10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D. C. 20549

FORM 10-Q

(Mark One)

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

For the quarterly period ended September 30, 2012

¨ 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 1-11294

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)

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)

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 and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted 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 and post such files).    Yes  x    No  ¨

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

(Check one): Large accelerated filer  x    Accelerated filer  ¨    Non-accelerated filer  ¨   Smaller reporting company  ¨

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

275,122,712 shares of the registrant's common stock were outstanding as of October 26, 2012.

TABLE OF CONTENTS

		Page
	Cautionary Statement Regarding Forward-Looking Statements	1
	PART I
1.	Financial Statements (Unaudited):
	Consolidated Balance Sheets at September 30, 2012 and December 31, 2011	2
	Consolidated Statements of Income for the three and nine months ended September 30, 2012 and 2011	4
	Consolidated Statements of Comprehensive Income for the three and nine months ended September 30, 2012 and 2011	5
	Consolidated Statements of Stockholders' Equity for the nine months ended September 30, 2012 and 2011	6
	Consolidated Statements of Cash Flows for the nine months ended September 30, 2012 and 2011	7
	Notes to Consolidated Financial Statements	8
	Report of Independent Registered Public Accounting Firm	45
2.	Management's Discussion and Analysis of Financial Condition and Results of Operations	46
3.	Quantitative and Qualitative Disclosures About Market Risk	81
4.	Controls and Procedures	81
	PART II
1.	Legal Proceedings	82
1A.	Risk Factors	82
2.	Unregistered Sales of Equity Securities and Use of Proceeds	82
6.	Exhibits	83
	Signatures	84

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," "intends," "projects," "goals," "objectives," or similar expressions in this document or in documents incorporated herein.

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:

• Unfavorable economic or business conditions, both domestic and foreign.

• Legislative, regulatory, or tax changes, both domestic and foreign, including the effect of potential legislation and increased regulation in the current political environment.

• Sustained periods of low interest rates.

• Changes in claim incidence, recovery rates, mortality rates, and 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 claims management operations, and changes in government programs.

• Fluctuation in insurance reserve liabilities.

• Investment results, including, but not limited to, realized investment losses resulting from defaults, contractual terms of derivative contracts, and impairments that differ from our assumptions and historical experience.

• The lack of appropriate investments in the market which can be acquired to match our liability cash flows and duration.

• Changes in interest rates, credit spreads, and securities prices.

• Increased competition from other insurers and financial services companies due to industry consolidation or other factors.

• Changes in demand for our products due to, among other factors, changes in societal attitudes, the rate of unemployment, and consumer confidence.

• Changes in accounting standards, practices, or policies.

• Changes in our financial strength and credit ratings.

• Rating agency actions, state insurance department market conduct examinations and other inquiries, other governmental investigations and actions, and negative media attention.

• Effectiveness in managing our operating risks and the implementation of operational improvements and strategic growth initiatives.

• Actual experience that deviates from our assumptions used in pricing, underwriting, and reserving.

• Actual persistency and/or sales growth that is higher or lower than projected.

• Effectiveness of our risk management program.

• The level and results of litigation.

• Currency exchange rates.

• Ability of our subsidiaries to pay dividends as a result of regulatory restrictions or changes in reserving or capital requirements.

• Ability and willingness of reinsurers to meet their obligations.

• Changes in assumptions related to intangible assets such as deferred acquisition costs, value of business acquired, and goodwill.

• Ability to recover our systems and information in the event of a disaster or unanticipated event and to protect our systems and information from unauthorized access and deliberate attacks.

• Events or consequences relating to political instability, terrorism, or acts of war, both domestic and foreign.

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, 2011.

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.

1

PART I

ITEM 1. FINANCIAL STATEMENTS

CONSOLIDATED BALANCE SHEETS (UNAUDITED)

Unum Group and Subsidiaries

	September 30 2012		December 31 2011
	(in millions of dollars)
			As Adjusted
Assets
Investments
Fixed Maturity Securities - at fair value (amortized cost: $37,457.3; $36,640.7)	$	44,744.7	$	42,486.7
Mortgage Loans	1,665.2		1,612.3
Policy Loans	3,117.0		3,051.4
Other Long-term Investments	650.9		639.2
Short-term Investments	1,590.2		1,423.5
Total Investments	51,768.0		49,213.1
Other Assets
Cash and Bank Deposits	53.6		116.6
Accounts and Premiums Receivable	1,704.9		1,672.2
Reinsurance Recoverable	4,824.7		4,854.6
Accrued Investment Income	696.8		681.8
Deferred Acquisition Costs	1,728.3		1,677.1
Goodwill	201.6		201.2
Property and Equipment	497.7		493.3
Other Assets	644.0		645.3
Total Assets	$	62,119.6	$	59,555.2

See notes to consolidated financial statements.

2

CONSOLIDATED BALANCE SHEETS (UNAUDITED) - Continued

Unum Group and Subsidiaries

	September 30 2012			December 31 2011
	(in millions of dollars)
				As Adjusted
Liabilities and Stockholders' Equity
Liabilities
Policy and Contract Benefits	$	1,442.8		$	1,494.0
Reserves for Future Policy and Contract Benefits	44,537.7			43,051.9
Unearned Premiums	497.2			433.2
Other Policyholders' Funds	1,629.4			1,625.9
Income Tax Payable	47.5			38.2
Deferred Income Tax	347.2			44.7
Short-term Debt	458.3			312.3
Long-term Debt	2,781.5			2,570.2
Other Liabilities	1,704.7			1,815.1
Total Liabilities	53,446.3			51,385.5
Commitments and Contingent Liabilities - Note 9
Stockholders' Equity
Common Stock, $0.10 par
Authorized: 725,000,000 shares
Issued: 359,705,527 and 358,691,567 shares	36.0			35.9
Additional Paid-in Capital	2,604.2			2,591.1
Accumulated Other Comprehensive Income (Loss)
Net Unrealized Gain on Securities Not Other-Than-Temporarily Impaired	892.2			614.8
Net Gain on Cash Flow Hedges	400.3			408.7
Foreign Currency Translation Adjustment	(78.6		)	(117.6		)
Unrecognized Pension and Postretirement Benefit Costs	(423.6		)	(444.1		)
Retained Earnings	7,173.4			6,611.0
Treasury Stock - at cost: 84,620,240 and 65,975,613 shares	(1,930.6		)	(1,530.1		)
Total Stockholders' Equity	8,673.3			8,169.7
Total Liabilities and Stockholders' Equity	$	62,119.6		$	59,555.2

See notes to consolidated financial statements.

3

CONSOLIDATED STATEMENTS OF INCOME (UNAUDITED)

Unum Group and Subsidiaries

	Three Months Ended September 30						Nine Months Ended September 30
	2012			2011			2012			2011
	(in millions of dollars, except share data)
				As Adjusted						As Adjusted
Revenue
Premium Income	$	1,929.4		$	1,881.2		$	5,778.9		$	5,625.7
Net Investment Income	619.2			629.2			1,872.2			1,885.0
Realized Investment Gain (Loss)
Other-Than-Temporary Impairment Loss on Fixed Maturity Securities	—			(1.2		)	—			(4.2		)
Other Net Realized Investment Gain (Loss)	21.3			(22.7		)	31.6			(8.1		)
Net Realized Investment Gain (Loss)	21.3			(23.9		)	31.6			(12.3		)
Other Income	58.1			59.1			174.5			174.8
Total Revenue	2,628.0			2,545.6			7,857.2			7,673.2
Benefits and Expenses
Benefits and Change in Reserves for Future Benefits	1,686.9			1,635.6			5,033.0			4,828.0
Commissions	227.7			220.5			690.8			662.7
Interest and Debt Expense	36.6			35.1			107.3			108.1
Deferral of Acquisition Costs	(111.0		)	(110.1		)	(347.6		)	(334.7		)
Amortization of Deferred Acquisition Costs	87.0			84.3			285.6			273.9
Compensation Expense	187.0			198.3			589.3			598.9
Other Expenses	193.4			193.2			572.0			585.7
Total Benefits and Expenses	2,307.6			2,256.9			6,930.4			6,722.6
Income Before Income Tax	320.4			288.7			926.8			950.6
Income Tax
Current	85.5			54.4			126.4			210.7
Deferred	4.7			32.3			139.9			86.7
Total Income Tax	90.2			86.7			266.3			297.4
Net Income	$	230.2		$	202.0		$	660.5		$	653.2
Net Income Per Common Share
Basic	$	0.83		$	0.68		$	2.33		$	2.14
Assuming Dilution	$	0.83		$	0.68		$	2.32		$	2.13

See notes to consolidated financial statements.

4

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED)

Unum Group and Subsidiaries

	Three Months Ended September 30						Nine Months Ended September 30
	2012			2011			2012			2011
	(in millions of dollars)
				As Adjusted						As Adjusted
Net Income	$	230.2		$	202.0		$	660.5		$	653.2
Other Comprehensive Income (Loss)
Change in Net Unrealized Gain on Securities Before Reclassification Adjustment:
Change in Net Unrealized Gain on Securities Not Other-Than-Temporarily Impaired (net of tax expense of $303.1; $599.6; $496.5; $754.9)	596.8			1,124.5			965.0			1,419.0
Change in Net Unrealized Gain on Securities Other-Than-Temporarily Impaired (net of tax benefit of $ - ; $ - ; $ - ; $1.1)	—			—			—			(2.1		)
Total Change in Net Unrealized Gain on Securities Before Reclassification Adjustment (net of tax expense of $303.1; $599.6; $496.5; $753.8)	596.8			1,124.5			965.0			1,416.9
Reclassification Adjustment for Net Realized Investment Gain (net of tax expense of $1.4; $3.4; $2.0; $4.6)	(2.6		)	(5.3		)	(4.0		)	(7.7		)
Change in Net Gain on Cash Flow Hedges (net of tax expense (benefit) of $(6.0); $34.7; $(5.3); $32.0)	(10.3		)	65.2			(8.4		)	60.1
Change in Adjustment to Reserves for Future Policy and Contract Benefits, Net of Reinsurance and Other (net of tax benefit of $213.5; $377.6; $344.0; $498.8)	(430.1		)	(703.3		)	(683.6		)	(931.2		)
Change in Foreign Currency Translation Adjustment	29.4			(33.8		)	39.0			(6.0		)
Change in Unrecognized Pension and Postretirement Benefit Costs (net of tax expense of $3.5; $2.8; $11.0; $6.9)	6.6			5.2			20.5			15.0
Total Other Comprehensive Income	189.8			452.5			328.5			547.1
Comprehensive Income	$	420.0		$	654.5		$	989.0		$	1,200.3

See notes to consolidated financial statements.

5

CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (UNAUDITED)

Unum Group and Subsidiaries

	Nine Months Ended September 30
	2012			2011
	(in millions of dollars)
				As Adjusted
Common Stock
Balance at Beginning of Year	$	35.9		$	36.5
Common Stock Activity	0.1			0.1
Retirement of Repurchased Common Shares	—			(0.8		)
Balance at End of Period	36.0			35.8
Additional Paid-in Capital
Balance at Beginning of Year	2,591.1			2,615.4
Common Stock Activity	13.1			20.7
Retirement of Repurchased Common Shares	—			(55.2		)
Balance at End of Period	2,604.2			2,580.9
Accumulated Other Comprehensive Income
Balance at Beginning of Year	461.8			351.4
Change During Period	328.5			547.1
Balance at End of Period	790.3			898.5
Retained Earnings
Balance at Beginning of Year	6,611.0			6,591.8
Net Income	660.5			653.2
Dividends to Stockholders (per common share: $0.34; $0.29)	(98.1		)	(90.3		)
Retirement of Repurchased Common Shares	—			(144.0		)
Balance at End of Period	7,173.4			7,010.7
Treasury Stock
Balance at Beginning of Year	(1,530.1		)	(1,110.2		)
Purchases of Treasury Stock	(400.5		)	(419.9		)
Balance at End of Period	(1,930.6		)	(1,530.1		)
Total Stockholders' Equity at End of Period	$	8,673.3		$	8,995.8

See notes to consolidated financial statements.

6

CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED)

Unum Group and Subsidiaries

	Nine Months Ended September 30
	2012			2011
	(in millions of dollars)
				As Adjusted
Cash Flows from Operating Activities
Net Income	$	660.5		$	653.2
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities
Change in Receivables	9.0			(45.8		)
Change in Deferred Acquisition Costs	(62.0		)	(60.8		)
Change in Insurance Reserves and Liabilities	333.8			321.7
Change in Income Taxes	151.9			37.9
Change in Other Accrued Liabilities	(24.4		)	12.4
Non-cash Adjustments to Net Investment Income	(160.7		)	(206.6		)
Net Realized Investment (Gain) Loss	(31.6		)	12.3
Depreciation	63.5			60.2
Other, Net	13.8			4.2
Net Cash Provided by Operating Activities	953.8			788.7
Cash Flows from Investing Activities
Proceeds from Sales of Fixed Maturity Securities	401.2			908.8
Proceeds from Maturities of Fixed Maturity Securities	1,583.6			1,235.0
Proceeds from Sales and Maturities of Other Investments	112.6			101.3
Purchase of Fixed Maturity Securities	(2,479.6		)	(2,162.2		)
Purchase of Other Investments	(219.4		)	(234.3		)
Net Sales (Purchases) of Short-term Investments	(194.6		)	86.3
Other, Net	(73.7		)	(75.9		)
Net Cash Used by Investing Activities	(869.9		)	(141.0		)
Cash Flows from Financing Activities
Net Short-term Debt Borrowings	146.0			117.3
Issuance of Long-term Debt	246.4			—
Long-term Debt Repayments	(45.6		)	(66.9		)
Issuance of Common Stock	4.2			7.6
Repurchase of Common Stock	(400.5		)	(619.9		)
Dividends Paid to Stockholders	(98.1		)	(90.3		)
Other, Net	0.7			3.2
Net Cash Used by Financing Activities	(146.9		)	(649.0		)
Effect of Foreign Exchange Rate Changes on Cash	—			(0.1		)
Net Decrease in Cash and Bank Deposits	(63.0		)	(1.4		)
Cash and Bank Deposits at Beginning of Year	116.6			53.6
Cash and Bank Deposits at End of Period	$	53.6		$	52.2

See notes to consolidated financial statements.

7

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED)

Unum Group and Subsidiaries

September 30, 2012

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, 2011.

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.

In connection with our preparation of the consolidated financial statements, we evaluated events that occurred subsequent to September 30, 2012 for recognition or disclosure in our financial statements and notes to our financial statements.

Note 2 - Accounting Developments

Accounting Updates Adopted in 2012:

Accounting Standards Codification (ASC) 220 "Comprehensive Income"

In June 2011, the Financial Accounting Standards Board (FASB) issued an update related to the financial statement presentation of comprehensive income. This update requires that non-owner changes in stockholders' equity be presented either in a single continuous statement of comprehensive income or in two separate but consecutive statements. In the two-statement approach, the first statement should present net income and its components, followed consecutively by a second statement presenting total other comprehensive income, the components of other comprehensive income, and the total of comprehensive income. In December 2011, the FASB issued an update to indefinitely defer the effective date pertaining to the presentation of reclassification adjustments and reinstated the previous requirement to present reclassification adjustments either on the face of the statement or in financial statement footnotes. We adopted these updates effective January 1, 2012. The adoption of these updates modified our financial statement presentation but had no effect on our financial position or results of operations.

ASC 350 "Intangibles - Goodwill and Other"

In September 2011, the FASB issued an update which gives companies the option to first assess qualitative factors to determine whether it is necessary to perform the two-step quantitative goodwill impairment test. An entity is not required to calculate the fair value of a reporting unit unless the entity determines, based on a qualitative assessment, that it is more likely than not that its fair value is less than its carrying amount. We adopted this update effective January 1, 2012. The adoption of this update had no effect on our financial position or results of operations.

ASC 820 "Fair Value Measurements and Disclosures"

In May 2011, the FASB issued an update to require additional disclosures regarding fair value measurements and to provide clarifying guidance on the application of existing fair value measurement requirements. Specifically, the update requires additional information on Level 1 and Level 2 transfers within the fair value hierarchy; the categorization by level of the fair value hierarchy for items that are not measured at fair value in the statement of financial position, but for which the fair value of such items is required to be disclosed; and information about the sensitivity of a fair value measurement in Level 3 of the fair value hierarchy to changes in unobservable inputs and any interrelationships between those unobservable inputs. We adopted this update effective January 1, 2012. The adoption of this update expanded our disclosures but had no effect on our financial position or results of operations.

8

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2012

Note 2 - Accounting Developments - Continued

ASC 860 "Transfers and Servicing"

In April 2011, the FASB issued an update to revise the criteria for assessing effective control for repurchase agreements and other agreements that both entitle and obligate a transferor to repurchase or redeem financial assets before their maturity. The determination of whether the transfer of a financial asset subject to a repurchase agreement is a sale is based, in part, on whether the entity maintains effective control over the financial asset. This update removes from the assessment of effective control the criterion requiring the transferor to have the ability to repurchase or redeem the financial asset on substantially the agreed terms, even in the event of default by the transferee, and the related requirement to demonstrate that the transferor possess adequate collateral to fund substantially all the cost of purchasing replacement financial assets. We adopted this update effective January 1, 2012. The adoption of this update had no effect on our financial position or results of operations.

ASC 944 "Financial Services - Insurance"

In October 2010, the FASB issued an update to address the diversity in practice regarding the interpretation of which costs relating to the acquisition of new or renewal insurance contracts qualify as deferred acquisition costs.  The amendments in the update require that only incremental direct costs associated with the successful acquisition of a new or renewal insurance contract can be capitalized. All other costs are to be expensed as incurred. We adopted this update effective January 1, 2012 and applied the amendments retrospectively, adjusting all prior periods. The cumulative effect of the adoption as of January 1, 2011, was a decrease to stockholders' equity of $459.5 million. The following table summarizes the effects on our financial statements.

9

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2012

Note 2 - Accounting Developments - Continued

	Historical						Effect			Historical						Effect
	Accounting			As			of			Accounting			As			of
	Method			Adjusted			Change			Method			Adjusted			Change
	(in millions of dollars, except share data)
	Three Months Ended September 30, 2011									Nine Months Ended September 30, 2011
Consolidated Statements of Income
Deferral of Acquisition Costs	$	(155.6	)	$	(110.1	)	$	45.5		$	(472.1	)	$	(334.7	)	$	137.4
Amortization of Deferred Acquisition Costs	125.2			84.3			(40.9		)	400.4			273.9			(126.5		)
Income Tax - Deferred	33.3			32.3			(1.0		)	90.0			86.7			(3.3		)
Net Income	205.6			202.0			(3.6		)	660.8			653.2			(7.6		)
Net Income Per Common Share
Basic	0.69			0.68			(0.01		)	2.16			2.14			(0.02		)
Assuming Dilution	0.69			0.68			(0.01		)	2.15			2.13			(0.02		)
Consolidated Statements of Comprehensive Income
Net Income	$	205.6		$	202.0		$	(3.6	)	$	660.8		$	653.2		$	(7.6	)
Change in Adjustment to Reserves for Future Policy and Contract Benefits, Net of Reinsurance and Other	(705.3		)	(703.3		)	2.0			(934.0		)	(931.2		)	2.8
Change in Foreign Currency Translation Adjustment	(34.1		)	(33.8		)	0.3			(6.0		)	(6.0		)	—
Consolidated Statement of Cash Flows
Net Income										$	660.8		$	653.2		$	(7.6	)
Change in Deferred Acquisition Costs										(71.7		)	(60.8		)	10.9
Change in Income Taxes										41.2			37.9			(3.3		)
	December 31, 2011									September 30, 2011
Consolidated Balance Sheets
Deferred Acquisition Costs	$	2,300.9		$	1,677.1		$	(623.8	)	$	2,572.4		$	1,860.6		$	(711.8	)
Deferred Income Tax	261.2			44.7			(216.5		)	795.3			547.8			(247.5		)
Net Unrealized Gain on Securities Not Other-Than-Temporarily Impaired	605.8			614.8			9.0			885.6			894.0			8.4
Foreign Currency Translation Adjustment	(121.5		)	(117.6		)	3.9			(116.9		)	(113.0		)	3.9
Retained Earnings	7,031.2			6,611.0			(420.2		)	7,487.3			7,010.7			(476.6		)

Accounting Updates Adopted in 2011:

ASC 310 “Receivables”

In January and April 2011, the FASB deferred the effective date of disclosures about troubled debt restructurings and issued updates providing additional clarification to help creditors in determining whether a creditor has granted a concession as well as whether a debtor is experiencing financial difficulties for purposes of determining whether a restructuring constitutes a troubled debt restructuring. We adopted these updates effective July 1, 2011. The adoption of these updates expanded our disclosures but had no effect on our financial position or results of operations.

10

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2012

Note 2 - Accounting Developments - Continued

Accounting Updates Outstanding:

ASC 210 "Balance Sheet - Disclosures about Offsetting Assets and Liabilities"

In December 2011, the FASB issued an update to require additional disclosures and information about financial instruments and derivative instruments that are either offset on the balance sheet or are subject to an enforceable master netting arrangement. These disclosures are intended to provide information that will enable users of financial statements to evaluate the effect or potential effect of netting arrangements on an entity's financial position, including the effect or potential effect of rights of setoff associated with certain financial instruments and derivative instruments. The amendments in this update are effective for interim and annual periods beginning on or after January 1, 2013. The adoption of this update will expand our disclosures but will have no effect on our financial position or results of operations.

Note 3 - Fair Values of Financial Instruments

Presented as follows are the carrying amounts and fair values of financial instruments. The carrying values of financial instruments such as short-term investments, cash and bank deposits, accounts and premiums receivable, accrued investment income, 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 following chart. Certain prior year amounts have been reclassified to conform to current presentation.

	September 30, 2012				December 31, 2011
	Carrying Amount		Fair Value		Carrying Amount		Fair Value
	(in millions of dollars)
Assets
Fixed Maturity Securities	$	44,744.7	$	44,744.7	$	42,486.7	$	42,486.7
Mortgage Loans	1,665.2		1,868.4		1,612.3		1,789.8
Policy Loans	3,117.0		3,199.6		3,051.4		3,124.4
Other Long-term Investments
Derivatives	108.2		108.2		137.7		137.7
Equity Securities	13.0		13.0		11.2		11.2
Miscellaneous Long-term Investments	460.3		460.3		436.4		436.4
Liabilities
Policyholders' Funds
Deferred Annuity Products	$	642.2	$	642.2	$	641.1	$	641.1
Supplementary Contracts without Life Contingencies	536.6		536.6		502.6		502.6
Long-term Debt	2,781.5		2,928.6		2,570.2		2,540.2
Other Liabilities
Derivatives	182.5		182.5		173.7		173.7
Embedded Derivative in Modified Coinsurance Arrangement	107.0		107.0		135.7		135.7
Unfunded Commitments to Investment Partnerships	112.2		112.2		160.6		160.6

The methods and assumptions used to estimate fair values of financial instruments are discussed as follows.

Fair Value Measurements for Financial Instruments Not Carried at Fair Value

Mortgage Loans: Fair values are estimated using discounted cash flow analyses and interest rates currently being offered for similar loans to borrowers with similar credit ratings and maturities. Loans with similar characteristics are aggregated for purposes of the calculations. These financial instruments are assigned a Level 2 within the fair value hierarchy.

11

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2012

Note 3 - Fair Values of Financial Instruments - Continued

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 $2,897.5 million and $2,838.3 million as of September 30, 2012 and December 31, 2011, 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. These financial instruments are assigned a Level 3 within the fair value hierarchy.

Miscellaneous Long-term Investments: Carrying amounts for tax credit partnerships equal the unamortized balance of our contractual commitments and approximate fair value. Fair values for private equity partnerships are primarily derived from valuations provided by the general partner in the partnerships' financial statements. These financial instruments are assigned a Level 3 within the fair value hierarchy.

Policyholders' Funds: Policyholders' funds are comprised primarily of deferred annuity products and supplementary contracts without life contingencies and represent customer deposits plus interest credited at contract rates. Carrying amounts approximate fair value. These financial instruments are assigned a Level 3 within the fair value hierarchy.

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.

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. Debt instruments which are valued using active trades from independent pricing services for which there was current market activity in that specific debt instrument have a fair value of $472.7 million at September 30, 2012 and are assigned a Level 1 within the fair value hierarchy. Debt instruments which are valued based on prices from pricing services that generally use observable inputs for securities or comparable securities in active markets in their valuation techniques have a fair value of $2,455.9 million at September 30, 2012 and are assigned a Level 2.

Unfunded Commitments to Investment Partnerships: Unfunded equity commitments represent legally binding amounts that we have committed to certain investment partnerships subject to the partnerships meeting specified conditions. When these conditions are met, we are obligated to invest these amounts in the partnerships. Carrying amounts approximate fair value. These financial instruments are assigned a Level 2 within the fair value hierarchy.

Fair Value Measurements for Financial Instruments Carried at Fair Value

We report fixed maturity securities, derivative financial instruments, and equity securities at fair value in our consolidated balance sheets. 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.

12

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2012

Note 3 - Fair Values of Financial Instruments - Continued

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 valuation technique 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 the quote is a binding offer. 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 2012, we have applied valuation techniques on a consistent basis to similar assets and liabilities and consistent with those techniques used at year end 2011.

We use observable and unobservable inputs in measuring the fair value of our financial instruments. Inputs that may be used include the following:

• Broker market maker prices and price levels

• Trade Reporting and Compliance Engine (TRACE) pricing

• Prices obtained from external pricing services

• Benchmark yields (Treasury and interest rate swap curves)

• Transactional data for new issuance and secondary trades

• Security cash flows and structures

• Recent issuance/supply

• Sector and issuer level spreads

• Security credit ratings/maturity/capital structure/optionality

• Corporate actions

• Underlying collateral

• Prepayment speeds/loan performance/delinquencies/weighted average life/seasoning

• Public covenants

• Comparative bond analysis

• Derivative spreads

• Relevant reports issued by analysts and rating agencies 

• Audited financial statements

13

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2012

Note 3 - Fair Values of Financial Instruments - Continued

We actively manage our investment portfolio, establish pricing policy, and review the reasonableness of sources and inputs used in developing pricing. We review all prices obtained to ensure they are consistent with a variety of observable market inputs and to verify the validity of a security's price.  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 price changes from the prior month which fall outside a predetermined corridor. 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 closest to the transaction date.

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.

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. We analyze credit default swap spreads relative to the average credit spread embedded within the London Interbank Offered Rate (LIBOR) setting syndicate in determining the effect of credit risk on our derivatives' fair values.  If net counterparty credit risk for a derivative asset is determined to be material and is not adequately reflected in the LIBOR-based fair value obtained from our pricing sources, we adjust the valuations obtained from our pricing sources. For purposes of valuing net counterparty risk, we measure the fair value of a group of financial assets and financial liabilities on the basis of the price that would be received to sell a net long position or transfer a net short position for a particular risk exposure in an orderly transaction between market participants at the measurement date under current market conditions. In regard to our own credit risk component, we adjust the valuation of derivative liabilities wherein the counterparty is exposed to our credit risk when the LIBOR-based valuation of our derivatives obtained from pricing sources does not effectively include an adequate credit component for our own credit risk.

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.

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 combining matrix pricing with vendor purchased software programs, 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.

At September 30, 2012, approximately 15.3 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 highest category of the three-level fair value hierarchy classification wherein inputs are unadjusted and represent quoted prices in active markets for identical assets or liabilities.

14

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2012

Note 3 - Fair Values of Financial Instruments - Continued

The remaining 84.7 percent of our fixed maturity securities were valued based on non-binding quotes or other observable and unobservable inputs, as discussed below.

• Approximately 68.7 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.  Level 2 assets or liabilities are those 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.

• Approximately 3.3 percent of our fixed maturity securities were valued based on one or more non-binding broker price levels, if validated by observable market data, or on TRACE prices for identical or similar assets absent current market activity. 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.

• Approximately 12.7 percent of our fixed maturity securities were valued based on prices of comparable securities, matrix pricing, market models, and/or internal models or were valued based on 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.  Level 3 is 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.

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

15

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2012

Note 3 - Fair Values of Financial Instruments - Continued

Fair value measurements by input level for financial instruments carried at fair value are as follows:

	September 30, 2012
	(in millions of dollars)
	Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
Assets
Fixed Maturity Securities
United States Government and Government Agencies and Authorities	$	539.5	$	836.9	$	—	$	1,376.4
States, Municipalities, and Political Subdivisions	44.0		1,578.5		110.1		1,732.6
Foreign Governments	20.6		1,368.3		46.1		1,435.0
Public Utilities	793.8		9,760.9		499.1		11,053.8
Mortgage/Asset-Backed Securities	—		2,415.2		8.4		2,423.6
All Other Corporate Bonds	5,425.6		20,364.2		894.6		26,684.4
Redeemable Preferred Stocks	24.3		14.6		—		38.9
Total Fixed Maturity Securities	6,847.8		36,338.6		1,558.3		44,744.7
Other Long-term Investments
Derivatives
Interest Rate Swaps and Forwards	—		101.3		—		101.3
Foreign Exchange Contracts	—		6.9		—		6.9
Total Derivatives	—		108.2		—		108.2
Equity Securities	—		8.6		4.4		13.0
Liabilities
Other Liabilities
Derivatives
Interest Rate Swaps	$	—	$	33.3	$	—	$	33.3
Foreign Exchange Contracts	—		149.2		—		149.2
Embedded Derivative in Modified Coinsurance Arrangement	—		—		107.0		107.0
Total Derivatives	—		182.5		107.0		289.5

16

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2012

Note 3 - Fair Values of Financial Instruments - Continued

	December 31, 2011
	(in millions of dollars)
	Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
Assets
Fixed Maturity Securities
United States Government and Government Agencies and Authorities	$	326.6	$	977.8	$	—	$	1,304.4
States, Municipalities, and Political Subdivisions	107.3		1,416.2		68.1		1,591.6
Foreign Governments	—		1,376.7		—		1,376.7
Public Utilities	718.0		9,576.4		338.9		10,633.3
Mortgage/Asset-Backed Securities	—		2,941.5		31.7		2,973.2
All Other Corporate Bonds	3,469.5		20,415.1		665.5		24,550.1
Redeemable Preferred Stocks	—		20.2		37.2		57.4
Total Fixed Maturity Securities	4,621.4		36,723.9		1,141.4		42,486.7
Other Long-term Investments
Derivatives
Interest Rate Swaps	—		134.2		—		134.2
Foreign Exchange Contracts	—		3.5		—		3.5
Total Derivatives	—		137.7		—		137.7
Equity Securities	—		—		11.2		11.2
Liabilities
Other Liabilities
Derivatives
Interest Rate Swaps	$	—	$	32.9	$	—	$	32.9
Foreign Exchange Contracts	—		140.8		—		140.8
Embedded Derivative in Modified Coinsurance Arrangement	—		—		135.7		135.7
Total Derivatives	—		173.7		135.7		309.4

17

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2012

Note 3 - Fair Values of Financial Instruments - Continued

Transfers of assets between Level 1 and Level 2 are as follows:

	Three Months Ended				Nine Months Ended
	September 30, 2012				September 30, 2012
	(in millions of dollars) Transfers into
	Level 1 from Level 2		Level 2 from Level 1		Level 1 from Level 2		Level 2 from Level 1
Fixed Maturity Securities
United States Government and Government Agencies and Authorities	$	426.8	$	60.5	$	205.9	$	20.5
States, Municipalities, and Political Subdivisions	43.0		62.9		41.9		74.8
Foreign Governments	21.7		—		20.7		—
Public Utilities	382.4		743.6		479.0		483.6
All Other Corporate Bonds	2,152.9		1,667.4		2,823.3		1,706.0
Total Fixed Maturity Securities	$	3,026.8	$	2,534.4	$	3,570.8	$	2,284.9
Equity Securities	$	—	$	7.4	$	—	$	—

	Three Months Ended				Nine Months Ended
	September 30, 2011				September 30, 2011
	(in millions of dollars) Transfers into
	Level 1 from Level 2		Level 2 from Level 1		Level 1 from Level 2		Level 2 from Level 1
Fixed Maturity Securities
United States Government and Government Agencies and Authorities	$	177.2	$	16.1	$	169.8	$	—
States, Municipalities, and Political Subdivisions	—		20.0		25.4		301.9
Foreign Governments	—		—		—		0.7
Public Utilities	665.7		694.8		710.5		488.6
All Other Corporate Bonds	1,798.1		2,347.2		2,334.1		1,732.3
Total Fixed Maturity Securities	$	2,641.0	$	3,078.1	$	3,239.8	$	2,523.5

Transfers between Level 1 and Level 2 occurred due to the change in availability of either a TRACE or broker market maker price. Depending on current market conditions, the availability of these Level 1 prices can vary from period to period. For fair value measurements of financial instruments that were transferred either into or out of Level 1 or 2, we reflect the transfers using the fair value at the beginning of the period.

18

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2012

Note 3 - Fair Values 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, 2012
	(in millions of dollars)
				Total Realized and Unrealized Investment Gains Included in
	Beginning of Period			Earnings			Other Comprehensive Income or Loss			Purchases		Sales			Level 3 Transfers					End of Period
															Into		Out of
Fixed Maturity Securities
States, Municipalities, and Political Subdivisions	$	—		$	—		$	2.0		$	—	$	—		$	108.1	$	—		$	110.1
Foreign Governments	—			—			1.3			—		—			44.8		—			46.1
Public Utilities	162.8			—			8.4			—		(1.7		)	340.5		(10.9		)	499.1
Mortgage/Asset-Backed Securities	0.6			—			0.4			—		—			7.4		—			8.4
All Other Corporate Bonds	639.6			—			19.8			—		(5.3		)	386.7		(146.2		)	894.6
Redeemable Preferred Stocks	22.2			—			—			—		—			—		(22.2		)	—
Total Fixed Maturity Securities	825.2			—			31.9			—		(7.0		)	887.5		(179.3		)	1,558.3
Equity Securities	4.4			—			—			—		—			—		—			4.4
Embedded Derivative in Modified Coinsurance Arrangement	(126.7		)	19.7			—			—		—			—		—			(107.0		)
	Three Months Ended September 30, 2011
	(in millions of dollars)
				Total Realized and Unrealized Investment Gains (Losses) Included in
	Beginning of Period			Earnings			Other Comprehensive Income or Loss			Purchases		Sales			Level 3 Transfers					End of Period
															Into		Out of
Fixed Maturity Securities
Public Utilities	$	217.9		$	0.1		$	9.3		$	30.0	$	(11.9	)	$	220.2	$	(69.8	)	$	395.8
Mortgage/Asset-Backed Securities	19.7			—			(0.1		)	—		—			—		—			19.6
All Other Corporate Bonds	528.3			—			1.3			—		(17.6		)	119.6		(164.8		)	466.8
Redeemable Preferred Stocks	22.6			—			(0.9		)	—		—			—		—			21.7
Total Fixed Maturity Securities	788.5			0.1			9.6			30.0		(29.5		)	339.8		(234.6		)	903.9
Equity Securities	3.6			(0.4		)	(2.4		)	—		—			9.6		—			10.4
Embedded Derivative in Modified Coinsurance Arrangement	(87.0		)	(33.7		)	—			—		—			—		—			(120.7		)

19

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2012

Note 3 - Fair Values of Financial Instruments - Continued

	Nine Months Ended September 30, 2012
	(in millions of dollars)
				Total Realized and Unrealized Investment Gains (Losses) Included in
	Beginning of Year			Earnings			Other Comprehensive Income or Loss			Purchases		Sales			Level 3 Transfers					End of Period
															Into		Out of
Fixed Maturity Securities
States, Municipalities, and Political Subdivisions	$	68.1		$	—		$	(0.9	)	$	—	$	(0.3	)	$	43.2	$	—		$	110.1
Foreign Governments	—			—			5.2			—		—			40.9		—			46.1
Public Utilities	338.9			—			5.4			3.6		(3.7		)	361.7		(206.8		)	499.1
Mortgage/Asset-Backed Securities	31.7			—			0.9			7.0		(0.1		)	—		(31.1		)	8.4
All Other Corporate Bonds	665.5			—			34.0			30.2		(49.0		)	448.0		(234.1		)	894.6
Redeemable Preferred Stocks	37.2			(1.0		)	0.8			—		(14.3		)	—		(22.7		)	—
Total Fixed Maturity Securities	1,141.4			(1.0		)	45.4			40.8		(67.4		)	893.8		(494.7		)	1,558.3
Equity Securities	11.2			—			—			—		(0.1		)	—		(6.7		)	4.4
Embedded Derivative in Modified Coinsurance Arrangement	(135.7		)	28.7			—			—		—			—		—			(107.0		)
	Nine Months Ended September 30, 2011
	(in millions of dollars)
				Total Realized and Unrealized Investment Gains (Losses) Included in
	Beginning of Year			Earnings			Other Comprehensive Income or Loss			Purchases		Sales			Level 3 Transfers					End of Period
															Into		Out of
Fixed Maturity Securities
Public Utilities	$	173.6		$	0.1		$	17.1		$	30.0	$	(15.7	)	$	299.7	$	(109.0	)	$	395.8
Mortgage/Asset-Backed Securities	0.7			—			(0.4		)	19.4		(0.1		)	—		—			19.6
All Other Corporate Bonds	829.7			(2.1		)	4.7			41.7		(32.5		)	96.2		(470.9		)	466.8
Redeemable Preferred Stocks	21.7			—			—			—		—			—		—			21.7
Total Fixed Maturity Securities	1,025.7			(2.0		)	21.4			91.1		(48.3		)	395.9		(579.9		)	903.9
Equity Securities	1.5			(0.4		)	(1.7		)	2.0		—			9.0		—			10.4
Embedded Derivative in Modified Coinsurance Arrangement	(96.3		)	(24.4		)	—			—		—			—		—			(120.7		)

20

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2012

Note 3 - Fair Values of Financial Instruments - Continued

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. Gains (losses) which are included in earnings and are attributable to the change in unrealized gains or losses relating to assets or liabilities valued using significant unobservable inputs and still held at period end were $19.7 million and $28.7 million, respectively, for the three and nine months ended September 30, 2012 and $(33.7) million and $(24.4) million, respectively, for the three and nine months ended September 30, 2011. These amounts relate entirely to the changes in fair value of an embedded derivative in a modified coinsurance arrangement which are reported as realized investment gains and losses.

Quantitative information regarding the significant unobservable inputs used in Level 3 fair value measurements, all of which are internally derived, is as follows:

	September 30, 2012
	(in millions of dollars)
	Fair Value			Unobservable Input		Range/Weighted Average
Fixed Maturity Securities
Public Utilities	$	17.4		- Comparability Adjustment	(b)	0.20% - 0.20%/0.20%
Mortgage/Asset-Backed Securities - Private	0.5			- Discount for Size	(c)	5.77% - 5.86%/5.84%
All Other Corporate Bonds - Private	485.1			- Change in Benchmark Reference - Comparability Adjustment - Discount for Size - Lack of Marketability - Volatility of Credit - Market Convention	(a) (b) (c) (d) (e) (f)	(0.05)% - 2.60%/0.15% (0.50)% - (0.50)%/(0.50)% 0.50% - 0.50%/0.50% 0.01% - 1.00%/0.22% (0.50)% - 6.92%/1.37% Priced at Par
All Other Corporate Bonds - Public	115.9			- Comparability Adjustment - Discount for Size - Lack of Marketability - Volatility of Credit - Market Convention	(b) (c) (d) (e) (f)	(1.24)% - 0.50%/(0.16)% 0.00% - 0.10%/0.04% 0.01% - 0.40%/0.19% 0.01% - 0.01%/0.01% Priced at Par
Equity Securities - Private	4.1			- Market Convention	(f)	Priced at Cost or Owner's Equity
Embedded Derivative in Modified Coinsurance Arrangement	(107.0		)	- Projected Liability Cash Flows	(g)	Actuarial Assumptions

(a) Represents basis point adjustments for changes in benchmark spreads associated with various ratings categories

(b) Represents basis point adjustments for changes in benchmark spreads associated with various industry sectors

(c) Represents basis point adjustments based on issue/issuer size relative to the benchmark

(d) Represents basis point adjustments to apply a discount due to the illiquidity of an investment

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

(f) Represents a decision to price based on par value, cost, or owner's equity when limited data is available

(g) Represents various actuarial assumptions required to derive the liability cash flows including incidence, termination, and lapse rates

Isolated increases in unobservable inputs other than market convention will result in a lower fair value measurement, whereas isolated decreases will result in a higher fair value measurement. 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.

21

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2012

Note 4 - Investments

Fixed Maturity Securities

At September 30, 2012 and December 31, 2011, 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, 2012
	(in millions of dollars)
	Amortized Cost		Gross Unrealized Gain		Gross Unrealized Loss		Fair Value
United States Government and Government Agencies and Authorities	$	1,031.5	$	345.8	$	0.9	$	1,376.4
States, Municipalities, and Political Subdivisions	1,423.7		316.0		7.1		1,732.6
Foreign Governments	1,209.6		225.4		—		1,435.0
Public Utilities	9,172.9		1,903.2		22.3		11,053.8
Mortgage/Asset-Backed Securities	2,105.3		318.8		0.5		2,423.6
All Other Corporate Bonds	22,481.3		4,263.3		60.2		26,684.4
Redeemable Preferred Stocks	33.0		5.9		—		38.9
Total Fixed Maturity Securities	$	37,457.3	$	7,378.4	$	91.0	$	44,744.7

	December 31, 2011
	(in millions of dollars)
	Amortized Cost		Gross Unrealized Gain		Gross Unrealized Loss		Fair Value
United States Government and Government Agencies and Authorities	$	1,005.8	$	299.7	$	1.1	$	1,304.4
States, Municipalities, and Political Subdivisions	1,377.8		222.6		8.8		1,591.6
Foreign Governments	1,139.4		237.3		—		1,376.7
Public Utilities	9,015.7		1,646.2		28.6		10,633.3
Mortgage/Asset-Backed Securities	2,634.6		344.1		5.5		2,973.2
All Other Corporate Bonds	21,411.6		3,314.8		176.3		24,550.1
Redeemable Preferred Stocks	55.8		3.5		1.9		57.4
Total Fixed Maturity Securities	$	36,640.7	$	6,068.2	$	222.2	$	42,486.7

As of September 30, 2012 and December 31, 2011, we held no fixed maturity securities for which a portion of an other-than-temporary impairment had previously been recognized in other comprehensive income.

22

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2012

Note 4 - Investments - Continued

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

	September 30, 2012
	(in millions of dollars)
	Less Than 12 Months				12 Months or Greater
	Fair Value		Gross Unrealized Loss		Fair Value		Gross Unrealized Loss
United States Government and Government Agencies and Authorities	$	—	$	—	$	6.6	$	0.9
States, Municipalities, and Political Subdivisions	1.6		—		42.3		7.1
Public Utilities	109.3		7.5		160.2		14.8
Mortgage/Asset-Backed Securities	—		—		8.3		0.5
All Other Corporate Bonds	292.3		11.8		571.4		48.4
Total Fixed Maturity Securities	$	403.2	$	19.3	$	788.8	$	71.7

	December 31, 2011
	(in millions of dollars)
	Less Than 12 Months				12 Months or Greater
	Fair Value		Gross Unrealized Loss		Fair Value		Gross Unrealized Loss
United States Government and Government Agencies and Authorities	$	—	$	—	$	6.3	$	1.1
States, Municipalities, and Political Subdivisions	51.6		1.3		75.3		7.5
Public Utilities	192.0		7.9		142.2		20.7
Mortgage/Asset-Backed Securities	94.2		4.8		19.6		0.7
All Other Corporate Bonds	1,703.9		65.5		684.9		110.8
Redeemable Preferred Stocks	—		—		20.9		1.9
Total Fixed Maturity Securities	$	2,041.7	$	79.5	$	949.2	$	142.7

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, 2012
	(in millions of dollars)
	Total Amortized Cost		Unrealized Gain Position				Unrealized Loss Position
			Gross Gain		Fair Value		Gross Loss		Fair Value
1 year or less	$	990.2	$	23.4	$	988.7	$	0.1	$	24.8
Over 1 year through 5 years	5,613.8		590.6		6,014.8		7.6		182.0
Over 5 years through 10 years	9,776.2		1,623.1		11,051.4		17.0		330.9
Over 10 years	18,971.8		4,822.5		23,082.5		65.8		646.0
	35,352.0		7,059.6		41,137.4		90.5		1,183.7
Mortgage/Asset-Backed Securities	2,105.3		318.8		2,415.3		0.5		8.3
Total Fixed Maturity Securities	$	37,457.3	$	7,378.4	$	43,552.7	$	91.0	$	1,192.0

23

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2012

Note 4 - Investments - Continued

	December 31, 2011
	(in millions of dollars)
	Total Amortized Cost		Unrealized Gain Position				Unrealized Loss Position
			Gross Gain		Fair Value		Gross Loss		Fair Value
1 year or less	$	715.1	$	16.0	$	701.4	$	0.1	$	29.6
Over 1 year through 5 years	5,161.5		449.8		4,949.0		20.7		641.6
Over 5 years through 10 years	9,630.5		1,266.3		9,903.8		52.8		940.2
Over 10 years	18,499.0		3,992.0		21,082.2		143.1		1,265.7
	34,006.1		5,724.1		36,636.4		216.7		2,877.1
Mortgage/Asset-Backed Securities	2,634.6		344.1		2,859.4		5.5		113.8
Total Fixed Maturity Securities	$	36,640.7	$	6,068.2	$	39,495.8	$	222.2	$	2,990.9

At September 30, 2012, the fair value of investment-grade fixed maturity securities was $41,593.8 million, with a gross unrealized gain of $7,193.5 million and a gross unrealized loss of $38.0 million. The gross unrealized loss on investment-grade fixed maturity securities was 41.8 percent of the total gross unrealized loss on fixed maturity securities. 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.

At September 30, 2012, the fair value of below-investment-grade fixed maturity securities was $3,150.9 million, with a gross unrealized gain of $184.9 million and a gross unrealized loss of $53.0 million. The gross unrealized loss on below-investment-grade fixed maturity securities was 58.2 percent of the total gross unrealized loss on fixed maturity securities. Generally, below-investment-grade fixed maturity securities are more likely to develop credit concerns than investment-grade securities. At September 30, 2012, 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 an other-than-temporary impairment will recover in value.

As of September 30, 2012, we held 36 individual investment-grade fixed maturity securities and 35 individual below-investment-grade fixed maturity securities that were in an unrealized loss position, of which 22 investment-grade fixed maturity securities and 20 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 is other than temporary, 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

• The time period during which there has been a significant 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

24

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2012

Note 4 - Investments - Continued

We evaluate available information, including the factors noted above, both positive and negative, in reaching our conclusions. In particular, we also consider the strength of the issuer's balance sheet, its debt obligations and near term funding requirements, 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. Although available and applicable factors are considered in our analysis, our expectation of recovering the entire amortized cost basis of the security, whether we intend to sell the security, whether it is more likely than not we will be required to sell the security before recovery of its amortized cost, and whether the security is current on principal and interest payments are the most critical factors in determining whether impairments are other than temporary. The significance of the decline in value and the length of time during which there has been a significant decline are also important factors, but we generally do not record an impairment loss based solely on these two factors, since often other more relevant factors will impact our evaluation of a security.

While determining other-than-temporary impairments 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 problem investments and the recording of losses on a timely basis for investments determined to have an other-than-temporary impairment.

If we determine that the decline in value of an investment is other than temporary, the investment is written down to fair value, and an impairment loss is recognized in the current period, either in earnings or in both earnings and other comprehensive income, as applicable. For those fixed maturity securities with an unrealized loss for which we have not recognized an other-than-temporary impairment, we believe we will recover the entire amortized cost, we do not intend to sell the security, and we do not believe it is more likely than not we will be required to sell the security before recovery of its amortized cost. There have been no defaults in the repayment obligations of any securities for which we have not recorded an other-than-temporary impairment.

Other-than-temporary impairment losses on fixed maturity securities which we intend to sell or more likely than not will be required to sell before recovery in value are recognized in earnings and equal the entire difference between the security's amortized cost basis and its fair value. For securities which we do not intend to sell and it is not more likely than not that we will be required to sell before recovery in value, other-than-temporary impairment losses recognized in earnings generally represent the difference between the amortized cost of the security and 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.  The determination of cash flows is inherently subjective, and methodologies may vary depending on the circumstances specific to the security. The timing and amount of our cash flow estimates are developed using historical and forecast financial information from the issuer, including its current and projected liquidity position. We also consider industry analyst reports and forecasts, sector credit ratings, future business prospects and earnings trends, issuer refinancing capabilities, actual and/or potential asset sales by the issuer, and other data relevant to the collectibility of the contractual cash flows of the security. We take into account the probability of default, expected recoveries, third party guarantees, quality of collateral, and where our debt security ranks in terms of subordination. We may use the estimated fair value of collateral as a proxy for the present value of cash flows if we believe the security is dependent on the liquidation of collateral for recovery of our investment.  For fixed maturity securities for which we have recognized an other-than-temporary impairment loss through earnings, if through subsequent evaluation there is a significant increase in expected cash flows, the difference between the new amortized cost basis and the cash flows expected to be collected is accreted as net investment income.

25

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2012

Note 4 - Investments - Continued

The following table presents the before-tax credit related portion of other-than-temporary impairments on fixed maturity securities still held for which a portion of an other-than-temporary impairment was recognized in other comprehensive income. The fixed maturity security to which the impairment pertained was sold during the three months ended March 31, 2011. We held no fixed maturity securities during the three months ended September 30, 2011, as of the beginning of 2012, or during the nine months ended September 30, 2012 for which a portion of an other-than-temporary impairment was previously recognized in other comprehensive income.

	Nine Months Ended
	September 30, 2011
	(in millions of dollars)
Balance at Beginning of Year	$	8.5
Sales or Maturities of Securities	(8.5		)
Balance at End of Period	$	—

At September 30, 2012, we had non-binding commitments of $125.0 million to fund private placement fixed maturity securities. 

Variable Interest Entities

We invest in variable interests issued by variable interest entities. These investments include tax credit partnerships, private equity 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, 2012, the carrying amount of our variable interest entity investments that are not consolidated under the provisions of GAAP was $452.1 million, comprised of $337.4 million of tax credit partnerships and $114.7 million of private equity partnerships. These variable interest entity investments are reported as other long-term investments in our consolidated balance sheets.

Additionally, we recognize a liability for all legally binding unfunded commitments to these partnerships, with a corresponding recognition of an invested asset.  Our liability for legally binding unfunded commitments to the tax credit partnerships was $112.2 million at September 30, 2012. Contractually, we are a limited partner in these investments, and our maximum exposure to loss is limited to the carrying value of our investment. We had non-binding commitments of $73.1 million to fund certain private equity partnerships at September 30, 2012, the amount of which may or may not be funded.

We are the sole beneficiary of a special purpose entity which is consolidated under the provisions of GAAP.  This entity is a securitized asset trust containing a highly rated bond for principal protection, nonredeemable preferred stock, and several partnership equity investments.  We contributed the bond and partnership investments into the trust at the time it was established.  The trust supports our investment objectives and allows us to maintain our investment in the partnerships while at the same time protecting the principal of the investment.  There are no restrictions on the assets held in this trust, and the trust is free to dispose of the assets at any time.  Because the assets in the trust are not liquid investments, we periodically provide funding to the underlying partnerships in the trust upon satisfaction of contractual notice from the partnerships.  The fair values of the bond, nonredeemable preferred stock, and partnerships were $140.2 million, $0.1 million, and $8.2 million, respectively, as of September 30, 2012.  The bonds are reported as fixed maturity securities, and the nonredeemable preferred stock and partnerships are reported as other long-term investments in our consolidated balance sheets. At September 30, 2012, we had no commitments to fund the underlying partnerships, nor did we fund any amounts to the partnerships during the three and nine months ended September 30, 2012 and 2011.

26

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2012

Note 4 - Investments - Continued

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 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.

Mortgage loans by property type and geographic region are as follows:

	September 30, 2012				December 31, 2011
	Carrying		Percent of		Carrying		Percent of
	Amount		Total		Amount		Total
	(in millions of dollars)
Property Type
Apartment	$	34.3	2.1	%	$	28.0	1.8	%
Industrial	528.4		31.7		502.0		31.1
Mixed	78.9		4.7		93.5		5.8
Office	677.1		40.7		659.3		40.9
Retail	346.5		20.8		322.4		20.0
Other	—		—		7.1		0.4
Total	$	1,665.2	100.0	%	$	1,612.3	100.0	%

Region
New England	$	132.4	8.0	%	$	147.0	9.1	%
Mid-Atlantic	161.2		9.7		174.1		10.8
East North Central	212.1		12.7		212.7		13.2
West North Central	147.3		8.8		151.2		9.4
South Atlantic	418.6		25.2		383.8		23.8
East South Central	80.1		4.8		52.4		3.3
West South Central	173.1		10.4		160.4		9.9
Mountain	81.9		4.9		69.5		4.3
Pacific	258.5		15.5		261.2		16.2
Total	$	1,665.2	100.0	%	$	1,612.3	100.0	%

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

• Loan-to-value ratio

• 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

27

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2012

Note 4 - Investments - Continued

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 credit quality ratings on an annual basis. This review process is performed more frequently for mortgage loans deemed to have a higher risk of delinquency.

Mortgage loans, sorted by the applicable credit quality indicators, are as follows:

	September 30		December 31
	2012		2011
	(in millions of dollars)
Internal Rating
Aa	$	11.7	$	10.9
A	655.8		712.6
Baa	951.0		855.0
Ba	29.4		20.7
B	17.3		13.1
Total	$	1,665.2	$	1,612.3

Loan-to-Value Ratio
<= 65%	$	648.6	$	578.4
> 65% <= 75%	781.9		802.3
> 75% <= 85%	186.8		165.1
> 85% <= 100%	47.9		66.5
Total	$	1,665.2	$	1,612.3

Based on an analysis of the above risk factors, as well as other current information, if we determine that it is probable we will be unable to collect all amounts due under the contractual terms of the mortgage loan, we establish an allowance for credit loss. If we expect to foreclose on the property, the amount of the allowance typically equals the excess carrying value of the mortgage loan over the fair value of the underlying collateral. If we expect to retain the mortgage loan until payoff, the allowance equals the excess carrying value of the mortgage loan over the expected future cash flows of the loan. The projection of future cash flows or a determination that the borrower can make the contractual payments is inherently subjective, and methodologies may vary depending on the circumstances specific to the loan. Additions and reductions to our allowance for credit losses on mortgage loans are reported as a component of net realized investment gains and losses. There have been no changes to our accounting policies or methodology from the prior period regarding estimating the allowance for credit losses on our mortgage loans.

The activity in the allowance for credit losses is as follows:

	Three Months Ended September 30				Nine Months Ended September 30
	2012		2011		2012			2011
	(in millions of dollars)
Balance at Beginning of Period	$	1.5	$	1.5	$	1.5		$	1.5
Provision	1.3		—		1.8			—
Charge-offs, Net of Recoveries	—		—		(0.5		)	—
Balance at End of Period	$	2.8	$	1.5	$	2.8		$	1.5

28

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2012

Note 4 - Investments - Continued

Impaired mortgage loans are as follows:

	September 30, 2012
	(in millions of dollars)
			Unpaid
	Recorded		Principal		Related
	Investment		Balance		Allowance
With No Related Allowance Recorded	$	4.3	$	4.3	$	—
With an Allowance Recorded	17.3		20.1		2.8
Total	$	21.6	$	24.4	$	2.8
	December 31, 2011
	(in millions of dollars)
			Unpaid
	Recorded		Principal		Related
	Investment		Balance		Allowance
With No Related Allowance Recorded	$	9.4	$	9.4	$	—
With an Allowance Recorded	13.1		14.6		1.5
Total	$	22.5	$	24.0	$	1.5

Our average investment in impaired mortgage loans was $15.9 million and $18.8 million, respectively, for the three and nine months ended September 30, 2012 and $26.4 million and $20.9 million, respectively, for the three and nine months ended September 30, 2011. Interest income recognized on mortgage loans subsequent to impairment was $0.2 million and $0.6 million, respectively, for each of the three and nine month periods ended September 30, 2012 and 2011.

We had no troubled debt restructurings during the three months ended September 30, 2012 and 2011. Our troubled debt restructurings during the nine months ended September 30, 2012 and 2011 were comprised entirely of loan foreclosures. A summary of our troubled debt restructurings is as follows:

	Nine Months Ended September 30
	2012		2011
	(in millions of dollars)
Carrying Amount	$	13.1	$	9.8
Number of Loans	2		1

We had no realized losses on loan foreclosures during the nine months ended September 30, 2012 and 2011 other than the initial impairment losses realized prior to foreclosure.

For mortgage loans that are past due regarding principal and/or interest payments and for which collection of investment income is uncertain, we discontinue the accrual of investment income. At September 30, 2012, we held one mortgage loan for which we had discontinued the accrual of investment income that was greater than 60 days past due and had a carrying value of $4.2 million. At December 31, 2011, we held one such mortgage loan that was greater than 90 days past due and had a carrying value of $9.4 million.

At September 30, 2012, we had non-binding commitments of $117.1 million to fund certain commercial mortgage loans, the amount of which may or may not be funded.

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.

29

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2012

Note 4 - Investments - Continued

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. Generally, cash is received as collateral under these agreements and is typically reinvested in short-term investments. In the event that securities are received as collateral, we are not permitted to sell or re-post them.

We account for all of our securities lending agreements and repurchase agreements as collateralized financings. As of September 30, 2012, the carrying amount of fixed maturity securities loaned to third parties under our securities lending program was $457.3 million, for which we received collateral in the form of cash and securities of $458.3 million and $15.7 million, respectively. As of December 31, 2011, the carrying amount of fixed maturity securities loaned to third parties under our securities lending program was $319.1 million, for which we received collateral in the form of cash and securities of $312.3 million and $16.7 million, respectively. We had no outstanding repurchase agreements at September 30, 2012 or December 31, 2011.

Realized Investment Gain and Loss

Realized investment gains and losses reported in our consolidated statements of income are as follows:

	Three Months Ended September 30						Nine Months Ended September 30
	2012			2011			2012			2011
	(in millions of dollars)
Fixed Maturity Securities
Gross Gains on Sales	$	4.6		$	14.8		$	14.0		$	33.0
Gross Losses on Sales	(2.3		)	(5.4		)	(9.0		)	(22.1		)
Other-Than-Temporary Impairment Loss	—			(1.2		)	—			(4.2		)
Mortgage Loans and Other Invested Assets
Gross Gains on Sales	2.3			1.6			2.3			7.1
Gross Losses on Sales	—			—			—			(0.2		)
Impairment Loss	(1.3		)	(0.4		)	(1.8		)	(0.4		)
Embedded Derivative in Modified Coinsurance Arrangement	19.7			(33.7		)	28.7			(24.4		)
Foreign Currency Transactions	(1.7		)	0.4			(2.6		)	(1.1		)
Net Realized Investment Gain (Loss)	$	21.3		$	(23.9	)	$	31.6		$	(12.3	)

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, and foreign currency risk. Historically, we have utilized current and forward interest rate swaps and options on forward interest rate swaps, current and forward currency swaps, forward treasury locks, currency forward contracts, and forward contracts on specific fixed income securities. Hedging transactions 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.

Our cash flow hedging programs are as follows:

• Interest rate swaps are 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. The purpose of these swaps is 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 use interest rate swaps to hedge the potential adverse impact of rising interest rates in anticipation of issuing fixed rate long-term debt.

30

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2012

Note 5 - Derivative Financial Instruments - Continued

• Foreign currency interest rate swaps have historically been used to hedge the currency risk of certain foreign currency-denominated fixed maturity securities owned for portfolio diversification and to hedge the currency risk associated with certain of the interest payments and debt repayments of the U.S. dollar-denominated debt issued by one of our U.K. subsidiaries. For hedges of fixed maturity securities, 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. For hedges of debt issued, we agree to pay, at specified intervals, fixed rate foreign currency-denominated principal and interest payments to the counterparty in exchange for fixed rate U.S. dollar-denominated interest payments.

• Forward treasury locks are used to minimize interest rate risk associated with the anticipated purchase or disposal of fixed maturity securities. A forward treasury lock is a derivative contract without an initial investment where we and the counterparty agree to purchase or sell a specific U.S. Treasury bond at a future date at a pre-determined price.

• Foreign currency forward contracts are used to minimize foreign currency risks. 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 have used these forward contracts to hedge the foreign currency risk associated with certain of the debt repayments of the U.S. dollar-denominated debt issued by one of our U.K. subsidiaries and to hedge the currency risk of certain foreign currency-denominated fixed maturity securities owned for diversification purposes.

Our fair value hedging programs are as follows:

• Interest rate swaps are used to effectively convert certain of our fixed rate securities into floating rate securities which are used to fund our floating rate long-term debt. Under these swap agreements, we receive a variable rate of interest and pay a fixed rate of interest. Additionally, we use interest rate swaps to effectively convert certain fixed rate long-term debt into floating rate long-term debt. Under these swap agreements, we receive a fixed rate of interest and pay a variable rate of interest.

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. Our current credit exposure on derivatives, which is limited to the value of those contracts in a net gain position less collateral held, was $9.8 million at September 30, 2012. We held cash collateral of $15.3 million and $45.6 million from our counterparties as of September 30, 2012 and December 31, 2011, respectively. This unrestricted cash collateral is included in short-term investments, and the associated obligation to return the collateral to our counterparties is included in other liabilities in our consolidated balance sheets. We post either fixed maturity securities or cash as collateral to our counterparties. The carrying value of fixed maturity securities posted as collateral to our counterparties was $129.4 million and $114.9 million at September 30, 2012 and December 31, 2011, respectively. We had no cash posted as collateral to our counterparties at September 30, 2012 and December 31, 2011.

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 $182.5 million and $173.7 million at September 30, 2012 and December 31, 2011, respectively.

31

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2012

Note 5 - Derivative Financial Instruments - Continued

Hedging Activity

The table below summarizes, by notional amounts, the activity for each category of derivatives.

	Swaps
	Receive Variable/Pay Fixed		Receive Fixed/Pay Fixed		Receive Fixed/Pay Variable		Forwards		Total
			(in millions of dollars)
Balance at June 30, 2011	$	174.0	$	579.7	$	785.0	$	—	$	1,538.7
Additions	—		—		—		15.0		15.0
Terminations	—		5.0		50.0		—		55.0
Balance at September 30, 2011	$	174.0	$	574.7	$	735.0	$	15.0	$	1,498.7
Balance at December 31, 2010	$	174.0	$	617.9	$	890.0	$	—	$	1,681.9
Additions	—		—		—		46.9		46.9
Terminations	—		43.2		155.0		31.9		230.1
Balance at September 30, 2011	$	174.0	$	574.7	$	735.0	$	15.0	$	1,498.7
Balance at June 30, 2012	$	174.0	$	540.5	$	595.0	$	—	$	1,309.5
Additions	—		—		250.0		25.0		275.0
Terminations	—		26.3		45.0		—		71.3
Balance at September 30, 2012	$	174.0	$	514.2	$	800.0	$	25.0	$	1,513.2
Balance at December 31, 2011	$	174.0	$	554.0	$	685.0	$	—	$	1,413.0
Additions	—		—		250.0		81.0		331.0
Terminations	—		39.8		135.0		56.0		230.8
Balance at September 30, 2012	$	174.0	$	514.2	$	800.0	$	25.0	$	1,513.2

The following table summarizes the timing of anticipated settlements of interest rate swaps outstanding under our cash flow hedging programs at September 30, 2012, whereby we receive a fixed rate and pay a variable rate. The weighted average variable interest rates assume current market conditions.

	2012			2013			Total
	(in millions of dollars)
Notional Value	$	50.0		$	150.0		$	200.0
Weighted Average Receive Rate	6.50		%	6.34		%	6.38		%
Weighted Average Pay Rate	0.36		%	0.36		%	0.36		%

Cash Flow Hedges

As of September 30, 2012 and December 31, 2011, we had $200.0 million and $335.0 million, respectively, notional amount of forward starting interest rate swaps to hedge the anticipated purchase of fixed maturity securities and $514.2 million and $554.0 million, respectively, notional amount of open current and forward foreign currency swaps to hedge fixed income foreign currency-denominated securities.

As of September 30, 2012, we had $25.0 million notional amount of open forward treasury locks to hedge the interest rate risk associated with the anticipated proceeds to be received from the call of specific fixed maturity securities. We had no open forward treasury locks at December 31, 2011.

For the three and nine months ended September 30, 2012 and 2011, there was no material ineffectiveness related to our cash flow hedges, and no component of the derivative instruments' gain or loss was excluded from the assessment of hedge effectiveness.

32

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2012

Note 5 - Derivative Financial Instruments - Continued

As of September 30, 2012, we expect to amortize approximately $39.8 million of net deferred gains on derivative instruments during the next twelve months. This amount will be reclassified from accumulated other comprehensive income 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. The estimated amortization includes the impact of certain derivative contracts that have not yet been terminated as of September 30, 2012. Fluctuations in fair values of these derivatives between September 30, 2012 and the date of termination will vary our projected amortization. Amounts that will be reclassified from accumulated other comprehensive income into earnings to offset the earnings impact of foreign currency translation of hedged items are not estimable.

As of September 30, 2012, we are hedging the variability of future cash flows associated with forecasted transactions through the year 2038.

Fair Value Hedges

As of September 30, 2012 and December 31, 2011, we had $174.0 million notional amount of receive variable, pay fixed interest rate swaps to hedge the changes in fair value of certain fixed rate securities held. These swaps effectively convert the associated fixed rate securities into floating rate securities, which are used to fund our floating rate long-term debt. Changes in the fair value of the derivative and changes in the fair value of the hedged item attributable to the risk being hedged are recognized in current earnings as a component of net realized investment gain or loss during the period of change in fair value.  The change in fair value of the hedged fixed maturity securities attributable to the hedged benchmark interest rate resulted in gains of $0.2 million and $0.4 million for the three and nine months ended September 30, 2012, respectively, and $7.6 million and $8.7 million for the three and nine months ended September 30, 2011, respectively, with offsetting losses on the related interest rate swaps.

As of December 31, 2011, we had a $350.0 million notional amount receive fixed, pay variable interest rate swap to hedge the changes in the fair value of certain fixed rate long-term debt and entered into another $250.0 million swap during the third quarter of 2012, for a total of $600.0 million. These swaps effectively convert the associated fixed rate long-term debt into floating rate debt and provides for a better matching of interest rates with our short-term investments, which have frequent interest rate resets similar to a floating rate security. The change in fair value of the hedged debt attributable to the hedged benchmark interest rate resulted in a loss of $4.1 million and $8.3 million for the three and nine months ended September 30, 2012 and $14.8 million and $22.0 million for the three and nine months ended September 30, 2011, respectively, with offsetting gains on the related interest rate swaps.

For the three and nine months ended September 30, 2012 and 2011, there was no material ineffectiveness related to our fair value hedges, and no component of the derivative instruments' gain or loss 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.

33

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2012

Note 5 - Derivative Financial Instruments - Continued

Derivatives Not Designated as Hedging Instruments

We have an embedded derivative in a modified coinsurance arrangement for which we include in our realized 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 location and fair values of derivative financial instruments, as reported in our consolidated balance sheets.

	September 30, 2012
	(in millions of dollars)
	Asset Derivatives			Liability Derivatives
	Balance Sheet Location	Fair Value		Balance Sheet Location	Fair Value
Designated as Hedging Instruments
Interest Rate Swaps and Forwards	Other L-T Investments	$	101.3	Other Liabilities	$	33.3
Foreign Exchange Contracts	Other L-T Investments	6.9		Other Liabilities	149.2
Total		$	108.2		$	182.5
Not Designated as Hedging Instruments
Embedded Derivative in Modified Coinsurance Arrangement				Other Liabilities	$	107.0

	December 31, 2011
	(in millions of dollars)
	Asset Derivatives			Liability Derivatives
	Balance Sheet Location	Fair Value		Balance Sheet Location	Fair Value
Designated as Hedging Instruments
Interest Rate Swaps	Other L-T Investments	$	134.2	Other Liabilities	$	32.9
Foreign Exchange Contracts	Other L-T Investments	3.5		Other Liabilities	140.8
Total		$	137.7		$	173.7
Not Designated as Hedging Instruments
Embedded Derivative in Modified Coinsurance Arrangement				Other Liabilities	$	135.7

34

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2012

Note 5 - Derivative Financial Instruments - Continued

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

	Three Months Ended September 30, 2012
	Gain (Loss) Recognized in OCI on Derivatives (Effective Portion)			Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)
	(in millions of dollars)
Interest Rate Swaps	$	20.2		$	11.7		(1)
Interest Rate Swaps	—			0.1			(2)
Interest Rate Swaps	—			(0.5		)	(3)
Foreign Exchange Contracts	—			(0.1		)	(1)
Foreign Exchange Contracts	(14.7		)	(16.7		)	(2)
Total	$	5.5		$	(5.5	)

(1) Gain (loss) recognized in net investment income

(2) Gain (loss) recognized in net realized investment gain (loss)

(3) Loss recognized in interest and debt expense

	Three Months Ended September 30, 2011
	Gain Recognized in OCI on Derivatives (Effective Portion)		Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)
	(in millions of dollars)
Interest Rate Swaps and Forwards	$	8.0	$	8.6		(1)
Interest Rate Swaps	—		0.7			(2)
Interest Rate Swaps	—		(0.4		)	(3)
Foreign Exchange Contracts	—		(0.3		)	(1)
Foreign Exchange Contracts	51.4		46.6			(2)
Total	$	59.4	$	55.2

(1) Gain (loss) recognized in net investment income

(2) Gain recognized in net realized investment gain (loss)

(3) Loss recognized in interest and debt expense

	Nine Months Ended September 30, 2012
	Gain (Loss) Recognized in OCI on Derivatives (Effective Portion)			Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)
	(in millions of dollars)
Interest Rate Swaps and Forwards	$	55.1		$	30.4		(1)
Interest Rate Swaps	—			2.2			(2)
Interest Rate Swaps	—			(1.3		)	(3)
Foreign Exchange Contracts	—			(0.9		)	(1)
Foreign Exchange Contracts	(4.9		)	(18.6		)	(2)
Total	$	50.2		$	11.8

(1) Gain (loss) recognized in net investment income

(2) Gain (loss) recognized in net realized investment gain (loss)

(3) Loss recognized in interest and debt expense

35

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2012

Note 5 - Derivative Financial Instruments - Continued

	Nine Months Ended September 30, 2011
	Gain Recognized in OCI on Derivatives (Effective Portion)		Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)
	(in millions of dollars)
Interest Rate Swaps and Forwards	$	35.4	$	26.0		(1)
Interest Rate Swaps	—		2.5			(2)
Interest Rate Swaps	—		(1.2		)	(3)
Foreign Exchange Contracts	—		(0.9		)	(1)
Foreign Exchange Contracts	40.9		22.0			(2)
Total	$	76.3	$	48.4

(1) Gain (loss) recognized in net investment income

(2) Gain recognized in net realized investment gain (loss)

(3) Loss recognized in interest and debt expense

The following table summarizes the location of and gains (losses) on our embedded derivative in a modified coinsurance arrangement, as reported in our consolidated statements of income.

	Three Months Ended September 30					Nine Months Ended September 30
	2012		2011			2012		2011
	(in millions of dollars)
Gain (Loss) Recognized in Net Realized Investment Gain (Loss)	$	19.7	$	(33.7	)	$	28.7	$	(24.4	)

Note 6 - Segment Information

Our reporting segments are comprised of Unum US, Unum UK, Colonial Life, Closed Block, and Corporate. Effective with the fourth quarter of 2011 we modified our reporting segments to reclassify our long-term care products from the Unum US segment to the Closed Block segment.  We also reclassified our other insurance products not actively marketed which were previously reported in the Corporate and Other segment to the Closed Block segment. Prior period segment results have been adjusted to reflect this change in our reporting classifications.

In the following segment financial data, "operating revenue" excludes net realized investment gains or losses. "Operating income" or "operating loss" excludes net realized investment gains or losses, non-operating retirement-related gains or losses, and income tax. These are considered non-GAAP financial measures. These non-GAAP financial measures of "operating revenue" and "operating income" or "operating loss" differ from revenue and income before income tax as presented in our consolidated statements of income prepared in accordance with GAAP due to the exclusion of before-tax realized investment gains or losses and non-operating retirement-related gains or losses. We previously allocated the amortization of prior period actuarial gains or losses, the component of the net periodic benefit costs for our pensions and other postretirement benefit plans which we consider to be non-operating, to our Corporate segment. During the first quarter of 2012, we determined that we would modify our segment reporting. Effective January 1, 2012, the amortization of prior period actuarial gains or losses is no longer included in operating income or operating loss by segment. Prior period segment results for our Corporate segment have been adjusted to conform to current year reporting.

We measure segment performance excluding these items because we believe this performance measure is a better indicator of the profitability and underlying trends in our business. Realized 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 realized investment gains or losses. Although we may experience realized 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. Our non-operating retirement-related gains or losses are primarily driven by market performance and are not indicative of the operational results of our businesses. However, although we manage our non-operating retirement-related gains or losses separately from the operational performance of our business,

36

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2012

Note 6 - Segment Information - Continued

these gains or losses impact the overall profitability of our company and will increase or decrease over time, depending on market conditions and the resulting impact on the actuarial gains or losses in our pensions and other postretirement benefit plans. The exclusion of these items from segment performance does not replace net income or net loss as a measure of our overall profitability.

A reconciliation of total operating revenue and operating income by segment to revenue and net income as reported in our consolidated statements of income follows:

	Three Months Ended September 30						Nine Months Ended September 30
	2012			2011			2012			2011
	(in millions of dollars)
Operating Revenue by Segment	$	2,606.7		$	2,569.5		$	7,825.6		$	7,685.5
Net Realized Investment Gain (Loss)	21.3			(23.9		)	31.6			(12.3		)
Revenue	$	2,628.0		$	2,545.6		$	7,857.2		$	7,673.2
Operating Income by Segment	$	310.7		$	320.6		$	930.0		$	986.9
Net Realized Investment Gain (Loss)	21.3			(23.9		)	31.6			(12.3		)
Non-operating Retirement-related Loss	(11.6		)	(8.0		)	(34.8		)	(24.0		)
Income Tax	(90.2		)	(86.7		)	(266.3		)	(297.4		)
Net Income	$	230.2		$	202.0		$	660.5		$	653.2

Additionally, effective January 1, 2012, we adopted an accounting standards update regarding the capitalization of costs associated with the acquisition of insurance contracts and applied the amendments retrospectively. Operating income and assets by segment have been adjusted to reflect our retrospective adoption. See Note 2 for further information.

37

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2012

Note 6 - Segment Information - Continued

Premium income by major line of business within each of our segments is presented as follows:

	Three Months Ended September 30					Nine Months Ended September 30
	2012		2011			2012		2011
	(in millions of dollars)
Unum US
Group Disability
Group Long-term Disability	$	392.4	$	393.7		$	1,185.7	$	1,185.3
Group Short-term Disability	120.1		115.2			356.0		339.0
Group Life and Accidental Death & Dismemberment
Group Life	297.3		277.6			885.1		825.3
Accidental Death & Dismemberment	29.2		27.7			86.2		81.6
Supplemental and Voluntary
Individual Disability - Recently Issued	119.9		116.6			357.0		348.3
Voluntary Benefits	153.0		143.6			468.9		433.5
	1,111.9		1,074.4			3,338.9		3,213.0
Unum UK
Group Long-term Disability	102.9		107.3			306.5		318.3
Group Life	56.4		52.1			164.6		151.6
Supplemental and Voluntary	15.9		16.1			48.0		48.5
	175.2		175.5			519.1		518.4
Colonial Life
Accident, Sickness, and Disability	181.8		174.3			541.8		519.7
Life	52.2		47.0			156.3		140.0
Cancer and Critical Illness	65.4		62.4			194.5		186.4
	299.4		283.7			892.6		846.1
Closed Block
Individual Disability	183.1		196.4			554.9		595.0
Long-term Care	159.4		152.1			471.5		453.5
All Other	0.4		(0.9		)	1.9		(0.3		)
	342.9		347.6			1,028.3		1,048.2
Total	$	1,929.4	$	1,881.2		$	5,778.9	$	5,625.7

38

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2012

Note 6 - Segment Information - Continued

Selected operating statement data by segment is presented as follows:

	Unum US		Unum UK		Colonial Life		Closed Block		Corporate			Total
	(in millions of dollars)
Three Months Ended September 30, 2012
Premium Income	$	1,111.9	$	175.2	$	299.4	$	342.9	$	—		$	1,929.4
Net Investment Income	236.3		34.8		33.9		307.3		6.9			619.2
Other Income	31.3		—		—		26.4		0.4			58.1
Operating Revenue	$	1,379.5	$	210.0	$	333.3	$	676.6	$	7.3		$	2,606.7
Operating Income (Loss)	$	216.3	$	27.5	$	68.7	$	25.6	$	(27.4	)	$	310.7
Three Months Ended September 30, 2011
Premium Income	$	1,074.4	$	175.5	$	283.7	$	347.6	$	—		$	1,881.2
Net Investment Income	240.0		43.3		32.5		300.1		13.3			629.2
Other Income	30.4		—		0.1		26.4		2.2			59.1
Operating Revenue	$	1,344.8	$	218.8	$	316.3	$	674.1	$	15.5		$	2,569.5
Operating Income (Loss)	$	209.2	$	34.7	$	66.7	$	30.8	$	(20.8	)	$	320.6
Nine Months Ended September 30, 2012
Premium Income	$	3,338.9	$	519.1	$	892.6	$	1,028.3	$	—		$	5,778.9
Net Investment Income	711.8		120.5		103.5		913.4		23.0			1,872.2
Other Income	93.1		0.1		0.2		78.9		2.2			174.5
Operating Revenue	$	4,143.8	$	639.7	$	996.3	$	2,020.6	$	25.2		$	7,825.6
Operating Income (Loss)	$	634.9	$	96.3	$	206.0	$	66.7	$	(73.9	)	$	930.0
Nine Months Ended September 30, 2011
Premium Income	$	3,213.0	$	518.4	$	846.1	$	1,048.2	$	—		$	5,625.7
Net Investment Income	712.6		139.3		99.6		888.9		44.6			1,885.0
Other Income	90.9		0.1		0.4		80.6		2.8			174.8
Operating Revenue	$	4,016.5	$	657.8	$	946.1	$	2,017.7	$	47.4		$	7,685.5
Operating Income (Loss)	$	609.5	$	138.8	$	205.1	$	93.1	$	(59.6	)	$	986.9

Assets by segment are as follows:

	September 30		December 31
	2012		2011
	(in millions of dollars)
Unum US	$	19,135.0	$	18,583.6
Unum UK	3,945.4		3,549.5
Colonial Life	3,357.9		3,167.8
Closed Block	32,718.9		31,439.5
Corporate	2,962.4		2,814.8
Total	$	62,119.6	$	59,555.2

39

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2012

Note 7 - Pensions and Other Postretirement Benefits

The components of net periodic benefit cost related to the Company sponsored defined benefit pension and other postretirement benefit plans (OPEB) for our employees are as follows:

	Three Months Ended September 30
	Pension Benefits
	U.S. Plans						Non U.S. Plans						OPEB
	2012			2011			2012			2011			2012			2011
	(in millions of dollars)
Service Cost	$	12.2		$	10.7		$	1.2		$	1.1		$	0.4		$	0.5
Interest Cost	21.1			19.4			2.2			2.3			2.3			2.5
Expected Return on Plan Assets	(22.2		)	(21.9		)	(2.8		)	(3.1		)	(0.2		)	(0.2		)
Amortization of:
Net Actuarial Loss	11.5			8.0			0.1			—			—			—
Prior Service Credit	(0.1		)	(0.1		)	—			—			(0.6		)	(0.6		)
Total	$	22.5		$	16.1		$	0.7		$	0.3		$	1.9		$	2.2

	Nine Months Ended September 30
	Pension Benefits
	U.S. Plans						Non U.S. Plans						OPEB
	2012			2011			2012			2011			2012			2011
	(in millions of dollars)
Service Cost	$	36.6		$	32.0		$	3.6		$	3.5		$	1.2		$	1.4
Interest Cost	63.3			58.2			6.4			6.7			7.1			7.5
Expected Return on Plan Assets	(66.5		)	(65.7		)	(8.3		)	(9.2		)	(0.5		)	(0.5		)
Amortization of:
Net Actuarial Loss	34.4			24.0			0.4			—			—			—
Prior Service Credit	(0.4		)	(0.4		)	—			—			(1.9		)	(1.9		)
Total	$	67.4		$	48.1		$	2.1		$	1.0		$	5.9		$	6.5

We have no regulatory contribution requirements for our U.S. qualified defined benefit plan in 2012, but we elected to make a $53.0 million voluntary contribution in the second quarter of 2012. For our U.K. operation, which maintains a separate defined benefit plan, we made required contributions of $1.0 million and $3.1 million in the third quarter and first nine months of 2012, respectively, or approximately £0.7 million and £2.0 million.

40

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2012

Note 8 - Stockholders' Equity and Earnings Per Common Share

Net income per common share is determined as follows:

	Three Months Ended September 30				Nine Months Ended September 30
	2012		2011		2012		2011
	(in millions of dollars, except share data)
Numerator
Net Income	$	230.2	$	202.0	$	660.5	$	653.2
Denominator (000s)
Weighted Average Common Shares - Basic	278,354.4		298,185.8		284,012.8		305,694.5
Dilution for Assumed Exercises of Stock Options and Nonvested Stock Awards	156.6		987.1		478.4		1,223.9
Weighted Average Common Shares - Assuming Dilution	278,511.0		299,172.9		284,491.2		306,918.4
Net Income Per Common Share
Basic	$	0.83	$	0.68	$	2.33	$	2.14
Assuming Dilution	$	0.83	$	0.68	$	2.32	$	2.13

We use the treasury stock method to account for the effect of outstanding stock options, nonvested stock awards, and performance restricted stock units on the computation of dilutive earnings per share. Under this method, these potential common shares will each have a dilutive effect, as individually measured, when the average market price of Unum Group common stock during the period exceeds the exercise price of the stock options, the grant price of the nonvested stock awards, and/or the threshold stock price of performance restricted stock units.

The outstanding stock options have exercise prices ranging from $11.37 to $26.29, the nonvested stock awards have grant prices ranging from $19.38 to $26.31, and the performance restricted stock units had a threshold stock price of $26.00.

In computing earnings per share assuming dilution, only potential common shares that are dilutive (those that reduce earnings per share) are included. Potential common shares not included in the computation of dilutive earnings per share because their impact would be antidilutive, based on current market prices, approximated 2.8 million and 2.4 million shares of common stock for the three and nine month periods ended September 30, 2012, and 2.4 million and 2.1 million shares of common stock for the three and nine month periods ended September 30, 2011.

In May 2010, our board of directors authorized the repurchase of up to $500.0 million of Unum Group’s common stock. The share repurchase program had an expiration date of May 2011. In February 2011, our board of directors authorized the repurchase of up to $1.0 billion of Unum Group's common stock, in addition to the amount remaining to be repurchased under the $500.0 million authorization. The $1.0 billion share repurchase program had an expiration date of August 2012. In July 2012, our board of directors authorized the repurchase of up to $750.0 million of Unum Group's common stock. The $750.0 million share repurchase program has an expiration date of January 2014 and replaced the previous authorization of $1.0 billion that was scheduled toexpire in August 2012.

In February 2011, we repurchased 7.1 million shares, at a cost of $200.0 million, using an accelerated repurchase agreement with a financial counterparty. As part of this transaction, we simultaneously entered into a forward contract indexed to the price of Unum Group common stock, which subjected the transaction to a future price adjustment. Under the terms of the repurchase agreement, we were 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 was to be settled in shares of Unum Group common stock. Any price adjustment we would have been required to pay would have been settled in either cash or common stock at our option. The final price adjustment settlement occurred in March 2011, resulting in the delivery to us of 0.6 million additional shares. In total, we repurchased and retired 7.7 million shares pursuant to the accelerated repurchase agreement, which completed the $500.0 million repurchase authorization and initiated the $1.0 billion repurchase program.

41

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2012

Note 8 - Stockholders' Equity and Earnings Per Common Share - Continued

In addition to these repurchases, for the year ended December 31, 2011, we repurchased an additional 17.7 million shares on the open market at a cost of $419.9 million, including commissions of $0.3 million. For the three and nine month periods ended September 30, 2012, we repurchased an additional 5.1 million and 18.6 million shares on the open market at a cost of $100.2 million and $400.5 million, respectively, including commissions of $0.1 million and $0.4 million, respectively. The dollar value of shares remaining under the $750.0 million repurchase program at September 30, 2012 was approximately $650.0 million.

All repurchased shares, except for the 7.7 million shares which were retired in 2011, have been classified as treasury stock and accounted for using the cost method.

Unum Group has 25,000,000 shares of preferred stock authorized with a par value of $0.10 per share. No preferred stock has been issued to date.

Note 9 - Commitments and Contingent Liabilities

Contingent Liabilities

We are a defendant in a number of litigation 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.

Claims 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.

42

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2012

Note 9 - Commitments and Contingent Liabilities - Continued

Miscellaneous Matters

In September 2008, we received service of a complaint, in an adversary proceeding in connection with the bankruptcy case In re Quebecor World (USA) Inc., et al. entitled Official Committee of Unsecured Creditors of Quebecor World (USA) Inc., et al., v. American United Life Insurance Company, et al., filed in the United States Bankruptcy Court for the Southern District of New York.  The complaint alleges that we received preference payments relating to notes held by certain of our insurance subsidiaries and seeks to avoid and recover such payments plus interest and cost of the action.  On July 27, 2011, the Bankruptcy Court ruled in our favor, granting a summary judgment motion to dismiss the case against us and the other defendants. On September 28, 2012, the United States District Court for the Southern District of New York affirmed the Bankruptcy Court's decision to dismiss the case. On October 23, 2012, the plaintiff filed a notice of appeal.

In October 2010, Denise Merrimon, Bobby S. Mowery, and all others similarly situated vs. Unum Life Insurance Company of America, was filed in the United States District Court for the District of Maine. This is a putative class action alleging that we breached fiduciary duties owed to certain beneficiaries under certain group life insurance policies when we paid life insurance proceeds by establishing interest-bearing retained asset accounts rather than by mailing checks. Plaintiffs seek to represent a class of beneficiaries under group life insurance contracts that were part of ERISA employee welfare benefit plans and under which we paid death benefits via retained asset accounts. The plaintiffs' principal theories in the case are: (1) funds held in retained asset accounts were plan assets, and the proceeds earned by us from investing those funds belonged to the beneficiaries, and (2) payment of claims using retained asset accounts did not constitute payment under Maine's late payment statute, requiring us to pay interest on the undrawn retained asset account funds at an annual rate of 18 percent. On February 3, 2012, the District Court issued an opinion rejecting both of plaintiffs' principal theories and ordering judgment for us. At the same time, however, the District Court held that we breached a fiduciary duty to the beneficiaries by failing to pay rates comparable to the best rates available in the market for demand deposits. The District Court also certified a class of people who, during a certain period of time, were beneficiaries under certain group life insurance contracts that were part of ERISA employee welfare benefit plans and were paid death benefits using retained asset accounts.  The District Court authorized the parties to make an immediate appeal of its decision to the First Circuit Court of Appeals, and each of the parties sought leave for an early appeal on the issues raised by the District Court's rulings, but the First Circuit decided not to hear the appeal at this time. Therefore, the parties are required to wait until the proceedings in the District Court have concluded for further resolution of those issues. The First Circuit did not rule on or discuss the merits of the case. The case is proceeding in the District Court with discovery on the issue of damages and notice to class members.

In March 2011, we received a request for information from an independent third party as part of an examination on behalf of 26 states and the District of Columbia to evaluate our compliance with the unclaimed property laws of the participating states. Industry-wide practices are currently under review concerning the identification and handling of unclaimed property by insurers, and numerous other insurers are under similar examination. We are cooperating fully with this examination.

In July 2011, the New York State Department of Financial Services issued a special request to approximately 160 insurers, including Unum Group's New York licensed insurance subsidiaries, which requires the insurers to cross-check their life insurance policies, annuity contracts, and retained asset accounts with the latest version of the Social Security Master Death Index to identify any matches. Insurers are also requested to investigate the matches to determine if death benefits are due, to locate the beneficiaries, and to make payments where appropriate. We accrued an estimated loss contingency in the fourth quarter of 2011, the amount of which was immaterial to our consolidated financial position and results of operations. We completed our review during the first quarter of 2012. The estimated loss contingency which we established in the fourth quarter of 2011 was sufficient.

It is possible other state jurisdictions may pursue similar investigations or inquiries or issue directives similar to the New York State Department of Financial Services' letter. It is possible that the audits and related activity may result in additional payments to beneficiaries, the payment of abandoned funds under state law, and/or administrative penalties. We are currently unable to estimate the reasonably possible amount of any additional payments.

43

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2012

Note 9 - Commitments and Contingent Liabilities - Continued

Summary

Various lawsuits against us, in addition to those discussed above, have arisen in the normal course of business. 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. It is possible that our results of operations or cash flows in a particular period could be materially affected by an ultimate unfavorable outcome of pending litigation or regulatory matters depending, in part, on our results of operations or cash flows for the particular period. We believe, however, that the ultimate outcome of all pending litigation and regulatory matters, after consideration of applicable reserves and rights to indemnification, should not have a material adverse effect on our financial position.

Note 10 - Other

Debt

At September 30, 2012, short-term debt consisted of $458.3 million of securities lending transactions.

In August 2012, we issued $250.0 million of unsecured senior notes in a public offering. These notes, due in 2042, bear interest at a fixed rate of 5.75% and are payable semi-annually. The notes are callable at or above par and rank equally in right of payment with all of our other unsecured and unsubordinated debt.

During the nine months ended September 30, 2012, we made principal payments of $38.1 million and $7.5 million on our senior secured non-recourse floating rate notes issued by Northwind Holdings, LLC and Tailwind Holdings, LLC, respectively.

Income Tax

At September 30, 2012, we had a liability of $32.2 million for unrecognized tax benefits, all of which is associated with deferred tax assets. During the second quarter of 2012, we released a liability for unrecognized tax benefits of $61.1 million along with a corresponding deferred tax asset. We recognized interest expense (benefits) and penalties of less than $0.1 million and $(10.5) million for the three and nine months ended September 30, 2012, respectively, and $1.5 million and $4.1 million for the three and nine months ended September 30, 2011, respectively.

During 2010, the Internal Revenue Service (IRS) completed its examination of tax years 2005 and 2006 and issued its revenue agent's report (RAR) in December 2010. In January 2011, we filed a protest to the RAR with respect to all significant adverse proposed adjustments. Although we have not yet reached a final settlement with the IRS for these years, the appeal may be resolved in whole or in part within 12 months, and statutes of limitations may expire in multiple jurisdictions within the same period.  As a result of the potential settlement and its effect on subsequent years, it is reasonably possible that our liability for unrecognized tax benefits could decrease within 12 months by $17.2 million to $22.0 million, with a commensurate decrease in deferred tax assets.  We believe sufficient provision has been made for all uncertain tax provisions and that any adjustments by tax authorities with respect to such positions would not have a material adverse effect on our financial position, liquidity, or results of operations.

During the third quarter of 2012, an income tax rate reduction was enacted which reduced the tax rate in the U.K. from 25 percent to 24 percent retroactive to April 2012 and from 24 percent to 23 percent effective April 2013. During the third quarter of 2011, an income tax rate reduction was enacted which reduced the tax rate in the U.K. from 27 percent to 26 percent retroactive to April 2011 and from 26 percent to 25 percent effective April 2012.  We are required to adjust deferred tax assets and liabilities through income on the date of enactment of a rate change, and as such, we recorded a reduction of $9.3 million and $6.8 million to our income tax expense during the third quarters of 2012 and 2011, respectively.

44

Report of Independent Registered Public Accounting Firm

Board of Directors and Stockholders

Unum Group and Subsidiaries

We have reviewed the consolidated balance sheet of Unum Group and subsidiaries as of September 30, 2012, and the related consolidated statements of income and comprehensive income for the three and nine-month periods ended September 30, 2012 and 2011, and the consolidated statements of stockholders' equity and cash flows for the nine-month periods ended September 30, 2012 and 2011. These financial statements are the responsibility of the Company's management.

We conducted our review in accordance with the standards of the Public Company Accounting Oversight Board (United States). A review of interim financial information consists principally of applying analytical procedures and making inquiries of persons responsible for financial and accounting matters. It is substantially less in scope than an audit conducted in accordance with the standards of the Public Company Accounting Oversight Board, the objective of which is the expression of an opinion regarding the financial statements taken as a whole. Accordingly, we do not express such an opinion.

Based on our review, we are not aware of any material modifications that should be made to the consolidated financial statements referred to above for them to be in conformity with U.S. generally accepted accounting principles.

As discussed in Note 2 to the consolidated financial statements, Unum Group and subsidiaries changed its method of accounting for deferred acquisition costs as a result of the adoption of amendments to the FASB Accounting Standards Update No. 2010-26, Insurance (Topic 944): Accounting for Costs Associated with Acquiring or Renewing Insurance Contracts (ASU 2010-26).

We have previously audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States), the consolidated balance sheet of Unum Group and subsidiaries as of December 31, 2011, and the related consolidated statements of income, stockholders’ equity, cash flows and comprehensive income for the year then ended not presented herein and in our report dated February 24, 2012, we expressed an unqualified opinion on those consolidated financial statements. As described in Note 2, on January 1, 2012, Unum Group and subsidiaries changed its method of accounting for deferred acquisition costs and applied the change on a retrospective basis resulting in revision of the December 31, 2011 consolidated balance sheet. We have not audited and reported on the revised balance sheet reflecting the adoption of ASU 2010-26.

/s/ ERNST & YOUNG LLP

Chattanooga, Tennessee

November 1, 2012

45

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

Introduction

Unum Group, a Delaware general business corporation, and its insurance and non-insurance subsidiaries, which collectively we refer to as the Company, operate in the United States, the United Kingdom, and, to a limited extent, in certain other countries around the world. The principal operating subsidiaries in the United States are Unum Life Insurance Company of America (Unum America), Provident Life and Accident Insurance Company (Provident), The Paul Revere Life Insurance Company (Paul Revere Life), and Colonial Life & Accident Insurance Company, and in the United Kingdom, Unum Limited. We are the largest provider of disability insurance products in the United States and the United Kingdom. We also provide a complementary portfolio of other insurance products, including employer- and employee-paid group benefits, life insurance, and other related services.

We have three major business segments: Unum US, Unum UK, and Colonial Life. Our other segments are the Closed Block and the Corporate segments. These segments are discussed more fully under "Segments Results" contained in this Item 2.

As one of the leading providers of employee benefits in the U.S. and the U.K., we offer a broad portfolio of products and services to meet the diverse and rapidly changing needs of employers and their employees. The unfortunate reality is that most lower- and middle-income workers in the U.S. and the U.K. lack financial protection for themselves and their families should death, illness, or injury occur, a need that has been made even more apparent during the continuing economic downturn.  Additionally, governments in the U.S. and U.K., and throughout the world, are struggling to address growing deficit problems, limiting their ability to offer some of the financial protections that they have provided in the past.  As a result, we believe there is a growing need for financial protection products of the type we offer.

Specifically, we offer group, individual, and voluntary benefits, either as stand-alone products or combined with other coverages, that create comprehensive benefits solutions for employers of all sizes by helping them attract and retain a stronger workforce while protecting the incomes and lifestyles of their employees. We believe employer-sponsored benefits represent the single most effective way to provide workers with access to the information and options they need to protect their lifestyle and provide financial security. 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 services and products. For many of these people, employer-sponsored benefits are the primary defense against the financial hardship associated with death, illness, or injury.

We have established a corporate culture consistent with the social values our products provide. We are committed not only to meeting the needs of our customers who depend on us, but also to operating with integrity and being accountable for our actions. Our sound and consistent business practices, strong internal compliance program, and comprehensive risk management strategy enable us to operate efficiently as well as to identify and address potential areas of risk in our business. We have also applied these same values to our social responsibility efforts. Because we see important links between the obligations we have to all of our stakeholders, we place a strong emphasis on contributing to positive change in our communities.

We are an industry leader, and we believe we are well positioned in our sector with solid long-term growth prospects. Given the nature of our business, however, we are sensitive to economic and financial market movements, including interest rates, consumer confidence, and employment levels. Our business outlook, which recognizes both the challenges of the current economic environment as well as the mitigating impact of risk-reducing actions we have taken in recent years, is consistent with our risk appetite. We remain cautious of the near-term outlook for employment levels and wages, both of which limit opportunities for premium growth, but we believe we are poised to profitably grow as employment trends improve.

This discussion and analysis should be read in conjunction with the consolidated financial statements and notes thereto in Part I, Item 1 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 6, 7, 7A, and 8 of our annual report on Form 10-K for the year ended December 31, 2011.

46

Executive Summary

Throughout the remainder of 2012, we intend to remain focused on disciplined top-line growth in select markets and a sustainable capital generation and deployment strategy. We continue to believe that our strategy of delivering a broad set of financial protection choices to employees while also enabling employers to define their financial contribution in support of those choices should enable us to continue in a leadership position in our markets over the long term.

A discussion of our operating performance and capital management follows.

Retrospective Adoption of Accounting Standards Update

In October 2010, the Financial Accounting Standards Board (FASB) issued an update to address the diversity in practice regarding the interpretation of which costs relating to the acquisition of new or renewal insurance contracts qualify as deferred acquisition costs.  The amendments in the update require that only incremental direct costs associated with the successful acquisition of a new or renewal insurance contract can be capitalized. All other costs are to be expensed as incurred. We adopted this update effective January 1, 2012 and applied the amendments retrospectively, adjusting 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.

Operating Performance and Capital Management

For the third quarter of 2012, we reported net income of $230.2 million, or $0.83 per diluted common share, compared to net income of $202.0 million, or $0.68 per diluted common share, in the same period of 2011. For the first nine months of 2012, net income was $660.5 million, or $2.32 per diluted common share, compared to net income of $653.2 million, or $2.13 per diluted common share, in the same period of 2011. After-tax operating income, which excludes realized investment gains or losses and non-operating retirement-related gains or losses, was $224.0 million, or $0.80 per diluted common share, in the third quarter of 2012 compared to $223.1 million, or $0.75 per diluted common share, in the same period of 2011. After-tax operating income was $662.5 million, or $2.33 per diluted common share, in the first nine months of 2012 compared to $677.2 million, or $2.21 per diluted common share, in the same period of 2011. Our third quarter and first nine months of 2012 net income per share and after-tax operating income per share, as compared to the same periods of 2011, were aided by the repurchase of our common stock throughout 2011 and during the first nine months of 2012. Total operating revenue by segment during the third quarter and first nine months of 2012 was higher than the comparable periods of 2011, driven by increases in premium income. Total operating income by segment decreased in the third quarter and first nine months of 2012 relative to the same periods of 2011, with favorable earnings in Unum US and Colonial Life offset by lower earnings reported for our other segments. See additional information in "Consolidated Operating Results," "Reconciliation of Non-GAAP Financial Measures," and "Segment Results" contained in this Item 2.

Our Unum US segment reported increases in segment operating income of 3.4 percent and 4.2 percent, respectively, in the third quarter and first nine months of 2012 compared to the same periods of 2011, with higher operating revenue and continued favorable expense management. Although Unum US premium income increased 3.5 percent and 3.9 percent, respectively, in the third quarter and first nine months of 2012 compared to the same periods of 2011, the ongoing high levels of unemployment and the competitive environment have continued to pressure our premium income growth during 2012. In particular, premium growth from existing customers continues to be unfavorably impacted by lower salary growth and lower growth in the number of employees covered under existing policies, although we experienced improvement in the third quarter and first nine months of 2012 relative to the comparable prior year periods. The benefit ratios for our Unum US segment for the third quarter and first nine months of 2012 were 73.0 percent and 72.5 percent, respectively, generally consistent with the levels reported in the same periods of 2011. Risk results for the group disability and supplemental and voluntary product lines were generally consistent with the prior year periods, while risk results for group life and accidental death and dismemberment product lines were unfavorable. Unum US sales increased 4.2 percent and 9.2 percent, respectively, in the third quarter and first nine months of 2012 compared to the same periods of 2011, with sales increases in most of our product lines and market segments. Our group core market segment, which we define for Unum US as employee groups with fewer than 2,000 lives, reported sales increases of 4.6 percent and 9.3 percent, respectively, in the third quarter and first nine months of 2012 compared to the same periods of 2011. Group large case sales decreased 0.8 percent in the third quarter of 2012 compared to the third quarter of 2011, but increased 4.8 percent in the first nine months of 2012 compared to the same period of 2011. Sales in our individual disability - recently issued line of business increased 13.2 percent and 10.3 percent, respectively, and voluntary benefits sales increased 2.6 percent and 10.5 percent, respectively, in the third quarter and first nine months of 2012 compared to the same periods of 2011. Premium persistency was above the levels of 2011 for all products except short-term disability and voluntary benefits and remains high relative to historical levels.

47

Our Unum UK segment reported decreases in segment operating income of 19.5 percent and 28.9 percent, respectively, in the third quarter and first nine months of 2012, as measured in Unum UK's local currency, relative to the same periods of 2011, with higher premium income offset by lower investment income and less favorable risk performance in the group life product line. Premium income grew 1.6 percent and 2.4 percent, respectively, in the third quarter and first nine months of 2012 compared to the same periods of 2011, although premium growth continues to be unfavorably impacted due to lower persistency as a result of premium rate increases. The benefit ratios for Unum UK were 77.7 percent and 78.5 percent, respectively, in the third quarter and first nine months of 2012 compared to 78.8 percent and 72.7 percent, respectively, in the same periods of 2011, with less favorable risk results in group life in the third quarter and year-to-date and less favorable risk results for group disability on a year-to-date basis. Unum UK sales decreased 19.5 percent in the third quarter of 2012, but increased 17.5 percent in the first nine months of 2012 compared to the same periods of 2011, as measured in Unum UK's local currency. The decline in sales in the third quarter of 2012 was driven primarily by lower group life sales, while sales growth for the first nine months of 2012 relative to the same period of 2011 was driven by higher sales in both group disability and group life.

Our Colonial Life segment reported increases in segment operating income of 3.0 percent and 0.4 percent in the third quarter and first nine months of 2012 compared to the same periods of 2011, with higher operating revenue and continued favorable expense management. Premium income grew 5.5 percent in both the third quarter and first nine months of 2012 compared to the same periods of 2011. The benefit ratios for Colonial Life were 52.9 percent and 52.5 percent, respectively, in the third quarter and first nine months of 2012 compared to 52.6 percent and 51.7 percent, respectively, in the same periods of 2011 due to less favorable risk results in the life product line during the third quarter and first nine months and in the cancer and critical illness product line on a year-to-date basis. Colonial Life sales decreased 5.8 percent and 1.8 percent, respectively, in the third quarter and first nine months of 2012 compared to the same periods of 2011. Commercial market sales in the third quarter and first nine months of 2012 were lower relative to the same periods of 2011, with decreases of 30.1 percent and 6.8 percent, respectively, in the large case commercial market segment, which we define as accounts with greater than 1,000 lives. Sales in the core commercial market segment decreased 1.8 percent in the third quarter of 2012 relative to the third quarter of 2011, but increased 0.5 percent in the first nine months of 2012 compared to the same period of 2011. Sales were 7.3 percent and 7.2 percent lower in the public sector market in the third quarter and first nine months of 2012 compared to the same periods of 2011. Persistency in 2012 was higher than 2011 for the cancer and critical illness and accident, sickness, and disability product lines, but was slightly lower for the life product line.

Our investment portfolio continues to perform well, although our net investment income declined in the third quarter and first nine months of 2012 compared to the same periods of 2011. The net unrealized gain on our fixed maturity securities was $7.3 billion at September 30, 2012, compared to $5.8 billion at December 31, 2011.

We believe our capital and financial positions are strong. At September 30, 2012, 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 407 percent, compared to 405 percent at December 31, 2011. Our leverage ratio, when calculated using consolidated debt to total consolidated capital, was 30.5 percent at September 30, 2012, compared to 28.7 percent at December 31, 2011. The increase was due to the August 2012 issuance of $250.0 million of 5.75% senior notes and the increase in short-term debt related to securities lending agreements outstanding at September 30, 2012, partially offset by our year-to-date 2012 principal payments on the debt of Northwind Holdings, LLC (Northwind Holdings) and Tailwind Holdings, LLC (Tailwind Holdings). Our leverage ratio, when calculated excluding the non-recourse debt and associated capital of Northwind Holdings and Tailwind Holdings and the short-term debt arising from securities lending agreements, was 25.2 percent at September 30, 2012, compared to 23.5 percent at December 31, 2011. Cash and marketable securities at our holding companies was $762 million at September 30, 2012 compared to $756 million at December 31, 2011.

Further discussion is included in "Consolidated Operating Results," "Segment Results," "Investments," and "Liquidity and Capital Resources" contained in this Item 2.

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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 reserves for policy and contract benefits, deferred acquisition costs, valuation of investments, pension and postretirement benefit plans, income taxes, and contingent liabilities. There have been no significant changes in our critical accounting estimates during the first nine months of 2012 other than changes made to our capitalization policies for deferred acquisition costs, in accordance with our adoption of the accounting standards update as disclosed in Note 2 of the "Notes to Consolidated Financial Statements" contained herein in Item 1.

For additional information, refer to our significant accounting policies in Note 1 of the "Notes to Consolidated Financial Statements" in Part II, Item 8 and "Critical Accounting Estimates in Part II, Item 7 of our annual report on Form 10-K for the year ended December 31, 2011.

Accounting Developments

For information on new accounting standards and the impact, if any, on our financial position or results of operations, see Note 2 of the "Notes to Consolidated Financial Statements" contained herein in Item 1.

49

Consolidated Operating Results

(in millions of dollars)
	Three Months Ended September 30								Nine Months Ended September 30
	2012			% Change		2011			2012			% Change		2011
Revenue
Premium Income	$	1,929.4		2.6	%	$	1,881.2		$	5,778.9		2.7	%	$	5,625.7
Net Investment Income	619.2			(1.6	)	629.2			1,872.2			(0.7	)	1,885.0
Net Realized Investment Gain (Loss)	21.3			189.1		(23.9		)	31.6			N.M.		(12.3		)
Other Income	58.1			(1.7	)	59.1			174.5			(0.2	)	174.8
Total Revenue	2,628.0			3.2		2,545.6			7,857.2			2.4		7,673.2
Benefits and Expenses
Benefits and Change in Reserves for Future Benefits	1,686.9			3.1		1,635.6			5,033.0			4.2		4,828.0
Commissions	227.7			3.3		220.5			690.8			4.2		662.7
Interest and Debt Expense	36.6			4.3		35.1			107.3			(0.7	)	108.1
Deferral of Acquisition Costs	(111.0		)	0.8		(110.1		)	(347.6		)	3.9		(334.7		)
Amortization of Deferred Acquisition Costs	87.0			3.2		84.3			285.6			4.3		273.9
Compensation Expense	187.0			(5.7	)	198.3			589.3			(1.6	)	598.9
Other Expenses	193.4			0.1		193.2			572.0			(2.3	)	585.7
Total Benefits and Expenses	2,307.6			2.2		2,256.9			6,930.4			3.1		6,722.6
Income Before Income Tax	320.4			11.0		288.7			926.8			(2.5	)	950.6
Income Tax	90.2			4.0		86.7			266.3			(10.5	)	297.4
Net Income	$	230.2		14.0		$	202.0		$	660.5		1.1		$	653.2

N.M.: Not a Meaningful Percentage

The comparability of our financial results between years is affected by the fluctuation in the British pound sterling to dollar exchange rate. The functional currency of our U.K. operations is the British pound sterling. In periods when the pound weakens, 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 in relation to the prior period. Our weighted average pound/dollar exchange rate was 1.590 and 1.608 for the third quarters of 2012 and 2011, respectively, and 1.576 and 1.616 for the first nine months of 2012 and 2011, respectively. If the 2012 results for our U.K. operations had been translated at the higher exchange rates of the third quarter and first nine months of 2011, our operating revenue and operating income by segment would have been higher by approximately $3.6 million and $0.3 million, respectively, for the third quarter of 2012 and approximately $15.2 million and $2.4 million, respectively, for the first nine months of 2012. 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.

Consolidated premium income in the third quarter and first nine months of 2012 compared to the same periods of 2011 includes premium growth for each of our three major business segments. Premium income declined, as expected, in our Closed Block segment, although our long-term care closed line of business experienced premium growth relative to the third quarter and first nine months of 2011 due to the continued high level of premium persistency and a limited amount of group sales which occurred during 2011 and the first part of 2012, as well as rate increases implemented for certain of our individual long-term care policies.

Net investment income was lower in the third quarter and first nine months of 2012 relative to the same periods of 2011 due primarily to lower income from bond call premiums, lower income on index-linked bonds which support the claim reserves associated with certain of our Unum UK group policies that provide for inflation-linked increases, and a decline in the yield on invested assets, partially offset by higher asset levels and higher income from prepayments on mortgage-backed securities.

We recognized in earnings net realized investment gains of $21.3 million and $31.6 million in the third quarter and first nine months of 2012, respectively, compared to losses of $23.9 million and $12.3 million in the third quarter and first nine months of 2011, respectively. Included in these amounts were other-than-temporary impairment losses on fixed maturity securities of

50

$1.2 million and $4.2 million in the third quarter and first nine months of 2011, respectively, all of which were recognized in earnings.

Also recognized in earnings through realized investment gains and losses was the change in the fair value of an embedded derivative in a modified coinsurance arrangement. Changes in the fair value of this embedded derivative resulted in realized gains of $19.7 million and $28.7 million in the third quarter and first nine months of 2012, respectively, compared to losses of $33.7 million and $24.4 million in the third quarter and first nine months of 2011, respectively. Gains and losses on this embedded derivative result primarily from changes in credit spreads in the overall investment market.

The benefit ratios were 87.4 percent and 87.1 percent, respectively, in the third quarter and first nine months of 2012 compared to 86.9 percent and 85.8 percent in each of the comparable periods of 2011, with slightly less favorable year-over-year risk results for our total Unum US segment and Colonial Life segment. Risk results for our Unum UK segment were favorable in the third quarter of 2012 relative to the same period of last year, but were unfavorable in the first nine months of 2012 compared to the first nine months of 2011. Risk results for our Closed Block segment were unfavorable in the third quarter and first nine months of 2012 compared to the same periods of 2011, with unfavorable long-term care risk results partially offset by favorable individual disability risk results. Further discussion of our line of business risk results for each of our segments is included in "Segment Results" as follows.

Interest and debt expense for the third quarter of 2012 was higher than the same period of 2011 due primarily to the issuance of $250.0 million of 5.75% senior notes in August 2012. Interest and debt expense for the first nine months of 2012 was lower than the same period of 2011 due primarily to the maturity of $225.1 million of 7.625% senior notes in March 2011, partially offset by the August 2012 issuance of senior notes.

The deferral of acquisition costs increased in the third quarter and first nine months of 2012 compared to the same periods of 2011 due primarily to the continued growth in certain of our product lines and the associated increase in deferrable expenses.

The amortization of acquisition costs in the third quarter and first nine months of 2012 was higher than the same periods of 2011 due primarily to continued growth in the level of the deferred asset for certain of our product lines. Comparability between years was also impacted by adjustments for premium persistency relative to assumptions for certain issue years as well as prospective unlocking for actual experience relative to assumptions for certain of our interest-sensitive product lines.

Other expenses, including compensation expense, were lower in the third quarter and first nine months of 2012 compared to the same periods of 2011 due to our continued focus on operating effectiveness and expense management.

Effective April 2011, the U.K. government began decreasing its corporation tax rates at a rate of at least one percent per year, with the ultimate goal of reducing the rate from 28 percent to 23 percent, with the final reduction to become effective April 2013. In accordance with GAAP, we are required to adjust deferred tax assets and liabilities through income on the date of enactment of a rate change, the first of which occurred during the third quarter of 2010, with additional rate changes enacted during the third quarters of 2011 and 2012. We recorded a reduction of $6.8 million to our income tax expense during the third quarter of 2011 and an additional reduction of $9.3 million in the third quarter of 2012 to reflect the impact of the rate changes on our net deferred tax liability related to our U.K. operations.

Our income tax rate for the third quarter and first nine months of 2012 was lower relative to the same periods of 2011 due primarily to the previously discussed U.K. tax rate reductions and the second quarter of 2012 release of an $11.0 million tax liability related to unrecognized tax benefits.

Reconciliation of Non-GAAP 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 GAAP. We believe operating income or loss which excludes the specified items listed in our reconciliation is a better performance measure and a better indicator of the profitability and underlying trends in our business. Realized 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 realized investment gains or losses. Although we may experience realized 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. Certain components of the net periodic benefit cost for our pensions and other postretirement benefit plans, namely the amortization of prior period actuarial gains or losses, are primarily

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driven by market performance and are not indicative of the operational results of our businesses. We believe that excluding the amortization of prior period gains or losses from operating income by segment provides investors with additional information for comparison and analysis of our operating results. Although we manage our non-operating retirement-related gains or losses separately from the operational performance of our business, these gains or losses impact the overall profitability of our company and will increase or decrease over time, depending on market conditions and the resulting impact on the actuarial gains or losses in our pensions and other postretirement benefit plans. We may in the future 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. The non-GAAP financial measures of "operating revenue," "operating income" or "operating loss," and "after-tax operating income" differ from revenue, income (loss) before income tax, and net income as presented in our consolidated operating results and in income statements prepared in accordance with GAAP due to the exclusion of before-tax realized investment gains or losses and non-operating retirement-related gains or losses.

A reconciliation of operating revenue by segment to revenue, operating income by segment to net income, and after-tax operating income to net income is as follows:

(in millions of dollars)
	Three Months Ended September 30						Nine Months Ended September 30
	2012			2011			2012			2011
Operating Revenue by Segment	$	2,606.7		$	2,569.5		$	7,825.6		$	7,685.5
Net Realized Investment Gain (Loss)	21.3			(23.9		)	31.6			(12.3		)
Total Revenue	$	2,628.0		$	2,545.6		$	7,857.2		$	7,673.2
Operating Income by Segment	$	310.7		$	320.6		$	930.0		$	986.9
Net Realized Investment Gain (Loss)	21.3			(23.9		)	31.6			(12.3		)
Non-operating Retirement-related Loss	(11.6		)	(8.0		)	(34.8		)	(24.0		)
Income Tax	(90.2		)	(86.7		)	(266.3		)	(297.4		)
Net Income	$	230.2		$	202.0		$	660.5		$	653.2

	Three Months Ended September 30
	2012						2011
	(in millions)			per share *			(in millions)			per share *
After-tax Operating Income	$	224.0		$	0.80		$	223.1		$	0.75
Non-operating Retirement-related Loss	(11.6		)	(0.04		)	(8.0		)	(0.03		)
Income Tax on Non-operating Retirement-related Loss	4.0			0.01			2.8			0.01
Net Realized Investment Gain (Loss)	21.3			0.08			(23.9		)	(0.08		)
Income Tax on Net Realized Investment Gain (Loss)	(7.5		)	(0.02		)	8.0			0.03
Net Income	$	230.2		$	0.83		$	202.0		$	0.68
	Nine Months Ended September 30
	2012						2011
	(in millions)			per share *			(in millions)			per share *
After-tax Operating Income	$	662.5		$	2.33		$	677.2		$	2.21
Non-operating Retirement-related Loss	(34.8		)	(0.12		)	(24.0		)	(0.08		)
Income Tax on Non-operating Retirement-related Loss	12.1			0.04			8.4			0.03
Net Realized Investment Gain (Loss)	31.6			0.11			(12.3		)	(0.04		)
Income Tax on Net Realized Investment Gain (Loss)	(10.9		)	(0.04		)	3.9			0.01
Net Income	$	660.5		$	2.32		$	653.2		$	2.13

* Assuming Dilution

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Sales

Shown below are sales results for our three major business segments.

(in millions)
	Three Months Ended September 30						Nine Months Ended September 30
	2012		% Change		2011		2012		% Change		2011
Unum US	$	122.8	4.2	%	$	117.8	$	479.3	9.2	%	$	438.9
Unum UK	£	10.7	(19.5	)	£	13.3	£	45.6	17.5		£	38.8
Colonial Life	$	78.4	(5.8	)	$	83.2	$	235.3	(1.8	)	$	239.5

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, 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 changes 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 UK, Colonial Life, Closed Block, and Corporate.

Effective January 1, 2012, we adopted an accounting standards update regarding the capitalization of costs associated with the acquisition of insurance contracts and applied the amendments retrospectively. Operating income by segment has been adjusted to reflect our retrospective adoption. See Note 2 of the "Notes to Consolidated Financial Statements" contained herein in Item 1 for further discussion.

In the following segment financial data, "operating revenue" excludes net realized investment gains or losses. "Operating income" or "operating loss" excludes net realized investment gains or losses, non-operating retirement-related gains or losses, and income tax. These are considered non-GAAP financial measures. These non-GAAP financial measures of "operating revenue" and "operating income" or "operating loss" differ from revenue and income before income tax as presented in our consolidated statements of income prepared in accordance with GAAP due to the exclusion of before-tax realized investment gains or losses and non-operating retirement-related gains or losses. We previously allocated the amortization of prior period actuarial gains or losses, the component of the net periodic benefit costs for our pensions and other postretirement benefit plans which we consider to be non-operating, to our Corporate segment. During the first quarter of 2012, we determined that we would modify our segment reporting. Effective January 1, 2012, the amortization of prior period actuarial gains or losses is no longer included in operating income or operating loss by segment. Prior period segment results for our Corporate segment have been adjusted to conform to current year reporting. See "Reconciliation of Non-GAAP Financial Measures" contained in this Item 2.

Financial information for each of our reporting segments is as follows.

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Unum US Segment

The Unum US segment includes group long-term and short-term disability insurance, group life and accidental death and dismemberment products, and supplemental and voluntary lines of business, which are comprised of individual disability - recently issued insurance and voluntary benefits products.

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
	2012			% Change		2011			2012			% Change		2011
Operating Revenue
Premium Income	$	1,111.9		3.5	%	$	1,074.4		$	3,338.9		3.9	%	$	3,213.0
Net Investment Income	236.3			(1.5	)	240.0			711.8			(0.1	)	712.6
Other Income	31.3			3.0		30.4			93.1			2.4		90.9
Total	1,379.5			2.6		1,344.8			4,143.8			3.2		4,016.5
Benefits and Expenses
Benefits and Change in Reserves for Future Benefits	811.7			3.8		782.3			2,422.3			4.1		2,325.8
Commissions	124.4			4.1		119.5			383.4			6.3		360.7
Interest and Debt Expense	0.2			(33.3	)	0.3			0.8			—		0.8
Deferral of Acquisition Costs	(56.6		)	2.9		(55.0		)	(182.8		)	8.7		(168.2		)
Amortization of Deferred Acquisition Costs	42.3			1.7		41.6			149.1			6.0		140.6
Other Expenses	241.2			(2.3	)	246.9			736.1			(1.5	)	747.3
Total	1,163.2			2.4		1,135.6			3,508.9			3.0		3,407.0
Operating Income Before Income Tax and Net Realized Investment Gains and Losses	$	216.3		3.4		$	209.2		$	634.9		4.2		$	609.5
Operating Ratios (% of Premium Income):
Benefit Ratio	73.0		%			72.8		%	72.5		%			72.4		%
Other Expense Ratio	21.7		%			23.0		%	22.0		%			23.3		%
Before-tax Operating Income Ratio	19.5		%			19.5		%	19.0		%			19.0		%

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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
	2012			% Change		2011			2012			% Change		2011
Operating Revenue
Premium Income
Group Long-term Disability	$	392.4		(0.3	)%	$	393.7		$	1,185.7		—	%	$	1,185.3
Group Short-term Disability	120.1			4.3		115.2			356.0			5.0		339.0
Total Premium Income	512.5			0.7		508.9			1,541.7			1.1		1,524.3
Net Investment Income	142.9			(6.6	)	153.0			432.3			(4.8	)	454.2
Other Income	23.4			1.3		23.1			70.0			4.3		67.1
Total	678.8			(0.9	)	685.0			2,044.0			(0.1	)	2,045.6
Benefits and Expenses
Benefits and Change in Reserves for Future Benefits	435.1			—		435.0			1,307.6			1.4		1,289.4
Commissions	39.4			(1.3	)	39.9			120.1			(0.1	)	120.2
Interest and Debt Expense	0.2			(33.3	)	0.3			0.8			—		0.8
Deferral of Acquisition Costs	(5.6		)	5.7		(5.3		)	(17.5		)	9.4		(16.0		)
Amortization of Deferred Acquisition Costs	4.6			(8.0	)	5.0			13.3			(10.7	)	14.9
Other Expenses	130.6			(4.9	)	137.4			400.1			(2.7	)	411.1
Total	604.3			(1.3	)	612.3			1,824.4			0.2		1,820.4
Operating Income Before Income Tax and Net Realized Investment Gains and Losses	$	74.5		2.5		$	72.7		$	219.6		(2.5	)	$	225.2
Operating Ratios (% of Premium Income):
Benefit Ratio	84.9		%			85.5		%	84.8		%			84.6		%
Other Expense Ratio	25.5		%			27.0		%	26.0		%			27.0		%
Before-tax Operating Income Ratio	14.5		%			14.3		%	14.2		%			14.8		%
Premium Persistency:
Group Long-term Disability									90.7		%			90.1		%
Group Short-term Disability									88.5		%			90.2		%
Case Persistency:
Group Long-term Disability									88.3		%			88.7		%
Group Short-term Disability									88.1		%			87.8		%

Group disability premium income increased slightly in the third quarter and first nine months of 2012 compared to the same periods of 2011 due primarily to sales growth, stable persistency levels, and slight improvement in premium growth in existing customer accounts. Net investment income was lower in the third quarter and first nine months of 2012 compared to the same periods of 2011 due to a decrease in income from bond call premiums, a decrease in the level of assets supporting this line of business, and a decline in yield on invested assets. Other income for the third quarter and first nine months of 2012 included fees from administrative services products of $20.6 million and $61.3 million, respectively, compared to $20.1 million and $58.5 million in the same periods of 2011.

The overall group disability benefit ratio was favorable in the third quarter of 2012 compared to the third quarter of 2011, but it was slightly unfavorable in the first nine months of 2012 compared to the same period of 2011. Underlying these results were higher claim recoveries for group long-term disability, partially offset by a higher claim prevalence rate and average weekly indemnity for group short-term disability in the third quarter and first nine months of 2012 compared to the prior year periods. Also impacting year-over-year comparisons was a 50 basis point decrease in the claim discount rate during the third quarter of 2012 for group long-term disability new claim incurrals compared to a 25 basis point decrease in the prior year third quarter. Paid claim incidence was generally flat for group long-term disability but was higher for group short-term disability for the first nine months of 2012 relative to the prior year period.

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The deferral of acquisition costs in the third quarter and first nine months of 2012 was higher than the same periods of 2011 due to a higher level of sales. The amortization of deferred acquisition costs in the third quarter and first nine months of 2012 was lower than the same periods of 2011 due primarily to a decrease in amortization related to internal replacement transactions. The other expense ratio was lower in the third quarter and first nine months of 2012 relative to the same periods of 2011 due primarily to higher premium income and our continued focus on operating effectiveness and expense management.

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
	2012			% Change		2011			2012			% Change		2011
Operating Revenue
Premium Income
Group Life	$	297.3		7.1	%	$	277.6		$	885.1		7.2	%	$	825.3
Accidental Death & Dismemberment	29.2			5.4		27.7			86.2			5.6		81.6
Total Premium Income	326.5			6.9		305.3			971.3			7.1		906.9
Net Investment Income	35.9			6.5		33.7			109.0			7.3		101.6
Other Income	0.6			20.0		0.5			1.5			(11.8	)	1.7
Total	363.0			6.9		339.5			1,081.8			7.1		1,010.2
Benefits and Expenses
Benefits and Change in Reserves for Future Benefits	236.0			10.1		214.3			699.9			10.0		636.1
Commissions	26.1			7.9		24.2			78.2			10.0		71.1
Deferral of Acquisition Costs	(4.9		)	14.0		(4.3		)	(15.0		)	9.5		(13.7		)
Amortization of Deferred Acquisition Costs	3.3			(2.9	)	3.4			10.0			(5.7	)	10.6
Other Expenses	46.4			(6.5	)	49.6			142.9			(4.9	)	150.2
Total	306.9			6.9		287.2			916.0			7.2		854.3
Operating Income Before Income Tax and Net Realized Investment Gains and Losses	$	56.1		7.3		$	52.3		$	165.8		6.4		$	155.9
Operating Ratios (% of Premium Income):
Benefit Ratio	72.3		%			70.2		%	72.1		%			70.1		%
Other Expense Ratio	14.2		%			16.2		%	14.7		%			16.6		%
Before-tax Operating Income Ratio	17.2		%			17.1		%	17.1		%			17.2		%
Premium Persistency:
Group Life									91.1		%			87.7		%
Accidental Death & Dismemberment									90.8		%			87.8		%
Case Persistency:
Group Life									88.0		%			88.5		%
Accidental Death & Dismemberment									88.2		%			88.5		%

Premium income for group life and accidental death and dismemberment was higher in the third quarter and first nine months of 2012 compared to the same periods of 2011 due primarily to higher year-to-date sales and favorable premium persistency. Case persistency in the first nine months of 2012 was slightly lower than the same period of 2011, but remains strong. Net investment income was higher in the third quarter and first nine months of 2012 compared to the same periods of 2011 due primarily to an increase in income from bond call premiums, an increase in the level of assets supporting this line of business, and an increase in the level of prepayment income on mortgage-backed securities, partially offset by a decline in yield on invested assets.

The benefit ratio was higher in the third quarter and first nine months of 2012 compared to the same periods of 2011 due primarily to a higher average claim size. Group life paid claim incidence rates were higher in the third quarter of 2012 compared to the third quarter of 2011, but they were lower in the first nine months of 2012 compared to the same period of

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2011. Commissions and the deferral of acquisition costs were higher in the third quarter and first nine months of 2012 compared to the same periods of 2011 due primarily to higher year-to-date sales. The amortization of deferred acquisition costs was generally consistent in the third quarter and first nine months of 2012 when compared to the same periods of 2011. The other expense ratio was lower in the third quarter and first nine months of 2012 relative to the same periods of 2011 due primarily to higher premium income and our continued focus on operating effectiveness and expense management.

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
	2012			% Change		2011			2012			% Change		2011
Operating Revenue
Premium Income
Individual Disability - Recently Issued	$	119.9		2.8	%	$	116.6		$	357.0		2.5	%	$	348.3
Voluntary Benefits	153.0			6.5		143.6			468.9			8.2		433.5
Total Premium Income	272.9			4.9		260.2			825.9			5.6		781.8
Net Investment Income	57.5			7.9		53.3			170.5			8.7		156.8
Other Income	7.3			7.4		6.8			21.6			(2.3	)	22.1
Total	337.7			5.4		320.3			1,018.0			6.0		960.7
Benefits and Expenses
Benefits and Change in Reserves for Future Benefits	140.6			5.7		133.0			414.8			3.6		400.3
Commissions	58.9			6.3		55.4			185.1			9.3		169.4
Deferral of Acquisition Costs	(46.1		)	1.5		(45.4		)	(150.3		)	8.5		(138.5		)
Amortization of Deferred Acquisition Costs	34.4			3.6		33.2			125.8			9.3		115.1
Other Expenses	64.2			7.2		59.9			193.1			3.8		186.0
Total	252.0			6.7		236.1			768.5			4.9		732.3
Operating Income Before Income Tax and Net Realized Investment Gains and Losses	$	85.7		1.8		$	84.2		$	249.5		9.2		$	228.4
Operating Ratios (% of Premium Income):
Benefit Ratios:
Individual Disability - Recently Issued	53.0		%			52.1		%	52.2		%			52.1		%
Voluntary Benefits	50.4		%			50.3		%	48.7		%			50.5		%
Other Expense Ratio	23.5		%			23.0		%	23.4		%			23.8		%
Before-tax Operating Income Ratio	31.4		%			32.4		%	30.2		%			29.2		%
Interest Adjusted Loss Ratio:
Individual Disability - Recently Issued	31.7		%			30.7		%	30.9		%			30.8		%
Premium Persistency:
Individual Disability - Recently Issued									90.8		%			89.8		%
Voluntary Benefits									79.2		%			79.6		%

Premium income was higher in the third quarter and first nine months of 2012 compared to the same periods of 2011 due primarily to continued sales growth. Premium persistency remains strong. Net investment income was higher in the third quarter and first nine months of 2012 compared to the same periods of 2011 due primarily to an increase in the level of assets supporting these lines of business and an increase in the level of prepayment income on mortgage-backed securities, partially offset by a decline in yield on invested assets.

The interest adjusted loss ratio for the individual disability - recently issued line of business in the third quarter of 2012 was slightly higher than the third quarter of 2011 due primarily to lower claim recoveries and in the first nine months of 2012 was generally consistent with the comparable period of 2011.

The benefit ratio for voluntary benefits was slightly higher in the third quarter of 2012 compared to the third quarter of 2011, but was lower in the first nine months of 2012 compared to the same period of 2011. Risk results were favorably impacted by a

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lower average claim size for the cancer and critical illness product, partially offset by higher average claim sizes for our group universal life and voluntary disability products. Also favorably impacting the benefit ratio for the voluntary lines for the first nine months of 2012 relative to the prior year was the release of active life reserves associated with a voluntary benefits large case customer that terminated the existing individual contracts and bought voluntary group coverage during the second quarter of 2012.

Commissions and the deferral of acquisition costs were higher in the third quarter and the first nine months of 2012 compared to the same periods of 2011 due to higher sales. The amortization of deferred acquisition costs was higher in the third quarter and first nine months of 2012 compared to the same periods of 2011 due to unfavorable premium persistency relative to assumptions for certain issue years within certain of our product lines, including the year-to-date impact on persistency from the large case customer that terminated the existing individual contracts and bought voluntary group coverage in the second quarter of 2012. Partially offsetting this increase in amortization was a reduction to amortization due to a more favorable year-over-year impact from the prospective unlocking for favorable mortality experience relative to assumptions for our interest-sensitive voluntary life products.The other expense ratio was slightly lower in first nine months of 2012 relative to the same period of 2011 due primarily to our continued focus on operating effectiveness and expense management, although the ratio was marginally higher in the third quarter of 2012 due to continued investment in these product lines. The other expense ratios were favorably impacted by higher premium income in both the third quarter and first nine months of 2012 compared to the same periods of 2011.

Sales

Shown below are sales results for the Unum US segment.

(in millions of dollars)
	Three Months Ended September 30						Nine Months Ended September 30
	2012		% Change		2011		2012		% Change		2011
Sales by Product
Group Disability, Group Life, and AD&D
Group Long-term Disability	$	23.6	7.3	%	$	22.0	$	95.4	6.2	%	$	89.8
Group Short-term Disability	14.1		13.7		12.4		51.1		15.9		44.1
Group Life	24.5		(2.8	)	25.2		102.7		6.0		96.9
AD&D	2.2		(15.4	)	2.6		10.0		12.4		8.9
Subtotal	64.4		3.5		62.2		259.2		8.1		239.7
Supplemental and Voluntary
Individual Disability - Recently Issued	14.6		13.2		12.9		44.8		10.3		40.6
Voluntary Benefits	43.8		2.6		42.7		175.3		10.5		158.6
Subtotal	58.4		5.0		55.6		220.1		10.5		199.2
Total Sales	$	122.8	4.2		$	117.8	$	479.3	9.2		$	438.9
Sales by Market Sector
Group Disability, Group Life, and AD&D
Core Market (< 2,000 lives)	$	52.3	4.6	%	$	50.0	$	193.8	9.3	%	$	177.3
Large Case Market	12.1		(0.8	)	12.2		65.4		4.8		62.4
Subtotal	64.4		3.5		62.2		259.2		8.1		239.7
Supplemental and Voluntary	58.4		5.0		55.6		220.1		10.5		199.2
Total Sales	$	122.8	4.2		$	117.8	$	479.3	9.2		$	438.9

Unum US sales increased in the third quarter and first nine months of 2012 compared to the same periods of 2011, with growth in each of our major market segments other than a decline in group life and accidental death & dismemberment large case sales during the third quarter of 2012. Sales in our group core market segment were higher in the third quarter and first nine months of 2012 compared to the same periods of 2011, with increases in all product lines within this market segment other than declines in group short-term disability and accidental death and dismemberment during the third quarter of 2012. The number of new accounts added in our group core market segment during the third quarter and first nine months of 2012 was 8.6 percent and 9.4 percent higher, respectively, than the number of new accounts added during the same periods of 2011.

Sales in our group large case market segment were slightly lower in the third quarter of 2012 compared to the same period of 2011, with lower group life and accidental death & dismemberment sales mostly offset by higher group short-term disability

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sales. Sales in our large case market segment were higher in the first nine months of 2012 compared to the same period of 2011 due to higher group short-term disability and group life and accidental death and dismemberment sales, partially offset by a decline in group long-term disability sales. Our sales mix of group products in the first nine months of 2012 was approximately 75 percent core market and 25 percent large case market.

Sales of voluntary benefits were higher in the third quarter and first nine months of 2012 compared to the same periods of 2011, with higher sales from both new and existing customers. The number of new accounts added in the voluntary benefits product line was 12.5 percent and 7.7 percent lower in the third quarter and first nine months of 2012, respectively, than the number of new accounts added during the same periods of 2011. Sales in our individual disability - recently issued line of business, which are primarily concentrated in the multi-life market, were higher in the third quarter and first nine months of 2012 compared to the same periods of 2011 primarily due to higher sales to existing customers.

We believe that the group core market and voluntary benefits market, which combined together were approximately 77 percent of our Unum US sales for the first nine months of 2012 and grew 9.9 percent relative to the first nine months of 2011, represent significant growth opportunities. We will also seek disciplined and opportunistic growth, generally at the market growth rate, in the group large case and individual disability markets. While in the short-term we expect economic trends to continue to pressure our sales growth, we believe we are well positioned for economic recovery.

Segment Outlook

Although we experienced premium and sales growth during the first nine months of 2012, we believe that premium and sales growth, particularly growth in existing customer accounts, will continue to be pressured by the ongoing high levels of unemployment and the competitive environment. Opportunities for further premium and sales growth are expected to re-emerge as the economy improves and employment growth accelerates. We expect some volatility in net investment income to continue as a result of fluctuations in bond calls and other types of miscellaneous net investment income. We intend to continue to manage our expense levels relative to premium levels through operating effectiveness and performance management.

Certain risks and uncertainties are inherent in the disability insurance business. Components of claims experience, such as incidence and recovery rates, may be worse than we expect. Disability claim incidence and claim recovery rates may be influenced by, among other factors, the rate of unemployment and consumer confidence. Within the group disability market, pricing and renewal actions can be taken to react to higher claim rates or lower discount rates, but these actions take time to implement, and there is a risk that the market will not sustain increased prices. In addition, changes in economic and external conditions may not manifest themselves in claims experience for an extended period of time. The current economic conditions may lead to a higher rate of claim incidence, lower levels of claim recoveries, or lower claim discount rates. We have previously taken steps to improve our risk profile, including reducing our exposure to volatile business segments through diversification by market size, product segment, and industry segment. We believe our claims management organization is positioned for stable and sustainable performance levels. Claim incidence levels may fluctuate due to the normal volatility that occurs in group disability business or may be related to economic conditions. We began initiating price increases for our group disability products during the first quarter of 2012 as a result of the continued low interest rate environment and the aging of insureds. We continuously monitor key indicators to assess our risks and attempt to adjust our business plans accordingly.

We believe our Unum US growth strategy is sound and that we will be able to leverage the capabilities, products, and relationships and reputation we have built to deliver growth as the benefits market stabilizes. We continue to see future growth opportunity based on employee choice, defined employer funding, superior service, and effective communication. We intend to maintain our discipline and will continue (i) directing the majority of our efforts on capturing opportunities emerging in our core group and voluntary markets to grow them at above-market rates, (ii) focusing on margins in large case group insurance, while leveraging core market, voluntary, and other shorter-term investments to grow at market rates, and (iii) seeking opportunities to improve margins and return in our supplemental lines of business. We believe we are well positioned strategically in our markets and that opportunities for continued disciplined growth exist in our group core market segment and in the voluntary markets. While the current economic conditions have impacted our ability to grow premium income and will continue to do so until we return to a more normal economic environment, we expect to continue to achieve marginal year-over-year growth in our premium income during the remainder of 2012 and into 2013. We anticipate that the benefit ratio for our group disability product line for 2012 will generally be consistent with the level of 2011, depending on claim incidence rates and claim discount rates. We think future profit margin improvement is achievable, driven primarily by our continued product mix shift and expense efficiencies as our claims performance gradually flattens.

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Unum UK Segment

The Unum UK segment includes insurance for group long-term disability, group life, and supplemental and voluntary lines of business. The supplemental and voluntary lines of business are comprised of individual disability, critical illness, and voluntary benefits products. Unum UK's products are sold primarily in the United Kingdom through field sales personnel and independent brokers and consultants.

Operating Results

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

(in millions of dollars, except ratios)
	Three Months Ended September 30								Nine Months Ended September 30
	2012			% Change		2011			2012			% Change		2011
Operating Revenue
Premium Income
Group Long-term Disability	$	102.9		(4.1	)%	$	107.3		$	306.5		(3.7	)%	$	318.3
Group Life	56.4			8.3		52.1			164.6			8.6		151.6
Supplemental and Voluntary	15.9			(1.2	)	16.1			48.0			(1.0	)	48.5
Total Premium Income	175.2			(0.2	)	175.5			519.1			0.1		518.4
Net Investment Income	34.8			(19.6	)	43.3			120.5			(13.5	)	139.3
Other Income	—			—		—			0.1			—		0.1
Total	210.0			(4.0	)	218.8			639.7			(2.8	)	657.8
Benefits and Expenses
Benefits and Change in Reserves for Future Benefits	136.2			(1.5	)	138.3			407.7			8.2		376.8
Commissions	11.1			0.9		11.0			31.7			(4.8	)	33.3
Deferral of Acquisition Costs	(2.8		)	(22.2	)	(3.6		)	(9.9		)	(11.6	)	(11.2		)
Amortization of Deferred Acquisition Costs	3.8			(2.6	)	3.9			11.8			2.6		11.5
Other Expenses	34.2			(0.9	)	34.5			102.1			(6.0	)	108.6
Total	182.5			(0.9	)	184.1			543.4			4.7		519.0
Operating Income Before Income Tax and Net Realized Investment Gains and Losses	$	27.5		(20.7	)	$	34.7		$	96.3		(30.6	)	$	138.8
Operating Ratios (% of Premium Income):
Benefit Ratio	77.7		%			78.8		%	78.5		%			72.7		%
Other Expense Ratio	19.5		%			19.7		%	19.7		%			20.9		%
Before-tax Operating Income Ratio	15.7		%			19.8		%	18.6		%			26.8		%
Premium Persistency:
Group Long-term Disability									82.9		%			87.1		%
Group Life									80.3		%			88.7		%
Supplemental and Voluntary									87.0		%			87.8		%

Foreign Currency Translation

The functional currency of Unum UK is the British pound sterling. Unum UK's premium income, net investment income, claims, and expenses are received or paid in pounds, and we hold pound-denominated assets to support Unum UK's pound-denominated policy reserves and liabilities. We translate Unum UK's pound-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 the pound to dollar exchange rate have an effect on Unum UK's reported financial results and our consolidated financial results. In periods when the pound strengthens relative to the preceding period, translating pounds into dollars increases current period results relative to the prior period. In periods when the pound weakens relative to the preceding period, as occurred in the third quarter and first nine months of 2012 compared to the same periods of 2011, translating into dollars decreases current period results relative to the prior periods.

(in millions of pounds, except ratios)
	Three Months Ended September 30								Nine Months Ended September 30
	2012			% Change		2011			2012			% Change		2011
Operating Revenue
Premium Income
Group Long-term Disability	£	65.0		(2.4	)%	£	66.6		£	194.1		(1.5	)%	£	197.1
Group Life	35.7			10.2		32.4			104.3			11.1		93.9
Supplemental and Voluntary	10.1			—		10.1			30.4			1.0		30.1
Total Premium Income	110.8			1.6		109.1			328.8			2.4		321.1
Net Investment Income	22.1			(17.8	)	26.9			76.4			(11.4	)	86.2
Other Income	(0.1		)	—		—			—			(100.0	)	0.1
Total	132.8			(2.4	)	136.0			405.2			(0.5	)	407.4
Benefits and Expenses
Benefits and Change in Reserves for Future Benefits	86.2			0.5		85.8			258.1			10.6		233.3
Commissions	7.0			2.9		6.8			20.1			(2.4	)	20.6
Deferral of Acquisition Costs	(1.8		)	(18.2	)	(2.2		)	(6.3		)	(8.7	)	(6.9		)
Amortization of Deferred Acquisition Costs	2.5			4.2		2.4			7.5			5.6		7.1
Other Expenses	21.6			(0.5	)	21.7			64.7			(4.0	)	67.4
Total	115.5			0.9		114.5			344.1			7.0		321.5
Operating Income Before Income Tax and Net Realized Investment Gains and Losses	£	17.3		(19.5	)	£	21.5		£	61.1		(28.9	)	£	85.9
Weighted Average Pound/Dollar Exchange Rate	1.590					1.608			1.576					1.616

Premium income was higher in the third quarter and first nine months of 2012 compared to the same periods of 2011, although premium growth and persistency continue to be pressured due to the initiation of premium rate increases in our group disability and group life product lines. Group life premium income increased in the third quarter and first nine months of 2012 relative to the same periods of 2011 as a result of higher year-to-date sales and premium rate increases, partially offset by lower premium persistency. Group long-term disability premium income was lower in the third quarter and first nine months of 2012 compared to the same periods of 2011 due to lower persistency which resulted primarily from premium rate increases, partially offset by an increase in premium growth in existing customer accounts. Supplemental and voluntary premium income was generally consistent with the third quarter and first nine months of 2011.

Net investment income declined in the third quarter of 2012 compared to the same period of 2011 due primarily to lower income on index-linked bonds and a decrease in invested asset yields, partially offset by an increase in the level of invested assets supporting this segment. The index-linked bonds support the claim reserves associated with certain of our group policies that provide for inflation-linked increases in benefits. For the first nine months of 2012, net investment income was lower compared to the same period of 2011 due to a decrease in invested asset yields, lower income from bond call premiums, and lower income on index-linked bonds, partially offset by an increase in the level of invested assets.

The benefit ratio was lower in the third quarter of 2012, but was higher in the first nine months of 2012, compared to the same periods of 2011. Although claim recoveries and incidence levels were improved during the third quarter of 2012 relative to the third quarter of 2011, claim recoveries and incidence levels were less favorable during the first nine months of 2012 compared to the same period of 2011. Group life risk results were unfavorable during the third quarter and first nine months of 2012 compared to the same periods of 2011 due to a higher average claim size and higher claim volumes. Supplemental and voluntary risk results were favorable during the third quarter and first nine months of 2012 compared to the same periods of 2011 due to lower claim incidence rates in the group critical illness and individual disability products.

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The deferral and amortization of acquisition costs, as well as commissions, were generally consistent in the third quarter and first nine months of 2012 compared to the same periods of 2011. The other expense ratio was lower in the third quarter and first nine months of 2012 compared to the same periods of 2011 due primarily to expense management initiatives and higher premium income.

Sales

Shown below are sales results in dollars and in pounds for the Unum UK segment.

(in millions)
	Three Months Ended September 30						Nine Months Ended September 30
	2012		% Change		2011		2012		% Change		2011
Group Long-term Disability	$	10.4	5.1	%	$	9.9	$	35.1	14.3	%	$	30.7
Group Life	5.6		(37.8	)	9.0		32.7		28.2		25.5
Supplemental and Voluntary	1.0		(58.3	)	2.4		4.0		(37.5	)	6.4
Total Sales	$	17.0	(20.2	)	$	21.3	$	71.8	14.7		$	62.6
Group Long-term Disability	£	6.5	6.6	%	£	6.1	£	22.2	16.8	%	£	19.0
Group Life	3.5		(38.6	)	5.7		20.8		31.6		15.8
Supplemental and Voluntary	0.7		(53.3	)	1.5		2.6		(35.0	)	4.0
Total Sales	£	10.7	(19.5	)	£	13.3	£	45.6	17.5		£	38.8

Sales in Unum UK's group long-term disability product line were higher in the third quarter and first nine months of 2012 compared to the same periods of 2011 due to higher sales in both the core market, which we define for Unum UK as employee groups with fewer than 500 lives, and in the large case market, partially offset by lower sales to existing customers. Group life sales were lower in the third quarter of 2012 compared to the same period of 2011 due to our discontinuance of new sales of certain of our group life product lines during the third quarter of 2012, lower large case sales, and lower sales to existing customers, partially offset by higher core market sales. Group life sales were higher in the first nine months of 2012 relative to the same period of 2011 due primarily to four large cases with more than 2,000 employees which were sold in the first quarter of 2012, as well as higher core market sales, partially offset by lower sales to existing customers. Supplemental and voluntary sales were lower in the third quarter and first nine months of 2012 compared to the same periods of 2011 due primarily to lower sales in our group critical illness and individual disability product lines.

Segment Outlook

The challenging economic and competitive pricing environment in the U.K. continue to negatively impact Unum UK's premium growth, and we expect this may continue in the near term if current conditions persist. Our sales growth may also continue to be impacted by a prolonged competitive pricing environment in the U.K. The current economic conditions may lead to a higher rate of claim incidence, lower levels of claim recoveries, or lower claim discount rates. We will continue to initiate premium rate increases for our group disability and group life products throughout the remainder of 2012 and during 2013. We continuously monitor key indicators to assess our risks and attempt to adjust our business plans accordingly. Continued fluctuations in the U.S. dollar relative to the British pound sterling impact our reported operating results.

In addition to the macro factors which may impact our results, we are undertaking specific business actions in each of our primary product lines. We are implementing rate increases in our group life business as well as exiting certain group life product lines. We expect group life premium income to decline in the near term as a result of these actions. We anticipate the benefit ratio and profit margin in the fourth quarter of 2012 to be generally consistent with the first nine months of 2012, with premium rate increases resulting in improved profitability, which we expect to emerge over time.

In our group disability business, we continue to have a cautious outlook for growth given the current environment. We anticipate returning to more normal levels of premium growth as our rate increases are placed in the market, persistency remains stable, and sales to new and existing customers expand with the market. In addition, we continue to focus on new market opportunities by raising awareness of the need for income protection. Expanding group disability market penetration remains a significant opportunity and priority in the U.K.

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Colonial Life Segment

The Colonial Life segment includes insurance for accident, sickness, and disability products, life products, and cancer and critical illness products issued primarily by Colonial Life & Accident Insurance Company and marketed to employees at the workplace through an independent contractor agency 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
	2012			% Change		2011			2012			% Change		2011
Operating Revenue
Premium Income
Accident, Sickness, and Disability	$	181.8		4.3	%	$	174.3		$	541.8		4.3	%	$	519.7
Life	52.2			11.1		47.0			156.3			11.6		140.0
Cancer and Critical Illness	65.4			4.8		62.4			194.5			4.3		186.4
Total Premium Income	299.4			5.5		283.7			892.6			5.5		846.1
Net Investment Income	33.9			4.3		32.5			103.5			3.9		99.6
Other Income	—			(100.0	)	0.1			0.2			(50.0	)	0.4
Total	333.3			5.4		316.3			996.3			5.3		946.1
Benefits and Expenses
Benefits and Change in Reserves for Future Benefits	158.5			6.3		149.1			468.7			7.1		437.5
Commissions	64.0			3.6		61.8			191.2			4.2		183.5
Deferral of Acquisition Costs	(51.6		)	2.0		(50.6		)	(154.9		)	1.4		(152.7		)
Amortization of Deferred Acquisition Costs	40.9			14.6		35.7			124.7			11.8		111.5
Other Expenses	52.8			(1.5	)	53.6			160.6			(0.4	)	161.2
Total	264.6			6.0		249.6			790.3			6.7		741.0
Operating Income Before Income Tax and Net Realized Investment Gains and Losses	$	68.7		3.0		$	66.7		$	206.0		0.4		$	205.1
Operating Ratios (% of Premium Income):
Benefit Ratio	52.9		%			52.6		%	52.5		%			51.7		%
Other Expense Ratio	17.6		%			18.9		%	18.0		%			19.1		%
Before-tax Operating Income Ratio	22.9		%			23.5		%	23.1		%			24.2		%
Persistency:
Accident, Sickness, and Disability									75.3		%			73.7		%
Life									85.2		%			85.3		%
Cancer and Critical Illness									84.3		%			84.0		%

Premium income increased in the third quarter and first nine months of 2012 relative to the same periods of 2011 due primarily to prior period sales growth and improved persistency. Net investment income was higher in the third quarter of 2012 compared to the third quarter of 2011 due to growth in the level of invested assets supporting this segment, partially offset by a decline in income from bond call premiums and income from private equity partnership investments. For the first nine months of 2012, investment income was higher compared to the same period of 2011 due to growth in the level of invested assets and an increase in income from private equity partnership investments, partially offset by a decline in income from bond call premiums and a decrease in yield.

The benefit ratio was higher in the third quarter and first nine months of 2012 compared to the same periods of 2011 for voluntary life, partially offset by a slightly lower benefit ratio for the accident, sickness, and disability line of business.  The benefit ratio for the cancer and critical illness line of business was slightly lower in the third quarter of 2012 compared to the third quarter of 2011, but was higher in the first nine months of 2012 compared to the same period of 2011. The increase in the life benefit ratio in both the third quarter and first nine months of 2012 was driven by higher mortality rates in our traditional product line, which can exhibit volatility from period to period.  The benefit ratio decreased in the accident, sickness, and

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disability line of business in the third quarter of 2012 due primarily to favorable claim experience in the sickness product line and in the first nine months of 2012 due to favorable claim experience in the disability product line. The decrease in the cancer and critical illness benefit ratio in the third quarter of 2012 was due primarily to favorable claim experience in the critical illness product line. The cancer and critical illness benefit ratio increased in the first nine months of 2012 due primarily to a higher level of paid claims in the cancer line of business and a higher active life reserve change due to favorable persistency for certain issue years.

Commissions and the deferral of acquisition costs were both higher in the third quarter and first nine months of 2012 compared to the same periods of 2011 due primarily to an increase in costs related to growth in new business premium.The amortization of deferred acquisition costs was higher in the third quarter and first nine months of 2012 compared to the same periods of 2011 due to an increase in the level of the deferred asset as well as a less favorable year-over-year impact from the prospective unlocking for expected future experience relative to assumptions for our interest-sensitive life product. The other expense ratio was lower in the third quarter and first nine months of 2012 compared to the same periods of 2011 due primarily to higher premium income and a continued focus on expense management.

Sales

Shown below are sales results for the Colonial Life segment.

(in millions of dollars)
	Three Months Ended September 30						Nine Months Ended September 30
	2012		% Change		2011		2012		% Change		2011
Accident, Sickness, and Disability	$	51.6	(7.7	)%	$	55.9	$	154.8	(4.1	)%	$	161.5
Life	14.4		—		14.4		44.2		3.5		42.7
Cancer and Critical Illness	12.4		(3.9	)	12.9		36.3		2.8		35.3
Total Sales	$	78.4	(5.8	)	$	83.2	$	235.3	(1.8	)	$	239.5

Colonial Life's sales were lower in the third quarter of 2012 compared to the same period of 2011, with decreases in both new and existing account sales. Commercial market sales in the third quarter of 2012 were lower than the same period of 2011, with a 1.8 percent decrease in the core commercial market segment, which we define as accounts with fewer than 1,000 lives, and a 30.1 percent decrease in the large case commercial market segment. Sales were 7.3 percent lower in the public sector market in the third quarter of 2012 compared to the same period of 2011. The number of new accounts decreased 8.2 percent in the third quarter of 2012 compared to the same period of 2011, and the average new case size was 5.9 percent lower.

Colonial Life's sales were lower in the first nine months of 2012 compared to the same period of 2011, with a decrease in new account sales partially offset by an increase in existing account sales. Commercial market sales in the first nine months of 2012 were slightly lower than the same period of 2011, with a 6.8 percent decrease in large case commercial market segment sales mostly offset by a 0.5 percent increase in the core commercial market segment. Sales were 7.2 percent lower in the public sector market in the first nine months of 2012 compared to the same period of 2011. The number of new accounts decreased 2.5 percent in the first nine months of 2012 compared to the same period of 2011, while the average new case size was 10.7 percent lower.

Segment Outlook

Our premium growth in the first nine months of 2012 was consistent with the level of growth in the same period of 2011. Current economic conditions continue to affect employment growth and buying conditions which, in turn, impact sales and premium growth. As a result of strong persistency, premium growth remains positive, and we expect sales growth to improve in 2013. We expect volatility in net investment income to continue during the remainder of 2012 as a result of fluctuations in bond calls and other types of miscellaneous net investment income. Periods of economic downturns have historically had minimal impact on the risk results of Colonial Life, due primarily to a diversified product portfolio that is designed with short duration, indemnity benefits.  We believe that strong profit margins will continue, and we expect our overall benefit ratio to be generally consistent with the level of the first nine months of 2012. We continuously monitor key indicators to assess our risks and attempt to adjust our business plans accordingly.

We believe we have a stable business model, with service levels and customer retention that allow us to focus on and deliver premium growth despite the recent marketplace changes and uncertainties. We believe we are well positioned for growth and that opportunities exist to accelerate growth during the next several years by (i) focusing on target market segments, (ii) driving new sales in the public sector market, (iii) growing the reach and effectiveness of our distribution, and (iv) effectively serving our customers.

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Closed Block Segment

The Closed Block segment consists of our closed individual disability and individual and group long-term care lines of business, as well as certain other insurance products. The individual disability line of business generally consists of those policies in-force before the substantial changes in product offerings, pricing, distribution, and underwriting, which generally occurred during the period 1994 through 1998. Long-term care includes group long-term care, which we announced in February 2012 that we would discontinue selling, and individual long-term care, which we discontinued selling in 2009. The other insurance products line of business consists of certain other products no longer actively marketed, including individual life and corporate-owned life insurance, reinsurance pools and management operations, group pension, health insurance, and individual annuities.

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
	2012			% Change		2011			2012			% Change		2011
Operating Revenue
Premium Income
Individual Disability	$	183.1		(6.8	)%	$	196.4		$	554.9		(6.7	)%	$	595.0
Long-term Care	159.4			4.8		152.1			471.5			4.0		453.5
All Other	0.4			144.4		(0.9		)	1.9			N.M.		(0.3		)
Total Premium Income	342.9			(1.4	)	347.6			1,028.3			(1.9	)	1,048.2
Net Investment Income	307.3			2.4		300.1			913.4			2.8		888.9
Other Income	26.4			—		26.4			78.9			(2.1	)	80.6
Total	676.6			0.4		674.1			2,020.6			0.1		2,017.7
Benefits and Expenses
Benefits and Change in Reserves for Future Benefits	580.5			2.6		565.9			1,734.3			2.7		1,687.9
Commissions	28.2			—		28.2			84.5			(0.8	)	85.2
Interest and Debt Expense	2.5			(3.8	)	2.6			7.9			—		7.9
Deferral of Acquisition Costs	—			(100.0	)	(0.9		)	—			(100.0	)	(2.6		)
Amortization of Deferred Acquisition Costs	—			(100.0	)	3.1			—			(100.0	)	10.3
Other Expenses	39.8			(10.4	)	44.4			127.2			(6.4	)	135.9
Total	651.0			1.2		643.3			1,953.9			1.5		1,924.6
Operating Income Before Income Tax and Net Realized Investment Gains and Losses	$	25.6		(16.9	)	$	30.8		$	66.7		(28.4	)	$	93.1
Interest Adjusted Loss Ratios:
Individual Disability	82.5		%			84.9		%	82.7		%			84.6		%
Long-term Care	91.3		%			86.0		%	90.1		%			84.4		%
Operating Ratios (% of Premium Income):
Other Expense Ratio	11.6		%			12.8		%	12.4		%			13.0		%
Before-tax Operating Income Ratio	7.5		%			8.9		%	6.5		%			8.9		%
Premium Persistency:
Individual Disability									92.6		%			92.6		%
Long-term Care									95.7		%			95.7		%

N.M.: Not a Meaningful Percentage

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Individual Disability

The decrease in premium income in the third quarter and first nine months of 2012 compared to the same periods of 2011 is due to the run-off of this closed line of business driven by expected policy terminations and maturities. Net investment income was lower in the third quarter and first nine months of 2012 compared to the same periods of 2011 due to a lower level of assets supporting this closed line of business and a decrease in income from bond call premiums.

Other income, which includes the underlying results of certain blocks of reinsured business and the net investment income of portfolios held by those ceding companies to support the block we have reinsured, was lower in the third quarter and first nine months of 2012 compared to the same periods of 2011 due to lower investment income in the portfolios held by the ceding companies.

Risk results for the third quarter and first nine months of 2012 were favorable relative to the comparable periods of 2011 due primarily to higher claim recovery rates and a decrease in reserves for existing claims. Interest and debt expense in the third quarter and first nine months of 2012 was generally consistent with the same periods of 2011, as principal repayments on the amount of outstanding debt issued by Northwind Holdings were offset by an increase in floating-rate interest on this debt.The other expense ratio was lower in the third quarter and first nine months of 2012 relative to the same periods of 2011 due primarily to lower claim litigation costs and our continued focus on operating effectiveness and expense management.

Long-term Care

The increase in premium income for the third quarter and first nine months of 2012 relative to the comparable periods of 2011 was driven by continued strong levels of premium persistency, issuances of group long-term care policies, and the implementation of rate increases on certain of our individual long-term care policies. Although we announced in the first quarter of 2012 that we would no longer sell group long-term care, we had group cases which were already in the quoting and/or underwriting process at the time of our announcement and for which we have now issued the policies. Net investment income was higher in the third quarter and first nine months of 2012 compared to the same periods of 2011 due primarily to an increase in the level of assets supporting this line of business and an increase in income from bond call premiums.

Risk results in the third quarter and first nine months of 2012 were unfavorable relative to the comparable periods of 2011 due primarily to higher claim incidence rates and a higher average new claim size.

We had no amortization of deferred acquisition costs in the third quarter and first nine months of 2012 due to the impairment charge recognized at December 31, 2011. The other expense ratio was lower in the third quarter and first nine months of 2012 relative to the same periods of 2011 due primarily to higher premium income and a decrease in selling and underwriting costs due to our discontinuance of the sale of group long-term care in 2012.

We continue to file requests with various state insurance departments for rate increases on certain of our individual long-term care policies. The rate increases reflect current interest rates and claim experience, higher expected future claims, persistency, and other factors related to pricing individual long-term care coverage.  In states for which a rate increase is submitted and approved, customers are also given options for coverage changes or other approaches that might fit their current financial and insurance needs. During 2012, we filed for rate increases on certain of our policy forms within our group product line and rate increases on some additional policy forms within our individual product line.

All Other

Operating income for our other insurance products decreased in the third quarter and first nine months of 2012 compared to the same periods of 2011 due primarily to lower net investment income driven by a lower level of assets supporting these closed lines of business and unfavorable mortality.

Segment Outlook

We expect that this segment may experience volatility in net investment income due to the variability in interest rates on floating rate assets and also due to volatility of bond call premiums relative to historical levels. A portion of the volatility in interest income will be offset by commensurate changes in the interest expense on our individual disability floating rate debt.

We expect that operating revenue and income for this segment will continue to decline over time as these closed blocks of business wind down, although we do expect additional premium income associated with long-term care rate increases. We also expect a small amount of new group long-term care business to continue to be issued where we are required to do so under the terms of existing group policies. Profitability of our long-tailed products is affected by claims experience related to mortality

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and morbidity, investment returns, and persistency.  We believe that the interest adjusted loss ratios for the individual disability and long-term care lines of business will be relatively flat over the long term, but these product lines may experience quarterly volatility, particularly in the near-term for our long-term care product lines as our claim block matures. Claim resolution rates, which measure the resolution of claims from recovery, deaths, settlements, and benefit expirations, are very sensitive to operational and environmental changes 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, interest rates, mortality, morbidity, and persistency, could result in a material impact on our reserve levels, including adjustments to reserves previously established under loss recognition. 

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Corporate Segment

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

Operating Results

(in millions of dollars)
	Three Months Ended September 30								Nine Months Ended September 30
	2012			% Change		2011			2012			% Change		2011
Operating Revenue
Net Investment Income	$	6.9		(48.1	)%	$	13.3		$	23.0		(48.4	)%	$	44.6
Other Income	0.4			(81.8	)	2.2			2.2			(21.4	)	2.8
Total	7.3			(52.9	)	15.5			25.2			(46.8	)	47.4
Expenses
Interest and Debt Expense	33.9			5.3		32.2			98.6			(0.8	)	99.4
Other Expenses	0.8			(80.5	)	4.1			0.5			(93.4	)	7.6
Total	34.7			(4.4	)	36.3			99.1			(7.4	)	107.0
Operating Loss Before Non-operating Retirement-related Loss, Income Tax, and Net Realized Investment Gains and Losses	$	(27.4	)	(31.7	)	$	(20.8	)	$	(73.9	)	(24.0	)	$	(59.6	)

Net investment income was lower in the third quarter and first nine months of 2012 compared to the same periods of 2011 due to lower asset levels, a lower proportion of assets invested at long-term interest rates, and a decrease in investment income attributable to tax-credit partnerships. The negative impact on net investment income and operating income by segment due to the higher level of investment in tax-credit partnerships is offset by a lower income tax rate due to the tax benefits recognized as a result of these investments.

Interest and debt expense during the third quarter and first nine months of 2012 increased due to the issuance of $250.0 million of 5.75% senior notes in August 2012. Interest and debt expense decreased during 2012 as a result of the maturity of $225.1 million of 7.625% senior notes in March 2011. Interest and debt expense was also lower during the first nine months of 2012, as compared to the same period of 2011, due to a lower year-to-date rate of interest on our 5.625% notes that mature in 2020, a portion of which we effectively converted into floating rate debt through the use of an interest rate swap entered into during the third quarter of 2012. Other expenses decreased in the third quarter and first nine months of 2012 compared to the same periods of 2011 due primarily to decreases in expense accruals. Partially offsetting the decrease in other expenses for the first nine months of 2012 was an impairment of a long-lived fixed asset which was recognized during the second quarter of 2012.

Segment Outlook

We expect the quality of our investment portfolio to remain strong. We are currently holding capital at our insurance subsidiaries and holding companies at levels that exceed our long-term requirements. We expect to continue to generate excess capital on an annual basis through our statutory earnings. While we intend to maintain our disciplined approach to risk management, we believe we are well positioned with substantial flexibility to preserve our capital strength and at the same time explore opportunities to deploy the excess capital that is generated each period.

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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 expected 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. Changes in interest rates may affect the amount and timing of cash flows.

We actively manage our asset and liability cash flow match and our asset and liability duration match to limit interest rate risk. We may redistribute investments among our different lines of business, 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 also 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 the most appropriate investment strategy as well as to limit the risk of disadvantageous outcomes. We use this analysis in determining hedging strategies and utilizing derivative financial instruments for managing 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, including credit and interest rate management, has positioned us well and generally reduced the volatility in our results.

We have no exposure to subprime mortgages, "Alt-A" loans, or collateralized debt obligations in our investment portfolios. We have no direct exposure to sovereign debt of certain countries in the European Union, specifically Greece, Ireland, Italy, Portugal, and Spain. At September 30, 2012, we had minimal exposure to investments for which the payment of interest and principal is guaranteed under a financial guaranty insurance policy, and all such securities are rated investment-grade absent the guaranty insurance policy. At September 30, 2012, we held $220.2 million fair value ($217.8 million amortized cost) of perpetual debentures, or "hybrid" securities, that generally have no fixed maturity date. Interest on these securities due on any payment date may be deferred by the issuer. The interest payments are generally deferrable only to the extent that the issuer has suspended dividends or other distributions or payments to any of its shareholders or any other perpetual debt instrument.

For information on our valuation of investments and our formal investment policy, including our overall quality and diversification objectives, see "Critical Accounting Estimates" and "Investments" in Part II, Item 7 of our annual report on Form 10-K for the year ended December 31, 2011.

Investment Results

Net investment income decreased 1.6 percent and 0.7 percent in the third quarter and first nine months of 2012, respectively, relative to the same periods of 2011 due primarily to lower income from bond call premiums, lower income on index-linked bonds which support the claim reserves associated with certain of our Unum UK group policies that provide for inflation-linked increases, and a decline in the yield on invested assets, partially offset by higher asset levels and higher income from prepayments on mortgage-backed securities.

The duration weighted book yield on the fixed income securities in our investment portfolio was 6.54 percent as of September 30, 2012, compared to a yield of 6.67 percent as of December 31, 2011. As previously stated, we actively manage our asset and liability cash flow match and our asset and liability duration match with the objective of reducing interest rate risk. Duration is a measure of the percentage change in the fair values of assets and liabilities for a given change in interest rates. Cash flows from the in-force asset and liability portfolios are projected at current interest rate levels and also 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.

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To assess the impact of a duration mismatch, we measure the potential changes in estimated fair value based on a hypothetical change in interest rates to quantify a dollar value change. 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 more 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 rates embedded in the reserves.

Realized investment gains and losses, before tax, are as follows:

(in millions of dollars)
	Three Months Ended September 30						Nine Months Ended September 30
	2012			2011			2012			2011
Fixed Maturity Securities
Gross Gains on Sales	$	4.6		$	14.8		$	14.0		$	33.0
Gross Losses on Sales	(2.3		)	(5.4		)	(9.0		)	(22.1		)
Other-Than-Temporary Impairment Loss	—			(1.2		)	—			(4.2		)
Mortgage Loans and Other Invested Assets
Gross Gains on Sales	2.3			1.6			2.3			7.1
Gross Losses on Sales	—			—			—			(0.2		)
Impairment Loss	(1.3		)	(0.4		)	(1.8		)	(0.4		)
Embedded Derivative in Modified Coinsurance Arrangement	19.7			(33.7		)	28.7			(24.4		)
Foreign Currency Transactions	(1.7		)	0.4			(2.6		)	(1.1		)
Net Realized Investment Gain (Loss)	$	21.3		$	(23.9	)	$	31.6		$	(12.3	)

We had no individual realized investment losses of $10.0 million or greater from the sale of fixed-maturity securities during the third quarter or first nine months of 2012 or 2011.

We report changes in the fair value of an embedded derivative in a modified coinsurance arrangement as realized investment gains and losses, as required under the provisions of GAAP. GAAP requires us to include in our realized 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, and any accumulated embedded derivative gain or loss reduces to zero over time as the reinsured business winds down. We therefore view the effect of realized gains and losses recognized for this embedded derivative as a reporting requirement that will not result in a permanent change in assets or stockholders' equity.

The change in fair value of this embedded derivative recognized as a realized gain or loss during the third quarter or first nine months of 2012 and 2011 resulted primarily from a change in credit spreads in the overall investment market. The fair value of this embedded derivative was $(107.0) million at September 30, 2012, compared to $(135.7) million at December 31, 2011, and is reported in other liabilities in our consolidated balance sheets.

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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, 2012

(in millions of dollars)
Classification	Fair Value		Net Unrealized Gain		Fair Value of Fixed Maturity Securities with Gross Unrealized Loss		Gross Unrealized Loss		Fair Value of Fixed Maturity Securities with Gross Unrealized Gain		Gross Unrealized Gain
Basic Industry	$	2,653.6	$	308.7	$	186.9	$	16.2	$	2,466.7	$	324.9
Capital Goods	3,843.9		561.9		135.1		7.5		3,708.8		569.4
Communications	3,080.9		548.2		106.6		8.6		2,974.3		556.8
Consumer Cyclical	1,278.1		177.0		85.5		6.5		1,192.6		183.5
Consumer Non-Cyclical	5,854.2		1,039.6		68.8		2.7		5,785.4		1,042.3
Energy (Oil & Gas)	3,916.0		765.4		44.5		1.4		3,871.5		766.8
Financial Institutions	3,644.1		378.6		208.1		17.2		3,436.0		395.8
Mortgage/Asset-Backed	2,423.6		318.3		8.3		0.5		2,415.3		318.8
Sovereigns	1,435.0		225.4		—		—		1,435.0		225.4
Technology	1,017.3		151.3		28.2		0.1		989.1		151.4
Transportation	1,396.3		272.4		—		—		1,396.3		272.4
U.S. Government Agencies and Municipalities	3,109.0		653.8		50.5		8.0		3,058.5		661.8
Utilities	11,053.8		1,880.9		269.5		22.3		10,784.3		1,903.2
Redeemable Preferred Stocks	38.9		5.9		—		—		38.9		5.9
Total	$	44,744.7	$	7,287.4	$	1,192.0	$	91.0	$	43,552.7	$	7,378.4

The following two tables show the length of time our investment-grade and below-investment-grade fixed maturity securities had been in a gross unrealized loss position as of September 30, 2012 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, 2012.

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Unrealized Loss on Investment-Grade Fixed Maturity Securities

Length of Time in Unrealized Loss Position

(in millions of dollars)
	2012						2011
	September 30		June 30		March 31		December 31		September 30
Fair Value < 100% >= 70% of Amortized Cost
<= 90 days	$	0.7	$	11.2	$	15.6	$	12.8	$	38.9
> 90 <= 180 days	0.4		4.1		7.1		34.3		14.1
> 180 <= 270 days	0.9		0.7		9.6		8.0		—
> 270 days <= 1 year	—		7.8		2.2		—		24.6
> 1 year <= 2 years	9.3		31.9		19.3		33.7		11.4
> 2 years <= 3 years	8.9		0.2		0.2		1.1		1.8
> 3 years	17.8		28.8		34.0		40.9		28.1
Sub-total	38.0		84.7		88.0		130.8		118.9
Fair Value < 70% >= 40% of Amortized Cost
> 3 years	—		—		—		9.5		27.1
Sub-total	—		—		—		9.5		27.1
Total	$	38.0	$	84.7	$	88.0	$	140.3	$	146.0

Unrealized Loss on Below-Investment-Grade Fixed Maturity Securities

Length of Time in Unrealized Loss Position

(in millions of dollars)
	2012						2011
	September 30		June 30		March 31		December 31		September 30
Fair Value < 100% >= 70% of Amortized Cost
<= 90 days	$	4.1	$	7.6	$	4.8	$	3.3	$	39.5
> 90 <= 180 days	3.9		6.2		9.5		11.9		15.6
> 180 <= 270 days	5.4		4.4		7.9		8.5		1.6
> 270 days <= 1 year	3.9		3.0		6.5		0.7		6.7
> 1 year <= 2 years	4.5		17.8		15.7		13.0		13.7
> 2 years <= 3 years	9.4		8.2		—		—		0.3
> 3 years	20.7		35.6		24.6		37.3		35.2
Sub-total	51.9		82.8		69.0		74.7		112.6
Fair Value < 70% >= 40% of Amortized Cost
> 180 <= 270 days	—		—		—		—		0.7
> 1 year <= 2 years	—		—		—		5.0		—
> 3 years	1.1		0.3		0.4		2.2		10.3
Sub-total	1.1		0.3		0.4		7.2		11.0
Total	$	53.0	$	83.1	$	69.4	$	81.9	$	123.6

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We held no securities at September 30, 2012 with a gross unrealized loss of $10.0 million or greater.

At September 30, 2012, our mortgage/asset-backed securities had an average life of 3.86 years, effective duration of 3.47 years, and a weighted average credit rating of Aa1. The mortgage/asset-backed securities are valued on a monthly basis using valuations supplied by the brokerage firms that are dealers in these securities as well as independent pricing services. One of the risks involved in investing in mortgage/asset-backed securities is the uncertainty of the timing of cash flows from the underlying loans due to prepayment of principal with the possibility of reinvesting the funds in a lower interest rate environment. We use models which incorporate economic variables and possible future interest rate scenarios to predict future prepayment rates. The timing of prepayment cash flows may also cause volatility in our recognition of investment income. We recognize investment income on these securities using a constant effective yield based on projected prepayments of the underlying loans and the estimated economic life of the securities.  Actual prepayment experience is reviewed periodically, and effective yields are recalculated when differences arise between prepayments originally projected and the actual prepayments received and currently projected.  The effective yield is recalculated on a retrospective basis, and the adjustment is reflected in net investment income.

We have not invested in mortgage-backed derivatives, such as interest-only, principal-only, or residuals, where market values can be highly volatile relative to changes in interest rates. The credit quality of our mortgage-backed securities portfolio has not been negatively impacted by the issues in the market concerning subprime mortgage loans. The change in value of our mortgage-backed securities portfolio has moved in line with that of prime agency-backed mortgage-backed securities.

As of September 30, 2012, the amortized cost and fair value of our below-investment-grade fixed maturity securities was $3,019.0 million and $3,150.9 million, respectively. Below-investment-grade securities are inherently more risky than investment-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.

Investments in Issuers in Certain European Countries and Other Countries with Risk of Sovereign Default

Our investments 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 approved 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 continually evaluate our foreign investment risk exposure, including that within certain countries in the European Union, specifically Greece, Ireland, Italy, Portugal, and Spain. Our monitoring is heightened for investments in these specific countries due to our concerns over the current economic and political environments as well as the banking crisis, and we believe these investments are more vulnerable to potential credit problems.  We have neither direct nor indirect exposure to sovereign debt of any other countries for which we believe there is a heightened risk of sovereign default.

We do not have 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 have no direct exposure to sovereign debt of these countries and have not used credit derivatives to hedge our exposure or to sell credit protection.

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European Fixed Maturity Securities Exposure - By Country

As of September 30, 2012

(in millions of dollars)
	Fair Value		Amortized Cost
Greece	$	54.0	$	50.2
Ireland	64.0		66.3
Italy	204.6		204.7
Portugal	83.7		80.3
Spain	227.7		222.8
Total	$	634.0	$	624.3

We have no unfunded commitments to issuers domiciled in these countries. Further discussion on our exposure to each country is as follows:

Greece

We have no direct exposure to Greek financial institutions.  Our singular holding domiciled in Greece is a geographically diversified company, generates less than 10 percent of its revenue from Greece, and was rated investment-grade as of September 30, 2012. The company aggregates cash and manages its debt payments outside the country in which it is domiciled, which we believe enables the company to place low reliance on the banking system of Greece. The company intends to change its domicile to Switzerland, pending required shareholder approval. As of September 30, 2012, this company was current on its obligations to us, and we believe it will continue to meet its debt obligations. This security was in an unrealized gain position as of September 30, 2012.

Ireland

We have no direct exposure to Irish financial institutions.  In November 2010, Ireland received a support package valued at €85 billion from the International Monetary Fund/European Union based on its plan of recovery. Thus far, Ireland appears committed to fiscal consolidation.  However, we believe there are risks associated with the austerity and recessionary pressures.  As of September 30, 2012, all of our Irish investments werecurrent on their obligations to us, and we believe they will continue to meet their debt obligations.  In addition, we have the intent to hold these investments to recovery in value. As a result, we did not recognize any other-than-temporary impairment losses on these investments as of September 30, 2012.

Italy

We have no direct exposure to Italian financial institutions.  We believe there are risks associated with the debt sustainability of Italy given the high refinancing rates and recessionary pressures. As of September 30, 2012, all of our Italian investments were current on their obligations to us, and we believe they will continue to meet their debt obligations.  In addition, we have the intent to hold these investments to recovery in value. As a result, we did not recognize any other-than-temporary impairment losses on these investments as of September 30, 2012.

Portugal

We have no direct exposure to Portuguese financial institutions.  In May 2011, Portugal received a support package valued at €78 billion from the International Monetary Fund/European Union.  We believe there is risk that Portugal will be unable to achieve the deficit reduction targets set out in this loan agreement, and future aid may be required. As of September 30, 2012, our holdings in Portugal consisted of two issuers, both of which were downgraded to below-investment grade during the first and second quarters of 2012. These companies were current on their obligations to us, and we believe they will continue to meet their debt obligations.  In addition, we have the intent to hold these investments to recovery in value. As a result, we did not recognize any other-than-temporary impairment losses on these investments as of September 30, 2012.

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Spain

We have no direct exposure to Spanish financial institutions, although we do own fixed maturity securities of certain United Kingdom and United States subsidiaries of Spanish financial institutions. It is expected that Spain will receive a rescue package from the Eurozone in order to strengthen its financial institutions. Our holdings are not part of the rescue package, but we believe there are risks associated with Spain's high unemployment, large budget deficit, banking sector problems, and recessionary pressures. All of our Spanish domiciled securities were rated investment-grade as of September 30, 2012 and were current on their obligations to us. We believe they will continue to have the ability to meet their debt obligations. In addition, we have the intent to hold these investments to recovery in value. As a result, we did not recognize any other-than-temporary impairment losses on these investments as of September 30, 2012.

Risk Management

While we have no direct sovereign holdings in the aforementioned countries, we have performed comprehensive stress testing and scenario analyses on all of our corporate holdings of issuers domiciled in these countries. We have performed stress tests under a number of scenarios including deep recession, liquidity crisis, and currency redenomination with significant devaluation. We continue to closely monitor this situation.

Potential risks for these corporate holdings include a lack of access to credit in their countries of domicile and redenomination risk as it pertains to their outstanding liabilities. Under either of these scenarios, we believe the risk is largely mitigated because our holdings in these countries are non-financial and operate in defensive industries that provide essential services. Most are market leaders with access to diverse, global capital markets. Current developments regarding ratings downgrades, bailout packages, or higher sovereign interest rates have not had a material impact on our financial condition or results of operations.

Mortgage Loans

Our mortgage loan portfolio was $1,665.2 million and $1,612.3 million on an amortized cost basis at September 30, 2012 and December 31, 2011, respectively. Our mortgage loan portfolio is comprised entirely of commercial mortgage loans. We believe our mortgage loan portfolio is well diversified geographically and among property types. The incidence of problem mortgage loans and foreclosure activity continues to be low. Due to conservative underwriting, we expect the level of problem loans to remain low relative to the industry.

We held three mortgage loans at September 30, 2012 and two at December 31, 2011 which were considered impaired and were carried at the estimated net realizable values of $21.6 million and $22.5 million, respectively, net of valuation allowances of $2.8 million and $1.5 million, respectively.

Derivative Financial Instruments

We use derivative financial instruments primarily to manage reinvestment risk, duration, and currency risk. Historically, we have utilized current and forward interest rate swaps and options on forward interest rate swaps, current and forward currency swaps, forward treasury locks, currency forward contracts, and forward contracts on specific fixed income securities. Our current credit exposure on derivatives, which is limited to the value of those contracts in a net gain position less collateral held, was $9.8 million at September 30, 2012. We held cash collateral of $15.3 million from our counterparties at September 30, 2012. The carrying value of fixed maturity securities posted as collateral to our counterparties was $129.4 million at September 30, 2012. We had no cash posted as collateral to our counterparties at September 30, 2012. We believe that our credit risk is mitigated by our use of multiple counterparties, all of which have a median credit rating of A3 or better, and by our use of cross-collateralization agreements.

Other

Our exposure to non-current investments, defined as foreclosed real estate and invested assets which are delinquent as to interest and/or principal payments, totaled $59.0 million and $58.6 million on a fair value basis at September 30, 2012 and December 31, 2011, respectively.

See Notes 4 and 5 of the "Notes to Consolidated Financial Statements" contained herein in Item 1 for further discussion of our investments and our derivative financial instruments.

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Liquidity and Capital Resources

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 an additional source 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 consistent, even during cycles of economic downturns, which serves to minimize liquidity risk.

We have met all minimum pension funding requirements set forth by ERISA. We made a voluntary contribution of $53.0 million to our U.S. qualified defined benefit plan during the second quarter of 2012. We have estimated our future funding requirements under the Pension Protection Act of 2006 and do not believe that the funding requirements will cause a material adverse effect on our liquidity.

We also contribute to our U.K. pension plan sufficient to meet the minimum funding requirement under U.K. legislation. We contributed £2.0 million during the first nine months of 2012 and expect to make additional contributions of approximately £0.6 million during the fourth quarter of 2012.

In August 2012, we issued $250.0 million of senior notes. These notes, due in 2042, bear interest at a fixed rate of 5.75% and are payable semi-annually. The net proceeds are expected to be used for general corporate purposes.

In May 2010, our board of directors authorized the repurchase of up to $500.0 million of Unum Group's common stock, with the pace of repurchase activity to depend upon various factors such as the level of available cash, alternative uses for cash, and our stock price. The $500.0 million share repurchase program had an expiration date of May 2011. In February 2011, our board of directors authorized the repurchase of up to $1.0 billion of Unum Group's common stock, in addition to the amount remaining to be repurchased under the $500.0 million authorization. The $1.0 billion share repurchase program had an expiration date of August 2012. In July 2012, our board of directors authorized the repurchase of up to $750.0 million of Unum Group's common stock. The $750.0 million share repurchase program has an expiration date of January 2014 and replaced the previous authorization of $1.0 billion that was scheduled toexpire in August 2012.

During the first quarter of 2011, we repurchased 7.1 million shares, at a cost of $200.0 million, using an accelerated repurchase agreement with a financial counterparty. Under the terms of the repurchase agreement, we received a price adjustment based on the volume weighted-average price of our common stock during the term of the agreement. The price adjustment resulted in the delivery to us of approximately 0.6 million additional shares. In total, we repurchased 7.7 million shares of our common stock under this agreement. The shares repurchased pursuant to the accelerated repurchase agreement completed the $500.0 million repurchase authorization and initiated the $1.0 billion repurchase program. In addition to these repurchases, during 2011 we repurchased an additional 17.7 million shares on the open market at a cost of $419.9 million, for a total repurchase of 25.4 million shares during 2011. During the first nine months of 2012, we repurchased 18.6 million shares on the open market at a cost of $400.5 million. The dollar value of shares remaining under the $1.0 billion repurchase program, prior to its replacement, was $224.7 million. As previously noted, this share repurchase program was superseded and replaced by the $750.0 million share repurchase program authorized in July 2012. The dollar value of shares remaining under the $750.0 million repurchase program was approximately $650.0 million at September 30, 2012.

Cash equivalents and marketable securities held at Unum Group and our other intermediate holding companies are a significant source of liquidity for us and were approximately $762 million and $756 million at September 30, 2012 and December 31, 2011, respectively. The September 30, 2012 balance, of which $137 million was held in certain of our foreign subsidiaries in the U.K., was comprised primarily of commercial paper, fixed maturity securities with a current average maturity of 2.68 years, and various money-market funds.  No significant restrictions exist on our ability to use or access these funds. We currently have no

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intent, nor do we foresee a need, to repatriate funds from our foreign subsidiaries in the U.K. We believe we hold domestic resources sufficient to fund our liquidity requirements for the next 12 months and that our current level of holding company cash and marketable securities can be utilized to mitigate potential losses from defaults. If we repatriate additional funds from our subsidiaries in the U.K., the amounts repatriated would be subject to repatriation tax effects which generally equal the difference in the U.S. tax rate and the U.K. tax rate.

Consolidated Cash Flows

Operating Cash Flows

Net cash provided by operating activities was $953.8 million for the first nine months of 2012, compared to $788.7 million in the same period of 2011. 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 renewals 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 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.  Net cash used by investing activities was $869.9 million for the first nine months of 2012 compared to $141.0 million for the same period of 2011.

Proceeds from sales of available-for-sale securities decreased in the first nine months of 2012 compared to the same period of 2011 because of a lack of suitable available securities in which to reinvest our proceeds due primarily to lower treasury rates and credit spreads. Proceeds from maturities of available-for-sale securities were higher in the first nine months of 2012 compared to the same period of 2011 primarily due to a significant increase in proceeds from bond calls and prepayments on mortgage-backed securities. 

Proceeds from sales and maturities of other investments increased slightly in the first nine months of 2012 compared to the same period of 2011 primarily due to an increase in proceeds from the terminations of derivative contracts within our cash flow hedging programs and an increase in maturities from mortgage loans, partially offset by a decrease in proceeds from private equity partnership distributions.  

Purchases of available-for-sale securities were higher in the first nine months of 2012 compared to the same period of 2011. Funds available for reinvestment increased during the first nine months of 2012 due to the increase in proceeds from maturities, as previously noted.

Net purchases of short-term investments increased in the first nine months of 2012 compared to the same period of 2011 due to the increase in activity within our securities lending program which contributed to an increase in purchases of short-term investments due to the investment of cash collateral received. Additionally, we had net sales of short-term investments in the first nine months of 2011 to provide funding for payment for our debt maturing in March 2011 and to fund our 2011 share repurchases.

Financing Cash Flows

Financing cash flows consist primarily of borrowings and repayments of debt, issuance or repurchase of common stock, and dividends paid to stockholders. Net cash used by financing activities was $146.9 million for the first nine months of 2012, compared to $649.0 million in the same period of 2011.

During the first nine months of 2012 and 2011, the balance outstanding under our securities lending program increased by $146.0 million and $342.4 million, respectively. During the first nine months of 2011, we also made short-term debt repayments of $225.1 million at the maturity date of our senior notes due March 2011.

In August 2012, we received proceeds of $250.0 million, less debt issuance costs of $2.2 million and a debt discount of $1.4 million, from the issuance of $250.0 million of 5.75% senior notes.

During the first nine months of 2012 and 2011, Northwind Holdings made principal payments of $38.1 million and $59.4 million, respectively, on its floating rate, senior secured non-recourse notes, and Tailwind Holdings made principal payments of $7.5 million in each nine month period on its floating rate, senior secured non-recourse notes.

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During the first nine months of 2012 and 2011, we repurchased 18.6 million and 25.4 million shares of Unum Group's common stock, respectively, at a cost of $400.5 million and $619.9 million, respectively.

See "Debt" contained in this Item 2 for further information.

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 United States, 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 realized investment gains and losses, of the preceding year. The payment of dividends to a parent company from its insurance subsidiaries is generally further limited to the amount of unassigned statutory surplus.

Unum Group and/or certain of its intermediate holding company subsidiaries may also receive dividends from its United Kingdom-based affiliate, Unum Limited, subject to applicable insurance company regulations and capital guidance in the United Kingdom.

Northwind Holdings' and Tailwind Holdings' ability to meet their debt payment obligations is dependent upon the receipt of dividends from Northwind Reinsurance Company (Northwind Re) and Tailwind Reinsurance Company (Tailwind Re), respectively. The ability of Northwind Re and Tailwind Re to pay dividends to their respective parent companies will depend on their satisfaction of applicable regulatory requirements and on the performance of the business reinsured by Northwind Re and Tailwind Re.

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

The ability of Unum Group and certain of its intermediate holding company subsidiaries to continue to receive dividends from their insurance subsidiaries generally depends on the level of earnings of those insurance subsidiaries and additional factors such as RBC ratios and Financial Services Authority (FSA) capital adequacy requirements, funding growth objectives at an affiliate level, and maintaining appropriate capital adequacy ratios to support desired ratings. 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. We intend to retain a level of capital in our traditional U.S. insurance subsidiaries such that we maintain a weighted average RBC level above capital adequacy requirements. We also expect Unum Limited to operate above FSA capital adequacy requirements and minimum solvency margins.

Debt

At September 30, 2012, we had short-term debt of $458.3 million, consisting entirely of securities lending agreements, and long-term debt of $2,781.5 million, consisting primarily of senior secured notes and junior subordinated debt securities. Our leverage ratio, when calculated using consolidated debt to total consolidated capital, was 30.5 percent at September 30, 2012, compared to 28.7 percent at December 31, 2011. Our leverage ratio, when calculated excluding the non-recourse debt and associated capital of Tailwind Holdings and Northwind Holdings and the short-term debt arising from securities lending agreements, was 25.2 percent at September 30, 2012, compared to 23.5 percent at December 31, 2011. The increase in our consolidated debt to total consolidated capital leverage ratio is due primarily to the issuance of $250.0 million senior notes in August 2012 and the increase in short-term debt related to securities lending agreements outstanding at September 30, 2012, partially offset by our principal payments on the debt of Northwind Holdings and Tailwind Holdings during the first nine months of 2012. Leverage is measured as total debt to total capital, which we define as total long-term and short-term debt plus stockholders' equity, excluding the net unrealized gain or loss on securities and the net gain or loss on cash flow hedges. We believe that a leverage ratio which excludes the net unrealized gains and losses on securities and the net gain or loss on cash flow hedges, both of which tend to fluctuate depending on market conditions and general economic trends, and which also excludes the non-recourse debt and associated capital of Tailwind Holdings and Northwind Holdings and the short-term debt arising from securities lending is a better indicator of our ability to meet our financial obligations.

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We monitor our compliance with our debt covenants.  There are no significant financial covenants associated with any of our outstanding debt obligations.  We remain in compliance with all debt covenants and have not observed any current trends that would cause a breach of any debt covenants.

See "Debt" in Part II, Item 7 of our annual report on Form 10-K for the year ended December 31, 2011, for further discussion.

Commitments

At September 30, 2012, we had legally binding unfunded commitments of $112.2 million and $5.6 million, which are recognized as liabilities in our consolidated balance sheets, to fund tax credit partnership investments and transferable state tax credits, respectively, with a corresponding recognition of other long-term investments and other assets, respectively. In addition, we had non-binding commitments of $125.0 million to fund certain investments in private placement fixed maturity securities, $73.1 million to fund certain private equity partnerships, and $117.1 million to fund certain commercial mortgage loans. These amounts may or may not be funded.

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, 2011. During the first nine months of 2012, there were no substantive changes in our commitments, contractual obligations, or other off-balance sheet arrangements other than the changes in outstanding long-term and short-term debt and non-binding commitments for certain investments, as noted herein.

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, which increase our investment income with minimal risk. We account for all of our securities lending agreements and repurchase agreements as collateralized financings. We had $458.3 million of securities lending agreements outstanding which were collateralized by cash at September 30, 2012 and were reported as short-term debt in our consolidated balance sheets. The cash received as collateral was reinvested in short-term investments. The average balance during the first nine months of 2012 was $422.6 million, and the maximum amount outstanding at any month end was $467.1 million. In addition, at September 30, 2012, we had $15.7 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 2012 was $15.8 million, and the maximum amount outstanding at any month end was $16.9 million.

We had no repurchase agreements outstanding at September 30, 2012, nor did we utilize any repurchase agreements during the first nine months of 2012. Our use of 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.

Ratings

AM Best, Fitch, Moody's, and 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

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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 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
Issuer Credit Ratings	bbb (Good)	BBB (Good)	Baa2 (Adequate)	BBB (Adequate)
Financial Strength Ratings
Provident Life and Accident	A (Excellent)	A (Strong)	A2 (Good)	A (Strong)
Provident Life and Casualty	A (Excellent)	A (Strong)	Not Rated	Not Rated
Unum Life of America	A (Excellent)	A (Strong)	A2 (Good)	A (Strong)
First Unum Life	A (Excellent)	A (Strong)	A2 (Good)	A (Strong)
Colonial Life & Accident	A (Excellent)	A (Strong)	A2 (Good)	A (Strong)
Paul Revere Life	A (Excellent)	A (Strong)	A2 (Good)	A (Strong)
Paul Revere Variable	B++(Good)	A (Strong)	A2 (Good)	Not Rated
Unum Limited	Not Rated	Not Rated	Not Rated	A (Strong)

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.

On February 6, 2012 and August 3, 2012, Fitch affirmed its A rating of Unum's domestic insurance subsidiaries and affirmed the senior debt rating of Unum Group at BBB. Fitch's rating outlook for all ratings is "stable." On March 15, 2012, AM Best affirmed its A rating of Unum's domestic insurance subsidiaries and affirmed the bbb issuer credit rating for Unum Group. AM Best's outlook for all ratings is "stable." On August 16, 2012, Moody's upgraded the financial strength rating of Unum's primary domestic insurance subsidiaries from A3 to A2 and raised the credit ratings of Unum Group's senior debt from Baa3 to Baa2. Moody's outlook for all ratings is "stable." On October 9, 2012, S&P raised its credit rating of Unum Group's senior debt from BBB- to BBB and raised the financial strength ratings of Unum's primary domestic insurance subsidiaries from A- to A. S&P revised the outlook on all ratings to "stable."

There have been no other changes in any of the rating agencies' outlook statements or ratings during the first nine months of 2012 or prior to the date of this filing.

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. Based on our ongoing dialogue with the rating agencies concerning our improved insurance risk profile, our financial flexibility, our operating performance, and the quality of our investment portfolio, we do not expect any negative actions from any of the four rating agencies related to either Unum Group's current issuer credit ratings or the financial strength ratings of its insurance subsidiaries. However, in the event that we are unable to meet the rating agency specific guideline values to maintain our current ratings, including but not limited to maintenance of our capital management metrics at the threshold values stated and maintenance of our financial flexibility and operational consistency, we could be placed on a negative credit watch, with a potential for a downgrade to both our issuer credit ratings and our financial strength ratings.

See our annual report on Form 10-K for the year ended December 31, 2011 for further information regarding our debt and financial strength ratings and the risks associated with rating changes.

80

ITEM 3. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

We are subject to various market risk exposures including interest rate risk and foreign exchange rate 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, 2011. During the first nine months of 2012, there was no substantive change to our market risk or the management of this risk.

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 quarterly report. Based on that evaluation, these officers concluded that our disclosure controls and procedures were effective as of September 30, 2012.

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, 2012 that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

81

PART II

ITEM 1. LEGAL PROCEEDINGS

Refer to Part I, Item 1, Note 9 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, 2011.

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 2012:

	(a) Total Number of Shares Purchased	(b) Average Price Paid per Share (1)		(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 (2)
July 1 - 31, 2012	—	$	—	—	$	750,000,000
August 1 - 31, 2012	3,423,000	19.26		3,423,000	684,075,516
September 1 - 30, 2012	1,696,687	20.11		1,696,687	649,950,390
Total	5,119,687			5,119,687

(1) The average price paid per share excludes the cost of commissions.

(2) In July 2012, our board of directors authorized the repurchase of up to $750.0 million of Unum Group's common stock through January 2014. This program replaced the previous authorization of $1.0 billion that was scheduled to expire in August 2012.

82

ITEM 6. EXHIBITS

Index to Exhibits

Exhibit 4.1	Form of 5.75% Senior Note due 2042 (incorporated by reference to Exhibit 4.1 of Unum Group's Form 8-K filed on August 23, 2012).
Exhibit 4.2	Indenture for Senior Debt Securities, dated as of August 23, 2012, between Unum Group and The Bank of New York Mellon Trust Company, N.A., as Trustee (incorporated by reference to Exhibit 4.2 of Unum Group's Form 8-K filed on August 23, 2012).
Exhibit 10.1	Form of Restricted Stock Unit Agreement with Director for awards under the Unum Group Stock Incentive Plan of 2012.
Exhibit 15	Letter Re: Unaudited Interim Financial Information.
Exhibit 31.1	Certification of Chief Executive Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
Exhibit 31.2	Certification of Chief Financial Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
Exhibit 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.
Exhibit 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.
Exhibit 101	The following financial statements from Unum Group’s Quarterly Report on Form 10-Q for the quarter ended September 30, 2012, filed on November 1, 2012, formatted in XBRL: (i) Consolidated Balance Sheets, (ii) Consolidated Statements of Income, (iii) Consolidated Statements of Comprehensive Income, (iv) Consolidated Statements of Stockholders' Equity, (v) Consolidated Statements of Cash Flows, (vi) the Notes to Consolidated Financial Statements.

83

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, 2012	/s/ Thomas R. Watjen
		Thomas R. Watjen
		President and Chief Executive Officer
Date:	November 1, 2012	/s/ Richard P. McKenney
		Richard P. McKenney
		Executive Vice President and Chief Financial Officer
Date:	November 1, 2012	/s/ Vicki W. Corbett
		Vicki W. Corbett
		Senior Vice President, Controller

84

EX-10.1

EXHIBIT 10.1

RESTRICTED STOCK UNIT AGREEMENT WITH DIRECTOR

(Unum Group Stock Incentive Plan of 2012)

THIS AGREEMENT, dated as of [Grant Date], is entered into by and between Unum Group, a Delaware corporation (the “Company”), and [Participant Name] (the “Director”).

W I T N E S S E T H

In consideration of the mutual promises and covenants made herein and the mutual benefits to be derived herefrom, the parties hereto agree as follows:

1. Grant, Vesting and Forfeiture of Restricted Stock Units.

(a)Grant. Subject to the provisions of this Agreement and to the provisions of the Unum Group Stock Incentive Plan of 2012 (the “Plan”), the Company hereby grants to the Director, as of [Grant Date] (the “Grant Date”), [Number Granted] Restricted Stock Units (the “Restricted Stock Units”), each with respect to one share of common stock of the Company, par value $0.10 per Share. All capitalized terms used herein, to the extent not defined, shall have the meaning set forth in the Plan.

(b)Vesting During the Restriction Period. Subject to the terms and conditions of this Agreement, the Restricted Stock Units shall vest and no longer be subject to any restriction on the anniversaries of the Grant Date set forth below (the period during which restrictions apply, the “Restriction Period”):

Vesting Date	Percentage of Total Grant Vesting
First Anniversary of the Grant Date	100%

(c)    Forfeiture Upon Termination of Service: Accelerated Vesting Upon Termination Due to Death or Disability.

(i)Upon the Director's Termination of Service (as defined below) for any reason (other than due to the Director's death, Disability or Retirement) during the Restriction Period, all Restricted Stock Units still subject to restriction shall be forfeited.

(ii)Upon the Director's Termination of Service during the Restriction Period due to the Director's death, Disability or Retirement, the restrictions applicable to the Restricted Stock Units shall lapse, and such Restricted Stock Units shall become free of all restrictions and become fully vested.

(iii)For purposes of this Agreement, “Retirement” shall mean the Director's Termination of Service after the attainment of at least four years of continuous service as a director of the Company only if such Termination of Service is approved as a “Retirement” by the Committee.

(iv)For purposes of this Agreement, service with the Company shall include service with the Company's Affiliates and successors. Nothing in this Agreement or the Plan shall confer upon the Director any right to continue in the service of the Company or any of its Affiliates or interfere in any way with the right of the Company or any such Affiliates to terminate the Director's service at any time. For purposes of this Agreement, “Termination of Service” means the termination of the Director's service with the Company and any of its Subsidiaries or Affiliates.

2. Settlement of Units.

As soon as practicable after the date on which the Restriction Period expires, and in no event later than 30 days after such date, the Company shall deliver to the Director or his or her personal representative, in book-position or certificate form, one Share that does not bear any restrictive legend for each Share subject to the Restricted Stock Unit.

3. Nontransferability of the Restricted Stock Units.

During the Restriction Period and until such time as the Restricted Stock Units are ultimately settled as provided

1

in Section 2 above, the Restricted Stock Units and Shares covered by the Restricted Stock Units shall not be transferable by the Director by means of sale, assignment, exchange, encumbrance, pledge, hedge or otherwise. Any purported or attempted transfer of such Restricted Stock Units or Shares shall be null and void.

4. Rights as a Stockholder.

During the Restriction Period, the Director shall not be entitled to any rights of a stockholder with respect to the Restricted Stock Units (including, without limitation, any voting rights), provided that with respect to any dividends paid on Shares underlying the Restricted Stock Units, such dividends will be reinvested into additional Restricted Stock Units, which, as applicable, shall vest and be settled at such time as the underlying Restricted Stock Units vest and are settled.

5. Adjustment; Change in Control.

In the event of certain transactions during the Restriction Period, the Restricted Stock Units shall be subject to adjustment as provided in Section 3(d) of the Plan or any applicable successor provision under the Plan. Notwithstanding anything in Section 1 to the contrary: (a) upon the occurrence of a Change in Control, unless a Replacement Award is granted in respect of the Restricted Stock Units (in which case this clause (a) shall not apply), the restrictions applicable to the Restricted Stock Units shall lapse and such Restricted Stock Units shall become free of all restrictions and fully vested as of such Change in Control and shall be settled as soon as practicable following the date of such Change in Control (but not later than 30 days thereafter); and (b) if a Replacement Award is granted in respect of the Restricted Stock Units in connection with such Change in Control, upon a Termination of Service of the Director occurring upon or during the two years immediately following the date of such Change in Control, the restrictions applicable to such Replacement Award, to the extent not vested as of such Termination of Service, shall lapse, and such Replacement Award shall become free of all restrictions and fully vested and shall be settled as soon as practicable following the date of Termination of Service (but not later than 30 days thereafter); provided, however, that any Restricted Stock Units that constitute “nonqualified deferred compensation” as defined under Section 409A of the Code shall, to the extent necessary to avoid the imposition of penalty taxes under Section 409A of the Code, not be so settled unless the Change in Control constitutes a “change in control event” within the meaning of Section 409A of the Code (it being understood that nothing in this Section 5 shall preclude the Company from settling upon a Change in Control any Restricted Stock Units that are not replaced by a Replacement Award, to the extent effectuated in accordance with Treasury Reg. § 1.409A-3(j)(ix)).

6. Payment of Transfer Taxes, Fees and Other Expenses.

The Company agrees to pay any and all original issue taxes and stock transfer taxes that may be imposed on the issuance of Shares received by the Director in connection with the Restricted Stock Units, together with any and all other fees and expenses necessarily incurred by the Company in connection therewith.

7. Other Restrictions.

(a)The Restricted Stock Units shall be subject to the requirement that, if at any time the Committee shall determine that (i) the listing, registration or qualification of the Shares subject or related thereto upon any securities exchange or under any state or federal law is required, or (ii) the consent or approval of any government regulatory body is required, then in any such event, the grant of Restricted Stock Units shall not be effective unless such listing, registration, qualification, consent or approval shall have been effected or obtained free of any conditions not acceptable to the Committee.

(b)The Director is an insider as described under the Company's Insider Trading Policy (as in effect from time to time and any successor policies). Accordingly, the Director shall be required to obtain pre-clearance from the General Counsel or Securities Counsel of the Company prior to purchasing or selling any of the Company's securities, including any Shares issued upon vesting of the Restricted Stock Units, and may be prohibited from selling such securities other than during an open trading window. The Director further acknowledges that, in its discretion, the Company may prohibit the Director from selling such securities even during an open trading window if the Company has concerns over the potential for insider trading.

8. Taxes.

As a non-employee director of the Company, the Director will be responsible for, and will duly and timely comply with all applicable laws and regulations relating to the collection, payment, reporting and remittance of any and all federal, state or local taxes, charges or fees resulting from the receipt of amounts described in this Agreement. Neither the Company nor any of its Affiliates shall be liable for any such taxes, charges or fees resulting from the receipt of amounts described in this Agreement.

2

9. Notices.

All notices and other communications under this Agreement shall be in writing and shall be given by hand delivery to the other party or by facsimile, overnight courier, or registered or certified mail, return receipt requested, postage prepaid, addressed as follows:

If to the Director:

At the most recent address

on file at the Company

If to the Company:

Unum Group

1 Fountain Square

Chattanooga, Tennessee 37402

Attention: Executive Compensation, Human Resources

or to such other address or facsimile number as any party shall have furnished to the other in writing in accordance with this Section 9. Notices and communications shall be effective when actually received by the addressee. Notwithstanding the foregoing, the Director consents to electronic delivery of documents required to be delivered by the Company under the securities laws.

10. Effect of Agreement.

This Agreement is personal to the Director and, without the prior written consent of the Company, shall not be assignable by the Director otherwise than by will or the laws of descent and distribution. This Agreement shall inure to the benefit of and be enforceable by the Director's legal representatives. This Agreement shall inure to the benefit of and be binding upon the Company and its successors and assigns.

11. Laws Applicable to Construction; Consent to Jurisdiction.

The interpretation, performance and enforcement of this Agreement shall be governed by the laws of the State of Delaware without reference to principles of conflict of laws, as applied to contracts executed in and performed wholly within the State of Delaware. In addition to the terms and conditions set forth in this Agreement, the Restricted Stock Units are subject to the terms and conditions of the Plan, which is hereby incorporated by reference.

12. Severability.

The invalidity or enforceability of any provision of this Agreement shall not affect the validity or enforceability of any other provision of this Agreement.

13. Conflicts and Interpretation.

In the event of any conflict between this Agreement and the Plan, the Plan shall control. In the event of any ambiguity in this Agreement, or any matters as to which this Agreement is silent, the Plan shall govern including, without limitation, the provisions thereof pursuant to which the Committee has the power, among others, to (a) interpret the Plan, (b) prescribe, amend and rescind rules and regulations relating to the Plan, and (c) make all other determinations deemed necessary or advisable for the administration of the Plan. The Director hereby acknowledges that a copy of the Plan has been made available to him and agrees to be bound by all the terms and provisions thereof. The Director and the Company each acknowledge that this Agreement (together with the Plan) constitutes the entire agreement and supersedes all other agreements and understandings, both written and oral, between the parties or either of them, with respect to the subject matter hereof.

14. Amendment.

The Company may modify, amend or waive the terms of the Restricted Stock Unit award, prospectively or retroactively, but no such modification, amendment or waiver shall materially impair the rights of the Director without his or her consent, except as required by applicable law, stock exchange rules, tax rules or accounting rules. The waiver by either party of compliance with any provision of this Agreement shall not operate or be construed as a waiver of any other provision of this Agreement, or of any subsequent breach by such party of a provision of this Agreement.

3

15. Section 409A.

It is the intention of the Company that the Restricted Stock Units shall either (a) not constitute “nonqualified deferred compensation” as defined under Section 409A of the Code, or (b) comply in all respects with the requirements of Section 409A of the Code and the regulations promulgated thereunder, such that no delivery of or failure to deliver Shares pursuant to this Agreement will result in the imposition of taxation or penalties as a consequence of the application of Section 409A of the Code. Restricted Stock Units that (i) constitute “nonqualified deferred compensation” as defined under Section 409A of the Code and (ii) vest as a consequence of the Director's Termination of Service shall not be delivered until the date that the Director incurs a “separation from service” within the meaning of Section 409A of the Code. If the Company determines after the Grant Date that an amendment to this Agreement is necessary to ensure the foregoing, it may make such an amendment, notwithstanding Section 14 above, effective as of the Grant Date or any later date, without the consent of the Director.

16. Headings.

The headings of Sections herein are included solely for convenience of reference and shall not affect the meaning or interpretation of any of the provisions of this Agreement.

17. Counterparts.

This Agreement may be executed in counterparts, which together shall constitute one and the same original.

IN WITNESS WHEREOF, as of the date first above written, the Company has caused this Agreement to be executed on its behalf by a duly authorized officer and the Director has hereunto set the Director's hand.

Date:	[Acceptance Date]	DIRECTOR: [Director Name]
		[Director Signature]
		UNUM GROUP
		By:
			[Authorized Signature]
			[Name]
			[Title]

4

EX-15

EXHIBIT 15

LETTER RE: UNAUDITED INTERIM FINANCIAL INFORMATION

Board of Directors and Stockholders

Unum Group

We are aware of the incorporation by reference in the following Registration Statements:

1. Registration Statement (Form S-8 No. 333-81669) pertaining to:

a. Provident Companies, Inc. Stock Plan of 1999

b. Provident Companies, Inc. Non-Employee Director Compensation Plan of 1998

c. Employee Stock Option Plan of 1998

d. Amended and Restated Annual Management Incentive Compensation Plan of 1994,

2. Registration Statement (Form S-8 No. 333-85882) pertaining to:

a. UnumProvident Corporation Stock Plan of 1999

b. UnumProvident Corporation 401(k) Retirement Plan (as amended on February 15, 2002)

c. UnumProvident Corporation Broad-Based Stock Plan of 2001 (as amended on February 8, 2001)

d. UnumProvident Corporation Broad-Based Stock Plan of 2002

e. UnumProvident Corporation Employee Stock Option Plan,

3. Registration Statement (Form S-8 No. 333-123422) of Unum Group (formerly UnumProvident Corporation) pertaining to:

a. UnumProvident Corporation Amended and Restated Employee Stock Purchase Plan

b. UnumProvident Corporation Amended and Restated Non-Employee Director Compensation Plan of 2004,

4. Registration Statement (Form S-8 No. 333-145400) of Unum Group pertaining to the Unum Group Stock Incentive Plan of 2007,

5. Registration Statement (Form S-8 No. 333-158885) of Unum Group pertaining to the Unum Limited Savings-Related Share Option Scheme of 2008,

6. Registration Statement (Form S-3 ASR No. 333-177892),

7. Registration Statement (Form S-8 No. 333-183732) of Unum Group pertaining to the Unum European Holding Company Limited Savings-Related Share Option Scheme 2011, and

8. Registration Statement (Form S-8 No. 333-183733) of Unum Group pertaining to the Unum Group Stock Incentive Plan of 2012,

of our report dated November 1, 2012 relating to the unaudited consolidated interim financial statements of Unum Group and subsidiaries that are included in this Form 10-Q for the quarter ended September 30, 2012.

/s/ ERNST & YOUNG LLP

Chattanooga, Tennessee

November 1, 2012

EX-31.1

EXHIBIT 31.1

CERTIFICATION

I, Thomas R. Watjen, 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, 2012	/s/ Thomas R. Watjen
		Thomas R. Watjen
		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, 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, 2012	/s/ Richard P. McKenney
		Richard P. McKenney
		Executive Vice President and 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, 2012 as filed with the Securities and Exchange Commission on the date hereof (the Report), the undersigned, Thomas R. Watjen, 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, 2012	/s/ Thomas R. Watjen
		Thomas R. Watjen
		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, 2012 as filed with the Securities and Exchange Commission on the date hereof (the Report), the undersigned, Richard P. McKenney, 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, 2012	/s/ Richard P. McKenney
		Richard P. McKenney
		Executive Vice President and 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

Mortgage Loans by Property Type (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans	$ 1,665.2	$ 1,612.3
Percent of Total	100.00%	100.00%
Apartment
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans	34.3	28.0
Percent of Total	2.10%	1.80%
Industrial
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans	528.4	502.0
Percent of Total	31.70%	31.10%
Mixed
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans	78.9	93.5
Percent of Total	4.70%	5.80%
Office
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans	677.1	659.3
Percent of Total	40.70%	40.90%
Retail
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans	346.5	322.4
Percent of Total	20.80%	20.00%
Other
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans	$ 0	$ 7.1
Percent of Total	0.00%	0.40%

XML

Reconciliation of Total Operating Revenue and Operating Income by Segment to Revenue and Net Income (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Segment Reporting, Revenue Reconciling Item [Line Items]
Operating Revenue by Segment	$ 2,606.7	$ 2,569.5	$ 7,825.6	$ 7,685.5
Net Realized Investment Gain (Loss)	21.3	(23.9)	31.6	(12.3)
Revenue	2,628.0	2,545.6	7,857.2	7,673.2
Operating Income by Segment	310.7	320.6	930.0	986.9
Net Realized Investment Gain (Loss)	21.3	(23.9)	31.6	(12.3)
Non-operating Retirement-related Loss	(11.6)	(8.0)	(34.8)	(24.0)
Income Tax	90.2	86.7	266.3	297.4
Net Income	$ 230.2	$ 202.0	$ 660.5	$ 653.2

XML

Notional Amounts for Each Category of Derivative Activity (Detail) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Derivative [Line Items]
Balance at beginning of period	$ 1,309,500,000	$ 1,538,700,000	$ 1,413,000,000	$ 1,681,900,000
Additions	275,000,000	15,000,000	331,000,000	46,900,000
Terminations	71,300,000	55,000,000	230,800,000	230,100,000
Balance at ending of period	1,513,200,000	1,498,700,000	1,513,200,000	1,498,700,000
Swaps | Receive Variable/Pay Fixed
Derivative [Line Items]
Balance at beginning of period	174,000,000	174,000,000	174,000,000	174,000,000
Additions	0	0	0	0
Terminations	0	0	0	0
Balance at ending of period	174,000,000	174,000,000	174,000,000	174,000,000
Swaps | Receive Fixed/Pay Fixed
Derivative [Line Items]
Balance at beginning of period	540,500,000	579,700,000	554,000,000	617,900,000
Additions	0	0	0	0
Terminations	26,300,000	5,000,000	39,800,000	43,200,000
Balance at ending of period	514,200,000	574,700,000	514,200,000	574,700,000
Swaps | Receive Fixed/Pay Variable
Derivative [Line Items]
Balance at beginning of period	595,000,000	785,000,000	685,000,000	890,000,000
Additions	250,000,000	0	250,000,000	0
Terminations	45,000,000	50,000,000	135,000,000	155,000,000
Balance at ending of period	800,000,000	735,000,000	800,000,000	735,000,000
Forwards
Derivative [Line Items]
Balance at beginning of period	0	0	0	0
Additions	25,000,000	15,000,000	81,000,000	46,900,000
Terminations	0	0	56,000,000	31,900,000
Balance at ending of period	$ 25,000,000	$ 15,000,000	$ 25,000,000	$ 15,000,000

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Premium Income by Major Line of Business within Each Segment (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Segment Reporting Information [Line Items]
Premiums Earned, Net	$ 1,929.4	$ 1,881.2	$ 5,778.9	$ 5,625.7
Unum U.S.
Segment Reporting Information [Line Items]
Premiums Earned, Net	1,111.9	1,074.4	3,338.9	3,213.0
Unum U.S. | Group Long term Disability
Segment Reporting Information [Line Items]
Premiums Earned, Net	392.4	393.7	1,185.7	1,185.3
Unum U.S. | Group Short-term Disability
Segment Reporting Information [Line Items]
Premiums Earned, Net	120.1	115.2	356.0	339.0
Unum U.S. | Group Life
Segment Reporting Information [Line Items]
Premiums Earned, Net	297.3	277.6	885.1	825.3
Unum U.S. | Accidental Death & Dismemberment
Segment Reporting Information [Line Items]
Premiums Earned, Net	29.2	27.7	86.2	81.6
Unum U.S. | Individual Disability-Recently Issued
Segment Reporting Information [Line Items]
Premiums Earned, Net	119.9	116.6	357.0	348.3
Unum U.S. | Voluntary Benefits
Segment Reporting Information [Line Items]
Premiums Earned, Net	153.0	143.6	468.9	433.5
Unum U.K.
Segment Reporting Information [Line Items]
Premiums Earned, Net	175.2	175.5	519.1	518.4
Unum U.K. | Group Long term Disability UK
Segment Reporting Information [Line Items]
Premiums Earned, Net	102.9	107.3	306.5	318.3
Unum U.K. | Group Life UK
Segment Reporting Information [Line Items]
Premiums Earned, Net	56.4	52.1	164.6	151.6
Unum U.K. | Supplemental and Voluntary UK
Segment Reporting Information [Line Items]
Premiums Earned, Net	15.9	16.1	48.0	48.5
Colonial Life
Segment Reporting Information [Line Items]
Premiums Earned, Net	299.4	283.7	892.6	846.1
Colonial Life | Accident, Sickness, and Disability - Colonial
Segment Reporting Information [Line Items]
Premiums Earned, Net	181.8	174.3	541.8	519.7
Colonial Life | Life Colonial
Segment Reporting Information [Line Items]
Premiums Earned, Net	52.2	47.0	156.3	140.0
Colonial Life | Cancer and Critical Illness - Colonial
Segment Reporting Information [Line Items]
Premiums Earned, Net	65.4	62.4	194.5	186.4
Closed Block
Segment Reporting Information [Line Items]
Premiums Earned, Net	342.9	347.6	1,028.3	1,048.2
Closed Block | Individual Disability Closed Block
Segment Reporting Information [Line Items]
Premiums Earned, Net	183.1	196.4	554.9	595.0
Closed Block | Long-term Care
Segment Reporting Information [Line Items]
Premiums Earned, Net	159.4	152.1	471.5	453.5
Closed Block | All Other Segments
Segment Reporting Information [Line Items]
Premiums Earned, Net	$ 0.4	$ (0.9)	$ 1.9	$ (0.3)

XML

Realized Investment Gains and Losses Reported in Consolidated Statements of Income (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Gain (Loss) on Investments [Line Items]
Gross Gains on Sales	$ 4.6	$ 14.8	$ 14.0	$ 33.0
Gross Losses on Sales	(2.3)	(5.4)	(9.0)	(22.1)
Other-Than-Temporary Impairment Loss	0	(1.2)	0	(4.2)
Gross Gains on Sales	2.3	1.6	2.3	7.1
Gross Losses on Sales	0	0	0	(0.2)
Impairment Loss	(1.3)	(0.4)	(1.8)	(0.4)
Embedded Derivative in Modified Coinsurance Arrangement	19.7	(33.7)	28.7	(24.4)
Foreign Currency Transactions	(1.7)	0.4	(2.6)	(1.1)
Net Realized Investment Gain (Loss)	$ 21.3	$ (23.9)	$ 31.6	$ (12.3)

XML

Fair Values of Financial Instruments Level 3 Quantitative Sensitivity Analysis (Details) (Fair Value, Inputs, Level 3 [Member], USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2012
Public_Utilities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Fair Value, Investments, Valuation Techniques	- Comparability Adjustment
Investments, Fair Value Disclosure, Significant Assumptions	0.20% - 0.20%/0.20%	[1]
Mortgage/Asset-backed Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Fair Value, Investments, Valuation Techniques	- Discount for Size
Investments, Fair Value Disclosure, Significant Assumptions	5.77% - 5.86%/5.84%	[1]
All Other Corporate Bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Fair Value, Investments, Valuation Techniques	- Change in Benchmark Reference - Comparability Adjustment - Discount for Size - Lack of Marketability - Volatility of Credit - Market Convention
Investments, Fair Value Disclosure, Significant Assumptions	(0.05)% - 2.60%/0.15% (0.50)% - (0.50)%/(0.50)% 0.50% - 0.50%/0.50% 0.01% - 1.00%/0.22% (0.50)% - 6.92%/1.37% Priced at Par	[1],[2],[3],[4],[5]
Corporate Bond Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Fair Value, Investments, Valuation Techniques	- Comparability Adjustment - Discount for Size - Lack of Marketability - Volatility of Credit - Market Convention
Investments, Fair Value Disclosure, Significant Assumptions	(1.24)% - 0.50%/(0.16)% 0.00% - 0.10%/0.04% 0.01% - 0.40%/0.19% 0.01% - 0.01%/0.01% Priced at Par	[6]
Equity Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Fair Value, Investments, Valuation Techniques	- Market Convention
Investments, Fair Value Disclosure, Significant Assumptions	Priced at Cost or Owner's Equity	[3]
Embedded Derivative in Modified Coinsurance Arrangement
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Fair Value, Derivative Financial Instruments, Liabilities, Valuation Techniques	- Projected Liability Cash Flows
Investments, Fair Value Disclosure, Significant Assumptions	Actuarial Assumptions	[7]
Estimate of Fair Value, Fair Value Disclosure [Member] | Public_Utilities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Fixed Maturity Securities	17.4	[6]
Estimate of Fair Value, Fair Value Disclosure [Member] | Mortgage/Asset-backed Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Fixed Maturity Securities	0.5	[1]
Estimate of Fair Value, Fair Value Disclosure [Member] | All Other Corporate Bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Fixed Maturity Securities	485.1	[1],[2],[3],[4],[5],[6]
Estimate of Fair Value, Fair Value Disclosure [Member] | Corporate Bond Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Fixed Maturity Securities	115.9	[1],[3],[4],[5],[6]
Estimate of Fair Value, Fair Value Disclosure [Member] | Equity Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Equity Securities	4.1	[3]
Estimate of Fair Value, Fair Value Disclosure [Member] | Embedded Derivative in Modified Coinsurance Arrangement
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Embedded Derivative, Fair Value of Embedded Derivative Liability	(107.0)	[7]

[1] Represents basis point adjustments based on issue/issuer size relative to the benchmark

[2] Represents basis point adjustments for changes in benchmark spreads associated with various ratings categories

[3] Represents a decision to price based on par value, cost, or owner's equity when limited data is available

[4] Represents basis point adjustments for credit-specific factors

[5] Represents basis point adjustments to apply a discount due to the illiquidity of an investment

[6] Represents basis point adjustments for changes in benchmark spreads associated with various industry sectors

[7] Represents various actuarial assumptions required to derive the liability cash flows including incidence, termination, and lapse rates

XML

Assets by Segment (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Segment Reporting Information [Line Items]
Assets	$ 62,119.6	$ 59,555.2
Unum U.S.
Segment Reporting Information [Line Items]
Assets	19,135.0	18,583.6
Unum U.K.
Segment Reporting Information [Line Items]
Assets	3,945.4	3,549.5
Colonial Life
Segment Reporting Information [Line Items]
Assets	3,357.9	3,167.8
Closed Block
Segment Reporting Information [Line Items]
Assets	32,718.9	31,439.5
Corporate
Segment Reporting Information [Line Items]
Assets	$ 2,962.4	$ 2,814.8

XML

Pensions and Other Postretirement Benefits (Tables)

9 Months Ended

Sep. 30, 2012

Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]

Net Periodic Benefit Costs

The components of net periodic benefit cost related to the Company sponsored defined benefit pension and other postretirement benefit plans (OPEB) for our employees are as follows:

	Three Months Ended September 30
	Pension Benefits
	U.S. Plans						Non U.S. Plans						OPEB
	2012			2011			2012			2011			2012			2011
	(in millions of dollars)
Service Cost	$	12.2		$	10.7		$	1.2		$	1.1		$	0.4		$	0.5
Interest Cost	21.1			19.4			2.2			2.3			2.3			2.5
Expected Return on Plan Assets	(22.2		)	(21.9		)	(2.8		)	(3.1		)	(0.2		)	(0.2		)
Amortization of:
Net Actuarial Loss	11.5			8.0			0.1			—			—			—
Prior Service Credit	(0.1		)	(0.1		)	—			—			(0.6		)	(0.6		)
Total	$	22.5		$	16.1		$	0.7		$	0.3		$	1.9		$	2.2

	Nine Months Ended September 30
	Pension Benefits
	U.S. Plans						Non U.S. Plans						OPEB
	2012			2011			2012			2011			2012			2011
	(in millions of dollars)
Service Cost	$	36.6		$	32.0		$	3.6		$	3.5		$	1.2		$	1.4
Interest Cost	63.3			58.2			6.4			6.7			7.1			7.5
Expected Return on Plan Assets	(66.5		)	(65.7		)	(8.3		)	(9.2		)	(0.5		)	(0.5		)
Amortization of:
Net Actuarial Loss	34.4			24.0			0.4			—			—			—
Prior Service Credit	(0.4		)	(0.4		)	—			—			(1.9		)	(1.9		)
Total	$	67.4		$	48.1		$	2.1		$	1.0		$	5.9		$	6.5

XML

Location and Fair Values of Derivative Financial Instruments (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Designated as Hedging Instrument | Other Long term Investments
Derivative [Line Items]
Asset Derivatives Fair Value	$ 108.2	$ 137.7
Designated as Hedging Instrument | Other Liabilities
Derivative [Line Items]
Liability Derivatives Fair Value	182.5	173.7
Designated as Hedging Instrument | Interest Rate Swaps and Forwards | Other Long term Investments
Derivative [Line Items]
Asset Derivatives Fair Value	101.3	134.2
Designated as Hedging Instrument | Interest Rate Swaps and Forwards | Other Liabilities
Derivative [Line Items]
Liability Derivatives Fair Value	33.3	32.9
Designated as Hedging Instrument | Foreign Exchange Contracts | Other Long term Investments
Derivative [Line Items]
Asset Derivatives Fair Value	6.9	3.5
Designated as Hedging Instrument | Foreign Exchange Contracts | Other Liabilities
Derivative [Line Items]
Liability Derivatives Fair Value	149.2	140.8
Not Designated as Hedging Instrument | Embedded Derivative in Modified Coinsurance Arrangement | Other Liabilities
Derivative [Line Items]
Liability Derivatives Fair Value	$ 107.0	$ 135.7

XML

Mortgage Loans, Sorted by Applicable Credit Quality Indicators, Loan to Value Ratio (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans	$ 1,665.2	$ 1,612.3
Loan to Value Ratio Below or Equal to 65 Percent
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans	648.6	578.4
Loan To Value Ratio Above 65 To 75 Percent
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans	781.9	802.3
Loan To Value Ratio Above 75 To 85 Percent
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans	186.8	165.1
Loan To Value Ratio Above 85 Percent
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans	$ 47.9	$ 66.5

XML

Distribution of the Maturity Dates for Fixed Maturity Securities (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Available-for-Sale Securities, Total Amortized Cost
1 year or less	$ 990.2	$ 715.1
Over 1 year through 5 years	5,613.8	5,161.5
Over 5 years through 10 years	9,776.2	9,630.5
Over 10 years	18,971.8	18,499.0
Available-for-sale Securities, Debt Maturities, Gross Subtotal	35,352.0	34,006.1
Mortgage/Asset-Backed Securities	2,105.3	2,634.6
Total Fixed Maturity Securities	37,457.3	36,640.7
Available-for-Sale Securities, Unrealized Gain Position, Gross Gain
1 year or less	23.4	16.0
Over 1 year through 5 years	590.6	449.8
Over 5 years through 10 years	1,623.1	1,266.3
Over 10 years	4,822.5	3,992.0
Available-For-Sale Securities, Debt Maturities Unrealized Gain Position, Gross Gain, Gross Subtotal, Total	7,059.6	5,724.1
Mortgage/Asset-Backed Securities	318.8	344.1
Total Fixed Maturity Securities	7,378.4	6,068.2
Available-for-Sale Securities, Unrealized Loss Position, Gross Loss
1 year or less	0.1	0.1
Over 1 year through 5 years	7.6	20.7
Over 5 years through 10 years	17.0	52.8
Over 10 years	65.8	143.1
Available-For-Sale Securities, Debt Maturities Unrealized Loss Position, Gross Loss, Gross Subtotal, Total	90.5	216.7
Mortgage/Asset-Backed Securities	0.5	5.5
Total Fixed Maturity Securities	91.0	222.2
Available-for-Sale Securities, Unrealized Gain Position, Fair Value
Fair Value Maturity Distribution [Abstract]
1 year or less	988.7	701.4
Over 1 year through 5 years	6,014.8	4,949.0
Over 5 years through 10 years	11,051.4	9,903.8
Over 10 years	23,082.5	21,082.2
Available-for-sale Securities, Debt Maturities, Fair Value, Gross Subtotal, Total	41,137.4	36,636.4
Mortgage/Asset-Backed Securities	2,415.3	2,859.4
Total Fixed Maturity Securities	43,552.7	39,495.8
Available-for-Sale Securities, Unrealized Loss Position, Fair Value
Fair Value Maturity Distribution [Abstract]
1 year or less	24.8	29.6
Over 1 year through 5 years	182.0	641.6
Over 5 years through 10 years	330.9	940.2
Over 10 years	646.0	1,265.7
Available-for-sale Securities, Debt Maturities, Fair Value, Gross Subtotal, Total	1,183.7	2,877.1
Mortgage/Asset-Backed Securities	8.3	113.8
Total Fixed Maturity Securities	$ 1,192.0	$ 2,990.9

XML

Location of and Gain (Loss) on Embedded Derivative in a Modified Coinsurance Arrangement (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Derivative Instruments, Gain (Loss) [Line Items]
Embedded Derivative in Modified Coinsurance Arrangement	$ 19.7	$ (33.7)	$ 28.7	$ (24.4)

XML

Stockholders' Equity and Earnings Per Common Share - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended				9 Months Ended		12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Mar. 31, 2011	Jun. 30, 2010	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011
Stockholders Equity Note [Line Items]
Outstanding Performance restricted stock units, threshold stock price	$ 26.00				$ 26.00
Antidilutive common shares not included in the computation of dilutive earnings per share	2,800,000	2,400,000			2,400,000	2,100,000
Authorized repurchase of common stock, value	$ 750.0		$ 1,000.0	$ 500.0
Treasury Stock Acquired, Shares	5,100,000				18,600,000		17,700,000
Common stock repurchased	100.2				400.5		419.9
Shares repurchased cost, Commissions	0.1				0.4		0.3
Stock Repurchase Program Remaining Authorized Repurchase Amount	650.0
Treasury Stock Shares Retired			7,700,000
Preferred stock, authorized	25,000,000				25,000,000
Preferred stock, par value	$ 0.10				$ 0.10
Preferred stock, issued	0				0
Share Repurchase Program Expire in May 2011 [Member]
Stockholders Equity Note [Line Items]
Treasury Stock Acquired, Shares		600,000	7,100,000			7,700,000
Common stock repurchased			$ 200.0
Minimum [Member]
Stockholders Equity Note [Line Items]
Outstanding stock options, exercise prices range	$ 11.37				$ 11.37
Outstanding Nonvested stock awards, grant prices range	$ 19.38				$ 19.38
Maximum [Member]
Stockholders Equity Note [Line Items]
Outstanding stock options, exercise prices range	$ 26.29				$ 26.29
Outstanding Nonvested stock awards, grant prices range	$ 26.31				$ 26.31

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Investments - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011
Schedule of Investments [Line Items]
Other than Temporary Impairment Losses, Investments, Portion in Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent			$ 0		$ 0
Fair value of fixed maturity securities, gross unrealized gain	7,378,400,000		7,378,400,000		6,068,200,000
Fair Value of fixed maturity securities, gross unrealized loss	91,000,000		91,000,000		222,200,000
Defaults on securities not OTTI	0
Commitment to fund private placement fixed maturity securities	125,000,000		125,000,000
Carrying amount of variable interest entity investments	452,100,000		452,100,000
Unfunded commitment to fund Investment Partnerships	112,200,000		112,200,000
Commitment to fund partnership Equity Investments	73,100,000		73,100,000
Other Long-term Investments	650,900,000		650,900,000		639,200,000
Commitment to fund SPE - consolidated	0		0
Mortgage Loan policy is not to exceed a loan-to-value ratio, percent	75.00%		75.00%
Mortage Loan Policy Debt Service coverage ratio lower range	125.00%		125.00%
Mortgage Loans issuance, term years	25		25
Impaired Financing Receivable, Average Recorded Investment	15,900,000	26,400,000	18,800,000	20,900,000
Interest income recognized on mortgage loans subsequent to impairment	200,000	200,000	600,000	600,000
realized loss on foreclosure			0
Financing Receivable, Recorder Investment, Nonaccrual status	1		1		1
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due	4,200,000		4,200,000
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due					9,400,000
commitment to fund commercial mortgage loans	117,100,000		117,100,000
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%
Securities Loaned	457,300,000		457,300,000		319,100,000
Cash Collateral for Borrowed Securities	458,300,000		458,300,000		312,300,000
Securities Received as Collateral	15,700,000		15,700,000		16,700,000
Outstanding Repurchase Agreements	0.0		0.0		0
Nonperforming Financing Receivable [Member]
Schedule of Investments [Line Items]
Amount of days past due-DelinquentMortgageLoan	60		60		90
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due					90
Partnership Interests In Tax Credit Investments
Schedule of Investments [Line Items]
Carrying amount of variable interest entity investments	337,400,000		337,400,000
Equity Method Investments
Schedule of Investments [Line Items]
Carrying amount of variable interest entity investments	114,700,000		114,700,000
Bonds
Schedule of Investments [Line Items]
Fair value of fixed maturity securities, investment grade	140,200,000		140,200,000
Nonredeemable Preferred Stock
Schedule of Investments [Line Items]
Other Long-term Investments	100,000		100,000
Partnership Interest
Schedule of Investments [Line Items]
Other Long-term Investments	8,200,000		8,200,000
External Credit Rating, Investment Grade
Schedule of Investments [Line Items]
Fair value of fixed maturity securities, investment grade	41,593,800,000		41,593,800,000
Fair value of fixed maturity securities, gross unrealized gain	7,193,500,000		7,193,500,000
Fair Value of fixed maturity securities, gross unrealized loss	38,000,000		38,000,000
Fixed maturity securities in unrealized loss position, percent of total	41.80%		41.80%
Number of fixed maturity securities that were in an unrealized loss position	36		36
Number of fixed maturity securities in an unrealized loss position continuously for over one year	22		22
External Credit Rating, Non Investment Grade
Schedule of Investments [Line Items]
Fair value of fixed maturity securities, investment grade	3,150,900,000		3,150,900,000
Fair value of fixed maturity securities, gross unrealized gain	184,900,000		184,900,000
Fair Value of fixed maturity securities, gross unrealized loss	$ 53,000,000		$ 53,000,000
Fixed maturity securities in unrealized loss position, percent of total	58.20%		58.20%
Number of fixed maturity securities that were in an unrealized loss position	35		35
Number of fixed maturity securities in an unrealized loss position continuously for over one year	20		20

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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Cash Flows from Operating Activities
Net Income	$ 660.5	$ 653.2
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities
Change in Receivables	9.0	(45.8)
Change in Deferred Acquisition Costs	(62.0)	(60.8)
Change in Insurance Reserves and Liabilities	333.8	321.7
Change in Income Taxes	151.9	37.9
Change in Other Accrued Liabilities	(24.4)	12.4
Non-cash Adjustments to Net Investment Income	(160.7)	(206.6)
Net Realized Investment Gain (Loss)	(31.6)	12.3
Depreciation	63.5	60.2
Other, Net	13.8	4.2
Net Cash Provided by Operating Activities	953.8	788.7
Cash Flows from Investing Activities
Proceeds from Sales of Fixed Maturity Securities	401.2	908.8
Proceeds from Maturities of Fixed Maturity Securities	1,583.6	1,235.0
Proceeds from Sales and Maturities of Other Investments	112.6	101.3
Purchase of Fixed Maturity Securities	(2,479.6)	(2,162.2)
Purchase of Other Investments	(219.4)	(234.3)
Net Sales (Purchases) of Short-term Investments	(194.6)	86.3
Other, Net	(73.7)	(75.9)
Net Cash Used by Investing Activities	(869.9)	(141.0)
Cash Flows from Financing Activities
Net Short-term Debt Borrowings	146.0	117.3
Issuance of Long-term Debt	246.4	0
Long-term Debt Repayments	(45.6)	(66.9)
Issuance of Common Stock	4.2	7.6
Repurchase of Common Stock	(400.5)	(619.9)
Dividends Paid to Stockholders	(98.1)	(90.3)
Other, Net	0.7	3.2
Net Cash Used by Financing Activities	(146.9)	(649.0)
Effect of Foreign Exchange Rate Changes on Cash	0	(0.1)
Net Decrease in Cash and Bank Deposits	(63.0)	(1.4)
Cash and Bank Deposits at Beginning of Year	116.6	53.6
Cash and Bank Deposits at End of Period	$ 53.6	$ 52.2

XML

Commitments and Contingent Liabilities - Additional Information (Detail)	Sep. 30, 2012
Commitments and Contingencies Disclosure [Line Items]
States involved in unclaimed property examination	26
Insurers requested to cross-check benefits	160

XML

Activity in Allowance for Credit Losses (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance at Beginning of Year	$ 1.5	$ 1.5	$ 1.5	$ 1.5
Provisions	1.3	0	1.8	0
Charge-offs, Net of Recoveries	0	0	(0.5)	0
Balance at End of Period	$ 2.8	$ 1.5	$ 2.8	$ 1.5

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Carrying Amount and Fair Value of Financial Instruments (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Assets
Fixed Maturity Securities	$ 44,744.7	$ 42,486.7
Mortgage Loans	1,665.2	1,612.3
Policy Loans	3,117.0	3,051.4
Other Long-term Investments
Derivatives	108.2	137.7
Equity Securities	13.0	11.2
Miscellaneous Long-term Investments	650.9	639.2
Policyholders' Funds
Long-term Debt	2,781.5	2,570.2
Other Liabilities
Derivatives	289.5	309.4
Unfunded commitment to fund Investment Partnerships	112.2
Carrying Amount
Assets
Fixed Maturity Securities	44,744.7	42,486.7
Mortgage Loans	1,665.2	1,612.3
Policy Loans	3,117.0	3,051.4
Other Long-term Investments
Derivatives	108.2	137.7
Equity Securities	13.0	11.2
Miscellaneous Long-term Investments	460.3	436.4
Policyholders' Funds
Deferred Annuity Products	642.2	641.1
Supplementary Contracts without Life Contingencies	536.6	502.6
Long-term Debt	2,781.5	2,570.2
Other Liabilities
Derivatives	182.5	173.7
Embedded Derivative in Modified Coinsurance Arrangement	107.0	135.7
Unfunded commitment to fund Investment Partnerships	112.2	160.6
Fair Value
Assets
Fixed Maturity Securities	44,744.7	42,486.7
Mortgage Loans	1,868.4	1,789.8
Policy Loans	3,199.6	3,124.4
Other Long-term Investments
Derivatives	108.2	137.7
Equity Securities	13.0	11.2
Miscellaneous Long-term Investments	460.3	436.4
Policyholders' Funds
Deferred Annuity Products	642.2	641.1
Supplementary Contracts without Life Contingencies	536.6	502.6
Long-term Debt	2,928.6	2,540.2
Other Liabilities
Derivatives	182.5	173.7
Embedded Derivative in Modified Coinsurance Arrangement	107.0	135.7
Unfunded commitment to fund Investment Partnerships	$ 112.2	$ 160.6

XML

Accounting Developments - Additional Information (Details) (USD $) In Millions, unless otherwise specified	Jan. 02, 2011
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Impact of Restatement on Opening Stockholders Equity, Net of Tax	$ 459.5

XML

Selected Operating Statement Data by Segment (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Segment Reporting Information [Line Items]
Premium Income	$ 1,929.4	$ 1,881.2	$ 5,778.9	$ 5,625.7
Net Investment Income	619.2	629.2	1,872.2	1,885.0
Other Income	58.1	59.1	174.5	174.8
Operating Revenue	2,606.7	2,569.5	7,825.6	7,685.5
Operating Income (Loss)	310.7	320.6	930.0	986.9
Unum U.S.
Segment Reporting Information [Line Items]
Premium Income	1,111.9	1,074.4	3,338.9	3,213.0
Net Investment Income	236.3	240.0	711.8	712.6
Other Income	31.3	30.4	93.1	90.9
Operating Revenue	1,379.5	1,344.8	4,143.8	4,016.5
Operating Income (Loss)	216.3	209.2	634.9	609.5
Unum U.K.
Segment Reporting Information [Line Items]
Premium Income	175.2	175.5	519.1	518.4
Net Investment Income	34.8	43.3	120.5	139.3
Other Income	0	0	0.1	0.1
Operating Revenue	210.0	218.8	639.7	657.8
Operating Income (Loss)	27.5	34.7	96.3	138.8
Colonial Life
Segment Reporting Information [Line Items]
Premium Income	299.4	283.7	892.6	846.1
Net Investment Income	33.9	32.5	103.5	99.6
Other Income	0	0.1	0.2	0.4
Operating Revenue	333.3	316.3	996.3	946.1
Operating Income (Loss)	68.7	66.7	206.0	205.1
Closed Block
Segment Reporting Information [Line Items]
Premium Income	342.9	347.6	1,028.3	1,048.2
Net Investment Income	307.3	300.1	913.4	888.9
Other Income	26.4	26.4	78.9	80.6
Operating Revenue	676.6	674.1	2,020.6	2,017.7
Operating Income (Loss)	25.6	30.8	66.7	93.1
Corporate
Segment Reporting Information [Line Items]
Premium Income	0	0	0	0
Net Investment Income	6.9	13.3	23.0	44.6
Other Income	0.4	2.2	2.2	2.8
Operating Revenue	7.3	15.5	25.2	47.4
Operating Income (Loss)	$ (27.4)	$ (20.8)	$ (73.9)	$ (59.6)

XML

Impaired Mortgage Loans (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Recorded Investment	$ 21.6	$ 22.5
Unpaid Principal Balance	24.4	24.0
Related Allowance	2.8	1.5
Impaired Fin Receivables with Allowance [Member]
Recorded Investment	17.3	13.1
Unpaid Principal Balance	20.1	14.6
Related Allowance	2.8	1.5
Impaired Fin Receivables with No Related Allowance [Member]
Recorded Investment	4.3	9.4
Unpaid Principal Balance	4.3	9.4
Related Allowance	$ 0	$ 0

XML

Fair Value Measurements by Input Level (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Fixed Maturity Securities
Fixed Maturity Securities	$ 44,744.7	$ 42,486.7
Other Long-term Investments
Derivative Assets	108.2	137.7
Equity Securities	13.0	11.2
Other Liabilities
Derivative Liabilities	289.5	309.4
Interest Rate Swap [Member]
Other Long-term Investments
Derivative Assets	101.3	134.2
Other Liabilities
Derivative Liabilities	33.3	32.9
Foreign Exchange Contracts
Other Long-term Investments
Derivative Assets	6.9	3.5
Other Liabilities
Derivative Liabilities	149.2	140.8
Embedded Derivative in Modified Coinsurance Arrangement
Other Liabilities
Derivative Liabilities	107.0	135.7
United States Government and Government Agencies and Authorities
Fixed Maturity Securities
Fixed Maturity Securities	1,376.4	1,304.4
States, Municipalities, and Political Subdivisions
Fixed Maturity Securities
Fixed Maturity Securities	1,732.6	1,591.6
Foreign Government Debt Securities
Fixed Maturity Securities
Fixed Maturity Securities	1,435.0	1,376.7
Public Utilities
Fixed Maturity Securities
Fixed Maturity Securities	11,053.8	10,633.3
Mortgage/Asset-backed Securities
Fixed Maturity Securities
Fixed Maturity Securities	2,423.6	2,973.2
All Other Corporate Bonds
Fixed Maturity Securities
Fixed Maturity Securities	26,684.4	24,550.1
Redeemable Preferred Stocks
Fixed Maturity Securities
Fixed Maturity Securities	38.9	57.4
Fair Value, Inputs, Level 1 [Member]
Fixed Maturity Securities
Fixed Maturity Securities	6,847.8	4,621.4
Other Long-term Investments
Derivative Assets	0	0
Equity Securities	0	0
Other Liabilities
Derivative Liabilities	0	0
Fair Value, Inputs, Level 1 [Member] | Interest Rate Swap [Member]
Other Long-term Investments
Derivative Assets	0	0
Other Liabilities
Derivative Liabilities	0	0
Fair Value, Inputs, Level 1 [Member] | Foreign Exchange Contracts
Other Long-term Investments
Derivative Assets	0	0
Other Liabilities
Derivative Liabilities	0	0
Fair Value, Inputs, Level 1 [Member] | Embedded Derivative in Modified Coinsurance Arrangement
Other Liabilities
Derivative Liabilities	0	0
Fair Value, Inputs, Level 1 [Member] | United States Government and Government Agencies and Authorities
Fixed Maturity Securities
Fixed Maturity Securities	539.5	326.6
Fair Value, Inputs, Level 1 [Member] | States, Municipalities, and Political Subdivisions
Fixed Maturity Securities
Fixed Maturity Securities	44.0	107.3
Fair Value, Inputs, Level 1 [Member] | Foreign Government Debt Securities
Fixed Maturity Securities
Fixed Maturity Securities	20.6	0
Fair Value, Inputs, Level 1 [Member] | Public Utilities
Fixed Maturity Securities
Fixed Maturity Securities	793.8	718.0
Fair Value, Inputs, Level 1 [Member] | Mortgage/Asset-backed Securities
Fixed Maturity Securities
Fixed Maturity Securities	0	0
Fair Value, Inputs, Level 1 [Member] | All Other Corporate Bonds
Fixed Maturity Securities
Fixed Maturity Securities	5,425.6	3,469.5
Fair Value, Inputs, Level 1 [Member] | Redeemable Preferred Stocks
Fixed Maturity Securities
Fixed Maturity Securities	24.3	0
Fair Value, Inputs, Level 2 [Member]
Fixed Maturity Securities
Fixed Maturity Securities	36,338.6	36,723.9
Other Long-term Investments
Derivative Assets	108.2	137.7
Equity Securities	8.6	0
Other Liabilities
Derivative Liabilities	182.5	173.7
Fair Value, Inputs, Level 2 [Member] | Interest Rate Swap [Member]
Other Long-term Investments
Derivative Assets	101.3	134.2
Other Liabilities
Derivative Liabilities	33.3	32.9
Fair Value, Inputs, Level 2 [Member] | Foreign Exchange Contracts
Other Long-term Investments
Derivative Assets	6.9	3.5
Other Liabilities
Derivative Liabilities	149.2	140.8
Fair Value, Inputs, Level 2 [Member] | Embedded Derivative in Modified Coinsurance Arrangement
Other Liabilities
Derivative Liabilities	0	0
Fair Value, Inputs, Level 2 [Member] | United States Government and Government Agencies and Authorities
Fixed Maturity Securities
Fixed Maturity Securities	836.9	977.8
Fair Value, Inputs, Level 2 [Member] | States, Municipalities, and Political Subdivisions
Fixed Maturity Securities
Fixed Maturity Securities	1,578.5	1,416.2
Fair Value, Inputs, Level 2 [Member] | Foreign Government Debt Securities
Fixed Maturity Securities
Fixed Maturity Securities	1,368.3	1,376.7
Fair Value, Inputs, Level 2 [Member] | Public Utilities
Fixed Maturity Securities
Fixed Maturity Securities	9,760.9	9,576.4
Fair Value, Inputs, Level 2 [Member] | Mortgage/Asset-backed Securities
Fixed Maturity Securities
Fixed Maturity Securities	2,415.2	2,941.5
Fair Value, Inputs, Level 2 [Member] | All Other Corporate Bonds
Fixed Maturity Securities
Fixed Maturity Securities	20,364.2	20,415.1
Fair Value, Inputs, Level 2 [Member] | Redeemable Preferred Stocks
Fixed Maturity Securities
Fixed Maturity Securities	14.6	20.2
Fair Value, Inputs, Level 3 [Member]
Fixed Maturity Securities
Fixed Maturity Securities	1,558.3	1,141.4
Other Long-term Investments
Derivative Assets	0	0
Equity Securities	4.4	11.2
Other Liabilities
Derivative Liabilities	107.0	135.7
Fair Value, Inputs, Level 3 [Member] | Interest Rate Swap [Member]
Other Long-term Investments
Derivative Assets	0	0
Other Liabilities
Derivative Liabilities	0	0
Fair Value, Inputs, Level 3 [Member] | Foreign Exchange Contracts
Other Long-term Investments
Derivative Assets	0	0
Other Liabilities
Derivative Liabilities	0	0
Fair Value, Inputs, Level 3 [Member] | Embedded Derivative in Modified Coinsurance Arrangement
Other Liabilities
Derivative Liabilities	107.0	135.7
Fair Value, Inputs, Level 3 [Member] | United States Government and Government Agencies and Authorities
Fixed Maturity Securities
Fixed Maturity Securities	0	0
Fair Value, Inputs, Level 3 [Member] | States, Municipalities, and Political Subdivisions
Fixed Maturity Securities
Fixed Maturity Securities	110.1	68.1
Fair Value, Inputs, Level 3 [Member] | Foreign Government Debt Securities
Fixed Maturity Securities
Fixed Maturity Securities	46.1	0
Fair Value, Inputs, Level 3 [Member] | Public Utilities
Fixed Maturity Securities
Fixed Maturity Securities	499.1	338.9
Fair Value, Inputs, Level 3 [Member] | Mortgage/Asset-backed Securities
Fixed Maturity Securities
Fixed Maturity Securities	8.4	31.7
Fair Value, Inputs, Level 3 [Member] | All Other Corporate Bonds
Fixed Maturity Securities
Fixed Maturity Securities	894.6	665.5
Fair Value, Inputs, Level 3 [Member] | Redeemable Preferred Stocks
Fixed Maturity Securities
Fixed Maturity Securities	$ 0	$ 37.2

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Transfers of Assets between Level 1 and Level 2 (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Fixed Maturity Securities
Level 1 from Level 2	$ 3,026.8	$ 2,641.0	$ 3,570.8	$ 3,239.8
Level 2 from Level 1	2,534.4	3,078.1	2,284.9	2,523.5
United States Government and Government Agencies and Authorities
Fixed Maturity Securities
Level 1 from Level 2	426.8	177.2	205.9	169.8
Level 2 from Level 1	60.5	16.1	20.5	0
States, Municipalities, and Political Subdivisions
Fixed Maturity Securities
Level 1 from Level 2	43.0	0	41.9	25.4
Level 2 from Level 1	62.9	20.0	74.8	301.9
Foreign Government Debt Securities
Fixed Maturity Securities
Level 1 from Level 2	21.7	0	20.7	0
Level 2 from Level 1	0	0	0	0.7
Public Utilities
Fixed Maturity Securities
Level 1 from Level 2	382.4	665.7	479.0	710.5
Level 2 from Level 1	743.6	694.8	483.6	488.6
All Other Corporate Bonds
Fixed Maturity Securities
Level 1 from Level 2	2,152.9	1,798.1	2,823.3	2,334.1
Level 2 from Level 1	1,667.4	2,347.2	1,706.0	1,732.3
Equity Securities
Fixed Maturity Securities
Level 1 from Level 2	0		0
Level 2 from Level 1	$ 7.4		$ 0

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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Parenthetical) (Retained Earnings, USD $)	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Retained Earnings
Dividends to Stockholders, per common share	$ 0.34	$ 0.290

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Changes in Assets and Liabilities Measured at Fair Value on a Recurring Basis using Significant Unobservable Inputs (Level 3) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning of Year	$ 825.2	$ 788.5	$ 1,141.4	$ 1,025.7
Earnings	0	0.1	(1.0)	(2.0)
Other Comprehensive Income or Loss	31.9	9.6	45.4	21.4
Purchases	0	30.0	40.8	91.1
Sales	(7.0)	(29.5)	(67.4)	(48.3)
Level 3 Transfers Into	887.5	339.8	893.8	395.9
Level 3 Transfers Out of	(179.3)	(234.6)	(494.7)	(579.9)
End of Year	1,558.3	903.9	1,558.3	903.9
States, Municipalities, and Political Subdivisions
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning of Year	0		68.1
Earnings	0		0
Other Comprehensive Income or Loss	2.0		(0.9)
Purchases	0		0
Sales	0		(0.3)
Level 3 Transfers Into	108.1		43.2
Level 3 Transfers Out of	0		0
End of Year	110.1		110.1
Foreign Government Debt Securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning of Year	0		0
Earnings	0		0
Other Comprehensive Income or Loss	1.3		5.2
Purchases	0		0
Sales	0		0
Level 3 Transfers Into	44.8		40.9
Level 3 Transfers Out of	0		0
End of Year	46.1		46.1
Public Utilities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning of Year	162.8	217.9	338.9	173.6
Earnings	0	0.1	0	0.1
Other Comprehensive Income or Loss	8.4	9.3	5.4	17.1
Purchases	0	30.0	3.6	30.0
Sales	(1.7)	(11.9)	(3.7)	(15.7)
Level 3 Transfers Into	340.5	220.2	361.7	299.7
Level 3 Transfers Out of	(10.9)	(69.8)	(206.8)	(109.0)
End of Year	499.1	395.8	499.1	395.8
Mortgage/Asset-backed Securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning of Year	0.6	19.7	31.7	0.7
Earnings	0	0	0	0
Other Comprehensive Income or Loss	0.4	(0.1)	0.9	(0.4)
Purchases	0	0	7.0	19.4
Sales	0	0	(0.1)	(0.1)
Level 3 Transfers Into	7.4	0	0	0
Level 3 Transfers Out of	0	0	(31.1)	0
End of Year	8.4	19.6	8.4	19.6
All Other Corporate Bonds
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning of Year	639.6	528.3	665.5	829.7
Earnings	0	0	0	(2.1)
Other Comprehensive Income or Loss	19.8	1.3	34.0	4.7
Purchases	0	0	30.2	41.7
Sales	(5.3)	(17.6)	(49.0)	(32.5)
Level 3 Transfers Into	386.7	119.6	448.0	96.2
Level 3 Transfers Out of	(146.2)	(164.8)	(234.1)	(470.9)
End of Year	894.6	466.8	894.6	466.8
Redeemable Preferred Stocks
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning of Year	22.2	22.6	37.2	21.7
Earnings	0	0	(1.0)	0
Other Comprehensive Income or Loss	0	(0.9)	0.8	0
Purchases	0	0	0	0
Sales	0	0	(14.3)	0
Level 3 Transfers Into	0	0	0	0
Level 3 Transfers Out of	(22.2)	0	(22.7)	0
End of Year	0	21.7	0	21.7
Equity Securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning of Year	4.4	3.6	11.2	1.5
Earnings	0	(0.4)	0	(0.4)
Other Comprehensive Income or Loss	0	(2.4)	0	(1.7)
Purchases	0	0	0	2.0
Sales	0	0	(0.1)	0
Level 3 Transfers Into	0	9.6	0	9.0
Level 3 Transfers Out of	0	0	(6.7)	0
End of Year	4.4	10.4	4.4	10.4
Embedded Derivative in Modified Coinsurance Arrangement
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning of Year	(126.7)	(87.0)	(135.7)	(96.3)
Earnings	19.7	(33.7)	28.7	(24.4)
Other Comprehensive Income or Loss	0	0	0	0
Purchases	0	0	0	0
Sales	0	0	0	0
Level 3 Transfers Into	0	0	0	0
Level 3 Transfers Out of	0	0	0	0
End of Year	$ (107.0)	$ (120.7)	$ (107.0)	$ (120.7)

XML

Mortgage Loans by Geographic Region (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans	$ 1,665.2	$ 1,612.3
Percent of Total	100.00%	100.00%
New England
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans	132.4	147.0
Percent of Total	8.00%	9.10%
Mid-Atlantic
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans	161.2	174.1
Percent of Total	9.70%	10.80%
East North Central
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans	212.1	212.7
Percent of Total	12.70%	13.20%
West North Central
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans	147.3	151.2
Percent of Total	8.80%	9.40%
South Atlantic
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans	418.6	383.8
Percent of Total	25.20%	23.80%
East South Central
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans	80.1	52.4
Percent of Total	4.80%	3.30%
West South Central
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans	173.1	160.4
Percent of Total	10.40%	9.90%
Mountain
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans	81.9	69.5
Percent of Total	4.90%	4.30%
Pacific
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans	$ 258.5	$ 261.2
Percent of Total	15.50%	16.20%

XML

Derivative Financial Instruments - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Jun. 30, 2012	Dec. 31, 2011	Jun. 30, 2011	Dec. 31, 2010
Derivative [Line Items]
Current credit exposure on derivatives	$ 9,800,000		$ 9,800,000
Cash collateral from counterparties	15,300,000		15,300,000			45,600,000
Carrying value of fixed maturity securities posted as collateral to our counterparties	129,400,000		129,400,000			114,900,000
Cash Collateral to counterparties	0		0			0
Aggregate fair value of all derivative instruments with credit risk-related contingent features in a liability position	182,500,000		182,500,000			173,700,000
Notional Amount of forward starting interest rate swaps	200,000,000		200,000,000			335,000,000
Notional amount of foreign currency cash flow hedges	514,200,000		514,200,000			554,000,000
Notional Amount of Derivatives	1,513,200,000	1,498,700,000	1,513,200,000	1,498,700,000	1,309,500,000	1,413,000,000	1,538,700,000	1,681,900,000
Notional Amount Of Derivatives Terminations	71,300,000	55,000,000	230,800,000	230,100,000
Gain (Loss) Recognized in OCI on Derivatives (Effective Portion)	5,500,000	59,400,000	50,200,000	76,300,000
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net	0	0	0	0
Approximate amount of net deferred gains on derivative instruments expected to be amortized during the next twelve months			39,800,000
Forward Contracts [Member]
Derivative [Line Items]
Notional Amount of Derivatives	25,000,000	15,000,000	25,000,000	15,000,000	0	0	0	0
Notional Amount Of Derivatives Terminations	0	0	56,000,000	31,900,000
Receive Variable/Pay Fixed | Swaps
Derivative [Line Items]
Notional Amount of Derivatives	174,000,000	174,000,000	174,000,000	174,000,000	174,000,000	174,000,000	174,000,000	174,000,000
Notional Amount Of Derivatives Terminations	0	0	0	0
Notional amount of receive variable, pay fixed interest rate swaps to hedge changes in fair value of certain fixed rate securities held	174,000,000		174,000,000			174,000,000
Hedged benchmark interest rate, on the related interest rate swaps	200,000	7,600,000	400,000	8,700,000
Receive Fixed/Pay Variable | Swaps
Derivative [Line Items]
Notional Amount of Derivatives	800,000,000	735,000,000	800,000,000	735,000,000	595,000,000	685,000,000	785,000,000	890,000,000
Notional Amount Of Derivatives Terminations	45,000,000	50,000,000	135,000,000	155,000,000
Hedged benchmark interest rate, on the related interest rate swaps	4,100,000	14,800,000	8,300,000	22,000,000
Notional Amount of receive fixed, pay variable interest rate swap	600,000,000		600,000,000			350,000,000
Notional Amount of Interest Rate Derivatives	$ 250,000,000		$ 250,000,000

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CONSOLIDATED BALANCE SHEETS (USD $) In Millions, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Investments
Fixed Maturity Securities - at fair value (amortized cost: $37,457.3; $36,640.7)	$ 44,744.7	$ 42,486.7
Mortgage Loans	1,665.2	1,612.3
Policy Loans	3,117.0	3,051.4
Other Long-term Investments	650.9	639.2
Short-term Investments	1,590.2	1,423.5
Total Investments	51,768.0	49,213.1
Other Assets
Cash and Bank Deposits	53.6	116.6
Accounts and Premiums Receivable	1,704.9	1,672.2
Reinsurance Recoverable	4,824.7	4,854.6
Accrued Investment Income	696.8	681.8
Deferred Acquisition Costs	1,728.3	1,677.1
Goodwill	201.6	201.2
Property and Equipment	497.7	493.3
Other Assets	644.0	645.3
Total Assets	62,119.6	59,555.2
Liabilities
Policy and Contract Benefits	1,442.8	1,494.0
Reserves for Future Policy and Contract Benefits	44,537.7	43,051.9
Unearned Premiums	497.2	433.2
Other Policyholders' Funds	1,629.4	1,625.9
Income Tax Payable	47.5	38.2
Deferred Income Tax	347.2	44.7
Short-term Debt	458.3	312.3
Long-term Debt	2,781.5	2,570.2
Other Liabilities	1,704.7	1,815.1
Total Liabilities	53,446.3	51,385.5
Commitments and Contingent Liabilities - Note 9
Stockholders' Equity
Common Stock, $0.10 par, Authorized: 725,000,000 shares Issued: 359,705,527 and 358,691,567 shares	36.0	35.9
Additional Paid-in Capital	2,604.2	2,591.1
Accumulated Other Comprehensive Income (Loss)
Net Unrealized Gain on Securities Not Other-Than-Temporarily Impaired	892.2	614.8
Net Gain on Cash Flow Hedges	400.3	408.7
Foreign Currency Translation Adjustment	(78.6)	(117.6)
Unrecognized Pension and Postretirement Benefit Costs	(423.6)	(444.1)
Retained Earnings	7,173.4	6,611.0
Treasury Stock - at cost: 84,620,240 shares and 65,975,613 shares	(1,930.6)	(1,530.1)
Total Stockholders' Equity	8,673.3	8,169.7
Total Liabilities and Stockholders' Equity	$ 62,119.6	$ 59,555.2

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Investments Mortgage Loan Restructuring (Detail) (Commercial Real Estate Portfolio Segment [Member])	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Carrying Amount	13.1	9.8
Financing Receivables, modifications, number of contracts	2	1

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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Change in Net Unrealized Gain on Securities Not Other-Than-Temporarily Impaired, tax expense	$ 303.1	$ 599.6	$ 496.5	$ 754.9
Change in Net Unrealized Gain on Securities Other-Than-Temporarily Impaired, tax benefit	0	0	0	1.1
Total Change in Net Unrealized Gain on Securities Before Reclassification Adjustment, tax expense	303.1	599.6	496.5	753.8
Reclassification Adjustment for Net Realized Investment Gain, tax expense	1.4	3.4	2.0	4.6
Change in Net Gain on Cash Flow Hedges, tax expense (benefit)	(6.0)	34.7	(5.3)	32.0
Change in Adjustment to Reserves for Future Policy and Contract Benefits Net of Reinsurance and Other, tax benefit	213.5	377.6	344.0	498.8
Change in Unrecognized Pension and Postretirement Benefit Costs, tax expense	$ 3.5	$ 2.8	$ 11.0	$ 6.9

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Pensions and Other Postretirement Benefits - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2012
Pension Benefits, U.S. Plans
Pension and Other Postretirement Benefits Disclosure [Line Items]
Defined Benefit Plan, Contributions by Employer		$ 53.0
United Kingdom, Pounds
Pension and Other Postretirement Benefits Disclosure [Line Items]
Defined Benefit Plan, Contributions by Employer	0.7	2.0
Pension Benefits, Non U.S. Plans
Pension and Other Postretirement Benefits Disclosure [Line Items]
Defined Benefit Plan, Contributions by Employer	$ 1.0	$ 3.1

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Amortized Cost and Fair Values of Securities by Security Type (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost	$ 37,457.3	$ 36,640.7
Gross Unrealized Gain	7,378.4	6,068.2
Gross Unrealized Loss	91.0	222.2
Fixed Maturity Securities	44,744.7	42,486.7
United States Government and Government Agencies and Authorities
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost	1,031.5	1,005.8
Gross Unrealized Gain	345.8	299.7
Gross Unrealized Loss	0.9	1.1
Fixed Maturity Securities	1,376.4	1,304.4
States, Municipalities, and Political Subdivisions
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost	1,423.7	1,377.8
Gross Unrealized Gain	316.0	222.6
Gross Unrealized Loss	7.1	8.8
Fixed Maturity Securities	1,732.6	1,591.6
Foreign Government Debt Securities
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost	1,209.6	1,139.4
Gross Unrealized Gain	225.4	237.3
Gross Unrealized Loss	0	0
Fixed Maturity Securities	1,435.0	1,376.7
Public Utilities
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost	9,172.9	9,015.7
Gross Unrealized Gain	1,903.2	1,646.2
Gross Unrealized Loss	22.3	28.6
Fixed Maturity Securities	11,053.8	10,633.3
Mortgage/Asset-backed Securities
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost	2,105.3	2,634.6
Gross Unrealized Gain	318.8	344.1
Gross Unrealized Loss	0.5	5.5
Fixed Maturity Securities	2,423.6	2,973.2
All Other Corporate Bonds
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost	22,481.3	21,411.6
Gross Unrealized Gain	4,263.3	3,314.8
Gross Unrealized Loss	60.2	176.3
Fixed Maturity Securities	26,684.4	24,550.1
Redeemable Preferred Stocks
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost	33.0	55.8
Gross Unrealized Gain	5.9	3.5
Gross Unrealized Loss	0	1.9
Fixed Maturity Securities	$ 38.9	$ 57.4

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Investments (Tables)

9 Months Ended

Sep. 30, 2012

Notes to Financial Statements [Abstract]

Schedule of Available-for-sale Securities Reconciliation

At September 30, 2012 and December 31, 2011, 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, 2012
	(in millions of dollars)
	Amortized Cost		Gross Unrealized Gain		Gross Unrealized Loss		Fair Value
United States Government and Government Agencies and Authorities	$	1,031.5	$	345.8	$	0.9	$	1,376.4
States, Municipalities, and Political Subdivisions	1,423.7		316.0		7.1		1,732.6
Foreign Governments	1,209.6		225.4		—		1,435.0
Public Utilities	9,172.9		1,903.2		22.3		11,053.8
Mortgage/Asset-Backed Securities	2,105.3		318.8		0.5		2,423.6
All Other Corporate Bonds	22,481.3		4,263.3		60.2		26,684.4
Redeemable Preferred Stocks	33.0		5.9		—		38.9
Total Fixed Maturity Securities	$	37,457.3	$	7,378.4	$	91.0	$	44,744.7

	December 31, 2011
	(in millions of dollars)
	Amortized Cost		Gross Unrealized Gain		Gross Unrealized Loss		Fair Value
United States Government and Government Agencies and Authorities	$	1,005.8	$	299.7	$	1.1	$	1,304.4
States, Municipalities, and Political Subdivisions	1,377.8		222.6		8.8		1,591.6
Foreign Governments	1,139.4		237.3		—		1,376.7
Public Utilities	9,015.7		1,646.2		28.6		10,633.3
Mortgage/Asset-Backed Securities	2,634.6		344.1		5.5		2,973.2
All Other Corporate Bonds	21,411.6		3,314.8		176.3		24,550.1
Redeemable Preferred Stocks	55.8		3.5		1.9		57.4
Total Fixed Maturity Securities	$	36,640.7	$	6,068.2	$	222.2	$	42,486.7

As of September 30, 2012 and December 31, 2011, we held no fixed maturity securities for which a portion of an other-than-temporary impairment had previously been recognized in other comprehensive income.

Length of Time Fixed Maturity Securities had been in a Gross Unrealized Loss Position

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

	September 30, 2012
	(in millions of dollars)
	Less Than 12 Months				12 Months or Greater
	Fair Value		Gross Unrealized Loss		Fair Value		Gross Unrealized Loss
United States Government and Government Agencies and Authorities	$	—	$	—	$	6.6	$	0.9
States, Municipalities, and Political Subdivisions	1.6		—		42.3		7.1
Public Utilities	109.3		7.5		160.2		14.8
Mortgage/Asset-Backed Securities	—		—		8.3		0.5
All Other Corporate Bonds	292.3		11.8		571.4		48.4
Total Fixed Maturity Securities	$	403.2	$	19.3	$	788.8	$	71.7

	December 31, 2011
	(in millions of dollars)
	Less Than 12 Months				12 Months or Greater
	Fair Value		Gross Unrealized Loss		Fair Value		Gross Unrealized Loss
United States Government and Government Agencies and Authorities	$	—	$	—	$	6.3	$	1.1
States, Municipalities, and Political Subdivisions	51.6		1.3		75.3		7.5
Public Utilities	192.0		7.9		142.2		20.7
Mortgage/Asset-Backed Securities	94.2		4.8		19.6		0.7
All Other Corporate Bonds	1,703.9		65.5		684.9		110.8
Redeemable Preferred Stocks	—		—		20.9		1.9
Total Fixed Maturity Securities	$	2,041.7	$	79.5	$	949.2	$	142.7

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, 2012
	(in millions of dollars)
	Total Amortized Cost		Unrealized Gain Position				Unrealized Loss Position
			Gross Gain		Fair Value		Gross Loss		Fair Value
1 year or less	$	990.2	$	23.4	$	988.7	$	0.1	$	24.8
Over 1 year through 5 years	5,613.8		590.6		6,014.8		7.6		182.0
Over 5 years through 10 years	9,776.2		1,623.1		11,051.4		17.0		330.9
Over 10 years	18,971.8		4,822.5		23,082.5		65.8		646.0
	35,352.0		7,059.6		41,137.4		90.5		1,183.7
Mortgage/Asset-Backed Securities	2,105.3		318.8		2,415.3		0.5		8.3
Total Fixed Maturity Securities	$	37,457.3	$	7,378.4	$	43,552.7	$	91.0	$	1,192.0

Note 4 - Investments - Continued

	December 31, 2011
	(in millions of dollars)
	Total Amortized Cost		Unrealized Gain Position				Unrealized Loss Position
			Gross Gain		Fair Value		Gross Loss		Fair Value
1 year or less	$	715.1	$	16.0	$	701.4	$	0.1	$	29.6
Over 1 year through 5 years	5,161.5		449.8		4,949.0		20.7		641.6
Over 5 years through 10 years	9,630.5		1,266.3		9,903.8		52.8		940.2
Over 10 years	18,499.0		3,992.0		21,082.2		143.1		1,265.7
	34,006.1		5,724.1		36,636.4		216.7		2,877.1
Mortgage/Asset-Backed Securities	2,634.6		344.1		2,859.4		5.5		113.8
Total Fixed Maturity Securities	$	36,640.7	$	6,068.2	$	39,495.8	$	222.2	$	2,990.9

Credit Losses Remaining in Retained Earnings Related to Adoption of Accounting Standard

The following table presents the before-tax credit related portion of other-than-temporary impairments on fixed maturity securities still held for which a portion of an other-than-temporary impairment was recognized in other comprehensive income. The fixed maturity security to which the impairment pertained was sold during the three months ended March 31, 2011. We held no fixed maturity securities during the three months ended September 30, 2011, as of the beginning of 2012, or during the nine months ended September 30, 2012 for which a portion of an other-than-temporary impairment was previously recognized in other comprehensive income.

	Nine Months Ended
	September 30, 2011
	(in millions of dollars)
Balance at Beginning of Year	$	8.5
Sales or Maturities of Securities	(8.5		)
Balance at End of Period	$	—

Mortgage Loans by Property Type

Mortgage loans by property type and geographic region are as follows:

	September 30, 2012				December 31, 2011
	Carrying		Percent of		Carrying		Percent of
	Amount		Total		Amount		Total
	(in millions of dollars)
Property Type
Apartment	$	34.3	2.1	%	$	28.0	1.8	%
Industrial	528.4		31.7		502.0		31.1
Mixed	78.9		4.7		93.5		5.8
Office	677.1		40.7		659.3		40.9
Retail	346.5		20.8		322.4		20.0
Other	—		—		7.1		0.4
Total	$	1,665.2	100.0	%	$	1,612.3	100.0	%

Mortgage Loans by Geographic Region

Region
New England	$	132.4	8.0	%	$	147.0	9.1	%
Mid-Atlantic	161.2		9.7		174.1		10.8
East North Central	212.1		12.7		212.7		13.2
West North Central	147.3		8.8		151.2		9.4
South Atlantic	418.6		25.2		383.8		23.8
East South Central	80.1		4.8		52.4		3.3
West South Central	173.1		10.4		160.4		9.9
Mountain	81.9		4.9		69.5		4.3
Pacific	258.5		15.5		261.2		16.2
Total	$	1,665.2	100.0	%	$	1,612.3	100.0	%

Mortgage Loans, Sorted by Applicable Credit Quality Indicators, Internal Rating

Mortgage loans, sorted by the applicable credit quality indicators, are as follows:

	September 30		December 31
	2012		2011
	(in millions of dollars)
Internal Rating
Aa	$	11.7	$	10.9
A	655.8		712.6
Baa	951.0		855.0
Ba	29.4		20.7
B	17.3		13.1
Total	$	1,665.2	$	1,612.3

Mortgage Loans by Applicable Credit Quality Indicators Loan to Value Ratio

Loan-to-Value Ratio
<= 65%	$	648.6	$	578.4
> 65% <= 75%	781.9		802.3
> 75% <= 85%	186.8		165.1
> 85% <= 100%	47.9		66.5
Total	$	1,665.2	$	1,612.3

Activity in the Allowance for Credit Losses

The activity in the allowance for credit losses is as follows:

	Three Months Ended September 30				Nine Months Ended September 30
	2012		2011		2012			2011
	(in millions of dollars)
Balance at Beginning of Period	$	1.5	$	1.5	$	1.5		$	1.5
Provision	1.3		—		1.8			—
Charge-offs, Net of Recoveries	—		—		(0.5		)	—
Balance at End of Period	$	2.8	$	1.5	$	2.8		$	1.5

Impaired Mortgage Loans

Impaired mortgage loans are as follows:

	September 30, 2012
	(in millions of dollars)
			Unpaid
	Recorded		Principal		Related
	Investment		Balance		Allowance
With No Related Allowance Recorded	$	4.3	$	4.3	$	—
With an Allowance Recorded	17.3		20.1		2.8
Total	$	21.6	$	24.4	$	2.8
	December 31, 2011
	(in millions of dollars)
			Unpaid
	Recorded		Principal		Related
	Investment		Balance		Allowance
With No Related Allowance Recorded	$	9.4	$	9.4	$	—
With an Allowance Recorded	13.1		14.6		1.5
Total	$	22.5	$	24.0	$	1.5

Troubled Debt Restructurings

We had no troubled debt restructurings during the three months ended September 30, 2012 and 2011. Our troubled debt restructurings during the nine months ended September 30, 2012 and 2011 were comprised entirely of loan foreclosures. A summary of our troubled debt restructurings is as follows:

	Nine Months Ended September 30
	2012		2011
	(in millions of dollars)
Carrying Amount	$	13.1	$	9.8
Number of Loans	2		1

We had no realized losses on loan foreclosures during the nine months ended September 30, 2012 and 2011 other than the initial impairment losses realized prior to foreclosure.

Realized Investment Gains and Losses Reported in Consolidated Statements of Income

Realized Investment Gain and Loss

Realized investment gains and losses reported in our consolidated statements of income are as follows:

	Three Months Ended September 30						Nine Months Ended September 30
	2012			2011			2012			2011
	(in millions of dollars)
Fixed Maturity Securities
Gross Gains on Sales	$	4.6		$	14.8		$	14.0		$	33.0
Gross Losses on Sales	(2.3		)	(5.4		)	(9.0		)	(22.1		)
Other-Than-Temporary Impairment Loss	—			(1.2		)	—			(4.2		)
Mortgage Loans and Other Invested Assets
Gross Gains on Sales	2.3			1.6			2.3			7.1
Gross Losses on Sales	—			—			—			(0.2		)
Impairment Loss	(1.3		)	(0.4		)	(1.8		)	(0.4		)
Embedded Derivative in Modified Coinsurance Arrangement	19.7			(33.7		)	28.7			(24.4		)
Foreign Currency Transactions	(1.7		)	0.4			(2.6		)	(1.1		)
Net Realized Investment Gain (Loss)	$	21.3		$	(23.9	)	$	31.6		$	(12.3	)

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Length of Time Fixed Maturity Securities had been in a Gross Unrealized Loss Position (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Schedule of Available-for-sale Securities [Line Items]
Less Than 12 Months Fair Value	$ 403.2	$ 2,041.7
Less than 12 Months Gross Unrealized Loss	19.3	79.5
12 Months or Greater Fair Value	788.8	949.2
12 Months or Greater Gross Unrealized Loss	71.7	142.7
United States Government and Government Agencies and Authorities
Schedule of Available-for-sale Securities [Line Items]
Less Than 12 Months Fair Value	0	0
Less than 12 Months Gross Unrealized Loss	0	0
12 Months or Greater Fair Value	6.6	6.3
12 Months or Greater Gross Unrealized Loss	0.9	1.1
States, Municipalities, and Political Subdivisions
Schedule of Available-for-sale Securities [Line Items]
Less Than 12 Months Fair Value	1.6	51.6
Less than 12 Months Gross Unrealized Loss	0	1.3
12 Months or Greater Fair Value	42.3	75.3
12 Months or Greater Gross Unrealized Loss	7.1	7.5
Public Utilities
Schedule of Available-for-sale Securities [Line Items]
Less Than 12 Months Fair Value	109.3	192.0
Less than 12 Months Gross Unrealized Loss	7.5	7.9
12 Months or Greater Fair Value	160.2	142.2
12 Months or Greater Gross Unrealized Loss	14.8	20.7
Mortgage/Asset-backed Securities
Schedule of Available-for-sale Securities [Line Items]
Less Than 12 Months Fair Value	0	94.2
Less than 12 Months Gross Unrealized Loss	0	4.8
12 Months or Greater Fair Value	8.3	19.6
12 Months or Greater Gross Unrealized Loss	0.5	0.7
All Other Corporate Bonds
Schedule of Available-for-sale Securities [Line Items]
Less Than 12 Months Fair Value	292.3	1,703.9
Less than 12 Months Gross Unrealized Loss	11.8	65.5
12 Months or Greater Fair Value	571.4	684.9
12 Months or Greater Gross Unrealized Loss	48.4	110.8
Redeemable Preferred Stocks
Schedule of Available-for-sale Securities [Line Items]
Less Than 12 Months Fair Value		0
Less than 12 Months Gross Unrealized Loss		0
12 Months or Greater Fair Value		20.9
12 Months or Greater Gross Unrealized Loss		$ 1.9

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Segment Information (Tables)

9 Months Ended

Sep. 30, 2012

Segment Reporting [Abstract]

Reconciliation of Total Operating Revenue and Operating Income by Segment to Revenue and Net Income

A reconciliation of total operating revenue and operating income by segment to revenue and net income as reported in our consolidated statements of income follows:

	Three Months Ended September 30						Nine Months Ended September 30
	2012			2011			2012			2011
	(in millions of dollars)
Operating Revenue by Segment	$	2,606.7		$	2,569.5		$	7,825.6		$	7,685.5
Net Realized Investment Gain (Loss)	21.3			(23.9		)	31.6			(12.3		)
Revenue	$	2,628.0		$	2,545.6		$	7,857.2		$	7,673.2
Operating Income by Segment	$	310.7		$	320.6		$	930.0		$	986.9
Net Realized Investment Gain (Loss)	21.3			(23.9		)	31.6			(12.3		)
Non-operating Retirement-related Loss	(11.6		)	(8.0		)	(34.8		)	(24.0		)
Income Tax	(90.2		)	(86.7		)	(266.3		)	(297.4		)
Net Income	$	230.2		$	202.0		$	660.5		$	653.2

Premium Income by Major Line of Business within Each Segment

Premium income by major line of business within each of our segments is presented as follows:

	Three Months Ended September 30					Nine Months Ended September 30
	2012		2011			2012		2011
	(in millions of dollars)
Unum US
Group Disability
Group Long-term Disability	$	392.4	$	393.7		$	1,185.7	$	1,185.3
Group Short-term Disability	120.1		115.2			356.0		339.0
Group Life and Accidental Death & Dismemberment
Group Life	297.3		277.6			885.1		825.3
Accidental Death & Dismemberment	29.2		27.7			86.2		81.6
Supplemental and Voluntary
Individual Disability - Recently Issued	119.9		116.6			357.0		348.3
Voluntary Benefits	153.0		143.6			468.9		433.5
	1,111.9		1,074.4			3,338.9		3,213.0
Unum UK
Group Long-term Disability	102.9		107.3			306.5		318.3
Group Life	56.4		52.1			164.6		151.6
Supplemental and Voluntary	15.9		16.1			48.0		48.5
	175.2		175.5			519.1		518.4
Colonial Life
Accident, Sickness, and Disability	181.8		174.3			541.8		519.7
Life	52.2		47.0			156.3		140.0
Cancer and Critical Illness	65.4		62.4			194.5		186.4
	299.4		283.7			892.6		846.1
Closed Block
Individual Disability	183.1		196.4			554.9		595.0
Long-term Care	159.4		152.1			471.5		453.5
All Other	0.4		(0.9		)	1.9		(0.3		)
	342.9		347.6			1,028.3		1,048.2
Total	$	1,929.4	$	1,881.2		$	5,778.9	$	5,625.7

Selected Operating Statement Data by Segment

Selected operating statement data by segment is presented as follows:

	Unum US		Unum UK		Colonial Life		Closed Block		Corporate			Total
	(in millions of dollars)
Three Months Ended September 30, 2012
Premium Income	$	1,111.9	$	175.2	$	299.4	$	342.9	$	—		$	1,929.4
Net Investment Income	236.3		34.8		33.9		307.3		6.9			619.2
Other Income	31.3		—		—		26.4		0.4			58.1
Operating Revenue	$	1,379.5	$	210.0	$	333.3	$	676.6	$	7.3		$	2,606.7
Operating Income (Loss)	$	216.3	$	27.5	$	68.7	$	25.6	$	(27.4	)	$	310.7
Three Months Ended September 30, 2011
Premium Income	$	1,074.4	$	175.5	$	283.7	$	347.6	$	—		$	1,881.2
Net Investment Income	240.0		43.3		32.5		300.1		13.3			629.2
Other Income	30.4		—		0.1		26.4		2.2			59.1
Operating Revenue	$	1,344.8	$	218.8	$	316.3	$	674.1	$	15.5		$	2,569.5
Operating Income (Loss)	$	209.2	$	34.7	$	66.7	$	30.8	$	(20.8	)	$	320.6
Nine Months Ended September 30, 2012
Premium Income	$	3,338.9	$	519.1	$	892.6	$	1,028.3	$	—		$	5,778.9
Net Investment Income	711.8		120.5		103.5		913.4		23.0			1,872.2
Other Income	93.1		0.1		0.2		78.9		2.2			174.5
Operating Revenue	$	4,143.8	$	639.7	$	996.3	$	2,020.6	$	25.2		$	7,825.6
Operating Income (Loss)	$	634.9	$	96.3	$	206.0	$	66.7	$	(73.9	)	$	930.0
Nine Months Ended September 30, 2011
Premium Income	$	3,213.0	$	518.4	$	846.1	$	1,048.2	$	—		$	5,625.7
Net Investment Income	712.6		139.3		99.6		888.9		44.6			1,885.0
Other Income	90.9		0.1		0.4		80.6		2.8			174.8
Operating Revenue	$	4,016.5	$	657.8	$	946.1	$	2,017.7	$	47.4		$	7,685.5
Operating Income (Loss)	$	609.5	$	138.8	$	205.1	$	93.1	$	(59.6	)	$	986.9

Assets by Segment

Assets by segment are as follows:

	September 30		December 31
	2012		2011
	(in millions of dollars)
Unum US	$	19,135.0	$	18,583.6
Unum UK	3,945.4		3,549.5
Colonial Life	3,357.9		3,167.8
Closed Block	32,718.9		31,439.5
Corporate	2,962.4		2,814.8
Total	$	62,119.6	$	59,555.2

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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (USD $) In Millions	Total	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Income	Retained Earnings	Treasury Stock
Balance at Beginning of Year at Dec. 31, 2010		$ 36.5	$ 2,615.4	$ 351.4	$ 6,591.8	$ (1,110.2)
Common Stock Activity		0.1	20.7
Retirement of Repurchased Common Shares		(0.8)	(55.2)		(144.0)
All Other Changes During Year	547.1			547.1
Net Income	653.2				653.2
Dividends to Stockholders (per common share: $0.34; $0.29)					(90.3)
Purchases of Treasury Stock						(419.9)
Balance at End of Period at Sep. 30, 2011	8,995.8	35.8	2,580.9	898.5	7,010.7	(1,530.1)
Balance at Beginning of Year at Dec. 31, 2011	8,169.7	35.9	2,591.1	461.8	6,611.0	(1,530.1)
Common Stock Activity		0.1	13.1
Retirement of Repurchased Common Shares		0	0		0
All Other Changes During Year	328.5			328.5
Net Income	660.5				660.5
Dividends to Stockholders (per common share: $0.34; $0.29)					(98.1)
Purchases of Treasury Stock	(400.5)					(400.5)
Balance at End of Period at Sep. 30, 2012	$ 8,673.3	$ 36.0	$ 2,604.2	$ 790.3	$ 7,173.4	$ (1,930.6)

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CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Millions, except Share data, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Investments [Abstract]
Fixed Maturity Securities, Amortized Cost	$ 37,457.3	$ 36,640.7
Stockholders' Equity
Common Stock, Par	$ 0.10	$ 0.10
Common Stock, Authorized	725,000,000	725,000,000
Common Stock, Issued	359,705,527	358,691,567
Treasury Stock, Shares	84,620,240	65,975,613

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Stockholders' Equity and Earnings Per Common Share

9 Months Ended

Sep. 30, 2012

Disclosure Text Block [Abstract]

Stockholders' Equity and Earnings Per Common Share

Stockholders' Equity and Earnings Per Common Share

Net income per common share is determined as follows:

	Three Months Ended September 30				Nine Months Ended September 30
	2012		2011		2012		2011
	(in millions of dollars, except share data)
Numerator
Net Income	$	230.2	$	202.0	$	660.5	$	653.2
Denominator (000s)
Weighted Average Common Shares - Basic	278,354.4		298,185.8		284,012.8		305,694.5
Dilution for Assumed Exercises of Stock Options and Nonvested Stock Awards	156.6		987.1		478.4		1,223.9
Weighted Average Common Shares - Assuming Dilution	278,511.0		299,172.9		284,491.2		306,918.4
Net Income Per Common Share
Basic	$	0.83	$	0.68	$	2.33	$	2.14
Assuming Dilution	$	0.83	$	0.68	$	2.32	$	2.13

We use the treasury stock method to account for the effect of outstanding stock options, nonvested stock awards, and performance restricted stock units on the computation of dilutive earnings per share. Under this method, these potential common shares will each have a dilutive effect, as individually measured, when the average market price of Unum Group common stock during the period exceeds the exercise price of the stock options, the grant price of the nonvested stock awards, and/or the threshold stock price of performance restricted stock units.

The outstanding stock options have exercise prices ranging from $11.37 to $26.29, the nonvested stock awards have grant prices ranging from $19.38 to $26.31, and the performance restricted stock units had a threshold stock price of $26.00.

In computing earnings per share assuming dilution, only potential common shares that are dilutive (those that reduce earnings per share) are included. Potential common shares not included in the computation of dilutive earnings per share because their impact would be antidilutive, based on current market prices, approximated 2.8 million and 2.4 million shares of common stock for the three and nine month periods ended September 30, 2012, and 2.4 million and 2.1 million shares of common stock for the three and nine month periods ended September 30, 2011.

In May 2010, our board of directors authorized the repurchase of up to $500.0 million of Unum Group’s common stock. The share repurchase program had an expiration date of May 2011. In February 2011, our board of directors authorized the repurchase of up to $1.0 billion of Unum Group's common stock, in addition to the amount remaining to be repurchased under the $500.0 million authorization. The $1.0 billion share repurchase program had an expiration date of August 2012. In July 2012, our board of directors authorized the repurchase of up to $750.0 million of Unum Group's common stock. The $750.0 million share repurchase program has an expiration date of January 2014 and replaced the previous authorization of $1.0 billion that was scheduled toexpire in August 2012.

In February 2011, we repurchased 7.1 million shares, at a cost of $200.0 million, using an accelerated repurchase agreement with a financial counterparty. As part of this transaction, we simultaneously entered into a forward contract indexed to the price of Unum Group common stock, which subjected the transaction to a future price adjustment. Under the terms of the repurchase agreement, we were 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 was to be settled in shares of Unum Group common stock. Any price adjustment we would have been required to pay would have been settled in either cash or common stock at our option. The final price adjustment settlement occurred in March 2011, resulting in the delivery to us of 0.6 million additional shares. In total, we repurchased and retired 7.7 million shares pursuant to the accelerated repurchase agreement, which completed the $500.0 million repurchase authorization and initiated the $1.0 billion repurchase program.

Note 8 - Stockholders' Equity and Earnings Per Common Share - Continued

In addition to these repurchases, for the year ended December 31, 2011, we repurchased an additional 17.7 million shares on the open market at a cost of $419.9 million, including commissions of $0.3 million. For the three and nine month periods ended September 30, 2012, we repurchased an additional 5.1 million and 18.6 million shares on the open market at a cost of $100.2 million and $400.5 million, respectively, including commissions of $0.1 million and $0.4 million, respectively. The dollar value of shares remaining under the $750.0 million repurchase program at September 30, 2012 was approximately $650.0 million.

All repurchased shares, except for the 7.7 million shares which were retired in 2011, have been classified as treasury stock and accounted for using the cost method.

Unum Group has 25,000,000 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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Document and Entity Information	9 Months Ended
	Sep. 30, 2012	Oct. 26, 2012
Entity Registrant Name	Unum Group
Trading Symbol	UNM
Entity Central Index Key	0000005513
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Document Type	10-Q
Document Period End Date	Sep. 30, 2012
Document Fiscal Year Focus	2012
Document Fiscal Period Focus	Q3
Amendment Flag	false
Entity Common Stock, Shares Outstanding		275,122,712

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Commitments and Contingent Liabilities

9 Months Ended

Sep. 30, 2012

Notes to Financial Statements [Abstract]

Commitments and Contingent Liabilities

Commitments and Contingent Liabilities

Contingent Liabilities

We are a defendant in a number of litigation 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.

Claims 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.

Miscellaneous Matters

In September 2008, we received service of a complaint, in an adversary proceeding in connection with the bankruptcy case In re Quebecor World (USA) Inc., et al. entitled Official Committee of Unsecured Creditors of Quebecor World (USA) Inc., et al., v. American United Life Insurance Company, et al., filed in the United States Bankruptcy Court for the Southern District of New York.  The complaint alleges that we received preference payments relating to notes held by certain of our insurance subsidiaries and seeks to avoid and recover such payments plus interest and cost of the action.  On July 27, 2011, the Bankruptcy Court ruled in our favor, granting a summary judgment motion to dismiss the case against us and the other defendants. On September 28, 2012, the United States District Court for the Southern District of New York affirmed the Bankruptcy Court's decision to dismiss the case. On October 23, 2012, the plaintiff filed a notice of appeal.

In October 2010, Denise Merrimon, Bobby S. Mowery, and all others similarly situated vs. Unum Life Insurance Company of America, was filed in the United States District Court for the District of Maine. This is a putative class action alleging that we breached fiduciary duties owed to certain beneficiaries under certain group life insurance policies when we paid life insurance proceeds by establishing interest-bearing retained asset accounts rather than by mailing checks. Plaintiffs seek to represent a class of beneficiaries under group life insurance contracts that were part of ERISA employee welfare benefit plans and under which we paid death benefits via retained asset accounts. The plaintiffs' principal theories in the case are: (1) funds held in retained asset accounts were plan assets, and the proceeds earned by us from investing those funds belonged to the beneficiaries, and (2) payment of claims using retained asset accounts did not constitute payment under Maine's late payment statute, requiring us to pay interest on the undrawn retained asset account funds at an annual rate of 18 percent. On February 3, 2012, the District Court issued an opinion rejecting both of plaintiffs' principal theories and ordering judgment for us. At the same time, however, the District Court held that we breached a fiduciary duty to the beneficiaries by failing to pay rates comparable to the best rates available in the market for demand deposits. The District Court also certified a class of people who, during a certain period of time, were beneficiaries under certain group life insurance contracts that were part of ERISA employee welfare benefit plans and were paid death benefits using retained asset accounts.  The District Court authorized the parties to make an immediate appeal of its decision to the First Circuit Court of Appeals, and each of the parties sought leave for an early appeal on the issues raised by the District Court's rulings, but the First Circuit decided not to hear the appeal at this time. Therefore, the parties are required to wait until the proceedings in the District Court have concluded for further resolution of those issues. The First Circuit did not rule on or discuss the merits of the case. The case is proceeding in the District Court with discovery on the issue of damages and notice to class members.

In March 2011, we received a request for information from an independent third party as part of an examination on behalf of 26 states and the District of Columbia to evaluate our compliance with the unclaimed property laws of the participating states. Industry-wide practices are currently under review concerning the identification and handling of unclaimed property by insurers, and numerous other insurers are under similar examination. We are cooperating fully with this examination.

In July 2011, the New York State Department of Financial Services issued a special request to approximately 160 insurers, including Unum Group's New York licensed insurance subsidiaries, which requires the insurers to cross-check their life insurance policies, annuity contracts, and retained asset accounts with the latest version of the Social Security Master Death Index to identify any matches. Insurers are also requested to investigate the matches to determine if death benefits are due, to locate the beneficiaries, and to make payments where appropriate. We accrued an estimated loss contingency in the fourth quarter of 2011, the amount of which was immaterial to our consolidated financial position and results of operations. We completed our review during the first quarter of 2012. The estimated loss contingency which we established in the fourth quarter of 2011 was sufficient.

It is possible other state jurisdictions may pursue similar investigations or inquiries or issue directives similar to the New York State Department of Financial Services' letter. It is possible that the audits and related activity may result in additional payments to beneficiaries, the payment of abandoned funds under state law, and/or administrative penalties. We are currently unable to estimate the reasonably possible amount of any additional payments.

Summary

Various lawsuits against us, in addition to those discussed above, have arisen in the normal course of business. 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. It is possible that our results of operations or cash flows in a particular period could be materially affected by an ultimate unfavorable outcome of pending litigation or regulatory matters depending, in part, on our results of operations or cash flows for the particular period. We believe, however, that the ultimate outcome of all pending litigation and regulatory matters, after consideration of applicable reserves and rights to indemnification, should not have a material adverse effect on our financial position.

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CONSOLIDATED STATEMENTS OF INCOME (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Revenue
Premium Income	$ 1,929.4	$ 1,881.2	$ 5,778.9	$ 5,625.7
Net Investment Income	619.2	629.2	1,872.2	1,885.0
Realized Investment Gain (Loss)
Other-Than-Temporary Impairment Loss on Fixed Maturity Securities	0	(1.2)	0	(4.2)
Other Net Realized Investment Gain (Loss)	21.3	(22.7)	31.6	(8.1)
Net Realized Investment Gain (Loss)	21.3	(23.9)	31.6	(12.3)
Other Income	58.1	59.1	174.5	174.8
Total Revenue	2,628.0	2,545.6	7,857.2	7,673.2
Benefits and Expenses
Benefits and Change in Reserves for Future Benefits	1,686.9	1,635.6	5,033.0	4,828.0
Commissions	227.7	220.5	690.8	662.7
Interest and Debt Expense	36.6	35.1	107.3	108.1
Deferral of Acquisition Costs	(111.0)	(110.1)	(347.6)	(334.7)
Amortization of Deferred Acquisition Costs	87.0	84.3	285.6	273.9
Compensation Expense	187.0	198.3	589.3	598.9
Other Expenses	193.4	193.2	572.0	585.7
Total Benefits and Expenses	2,307.6	2,256.9	6,930.4	6,722.6
Income Before Income Tax	320.4	288.7	926.8	950.6
Income Tax
Current	85.5	54.4	126.4	210.7
Deferred	4.7	32.3	139.9	86.7
Total Income Tax	90.2	86.7	266.3	297.4
Net Income	$ 230.2	$ 202.0	$ 660.5	$ 653.2
Net Income Per Common Share
Basic	$ 0.83	$ 0.68	$ 2.33	$ 2.14
Assuming Dilution	$ 0.83	$ 0.68	$ 2.32	$ 2.13

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Fair Values of Financial Instruments

9 Months Ended

Sep. 30, 2012

Notes to Financial Statements [Abstract]

Fair Values of Financial Instruments

Fair Values of Financial Instruments

Presented as follows are the carrying amounts and fair values of financial instruments. The carrying values of financial instruments such as short-term investments, cash and bank deposits, accounts and premiums receivable, accrued investment income, 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 following chart. Certain prior year amounts have been reclassified to conform to current presentation.

	September 30, 2012				December 31, 2011
	Carrying Amount		Fair Value		Carrying Amount		Fair Value
	(in millions of dollars)
Assets
Fixed Maturity Securities	$	44,744.7	$	44,744.7	$	42,486.7	$	42,486.7
Mortgage Loans	1,665.2		1,868.4		1,612.3		1,789.8
Policy Loans	3,117.0		3,199.6		3,051.4		3,124.4
Other Long-term Investments
Derivatives	108.2		108.2		137.7		137.7
Equity Securities	13.0		13.0		11.2		11.2
Miscellaneous Long-term Investments	460.3		460.3		436.4		436.4
Liabilities
Policyholders' Funds
Deferred Annuity Products	$	642.2	$	642.2	$	641.1	$	641.1
Supplementary Contracts without Life Contingencies	536.6		536.6		502.6		502.6
Long-term Debt	2,781.5		2,928.6		2,570.2		2,540.2
Other Liabilities
Derivatives	182.5		182.5		173.7		173.7
Embedded Derivative in Modified Coinsurance Arrangement	107.0		107.0		135.7		135.7
Unfunded Commitments to Investment Partnerships	112.2		112.2		160.6		160.6

The methods and assumptions used to estimate fair values of financial instruments are discussed as follows.

Fair Value Measurements for Financial Instruments Not Carried at Fair Value

Mortgage Loans: Fair values are estimated using discounted cash flow analyses and interest rates currently being offered for similar loans to borrowers with similar credit ratings and maturities. Loans with similar characteristics are aggregated for purposes of the calculations. These financial instruments are assigned a Level 2 within the fair value hierarchy.

Note 3 - Fair Values of Financial Instruments - Continued

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 $2,897.5 million and $2,838.3 million as of September 30, 2012 and December 31, 2011, 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. These financial instruments are assigned a Level 3 within the fair value hierarchy.

Miscellaneous Long-term Investments: Carrying amounts for tax credit partnerships equal the unamortized balance of our contractual commitments and approximate fair value. Fair values for private equity partnerships are primarily derived from valuations provided by the general partner in the partnerships' financial statements. These financial instruments are assigned a Level 3 within the fair value hierarchy.

Policyholders' Funds: Policyholders' funds are comprised primarily of deferred annuity products and supplementary contracts without life contingencies and represent customer deposits plus interest credited at contract rates. Carrying amounts approximate fair value. These financial instruments are assigned a Level 3 within the fair value hierarchy.

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.

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. Debt instruments which are valued using active trades from independent pricing services for which there was current market activity in that specific debt instrument have a fair value of $472.7 million at September 30, 2012 and are assigned a Level 1 within the fair value hierarchy. Debt instruments which are valued based on prices from pricing services that generally use observable inputs for securities or comparable securities in active markets in their valuation techniques have a fair value of $2,455.9 million at September 30, 2012 and are assigned a Level 2.

Unfunded Commitments to Investment Partnerships: Unfunded equity commitments represent legally binding amounts that we have committed to certain investment partnerships subject to the partnerships meeting specified conditions. When these conditions are met, we are obligated to invest these amounts in the partnerships. Carrying amounts approximate fair value. These financial instruments are assigned a Level 2 within the fair value hierarchy.

Fair Value Measurements for Financial Instruments Carried at Fair Value

We report fixed maturity securities, derivative financial instruments, and equity securities at fair value in our consolidated balance sheets. 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.

Note 3 - Fair Values of Financial Instruments - Continued

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 valuation technique 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 the quote is a binding offer. 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 2012, we have applied valuation techniques on a consistent basis to similar assets and liabilities and consistent with those techniques used at year end 2011.

We use observable and unobservable inputs in measuring the fair value of our financial instruments. Inputs that may be used include the following:

• Broker market maker prices and price levels

• Trade Reporting and Compliance Engine (TRACE) pricing

• Prices obtained from external pricing services

• Benchmark yields (Treasury and interest rate swap curves)

• Transactional data for new issuance and secondary trades

• Security cash flows and structures

• Recent issuance/supply

• Sector and issuer level spreads

• Security credit ratings/maturity/capital structure/optionality

• Corporate actions

• Underlying collateral

• Prepayment speeds/loan performance/delinquencies/weighted average life/seasoning

• Public covenants

• Comparative bond analysis

• Derivative spreads

• Relevant reports issued by analysts and rating agencies 

• Audited financial statements

Note 3 - Fair Values of Financial Instruments - Continued

We actively manage our investment portfolio, establish pricing policy, and review the reasonableness of sources and inputs used in developing pricing. We review all prices obtained to ensure they are consistent with a variety of observable market inputs and to verify the validity of a security's price.  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 price changes from the prior month which fall outside a predetermined corridor. 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 closest to the transaction date.

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.

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. We analyze credit default swap spreads relative to the average credit spread embedded within the London Interbank Offered Rate (LIBOR) setting syndicate in determining the effect of credit risk on our derivatives' fair values.  If net counterparty credit risk for a derivative asset is determined to be material and is not adequately reflected in the LIBOR-based fair value obtained from our pricing sources, we adjust the valuations obtained from our pricing sources. For purposes of valuing net counterparty risk, we measure the fair value of a group of financial assets and financial liabilities on the basis of the price that would be received to sell a net long position or transfer a net short position for a particular risk exposure in an orderly transaction between market participants at the measurement date under current market conditions. In regard to our own credit risk component, we adjust the valuation of derivative liabilities wherein the counterparty is exposed to our credit risk when the LIBOR-based valuation of our derivatives obtained from pricing sources does not effectively include an adequate credit component for our own credit risk.

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.

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 combining matrix pricing with vendor purchased software programs, 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.

At September 30, 2012, approximately 15.3 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 highest category of the three-level fair value hierarchy classification wherein inputs are unadjusted and represent quoted prices in active markets for identical assets or liabilities.

Note 3 - Fair Values of Financial Instruments - Continued

The remaining 84.7 percent of our fixed maturity securities were valued based on non-binding quotes or other observable and unobservable inputs, as discussed below.

• Approximately 68.7 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.  Level 2 assets or liabilities are those 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.

• Approximately 3.3 percent of our fixed maturity securities were valued based on one or more non-binding broker price levels, if validated by observable market data, or on TRACE prices for identical or similar assets absent current market activity. 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.

• Approximately 12.7 percent of our fixed maturity securities were valued based on prices of comparable securities, matrix pricing, market models, and/or internal models or were valued based on 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.  Level 3 is 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.

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

Note 3 - Fair Values of Financial Instruments - Continued

Fair value measurements by input level for financial instruments carried at fair value are as follows:

	September 30, 2012
	(in millions of dollars)
	Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
Assets
Fixed Maturity Securities
United States Government and Government Agencies and Authorities	$	539.5	$	836.9	$	—	$	1,376.4
States, Municipalities, and Political Subdivisions	44.0		1,578.5		110.1		1,732.6
Foreign Governments	20.6		1,368.3		46.1		1,435.0
Public Utilities	793.8		9,760.9		499.1		11,053.8
Mortgage/Asset-Backed Securities	—		2,415.2		8.4		2,423.6
All Other Corporate Bonds	5,425.6		20,364.2		894.6		26,684.4
Redeemable Preferred Stocks	24.3		14.6		—		38.9
Total Fixed Maturity Securities	6,847.8		36,338.6		1,558.3		44,744.7
Other Long-term Investments
Derivatives
Interest Rate Swaps and Forwards	—		101.3		—		101.3
Foreign Exchange Contracts	—		6.9		—		6.9
Total Derivatives	—		108.2		—		108.2
Equity Securities	—		8.6		4.4		13.0
Liabilities
Other Liabilities
Derivatives
Interest Rate Swaps	$	—	$	33.3	$	—	$	33.3
Foreign Exchange Contracts	—		149.2		—		149.2
Embedded Derivative in Modified Coinsurance Arrangement	—		—		107.0		107.0
Total Derivatives	—		182.5		107.0		289.5

Note 3 - Fair Values of Financial Instruments - Continued

	December 31, 2011
	(in millions of dollars)
	Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
Assets
Fixed Maturity Securities
United States Government and Government Agencies and Authorities	$	326.6	$	977.8	$	—	$	1,304.4
States, Municipalities, and Political Subdivisions	107.3		1,416.2		68.1		1,591.6
Foreign Governments	—		1,376.7		—		1,376.7
Public Utilities	718.0		9,576.4		338.9		10,633.3
Mortgage/Asset-Backed Securities	—		2,941.5		31.7		2,973.2
All Other Corporate Bonds	3,469.5		20,415.1		665.5		24,550.1
Redeemable Preferred Stocks	—		20.2		37.2		57.4
Total Fixed Maturity Securities	4,621.4		36,723.9		1,141.4		42,486.7
Other Long-term Investments
Derivatives
Interest Rate Swaps	—		134.2		—		134.2
Foreign Exchange Contracts	—		3.5		—		3.5
Total Derivatives	—		137.7		—		137.7
Equity Securities	—		—		11.2		11.2
Liabilities
Other Liabilities
Derivatives
Interest Rate Swaps	$	—	$	32.9	$	—	$	32.9
Foreign Exchange Contracts	—		140.8		—		140.8
Embedded Derivative in Modified Coinsurance Arrangement	—		—		135.7		135.7
Total Derivatives	—		173.7		135.7		309.4

Note 3 - Fair Values of Financial Instruments - Continued

Transfers of assets between Level 1 and Level 2 are as follows:

	Three Months Ended				Nine Months Ended
	September 30, 2012				September 30, 2012
	(in millions of dollars) Transfers into
	Level 1 from Level 2		Level 2 from Level 1		Level 1 from Level 2		Level 2 from Level 1
Fixed Maturity Securities
United States Government and Government Agencies and Authorities	$	426.8	$	60.5	$	205.9	$	20.5
States, Municipalities, and Political Subdivisions	43.0		62.9		41.9		74.8
Foreign Governments	21.7		—		20.7		—
Public Utilities	382.4		743.6		479.0		483.6
All Other Corporate Bonds	2,152.9		1,667.4		2,823.3		1,706.0
Total Fixed Maturity Securities	$	3,026.8	$	2,534.4	$	3,570.8	$	2,284.9
Equity Securities	$	—	$	7.4	$	—	$	—

	Three Months Ended				Nine Months Ended
	September 30, 2011				September 30, 2011
	(in millions of dollars) Transfers into
	Level 1 from Level 2		Level 2 from Level 1		Level 1 from Level 2		Level 2 from Level 1
Fixed Maturity Securities
United States Government and Government Agencies and Authorities	$	177.2	$	16.1	$	169.8	$	—
States, Municipalities, and Political Subdivisions	—		20.0		25.4		301.9
Foreign Governments	—		—		—		0.7
Public Utilities	665.7		694.8		710.5		488.6
All Other Corporate Bonds	1,798.1		2,347.2		2,334.1		1,732.3
Total Fixed Maturity Securities	$	2,641.0	$	3,078.1	$	3,239.8	$	2,523.5

Transfers between Level 1 and Level 2 occurred due to the change in availability of either a TRACE or broker market maker price. Depending on current market conditions, the availability of these Level 1 prices can vary from period to period. For fair value measurements of financial instruments that were transferred either into or out of Level 1 or 2, we reflect the transfers using the fair value at the beginning of the period.

Note 3 - Fair Values 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, 2012
	(in millions of dollars)
				Total Realized and Unrealized Investment Gains Included in
	Beginning of Period			Earnings			Other Comprehensive Income or Loss			Purchases		Sales			Level 3 Transfers					End of Period
															Into		Out of
Fixed Maturity Securities
States, Municipalities, and Political Subdivisions	$	—		$	—		$	2.0		$	—	$	—		$	108.1	$	—		$	110.1
Foreign Governments	—			—			1.3			—		—			44.8		—			46.1
Public Utilities	162.8			—			8.4			—		(1.7		)	340.5		(10.9		)	499.1
Mortgage/Asset-Backed Securities	0.6			—			0.4			—		—			7.4		—			8.4
All Other Corporate Bonds	639.6			—			19.8			—		(5.3		)	386.7		(146.2		)	894.6
Redeemable Preferred Stocks	22.2			—			—			—		—			—		(22.2		)	—
Total Fixed Maturity Securities	825.2			—			31.9			—		(7.0		)	887.5		(179.3		)	1,558.3
Equity Securities	4.4			—			—			—		—			—		—			4.4
Embedded Derivative in Modified Coinsurance Arrangement	(126.7		)	19.7			—			—		—			—		—			(107.0		)
	Three Months Ended September 30, 2011
	(in millions of dollars)
				Total Realized and Unrealized Investment Gains (Losses) Included in
	Beginning of Period			Earnings			Other Comprehensive Income or Loss			Purchases		Sales			Level 3 Transfers					End of Period
															Into		Out of
Fixed Maturity Securities
Public Utilities	$	217.9		$	0.1		$	9.3		$	30.0	$	(11.9	)	$	220.2	$	(69.8	)	$	395.8
Mortgage/Asset-Backed Securities	19.7			—			(0.1		)	—		—			—		—			19.6
All Other Corporate Bonds	528.3			—			1.3			—		(17.6		)	119.6		(164.8		)	466.8
Redeemable Preferred Stocks	22.6			—			(0.9		)	—		—			—		—			21.7
Total Fixed Maturity Securities	788.5			0.1			9.6			30.0		(29.5		)	339.8		(234.6		)	903.9
Equity Securities	3.6			(0.4		)	(2.4		)	—		—			9.6		—			10.4
Embedded Derivative in Modified Coinsurance Arrangement	(87.0		)	(33.7		)	—			—		—			—		—			(120.7		)

Note 3 - Fair Values of Financial Instruments - Continued

	Nine Months Ended September 30, 2012
	(in millions of dollars)
				Total Realized and Unrealized Investment Gains (Losses) Included in
	Beginning of Year			Earnings			Other Comprehensive Income or Loss			Purchases		Sales			Level 3 Transfers					End of Period
															Into		Out of
Fixed Maturity Securities
States, Municipalities, and Political Subdivisions	$	68.1		$	—		$	(0.9	)	$	—	$	(0.3	)	$	43.2	$	—		$	110.1
Foreign Governments	—			—			5.2			—		—			40.9		—			46.1
Public Utilities	338.9			—			5.4			3.6		(3.7		)	361.7		(206.8		)	499.1
Mortgage/Asset-Backed Securities	31.7			—			0.9			7.0		(0.1		)	—		(31.1		)	8.4
All Other Corporate Bonds	665.5			—			34.0			30.2		(49.0		)	448.0		(234.1		)	894.6
Redeemable Preferred Stocks	37.2			(1.0		)	0.8			—		(14.3		)	—		(22.7		)	—
Total Fixed Maturity Securities	1,141.4			(1.0		)	45.4			40.8		(67.4		)	893.8		(494.7		)	1,558.3
Equity Securities	11.2			—			—			—		(0.1		)	—		(6.7		)	4.4
Embedded Derivative in Modified Coinsurance Arrangement	(135.7		)	28.7			—			—		—			—		—			(107.0		)
	Nine Months Ended September 30, 2011
	(in millions of dollars)
				Total Realized and Unrealized Investment Gains (Losses) Included in
	Beginning of Year			Earnings			Other Comprehensive Income or Loss			Purchases		Sales			Level 3 Transfers					End of Period
															Into		Out of
Fixed Maturity Securities
Public Utilities	$	173.6		$	0.1		$	17.1		$	30.0	$	(15.7	)	$	299.7	$	(109.0	)	$	395.8
Mortgage/Asset-Backed Securities	0.7			—			(0.4		)	19.4		(0.1		)	—		—			19.6
All Other Corporate Bonds	829.7			(2.1		)	4.7			41.7		(32.5		)	96.2		(470.9		)	466.8
Redeemable Preferred Stocks	21.7			—			—			—		—			—		—			21.7
Total Fixed Maturity Securities	1,025.7			(2.0		)	21.4			91.1		(48.3		)	395.9		(579.9		)	903.9
Equity Securities	1.5			(0.4		)	(1.7		)	2.0		—			9.0		—			10.4
Embedded Derivative in Modified Coinsurance Arrangement	(96.3		)	(24.4		)	—			—		—			—		—			(120.7		)

Note 3 - Fair Values of Financial Instruments - Continued

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. Gains (losses) which are included in earnings and are attributable to the change in unrealized gains or losses relating to assets or liabilities valued using significant unobservable inputs and still held at period end were $19.7 million and $28.7 million, respectively, for the three and nine months ended September 30, 2012 and $(33.7) million and $(24.4) million, respectively, for the three and nine months ended September 30, 2011. These amounts relate entirely to the changes in fair value of an embedded derivative in a modified coinsurance arrangement which are reported as realized investment gains and losses.

Quantitative information regarding the significant unobservable inputs used in Level 3 fair value measurements, all of which are internally derived, is as follows:

	September 30, 2012
	(in millions of dollars)
	Fair Value			Unobservable Input		Range/Weighted Average
Fixed Maturity Securities
Public Utilities	$	17.4		- Comparability Adjustment	(b)	0.20% - 0.20%/0.20%
Mortgage/Asset-Backed Securities - Private	0.5			- Discount for Size	(c)	5.77% - 5.86%/5.84%
All Other Corporate Bonds - Private	485.1			- Change in Benchmark Reference - Comparability Adjustment - Discount for Size - Lack of Marketability - Volatility of Credit - Market Convention	(a) (b) (c) (d) (e) (f)	(0.05)% - 2.60%/0.15% (0.50)% - (0.50)%/(0.50)% 0.50% - 0.50%/0.50% 0.01% - 1.00%/0.22% (0.50)% - 6.92%/1.37% Priced at Par
All Other Corporate Bonds - Public	115.9			- Comparability Adjustment - Discount for Size - Lack of Marketability - Volatility of Credit - Market Convention	(b) (c) (d) (e) (f)	(1.24)% - 0.50%/(0.16)% 0.00% - 0.10%/0.04% 0.01% - 0.40%/0.19% 0.01% - 0.01%/0.01% Priced at Par
Equity Securities - Private	4.1			- Market Convention	(f)	Priced at Cost or Owner's Equity
Embedded Derivative in Modified Coinsurance Arrangement	(107.0		)	- Projected Liability Cash Flows	(g)	Actuarial Assumptions

(a) Represents basis point adjustments for changes in benchmark spreads associated with various ratings categories

(b) Represents basis point adjustments for changes in benchmark spreads associated with various industry sectors

(c) Represents basis point adjustments based on issue/issuer size relative to the benchmark

(d) Represents basis point adjustments to apply a discount due to the illiquidity of an investment

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

(f) Represents a decision to price based on par value, cost, or owner's equity when limited data is available

(g) Represents various actuarial assumptions required to derive the liability cash flows including incidence, termination, and lapse rates

Isolated increases in unobservable inputs other than market convention will result in a lower fair value measurement, whereas isolated decreases will result in a higher fair value measurement. 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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Accounting Developments

9 Months Ended

Sep. 30, 2012

Accounting Developments [Abstract]

Accounting Developments

Accounting Developments

Accounting Updates Adopted in 2012:

Accounting Standards Codification (ASC) 220 "Comprehensive Income"

In June 2011, the Financial Accounting Standards Board (FASB) issued an update related to the financial statement presentation of comprehensive income. This update requires that non-owner changes in stockholders' equity be presented either in a single continuous statement of comprehensive income or in two separate but consecutive statements. In the two-statement approach, the first statement should present net income and its components, followed consecutively by a second statement presenting total other comprehensive income, the components of other comprehensive income, and the total of comprehensive income. In December 2011, the FASB issued an update to indefinitely defer the effective date pertaining to the presentation of reclassification adjustments and reinstated the previous requirement to present reclassification adjustments either on the face of the statement or in financial statement footnotes. We adopted these updates effective January 1, 2012. The adoption of these updates modified our financial statement presentation but had no effect on our financial position or results of operations.

ASC 350 "Intangibles - Goodwill and Other"

In September 2011, the FASB issued an update which gives companies the option to first assess qualitative factors to determine whether it is necessary to perform the two-step quantitative goodwill impairment test. An entity is not required to calculate the fair value of a reporting unit unless the entity determines, based on a qualitative assessment, that it is more likely than not that its fair value is less than its carrying amount. We adopted this update effective January 1, 2012. The adoption of this update had no effect on our financial position or results of operations.

ASC 820 "Fair Value Measurements and Disclosures"

In May 2011, the FASB issued an update to require additional disclosures regarding fair value measurements and to provide clarifying guidance on the application of existing fair value measurement requirements. Specifically, the update requires additional information on Level 1 and Level 2 transfers within the fair value hierarchy; the categorization by level of the fair value hierarchy for items that are not measured at fair value in the statement of financial position, but for which the fair value of such items is required to be disclosed; and information about the sensitivity of a fair value measurement in Level 3 of the fair value hierarchy to changes in unobservable inputs and any interrelationships between those unobservable inputs. We adopted this update effective January 1, 2012. The adoption of this update expanded our disclosures but had no effect on our financial position or results of operations.

ASC 860 "Transfers and Servicing"

In April 2011, the FASB issued an update to revise the criteria for assessing effective control for repurchase agreements and other agreements that both entitle and obligate a transferor to repurchase or redeem financial assets before their maturity. The determination of whether the transfer of a financial asset subject to a repurchase agreement is a sale is based, in part, on whether the entity maintains effective control over the financial asset. This update removes from the assessment of effective control the criterion requiring the transferor to have the ability to repurchase or redeem the financial asset on substantially the agreed terms, even in the event of default by the transferee, and the related requirement to demonstrate that the transferor possess adequate collateral to fund substantially all the cost of purchasing replacement financial assets. We adopted this update effective January 1, 2012. The adoption of this update had no effect on our financial position or results of operations.

ASC 944 "Financial Services - Insurance"

In October 2010, the FASB issued an update to address the diversity in practice regarding the interpretation of which costs relating to the acquisition of new or renewal insurance contracts qualify as deferred acquisition costs.  The amendments in the update require that only incremental direct costs associated with the successful acquisition of a new or renewal insurance contract can be capitalized. All other costs are to be expensed as incurred. We adopted this update effective January 1, 2012 and applied the amendments retrospectively, adjusting all prior periods. The cumulative effect of the adoption as of January 1, 2011, was a decrease to stockholders' equity of $459.5 million. The following table summarizes the effects on our financial statements.

	Historical						Effect			Historical						Effect
	Accounting			As			of			Accounting			As			of
	Method			Adjusted			Change			Method			Adjusted			Change
	(in millions of dollars, except share data)
	Three Months Ended September 30, 2011									Nine Months Ended September 30, 2011
Consolidated Statements of Income
Deferral of Acquisition Costs	$	(155.6	)	$	(110.1	)	$	45.5		$	(472.1	)	$	(334.7	)	$	137.4
Amortization of Deferred Acquisition Costs	125.2			84.3			(40.9		)	400.4			273.9			(126.5		)
Income Tax - Deferred	33.3			32.3			(1.0		)	90.0			86.7			(3.3		)
Net Income	205.6			202.0			(3.6		)	660.8			653.2			(7.6		)
Net Income Per Common Share
Basic	0.69			0.68			(0.01		)	2.16			2.14			(0.02		)
Assuming Dilution	0.69			0.68			(0.01		)	2.15			2.13			(0.02		)
Consolidated Statements of Comprehensive Income
Net Income	$	205.6		$	202.0		$	(3.6	)	$	660.8		$	653.2		$	(7.6	)
Change in Adjustment to Reserves for Future Policy and Contract Benefits, Net of Reinsurance and Other	(705.3		)	(703.3		)	2.0			(934.0		)	(931.2		)	2.8
Change in Foreign Currency Translation Adjustment	(34.1		)	(33.8		)	0.3			(6.0		)	(6.0		)	—
Consolidated Statement of Cash Flows
Net Income										$	660.8		$	653.2		$	(7.6	)
Change in Deferred Acquisition Costs										(71.7		)	(60.8		)	10.9
Change in Income Taxes										41.2			37.9			(3.3		)
	December 31, 2011									September 30, 2011
Consolidated Balance Sheets
Deferred Acquisition Costs	$	2,300.9		$	1,677.1		$	(623.8	)	$	2,572.4		$	1,860.6		$	(711.8	)
Deferred Income Tax	261.2			44.7			(216.5		)	795.3			547.8			(247.5		)
Net Unrealized Gain on Securities Not Other-Than-Temporarily Impaired	605.8			614.8			9.0			885.6			894.0			8.4
Foreign Currency Translation Adjustment	(121.5		)	(117.6		)	3.9			(116.9		)	(113.0		)	3.9
Retained Earnings	7,031.2			6,611.0			(420.2		)	7,487.3			7,010.7			(476.6		)

Accounting Updates Adopted in 2011:

ASC 310 “Receivables”

In January and April 2011, the FASB deferred the effective date of disclosures about troubled debt restructurings and issued updates providing additional clarification to help creditors in determining whether a creditor has granted a concession as well as whether a debtor is experiencing financial difficulties for purposes of determining whether a restructuring constitutes a troubled debt restructuring. We adopted these updates effective July 1, 2011. The adoption of these updates expanded our disclosures but had no effect on our financial position or results of operations.

Accounting Updates Outstanding:

ASC 210 "Balance Sheet - Disclosures about Offsetting Assets and Liabilities"

In December 2011, the FASB issued an update to require additional disclosures and information about financial instruments and derivative instruments that are either offset on the balance sheet or are subject to an enforceable master netting arrangement. These disclosures are intended to provide information that will enable users of financial statements to evaluate the effect or potential effect of netting arrangements on an entity's financial position, including the effect or potential effect of rights of setoff associated with certain financial instruments and derivative instruments. The amendments in this update are effective for interim and annual periods beginning on or after January 1, 2013. The adoption of this update will expand our disclosures but will have no effect on our financial position or results of operations.

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Derivative Financial Instruments (Tables)

9 Months Ended

Sep. 30, 2012

Notes to Financial Statements [Abstract]

Notional Amounts for Each Category of Derivative Activity

The table below summarizes, by notional amounts, the activity for each category of derivatives.

	Swaps
	Receive Variable/Pay Fixed		Receive Fixed/Pay Fixed		Receive Fixed/Pay Variable		Forwards		Total
			(in millions of dollars)
Balance at June 30, 2011	$	174.0	$	579.7	$	785.0	$	—	$	1,538.7
Additions	—		—		—		15.0		15.0
Terminations	—		5.0		50.0		—		55.0
Balance at September 30, 2011	$	174.0	$	574.7	$	735.0	$	15.0	$	1,498.7
Balance at December 31, 2010	$	174.0	$	617.9	$	890.0	$	—	$	1,681.9
Additions	—		—		—		46.9		46.9
Terminations	—		43.2		155.0		31.9		230.1
Balance at September 30, 2011	$	174.0	$	574.7	$	735.0	$	15.0	$	1,498.7
Balance at June 30, 2012	$	174.0	$	540.5	$	595.0	$	—	$	1,309.5
Additions	—		—		250.0		25.0		275.0
Terminations	—		26.3		45.0		—		71.3
Balance at September 30, 2012	$	174.0	$	514.2	$	800.0	$	25.0	$	1,513.2
Balance at December 31, 2011	$	174.0	$	554.0	$	685.0	$	—	$	1,413.0
Additions	—		—		250.0		81.0		331.0
Terminations	—		39.8		135.0		56.0		230.8
Balance at September 30, 2012	$	174.0	$	514.2	$	800.0	$	25.0	$	1,513.2

Timing of Anticipated Settlements of Interest Rate Swaps Outstanding

The following table summarizes the timing of anticipated settlements of interest rate swaps outstanding under our cash flow hedging programs at September 30, 2012, whereby we receive a fixed rate and pay a variable rate. The weighted average variable interest rates assume current market conditions.

	2012			2013			Total
	(in millions of dollars)
Notional Value	$	50.0		$	150.0		$	200.0
Weighted Average Receive Rate	6.50		%	6.34		%	6.38		%
Weighted Average Pay Rate	0.36		%	0.36		%	0.36		%

Location and Fair Values of Derivative Financial Instruments

The following tables summarize the location and fair values of derivative financial instruments, as reported in our consolidated balance sheets.

	September 30, 2012
	(in millions of dollars)
	Asset Derivatives			Liability Derivatives
	Balance Sheet Location	Fair Value		Balance Sheet Location	Fair Value
Designated as Hedging Instruments
Interest Rate Swaps and Forwards	Other L-T Investments	$	101.3	Other Liabilities	$	33.3
Foreign Exchange Contracts	Other L-T Investments	6.9		Other Liabilities	149.2
Total		$	108.2		$	182.5
Not Designated as Hedging Instruments
Embedded Derivative in Modified Coinsurance Arrangement				Other Liabilities	$	107.0

	December 31, 2011
	(in millions of dollars)
	Asset Derivatives			Liability Derivatives
	Balance Sheet Location	Fair Value		Balance Sheet Location	Fair Value
Designated as Hedging Instruments
Interest Rate Swaps	Other L-T Investments	$	134.2	Other Liabilities	$	32.9
Foreign Exchange Contracts	Other L-T Investments	3.5		Other Liabilities	140.8
Total		$	137.7		$	173.7
Not Designated as Hedging Instruments
Embedded Derivative in Modified Coinsurance Arrangement				Other Liabilities	$	135.7

Location of and Gains and Losses on Derivative Financial Instruments Designated as Cash Flow Hedging Instruments

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

	Three Months Ended September 30, 2012
	Gain (Loss) Recognized in OCI on Derivatives (Effective Portion)			Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)
	(in millions of dollars)
Interest Rate Swaps	$	20.2		$	11.7		(1)
Interest Rate Swaps	—			0.1			(2)
Interest Rate Swaps	—			(0.5		)	(3)
Foreign Exchange Contracts	—			(0.1		)	(1)
Foreign Exchange Contracts	(14.7		)	(16.7		)	(2)
Total	$	5.5		$	(5.5	)

(1) Gain (loss) recognized in net investment income

(2) Gain (loss) recognized in net realized investment gain (loss)

(3) Loss recognized in interest and debt expense

	Three Months Ended September 30, 2011
	Gain Recognized in OCI on Derivatives (Effective Portion)		Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)
	(in millions of dollars)
Interest Rate Swaps and Forwards	$	8.0	$	8.6		(1)
Interest Rate Swaps	—		0.7			(2)
Interest Rate Swaps	—		(0.4		)	(3)
Foreign Exchange Contracts	—		(0.3		)	(1)
Foreign Exchange Contracts	51.4		46.6			(2)
Total	$	59.4	$	55.2

(1) Gain (loss) recognized in net investment income

(2) Gain recognized in net realized investment gain (loss)

(3) Loss recognized in interest and debt expense

	Nine Months Ended September 30, 2012
	Gain (Loss) Recognized in OCI on Derivatives (Effective Portion)			Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)
	(in millions of dollars)
Interest Rate Swaps and Forwards	$	55.1		$	30.4		(1)
Interest Rate Swaps	—			2.2			(2)
Interest Rate Swaps	—			(1.3		)	(3)
Foreign Exchange Contracts	—			(0.9		)	(1)
Foreign Exchange Contracts	(4.9		)	(18.6		)	(2)
Total	$	50.2		$	11.8

(1) Gain (loss) recognized in net investment income

(2) Gain (loss) recognized in net realized investment gain (loss)

(3) Loss recognized in interest and debt expense

	Nine Months Ended September 30, 2011
	Gain Recognized in OCI on Derivatives (Effective Portion)		Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)
	(in millions of dollars)
Interest Rate Swaps and Forwards	$	35.4	$	26.0		(1)
Interest Rate Swaps	—		2.5			(2)
Interest Rate Swaps	—		(1.2		)	(3)
Foreign Exchange Contracts	—		(0.9		)	(1)
Foreign Exchange Contracts	40.9		22.0			(2)
Total	$	76.3	$	48.4

Location of and Gain (Loss) on Embedded Derivative in a Modified Coinsurance Arrangement

The following table summarizes the location of and gains (losses) on our embedded derivative in a modified coinsurance arrangement, as reported in our consolidated statements of income.

	Three Months Ended September 30					Nine Months Ended September 30
	2012		2011			2012		2011
	(in millions of dollars)
Gain (Loss) Recognized in Net Realized Investment Gain (Loss)	$	19.7	$	(33.7	)	$	28.7	$	(24.4	)

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Other

9 Months Ended

Sep. 30, 2012

Other [Abstract]

Other Items Disclosure

Debt

At September 30, 2012, short-term debt consisted of $458.3 million of securities lending transactions.

In August 2012, we issued $250.0 million of unsecured senior notes in a public offering. These notes, due in 2042, bear interest at a fixed rate of 5.75% and are payable semi-annually. The notes are callable at or above par and rank equally in right of payment with all of our other unsecured and unsubordinated debt.

During the nine months ended September 30, 2012, we made principal payments of $38.1 million and $7.5 million on our senior secured non-recourse floating rate notes issued by Northwind Holdings, LLC and Tailwind Holdings, LLC, respectively.

Income Tax

At September 30, 2012, we had a liability of $32.2 million for unrecognized tax benefits, all of which is associated with deferred tax assets. During the second quarter of 2012, we released a liability for unrecognized tax benefits of $61.1 million along with a corresponding deferred tax asset. We recognized interest expense (benefits) and penalties of less than $0.1 million and $(10.5) million for the three and nine months ended September 30, 2012, respectively, and $1.5 million and $4.1 million for the three and nine months ended September 30, 2011, respectively.

During 2010, the Internal Revenue Service (IRS) completed its examination of tax years 2005 and 2006 and issued its revenue agent's report (RAR) in December 2010. In January 2011, we filed a protest to the RAR with respect to all significant adverse proposed adjustments. Although we have not yet reached a final settlement with the IRS for these years, the appeal may be resolved in whole or in part within 12 months, and statutes of limitations may expire in multiple jurisdictions within the same period.  As a result of the potential settlement and its effect on subsequent years, it is reasonably possible that our liability for unrecognized tax benefits could decrease within 12 months by $17.2 million to $22.0 million, with a commensurate decrease in deferred tax assets.  We believe sufficient provision has been made for all uncertain tax provisions and that any adjustments by tax authorities with respect to such positions would not have a material adverse effect on our financial position, liquidity, or results of operations.

During the third quarter of 2012, an income tax rate reduction was enacted which reduced the tax rate in the U.K. from 25 percent to 24 percent retroactive to April 2012 and from 24 percent to 23 percent effective April 2013. During the third quarter of 2011, an income tax rate reduction was enacted which reduced the tax rate in the U.K. from 27 percent to 26 percent retroactive to April 2011 and from 26 percent to 25 percent effective April 2012.  We are required to adjust deferred tax assets and liabilities through income on the date of enactment of a rate change, and as such, we recorded a reduction of $9.3 million and $6.8 million to our income tax expense during the third quarters of 2012 and 2011, respectively.

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Segment Information

9 Months Ended

Sep. 30, 2012

Segment Reporting [Abstract]

Segment Information

Segment Information

Our reporting segments are comprised of Unum US, Unum UK, Colonial Life, Closed Block, and Corporate. Effective with the fourth quarter of 2011 we modified our reporting segments to reclassify our long-term care products from the Unum US segment to the Closed Block segment.  We also reclassified our other insurance products not actively marketed which were previously reported in the Corporate and Other segment to the Closed Block segment. Prior period segment results have been adjusted to reflect this change in our reporting classifications.

In the following segment financial data, "operating revenue" excludes net realized investment gains or losses. "Operating income" or "operating loss" excludes net realized investment gains or losses, non-operating retirement-related gains or losses, and income tax. These are considered non-GAAP financial measures. These non-GAAP financial measures of "operating revenue" and "operating income" or "operating loss" differ from revenue and income before income tax as presented in our consolidated statements of income prepared in accordance with GAAP due to the exclusion of before-tax realized investment gains or losses and non-operating retirement-related gains or losses. We previously allocated the amortization of prior period actuarial gains or losses, the component of the net periodic benefit costs for our pensions and other postretirement benefit plans which we consider to be non-operating, to our Corporate segment. During the first quarter of 2012, we determined that we would modify our segment reporting. Effective January 1, 2012, the amortization of prior period actuarial gains or losses is no longer included in operating income or operating loss by segment. Prior period segment results for our Corporate segment have been adjusted to conform to current year reporting.

We measure segment performance excluding these items because we believe this performance measure is a better indicator of the profitability and underlying trends in our business. Realized 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 realized investment gains or losses. Although we may experience realized 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. Our non-operating retirement-related gains or losses are primarily driven by market performance and are not indicative of the operational results of our businesses. However, although we manage our non-operating retirement-related gains or losses separately from the operational performance of our business, these gains or losses impact the overall profitability of our company and will increase or decrease over time, depending on market conditions and the resulting impact on the actuarial gains or losses in our pensions and other postretirement benefit plans. The exclusion of these items from segment performance does not replace net income or net loss as a measure of our overall profitability.

A reconciliation of total operating revenue and operating income by segment to revenue and net income as reported in our consolidated statements of income follows:

	Three Months Ended September 30						Nine Months Ended September 30
	2012			2011			2012			2011
	(in millions of dollars)
Operating Revenue by Segment	$	2,606.7		$	2,569.5		$	7,825.6		$	7,685.5
Net Realized Investment Gain (Loss)	21.3			(23.9		)	31.6			(12.3		)
Revenue	$	2,628.0		$	2,545.6		$	7,857.2		$	7,673.2
Operating Income by Segment	$	310.7		$	320.6		$	930.0		$	986.9
Net Realized Investment Gain (Loss)	21.3			(23.9		)	31.6			(12.3		)
Non-operating Retirement-related Loss	(11.6		)	(8.0		)	(34.8		)	(24.0		)
Income Tax	(90.2		)	(86.7		)	(266.3		)	(297.4		)
Net Income	$	230.2		$	202.0		$	660.5		$	653.2

Additionally, effective January 1, 2012, we adopted an accounting standards update regarding the capitalization of costs associated with the acquisition of insurance contracts and applied the amendments retrospectively. Operating income and assets by segment have been adjusted to reflect our retrospective adoption. See Note 2 for further information.

Premium income by major line of business within each of our segments is presented as follows:

	Three Months Ended September 30					Nine Months Ended September 30
	2012		2011			2012		2011
	(in millions of dollars)
Unum US
Group Disability
Group Long-term Disability	$	392.4	$	393.7		$	1,185.7	$	1,185.3
Group Short-term Disability	120.1		115.2			356.0		339.0
Group Life and Accidental Death & Dismemberment
Group Life	297.3		277.6			885.1		825.3
Accidental Death & Dismemberment	29.2		27.7			86.2		81.6
Supplemental and Voluntary
Individual Disability - Recently Issued	119.9		116.6			357.0		348.3
Voluntary Benefits	153.0		143.6			468.9		433.5
	1,111.9		1,074.4			3,338.9		3,213.0
Unum UK
Group Long-term Disability	102.9		107.3			306.5		318.3
Group Life	56.4		52.1			164.6		151.6
Supplemental and Voluntary	15.9		16.1			48.0		48.5
	175.2		175.5			519.1		518.4
Colonial Life
Accident, Sickness, and Disability	181.8		174.3			541.8		519.7
Life	52.2		47.0			156.3		140.0
Cancer and Critical Illness	65.4		62.4			194.5		186.4
	299.4		283.7			892.6		846.1
Closed Block
Individual Disability	183.1		196.4			554.9		595.0
Long-term Care	159.4		152.1			471.5		453.5
All Other	0.4		(0.9		)	1.9		(0.3		)
	342.9		347.6			1,028.3		1,048.2
Total	$	1,929.4	$	1,881.2		$	5,778.9	$	5,625.7

Selected operating statement data by segment is presented as follows:

	Unum US		Unum UK		Colonial Life		Closed Block		Corporate			Total
	(in millions of dollars)
Three Months Ended September 30, 2012
Premium Income	$	1,111.9	$	175.2	$	299.4	$	342.9	$	—		$	1,929.4
Net Investment Income	236.3		34.8		33.9		307.3		6.9			619.2
Other Income	31.3		—		—		26.4		0.4			58.1
Operating Revenue	$	1,379.5	$	210.0	$	333.3	$	676.6	$	7.3		$	2,606.7
Operating Income (Loss)	$	216.3	$	27.5	$	68.7	$	25.6	$	(27.4	)	$	310.7
Three Months Ended September 30, 2011
Premium Income	$	1,074.4	$	175.5	$	283.7	$	347.6	$	—		$	1,881.2
Net Investment Income	240.0		43.3		32.5		300.1		13.3			629.2
Other Income	30.4		—		0.1		26.4		2.2			59.1
Operating Revenue	$	1,344.8	$	218.8	$	316.3	$	674.1	$	15.5		$	2,569.5
Operating Income (Loss)	$	209.2	$	34.7	$	66.7	$	30.8	$	(20.8	)	$	320.6
Nine Months Ended September 30, 2012
Premium Income	$	3,338.9	$	519.1	$	892.6	$	1,028.3	$	—		$	5,778.9
Net Investment Income	711.8		120.5		103.5		913.4		23.0			1,872.2
Other Income	93.1		0.1		0.2		78.9		2.2			174.5
Operating Revenue	$	4,143.8	$	639.7	$	996.3	$	2,020.6	$	25.2		$	7,825.6
Operating Income (Loss)	$	634.9	$	96.3	$	206.0	$	66.7	$	(73.9	)	$	930.0
Nine Months Ended September 30, 2011
Premium Income	$	3,213.0	$	518.4	$	846.1	$	1,048.2	$	—		$	5,625.7
Net Investment Income	712.6		139.3		99.6		888.9		44.6			1,885.0
Other Income	90.9		0.1		0.4		80.6		2.8			174.8
Operating Revenue	$	4,016.5	$	657.8	$	946.1	$	2,017.7	$	47.4		$	7,685.5
Operating Income (Loss)	$	609.5	$	138.8	$	205.1	$	93.1	$	(59.6	)	$	986.9

Assets by segment are as follows:

	September 30		December 31
	2012		2011
	(in millions of dollars)
Unum US	$	19,135.0	$	18,583.6
Unum UK	3,945.4		3,549.5
Colonial Life	3,357.9		3,167.8
Closed Block	32,718.9		31,439.5
Corporate	2,962.4		2,814.8
Total	$	62,119.6	$	59,555.2

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Net Income Per Common Share (Detail) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Earnings Per Share Disclosure [Line Items]
Net Income	$ 230.2	$ 202.0	$ 660.5	$ 653.2
Denominator (000s)
Weighted Average Common Shares - Basic	278,354,400	298,185,800	284,012,800	305,694,500
Dilution for Assumed Exercises of Stock Options and Nonvested Stock Awards	156,600	987,100	478,400	1,223,900
Weighted Average Common Shares - Assuming Dilution	278,511,000	299,172,900	284,491,200	306,918,400
Net Income Per Common Share
Basic	$ 0.83	$ 0.68	$ 2.33	$ 2.14
Assuming Dilution	$ 0.83	$ 0.68	$ 2.32	$ 2.13

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Investments

9 Months Ended

Sep. 30, 2012

Notes to Financial Statements [Abstract]

Investments

Investments

Fixed Maturity Securities

At September 30, 2012 and December 31, 2011, 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, 2012
	(in millions of dollars)
	Amortized Cost		Gross Unrealized Gain		Gross Unrealized Loss		Fair Value
United States Government and Government Agencies and Authorities	$	1,031.5	$	345.8	$	0.9	$	1,376.4
States, Municipalities, and Political Subdivisions	1,423.7		316.0		7.1		1,732.6
Foreign Governments	1,209.6		225.4		—		1,435.0
Public Utilities	9,172.9		1,903.2		22.3		11,053.8
Mortgage/Asset-Backed Securities	2,105.3		318.8		0.5		2,423.6
All Other Corporate Bonds	22,481.3		4,263.3		60.2		26,684.4
Redeemable Preferred Stocks	33.0		5.9		—		38.9
Total Fixed Maturity Securities	$	37,457.3	$	7,378.4	$	91.0	$	44,744.7

	December 31, 2011
	(in millions of dollars)
	Amortized Cost		Gross Unrealized Gain		Gross Unrealized Loss		Fair Value
United States Government and Government Agencies and Authorities	$	1,005.8	$	299.7	$	1.1	$	1,304.4
States, Municipalities, and Political Subdivisions	1,377.8		222.6		8.8		1,591.6
Foreign Governments	1,139.4		237.3		—		1,376.7
Public Utilities	9,015.7		1,646.2		28.6		10,633.3
Mortgage/Asset-Backed Securities	2,634.6		344.1		5.5		2,973.2
All Other Corporate Bonds	21,411.6		3,314.8		176.3		24,550.1
Redeemable Preferred Stocks	55.8		3.5		1.9		57.4
Total Fixed Maturity Securities	$	36,640.7	$	6,068.2	$	222.2	$	42,486.7

As of September 30, 2012 and December 31, 2011, we held no fixed maturity securities for which a portion of an other-than-temporary impairment had previously been recognized in other comprehensive income.

Note 4 - Investments - Continued

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

	September 30, 2012
	(in millions of dollars)
	Less Than 12 Months				12 Months or Greater
	Fair Value		Gross Unrealized Loss		Fair Value		Gross Unrealized Loss
United States Government and Government Agencies and Authorities	$	—	$	—	$	6.6	$	0.9
States, Municipalities, and Political Subdivisions	1.6		—		42.3		7.1
Public Utilities	109.3		7.5		160.2		14.8
Mortgage/Asset-Backed Securities	—		—		8.3		0.5
All Other Corporate Bonds	292.3		11.8		571.4		48.4
Total Fixed Maturity Securities	$	403.2	$	19.3	$	788.8	$	71.7

	December 31, 2011
	(in millions of dollars)
	Less Than 12 Months				12 Months or Greater
	Fair Value		Gross Unrealized Loss		Fair Value		Gross Unrealized Loss
United States Government and Government Agencies and Authorities	$	—	$	—	$	6.3	$	1.1
States, Municipalities, and Political Subdivisions	51.6		1.3		75.3		7.5
Public Utilities	192.0		7.9		142.2		20.7
Mortgage/Asset-Backed Securities	94.2		4.8		19.6		0.7
All Other Corporate Bonds	1,703.9		65.5		684.9		110.8
Redeemable Preferred Stocks	—		—		20.9		1.9
Total Fixed Maturity Securities	$	2,041.7	$	79.5	$	949.2	$	142.7

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, 2012
	(in millions of dollars)
	Total Amortized Cost		Unrealized Gain Position				Unrealized Loss Position
			Gross Gain		Fair Value		Gross Loss		Fair Value
1 year or less	$	990.2	$	23.4	$	988.7	$	0.1	$	24.8
Over 1 year through 5 years	5,613.8		590.6		6,014.8		7.6		182.0
Over 5 years through 10 years	9,776.2		1,623.1		11,051.4		17.0		330.9
Over 10 years	18,971.8		4,822.5		23,082.5		65.8		646.0
	35,352.0		7,059.6		41,137.4		90.5		1,183.7
Mortgage/Asset-Backed Securities	2,105.3		318.8		2,415.3		0.5		8.3
Total Fixed Maturity Securities	$	37,457.3	$	7,378.4	$	43,552.7	$	91.0	$	1,192.0

Note 4 - Investments - Continued

	December 31, 2011
	(in millions of dollars)
	Total Amortized Cost		Unrealized Gain Position				Unrealized Loss Position
			Gross Gain		Fair Value		Gross Loss		Fair Value
1 year or less	$	715.1	$	16.0	$	701.4	$	0.1	$	29.6
Over 1 year through 5 years	5,161.5		449.8		4,949.0		20.7		641.6
Over 5 years through 10 years	9,630.5		1,266.3		9,903.8		52.8		940.2
Over 10 years	18,499.0		3,992.0		21,082.2		143.1		1,265.7
	34,006.1		5,724.1		36,636.4		216.7		2,877.1
Mortgage/Asset-Backed Securities	2,634.6		344.1		2,859.4		5.5		113.8
Total Fixed Maturity Securities	$	36,640.7	$	6,068.2	$	39,495.8	$	222.2	$	2,990.9

At September 30, 2012, the fair value of investment-grade fixed maturity securities was $41,593.8 million, with a gross unrealized gain of $7,193.5 million and a gross unrealized loss of $38.0 million. The gross unrealized loss on investment-grade fixed maturity securities was 41.8 percent of the total gross unrealized loss on fixed maturity securities. 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.

At September 30, 2012, the fair value of below-investment-grade fixed maturity securities was $3,150.9 million, with a gross unrealized gain of $184.9 million and a gross unrealized loss of $53.0 million. The gross unrealized loss on below-investment-grade fixed maturity securities was 58.2 percent of the total gross unrealized loss on fixed maturity securities. Generally, below-investment-grade fixed maturity securities are more likely to develop credit concerns than investment-grade securities. At September 30, 2012, 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 an other-than-temporary impairment will recover in value.

As of September 30, 2012, we held 36 individual investment-grade fixed maturity securities and 35 individual below-investment-grade fixed maturity securities that were in an unrealized loss position, of which 22 investment-grade fixed maturity securities and 20 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 is other than temporary, 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

• The time period during which there has been a significant 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

Note 4 - Investments - Continued

We evaluate available information, including the factors noted above, both positive and negative, in reaching our conclusions. In particular, we also consider the strength of the issuer's balance sheet, its debt obligations and near term funding requirements, 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. Although available and applicable factors are considered in our analysis, our expectation of recovering the entire amortized cost basis of the security, whether we intend to sell the security, whether it is more likely than not we will be required to sell the security before recovery of its amortized cost, and whether the security is current on principal and interest payments are the most critical factors in determining whether impairments are other than temporary. The significance of the decline in value and the length of time during which there has been a significant decline are also important factors, but we generally do not record an impairment loss based solely on these two factors, since often other more relevant factors will impact our evaluation of a security.

While determining other-than-temporary impairments 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 problem investments and the recording of losses on a timely basis for investments determined to have an other-than-temporary impairment.

If we determine that the decline in value of an investment is other than temporary, the investment is written down to fair value, and an impairment loss is recognized in the current period, either in earnings or in both earnings and other comprehensive income, as applicable. For those fixed maturity securities with an unrealized loss for which we have not recognized an other-than-temporary impairment, we believe we will recover the entire amortized cost, we do not intend to sell the security, and we do not believe it is more likely than not we will be required to sell the security before recovery of its amortized cost. There have been no defaults in the repayment obligations of any securities for which we have not recorded an other-than-temporary impairment.

Other-than-temporary impairment losses on fixed maturity securities which we intend to sell or more likely than not will be required to sell before recovery in value are recognized in earnings and equal the entire difference between the security's amortized cost basis and its fair value. For securities which we do not intend to sell and it is not more likely than not that we will be required to sell before recovery in value, other-than-temporary impairment losses recognized in earnings generally represent the difference between the amortized cost of the security and 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.  The determination of cash flows is inherently subjective, and methodologies may vary depending on the circumstances specific to the security. The timing and amount of our cash flow estimates are developed using historical and forecast financial information from the issuer, including its current and projected liquidity position. We also consider industry analyst reports and forecasts, sector credit ratings, future business prospects and earnings trends, issuer refinancing capabilities, actual and/or potential asset sales by the issuer, and other data relevant to the collectibility of the contractual cash flows of the security. We take into account the probability of default, expected recoveries, third party guarantees, quality of collateral, and where our debt security ranks in terms of subordination. We may use the estimated fair value of collateral as a proxy for the present value of cash flows if we believe the security is dependent on the liquidation of collateral for recovery of our investment.  For fixed maturity securities for which we have recognized an other-than-temporary impairment loss through earnings, if through subsequent evaluation there is a significant increase in expected cash flows, the difference between the new amortized cost basis and the cash flows expected to be collected is accreted as net investment income.

Note 4 - Investments - Continued

The following table presents the before-tax credit related portion of other-than-temporary impairments on fixed maturity securities still held for which a portion of an other-than-temporary impairment was recognized in other comprehensive income. The fixed maturity security to which the impairment pertained was sold during the three months ended March 31, 2011. We held no fixed maturity securities during the three months ended September 30, 2011, as of the beginning of 2012, or during the nine months ended September 30, 2012 for which a portion of an other-than-temporary impairment was previously recognized in other comprehensive income.

	Nine Months Ended
	September 30, 2011
	(in millions of dollars)
Balance at Beginning of Year	$	8.5
Sales or Maturities of Securities	(8.5		)
Balance at End of Period	$	—

At September 30, 2012, we had non-binding commitments of $125.0 million to fund private placement fixed maturity securities. 

Variable Interest Entities

We invest in variable interests issued by variable interest entities. These investments include tax credit partnerships, private equity 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, 2012, the carrying amount of our variable interest entity investments that are not consolidated under the provisions of GAAP was $452.1 million, comprised of $337.4 million of tax credit partnerships and $114.7 million of private equity partnerships. These variable interest entity investments are reported as other long-term investments in our consolidated balance sheets.

Additionally, we recognize a liability for all legally binding unfunded commitments to these partnerships, with a corresponding recognition of an invested asset.  Our liability for legally binding unfunded commitments to the tax credit partnerships was $112.2 million at September 30, 2012. Contractually, we are a limited partner in these investments, and our maximum exposure to loss is limited to the carrying value of our investment. We had non-binding commitments of $73.1 million to fund certain private equity partnerships at September 30, 2012, the amount of which may or may not be funded.

We are the sole beneficiary of a special purpose entity which is consolidated under the provisions of GAAP.  This entity is a securitized asset trust containing a highly rated bond for principal protection, nonredeemable preferred stock, and several partnership equity investments.  We contributed the bond and partnership investments into the trust at the time it was established.  The trust supports our investment objectives and allows us to maintain our investment in the partnerships while at the same time protecting the principal of the investment.  There are no restrictions on the assets held in this trust, and the trust is free to dispose of the assets at any time.  Because the assets in the trust are not liquid investments, we periodically provide funding to the underlying partnerships in the trust upon satisfaction of contractual notice from the partnerships.  The fair values of the bond, nonredeemable preferred stock, and partnerships were $140.2 million, $0.1 million, and $8.2 million, respectively, as of September 30, 2012.  The bonds are reported as fixed maturity securities, and the nonredeemable preferred stock and partnerships are reported as other long-term investments in our consolidated balance sheets. At September 30, 2012, we had no commitments to fund the underlying partnerships, nor did we fund any amounts to the partnerships during the three and nine months ended September 30, 2012 and 2011.

Note 4 - Investments - Continued

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 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.

Mortgage loans by property type and geographic region are as follows:

	September 30, 2012				December 31, 2011
	Carrying		Percent of		Carrying		Percent of
	Amount		Total		Amount		Total
	(in millions of dollars)
Property Type
Apartment	$	34.3	2.1	%	$	28.0	1.8	%
Industrial	528.4		31.7		502.0		31.1
Mixed	78.9		4.7		93.5		5.8
Office	677.1		40.7		659.3		40.9
Retail	346.5		20.8		322.4		20.0
Other	—		—		7.1		0.4
Total	$	1,665.2	100.0	%	$	1,612.3	100.0	%

Region
New England	$	132.4	8.0	%	$	147.0	9.1	%
Mid-Atlantic	161.2		9.7		174.1		10.8
East North Central	212.1		12.7		212.7		13.2
West North Central	147.3		8.8		151.2		9.4
South Atlantic	418.6		25.2		383.8		23.8
East South Central	80.1		4.8		52.4		3.3
West South Central	173.1		10.4		160.4		9.9
Mountain	81.9		4.9		69.5		4.3
Pacific	258.5		15.5		261.2		16.2
Total	$	1,665.2	100.0	%	$	1,612.3	100.0	%

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

• Loan-to-value ratio

• 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

Note 4 - Investments - Continued

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 credit quality ratings on an annual basis. This review process is performed more frequently for mortgage loans deemed to have a higher risk of delinquency.

Mortgage loans, sorted by the applicable credit quality indicators, are as follows:

	September 30		December 31
	2012		2011
	(in millions of dollars)
Internal Rating
Aa	$	11.7	$	10.9
A	655.8		712.6
Baa	951.0		855.0
Ba	29.4		20.7
B	17.3		13.1
Total	$	1,665.2	$	1,612.3

Loan-to-Value Ratio
<= 65%	$	648.6	$	578.4
> 65% <= 75%	781.9		802.3
> 75% <= 85%	186.8		165.1
> 85% <= 100%	47.9		66.5
Total	$	1,665.2	$	1,612.3

Based on an analysis of the above risk factors, as well as other current information, if we determine that it is probable we will be unable to collect all amounts due under the contractual terms of the mortgage loan, we establish an allowance for credit loss. If we expect to foreclose on the property, the amount of the allowance typically equals the excess carrying value of the mortgage loan over the fair value of the underlying collateral. If we expect to retain the mortgage loan until payoff, the allowance equals the excess carrying value of the mortgage loan over the expected future cash flows of the loan. The projection of future cash flows or a determination that the borrower can make the contractual payments is inherently subjective, and methodologies may vary depending on the circumstances specific to the loan. Additions and reductions to our allowance for credit losses on mortgage loans are reported as a component of net realized investment gains and losses. There have been no changes to our accounting policies or methodology from the prior period regarding estimating the allowance for credit losses on our mortgage loans.

The activity in the allowance for credit losses is as follows:

	Three Months Ended September 30				Nine Months Ended September 30
	2012		2011		2012			2011
	(in millions of dollars)
Balance at Beginning of Period	$	1.5	$	1.5	$	1.5		$	1.5
Provision	1.3		—		1.8			—
Charge-offs, Net of Recoveries	—		—		(0.5		)	—
Balance at End of Period	$	2.8	$	1.5	$	2.8		$	1.5

Note 4 - Investments - Continued

Impaired mortgage loans are as follows:

	September 30, 2012
	(in millions of dollars)
			Unpaid
	Recorded		Principal		Related
	Investment		Balance		Allowance
With No Related Allowance Recorded	$	4.3	$	4.3	$	—
With an Allowance Recorded	17.3		20.1		2.8
Total	$	21.6	$	24.4	$	2.8
	December 31, 2011
	(in millions of dollars)
			Unpaid
	Recorded		Principal		Related
	Investment		Balance		Allowance
With No Related Allowance Recorded	$	9.4	$	9.4	$	—
With an Allowance Recorded	13.1		14.6		1.5
Total	$	22.5	$	24.0	$	1.5

Our average investment in impaired mortgage loans was $15.9 million and $18.8 million, respectively, for the three and nine months ended September 30, 2012 and $26.4 million and $20.9 million, respectively, for the three and nine months ended September 30, 2011. Interest income recognized on mortgage loans subsequent to impairment was $0.2 million and $0.6 million, respectively, for each of the three and nine month periods ended September 30, 2012 and 2011.

We had no troubled debt restructurings during the three months ended September 30, 2012 and 2011. Our troubled debt restructurings during the nine months ended September 30, 2012 and 2011 were comprised entirely of loan foreclosures. A summary of our troubled debt restructurings is as follows:

	Nine Months Ended September 30
	2012		2011
	(in millions of dollars)
Carrying Amount	$	13.1	$	9.8
Number of Loans	2		1

We had no realized losses on loan foreclosures during the nine months ended September 30, 2012 and 2011 other than the initial impairment losses realized prior to foreclosure.

For mortgage loans that are past due regarding principal and/or interest payments and for which collection of investment income is uncertain, we discontinue the accrual of investment income. At September 30, 2012, we held one mortgage loan for which we had discontinued the accrual of investment income that was greater than 60 days past due and had a carrying value of $4.2 million. At December 31, 2011, we held one such mortgage loan that was greater than 90 days past due and had a carrying value of $9.4 million.

At September 30, 2012, we had non-binding commitments of $117.1 million to fund certain commercial mortgage loans, the amount of which may or may not be funded.

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.

Note 4 - Investments - Continued

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. Generally, cash is received as collateral under these agreements and is typically reinvested in short-term investments. In the event that securities are received as collateral, we are not permitted to sell or re-post them.

We account for all of our securities lending agreements and repurchase agreements as collateralized financings. As of September 30, 2012, the carrying amount of fixed maturity securities loaned to third parties under our securities lending program was $457.3 million, for which we received collateral in the form of cash and securities of $458.3 million and $15.7 million, respectively. As of December 31, 2011, the carrying amount of fixed maturity securities loaned to third parties under our securities lending program was $319.1 million, for which we received collateral in the form of cash and securities of $312.3 million and $16.7 million, respectively. We had no outstanding repurchase agreements at September 30, 2012 or December 31, 2011.

Realized Investment Gain and Loss

Realized investment gains and losses reported in our consolidated statements of income are as follows:

	Three Months Ended September 30						Nine Months Ended September 30
	2012			2011			2012			2011
	(in millions of dollars)
Fixed Maturity Securities
Gross Gains on Sales	$	4.6		$	14.8		$	14.0		$	33.0
Gross Losses on Sales	(2.3		)	(5.4		)	(9.0		)	(22.1		)
Other-Than-Temporary Impairment Loss	—			(1.2		)	—			(4.2		)
Mortgage Loans and Other Invested Assets
Gross Gains on Sales	2.3			1.6			2.3			7.1
Gross Losses on Sales	—			—			—			(0.2		)
Impairment Loss	(1.3		)	(0.4		)	(1.8		)	(0.4		)
Embedded Derivative in Modified Coinsurance Arrangement	19.7			(33.7		)	28.7			(24.4		)
Foreign Currency Transactions	(1.7		)	0.4			(2.6		)	(1.1		)
Net Realized Investment Gain (Loss)	$	21.3		$	(23.9	)	$	31.6		$	(12.3	)

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Derivative Financial Instruments

9 Months Ended

Sep. 30, 2012

Notes to Financial Statements [Abstract]

Derivative Financial Instruments

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, and foreign currency risk. Historically, we have utilized current and forward interest rate swaps and options on forward interest rate swaps, current and forward currency swaps, forward treasury locks, currency forward contracts, and forward contracts on specific fixed income securities. Hedging transactions 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.

Our cash flow hedging programs are as follows:

• Interest rate swaps are 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. The purpose of these swaps is 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 use interest rate swaps to hedge the potential adverse impact of rising interest rates in anticipation of issuing fixed rate long-term debt.

• Foreign currency interest rate swaps have historically been used to hedge the currency risk of certain foreign currency-denominated fixed maturity securities owned for portfolio diversification and to hedge the currency risk associated with certain of the interest payments and debt repayments of the U.S. dollar-denominated debt issued by one of our U.K. subsidiaries. For hedges of fixed maturity securities, 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. For hedges of debt issued, we agree to pay, at specified intervals, fixed rate foreign currency-denominated principal and interest payments to the counterparty in exchange for fixed rate U.S. dollar-denominated interest payments.

• Forward treasury locks are used to minimize interest rate risk associated with the anticipated purchase or disposal of fixed maturity securities. A forward treasury lock is a derivative contract without an initial investment where we and the counterparty agree to purchase or sell a specific U.S. Treasury bond at a future date at a pre-determined price.

• Foreign currency forward contracts are used to minimize foreign currency risks. 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 have used these forward contracts to hedge the foreign currency risk associated with certain of the debt repayments of the U.S. dollar-denominated debt issued by one of our U.K. subsidiaries and to hedge the currency risk of certain foreign currency-denominated fixed maturity securities owned for diversification purposes.

Our fair value hedging programs are as follows:

• Interest rate swaps are used to effectively convert certain of our fixed rate securities into floating rate securities which are used to fund our floating rate long-term debt. Under these swap agreements, we receive a variable rate of interest and pay a fixed rate of interest. Additionally, we use interest rate swaps to effectively convert certain fixed rate long-term debt into floating rate long-term debt. Under these swap agreements, we receive a fixed rate of interest and pay a variable rate of interest.

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. Our current credit exposure on derivatives, which is limited to the value of those contracts in a net gain position less collateral held, was $9.8 million at September 30, 2012. We held cash collateral of $15.3 million and $45.6 million from our counterparties as of September 30, 2012 and December 31, 2011, respectively. This unrestricted cash collateral is included in short-term investments, and the associated obligation to return the collateral to our counterparties is included in other liabilities in our consolidated balance sheets. We post either fixed maturity securities or cash as collateral to our counterparties. The carrying value of fixed maturity securities posted as collateral to our counterparties was $129.4 million and $114.9 million at September 30, 2012 and December 31, 2011, respectively. We had no cash posted as collateral to our counterparties at September 30, 2012 and December 31, 2011.

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 $182.5 million and $173.7 million at September 30, 2012 and December 31, 2011, respectively.

Hedging Activity

The table below summarizes, by notional amounts, the activity for each category of derivatives.

	Swaps
	Receive Variable/Pay Fixed		Receive Fixed/Pay Fixed		Receive Fixed/Pay Variable		Forwards		Total
			(in millions of dollars)
Balance at June 30, 2011	$	174.0	$	579.7	$	785.0	$	—	$	1,538.7
Additions	—		—		—		15.0		15.0
Terminations	—		5.0		50.0		—		55.0
Balance at September 30, 2011	$	174.0	$	574.7	$	735.0	$	15.0	$	1,498.7
Balance at December 31, 2010	$	174.0	$	617.9	$	890.0	$	—	$	1,681.9
Additions	—		—		—		46.9		46.9
Terminations	—		43.2		155.0		31.9		230.1
Balance at September 30, 2011	$	174.0	$	574.7	$	735.0	$	15.0	$	1,498.7
Balance at June 30, 2012	$	174.0	$	540.5	$	595.0	$	—	$	1,309.5
Additions	—		—		250.0		25.0		275.0
Terminations	—		26.3		45.0		—		71.3
Balance at September 30, 2012	$	174.0	$	514.2	$	800.0	$	25.0	$	1,513.2
Balance at December 31, 2011	$	174.0	$	554.0	$	685.0	$	—	$	1,413.0
Additions	—		—		250.0		81.0		331.0
Terminations	—		39.8		135.0		56.0		230.8
Balance at September 30, 2012	$	174.0	$	514.2	$	800.0	$	25.0	$	1,513.2

The following table summarizes the timing of anticipated settlements of interest rate swaps outstanding under our cash flow hedging programs at September 30, 2012, whereby we receive a fixed rate and pay a variable rate. The weighted average variable interest rates assume current market conditions.

	2012			2013			Total
	(in millions of dollars)
Notional Value	$	50.0		$	150.0		$	200.0
Weighted Average Receive Rate	6.50		%	6.34		%	6.38		%
Weighted Average Pay Rate	0.36		%	0.36		%	0.36		%

Cash Flow Hedges

As of September 30, 2012 and December 31, 2011, we had $200.0 million and $335.0 million, respectively, notional amount of forward starting interest rate swaps to hedge the anticipated purchase of fixed maturity securities and $514.2 million and $554.0 million, respectively, notional amount of open current and forward foreign currency swaps to hedge fixed income foreign currency-denominated securities.

As of September 30, 2012, we had $25.0 million notional amount of open forward treasury locks to hedge the interest rate risk associated with the anticipated proceeds to be received from the call of specific fixed maturity securities. We had no open forward treasury locks at December 31, 2011.

For the three and nine months ended September 30, 2012 and 2011, there was no material ineffectiveness related to our cash flow hedges, and no component of the derivative instruments' gain or loss was excluded from the assessment of hedge effectiveness.

As of September 30, 2012, we expect to amortize approximately $39.8 million of net deferred gains on derivative instruments during the next twelve months. This amount will be reclassified from accumulated other comprehensive income 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. The estimated amortization includes the impact of certain derivative contracts that have not yet been terminated as of September 30, 2012. Fluctuations in fair values of these derivatives between September 30, 2012 and the date of termination will vary our projected amortization. Amounts that will be reclassified from accumulated other comprehensive income into earnings to offset the earnings impact of foreign currency translation of hedged items are not estimable.

As of September 30, 2012, we are hedging the variability of future cash flows associated with forecasted transactions through the year 2038.

Fair Value Hedges

As of September 30, 2012 and December 31, 2011, we had $174.0 million notional amount of receive variable, pay fixed interest rate swaps to hedge the changes in fair value of certain fixed rate securities held. These swaps effectively convert the associated fixed rate securities into floating rate securities, which are used to fund our floating rate long-term debt. Changes in the fair value of the derivative and changes in the fair value of the hedged item attributable to the risk being hedged are recognized in current earnings as a component of net realized investment gain or loss during the period of change in fair value.  The change in fair value of the hedged fixed maturity securities attributable to the hedged benchmark interest rate resulted in gains of $0.2 million and $0.4 million for the three and nine months ended September 30, 2012, respectively, and $7.6 million and $8.7 million for the three and nine months ended September 30, 2011, respectively, with offsetting losses on the related interest rate swaps.

As of December 31, 2011, we had a $350.0 million notional amount receive fixed, pay variable interest rate swap to hedge the changes in the fair value of certain fixed rate long-term debt and entered into another $250.0 million swap during the third quarter of 2012, for a total of $600.0 million. These swaps effectively convert the associated fixed rate long-term debt into floating rate debt and provides for a better matching of interest rates with our short-term investments, which have frequent interest rate resets similar to a floating rate security. The change in fair value of the hedged debt attributable to the hedged benchmark interest rate resulted in a loss of $4.1 million and $8.3 million for the three and nine months ended September 30, 2012 and $14.8 million and $22.0 million for the three and nine months ended September 30, 2011, respectively, with offsetting gains on the related interest rate swaps.

For the three and nine months ended September 30, 2012 and 2011, there was no material ineffectiveness related to our fair value hedges, and no component of the derivative instruments' gain or loss 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

We have an embedded derivative in a modified coinsurance arrangement for which we include in our realized 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 location and fair values of derivative financial instruments, as reported in our consolidated balance sheets.

	September 30, 2012
	(in millions of dollars)
	Asset Derivatives			Liability Derivatives
	Balance Sheet Location	Fair Value		Balance Sheet Location	Fair Value
Designated as Hedging Instruments
Interest Rate Swaps and Forwards	Other L-T Investments	$	101.3	Other Liabilities	$	33.3
Foreign Exchange Contracts	Other L-T Investments	6.9		Other Liabilities	149.2
Total		$	108.2		$	182.5
Not Designated as Hedging Instruments
Embedded Derivative in Modified Coinsurance Arrangement				Other Liabilities	$	107.0

	December 31, 2011
	(in millions of dollars)
	Asset Derivatives			Liability Derivatives
	Balance Sheet Location	Fair Value		Balance Sheet Location	Fair Value
Designated as Hedging Instruments
Interest Rate Swaps	Other L-T Investments	$	134.2	Other Liabilities	$	32.9
Foreign Exchange Contracts	Other L-T Investments	3.5		Other Liabilities	140.8
Total		$	137.7		$	173.7
Not Designated as Hedging Instruments
Embedded Derivative in Modified Coinsurance Arrangement				Other Liabilities	$	135.7

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

	Three Months Ended September 30, 2012
	Gain (Loss) Recognized in OCI on Derivatives (Effective Portion)			Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)
	(in millions of dollars)
Interest Rate Swaps	$	20.2		$	11.7		(1)
Interest Rate Swaps	—			0.1			(2)
Interest Rate Swaps	—			(0.5		)	(3)
Foreign Exchange Contracts	—			(0.1		)	(1)
Foreign Exchange Contracts	(14.7		)	(16.7		)	(2)
Total	$	5.5		$	(5.5	)

(1) Gain (loss) recognized in net investment income

(2) Gain (loss) recognized in net realized investment gain (loss)

(3) Loss recognized in interest and debt expense

	Three Months Ended September 30, 2011
	Gain Recognized in OCI on Derivatives (Effective Portion)		Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)
	(in millions of dollars)
Interest Rate Swaps and Forwards	$	8.0	$	8.6		(1)
Interest Rate Swaps	—		0.7			(2)
Interest Rate Swaps	—		(0.4		)	(3)
Foreign Exchange Contracts	—		(0.3		)	(1)
Foreign Exchange Contracts	51.4		46.6			(2)
Total	$	59.4	$	55.2

(1) Gain (loss) recognized in net investment income

(2) Gain recognized in net realized investment gain (loss)

(3) Loss recognized in interest and debt expense

	Nine Months Ended September 30, 2012
	Gain (Loss) Recognized in OCI on Derivatives (Effective Portion)			Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)
	(in millions of dollars)
Interest Rate Swaps and Forwards	$	55.1		$	30.4		(1)
Interest Rate Swaps	—			2.2			(2)
Interest Rate Swaps	—			(1.3		)	(3)
Foreign Exchange Contracts	—			(0.9		)	(1)
Foreign Exchange Contracts	(4.9		)	(18.6		)	(2)
Total	$	50.2		$	11.8

(1) Gain (loss) recognized in net investment income

(2) Gain (loss) recognized in net realized investment gain (loss)

(3) Loss recognized in interest and debt expense

	Nine Months Ended September 30, 2011
	Gain Recognized in OCI on Derivatives (Effective Portion)		Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)
	(in millions of dollars)
Interest Rate Swaps and Forwards	$	35.4	$	26.0		(1)
Interest Rate Swaps	—		2.5			(2)
Interest Rate Swaps	—		(1.2		)	(3)
Foreign Exchange Contracts	—		(0.9		)	(1)
Foreign Exchange Contracts	40.9		22.0			(2)
Total	$	76.3	$	48.4

(1) Gain (loss) recognized in net investment income

(2) Gain recognized in net realized investment gain (loss)

(3) Loss recognized in interest and debt expense

The following table summarizes the location of and gains (losses) on our embedded derivative in a modified coinsurance arrangement, as reported in our consolidated statements of income.

	Three Months Ended September 30					Nine Months Ended September 30
	2012		2011			2012		2011
	(in millions of dollars)
Gain (Loss) Recognized in Net Realized Investment Gain (Loss)	$	19.7	$	(33.7	)	$	28.7	$	(24.4	)

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Pensions and Other Postretirement Benefits

9 Months Ended

Sep. 30, 2012

Notes to Financial Statements [Abstract]

Pensions and Other Postretirement Benefits

Pensions and Other Postretirement Benefits

The components of net periodic benefit cost related to the Company sponsored defined benefit pension and other postretirement benefit plans (OPEB) for our employees are as follows:

	Three Months Ended September 30
	Pension Benefits
	U.S. Plans						Non U.S. Plans						OPEB
	2012			2011			2012			2011			2012			2011
	(in millions of dollars)
Service Cost	$	12.2		$	10.7		$	1.2		$	1.1		$	0.4		$	0.5
Interest Cost	21.1			19.4			2.2			2.3			2.3			2.5
Expected Return on Plan Assets	(22.2		)	(21.9		)	(2.8		)	(3.1		)	(0.2		)	(0.2		)
Amortization of:
Net Actuarial Loss	11.5			8.0			0.1			—			—			—
Prior Service Credit	(0.1		)	(0.1		)	—			—			(0.6		)	(0.6		)
Total	$	22.5		$	16.1		$	0.7		$	0.3		$	1.9		$	2.2

	Nine Months Ended September 30
	Pension Benefits
	U.S. Plans						Non U.S. Plans						OPEB
	2012			2011			2012			2011			2012			2011
	(in millions of dollars)
Service Cost	$	36.6		$	32.0		$	3.6		$	3.5		$	1.2		$	1.4
Interest Cost	63.3			58.2			6.4			6.7			7.1			7.5
Expected Return on Plan Assets	(66.5		)	(65.7		)	(8.3		)	(9.2		)	(0.5		)	(0.5		)
Amortization of:
Net Actuarial Loss	34.4			24.0			0.4			—			—			—
Prior Service Credit	(0.4		)	(0.4		)	—			—			(1.9		)	(1.9		)
Total	$	67.4		$	48.1		$	2.1		$	1.0		$	5.9		$	6.5

We have no regulatory contribution requirements for our U.S. qualified defined benefit plan in 2012, but we elected to make a $53.0 million voluntary contribution in the second quarter of 2012. For our U.K. operation, which maintains a separate defined benefit plan, we made required contributions of $1.0 million and $3.1 million in the third quarter and first nine months of 2012, respectively, or approximately £0.7 million and £2.0 million.

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Other Other - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011
2010 UK Tax Rate					27.00%
2011 New UK Tax rate					26.00%
Short-term Debt	$ 458.3		$ 458.3		$ 312.3
Repayments of Long-term Debt			45.6	66.9
Unrecognized Tax Benefits	32.2		32.2
Unrecognized Tax Benefits, Period Increase (Decrease)	61.1
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense	0.1	1.5	(10.5)	4.1
2012 UK Tax rate - old	25.00%		25.00%
2012 UK Tax rate - new	24.00%		24.00%
Ultimate UK Tax rate	23.00%		23.00%
Income Tax Reconciliation, Change in Enacted Tax Rate	9.3	6.8
Issuance of Debt [Member]
Long-term Debt	250.0		250.0
Unsecuredseniornotes5point75percentdue2042 [Member]
Debt Instrument, Interest Rate, Stated Percentage	5.75%		5.75%
Northwind Holdings LLC [Member]
Repayments of Long-term Debt			38.1
Tailwind Holdings LLC [Member]
Repayments of Long-term Debt			7.5
Minimum [Member]
Unrecognized Tax Benefits Reasonably Possible Decreases Resulting from Settlements with Taxing Authorities	17.2
Maximum [Member]
Unrecognized Tax Benefits Reasonably Possible Decreases Resulting from Settlements with Taxing Authorities	$ 22.0

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Fair Values of Financial Instruments - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying amount of policy loans	$ 3,117.0		$ 3,117.0		$ 3,051.4
Embedded Derivative in Modified Coinsurance Arrangement	19.7	(33.7)	28.7	(24.4)
Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Instrument, Fair Value Disclosure	472.7		472.7
Fair Value, Inputs, Level 1 [Member] | Pricing Service
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Percent of fixed maturity securities valued	15.30%		15.30%
Other Than Fair Value Inputs Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Percent of fixed maturity securities valued	84.70%		84.70%
Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Instrument, Fair Value Disclosure	2,455.9		2,455.9
Fair Value, Inputs, Level 2 [Member] | Pricing Service
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Percent of fixed maturity securities valued	68.70%		68.70%
Fair Value, Inputs, Level 2 [Member] | Other Observable Market Data
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Percent of fixed maturity securities valued	3.30%		3.30%
Fair Value Inputs Level 2 Or Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Percent of fixed maturity securities valued	12.70%		12.70%
Policy Loans Ceded
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying amount of policy loans	$ 2,897.5		$ 2,897.5		$ 2,838.3

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Location of Gains and Losses on Derivative Financial Instruments Designated as Cash Flow Hedging Instruments (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2012		Sep. 30, 2011		Sep. 30, 2012		Sep. 30, 2011
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in OCI on Derivatives (Effective Portion)	$ 5.5		$ 59.4		$ 50.2		$ 76.3
Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	(5.5)		55.2		11.8		48.4
Interest Rate Swaps and Forwards | Net Investment Income
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in OCI on Derivatives (Effective Portion)	20.2		8.0		55.1		35.4
Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	11.7	[1]	8.6	[1]	30.4	[1]	26.0	[1]
Interest Rate Swaps and Forwards | Net Realized Investment Gain (Loss)
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in OCI on Derivatives (Effective Portion)	0		0		0		0
Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	0.1	[2]	0.7	[3]	2.2	[3]	2.5	[3]
Interest Rate Swaps and Forwards | Interest and Debt Expenses
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in OCI on Derivatives (Effective Portion)	0		0		0		0
Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	(0.5)	[4]	(0.4)	[4]	(1.3)	[4]	(1.2)	[4]
Foreign Exchange Contracts | Net Investment Income
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in OCI on Derivatives (Effective Portion)	0		0		0		0
Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	(0.1)	[1]	(0.3)	[1]	(0.9)	[1]	(0.9)	[1]
Foreign Exchange Contracts | Net Realized Investment Gain (Loss)
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in OCI on Derivatives (Effective Portion)	(14.7)		51.4		(4.9)		40.9
Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	$ (16.7)	[2]	$ 46.6	[3]	$ (18.6)	[3]	$ 22.0	[3]

[1] Gain (loss) recognized in net investment income

[2] Gain (loss) recognized in net realized investment gain (loss)

[3] Gain recognized in net realized investment gain (loss)

[4] Loss recognized in interest and debt expense

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Fair Values of Financial Instruments (Tables)

9 Months Ended

Sep. 30, 2012

Notes to Financial Statements [Abstract]

Carrying Amount and Fair Value of Financial Instruments

Presented as follows are the carrying amounts and fair values of financial instruments. The carrying values of financial instruments such as short-term investments, cash and bank deposits, accounts and premiums receivable, accrued investment income, 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 following chart. Certain prior year amounts have been reclassified to conform to current presentation.

	September 30, 2012				December 31, 2011
	Carrying Amount		Fair Value		Carrying Amount		Fair Value
	(in millions of dollars)
Assets
Fixed Maturity Securities	$	44,744.7	$	44,744.7	$	42,486.7	$	42,486.7
Mortgage Loans	1,665.2		1,868.4		1,612.3		1,789.8
Policy Loans	3,117.0		3,199.6		3,051.4		3,124.4
Other Long-term Investments
Derivatives	108.2		108.2		137.7		137.7
Equity Securities	13.0		13.0		11.2		11.2
Miscellaneous Long-term Investments	460.3		460.3		436.4		436.4
Liabilities
Policyholders' Funds
Deferred Annuity Products	$	642.2	$	642.2	$	641.1	$	641.1
Supplementary Contracts without Life Contingencies	536.6		536.6		502.6		502.6
Long-term Debt	2,781.5		2,928.6		2,570.2		2,540.2
Other Liabilities
Derivatives	182.5		182.5		173.7		173.7
Embedded Derivative in Modified Coinsurance Arrangement	107.0		107.0		135.7		135.7
Unfunded Commitments to Investment Partnerships	112.2		112.2		160.6		160.6

Fair Value, Measurement Inputs, Disclosure

Fair value measurements by input level for financial instruments carried at fair value are as follows:

	September 30, 2012
	(in millions of dollars)
	Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
Assets
Fixed Maturity Securities
United States Government and Government Agencies and Authorities	$	539.5	$	836.9	$	—	$	1,376.4
States, Municipalities, and Political Subdivisions	44.0		1,578.5		110.1		1,732.6
Foreign Governments	20.6		1,368.3		46.1		1,435.0
Public Utilities	793.8		9,760.9		499.1		11,053.8
Mortgage/Asset-Backed Securities	—		2,415.2		8.4		2,423.6
All Other Corporate Bonds	5,425.6		20,364.2		894.6		26,684.4
Redeemable Preferred Stocks	24.3		14.6		—		38.9
Total Fixed Maturity Securities	6,847.8		36,338.6		1,558.3		44,744.7
Other Long-term Investments
Derivatives
Interest Rate Swaps and Forwards	—		101.3		—		101.3
Foreign Exchange Contracts	—		6.9		—		6.9
Total Derivatives	—		108.2		—		108.2
Equity Securities	—		8.6		4.4		13.0
Liabilities
Other Liabilities
Derivatives
Interest Rate Swaps	$	—	$	33.3	$	—	$	33.3
Foreign Exchange Contracts	—		149.2		—		149.2
Embedded Derivative in Modified Coinsurance Arrangement	—		—		107.0		107.0
Total Derivatives	—		182.5		107.0		289.5

Note 3 - Fair Values of Financial Instruments - Continued

	December 31, 2011
	(in millions of dollars)
	Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
Assets
Fixed Maturity Securities
United States Government and Government Agencies and Authorities	$	326.6	$	977.8	$	—	$	1,304.4
States, Municipalities, and Political Subdivisions	107.3		1,416.2		68.1		1,591.6
Foreign Governments	—		1,376.7		—		1,376.7
Public Utilities	718.0		9,576.4		338.9		10,633.3
Mortgage/Asset-Backed Securities	—		2,941.5		31.7		2,973.2
All Other Corporate Bonds	3,469.5		20,415.1		665.5		24,550.1
Redeemable Preferred Stocks	—		20.2		37.2		57.4
Total Fixed Maturity Securities	4,621.4		36,723.9		1,141.4		42,486.7
Other Long-term Investments
Derivatives
Interest Rate Swaps	—		134.2		—		134.2
Foreign Exchange Contracts	—		3.5		—		3.5
Total Derivatives	—		137.7		—		137.7
Equity Securities	—		—		11.2		11.2
Liabilities
Other Liabilities
Derivatives
Interest Rate Swaps	$	—	$	32.9	$	—	$	32.9
Foreign Exchange Contracts	—		140.8		—		140.8
Embedded Derivative in Modified Coinsurance Arrangement	—		—		135.7		135.7
Total Derivatives	—		173.7		135.7		309.4

Transfers of Assets between Level 1 and Level 2

Transfers of assets between Level 1 and Level 2 are as follows:

	Three Months Ended				Nine Months Ended
	September 30, 2012				September 30, 2012
	(in millions of dollars) Transfers into
	Level 1 from Level 2		Level 2 from Level 1		Level 1 from Level 2		Level 2 from Level 1
Fixed Maturity Securities
United States Government and Government Agencies and Authorities	$	426.8	$	60.5	$	205.9	$	20.5
States, Municipalities, and Political Subdivisions	43.0		62.9		41.9		74.8
Foreign Governments	21.7		—		20.7		—
Public Utilities	382.4		743.6		479.0		483.6
All Other Corporate Bonds	2,152.9		1,667.4		2,823.3		1,706.0
Total Fixed Maturity Securities	$	3,026.8	$	2,534.4	$	3,570.8	$	2,284.9
Equity Securities	$	—	$	7.4	$	—	$	—

	Three Months Ended				Nine Months Ended
	September 30, 2011				September 30, 2011
	(in millions of dollars) Transfers into
	Level 1 from Level 2		Level 2 from Level 1		Level 1 from Level 2		Level 2 from Level 1
Fixed Maturity Securities
United States Government and Government Agencies and Authorities	$	177.2	$	16.1	$	169.8	$	—
States, Municipalities, and Political Subdivisions	—		20.0		25.4		301.9
Foreign Governments	—		—		—		0.7
Public Utilities	665.7		694.8		710.5		488.6
All Other Corporate Bonds	1,798.1		2,347.2		2,334.1		1,732.3
Total Fixed Maturity Securities	$	2,641.0	$	3,078.1	$	3,239.8	$	2,523.5

Transfers between Level 1 and Level 2 occurred due to the change in availability of either a TRACE or broker market maker price. Depending on current market conditions, the availability of these Level 1 prices can vary from period to period. For fair value measurements of financial instruments that were transferred either into or out of Level 1 or 2, we reflect the transfers using the fair value at the beginning of the period.

Changes in Assets and Liabilities Measured at Fair Value on a Recurring Basis using Significant Unobservable Inputs (Level 3)

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, 2012
	(in millions of dollars)
				Total Realized and Unrealized Investment Gains Included in
	Beginning of Period			Earnings			Other Comprehensive Income or Loss			Purchases		Sales			Level 3 Transfers					End of Period
															Into		Out of
Fixed Maturity Securities
States, Municipalities, and Political Subdivisions	$	—		$	—		$	2.0		$	—	$	—		$	108.1	$	—		$	110.1
Foreign Governments	—			—			1.3			—		—			44.8		—			46.1
Public Utilities	162.8			—			8.4			—		(1.7		)	340.5		(10.9		)	499.1
Mortgage/Asset-Backed Securities	0.6			—			0.4			—		—			7.4		—			8.4
All Other Corporate Bonds	639.6			—			19.8			—		(5.3		)	386.7		(146.2		)	894.6
Redeemable Preferred Stocks	22.2			—			—			—		—			—		(22.2		)	—
Total Fixed Maturity Securities	825.2			—			31.9			—		(7.0		)	887.5		(179.3		)	1,558.3
Equity Securities	4.4			—			—			—		—			—		—			4.4
Embedded Derivative in Modified Coinsurance Arrangement	(126.7		)	19.7			—			—		—			—		—			(107.0		)
	Three Months Ended September 30, 2011
	(in millions of dollars)
				Total Realized and Unrealized Investment Gains (Losses) Included in
	Beginning of Period			Earnings			Other Comprehensive Income or Loss			Purchases		Sales			Level 3 Transfers					End of Period
															Into		Out of
Fixed Maturity Securities
Public Utilities	$	217.9		$	0.1		$	9.3		$	30.0	$	(11.9	)	$	220.2	$	(69.8	)	$	395.8
Mortgage/Asset-Backed Securities	19.7			—			(0.1		)	—		—			—		—			19.6
All Other Corporate Bonds	528.3			—			1.3			—		(17.6		)	119.6		(164.8		)	466.8
Redeemable Preferred Stocks	22.6			—			(0.9		)	—		—			—		—			21.7
Total Fixed Maturity Securities	788.5			0.1			9.6			30.0		(29.5		)	339.8		(234.6		)	903.9
Equity Securities	3.6			(0.4		)	(2.4		)	—		—			9.6		—			10.4
Embedded Derivative in Modified Coinsurance Arrangement	(87.0		)	(33.7		)	—			—		—			—		—			(120.7		)

Note 3 - Fair Values of Financial Instruments - Continued

	Nine Months Ended September 30, 2012
	(in millions of dollars)
				Total Realized and Unrealized Investment Gains (Losses) Included in
	Beginning of Year			Earnings			Other Comprehensive Income or Loss			Purchases		Sales			Level 3 Transfers					End of Period
															Into		Out of
Fixed Maturity Securities
States, Municipalities, and Political Subdivisions	$	68.1		$	—		$	(0.9	)	$	—	$	(0.3	)	$	43.2	$	—		$	110.1
Foreign Governments	—			—			5.2			—		—			40.9		—			46.1
Public Utilities	338.9			—			5.4			3.6		(3.7		)	361.7		(206.8		)	499.1
Mortgage/Asset-Backed Securities	31.7			—			0.9			7.0		(0.1		)	—		(31.1		)	8.4
All Other Corporate Bonds	665.5			—			34.0			30.2		(49.0		)	448.0		(234.1		)	894.6
Redeemable Preferred Stocks	37.2			(1.0		)	0.8			—		(14.3		)	—		(22.7		)	—
Total Fixed Maturity Securities	1,141.4			(1.0		)	45.4			40.8		(67.4		)	893.8		(494.7		)	1,558.3
Equity Securities	11.2			—			—			—		(0.1		)	—		(6.7		)	4.4
Embedded Derivative in Modified Coinsurance Arrangement	(135.7		)	28.7			—			—		—			—		—			(107.0		)
	Nine Months Ended September 30, 2011
	(in millions of dollars)
				Total Realized and Unrealized Investment Gains (Losses) Included in
	Beginning of Year			Earnings			Other Comprehensive Income or Loss			Purchases		Sales			Level 3 Transfers					End of Period
															Into		Out of
Fixed Maturity Securities
Public Utilities	$	173.6		$	0.1		$	17.1		$	30.0	$	(15.7	)	$	299.7	$	(109.0	)	$	395.8
Mortgage/Asset-Backed Securities	0.7			—			(0.4		)	19.4		(0.1		)	—		—			19.6
All Other Corporate Bonds	829.7			(2.1		)	4.7			41.7		(32.5		)	96.2		(470.9		)	466.8
Redeemable Preferred Stocks	21.7			—			—			—		—			—		—			21.7
Total Fixed Maturity Securities	1,025.7			(2.0		)	21.4			91.1		(48.3		)	395.9		(579.9		)	903.9
Equity Securities	1.5			(0.4		)	(1.7		)	2.0		—			9.0		—			10.4
Embedded Derivative in Modified Coinsurance Arrangement	(96.3		)	(24.4		)	—			—		—			—		—			(120.7		)

Note 3 - Fair Values of Financial Instruments - Continued

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. Gains (losses) which are included in earnings and are attributable to the change in unrealized gains or losses relating to assets or liabilities valued using significant unobservable inputs and still held at period end were $19.7 million and $28.7 million, respectively, for the three and nine months ended September 30, 2012 and $(33.7) million and $(24.4) million, respectively, for the three and nine months ended September 30, 2011. These amounts relate entirely to the changes in fair value of an embedded derivative in a modified coinsurance arrangement which are reported as realized investment gains and losses.

Level 3 Quantitative Sensitivity Analysis

Quantitative information regarding the significant unobservable inputs used in Level 3 fair value measurements, all of which are internally derived, is as follows:

	September 30, 2012
	(in millions of dollars)
	Fair Value			Unobservable Input		Range/Weighted Average
Fixed Maturity Securities
Public Utilities	$	17.4		- Comparability Adjustment	(b)	0.20% - 0.20%/0.20%
Mortgage/Asset-Backed Securities - Private	0.5			- Discount for Size	(c)	5.77% - 5.86%/5.84%
All Other Corporate Bonds - Private	485.1			- Change in Benchmark Reference - Comparability Adjustment - Discount for Size - Lack of Marketability - Volatility of Credit - Market Convention	(a) (b) (c) (d) (e) (f)	(0.05)% - 2.60%/0.15% (0.50)% - (0.50)%/(0.50)% 0.50% - 0.50%/0.50% 0.01% - 1.00%/0.22% (0.50)% - 6.92%/1.37% Priced at Par
All Other Corporate Bonds - Public	115.9			- Comparability Adjustment - Discount for Size - Lack of Marketability - Volatility of Credit - Market Convention	(b) (c) (d) (e) (f)	(1.24)% - 0.50%/(0.16)% 0.00% - 0.10%/0.04% 0.01% - 0.40%/0.19% 0.01% - 0.01%/0.01% Priced at Par
Equity Securities - Private	4.1			- Market Convention	(f)	Priced at Cost or Owner's Equity
Embedded Derivative in Modified Coinsurance Arrangement	(107.0		)	- Projected Liability Cash Flows	(g)	Actuarial Assumptions

(a) Represents basis point adjustments for changes in benchmark spreads associated with various ratings categories

(b) Represents basis point adjustments for changes in benchmark spreads associated with various industry sectors

(c) Represents basis point adjustments based on issue/issuer size relative to the benchmark

(d) Represents basis point adjustments to apply a discount due to the illiquidity of an investment

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

(f) Represents a decision to price based on par value, cost, or owner's equity when limited data is available

(g) Represents various actuarial assumptions required to derive the liability cash flows including incidence, termination, and lapse rates

Isolated increases in unobservable inputs other than market convention will result in a lower fair value measurement, whereas isolated decreases will result in a higher fair value measurement. 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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Stockholders' Equity and Earnings Per Common Share (Tables)

9 Months Ended

Sep. 30, 2012

Earnings Per Share, Basic and Diluted [Abstract]

Net Income Per Common Share

Net income per common share is determined as follows:

	Three Months Ended September 30				Nine Months Ended September 30
	2012		2011		2012		2011
	(in millions of dollars, except share data)
Numerator
Net Income	$	230.2	$	202.0	$	660.5	$	653.2
Denominator (000s)
Weighted Average Common Shares - Basic	278,354.4		298,185.8		284,012.8		305,694.5
Dilution for Assumed Exercises of Stock Options and Nonvested Stock Awards	156.6		987.1		478.4		1,223.9
Weighted Average Common Shares - Assuming Dilution	278,511.0		299,172.9		284,491.2		306,918.4
Net Income Per Common Share
Basic	$	0.83	$	0.68	$	2.33	$	2.14
Assuming Dilution	$	0.83	$	0.68	$	2.32	$	2.13

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Timing of Anticipated Settlements of Interest Rate Swaps Outstanding (Detail) (USD $)	Sep. 30, 2012	Jun. 30, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Dec. 31, 2010
Derivative [Line Items]
Notional Amount of Derivatives	$ 1,513,200,000	$ 1,309,500,000	$ 1,413,000,000	$ 1,498,700,000	$ 1,538,700,000	$ 1,681,900,000
2012
Derivative [Line Items]
Notional Amount of Derivatives	50,000,000
Weighted Average Receive Rate	6.50%
Weighted Average pay rate	0.36%
2013
Derivative [Line Items]
Notional Amount of Derivatives	150,000,000
Weighted Average Receive Rate	6.34%
Weighted Average pay rate	0.36%
Receive Fixed/Pay Variable
Derivative [Line Items]
Notional Amount of Derivatives	$ 200,000,000
Weighted Average Receive Rate	6.38%
Weighted Average pay rate	0.36%

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Mortgage Loans, Sorted by Applicable Credit Quality Indicators, Internal rating (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans	$ 1,665.2	$ 1,612.3
Aa
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans	11.7	10.9
A
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans	655.8	712.6
Baa
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans	951.0	855.0
Ba
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans	29.4	20.7
B
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans	$ 17.3	$ 13.1

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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Net Income	$ 230.2	$ 202.0	$ 660.5	$ 653.2
Change in Net Unrealized Gain on Securities Before Reclassification Adjustment:
Change in Net Unrealized Gain on Securities Not Other-Than-Temporarily Impaired (net of tax expense of $303.1; $599.6; $496.5; $754.9)	596.8	1,124.5	965.0	1,419.0
Change in Net Unrealized Gain on Securities Other-Than-Temporarily Impaired (net of tax benefit of $-; $-; $-; $1.1)	0	0	0	(2.1)
Total Change in Net Unrealized Gain on Securities Before Reclassification Adjustment (net of tax expense of $303.1; $599.6; $496.5; $753.8)	596.8	1,124.5	965.0	1,416.9
Reclassification Adjustment for Net Realized Investment Gain (net of tax expense of $1.4; $3.4; $2.0; $4.6)	(2.6)	(5.3)	(4.0)	(7.7)
Change in Net Gain on Cash Flow Hedges (net of tax expense (benefit) of ($6.0); $34.7; ($5.3); $32.0)	(10.3)	65.2	(8.4)	60.1
Change in Adjustment to Reserves for Future Policy and Contract Benefits, Net of Reinsurance and Other (net of tax benefit of $213.5; $377.6; $344.0; $498.8)	(430.1)	(703.3)	(683.6)	(931.2)
Change in Foreign Currency Translation Adjustment	29.4	(33.8)	39.0	(6.0)
Change in Unrecognized Pension and Postretirement Benefit Costs (net of tax expense of $3.5; $2.8; $11.0; $6.9)	6.6	5.2	20.5	15.0
Total Other Comprehensive Income	189.8	452.5	328.5	547.1
Comprehensive Income	$ 420.0	$ 654.5	$ 989.0	$ 1,200.3

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Basis of Presentation

9 Months Ended

Sep. 30, 2012

Basis of Presentation [Abstract]

Basis of Presentation

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, 2011.

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.

In connection with our preparation of the consolidated financial statements, we evaluated events that occurred subsequent to September 30, 2012 for recognition or disclosure in our financial statements and notes to our financial statements.

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Pensions and Other Postretirement Benefits Net Periodic Benefit Cost (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Amortization of Actuarial Loss	$ 11.6	$ 8.0	$ 34.8	$ 24.0
Pension Benefits, U.S. Plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service Cost	12.2	10.7	36.6	32.0
Interest Cost	21.1	19.4	63.3	58.2
Expected Return on Plan Assets	(22.2)	(21.9)	(66.5)	(65.7)
Amortization of Actuarial Loss	11.5	8.0	34.4	24.0
Amortization of Prior Service Credit	(0.1)	(0.1)	(0.4)	(0.4)
Total	22.5	16.1	67.4	48.1
Pension Benefits, Non U.S. Plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service Cost	1.2	1.1	3.6	3.5
Interest Cost	2.2	2.3	6.4	6.7
Expected Return on Plan Assets	(2.8)	(3.1)	(8.3)	(9.2)
Amortization of Actuarial Loss	0.1	0	0.4	0
Amortization of Prior Service Credit	0	0	0	0
Total	0.7	0.3	2.1	1.0
Other Postretirement Benefit Plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service Cost	0.4	0.5	1.2	1.4
Interest Cost	2.3	2.5	7.1	7.5
Expected Return on Plan Assets	(0.2)	(0.2)	(0.5)	(0.5)
Amortization of Actuarial Loss	0	0	0	0
Amortization of Prior Service Credit	(0.6)	(0.6)	(1.9)	(1.9)
Total	$ 1.9	$ 2.2	$ 5.9	$ 6.5

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Accounting Developments - ASU Impact (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Deferred Acquisition Costs	$ 1,728.3		$ 1,728.3		$ 1,677.1
Deferred Income Tax	347.2		347.2		44.7
Net Unrealized Gain on Securities Not Other-Than-Temporarily Impaired	892.2		892.2		614.8
Foreign Currency Translation Adjustment	(78.6)		(78.6)		(117.6)
Deferral of Acquisition Costs	(111.0)	(110.1)	(347.6)	(334.7)
Amortization of Deferred Acquisition Costs	87.0	84.3	285.6	273.9
Income Tax - Deferred	4.7	32.3	139.9	86.7
Net Income	230.2	202.0	660.5	653.2
Basic	$ 0.83	$ 0.68	$ 2.33	$ 2.14
Assuming Dilution	$ 0.83	$ 0.68	$ 2.32	$ 2.13
Change in Adjustment to Reserves for Future Policy and Contract Benefits, Net of Reinsurance and Other	(430.1)	(703.3)	(683.6)	(931.2)
Change in Foreign Currency Translation Adjustment	29.4	(33.8)	39.0	(6.0)
Change in Deferred Acquisition Costs			(62.0)	(60.8)
Change in Income Taxes			151.9	37.9
Retained Earnings (Accumulated Deficit)	7,173.4		7,173.4		6,611.0
Previous Accounting Guidance [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Deferred Acquisition Costs		2,572.4		2,572.4	2,300.9
Deferred Income Tax		795.3		795.3	261.2
Net Unrealized Gain on Securities Not Other-Than-Temporarily Impaired		885.6		885.6	605.8
Foreign Currency Translation Adjustment		(116.9)		(116.9)	(121.5)
Deferral of Acquisition Costs		(155.6)		(472.1)
Amortization of Deferred Acquisition Costs		125.2		400.4
Income Tax - Deferred		33.3		90.0
Net Income		205.6		660.8
Basic		$ 0.69		$ 2.16
Assuming Dilution		$ 0.69		$ 2.15
Change in Adjustment to Reserves for Future Policy and Contract Benefits, Net of Reinsurance and Other		(705.3)		(934.0)
Change in Foreign Currency Translation Adjustment		(34.1)		(6.0)
Change in Deferred Acquisition Costs				(71.7)
Change in Income Taxes				41.2
Retained Earnings (Accumulated Deficit)		7,487.3		7,487.3	7,031.2
Adjustments for New Accounting Pronouncement [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Deferred Acquisition Costs		1,860.6		1,860.6	1,677.1
Deferred Income Tax		547.8		547.8	44.7
Net Unrealized Gain on Securities Not Other-Than-Temporarily Impaired		894.0		894.0	614.8
Foreign Currency Translation Adjustment		(113.0)		(113.0)	(117.6)
Deferral of Acquisition Costs		(110.1)		(334.7)
Amortization of Deferred Acquisition Costs		84.3		273.9
Income Tax - Deferred		32.3		86.7
Net Income		202.0		653.2
Basic		$ 0.68		$ 2.14
Assuming Dilution		$ 0.68		$ 2.13
Change in Adjustment to Reserves for Future Policy and Contract Benefits, Net of Reinsurance and Other		(703.3)		(931.2)
Change in Foreign Currency Translation Adjustment		(33.8)		(6.0)
Change in Deferred Acquisition Costs				(60.8)
Change in Income Taxes				37.9
Retained Earnings (Accumulated Deficit)		7,010.7		7,010.7	6,611.0
Restatement Adjustment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Deferred Acquisition Costs		(711.8)		(711.8)	(623.8)
Deferred Income Tax		(247.5)		(247.5)	(216.5)
Net Unrealized Gain on Securities Not Other-Than-Temporarily Impaired		8.4		8.4	9.0
Foreign Currency Translation Adjustment		3.9		3.9	3.9
Deferral of Acquisition Costs		45.5		137.4
Amortization of Deferred Acquisition Costs		(40.9)		(126.5)
Income Tax - Deferred		(1.0)		(3.3)
Net Income		(3.6)		(7.6)
Basic		$ (0.01)		$ (0.02)
Assuming Dilution		$ (0.01)		$ (0.02)
Change in Adjustment to Reserves for Future Policy and Contract Benefits, Net of Reinsurance and Other		2.0		2.8
Change in Foreign Currency Translation Adjustment		0.3		0
Change in Deferred Acquisition Costs				10.9
Change in Income Taxes				(3.3)
Retained Earnings (Accumulated Deficit)		$ (476.6)		$ (476.6)	$ (420.2)

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Before-Tax Credit Related Portion of Other-Than-Temporary Impairments on Fixed Maturity Securities Still Held and Recognized in Other Comprehensive Income (Detail) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2011
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Balance at Beginning of Year	$ 8.5
Sales or Maturities of Securities in the Period	8.5
Balance at End of Year	$ 0

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Accounting Developments (Tables)

9 Months Ended

Sep. 30, 2012

New Accounting Pronouncements and Changes in Accounting Principles [Abstract]

Schedule of New Accounting Pronouncements and Changes in Accounting Principles [Table Text Block]

	Historical						Effect			Historical						Effect
	Accounting			As			of			Accounting			As			of
	Method			Adjusted			Change			Method			Adjusted			Change
	(in millions of dollars, except share data)
	Three Months Ended September 30, 2011									Nine Months Ended September 30, 2011
Consolidated Statements of Income
Deferral of Acquisition Costs	$	(155.6	)	$	(110.1	)	$	45.5		$	(472.1	)	$	(334.7	)	$	137.4
Amortization of Deferred Acquisition Costs	125.2			84.3			(40.9		)	400.4			273.9			(126.5		)
Income Tax - Deferred	33.3			32.3			(1.0		)	90.0			86.7			(3.3		)
Net Income	205.6			202.0			(3.6		)	660.8			653.2			(7.6		)
Net Income Per Common Share
Basic	0.69			0.68			(0.01		)	2.16			2.14			(0.02		)
Assuming Dilution	0.69			0.68			(0.01		)	2.15			2.13			(0.02		)
Consolidated Statements of Comprehensive Income
Net Income	$	205.6		$	202.0		$	(3.6	)	$	660.8		$	653.2		$	(7.6	)
Change in Adjustment to Reserves for Future Policy and Contract Benefits, Net of Reinsurance and Other	(705.3		)	(703.3		)	2.0			(934.0		)	(931.2		)	2.8
Change in Foreign Currency Translation Adjustment	(34.1		)	(33.8		)	0.3			(6.0		)	(6.0		)	—
Consolidated Statement of Cash Flows
Net Income										$	660.8		$	653.2		$	(7.6	)
Change in Deferred Acquisition Costs										(71.7		)	(60.8		)	10.9
Change in Income Taxes										41.2			37.9			(3.3		)
	December 31, 2011									September 30, 2011
Consolidated Balance Sheets
Deferred Acquisition Costs	$	2,300.9		$	1,677.1		$	(623.8	)	$	2,572.4		$	1,860.6		$	(711.8	)
Deferred Income Tax	261.2			44.7			(216.5		)	795.3			547.8			(247.5		)
Net Unrealized Gain on Securities Not Other-Than-Temporarily Impaired	605.8			614.8			9.0			885.6			894.0			8.4
Foreign Currency Translation Adjustment	(121.5		)	(117.6		)	3.9			(116.9		)	(113.0		)	3.9
Retained Earnings	7,031.2			6,611.0			(420.2		)	7,487.3			7,010.7			(476.6		)