	1,565.9	1,597.8
Other Income	71.6	63.0	210.6	197.5
Adjusted Operating Revenue	3,123.5	2,963.5	9,270.8	9,001.6
Adjusted Operating Income (Loss)	490.2	416.2	1,478.1	1,218.1
Operating Segments | Unum US
Segment Reporting Information
Premium Income	1,657.7	1,556.8	4,908.7	4,670.8
Net Investment Income	166.2	170.6	481.5	509.4
Other Income	58.0	49.0	166.1	146.8
Adjusted Operating Revenue	1,881.9	1,776.4	5,556.3	5,327.0
Adjusted Operating Income (Loss)	357.8	280.8	1,013.4	741.0
Operating Segments | Unum International
Segment Reporting Information
Premium Income	210.6	173.3	607.1	540.5
Net Investment Income	27.3	37.0	104.0	122.3
Other Income	0.5	0.2	1.0	0.7
Adjusted Operating Revenue	238.4	210.5	712.1	663.5
Adjusted Operating Income (Loss)	36.8	24.9	118.7	78.9
Operating Segments | Colonial Life
Segment Reporting Information
Premium Income	431.2	423.3	1,291.3	1,281.6
Net Investment Income	39.3	38.6	114.6	115.4
Other Income	0.3	0.3	0.9	0.8
Adjusted Operating Revenue	470.8	462.2	1,406.8	1,397.8
Adjusted Operating Income (Loss)	102.9	117.9	312.3	317.4
Operating Segments | Closed Block
Segment Reporting Information
Premium Income	226.4	235.5	687.2	713.4
Net Investment Income	274.9	251.4	796.0	817.7
Other Income	12.8	13.1	40.1	45.6
Adjusted Operating Revenue	514.1	500.0	1,523.3	1,576.7
Adjusted Operating Income (Loss)	34.2	42.1	143.6	207.6
Operating Segments | Corporate
Segment Reporting Information
Premium Income	0.0	0.0	0.0	0.0
Net Investment Income	18.3	14.0	69.8	33.0
Other Income	0.0	0.4	2.5	3.6
Adjusted Operating Revenue	18.3	14.4	72.3	36.6
Adjusted Operating Income (Loss)	$ (41.5)	$ (49.5)	$ (109.9)	$ (126.8)

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Assets by Segment (Detail) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022	Sep. 30, 2022
Segment Reporting Information
Total Assets	$ 59,954.5	$ 61,148.5	$ 60,377.9
Operating Segments | Unum US
Segment Reporting Information
Total Assets	15,088.5	16,356.3
Operating Segments | Unum International
Segment Reporting Information
Total Assets	3,165.9	3,129.4
Operating Segments | Colonial Life
Segment Reporting Information
Total Assets	4,608.6	4,575.0
Operating Segments | Closed Block
Segment Reporting Information
Total Assets	33,070.4	33,776.6
Operating Segments | Corporate
Segment Reporting Information
Total Assets	$ 4,021.1	$ 3,311.2

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Reconciliation of Total Revenue and Income Before Income Tax to Operating Revenue and Operating Income (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Segment Reporting, Revenue Reconciling Item
Total Revenue	$ 3,092.5	$ 2,959.1	$ 9,240.8	$ 8,979.3
Net Investment Loss	(31.0)	(4.4)	(30.0)	(22.3)
Operating Segments
Segment Reporting, Revenue Reconciling Item
Total Revenue	3,092.5	2,959.1	9,240.8	8,979.3
Net Investment Loss	(31.0)	(4.4)	(30.0)	(22.3)
Adjusted Operating Revenue	3,123.5	2,963.5	9,270.8	9,001.6
Income Before Income Tax	261.7	641.6	1,211.4	1,376.5
Reserve Assumption Updates	(177.2)	243.3	(177.2)	243.3
Adjusted Operating Income	490.2	416.2	1,478.1	1,218.1
Operating Segments | Closed Block Individual Disability Reinsurance Transaction
Segment Reporting, Revenue Reconciling Item
Amortization of the Cost of Reinsurance	(11.1)	(11.8)	(33.1)	(38.5)
Non-Contemporaneous Reinsurance	$ (9.2)	$ (1.7)	$ (26.4)	$ (24.1)

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Segment Information Segments - Additional Information (Detail)	9 Months Ended
	Sep. 30, 2023 Integer
Segment Reporting [Abstract]
Number of Operating Segments	3

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Employee Benefit Plans Net Periodic Benefit Cost (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Pension Plan | UNITED STATES
Defined Benefit Plans and Other Postretirement Benefit Plans
Service Cost	$ 2.3	$ 1.9	$ 6.9	$ 5.8
Interest Cost	22.0	16.8	66.0	50.4
Expected Return on Plan Assets	(23.0)	(26.5)	(69.1)	(79.5)
Amortization of Net Actuarial (Gain) Loss	3.8	4.1	11.4	12.2
Amortization of Prior Service Credit	0.0	0.0	0.0	0.0
Net Periodic Benefit Cost (Credit)	5.1	(3.7)	15.2	(11.1)
Pension Plan | UNITED KINGDOM
Defined Benefit Plans and Other Postretirement Benefit Plans
Service Cost	0.0	0.0	0.0	0.0
Interest Cost	1.9	1.2	5.7	3.8
Expected Return on Plan Assets	(2.1)	(2.6)	(6.3)	(8.3)
Amortization of Net Actuarial (Gain) Loss	0.6	0.1	1.9	0.3
Amortization of Prior Service Credit	0.0	0.0	0.0	0.0
Net Periodic Benefit Cost (Credit)	0.4	(1.3)	1.3	(4.2)
Other Postretirement Benefit Plans
Defined Benefit Plans and Other Postretirement Benefit Plans
Service Cost	0.0	0.0	0.0	0.0
Interest Cost	1.1	0.8	3.4	2.3
Expected Return on Plan Assets	(0.2)	(0.2)	(0.4)	(0.4)
Amortization of Net Actuarial (Gain) Loss	(2.6)	(0.2)	(7.9)	(0.7)
Amortization of Prior Service Credit	0.0	(0.1)	(0.1)	(0.2)
Net Periodic Benefit Cost (Credit)	$ (1.7)	$ 0.3	$ (5.0)	$ 1.0

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Basic and Diluted Earnings Per Share (Detail) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Numerator
Net Income	$ 202.0	$ 510.3	$ 953.2	$ 1,118.0
Denominator
Weighted Average Common Shares - Basic	196,083,200	200,035,300	197,289,500	201,262,300
Dilution for Assumed Exercises of Stock Options and Nonvested Stock Awards	1,048,600	1,614,900	1,005,600	1,256,700
Weighted Average Common Shares - Assuming Dilution	197,131,800	201,650,200	198,295,100	202,519,000
Net Income Per Common Share
Basic	$ 1.03	$ 2.55	$ 4.83	$ 5.55
Assuming Dilution	$ 1.02	$ 2.53	$ 4.81	$ 5.52

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Treasury Stock Transactions (Details) - USD ($) shares in Millions, $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Equity, Class of Treasury Stock [Line Items]
Cost of Shares Repurchased	[1]	$ 74.8	$ 42.6	$ 175.4	$ 137.5
Number of Treasury Shares Repurchased		1.5	1.2	3.9	4.2
Commissions Paid on Stock Repurchases				$ 0.1	$ 0.1
Share Repurchases Excise Tax		0.7	0.0	1.2	0.0
Accelerated Share Repurchase Agreement [Member]
Equity, Class of Treasury Stock [Line Items]
Cost of Shares Repurchased		$ 50.0	$ 50.0	$ 50.0	$ 50.0
Number of Treasury Shares Repurchased		1.0	1.7	1.0	1.7

[1] 1Includes a de minimis amount and $0.1 million of commissions for the three and nine months ended September 30, 2023, respectively, and a de minimis amount and $0.1 million of commissions for the three and nine months ended September 30, 2022, respectively. There was $0.7 million and $1.2 million of excise tax for the three and nine months ended September 30, 2023, respectively. There were no excise taxes during the three and nine months ended September 30, 2022.

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Stockholders' Equity and Earnings Per Common Share - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Oct. 31, 2023	Feb. 21, 2023	Dec. 01, 2022
Outstanding Restricted Stock and Stock Success Unit Grant Prices Lower Limit		$ 18.78		$ 18.78
Outstanding Restricted Stock and Stock Success Unit Grant Prices Upper Limit		$ 49.29		$ 49.29
Antidilutive Securities Excluded from Computation of Earnings Per Share				400,000	100,000
Cost of Shares Repurchased	[1]	$ 74.8	$ 42.6	$ 175.4	$ 137.5
Number of Treasury Shares Repurchased		1,500,000	1,200,000	3,900,000	4,200,000
Authorized Shares of Preferred Stock		25,000,000.0		25,000,000.0
Par Value Per Share of Preferred Stock		$ 0.10		$ 0.10
Issued Shares of Preferred Stock		0		0
Repurchase Program Authorized in December 2022
Authorized Amount of Treasury Share Repurchases Under Stock Repurchase Program								$ 200.0
Repurchase Program Authorized in February 2023
Authorized Amount of Treasury Share Repurchases Under Stock Repurchase Program							$ 250.0
Remaining Amount of Treasury Share Repurchases Authorized Under Stock Repurchase Program		$ 75.9		$ 75.9
Repurchase Program Authorized in October 2023 | Subsequent Event
Authorized Amount of Treasury Share Repurchases Under Stock Repurchase Program						$ 500.0

[1] 1Includes a de minimis amount and $0.1 million of commissions for the three and nine months ended September 30, 2023, respectively, and a de minimis amount and $0.1 million of commissions for the three and nine months ended September 30, 2022, respectively. There was $0.7 million and $1.2 million of excise tax for the three and nine months ended September 30, 2023, respectively. There were no excise taxes during the three and nine months ended September 30, 2022.

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Allowance for Expected Credit Losses on Premiums Receivable (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Jun. 30, 2023	Dec. 31, 2022	Jun. 30, 2022	Dec. 31, 2021
Credit Loss [Abstract]
Premium Receivable, Allowance for Credit Loss	$ 29.7	$ 31.4	$ 29.7	$ 31.4	$ 28.7	$ 32.5	$ 34.3	$ 34.2
Premiums Receivable, Gross	626.6	561.1	626.6	561.1	$ 660.3	$ 557.6	$ 593.4	$ 530.7
Premium Receivable, Credit Loss Expense (Reversal)	$ 1.0	$ (2.9)	$ (2.8)	$ (2.8)