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 March 31, 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

285,849,395 shares of the registrant's common stock were outstanding as of April 27, 2012.

TABLE OF CONTENTS

		Page
	Cautionary Statement Regarding Forward-Looking Statements	1
	PART I
1.	Financial Statements (Unaudited):
	Consolidated Balance Sheets at March 31, 2012 and December 31, 2011	2
	Consolidated Statements of Income for the three months ended March 31, 2012 and 2011	4
	Consolidated Statements of Comprehensive Income for the three months ended March 31, 2012 and 2011	5
	Consolidated Statements of Stockholders' Equity for the three months ended March 31, 2012 and 2011	6
	Consolidated Statements of Cash Flows for the three months ended March 31, 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	79
4.	Controls and Procedures	79
	PART II
1.	Legal Proceedings	80
1A.	Risk Factors	80
2.	Unregistered Sales of Equity Securities and Use of Proceeds	80
6.	Exhibits	81
	Signatures	82

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.

• 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

	March 31 2012		December 31 2011
	(in millions of dollars)
			As Adjusted
Assets
Investments
Fixed Maturity Securities - at fair value (amortized cost: $36,888.0; $36,640.7)	$	42,411.2	$	42,486.7
Mortgage Loans	1,615.9		1,612.3
Policy Loans	3,049.0		3,051.4
Other Long-term Investments	635.5		639.2
Short-term Investments	1,441.2		1,423.5
Total Investments	49,152.8		49,213.1
Other Assets
Cash and Bank Deposits	102.5		116.6
Accounts and Premiums Receivable	1,713.8		1,672.2
Reinsurance Recoverable	4,824.4		4,854.6
Accrued Investment Income	736.9		681.8
Deferred Acquisition Costs	1,699.7		1,677.1
Goodwill	201.5		201.2
Property and Equipment	497.4		493.3
Other Assets	642.8		645.3
Total Assets	$	59,571.8	$	59,555.2

See notes to consolidated financial statements.

2

CONSOLIDATED BALANCE SHEETS (UNAUDITED) - Continued

Unum Group and Subsidiaries

	March 31 2012			December 31 2011
	(in millions of dollars)
				As Adjusted
Liabilities and Stockholders' Equity
Liabilities
Policy and Contract Benefits	$	1,470.5		$	1,494.0
Reserves for Future Policy and Contract Benefits	42,965.5			43,051.9
Unearned Premiums	490.4			433.2
Other Policyholders' Funds	1,638.4			1,625.9
Income Tax Payable	98.4			38.2
Deferred Income Tax	88.9			44.7
Short-term Debt	372.2			312.3
Long-term Debt	2,552.8			2,570.2
Other Liabilities	1,714.8			1,815.1
Total Liabilities	51,391.9			51,385.5
Commitments and Contingent Liabilities - Note 9
Stockholders' Equity
Common Stock, $0.10 par
Authorized: 725,000,000 shares
Issued: 359,304,646 and 358,691,567 shares	35.9			35.9
Additional Paid-in Capital	2,600.4			2,591.1
Accumulated Other Comprehensive Income (Loss)
Net Unrealized Gain on Securities Not Other-Than-Temporarily Impaired	584.4			614.8
Net Gain on Cash Flow Hedges	398.0			408.7
Foreign Currency Translation Adjustment	(89.4		)	(117.6		)
Unrecognized Pension and Postretirement Benefit Costs	(437.6		)	(444.1		)
Retained Earnings	6,793.5			6,611.0
Treasury Stock - at cost: 73,492,245 and 65,975,613 shares	(1,705.3		)	(1,530.1		)
Total Stockholders' Equity	8,179.9			8,169.7
Total Liabilities and Stockholders' Equity	$	59,571.8		$	59,555.2

See notes to consolidated financial statements.

3

CONSOLIDATED STATEMENTS OF INCOME (UNAUDITED)

Unum Group and Subsidiaries

	Three Months Ended March 31
	2012			2011
	(in millions of dollars, except share data)
				As Adjusted
Revenue
Premium Income	$	1,921.9		$	1,869.5
Net Investment Income	619.5			618.7
Realized Investment Gain (Loss)
Other-Than-Temporary Impairment Loss on Fixed Maturity Securities	—			(2.3		)
Other Net Realized Investment Gain	12.4			17.5
Net Realized Investment Gain	12.4			15.2
Other Income	57.5			59.7
Total Revenue	2,611.3			2,563.1
Benefits and Expenses
Benefits and Change in Reserves for Future Benefits	1,662.9			1,593.0
Commissions	232.3			224.3
Interest and Debt Expense	35.5			37.9
Deferral of Acquisition Costs	(117.4		)	(112.2		)
Amortization of Deferred Acquisition Costs	99.4			95.0
Compensation Expense	206.9			201.9
Other Expenses	181.7			195.8
Total Benefits and Expenses	2,301.3			2,235.7
Income Before Income Tax	310.0			327.4
Income Tax
Current	37.3			65.3
Deferred	58.8			38.5
Total Income Tax	96.1			103.8
Net Income	$	213.9		$	223.6
Net Income Per Common Share
Basic	$	0.74		$	0.72
Assuming Dilution	$	0.73		$	0.71

See notes to consolidated financial statements.

4

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED)

Unum Group and Subsidiaries

	Three Months Ended March 31
	2012			2011
	(in millions of dollars)
				As Adjusted
Net Income	$	213.9		$	223.6
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 benefit of $110.2; $40.7)	(196.5		)	(77.3		)
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 benefit of $110.2; $41.8)	(196.5		)	(79.4		)
Reclassification Adjustment for Net Realized Investment Gain (net of tax expense of $0.3; $0.5)	(0.7		)	(0.6		)
Change in Net Gain on Cash Flow Hedges (net of tax benefit of $5.9; $5.4)	(10.7		)	(9.9		)
Change in Adjustment to Reserves for Future Policy and Contract Benefits, Net of Reinsurance and Other (net of tax expense of $97.2; $59.8)	166.8			113.2
Change in Foreign Currency Translation Adjustment	28.2			26.5
Change in Unrecognized Pension and Postretirement Benefit Costs (net of tax expense of $3.5; $1.6)	6.5			5.1
Total Other Comprehensive Income (Loss)	(6.4		)	54.9
Comprehensive Income	$	207.5		$	278.5

See notes to consolidated financial statements.

5

CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (UNAUDITED)

Unum Group and Subsidiaries

	Three Months Ended March 31
	2012			2011
	(in millions of dollars)
				As Adjusted
Common Stock
Balance at Beginning of Year	$	35.9		$	36.5
Common Stock Activity	—			0.1
Retirement of Repurchased Common Shares	—			(0.8		)
Balance at End of Period	35.9			35.8
Additional Paid-in Capital
Balance at Beginning of Year	2,591.1			2,615.4
Common Stock Activity	9.3			12.2
Retirement of Repurchased Common Shares	—			(55.2		)
Balance at End of Period	2,600.4			2,572.4
Accumulated Other Comprehensive Income (Loss)
Balance at Beginning of Year	461.8			351.4
Change During Period	(6.4		)	54.9
Balance at End of Period	455.4			406.3
Retained Earnings
Balance at Beginning of Year	6,611.0			6,591.8
Net Income	213.9			223.6
Dividends to Stockholders (per common share: $0.1050; $0.0925)	(31.4		)	(29.9		)
Retirement of Repurchased Common Shares	—			(144.0		)
Balance at End of Period	6,793.5			6,641.5
Treasury Stock
Balance at Beginning of Year	(1,530.1		)	(1,110.2		)
Purchases of Treasury Stock	(175.2		)	(23.6		)
Balance at End of Period	(1,705.3		)	(1,133.8		)
Total Stockholders' Equity at End of Period	$	8,179.9		$	8,522.2

See notes to consolidated financial statements.

6

CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED)

Unum Group and Subsidiaries

	Three Months Ended March 31
	2012			2011
	(in millions of dollars)
				As Adjusted
Cash Flows from Operating Activities
Net Income	$	213.9		$	223.6
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities
Change in Receivables	1.6			33.8
Change in Deferred Acquisition Costs	(18.0		)	(17.2		)
Change in Insurance Reserves and Liabilities	167.3			112.6
Change in Income Taxes	116.7			82.0
Change in Other Accrued Liabilities	(68.0		)	(32.1		)
Non-cash Adjustments to Net Investment Income	(100.9		)	(112.6		)
Net Realized Investment Gain	(12.4		)	(15.2		)
Depreciation	20.5			19.3
Other, Net	8.6			6.8
Net Cash Provided by Operating Activities	329.3			301.0
Cash Flows from Investing Activities
Proceeds from Sales of Fixed Maturity Securities	127.6			243.7
Proceeds from Maturities of Fixed Maturity Securities	596.3			400.5
Proceeds from Sales and Maturities of Other Investments	33.5			35.5
Purchase of Fixed Maturity Securities	(845.7		)	(898.6		)
Purchase of Other Investments	(52.6		)	(92.9		)
Net Sales (Purchases) of Short-term Investments	(17.2		)	524.4
Other, Net	(23.7		)	(24.6		)
Net Cash (Used) Provided by Investing Activities	(181.8		)	188.0
Cash Flows from Financing Activities
Net Short-term Debt Borrowings (Repayments)	59.9			(225.1		)
Long-term Debt Repayments	(17.5		)	(24.2		)
Issuance of Common Stock	0.9			5.5
Repurchase of Common Stock	(175.2		)	(215.7		)
Dividends Paid to Stockholders	(31.4		)	(29.9		)
Other, Net	1.7			3.4
Net Cash Used by Financing Activities	(161.6		)	(486.0		)
Net Increase (Decrease) in Cash and Bank Deposits	(14.1		)	3.0
Cash and Bank Deposits at Beginning of Year	116.6			53.6
Cash and Bank Deposits at End of Period	$	102.5		$	56.6

See notes to consolidated financial statements.

7

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED)

Unum Group and Subsidiaries

March 31, 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 March 31, 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

March 31, 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

March 31, 2012

Note 2 - Accounting Developments - Continued

	Historical
	Accounting			As			Effect of
	Method			Adjusted			Change
	(in millions of dollars, except share data)
At or for the Three Months Ended March 31, 2011
Consolidated Balance Sheets
Deferred Acquisition Costs	$	2,542.9		$	1,834.6		$	(708.3	)
Deferred Income Tax	471.2			224.5			(246.7		)
Net Unrealized Gain on Securities Not Other-Than-Temporarily Impaired	443.6			449.3			5.7
Foreign Currency Translation Adjustment	(84.1		)	(80.6		)	3.5
Retained Earnings	7,112.3			6,641.5			(470.8		)
Consolidated Statements of Income
Deferral of Acquisition Costs	$	(158.3	)	$	(112.2	)	$	46.1
Amortization of Deferred Acquisition Costs	138.3			95.0			(43.3		)
Income Tax - Deferred	39.5			38.5			(1.0		)
Net Income	225.4			223.6			(1.8		)
Net Income Per Common Share
Basic	0.72			0.72			—
Assuming Dilution	0.72			0.71			(0.01		)
Consolidated Statements of Comprehensive Income
Net Income	$	225.4		$	223.6		$	(1.8	)
Change in Adjustment to Reserves for Future Policy and Contract Benefits, Net of Reinsurance and Other	113.2			113.2			—
Change in Foreign Currency Translation Adjustment	26.8			26.5			(0.3		)
Consolidated Statements of Cash Flows
Net Income	$	225.4		$	223.6		$	(1.8	)
Change in Deferred Acquisition Costs	(20.0		)	(17.2		)	2.8
Change in Income Taxes	83.0			82.0			(1.0		)
December 31, 2011
Consolidated Balance Sheets
Deferred Acquisition Costs	$	2,300.9		$	1,677.1		$	(623.8	)
Deferred Income Tax	261.2			44.7			(216.5		)
Net Unrealized Gain on Securities Not Other-Than-Temporarily Impaired	605.8			614.8			9.0
Foreign Currency Translation Adjustment	(121.5		)	(117.6		)	3.9
Retained Earnings	7,031.2			6,611.0			(420.2		)

10

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

March 31, 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.

11

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

March 31, 2012

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.

	March 31, 2012				December 31, 2011
	Carrying Amount		Fair Value		Carrying Amount		Fair Value
	(in millions of dollars)
Assets
Fixed Maturity Securities	$	42,411.2	$	42,411.2	$	42,486.7	$	42,486.7
Mortgage Loans	1,615.9		1,792.1		1,612.3		1,789.8
Policy Loans	3,049.0		3,115.4		3,051.4		3,124.4
Other Long-term Investments
Derivatives	111.9		111.9		137.7		137.7
Equity Securities	12.6		12.6		11.2		11.2
Miscellaneous Long-term Investments	452.8		452.8		436.4		436.4
Liabilities
Policyholders' Funds
Deferred Annuity Products	$	641.1	$	641.1	$	641.1	$	641.1
Supplementary Contracts without Life Contingencies	508.7		508.7		502.6		502.6
Long-term Debt	2,552.8		2,585.8		2,570.2		2,540.2
Other Liabilities
Derivatives	174.3		174.3		173.7		173.7
Embedded Derivative in Modified Coinsurance Arrangement	123.4		123.4		135.7		135.7
Unfunded Commitments to Investment Partnerships	152.0		152.0		160.6		160.6

12

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

March 31, 2012

Note 3 - Fair Values of Financial Instruments - Continued

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.

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 $2,834.9 million and $2,838.3 million as of March 31, 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 $1,170.2 million at March 31, 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 $1,143.3 million at March 31, 2012 and are assigned a Level 2. Debt instruments which are valued using discounted cash flow analyses have a fair value of $2.3 million at March 31, 2012 and are assigned a Level 3.

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

13

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

March 31, 2012

Note 3 - Fair Values of Financial Instruments - Continued

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.

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

14

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

March 31, 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 March 31, 2012, approximately 14.7 percent of our fixed maturity securities were valued using active trades from TRACE pricing or broker market maker prices for which there was current market activity in that specific security (comparable to receiving one binding quote).  The prices obtained were not adjusted, and the assets were classified as Level 1, the 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.

15

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

March 31, 2012

Note 3 - Fair Values of Financial Instruments - Continued

The remaining 85.3 percent of our fixed maturity securities were valued based on non-binding quotes or other observable and unobservable inputs, as discussed below.

• Approximately 67.1 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 4.9 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 13.3 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.

16

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

March 31, 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:

	March 31, 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	$	118.7	$	1,130.9	$	—	$	1,249.6
States, Municipalities, and Political Subdivisions	32.4		1,457.6		66.4		1,556.4
Foreign Governments	—		1,411.8		—		1,411.8
Public Utilities	1,041.5		8,851.1		548.3		10,440.9
Mortgage/Asset-Backed Securities	—		2,821.0		21.3		2,842.3
All Other Corporate Bonds	5,033.9		19,098.7		733.2		24,865.8
Redeemable Preferred Stocks	—		14.1		30.3		44.4
Total Fixed Maturity Securities	6,226.5		34,785.2		1,399.5		42,411.2
Other Long-term Investments
Derivatives
Interest Rate Swaps	—		109.0		—		109.0
Foreign Exchange Contracts	—		2.9		—		2.9
Total Derivatives	—		111.9		—		111.9
Equity Securities	—		8.1		4.5		12.6
Liabilities
Other Liabilities
Derivatives
Interest Rate Swaps	$	—	$	31.2	$	—	$	31.2
Foreign Exchange Contracts	—		143.1		—		143.1
Embedded Derivative in Modified Coinsurance Arrangement	—		—		123.4		123.4
Total Derivatives	—		174.3		123.4		297.7

17

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

March 31, 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

18

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

March 31, 2012

Note 3 - Fair Values of Financial Instruments - Continued

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

	Three Months Ended March 31
	2012				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	$	—	$	204.2	$	16.1	$	—
States, Municipalities, and Political Subdivisions	—		43.8		25.4		274.9
Foreign Governments	—		—		—		0.7
Public Utilities	826.2		454.4		885.5		481.1
All Other Corporate Bonds	3,042.8		1,684.5		3,064.3		1,540.8
Total Fixed Maturity Securities	$	3,869.0	$	2,386.9	$	3,991.3	$	2,297.5

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.

19

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

March 31, 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 March 31, 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		$	—		$	(3.2	)	$	—	$	—		$	9.9	$	(8.4	)	$	66.4
Public Utilities	338.9			—			(0.1		)	—		(0.9		)	416.9		(206.5		)	548.3
Mortgage/Asset-Backed Securities	31.7			—			2.4			—		—			—		(12.8		)	21.3
All Other Corporate Bonds	665.5			—			7.0			12.0		(40.3		)	223.0		(134.0		)	733.2
Redeemable Preferred Stocks	37.2			(1.0		)	2.1			—		(14.3		)	6.3		—			30.3
Total Fixed Maturity Securities	1,141.4			(1.0		)	8.2			12.0		(55.5		)	656.1		(361.7		)	1,399.5
Equity Securities	11.2			—			—			—		—			—		(6.7		)	4.5
Embedded Derivative in Modified Coinsurance Arrangement	(135.7		)	12.3			—			—		—			—		—			(123.4		)
	Three Months Ended March 31, 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		$	—		$	(0.7	)	$	7.0	$	(0.3	)	$	249.7	$	(104.6	)	$	324.7
Mortgage/Asset-Backed Securities	0.7			—			(1.6		)	—		(2.2		)	35.3		—			32.2
All Other Corporate Bonds	829.7			(0.2		)	0.5			16.7		(3.3		)	153.1		(362.7		)	633.8
Redeemable Preferred Stocks	21.7			—			—			—		—			—		(21.6		)	0.1
Total Fixed Maturity Securities	1,025.7			(0.2		)	(1.8		)	23.7		(5.8		)	438.1		(488.9		)	990.8
Equity Securities	1.5			—			—			—		—			—		—			1.5
Embedded Derivative in Modified Coinsurance Arrangement	(96.3		)	14.1			—			—		—			—		—			(82.2		)

20

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

March 31, 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 for the three months ended March 31, 2012 and 2011 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 $12.3 million and $14.1 million, respectively. 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.

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

	March 31, 2012
	(in millions of dollars)
	Fair Value			Unobservable Input		Range/Weighted Average
Fixed Maturity Securities
States, Municipalities, and Political Subdivisions - Private	$	66.4		- Comparability Adjustment - Discount for Size - Volatility of Credit	(b) (c) (e)	0.50% - 1.25%/0.87% 0.20% - 0.20%/0.20% 0.25% - 0.25%/0.25%
Mortgage/Asset-Backed Securities - Private	0.6			- Discount for Size	(c)	4.99% - 5.08%/5.06%
All Other Corporate Bonds - Private	295.6			- Change in Benchmark Reference - Comparability Adjustment - Discount for Size - Lack of Marketability - Volatility of Credit - Market Convention	(a) (b) (c) (d) (e) (f)	1.65% - 1.65%/1.65% 0.03% - 0.75%/0.50% 0.50% - 0.50%/0.50% 0.50% - 1.00%/0.74% (0.50)% - 7.72%/1.27% Priced at Par
All Other Corporate Bonds - Public	117.5			- Change in Benchmark Reference - Comparability Adjustment - Discount for Size	(a) (b) (c)	0.25% - 0.47%/0.27% 0.25% - 0.50%/0.41% 0.25% - 0.25%/0.25%
Equity Securities - Private	4.0			- Market Convention	(f)	Priced at Cost or Owner's Equity
Embedded Derivative in Modified Coinsurance Arrangement	(123.4		)	- 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 illiquidity

(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

March 31, 2012

Note 4 - Investments

Fixed Maturity Securities

At March 31, 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.

	March 31, 2012
	(in millions of dollars)
	Amortized Cost		Gross Unrealized Gain		Gross Unrealized Loss		Fair Value
United States Government and Government Agencies and Authorities	$	997.1	$	254.5	$	2.0	$	1,249.6
States, Municipalities, and Political Subdivisions	1,341.1		226.5		11.2		1,556.4
Foreign Governments	1,185.3		226.5		—		1,411.8
Public Utilities	9,026.0		1,451.0		36.1		10,440.9
Mortgage/Asset-Backed Securities	2,504.4		338.8		0.9		2,842.3
All Other Corporate Bonds	21,793.6		3,178.8		106.6		24,865.8
Redeemable Preferred Stocks	40.5		4.5		0.6		44.4
Total Fixed Maturity Securities	$	36,888.0	$	5,680.6	$	157.4	$	42,411.2

	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 March 31, 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

March 31, 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.

	March 31, 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	$	8.9	$	0.2	$	5.6	$	1.8
States, Municipalities, and Political Subdivisions	68.7		3.8		74.8		7.4
Public Utilities	229.4		19.0		128.9		17.1
Mortgage/Asset-Backed Securities	38.6		0.3		9.0		0.6
All Other Corporate Bonds	1,253.4		39.9		590.1		66.7
Redeemable Preferred Stocks	—		—		6.9		0.6
Total Fixed Maturity Securities	$	1,599.0	$	63.2	$	815.3	$	94.2

	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.

	March 31, 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	$	617.5	$	17.3	$	629.8	$	—	$	5.0
Over 1 year through 5 years	5,281.0		496.2		5,428.0		6.2		343.0
Over 5 years through 10 years	9,659.8		1,315.4		10,269.9		34.5		670.8
Over 10 years	18,825.3		3,512.9		20,874.5		115.8		1,347.9
	34,383.6		5,341.8		37,202.2		156.5		2,366.7
Mortgage/Asset-Backed Securities	2,504.4		338.8		2,794.7		0.9		47.6
Total Fixed Maturity Securities	$	36,888.0	$	5,680.6	$	39,996.9	$	157.4	$	2,414.3

23

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

March 31, 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 March 31, 2012, the fair value of investment-grade fixed maturity securities was $39,474.5 million, with a gross unrealized gain of $5,533.2 million and a gross unrealized loss of $88.0 million. The gross unrealized loss on investment-grade fixed maturity securities was 55.9 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 March 31, 2012, the fair value of below-investment-grade fixed maturity securities was $2,936.7 million, with a gross unrealized gain of $147.4 million and a gross unrealized loss of $69.4 million. The gross unrealized loss on below-investment-grade fixed maturity securities was 44.1 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 March 31, 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 March 31, 2012, we held 88 individual investment-grade fixed maturity securities and 45 individual below-investment-grade fixed maturity securities that were in an unrealized loss position, of which 30 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

March 31, 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

March 31, 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. We held no fixed maturity securities as of the beginning of 2012 or at the end of the first quarter of 2012 for which a portion of an other-than-temporary impairment was previously recognized in other comprehensive income.

	Three Months Ended
	March 31, 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 March 31, 2012, we had non-binding commitments of $81.0 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 March 31, 2012, the carrying amount of our variable interest entity investments that are not consolidated under the provisions of GAAP was $444.2 million, comprised of $339.2 million of tax credit partnerships and $105.0 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 $152.0 million at March 31, 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 $84.9 million to fund certain private equity partnerships at March 31, 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 $125.0 million, $0.1 million, and $8.6 million, respectively, as of March 31, 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 March 31, 2012, we had no commitments to fund the underlying partnerships, nor did we fund any amounts to the partnerships during the three months ended March 31, 2012 and 2011.

26

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

March 31, 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:

	March 31, 2012				December 31, 2011
	Carrying		Percent of		Carrying		Percent of
	Amount		Total		Amount		Total
	(in millions of dollars)
Property Type
Apartment	$	27.8	1.7	%	$	28.0	1.8	%
Industrial	504.5		31.2		502.0		31.1
Mixed	93.0		5.8		93.5		5.8
Office	663.8		41.1		659.3		40.9
Retail	319.8		19.8		322.4		20.0
Other	7.0		0.4		7.1		0.4
Total	$	1,615.9	100.0	%	$	1,612.3	100.0	%

Region
New England	$	145.8	9.0	%	$	147.0	9.1	%
Mid-Atlantic	172.5		10.7		174.1		10.8
East North Central	211.3		13.1		212.7		13.2
West North Central	149.9		9.3		151.2		9.4
South Atlantic	397.5		24.6		383.8		23.8
East South Central	52.1		3.2		52.4		3.3
West South Central	158.8		9.8		160.4		9.9
Mountain	69.0		4.3		69.5		4.3
Pacific	259.0		16.0		261.2		16.2
Total	$	1,615.9	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

March 31, 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:

	March 31		December 31
	2012		2011
	(in millions of dollars)
Internal Rating
Aa	$	13.9	$	10.9
A	690.7		712.6
Baa	878.1		855.0
Ba	20.1		20.7
B	13.1		13.1
Total	$	1,615.9	$	1,612.3

Loan-to-Value Ratio
<= 65%	$	614.7	$	578.4
> 65% <= 75%	778.3		802.3
> 75% <= 85%	171.6		165.1
> 85% <= 100%	51.3		66.5
Total	$	1,615.9	$	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 March 31
	2012		2011
	(in millions of dollars)
Balance at Beginning of Year	$	1.5	$	1.5
Provision	0.5		—
Balance at End of Period	$	2.0	$	1.5

28

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

March 31, 2012

Note 4 - Investments - Continued

Impaired mortgage loans are as follows:

	March 31, 2012
	(in millions of dollars)
			Unpaid
	Recorded		Principal		Related
	Investment		Balance		Allowance
With an Allowance Recorded	$	22.0	$	24.0	$	2.0
	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

For the three months ended March 31, 2012 and 2011, our average investment in impaired mortgage loans was $23.7 million and $13.1 million, respectively. For the three months ended March 31, 2012 and 2011, we recognized $0.2 million and $0.3 million of interest income, respectively, on mortgage loans subsequent to impairment.

Our troubled debt restructurings during the three months ended March 31, 2012 and 2011 were comprised entirely of loan foreclosures. A summary of our troubled debt restructurings is as follows:

	Three Months Ended March 31
	2012		2011
	(in millions of dollars)
Foreclosure
Carrying Amount	$	4.2	$	9.8
Number of Loans	1		1

We had no realized losses on loan foreclosures for the three months ended March 31, 2012 and 2011.

As of March 31, 2012 and December 31, 2011, we held one mortgage loan that was past due regarding principal and interest payments and for which we had discontinued the accrual of investment income. This loan was greater than 90 days past due as of March 31, 2012 and December 31, 2011 and had a carrying value of $8.9 million and $9.4 million, respectively.

At March 31, 2012, we had non-binding commitments of $29.9 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.

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.

29

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

March 31, 2012

Note 4 - Investments - Continued

We account for all of our securities lending agreements and repurchase agreements as collateralized financings. As of March 31, 2012, the carrying amount of fixed maturity securities loaned to third parties under our securities lending program was $374.1 million, for which we received collateral in the form of cash and securities of $372.2 million and $16.4 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 March 31, 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 March 31
	2012			2011
	(in millions of dollars)
Fixed Maturity Securities
Gross Gains on Sales	$	5.9		$	9.5
Gross Losses on Sales	(5.0		)	(6.9		)
Other-Than-Temporary Impairment Loss	—			(2.3		)
Mortgage Loans and Other Invested Assets
Gross Gains on Sales	—			1.2
Impairment Loss	(0.5		)	—
Embedded Derivative in Modified Coinsurance Arrangement	12.3			14.1
Foreign Currency Transactions	(0.3		)	(0.4		)
Net Realized Investment Gain	$	12.4		$	15.2

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.

• 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.

30

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

March 31, 2012

Note 5 - Derivative Financial Instruments - Continued

• 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 use 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 $8.7 million at March 31, 2012. We held cash collateral of $42.6 million and $45.6 million from our counterparties as of March 31, 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 $135.1 million and $114.9 million at March 31, 2012 and December 31, 2011, respectively. We had no cash posted as collateral to our counterparties at March 31, 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 $174.3 million and $173.7 million at March 31, 2012 and December 31, 2011, respectively.

31

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

March 31, 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 December 31, 2010	$	174.0	$	617.9	$	890.0	$	—	$	1,681.9
Additions	—		—		—		19.9		19.9
Terminations	—		11.0		55.0		19.9		85.9
Balance at March 31, 2011	$	174.0	$	606.9	$	835.0	$	—	$	1,615.9
Balance at December 31, 2011	$	174.0	$	554.0	$	685.0	$	—	$	1,413.0
Additions	—		—		—		35.0		35.0
Terminations	—		3.9		45.0		35.0		83.9
Balance at March 31, 2012	$	174.0	$	550.1	$	640.0	$	—	$	1,364.1

The following table summarizes the timing of anticipated settlements of interest rate swaps outstanding under our cash flow hedging programs at March 31, 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	$	140.0		$	150.0		$	290.0
Weighted Average Receive Rate	6.49		%	6.34		%	6.41		%
Weighted Average Pay Rate	0.47		%	0.47		%	0.47		%

Cash Flow Hedges

As of March 31, 2012 and December 31, 2011, we had $290.0 million and $335.0 million, respectively, notional amount of forward starting interest rate swaps to hedge the anticipated purchase of fixed maturity securities.

As of March 31, 2012 and December 31, 2011, we had $550.1 million and $554.0 million, respectively, notional amount of open current and forward foreign currency swaps to hedge fixed income foreign currency-denominated securities.

During the three months ended March 31, 2012, we entered into and subsequently terminated $35.0 million notional amount of forward treasury locks used to minimize interest rate risk associated with the anticipated disposal of certain fixed maturity securities. These treasury locks were terminated at the time the securities were called, and we recognized a loss of $0.1 million on the termination of these hedges. The loss was recognized in other comprehensive income and subsequently amortized into net investment income.

During the three months ended March 31, 2011, we entered into and subsequently terminated $19.9 million notional amount of forward treasury locks used to minimize interest rate risk associated with the anticipated disposal of certain fixed maturity securities. These treasury locks were terminated at the time the securities were called and/or sold, and we recognized a gain of $0.1 million on the termination of these hedges. The gain was recognized in other comprehensive income and subsequently amortized into net investment income.

For the three months ended March 31, 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 March 31, 2012, we expect to amortize approximately $36.2 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

32

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

March 31, 2012

Note 5 - Derivative Financial Instruments - Continued

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 March 31, 2012. Fluctuations in fair values of these derivatives between March 31, 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 March 31, 2012, we are hedging the variability of future cash flows associated with forecasted transactions through the year 2038.

Fair Value Hedges

As of March 31, 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.  For the three months ended March 31, 2012 and 2011, the change in fair value of the hedged fixed maturity securities attributable to the hedged benchmark interest rate resulted in losses of $1.7 million and $2.6 million, respectively, with offsetting gains on the related interest rate swaps.

As of March 31, 2012 and 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. This swap effectively converts 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. For the three months ended March 31, 2012, the change in fair value of the hedged fixed debt attributable to the hedged benchmark interest rate resulted in a de minimis loss, with an offsetting de minimis gain on the related interest rate swaps. For the three months ended March 31, 2011, the change in fair value of the hedged fixed debt attributable to the hedged benchmark interest rate resulted in a gain of $2.1 million, with an offsetting loss on the related interest rate swaps.

For the three months ended March 31, 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.

33

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

March 31, 2012

Note 5 - Derivative Financial Instruments - Continued

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.

	March 31, 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	Other L-T Investments	$	109.0	Other Liabilities	$	31.2
Foreign Exchange Contracts	Other L-T Investments	2.9		Other Liabilities	143.1
Total		$	111.9		$	174.3
Not Designated as Hedging Instruments
Embedded Derivative in Modified Coinsurance Arrangement				Other Liabilities	$	123.4

	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 March 31, 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	$	18.3		$	9.1		(1)
Interest Rate Swaps	—			0.1			(2)
Interest Rate Swaps	—			(0.4		)	(3)
Foreign Exchange Contracts	—			(0.2		)	(1)
Foreign Exchange Contracts	(2.9		)	(12.4		)	(2)
Total	$	15.4		$	(3.8	)

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

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

(3) Loss recognized in interest and debt expense

34

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

March 31, 2012

Note 5 - Derivative Financial Instruments - Continued

	Three Months Ended March 31, 2011
	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	$	14.6		$	8.4		(1)
Interest Rate Swaps	—			1.2			(2)
Interest Rate Swaps	—			(0.4		)	(3)
Foreign Exchange Contracts	—			(0.3		)	(1)
Foreign Exchange Contracts	(7.9		)	(18.5		)	(2)
Total	$	6.7		$	(9.6	)

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

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

(3) Loss recognized in interest and debt expense

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

	Three Months Ended March 31
	2012		2011
	(in millions of dollars)
Gain Recognized in Net Realized Investment Gain	$	12.3	$	14.1

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. A long-term focus is necessary to maintain profitability over the life of the business, although we may experience realized investment losses which will affect future earnings levels 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

35

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

March 31, 2012

Note 6 - Segment Information - Continued

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 March 31
	2012			2011
	(in millions of dollars)
Operating Revenue by Segment	$	2,598.9		$	2,547.9
Net Realized Investment Gain	12.4			15.2
Revenue	$	2,611.3		$	2,563.1
Operating Income by Segment	$	309.2		$	320.2
Net Realized Investment Gain	12.4			15.2
Non-operating Retirement-related Loss	(11.6		)	(8.0		)
Income Tax	(96.1		)	(103.8		)
Net Income	$	213.9		$	223.6

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.

36

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

March 31, 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 March 31
	2012		2011
	(in millions of dollars)
Unum US
Group Disability
Group Long-term Disability	$	395.5	$	397.0
Group Short-term Disability	117.7		111.0
Group Life and Accidental Death & Dismemberment
Group Life	293.6		273.4
Accidental Death & Dismemberment	28.3		27.1
Supplemental and Voluntary
Individual Disability - Recently Issued	118.4		115.1
Voluntary Benefits	158.5		145.2
	1,112.0		1,068.8
Unum UK
Group Long-term Disability	101.9		103.4
Group Life	52.7		47.6
Supplemental and Voluntary	16.1		16.1
	170.7		167.1
Colonial Life
Accident, Sickness, and Disability	180.2		172.3
Life	51.7		46.2
Cancer and Critical Illness	64.4		61.9
	296.3		280.4
Closed Block
Individual Disability	187.2		202.3
Long-term Care	155.2		150.6
All Other	0.5		0.3
	342.9		353.2
Total	$	1,921.9	$	1,869.5

37

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

March 31, 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 March 31, 2012
Premium Income	$	1,112.0	$	170.7	$	296.3	$	342.9	$	—		$	1,921.9
Net Investment Income	238.6		36.5		35.6		301.6		7.2			619.5
Other Income	31.1		0.1		0.1		25.9		0.3			57.5
Operating Revenue	$	1,381.7	$	207.3	$	332.0	$	670.4	$	7.5		$	2,598.9
Operating Income (Loss)	$	205.9	$	38.8	$	69.7	$	15.4	$	(20.6	)	$	309.2
Three Months Ended March 31, 2011
Premium Income	$	1,068.8	$	167.1	$	280.4	$	353.2	$	—		$	1,869.5
Net Investment Income	233.7		44.9		31.3		294.3		14.5			618.7
Other Income	31.0		0.1		0.1		27.5		1.0			59.7
Operating Revenue	$	1,333.5	$	212.1	$	311.8	$	675.0	$	15.5		$	2,547.9
Operating Income (Loss)	$	194.7	$	48.9	$	66.5	$	31.9	$	(21.8	)	$	320.2

Assets by segment are as follows:

	March 31		December 31
	2012		2011
	(in millions of dollars)
Unum US	$	18,621.5	$	18,583.6
Unum UK	3,746.8		3,549.5
Colonial Life	3,209.3		3,167.8
Closed Block	31,306.2		31,439.5
Corporate	2,688.0		2,814.8
Total	$	59,571.8	$	59,555.2

38

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

March 31, 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 March 31
	Pension Benefits
	U.S. Plans						Non U.S. Plans						OPEB
	2012			2011			2012			2011			2012			2011
	(in millions of dollars)
Service Cost	$	12.2		$	10.6		$	1.2		$	1.2		$	0.4		$	0.5
Interest Cost	21.1			19.4			2.1			2.2			2.4			2.5
Expected Return on Plan Assets	(22.2		)	(21.9		)	(2.7		)	(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		$	16.0		$	0.7		$	0.3		$	2.0		$	2.2

We have no regulatory contribution requirements for our U.S. qualified defined benefit plan in 2012. For our U.K. operation, which maintains a separate defined benefit plan, we made required contributions of $1.1 million, or approximately £0.7 million, during the three months ended March 31, 2012.

39

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

March 31, 2012

Note 8 - Stockholders' Equity and Earnings Per Common Share

Net income per common share is determined as follows:

	Three Months Ended March 31
	2012		2011
	(in millions of dollars, except share data)
Numerator
Net Income	$	213.9	$	223.6
Denominator (000s)
Weighted Average Common Shares - Basic	290,429.5		312,742.3
Dilution for Assumed Exercises of Stock Options and Nonvested Stock Awards	854.5		1,590.0
Weighted Average Common Shares - Assuming Dilution	291,284.0		314,332.3
Net Income Per Common Share
Basic	$	0.74	$	0.72
Assuming Dilution	$	0.73	$	0.71

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 $11.37 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 2.2 million and 1.9 million shares of common stock for the three month periods ended March 31, 2012 and 2011, respectively.

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 has an expiration date of 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.

40

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

March 31, 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 months ended March 31, 2012, we repurchased an additional 7.5 million shares on the open market at a cost of $175.2 million, including commissions of $0.2 million. The dollar value of shares remaining under the $1.0 billion repurchase program was $349.7 million at March 31, 2012. 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.

41

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

March 31, 2012

Note 9 - Commitments and Contingent Liabilities - Continued

Broker Compensation and Quoting Process

We and certain of our subsidiaries, along with many other insurance brokers and insurers, were named as defendants in a series of putative class actions that were transferred to the U.S. District Court for the District ofNew Jersey for coordinated or consolidated pretrial proceedings as part of multidistrict litigation (MDL) No. 1663, In re Insurance Brokerage Antitrust Litigation. The plaintiffs in MDL No. 1663 were ordered to file a consolidated amended complaint which alleged, among other things, that the defendants violated federal and state antitrust laws, the Racketeer Influenced Corrupt Organizations Act (RICO), Employee Retirement Income Security Act (ERISA), and various state common law requirements by engaging in alleged bid rigging and customer allocation and by paying undisclosed compensation to insurance brokers to steer business to defendant insurers. After several amendments to the complaint, all claims against us were dismissed, and the dismissal was affirmed on appeal by the United States Court of Appeals for the Third Circuit.

The only remaining proceeding against us that is part of MDL No. 1663 is Palm Tree Computers Systems, Inc. v. ACE USA, et al., which was filed in the Florida state Circuit Court on February 16, 2005. The complaint contains allegations similar to those referred to above. The case was removed to federal court and, on October 20, 2005, the case was transferred to MDL No. 1663. Plaintiffs renewed a motion to remand the case to the state court in Florida, and that motion was denied without prejudice on October 16, 2009. There have been no further proceedings in this case subsequent to that date, while the Court considers motions to dismiss filed by other defendants in MDL No. 1663.

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. This decision has been appealed to the United States District Court for the Southern District of New York.

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.

42

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

March 31, 2012

Note 9 - Commitments and Contingent Liabilities - Continued

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.

In 2009, a Pennsylvania-based insurance company and its affiliates were ordered into rehabilitation, and the Pennsylvania Insurance Commissioner, who was appointed as the Rehabilitator, filed petitions for liquidation with the Commonwealth Court of Pennsylvania. Under Pennsylvania legislation, payment of covered claims and other related insurance obligations are provided, within prescribed limits, by state guaranty funds. These guaranty funds assess fees on insurance companies that sell insurance within the state, which are generally based on a company's pro rata portion of premiums written or received prior to the insolvency. Under Pennsylvania statutes, an insurer is declared insolvent only after it is placed under an order of liquidation by a court of competent jurisdiction with a finding for insolvency. If and when the formal order of liquidation is issued, we would then be subject to an assessment and would record a contingent liability net of any recoverable premium tax offsets. We do not believe our exposure to potential assessment is material to our consolidated financial position or results of operations.

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.

43

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

March 31, 2012

Note 10 - Other

Debt

At March 31, 2012, short-term debt consisted of $372.2 million of securities lending transactions. Regarding activity relative to our long-term debt, during the three months ended March 31, 2012, we made principal payments of $15.0 million and $2.5 million on our senior secured non-recourse floating rate notes issued by Northwind Holdings, LLC and Tailwind Holdings, LLC, respectively.

Income Tax

At March 31, 2012, we had a liability of $82.5 million for unrecognized tax benefits, all of which is associated with deferred tax assets. The interest expense and penalties related to unrecognized tax expense in our consolidated statements of income was $0.5 million and $1.2 million for the three months ended March 31, 2012 and 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, it is reasonably possible that this appeal will be resolved in whole or in part within 12 months and that statutes of limitations may expire in multiple jurisdictions within the same period.  As a result, it is reasonably possible that our liability for unrecognized tax benefits could decrease within 12 months by $0 million to $66.0 million.  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.

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 March 31, 2012, and the related consolidated statements of income, comprehensive income, stockholders' equity, and cash flows for the three-month periods ended March 31, 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

May 2, 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 with Unum Group 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 something unexpected occur, a need that has been made even more apparent following the recent financial crisis.  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 potentially catastrophic fallout of 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

During 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 first quarter of 2012, we reported net income of $213.9 million, or $0.73 per diluted common share, compared to net income of $223.6 million, or $0.71 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 $213.2 million, or $0.73 per diluted common share, in the first quarter of 2012 compared to $219.1 million, or $0.70 per diluted common share, in the same period of 2011. Our first quarter of 2012 net income per share and after-tax operating income per share, as compared to the same period in 2011, was aided by the repurchase of our common stock throughout 2011 and during the first quarter of 2012. Total operating revenue by segment during the first quarter of 2012 was higher than the comparable period of 2011, with increases in both premium income and net investment income. Total operating income by segment decreased in the first quarter of 2012 relative to the first quarter of 2011, with lower earnings in the Unum UK and Closed Block segments partially offset by higher earnings in Unum US and Colonial Life. 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 an increase in segment operating income of 5.8 percent in the first quarter of 2012 compared to the same period of 2011, with higher operating revenue and continued favorable expense management. Although Unum US premium income increased 4.0 percent in the first quarter of 2012 compared to the same period of 2011, the ongoing high levels of unemployment and the competitive environment continue to pressure our premium income growth. 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 relative to the first quarter of 2011. The benefit ratio for our Unum US segment for the first quarter of 2012 was 72.5 percent compared to 72.1 percent in the same period of 2011, with less favorable risk results for the group disability and group life and accidental death and dismemberment product lines partially offset by favorable risk results for the supplemental and voluntary product line. Unum US sales increased 12.1 percent in the first quarter of 2012 compared to the same period of 2011, with sales increases in nearly all 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 a sales increase of 11.5 percent in the first quarter of 2012 compared to the same period of 2011. Group large case sales increased 9.4 percent, and voluntary benefits sales increased 15.7 percent in the first quarter of 2012 compared to the same period of 2011. Premium persistency was above the levels of the first quarter of 2011 for all products except short-term disability and remains high relative to historical levels.

Our Unum UK segment reported a decrease in segment operating income of 18.8 percent in the first quarter of 2012, as measured in Unum UK's local currency, relative to the same period of 2011. The decrease was driven primarily by less favorable risk results. Premium income grew 4.2 percent in the first quarter of 2012 compared to the same period of 2011, although premium growth continues to be pressured by pricing actions resulting from the competitive U.K. market. The benefit ratio for Unum UK was 72.4 percent in the first quarter of 2012 compared to 69.3 percent in the same period of 2011, with less favorable risk experience for all product lines. Unum UK sales increased 78.2 percent in the first quarter of 2012 compared to the same period of 2011, as measured in Unum UK's local currency, driven by higher group life and group long-term disability sales, led by a few large case sales in the group life market. Persistency in the first quarter of 2012 was higher than the first quarter of 2011 for group long-term disability, but was lower than the first quarter of 2011 for group life and supplemental and voluntary.

47

Our Colonial Life segment reported operating income growth of 4.8 percent in the first quarter of 2012 compared to the same period of 2011, driven by higher operating revenue and continued favorable expense management. Premium income grew 5.7 percent in the first quarter of 2012 compared to the same period of 2011. The benefit ratio for Colonial Life was 52.1 percent in the first quarter of 2012 compared to 51.4 percent in the same period of 2011, with increases in all product lines. Colonial Life sales increased 0.7 percent in the first quarter of 2012 compared to the same period of 2011. Commercial market sales in first quarter of 2012 were consistent with the same period of 2011, with a 1.1 percent increase in the core commercial market segment, which we define as accounts with fewer than 1,000 lives, mostly offset by an 8.5 percent decrease in the large case commercial market segment. Sales were 3.2 percent higher in the public sector market in first quarter of 2012 compared to the same period of 2011. Persistency in the first quarter of 2012 was below the level of the same period of 2011 but remains strong.

Our investment portfolio continues to perform well, with a slight growth in net investment income in the first quarter of 2012 compared to the same period of 2011. The net unrealized gain on our fixed maturity securities was $5.5 billion at March 31, 2012, compared to $5.8 billion at December 31, 2011.

We believe our capital and financial positions are strong. At March 31, 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 406 percent, compared to 405 percent at December 31, 2011. Our leverage ratio, when calculated using consolidated debt to total consolidated capital, was 28.9 percent at March 31, 2012, compared to 28.7 percent at December 31, 2011. The slight increase was due to the increase in short-term debt related to securities lending agreements outstanding at March 31, 2012, partially offset by our first quarter 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 23.4 percent at March 31, 2012, compared to 23.5 percent at December 31, 2011. The cash and marketable securities at our holding companies equaled approximately $575 million at March 31, 2012, compared to $756 million at December 31, 2011, reflecting our first quarter of 2012 repurchase of 7.5 million of our common shares on the open market at a cost of $175.2 million.

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

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 three 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.

48

Consolidated Operating Results

(in millions of dollars)
	Three Months Ended March 31
	2012			% Change		2011
Revenue
Premium Income	$	1,921.9		2.8	%	$	1,869.5
Net Investment Income	619.5			0.1		618.7
Net Realized Investment Gain	12.4			(18.4	)	15.2
Other Income	57.5			(3.7	)	59.7
Total Revenue	2,611.3			1.9		2,563.1
Benefits and Expenses
Benefits and Change in Reserves for Future Benefits	1,662.9			4.4		1,593.0
Commissions	232.3			3.6		224.3
Interest and Debt Expense	35.5			(6.3	)	37.9
Deferral of Acquisition Costs	(117.4		)	4.6		(112.2		)
Amortization of Deferred Acquisition Costs	99.4			4.6		95.0
Compensation Expense	206.9			2.5		201.9
Other Expenses	181.7			(7.2	)	195.8
Total Benefits and Expenses	2,301.3			2.9		2,235.7
Income Before Income Tax	310.0			(5.3	)	327.4
Income Tax	96.1			(7.4	)	103.8
Net Income	$	213.9		(4.3	)	$	223.6

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 1.571 and 1.607, for the three months ended March 31, 2012 and 2011, respectively. If the first quarter of 2012 results for our U.K. operations had been translated at the higher exchange rate of the first quarter of 2011, our operating revenue and operating income by segment in the first quarter of 2012 would have been higher by approximately $4.6 million and $0.8 million, respectively. 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 first quarter of 2012 compared to the same period of 2011 includes premium growth for each of our three major business segments. For our closed block segment, in total, premium income declined as expected, although our long-term care closed line of business experienced premium growth relative to the first quarter of 2011 due to premium persistency and group long-term care sales which occurred during 2011 and the first quarter of 2012.

Net investment income was slightly higher in the first quarter of 2012 relative to the same period of 2011 due primarily to continued growth in the level of invested assets and an increase in income from bond call premiums and private equity partnerships, mostly offset by 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 in benefits as well as an increase in the amortization of the principal amount invested in our tax-credit partnerships.

We recognized in earnings net realized investment gains of $12.4 million and $15.2 million in the first quarter of 2012 and 2011, respectively. Included in the net realized investment gain for the first quarter of 2011 was an other-than-temporary impairment loss on fixed maturity securities of $2.3 million, all of which was 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 $12.3 million and $14.1 million in the first quarter of 2012 and 2011, respectively. Gains and losses on this embedded derivative result primarily from changes in credit spreads in the overall investment market.

49

The benefit ratio was 86.5 percent in the first quarter of 2012 compared to 85.2 percent in the same period of 2011, with unfavorable year over year risk results in each of our segments. Further discussion of our line of business risk results and claims management performance for each of our segments is included in "Segment Results" as follows.

Interest and debt expense in the first quarter 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 and continuing principal payments on Tailwind Holdings and Northwind Holdings debt, partially offset by a higher rate of interest on $350.0 million of debt which we converted into floating rate debt through the use of an interest rate swap.

The deferral of acquisition costs increased in the first quarter of 2012 compared to the same period of 2011, with continued growth in certain of our product lines and the associated increase in deferrable expenses more than offsetting the lower level of deferrable costs in product lines with lower growth.

The amortization of acquisition costs in the first quarter of 2012 was higher than the same period of 2011 due primarily to higher amortization in our Unum US supplemental and voluntary product line driven by unfavorable premium persistency relative to assumptions for certain issue years within certain of our product lines. Amortization in Colonial Life was also higher in the first quarter of 2012 compared to the prior year due to continued growth in the level of the deferred asset.

Other expenses were lower in the first quarter of 2012 compared to the same period of 2011 due to our continued focus on operating effectiveness and expense management.

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. A long-term focus is necessary to maintain profitability over the life of the business, although we may experience realized investment losses which will affect future earnings levels 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 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. 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. We may at other times exclude certain other items from our discussion of financial ratios and metrics in order to enhance the understanding and comparability of our operational performance and the underlying fundamentals, but this exclusion is not an indication that similar items may not recur and does not replace net income or net loss as a measure of our overall profitability. 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.

50

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 March 31
	2012			2011
Operating Revenue by Segment	$	2,598.9		$	2,547.9
Net Realized Investment Gain	12.4			15.2
Revenue	$	2,611.3		$	2,563.1
Operating Income by Segment	$	309.2		$	320.2
Net Realized Investment Gain	12.4			15.2
Non-operating Retirement-related Loss	(11.6		)	(8.0		)
Income Tax	(96.1		)	(103.8		)
Net Income	$	213.9		$	223.6

	Three Months Ended March 31
	2012						2011
	(in millions)			per share *			(in millions)			per share *
After-tax Operating Income	$	213.2		$	0.73		$	219.1		$	0.70
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	12.4			0.04			15.2			0.05
Income Tax on Net Realized Investment Gain	(4.1		)	(0.01		)	(5.5		)	(0.02		)
Net Income	$	213.9		$	0.73		$	223.6		$	0.71

* Assuming Dilution

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Consolidated Sales Results

(in millions of dollars)
	Three Months Ended March 31
	2012		% Change		2011
Unum US
Fully Insured Products	$	194.9	12.7	%	$	173.0
Administrative Services Only (ASO) Products	0.6		(57.1	)	1.4
Total Unum US	195.5		12.1		174.4
Unum UK	30.8		75.0		17.6
Colonial Life	71.1		0.7		70.6
Closed Block	9.1		28.2		7.1
Consolidated	$	306.5	13.6		$	269.7

Sales results shown in the preceding chart generally represent the annualized premium or annualized fee income on new sales which we expect to receive and report as premium income or fee 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 or fee 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 or fee income over a 12 month period, while premium income and fee income reported in our financial statements are reported on an "as earned" basis rather than an annualized basis and also include renewals and persistency of in-force policies written in prior years as well as current new sales.

Premiums for fully insured products are reported as premium income. Fees for ASO and family medical leave products are included in other income. Sales, persistency of the existing block of business, and the effectiveness of a renewal program are indicators of growth in premium and fee 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 March 31
	2012			% Change		2011
Operating Revenue
Premium Income	$	1,112.0		4.0	%	$	1,068.8
Net Investment Income	238.6			2.1		233.7
Other Income	31.1			0.3		31.0
Total	1,381.7			3.6		1,333.5
Benefits and Expenses
Benefits and Change in Reserves for Future Benefits	806.2			4.6		770.4
Commissions	129.3			5.1		123.0
Interest and Debt Expense	0.3			—		0.3
Deferral of Acquisition Costs	(61.9		)	9.4		(56.6		)
Amortization of Deferred Acquisition Costs	53.6			8.1		49.6
Other Expenses	248.3			(1.5	)	252.1
Total	1,175.8			3.2		1,138.8
Operating Income Before Income Tax and Net Realized Investment Gains and Losses	$	205.9		5.8		$	194.7
Operating Ratios (% of Premium Income):
Benefit Ratio	72.5		%			72.1		%
Other Expense Ratio	22.3		%			23.6		%
Before-tax Operating Income Ratio	18.5		%			18.2		%

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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 March 31
	2012			% Change		2011
Operating Revenue
Premium Income
Group Long-term Disability	$	395.5		(0.4	)%	$	397.0
Group Short-term Disability	117.7			6.0		111.0
Total Premium Income	513.2			1.0		508.0
Net Investment Income	147.4			(0.2	)	147.7
Other Income	23.5			5.9		22.2
Total	684.1			0.9		677.9
Benefits and Expenses
Benefits and Change in Reserves for Future Benefits	435.7			2.2		426.3
Commissions	40.4			(1.0	)	40.8
Interest and Debt Expense	0.3			—		0.3
Deferral of Acquisition Costs	(6.1		)	13.0		(5.4		)
Amortization of Deferred Acquisition Costs	4.2			(16.0	)	5.0
Other Expenses	134.9			(1.6	)	137.1
Total	609.4			0.9		604.1
Operating Income Before Income Tax and Net Realized Investment Gains and Losses	$	74.7		1.2		$	73.8
Operating Ratios (% of Premium Income):
Benefit Ratio	84.9		%			83.9		%
Other Expense Ratio	26.3		%			27.0		%
Before-tax Operating Income Ratio	14.6		%			14.5		%
Premium Persistency:
Group Long-term Disability	91.7		%			89.7		%
Group Short-term Disability	90.5		%			90.7		%
Case Persistency:
Group Long-term Disability	87.8		%			89.2		%
Group Short-term Disability	86.6		%			87.7		%

Group disability premium income increased slightly in the first quarter of 2012 compared to the same period of 2011 driven primarily by prior period sales growth in group short-term disability as well as continued strong persistency in both long-term and short-term disability. Net investment income was slightly lower in the first quarter of 2012 compared to the same period of 2011 due to a decrease in the level of assets supporting this line of business, partially offset by an increase in the level of prepayment income on mortgage-backed securities and an increase in bond call premiums. Other income includes ASO fees of $14.7 million and $14.5 million, and fees from fee-based family medical leave products of $5.9 million and $4.9 million, in the first quarters of 2012 and 2011, respectively.

The benefit ratio was higher in the first quarter of 2012 compared to the same period of 2011 due to unfavorable risk results in group short-term disability resulting from increases in claim incidence rates and average weekly indemnities. Group long-term disability risk results were slightly favorable in the first quarter of 2012 due to higher claim recoveries, offset partially by an increase in submitted claim incidence relative to the first quarter of 2011.

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

54

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 March 31
	2012			% Change		2011
Operating Revenue
Premium Income
Group Life	$	293.6		7.4	%	$	273.4
Accidental Death & Dismemberment	28.3			4.4		27.1
Total Premium Income	321.9			7.1		300.5
Net Investment Income	34.9			2.0		34.2
Other Income	0.5			—		0.5
Total	357.3			6.6		335.2
Benefits and Expenses
Benefits and Change in Reserves for Future Benefits	231.7			10.2		210.2
Commissions	26.2			11.5		23.5
Deferral of Acquisition Costs	(5.1		)	8.5		(4.7		)
Amortization of Deferred Acquisition Costs	3.4			(5.6	)	3.6
Other Expenses	48.7			(4.5	)	51.0
Total	304.9			7.5		283.6
Operating Income Before Income Tax and Net Realized Investment Gains and Losses	$	52.4		1.6		$	51.6
Operating Ratios (% of Premium Income):
Benefit Ratio	72.0		%			70.0		%
Other Expense Ratio	15.1		%			17.0		%
Before-tax Operating Income Ratio	16.3		%			17.2		%
Premium Persistency:
Group Life	91.3		%			86.4		%
Accidental Death & Dismemberment	91.0		%			86.1		%
Case Persistency:
Group Life	87.3		%			88.3		%
Accidental Death & Dismemberment	87.4		%			88.5		%

Premium income for group life and accidental death and dismemberment was higher in the first quarter of 2012 compared to the same period of 2011 due primarily to higher sales and premium persistency. Case persistency in the first quarter of 2012 was slightly lower than the same period of 2011. Net investment income was higher in the first quarter of 2012 compared to the same period of 2011 due primarily to an increase in bond call premiums and an increase in the level of prepayment income on mortgage-backed securities.

The benefit ratio was higher in the first quarter of 2012 compared to the same period of 2011 due to a higher incidence rate for group life. Commissions and the deferral of acquisition costs were higher in the first quarter of 2012 compared to the same period of 2011 due primarily to the higher level of sales. The amortization of acquisition costs was slightly lower in the first quarter of 2012 than in the same period of 2011 due primarily to a decrease in amortization related to internal replacement transactions. The other expense ratio was lower in the first quarter of 2012 relative to the same period of 2011 due primarily to higher premium income and our continued focus on operating effectiveness and expense management.

55

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 March 31
	2012			% Change		2011
Operating Revenue
Premium Income
Individual Disability - Recently Issued	$	118.4		2.9	%	$	115.1
Voluntary Benefits	158.5			9.2		145.2
Total Premium Income	276.9			6.4		260.3
Net Investment Income	56.3			8.7		51.8
Other Income	7.1			(14.5	)	8.3
Total	340.3			6.2		320.4
Benefits and Expenses
Benefits and Change in Reserves for Future Benefits	138.8			3.7		133.9
Commissions	62.7			6.8		58.7
Deferral of Acquisition Costs	(50.7		)	9.0		(46.5		)
Amortization of Deferred Acquisition Costs	46.0			12.2		41.0
Other Expenses	64.7			1.1		64.0
Total	261.5			4.1		251.1
Operating Income Before Income Tax and Net Realized Investment Gains and Losses	$	78.8		13.7		$	69.3
Operating Ratios (% of Premium Income):
Benefit Ratios:
Individual Disability - Recently Issued	51.6		%			52.2		%
Voluntary Benefits	49.0		%			50.8		%
Other Expense Ratio	23.4		%			24.6		%
Before-tax Operating Income Ratio	28.5		%			26.6		%
Interest Adjusted Loss Ratio:
Individual Disability - Recently Issued	30.3		%			30.9		%
Premium Persistency:
Individual Disability - Recently Issued	90.3		%			89.8		%
Voluntary Benefits	79.9		%			79.5		%

Premium income was higher in the first quarter of 2012 compared to the same period of 2011 due primarily to growth in our voluntary benefits product line. Premium persistency for both the individual disability - recently issued and voluntary benefits product lines increased. Net investment income was higher in the first quarter of 2012 compared to the same period of 2011 due primarily to an increase in the level of assets supporting these lines of business, an increase in the level of prepayment income on mortgage-backed securities, and an increase in bond call premiums.

The interest adjusted loss ratio for the individual disability - recently issued line of business was lower in the first quarter of 2012 compared to the same period of 2011 due to a lower paid claim incidence rate and a higher rate of claim recoveries. The benefit ratio for voluntary benefits was lower in the first quarter of 2012 compared to the same period of 2011 due primarily to a lower paid claim incidence rate for voluntary life, partially offset by a higher paid claim incidence rate for voluntary disability.

Commissions and the deferral of acquisition costs were higher in the first quarter of 2012 compared to the same period of 2011 due to higher sales. The amortization of deferred acquisition costs was higher in the first quarter of 2012 compared to the same period of 2011 due to unfavorable premium persistency relative to assumptions for certain issue years within certain of our product lines.The other expense ratio was lower in the first quarter of 2012 relative to the same period of 2011 due primarily to higher premium income and our continued focus on operating effectiveness and expense management.

56

Unum US Sales

(in millions of dollars)
	Three Months Ended March 31
	2012		% Change		2011
Sales by Product
Fully Insured Products
Group Disability, Group Life, and AD&D
Group Long-term Disability	$	35.8	21.4	%	$	29.5
Group Short-term Disability	13.4		(4.3	)	14.0
Group Life	33.0		7.1		30.8
AD&D	2.9		16.0		2.5
Subtotal	85.1		10.8		76.8
Supplemental and Voluntary
Individual Disability - Recently Issued	14.9		4.9		14.2
Voluntary Benefits	94.9		15.7		82.0
Subtotal	109.8		14.1		96.2
Total Fully Insured Products	194.9		12.7		173.0
ASO Products	0.6		(57.1	)	1.4
Total Sales	$	195.5	12.1		$	174.4
Sales by Market Sector
Group Disability, Group Life, and AD&D
Core Market (< 2,000 lives)	$	58.4	11.5	%	$	52.4
Large Case Market	26.7		9.4		24.4
Subtotal	85.1		10.8		76.8
Supplemental and Voluntary	109.8		14.1		96.2
Total Fully Insured Products	194.9		12.7		173.0
ASO Products	0.6		(57.1	)	1.4
Total Sales	$	195.5	12.1		$	174.4

Unum US sales increased in the first quarter of 2012 compared to the same period of 2011, with growth in each of our major market segments and fully insured product lines, other than group short-term disability. Sales in our group core market segment were 11.5 percent higher in the first quarter of 2012 compared to the same period of 2011, with increases in each of the product lines within this market segment. The number of new accounts added in our group core market segment during 2012 was 6.3 percent higher than the number of new accounts added during the same period of 2011.

Sales in our group large case market segment were 9.4 percent higher in the first quarter of 2012 compared to the same period of 2011 due to higher group long-term disability sales, partially offset by lower group short-term disability and group life and accidental death and dismemberment sales. Our sales mix of group products in the first quarter of 2012 was approximately 69 percent core market and 31 percent large case market.

Sales of voluntary benefits were 15.7 percent higher in the first quarter of 2012 compared to the same period of 2011, with higher sales from both new and existing customers, particularly in the large case market. The number of new accounts added in the voluntary benefits product line was 1.7 percent lower in the first quarter of 2012 than the number of new accounts added during the same period of 2011.

Sales in our individual disability - recently issued line of business, which are primarily concentrated in the multi-life market, were 4.9 percent higher in the first quarter of 2012 compared to the same period of 2011. The increase was primarily due toincreased sales to existing customers in the small and mid-size segments.

57

We believe that the group core market and voluntary benefits market, which combined together are approximately 78 percent of our Unum US sales for the first quarter of 2012 and grew approximately 14.1 percent relative to the first quarter 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 quarter 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, 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. We are uncertain as to whether the higher levels of claim incidence experienced in the first quarter of 2012 and during 2011 were due to the normal volatility that occurs in our group disability business or were related to the economy. We began initiating price increases for our group disability products during the first quarter 2012 as a result of the higher levels of claim incidence and the continued low interest rate environment. 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. 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.

58

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 March 31
	2012			% Change		2011
Operating Revenue
Premium Income
Group Long-term Disability	$	101.9		(1.5	)%	$	103.4
Group Life	52.7			10.7		47.6
Supplemental and Voluntary	16.1			—		16.1
Total Premium Income	170.7			2.2		167.1
Net Investment Income	36.5			(18.7	)	44.9
Other Income	0.1			—		0.1
Total	207.3			(2.3	)	212.1
Benefits and Expenses
Benefits and Change in Reserves for Future Benefits	123.6			6.7		115.8
Commissions	10.6			(2.8	)	10.9
Deferral of Acquisition Costs	(3.6		)	2.9		(3.5		)
Amortization of Deferred Acquisition Costs	3.9			2.6		3.8
Other Expenses	34.0			(6.1	)	36.2
Total	168.5			3.2		163.2
Operating Income	$	38.8		(20.7	)	$	48.9
Operating Ratios (% of Premium Income):
Benefit Ratio	72.4		%			69.3		%
Other Expense Ratio	19.9		%			21.7		%
Before-tax Operating Income Ratio	22.7		%			29.3		%
Premium Persistency:
Group Long-term Disability	86.0		%			83.5		%
Group Life	84.7		%			85.7		%
Supplemental and Voluntary	86.7		%			89.3		%

59

Foreign Currency Translation

The functional currency of Unum UK is the British pound sterling. Unum UK's premiums, 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.

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 first quarter of 2012 compared to the same period of 2011, translating into dollars decreases current period results relative to the prior periods.

(in millions of pounds, except ratios)
	Three Months Ended March 31
	2012			% Change		2011
Operating Revenue
Premium Income
Group Long-term Disability	£	64.8		0.5	%	£	64.5
Group Life	33.5			12.8		29.7
Supplemental and Voluntary	10.3			3.0		10.0
Total Premium Income	108.6			4.2		104.2
Net Investment Income	23.3			(16.8	)	28.0
Other Income	—			(100.0	)	0.1
Total	131.9			(0.3	)	132.3
Benefits and Expenses
Benefits and Change in Reserves for Future Benefits	78.6			8.7		72.3
Commissions	6.7			(1.5	)	6.8
Deferral of Acquisition Costs	(2.3		)	4.5		(2.2		)
Amortization of Deferred Acquisition Costs	2.5			4.2		2.4
Other Expenses	21.7			(4.0	)	22.6
Total	107.2			5.2		101.9
Operating Income	£	24.7		(18.8	)	£	30.4
Weighted Average Pound/Dollar Exchange Rate	1.571					1.607

Premium income was higher the first quarter of 2012 compared to the same period of 2011, although premium growth continues to be pressured by pricing actions resulting from the competitive U.K. market. Group life premium income was higher in the first quarter of 2012 compared to the same period of 2011 due to the increase in the inforce block of business resulting from 2011 sales. Group long-term disability and supplemental and voluntary premium income were generally consistent with the prior year first quarter. Net investment income was lower in first quarter of 2012 compared to the same period of 2011 due primarily to lower income on index-linked bonds and lower income from bond call premiums, partially offset by an increase in the level of assets supporting this line of business. These index-linked bonds support the claim reserves associated with certain of our group policies that provide for inflation-linked increases in benefits.

The benefit ratio was higher in the first quarter of 2012 compared to the same period of 2011 due primarily to unfavorable risk experience in group life, which was driven by a higher average claim size and higher claim volumes. The group long-term disability benefit ratio was slightly unfavorable in the first quarter of 2012 compared to the same period of 2011 driven by a lower average size of claims declined.

Commissions and the deferral and amortization of acquisition costs were generally consistent in the first quarter of 2012 compared to the same period of 2011. Other expenses were slightly lower than the prior year first quarter due to expense management initiatives, and the other expense ratio benefited from higher premium income.

60

Sales

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

(in millions)
	Three Months Ended March 31
	2012		% Change		2011
Group Long-term Disability	$	11.2	36.6	%	$	8.2
Group Life	18.0		164.7		6.8
Supplemental and Voluntary	1.6		(38.5	)	2.6
Total Sales	$	30.8	75.0		$	17.6
Group Long-term Disability	£	7.1	39.2	%	£	5.1
Group Life	11.5		167.4		4.3
Supplemental and Voluntary	1.0		(37.5	)	1.6
Total Sales	£	19.6	78.2		£	11.0

Sales in Unum UK's group long-term disability and group life product lines were higher in the first quarter of 2012 compared to the same period 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. Group life sales for the first quarter of 2012 increased due to four large cases with more than 2,000 employees as well as strong core sales throughout the quarter. Sales to existing customers were marginally higher in the first quarter of 2012 compared to the same period of 2011. We do not expect sales to continue at the elevated level of our first quarter of 2012 for our group life product line.

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 economic and competitive conditions in the U.K. 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 price increases for our group disability and group life products throughout 2012 to mitigate the impact of the current economic conditions. 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.

Our current growth strategy focuses on generating organic growth and expanding our role as the leading provider of group disability insurance in the U.K. Our strategy for future growth combines optimizing the performance of our existing business while developing new market opportunities. We intend to optimize performance of the existing business by (i) increasing underwriting and pricing discipline, (ii) improving our claims management processes, and (iii) expanding our broker market capabilities and sales effectiveness. We intend to develop new market opportunities by raising awareness of the need for income protection, including seeking to increase coverage of currently insured groups to include a greater percentage of the workforce, and by offering a suite of employer and employee paid workplace solutions using integrated products with simpler, defined choices and flexible funding options through a streamlined and efficient platform with online capabilities matched to broker and employer needs.

In the current competitive pricing market and economic environment, we continue to have a cautious outlook for premium growth. We anticipate returning to more normalized levels of premium growth through stable persistency and price increases, as well as increased sales to existing and new customers which we expect to occur commensurate with the timing of the U.K. economic recovery. Although our benefit ratio for the first quarter of 2012 was unfavorable compared to the first quarter of 2011, we expect our benefit ratio for the full year of 2012 to stabilize and be generally consistent with 2011. We also expect our profit margins for the full year 2012 to continue at a favorable level, consistent with 2011, despite the decline in profit margin in the first quarter of 2012.

61

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 March 31
	2012			% Change		2011
Operating Revenue
Premium Income
Accident, Sickness, and Disability	$	180.2		4.6	%	$	172.3
Life	51.7			11.9		46.2
Cancer and Critical Illness	64.4			4.0		61.9
Total Premium Income	296.3			5.7		280.4
Net Investment Income	35.6			13.7		31.3
Other Income	0.1			—		0.1
Total	332.0			6.5		311.8
Benefits and Expenses
Benefits and Change in Reserves for Future Benefits	154.4			7.1		144.1
Commissions	63.9			4.4		61.2
Deferral of Acquisition Costs	(51.9		)	1.2		(51.3		)
Amortization of Deferred Acquisition Costs	41.9			10.0		38.1
Other Expenses	54.0			1.5		53.2
Total	262.3			6.9		245.3
Operating Income Before Income Tax and Net Realized Investment Gains and Losses	$	69.7		4.8		$	66.5
Operating Ratios (% of Premium Income):
Benefit Ratio	52.1		%			51.4		%
Other Expense Ratio	18.2		%			19.0		%
Before-tax Operating Income Ratio	23.5		%			23.7		%
Persistency:
Accident, Sickness, and Disability	74.1		%			75.9		%
Life	84.9		%			86.0		%
Cancer and Critical Illness	83.6		%			84.9		%

Premium income was higher in the first quarter of 2012 compared to the same period of 2011 due primarily to prior period sales growth and stable persistency, although the premium growth rate continues to be negatively impacted by economic conditions that we believe affect the buying patterns of employees. Net investment income was higher in first quarter of 2012 compared to the same period of 2011 due primarily to growth in the level of assets supporting this line of business, higher bond call premiums, and an increase in income from private equity partnership investments.

The benefit ratio was higher in first quarter of 2012 compared to the same period of 2011 for all of our product lines. The benefit ratio in the accident, sickness, and disability line of business increased slightly due to a higher level of incurred claims.  The increase in the life benefit ratio was driven by unfavorable mortality rates in our traditional product line which can exhibit volatility from period to period. The cancer and critical illness benefit ratio increased slightly due to several large cancer claims and higher wellness benefit utilization during the first quarter of 2012.

Commissions and the deferral of acquisition costs were both higher in first quarter of 2012 compared to the same period of 2011 due primarily to an increase in costs related to growth in new business premium. The amortization of deferred acquisition costs continues to increase as the level of the deferred asset grows. The other expense ratio was lower in first quarter of 2012 compared to the same period of 2011 due primarily to higher premium income and a continued focus on expense management.

62

Sales

(in millions of dollars)
	Three Months Ended March 31
	2012		% Change		2011
Accident, Sickness, and Disability	$	46.5	(1.5	)%	$	47.2
Life	13.8		3.8		13.3
Cancer and Critical Illness	10.8		6.9		10.1
Total Sales	$	71.1	0.7		$	70.6

Colonial Life's sales were slightly higher in first quarter of 2012 compared to the same period of 2011, with an 8.9 percent increase in existing account sales mostly offset by a 14.7 percent decrease in new account sales. Commercial market sales in first quarter of 2012 were consistent with the same period of 2011, with a 1.1 percent increase in the core commercial market segment, which we define as accounts with fewer than 1,000 lives, mostly offset by an 8.5 percent decrease in the large case commercial market segment. Sales were 3.2 percent higher in the public sector market in first quarter of 2012 compared to the same period of 2011. The number of new accounts increased 3.0 percent in first quarter of 2012 compared to the same period of 2011, while the average new case size was 17.2 percent lower.

Segment Outlook

Our premium growth in first quarter of 2012 was in line with the level of growth in the same period of 2011 but was below the level of our long-term growth expectations. We believe slower sales and premium growth levels may continue in the near term if the current economic conditions persist and continue to affect employment growth and the buying patterns of employees. 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 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.

During the remainder of 2012, we expect premium growth to be modest relative to our long-term outlook. We believe that strong profit margins will continue, and we expect our overall benefit ratio to be generally consistent with the level of 2011. We believe further premium growth will re-emerge as the economy improves, employment growth accelerates, and our growth strategies gain momentum.

63

Closed Block Segment

The Closed Block segment consists of our closed individual disability and 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 March 31
	2012			% Change		2011
Operating Revenue
Premium Income
Individual Disability	$	187.2		(7.5	)%	$	202.3
Long-term Care	155.2			3.1		150.6
All Other	0.5			66.7		0.3
Total Premium Income	342.9			(2.9	)	353.2
Net Investment Income	301.6			2.5		294.3
Other Income	25.9			(5.8	)	27.5
Total	670.4			(0.7	)	675.0
Benefits and Expenses
Benefits and Change in Reserves for Future Benefits	578.7			2.8		562.7
Commissions	28.5			(2.4	)	29.2
Interest and Debt Expense	2.7			—		2.7
Deferral of Acquisition Costs	—			(100.0	)	(0.8		)
Amortization of Deferred Acquisition Costs	—			(100.0	)	3.5
Other Expenses	45.1			(1.5	)	45.8
Total	655.0			1.9		643.1
Operating Income Before Income Tax and Net Realized Investment Gains and Losses	$	15.4		(51.7	)	$	31.9
Interest Adjusted Loss Ratios:
Individual Disability	83.1		%			84.7		%
Long-term Care	91.2		%			83.0		%
Operating Ratios (% of Premium Income):
Other Expense Ratio	13.2		%			13.0		%
Before-tax Operating Income Ratio	4.5		%			9.0		%
Premium Persistency:
Individual Disability	92.9		%			92.8		%
Long-term Care	95.9		%			95.6		%

Individual Disability

The decrease in premium income in the first quarter of 2012 compared to the same period 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 first quarter of 2012 compared to the same period of 2011 due to a lower level of assets supporting this closed line of business, partially offset by higher bond call premiums and an increase in the level of prepayment income on mortgage-backed securities.

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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, decreased slightly in the first quarter of 2012 compared to the same period of 2011 due to lower investment income in the portfolios held by the ceding companies.

Risk results were favorable relative to the first quarter of 2011 due primarily to higher claim recoveries, partially offset by higher claim incidence rates.

Interest and debt expense in the first quarter of 2012 was consistent with the same period 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.

Long-term Care

The increase in premium income for the first quarter of 2012 compared to the same period of 2011 was driven by strong premium persistency and higher sales of group long-term care, which increased $2.0 million in the first quarter of 2012 compared to the same period of 2011. 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. We expect a limited amount of new sales to also occur in the second quarter of 2012. Net investment income was higher in the first quarter of 2012 compared to the same period of 2011 due primarily to an increase in the level of assets supporting this line of business, higher bond call premiums, and an increase in the level of prepayment income on mortgage-backed securities.

Risk results in the first quarter of 2012 were unfavorable compared with the same period of 2011 due to higher claim incidence. We had no amortization of deferred acquisition costs due to the impairment charge recognized at December 31, 2011.

In late 2010, we began a process of filing requests with various state insurance departments for a rate increase on certain of our individual long-term care policies. The rate increase reflects 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. Higher premium income associated with the rate increase is expected to begin to emerge during the remaining quarters of 2012.

All Other

Operating income for our other insurance products decreased in the first quarter of 2012 compared to the same period of 2011 due to lower net investment income, which was driven by a lower level of assets supporting these closed lines of business, and lower other income.

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 higher 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 sold on existing group policies. Profitability of our long-tailed products is affected by claims experience related to mortality 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. 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. We previously allocated the amortization of prior period actuarial gains or losses, a component of the net periodic benefit costs for our pensions and other postretirement benefit plans, to our Corporate segment. These actuarial gains or losses are primarily driven by market performance and are not indicative of the operational results of our businesses. 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.

Operating Results

(in millions of dollars)
	Three Months Ended March 31
	2012			% Change		2011
Operating Revenue
Net Investment Income	$	7.2		(50.3	)%	$	14.5
Other Income	0.3			(70.0	)	1.0
Total	7.5			(51.6	)	15.5
Expenses
Interest and Debt Expense	32.5			(6.9	)	34.9
Other Expenses	(4.4		)	N.M.		2.4
Total	28.1			(24.7	)	37.3
Operating Loss Before Non-operating Retirement-related Loss, Income Tax, and Net Realized Investment Gains and Losses	$	(20.6	)	5.5		$	(21.8	)
N.M. = not a meaningful percentage

Net investment income was lower in the first quarter of 2012 compared to the same period of 2011 due to lower asset levels, a lower proportion of assets invested at long-term interest rates, and an increase in the amortization of the principal amount invested in our 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 decreased in the first quarter of 2012 compared to 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 a higher rate of interest on $350.0 million of senior notes which we converted into floating rate debt through the use of an interest rate swap. Other expenses decreased in the first quarter of 2012 compared to the same period of 2011 due primarily to decreases in expense accruals.

Segment Outlook

We expect the quality of our investment portfolio to remain strong in 2012. 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 throughout 2012, 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 effective asset cash flows and durations with related expected liability cash flows and durations to consistently meet the liability funding requirements of our businesses. We seek to earn investment income while assuming credit risk in a prudent and selective manner, subject to constraints of quality, liquidity, diversification, and regulatory considerations. Our overall investment philosophy is to invest in a portfolio of high quality assets that provide investment returns consistent with that assumed in the pricing of our insurance products. Assets are invested predominately in fixed maturity securities. 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 asset-backed, mortgage-backed securities, or public bond portfolios. We have no direct exposure to sovereign debt of certain countries in the European Union, specifically Greece, Ireland, Italy, Portugal, and Spain. At March 31, 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 March 31, 2012, we held $299.9 million fair value ($305.9 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 was slightly higher in the first quarter of 2012 relative to the same period of 2011 due primarily to continued growth in the level of invested assets and an increase in income from bond call premiums and private equity partnerships, mostly offset by 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 in benefits as well as an increase in the amortization of the principal amount invested in our tax-credit partnerships.

The duration weighted book yield on the fixed income securities in our investment portfolio was 6.62 percent as of March 31, 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 limiting 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 March 31
	2012			2011
Fixed Maturity Securities
Gross Gains on Sales	$	5.9		$	9.5
Gross Losses on Sales	(5.0		)	(6.9		)
Other-Than-Temporary Impairment Loss	—			(2.3		)
Mortgage Loans and Other Invested Assets
Gross Gains on Sales	—			1.2
Impairment Loss	(0.5		)	—
Foreign Currency Transactions	(0.3		)	(0.4		)
Embedded Derivative in Modified Coinsurance Arrangement	12.3			14.1
Net Realized Investment Gain	$	12.4		$	15.2

We had no individual realized investment losses of $10.0 million or greater from other-than-temporary impairments or from the sale of fixed-maturity securities during the first quarter 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 during the first quarter 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 $(123.4) million at March 31, 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 March 31, 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	$	2,386.5	$	213.9	$	254.1	$	20.7	$	2,132.4	$	234.6
Capital Goods	3,732.8		421.4		364.3		23.6		3,368.5		445.0
Communications	2,823.9		404.3		144.0		14.3		2,679.9		418.6
Consumer Cyclical	1,168.6		131.9		156.0		5.8		1,012.6		137.7
Consumer Non-Cyclical	5,381.7		794.4		175.5		7.2		5,206.2		801.6
Energy (Oil & Gas)	3,699.6		586.8		129.5		2.6		3,570.1		589.4
Financial Institutions	3,514.4		204.1		559.4		30.4		2,955.0		234.5
Mortgage/Asset-Backed	2,842.3		337.9		47.6		0.9		2,794.7		338.8
Sovereigns	1,411.8		226.5		—		—		1,411.8		226.5
Technology	876.6		120.4		32.6		1.4		844.0		121.8
Transportation	1,281.7		195.0		28.1		0.6		1,253.6		195.6
U.S. Government Agencies and Municipalities	2,806.0		467.8		158.0		13.2		2,648.0		481.0
Utilities	10,440.9		1,414.9		358.3		36.1		10,082.6		1,451.0
Redeemable Preferred Stocks	44.4		3.9		6.9		0.6		37.5		4.5
Total	$	42,411.2	$	5,523.2	$	2,414.3	$	157.4	$	39,996.9	$	5,680.6

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 March 31, 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 March 31, 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
	March 31		December 31		September 30		June 30		March 31
Fair Value < 100% >= 70% of Amortized Cost
<= 90 days	$	15.6	$	12.8	$	38.9	$	16.7	$	14.8
> 90 <= 180 days	7.1		34.3		14.1		2.9		82.4
> 180 <= 270 days	9.6		8.0		—		39.7		14.5
> 270 days <= 1 year	2.2		—		24.6		14.8		1.6
> 1 year <= 2 years	19.3		33.7		11.4		2.6		1.5
> 2 years <= 3 years	0.2		1.1		1.8		2.4		9.6
> 3 years	34.0		40.9		28.1		42.2		37.2
Sub-total	88.0		130.8		118.9		121.3		161.6
Fair Value < 70% >= 40% of Amortized Cost
> 2 years <= 3 years	—		—		—		3.3		3.4
> 3 years	—		9.5		27.1		11.1		11.9
Sub-total	—		9.5		27.1		14.4		15.3
Total	$	88.0	$	140.3	$	146.0	$	135.7	$	176.9

Unrealized Loss on Below-Investment-Grade Fixed Maturity Securities

Length of Time in Unrealized Loss Position

(in millions of dollars)
	2012		2011
	March 31		December 31		September 30		June 30		March 31
Fair Value < 100% >= 70% of Amortized Cost
<= 90 days	$	4.8	$	3.3	$	39.5	$	3.9	$	5.2
> 90 <= 180 days	9.5		11.9		15.6		0.7		4.0
> 180 <= 270 days	7.9		8.5		1.6		4.6		0.1
> 270 days <= 1 year	6.5		0.7		6.7		0.1		3.1
> 1 year <= 2 years	15.7		13.0		13.7		3.5		—
> 2 years <= 3 years	—		—		0.3		5.3		5.1
> 3 years	24.6		37.3		35.2		18.0		23.3
Sub-total	69.0		74.7		112.6		36.1		40.8
Fair Value < 70% >= 40% of Amortized Cost
> 180 <= 270 days	—		—		0.7		—		—
> 1 year <= 2 years	—		5.0		—		—		—
> 3 years	0.4		2.2		10.3		0.4		0.4
Sub-total	0.4		7.2		11.0		0.4		0.4
Total	$	69.4	$	81.9	$	123.6	$	36.5	$	41.2

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The following table shows our fixed maturity securities with a gross unrealized loss of $10.0 million or greater, by industry type. We held no securities at March 31, 2012 with a gross unrealized loss of $20.0 million or greater.

Gross Unrealized Losses $10 Million or Greater on Fixed Maturity Securities

As of March 31, 2012

(in millions of dollars)
Classification	Fair Value		Gross Unrealized Loss		Number of Issuers
Investment-Grade
Financial Institutions	$	79.2	$	10.4	1

At March 31, 2012, our mortgage/asset-backed securities had an average life of 4.09 years, effective duration of 3.64 years, and a weighted average credit rating of AAA. 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. All of our mortgage-backed securities have fixed rate coupons. 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 March 31, 2012, the amortized cost and fair value of our below-investment-grade fixed maturity securities was $2,858.7 million and $2,936.7 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 denominated in 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. Our exposure relates only to non-financial institutions and is as follows:

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European Fixed Maturity Securities Exposure - By Country

As of March 31, 2012

(in millions of dollars)
	Fair Value		Amortized Cost
Greece	$	55.3	$	50.2
Ireland	61.4		66.7
Italy	213.2		219.3
Portugal	82.2		88.4
Spain	160.7		158.5
Total	$	572.8	$	583.1

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 March 31, 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.  As of March 31, 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 March 31, 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 March 31, 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 March 31, 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, lack of competitiveness, and recessionary pressures. As of March 31, 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 March 31, 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 require private sector participation. As of March 31, 2012, our holdings in Portugal consisted of two issuers, one of which was recently downgraded to below-investment grade. 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 March 31, 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.  We believe there are risks associated with Spain's high unemployment, large budget deficit, banking sector problems in which the market expects more impairment losses, and recessionary pressures.  All of our Spanish domiciled securities were rated investment-grade as of March 31, 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 March 31, 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.

A potential risk for these corporate holdings is access to bank lines in their countries of domicile and redenomination risk as it pertains to their outstanding liabilities.  Even in the scenario of currency redenomination and liquidity crisis, 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 $1,615.9 million and $1,612.3 million on an amortized cost basis at March 31, 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 two mortgage loans at March 31, 2012 and December 31, 2011 which were considered impaired. These mortgage loans were carried at the estimated net realizable values of $22.0 million and $22.5 million, respectively, net of a valuation allowance of $2.0 million and $1.5 million, respectively. During the first quarter of 2012, we determined that an additional mortgage loan was impaired, and we subsequently foreclosed on it and transferred it into other long-term investments in our consolidated balance sheets. No realized loss was recognized on the foreclosure.

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 $8.7 million at March 31, 2012. We held $42.6 million of cash collateral from our counterparties at March 31, 2012. The carrying value of fixed maturity securities posted as collateral to our counterparties was $135.1 million at March 31, 2012. We believe that our credit risk is mitigated by our use of multiple counterparties, all of which have a median credit rating of A 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 $54.8 million and $58.6 million on a fair value basis at March 31, 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 expect to make a voluntary contribution of approximately $53.0 million to our U.S. qualified defined benefit plan during 2012, none of which has yet been contributed. 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 expect to make contributions of approximately £2.9 million during 2012, £0.7 million of which was contributed during the first quarter of 2012.

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 has an expiration date of 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 quarter of 2012, we repurchased 7.5 million shares on the open market at a cost of $175.2 million. As of March 31, 2012 we had $349.7 million remaining under the $1.0 billion repurchase authorization.

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 $575 million and $756 million at March 31, 2012 and December 31, 2011, respectively. The decrease during the first quarter of 2012 reflects the repurchase of shares of our common stock. The March 31, 2012 balance, of which $98 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 2.75 years, and various money-market funds.  No significant restrictions exist on our ability to use or access these funds, with the exception of funds held in the U.K. We currently have no 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.

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Consolidated Cash Flows

Operating Cash Flows

Net cash provided by operating activities was $329.3 million for the first quarter of 2012, compared to $301.0 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 $181.8 million for the first quarter of 2012, compared to net cash provided of $188.0 million for the same period of 2011.

Our sales of available-for-sale securities decreased in the first quarter of 2012 compared to the same period of 2011 due to the lack of suitable available securities in which to reinvest our proceeds. Proceeds from maturities of available-for-sale securities were higher in the first quarter of 2012 compared to the same period of 2011 primarily due to a significant increase in bond calls and maturities. 

Proceeds from sales and maturities of other investments decreased slightly in the first quarter of 2012 compared to the same period of 2011 primarily due to a decrease in maturities from mortgage loans mostly offset by an increase in proceeds from terminations of derivative contracts within our cash flow hedging programs.  

Purchases of available-for-sale securities were lower in the first quarter of 2012 compared to the same period of 2011. Funds available for reinvestment increased during the first quarter of 2012 due to the increase in proceeds from bond calls and maturities, as previously noted. However, lower treasury rates and less favorable credit spreads resulted in the availability of fewer fixed maturity securities in which to invest to meet our investment objectives.

Purchases of other investments decreased in the first quarter of 2012 compared to the same period of 2011 as a result of a decrease in funding of mortgage loans, partially offset by a slight increase in funding of tax credit partnerships.

Net purchases of short-term investments increased in the first quarter of 2012 compared to the same period of 2011 due to the increase in bond calls and maturities, with the proceeds invested in short-term investments pending the purchase of fixed maturity investments. We also had an 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 quarter of 2011 to provide funding for payment for our debt maturing in March 2011.

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 $161.6 million for the first quarter of 2012, compared to $486.0 million in the same period of 2011.

During the first quarter of 2011, we made short-term debt repayments of $225.1 million at the maturity date of our remaining 7.625% senior notes due March 2011.

During each of the first quarters of 2012 and 2011, Tailwind Holdings made principal payments of $2.5 million on its floating rate, senior secured non-recourse notes and Northwind Holdings made principal payments of $15.0 million and $21.7 million, respectively, on its floating rate, senior secured non-recourse notes.

As of March 31, 2012, the amount outstanding under our securities lending program was $372.2 million. We did not utilize our securities lending program during the first quarter of 2011.

During the first quarter of 2012 and 2011, we repurchased 7.5 million and 8.6 million shares of Unum Group's common stock, respectively, at a cost of $175.2 million and $223.6 million, respectively. Approximately $7.9 million of the amount repurchased during the first quarter of 2011 was settled in April 2011.

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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 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 March 31, 2012, we had short-term debt of $372.2 million, consisting entirely of securities lending agreements, and long-term debt, including senior secured notes and junior subordinated debt securities, totaling $2,552.8 million. Our leverage ratio, when calculated using consolidated debt to total consolidated capital, was 28.9 percent at March 31, 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 23.4 percent at March 31, 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 increase in short-term debt related to securities lending agreements outstanding at March 31, 2012, partially offset by our principal payments on the debt of Northwind Holdings and Tailwind Holdings during the first quarter 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.

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.

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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 March 31, 2012, we had legally binding unfunded commitments of $152.0 million and $5.7 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 $81.0 million to fund certain investments in private placement fixed maturity securities, $84.9 million to fund certain private equity partnerships, and $29.9 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 three 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 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 $372.2 million of securities lending agreements outstanding which were collateralized by cash at March 31, 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 quarter of 2012 was $360.2 million, and the maximum amount outstanding at any month end was $372.2 million. In addition, at March 31, 2012, we had $16.4 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 quarter of 2012 was $16.4 million, and the maximum amount outstanding at any month end was $16.9 million.

We had no repurchase agreements outstanding at March 31, 2012, nor did we utilize any repurchase agreements during the first quarter 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 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.

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	AM Best	Fitch	Moody's	S&P
Issuer Credit Ratings	bbb (Good)	BBB (Good)	Baa3 (Adequate)	BBB- (Adequate)
Financial Strength Ratings
Provident Life and Accident	A (Excellent)	A (Strong)	A3 (Good)	A- (Strong)
Provident Life and Casualty	A (Excellent)	A (Strong)	Not Rated	Not Rated
Unum Life of America	A (Excellent)	A (Strong)	A3 (Good)	A- (Strong)
First Unum Life	A (Excellent)	A (Strong)	A3 (Good)	A- (Strong)
Colonial Life & Accident	A (Excellent)	A (Strong)	A3 (Good)	A- (Strong)
Paul Revere Life	A (Excellent)	A (Strong)	A3 (Good)	A- (Strong)
Paul Revere Variable	B++(Good)	A (Strong)	A3 (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, Fitch affirmed its A rating of Unum Group and its domestic subsidiaries and affirmed the senior debt rating at BBB. Fitch's rating outlook for Unum Group is "stable."  

There have been no other changes in any of the rating agencies' outlook statements or ratings during the first three 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.

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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 three 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 March 31, 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 March 31, 2012 that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

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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 first 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)
January 1 - January 31, 2012	—	$	—	—	$	524,749,018
February 1 - February 29, 2012	3,735,385	22.86		3,735,385	439,349,876
March 1 - March 31, 2012	3,781,247	23.70		3,781,247	349,733,585
Total	7,516,632			7,516,632

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

(2) On February 2, 2011, our board of directors authorized the repurchase of up to $1.0 billion of Unum Group's common stock through August 2012.

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ITEM 6. EXHIBITS

Index to Exhibits

Exhibit 10.1	Board Consulting Agreement between Unum Group and Robert O. Best dated as of April 16, 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 March 31, 2012, filed on May 2, 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.

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SIGNATURES

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

		Unum Group
		(Registrant)
Date:	May 2, 2012	/s/ Thomas R. Watjen
		Thomas R. Watjen
		President and Chief Executive Officer
Date:	May 2, 2012	/s/ Richard P. McKenney
		Richard P. McKenney
		Executive Vice President and Chief Financial Officer
Date:	May 2, 2012	/s/ Vicki W. Corbett
		Vicki W. Corbett
		Senior Vice President, Controller

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EX-10.1

EXHIBIT 10.1

BOARD CONSULTING AGREEMENT

THIS BOARD CONSULTING AGREEMENT (this "Agreement") is entered into as of the 16th day of April, 2012, by and between Unum Group, a Delaware corporation having its principal executive offices in Chattanooga, Tennessee (the "Company"), and Robert O. Best (the "Consultant").

WITNESSETH:

WHEREAS, prior to his retirement from the Company on December 31, 2011 (the "Retirement Date"), the Consultant worked for 39 years in increasingly senior positions with the Company and its subsidiaries and affiliates, including predecessor companies to such entities, most recently as the Company's Executive Vice President, Global Services, in which position he had responsibility for all areas of the Company's information technology ("IT"); and

WHEREAS, through such work and experiences, the Consultant has acquired valuable knowledge and expertise regarding the business of the Company (the "Business"), the area of IT and interrelationships or potential interrelationships between the Business and IT; and

WHEREAS, the Company desires to receive the benefit of such knowledge and expertise by engaging the Consultant to serve as an advisor to the Board of Directors of the Company (the "Board of Directors") with respect to its governance and oversight of the foregoing matters; and

WHEREAS, the Consultant desires to serve in such advisory capacity, upon the terms and subject to the conditions set forth herein.

NOW, THEREFORE, in consideration of the mutual promises and agreements contained herein and other good and valuable consideration, the receipt and sufficiency of which are hereby acknowledged, the Company and the Consultant hereby agree as follows:

1.Consulting Period. The Consultant shall render consulting services to the Board of Directors, on the terms and conditions set forth in this Agreement, for the period beginning on April 16, 2012 and ending on April 15, 2013, inclusive, unless this Agreement shall be earlier terminated in accordance with Section 8 hereof (the "Consulting Period").

2.Consulting Services. During the Consulting Period, the Consultant shall make himself available and serve as a resource to the Board of Directors on a broad range of operations and technology related matters, including, without limitation, being available to (i) speak to, among other things, general operations and technology trends impacting the Company's industry, operations and technology governance trends, and the changing strategic role of technology within the Company's industry, and (ii) the Board of Directors or individual directors as a resource on any operational or technology matter that emerges in the role of any director of the Company. Such consulting services shall be performed at such place or places as shall be mutually agreed upon by the Consultant and the Company. In no event shall the Consultant be required or permitted to provide consulting services for more than 32 hours in any month during the Consulting Period. Notwithstanding any other provision of this Agreement to the contrary, during the Consulting Period, the amount of time the Consultant will spend on providing the consulting services required under this Agreement shall be limited so that the Consultant's termination of employment on the Retirement Date will constitute the Consultant's "separation from service" with the Company as such term is defined under Section 1.409A-1(h) of the regulations promulgated under the Internal Revenue Code of 1986, as amended (the "Code").

3.Consideration and Invoicing. In consideration of the consulting services to be provided by the Consultant pursuant to Section 2 and in consideration for the covenants of the Consultant set forth herein, during the Consulting Period, the Company agrees to pay to the Consultant, and the Consultant agrees to accept as full compensation, a fee in the amount of $250 per hour of consulting services provided hereunder (the "Consulting Fee"), payable within thirty (30) days following receipt of a monthly written invoice from the Consultant. Each invoice shall specify, in reasonable detail, all services provided during the period to which the invoice relates (itemizing each type of service), the dates on which the services were provided, the number of hours spent in providing each service and the total amount due under the invoice. To be eligible for reimbursement of expenses pursuant to Section 4, the Consultant must include, in or with an invoice, a description of such expenses and receipts evidencing the incurrence of such expenses. If the Consultant fails to invoice the Company for any specific charge or expense within a period of ninety (90) days after the date of such charge or expense, then the Company shall not be obligated to pay or reimburse the Consultant for such charge or expense.

4.Expenses. The Company shall reimburse the Consultant for any reasonable business expenses incurred by the Consultant in connection with the performance of the consulting services described in Section 2. In determining whether any expense is reimbursable under this Agreement, the Company's reimbursement policies shall apply.

5.Sole Consideration. Except as specifically provided herein, the Consultant shall be entitled to no compensation or benefits with respect to the consulting services from the Company, and under no circumstances shall the Consultant be credited with any service for purposes of eligibility, vesting or benefit accrual under any employee benefit plan of the Company.

6.Interests of the Company and Confidential Information. The Consultant covenants to act in the best interests of the Company through the Consulting Period. The Consultant acknowledges that, as an advisor to the Board of Directors, he will be making use of, acquiring and adding to confidential information of a special and unique nature and value relating to the Company and its Business. Accordingly, the Consultant further covenants that, except as required by law or legal process, he shall not, directly or indirectly, at any time during the Consulting Period or thereafter, without the prior written consent of the Company, use for his own benefit or the benefit of any other person or entity other than the Company and its affiliates or disclose to any person, other than a director or employee of the Company to whom disclosure is necessary to the performance by the Consultant of his duties as an advisor hereunder, any confidential, proprietary, secret or privileged information about the Company or its affiliates or their businesses, affairs or operations (the "Confidential Information"). The Consultant acknowledges and agrees that all Confidential Information is critical to the successful conduct of the Business and that the Confidential Information is and shall remain the exclusive property of the Company or its affiliates, as the case may be. For purposes of the foregoing, the term Confidential Information shall not include information that becomes generally available to the public, other than as a result of disclosure by the Consultant. The Consultant shall have no power or authority to contract in the name of or bind the Company or its affiliates, to speak on behalf of the Company or to engage in any negotiations or discussions on its behalf. The provisions of this Section 6 shall survive and continue in full force and effect in accordance with its terms, without limitation as to geographic application, notwithstanding any termination of the Consulting Period or this Agreement.

7.Status as an Independent Contractor. The Company and the Consultant acknowledge and agree that the Company shall not exercise general supervision or control over the time, place or manner in which the Consultant provides consulting services hereunder, and that in performing consulting services pursuant to this Agreement the Consultant shall be acting and shall act at all times as an independent contractor only and not as an employee, agent, partner or joint venturer of or with the Company or any entity for which the Company provides services.

8.Termination of Agreement.

(a)Time of Termination. This Agreement shall terminate upon the first to occur of:

(1)11:59 p.m. on April 15, 2013.

(2)The date specified by the Consultant in a notice of termination delivered to the Company.

(3)The date specified by the Company in a notice of termination, with or without Cause, delivered to the Consultant. For purposes of this Agreement, "Cause" shall mean: (i) the continued failure of the Consultant to be available to perform substantially the Consultant's duties hereunder; (ii) the willful engaging by the Consultant in illegal conduct or gross misconduct which is materially and demonstrably injurious to the Company or any of its affiliates; (iii) the Consultant's conviction of a felony or a guilty or nolo contendere plea by the Consultant with respect thereto; or (iv) the breach by the Consultant of any provision of this Agreement.

(4)The death or disability of the Consultant such that the Consultant could not reasonably be expected to perform his duties for a period exceeding 90 consecutive days.

(b)Payments Upon Termination. Subject to the provisions of Section 3, upon termination of this Agreement the Company shall have no further obligation hereunder other than the payment of (i) any unpaid Consulting Fee relating to consulting services provided prior to the date of such termination, and (ii) any unreimbursed expenses that were incurred by the Consultant prior to the date of such termination and for which reimbursement is due under Section 4.

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

If to the Consultant:

At the last address delivered to the Company by the Consultant as provided herein;

If to the Company:

Unum Group

1 Fountain Square

Chattanooga, Tennessee 37402

Attention: General Counsel;

or to such other address as either party shall have furnished to the other in writing in accordance herewith. Notice and communications shall be effective when actually received by the addressee.

10.Miscellaneous. This Agreement constitutes the entire agreement and understanding between the parties with respect to the subject matter hereof and supersedes all prior understandings, agreements or representations by the parties, written or oral, which may have related in any manner to the subject matter hereof. This Agreement will be binding upon, inure to the benefit of and be enforceable by, as applicable, the Company and the Consultant and their respective personal or legal representatives, executors, administrators, successors, assigns, heirs, distributees and legatees. This Agreement is personal in nature and the Consultant shall not, without the written consent of the Company, assign, transfer or delegate this Agreement or any rights or obligations hereunder. This Agreement shall be governed by and construed in accordance with the laws of the State of Delaware without giving effect to such state's laws and principles regarding the conflict of laws. No provision of this Agreement may be amended, modified, waived or discharged unless such amendment, waiver, modification or discharge is agreed to in writing and such writing is signed by the Consultant and the Company. The headings of this Agreement are for reference purposes only and shall not affect in any way the meaning or interpretation of this Agreement. This Agreement may be executed in one or more counterparts, each of which shall be deemed an original but all of which together will constitute one and the same instrument. Each party hereto shall execute such additional documents, and do such additional things, as may reasonably be requested by the other party to effectuate the purposes and provisions of this Agreement.

11.Taxes. The Consultant acknowledges that he is solely responsible for the payment of all Federal, state, local and foreign taxes that are imposed by applicable laws and regulations with respect to any Consulting Fee payable or benefits provided to the Consultant hereunder in his capacity as a consultant. With regard to any provision herein that provides for reimbursement of costs and expenses or in-kind benefits, except as permitted by Section 409A of the Code, all reimbursements and in-kind benefits provided under this Agreement shall be made or provided in accordance with the requirements of Section 409A of the Code to the extent that such reimbursements or in-kind benefits are subject to Section 409A of the Code, including, where applicable, the requirements that (a) any reimbursement is for expenses incurred during Consultant's lifetime (or during a shorter period of time specified in this Agreement), (b) the amount of expenses eligible for reimbursement during a calendar year may not affect the expenses eligible for reimbursement in any other calendar year, (c) the reimbursement of an eligible expense will be made on or before the last day of the calendar year following the year in which the expense is incurred and (d) the right to reimbursement is not subject to set off or liquidation or exchange for any other benefit.

[Remainder of page intentionally left blank]

IN WITNESS WHEREOF, the parties have caused this Agreement to be duly executed and delivered as of the date first above written.

UNUM GROUP

By: /s/ Liston Bishop III

Name: Liston Bishop III

Title: Executive Vice President and General Counsel

CONSULTANT

By:     /s/ Robert O. Best

Name: Robert O. Best

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, and

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

of our report dated May 2, 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 March 31, 2012.

/s/ ERNST & YOUNG LLP

Chattanooga, Tennessee

May 2, 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:	May 2, 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:	May 2, 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 March 31, 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:	May 2, 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 March 31, 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:	May 2, 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	Mar. 31, 2012	Dec. 31, 2011
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans	$ 1,615.9	$ 1,612.3
Percent of Total	100.00%	100.00%
Apartment
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans	27.8	28.0
Percent of Total	1.70%	1.80%
Industrial
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans	504.5	502.0
Percent of Total	31.20%	31.10%
Mixed
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans	93.0	93.5
Percent of Total	5.80%	5.80%
Office
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans	663.8	659.3
Percent of Total	41.10%	40.90%
Retail
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans	319.8	322.4
Percent of Total	19.80%	20.00%
Other
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans	$ 7.0	$ 7.1
Percent of Total	0.40%	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
	Mar. 31, 2012	Mar. 31, 2011
Segment Reporting, Revenue Reconciling Item [Line Items]
Operating Revenue by Segment	$ 2,598.9	$ 2,547.9
Net Realized Investment Gain	12.4	15.2
Revenue	2,611.3	2,563.1
Operating Income by Segment	309.2	320.2
Net Realized Investment Gain	12.4	15.2
Amortization of Actuarial Loss	(11.6)	(8.0)
Income Tax	96.1	103.8
Net Income	$ 213.9	$ 223.6

XML

Notional Amounts for Each Category of Derivative Activity (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Derivative [Line Items]
Balance at beginning of period	$ 1,413.0	$ 1,681.9
Additions	35.0	19.9
Terminations	83.9	85.9
Balance at ending of period	1,364.1	1,615.9
Swaps | Receive Variable/Pay Fixed
Derivative [Line Items]
Balance at beginning of period	174.0	174.0
Additions	0	0
Terminations	0	0
Balance at ending of period	174.0	174.0
Swaps | Receive Fixed/Pay Fixed
Derivative [Line Items]
Balance at beginning of period	554.0	617.9
Additions	0	0
Terminations	3.9	11.0
Balance at ending of period	550.1	606.9
Swaps | Receive Fixed/Pay Variable
Derivative [Line Items]
Balance at beginning of period	685.0	890.0
Additions	0	0
Terminations	45.0	55.0
Balance at ending of period	640.0	835.0
Forwards
Derivative [Line Items]
Balance at beginning of period	0	0
Additions	35.0	19.9
Terminations	35.0	19.9
Balance at ending of period	$ 0	$ 0

XML

Premium Income by Major Line of Business within Each Segment (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Segment Reporting Information [Line Items]
Premiums Earned, Net	$ 1,921.9	$ 1,869.5
Unum U.S.
Segment Reporting Information [Line Items]
Premiums Earned, Net	1,112.0	1,068.8
Unum U.S. | Group Long term Disability
Segment Reporting Information [Line Items]
Premiums Earned, Net	395.5	397.0
Unum U.S. | Group Short-term Disability
Segment Reporting Information [Line Items]
Premiums Earned, Net	117.7	111.0
Unum U.S. | Group Life
Segment Reporting Information [Line Items]
Premiums Earned, Net	293.6	273.4
Unum U.S. | Accidental Death & Dismemberment
Segment Reporting Information [Line Items]
Premiums Earned, Net	28.3	27.1
Unum U.S. | Individual Disability-Recently Issued
Segment Reporting Information [Line Items]
Premiums Earned, Net	118.4	115.1
Unum U.S. | Voluntary Benefits
Segment Reporting Information [Line Items]
Premiums Earned, Net	158.5	145.2
Unum U.K.
Segment Reporting Information [Line Items]
Premiums Earned, Net	170.7	167.1
Unum U.K. | Group Long term Disability UK
Segment Reporting Information [Line Items]
Premiums Earned, Net	101.9	103.4
Unum U.K. | Group Life UK
Segment Reporting Information [Line Items]
Premiums Earned, Net	52.7	47.6
Unum U.K. | Supplemental and Voluntary UK
Segment Reporting Information [Line Items]
Premiums Earned, Net	16.1	16.1
Colonial Life
Segment Reporting Information [Line Items]
Premiums Earned, Net	296.3	280.4
Colonial Life | Accident, Sickness, and Disability - Colonial
Segment Reporting Information [Line Items]
Premiums Earned, Net	180.2	172.3
Colonial Life | Life Colonial
Segment Reporting Information [Line Items]
Premiums Earned, Net	51.7	46.2
Colonial Life | Cancer and Critical Illness - Colonial
Segment Reporting Information [Line Items]
Premiums Earned, Net	64.4	61.9
Closed Block
Segment Reporting Information [Line Items]
Premiums Earned, Net	342.9	353.2
Closed Block | Individual Disability Closed Block
Segment Reporting Information [Line Items]
Premiums Earned, Net	187.2	202.3
Closed Block | Long-term Care
Segment Reporting Information [Line Items]
Premiums Earned, Net	155.2	150.6
Closed Block | All Other Segments
Segment Reporting Information [Line Items]
Premiums Earned, Net	$ 0.5	$ 0.3

XML

Realized Investment Gains and Losses Reported in Consolidated Statements of Income (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Fixed Maturity Securities
Gross Gains on Sales	$ 5.9	$ 9.5
Gross Losses on Sales	(5.0)	(6.9)
Other-Than-Temporary Impairment Loss	0	(2.3)
Mortgage Loans and Other Invested Assets
Gross Gains on Sales	0	1.2
Impairment Loss	(0.5)	0
Embedded Derivative in Modified Coinsurance Arrangement	12.3	14.1
Foreign Currency Transactions	(0.3)	(0.4)
Net Realized Investment Gain	$ 12.4	$ 15.2

XML

Fair Values of Financial Instruments Level 3 Quantitative Sensitivity Analysis (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012		Dec. 31, 2011
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Fixed Maturity Securities	$ 42,411.2		$ 42,486.7
Equity Securities	12.6		11.2
States, Municipalities, and Political Subdivisions
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Fixed Maturity Securities	1,556.4		1,591.6
Mortgage/Asset-backed Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Fixed Maturity Securities	2,842.3		2,973.2
All Other Corporate Bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Fixed Maturity Securities	24,865.8		24,550.1
Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Fixed Maturity Securities	1,399.5		1,141.4
Equity Securities	4.5		11.2
Fair Value, Inputs, Level 3 [Member] | States, Municipalities, and Political Subdivisions
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Fixed Maturity Securities	66.4		68.1
Fair Value, Investments, Valuation Techniques	- Comparability Adjustment - Discount for Size - Volatility of Credit
Investments, Fair Value Disclosure, Significant Assumptions	0.50% - 1.25%/0.87% 0.20% - 0.20%/0.20% 0.25% - 0.25%/0.25%	[1],[2],[3]
Fair Value, Inputs, Level 3 [Member] | Mortgage/Asset-backed Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Fixed Maturity Securities	21.3		31.7
Fair Value, Investments, Valuation Techniques	- Discount for Size
Investments, Fair Value Disclosure, Significant Assumptions	4.99% - 5.08%/5.06%	[2]
Fair Value, Inputs, Level 3 [Member] | All Other Corporate Bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Fixed Maturity Securities	733.2		665.5
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	1.65% - 1.65%/1.65% 0.03% - 0.75%/0.50% 0.50% - 0.50%/0.50% 0.50% - 1.00%/0.74% (0.50)% - 7.72%/1.27% Priced at Par	[1],[2],[3],[4],[5],[6]
Fair Value, Inputs, Level 3 [Member] | Corporate Bond Securities
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
Investments, Fair Value Disclosure, Significant Assumptions	0.25% - 0.47%/0.27% 0.25% - 0.50%/0.41% 0.25% - 0.25%/0.25%	[1],[2],[4]
Fair Value, Inputs, Level 3 [Member] | Equity Securites
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	[6]
Fair Value, Inputs, Level 3 [Member] | 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] | Fair Value, Inputs, Level 3 [Member] | States, Municipalities, and Political Subdivisions
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Fixed Maturity Securities	66.4
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value, Inputs, Level 3 [Member] | Mortgage/Asset-backed Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Fixed Maturity Securities	0.6
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value, Inputs, Level 3 [Member] | All Other Corporate Bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Fixed Maturity Securities	295.6
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value, Inputs, Level 3 [Member] | Corporate Bond Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Fixed Maturity Securities	117.5
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value, Inputs, Level 3 [Member] | Equity Securites
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Equity Securities	4.0
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value, Inputs, Level 3 [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	$ (123.4)

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

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

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

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

[5] Represents basis point adjustments to apply a discount due to illiquidity

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

[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	Mar. 31, 2012	Dec. 31, 2011
Segment Reporting Information [Line Items]
Assets	$ 59,571.8	$ 59,555.2
Unum U.S.
Segment Reporting Information [Line Items]
Assets	18,621.5	18,583.6
Unum U.K.
Segment Reporting Information [Line Items]
Assets	3,746.8	3,549.5
Colonial Life
Segment Reporting Information [Line Items]
Assets	3,209.3	3,167.8
Closed Block
Segment Reporting Information [Line Items]
Assets	31,306.2	31,439.5
Corporate
Segment Reporting Information [Line Items]
Assets	$ 2,688.0	$ 2,814.8

XML

Pensions and Other Postretirement Benefits (Tables)

3 Months Ended

Mar. 31, 2012

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

Net Periodic Benefit Costs

	Three Months Ended March 31
	Pension Benefits
	U.S. Plans						Non U.S. Plans						OPEB
	2012			2011			2012			2011			2012			2011
	(in millions of dollars)
Service Cost	$	12.2		$	10.6		$	1.2		$	1.2		$	0.4		$	0.5
Interest Cost	21.1			19.4			2.1			2.2			2.4			2.5
Expected Return on Plan Assets	(22.2		)	(21.9		)	(2.7		)	(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		$	16.0		$	0.7		$	0.3		$	2.0		$	2.2

XML

Location and Fair Values of Derivative Financial Instruments (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Designated as Hedging Instrument | Other Long term Investments
Derivative [Line Items]
Asset Derivatives Fair Value	$ 111.9	$ 137.7
Designated as Hedging Instrument | Other Liability
Derivative [Line Items]
Liability Derivatives Fair Value	174.3	173.7
Designated as Hedging Instrument | Interest Rate Swaps | Other Long term Investments
Derivative [Line Items]
Asset Derivatives Fair Value	109.0	134.2
Designated as Hedging Instrument | Interest Rate Swaps | Other Liability
Derivative [Line Items]
Liability Derivatives Fair Value	31.2	32.9
Designated as Hedging Instrument | Foreign Exchange Contracts | Other Long term Investments
Derivative [Line Items]
Asset Derivatives Fair Value	2.9	3.5
Designated as Hedging Instrument | Foreign Exchange Contracts | Other Liability
Derivative [Line Items]
Liability Derivatives Fair Value	143.1	140.8
Not Designated as Hedging Instrument | Embedded Derivative in Modified Coinsurance Arrangement | Other Liability
Derivative [Line Items]
Liability Derivatives Fair Value	$ 123.4	$ 135.7

XML

Mortgage Loans, Sorted by Applicable Credit Quality Indicators, Loan to Value Ratio (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans	$ 1,615.9	$ 1,612.3
Loan to Value Ratio Below or Equal to 65 Percent
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans	614.7	578.4
Loan To Value Ratio Above 65 To 75 Percent
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans	778.3	802.3
Loan To Value Ratio Above 75 To 85 Percent
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans	171.6	165.1
Loan To Value Ratio Above 85 Percent
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans	$ 51.3	$ 66.5

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Distribution of the Maturity Dates for Fixed Maturity Securities (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Available-for-Sale Securities, Total Amortized Cost
1 year or less	$ 617.5	$ 715.1
Over 1 year through 5 years	5,281.0	5,161.5
Over 5 years through 10 years	9,659.8	9,630.5
Over 10 years	18,825.3	18,499.0
Available-for-sale Securities, Debt Maturities, Gross Subtotal	34,383.6	34,006.1
Mortgage/Asset-Backed Securities	2,504.4	2,634.6
Total Fixed Maturity Securities	36,888.0	36,640.7
Available-for-Sale Securities, Unrealized Gain Position, Gross Gain
1 year or less	17.3	16.0
Over 1 year through 5 years	496.2	449.8
Over 5 years through 10 years	1,315.4	1,266.3
Over 10 years	3,512.9	3,992.0
Available-For-Sale Securities, Debt Maturities Unrealized Gain Position, Gross Gain, Gross Subtotal, Total	5,341.8	5,724.1
Mortgage/Asset-Backed Securities	338.8	344.1
Total Fixed Maturity Securities	5,680.6	6,068.2
Available-for-Sale Securities, Unrealized Loss Position, Gross Loss
1 year or less	0	0.1
Over 1 year through 5 years	6.2	20.7
Over 5 years through 10 years	34.5	52.8
Over 10 years	115.8	143.1
Available-For-Sale Securities, Debt Maturities Unrealized Gain Position, Gross Loss, Gross Subtotal, Total	156.5	216.7
Mortgage/Asset-Backed Securities	0.9	5.5
Total Fixed Maturity Securities	157.4	222.2
Available-for-Sale Securities, Unrealized Gain Position, Fair Value
Fair Value Maturity Distribution [Abstract]
1 year or less	629.8	701.4
Over 1 year through 5 years	5,428.0	4,949.0
Over 5 years through 10 years	10,269.9	9,903.8
Over 10 years	20,874.5	21,082.2
Available-for-sale Securities, Debt Maturities, Fair Value, Gross Subtotal, Total	37,202.2	36,636.4
Mortgage/Asset-Backed Securities	2,794.7	2,859.4
Total Fixed Maturity Securities	39,996.9	39,495.8
Available-for-Sale Securities, Unrealized Loss Position, Fair Value
Fair Value Maturity Distribution [Abstract]
1 year or less	5.0	29.6
Over 1 year through 5 years	343.0	641.6
Over 5 years through 10 years	670.8	940.2
Over 10 years	1,347.9	1,265.7
Available-for-sale Securities, Debt Maturities, Fair Value, Gross Subtotal, Total	2,366.7	2,877.1
Mortgage/Asset-Backed Securities	47.6	113.8
Total Fixed Maturity Securities	$ 2,414.3	$ 2,990.9

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Location of and Gain (Loss) on Embedded Derivative in a Modified Coinsurance Arrangement (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in Net Realized Investment Gain	$ 12.3	$ 14.1

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Stockholders' Equity and Earnings Per Common Share - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended			6 Months Ended	12 Months Ended	3 Months Ended	12 Months Ended
	Mar. 31, 2012	Jun. 30, 2011	Mar. 31, 2011	Jun. 30, 2011	Dec. 31, 2011	Mar. 31, 2011 Share Repurchase Program Expire In August 2012	Dec. 31, 2010 Share Repurchase Program Expire in May 2011 [Member]	Mar. 31, 2012 Minimum [Member]	Mar. 31, 2012 Maximum [Member]
Stockholders Equity Note [Line Items]
Outstanding stock options, exercise prices range, lower limit								$ 11.37	$ 26.29
Outstanding Nonvested stock awards, grant prices range, lower limit	$ 11.37
Outstanding Nonvested stock awards, grant prices range, upper limit	$ 26.31
Outstanding Performance restricted stock units, threshold stock price	$ 26.00
Antidilutive common shares not included in the computation of dilutive earnings per share	2,200,000		1,900,000
Authorized repurchase of common stock, value						$ 1,000.0	$ 500.0
Treasury Stock Acquired, Shares	7,500,000	600,000	7,100,000	7,700,000	17,700,000
Common stock repurchased	175.2		200.0		419.9
Shares repurchased cost, Commissions	0.2				0.3
Stock Repurchase Program Remaining Authorized Repurchase Amount	$ 349.7
Treasury Stock Shares Retired			7,700,000
Preferred stock, authorized	25,000,000
Preferred stock, par value	$ 0.10
Preferred stock, issued	0

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Investments - Additional Information (Detail) (USD $)	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Dec. 31, 2011
Schedule of Investments [Line Items]
Fair value of fixed maturity securities, gross unrealized gain	$ 5,680,600,000		$ 6,068,200,000
Fair Value of fixed maturity securities, gross unrealized loss	157,400,000		222,200,000
Defaults on securities not OTTI	0
Commitment to fund private placement fixed maturity securities	81,000,000
Carrying amount of variable interest entity investments	444,200,000
Unfunded commitment to fund Investment Partnerships	152,000,000
Commitment to fund partnership Equity Investments	84,900,000
Other Long-term Investments	635,500,000		639,200,000
Mortgage Loan policy is not to exceed a loan-to-value ratio, percent	75.00%
Mortage Loan Policy Debt Service coverage ratio lower range	125.00%
Mortgage Loans issuance, term years	25
Impaired Financing Receivable, Average Recorded Investment	23,700,000	13,100,000
Interest income recognized on mortgage loans subsequent to impairment	200,000	300,000
Financing Receivable, Recorder Investment, Nonaccrual status	1		1
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	8,900,000		9,400,000
commitment to fund commercial mortgage loans	29,900,000
Repurchase agreements - Typical Days outstanding	30
Minimum percent of the fair value of securities loaned or securities purchased under repurchase agreements be maintained as collateral	102.00%
Cash Collateral for Borrowed Securities	372,200,000		312,300,000
Securities Loaned	374,100,000		319,100,000
Securities Received as Collateral	16,400,000		16,700,000
Outstanding Repurchase Agreements	0.0		0
Nonperforming Financing Receivable [Member]
Schedule of Investments [Line Items]
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	90		90
Partnership Interests In Tax Credit Investments
Schedule of Investments [Line Items]
Carrying amount of variable interest entity investments	339,200,000
Equity Method Investments
Schedule of Investments [Line Items]
Carrying amount of variable interest entity investments	105,000,000
Bonds
Schedule of Investments [Line Items]
Fair value of fixed maturity securities	125,000,000
Nonredeemable Preferred Stock
Schedule of Investments [Line Items]
Other Long-term Investments	100,000
Partnership Interest
Schedule of Investments [Line Items]
Other Long-term Investments	8,600,000
External Credit Rating, Investment Grade
Schedule of Investments [Line Items]
Fair value of fixed maturity securities	39,474,500,000
Fair value of fixed maturity securities, gross unrealized gain	5,533,200,000
Fair Value of fixed maturity securities, gross unrealized loss	88,000,000
Fixed maturity securities in unrealized loss position, percent of total	55.90%
Number of fixed maturity securities that were in an unrealized loss position	88
Number of fixed maturity securities in an unrealized loss position continuously for over one year	30
External Credit Rating, Non Investment Grade
Schedule of Investments [Line Items]
Fair value of fixed maturity securities	2,936,700,000
Fair value of fixed maturity securities, gross unrealized gain	147,400,000
Fair Value of fixed maturity securities, gross unrealized loss	$ 69,400,000
Fixed maturity securities in unrealized loss position, percent of total	44.10%
Number of fixed maturity securities that were in an unrealized loss position	45
Number of fixed maturity securities in an unrealized loss position continuously for over one year	20

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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Cash Flows from Operating Activities
Net Income	$ 213.9	$ 223.6
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities
Change in Receivables	1.6	33.8
Change in Deferred Acquisition Costs	(18.0)	(17.2)
Change in Insurance Reserves and Liabilities	167.3	112.6
Change in Income Taxes	116.7	82.0
Change in Other Accrued Liabilities	(68.0)	(32.1)
Non-cash Adjustments to Net Investment Income	(100.9)	(112.6)
Net Realized Investment Gain	(12.4)	(15.2)
Depreciation	20.5	19.3
Other, Net	8.6	6.8
Net Cash Provided by Operating Activities	329.3	301.0
Cash Flows from Investing Activities
Proceeds from Sales of Fixed Maturity Securities	127.6	243.7
Proceeds from Maturities of Fixed Maturity Securities	596.3	400.5
Proceeds from Sales and Maturities of Other Investments	33.5	35.5
Purchase of Fixed Maturity Securities	(845.7)	(898.6)
Purchase of Other Investments	(52.6)	(92.9)
Net Sales (Purchases) of Short-term Investments	(17.2)	524.4
Other, Net	(23.7)	(24.6)
Net Cash (Used) Provided by Investing Activities	(181.8)	188.0
Cash Flows from Financing Activities
Net Short-term Debt Borrowings (Repayments)	59.9	(225.1)
Long-term Debt Repayments	(17.5)	(24.2)
Issuance of Common Stock	0.9	5.5
Repurchase of Common Stock	(175.2)	(215.7)
Dividends Paid to Stockholders	(31.4)	(29.9)
Other, Net	1.7	3.4
Net Cash Used by Financing Activities	(161.6)	(486.0)
Net Increase (Decrease) in Cash and Bank Deposits	(14.1)	3.0
Cash and Bank Deposits at Beginning of Year	116.6	53.6
Cash and Bank Deposits at End of Period	$ 102.5	$ 56.6

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Commitments and Contingent Liabilities - Additional Information (Detail)	Mar. 31, 2012
Commitments and Contingencies Disclosure [Line Items]
States involved in unclaimed property examination	26
Insurers requested to cross-check benefits	160

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Activity in Allowance for Credit Losses (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance at Beginning of Year	$ 1.5	$ 1.5
Provisions	0.5	0
Balance at End of Period	$ 2.0	$ 1.5

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Carrying Amount and Fair Value of Financial Instruments (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Assets
Fixed Maturity Securities	$ 42,411.2	$ 42,486.7
Mortgage Loans	1,615.9	1,612.3
Policy Loans	3,049.0	3,051.4
Other Long-term Investments
Derivatives	111.9	137.7
Equity Securities	12.6	11.2
Miscellaneous Long-term Investments	635.5	639.2
Policyholders' Funds
Long-term Debt	2,552.8	2,570.2
Other Liabilities
Derivatives	297.7	309.4
Unfunded commitment to fund Investment Partnerships	152.0
Carrying Amount
Assets
Fixed Maturity Securities	42,411.2	42,486.7
Mortgage Loans	1,615.9	1,612.3
Policy Loans	3,049.0	3,051.4
Other Long-term Investments
Derivatives	111.9	137.7
Equity Securities	12.6	11.2
Miscellaneous Long-term Investments	452.8	436.4
Policyholders' Funds
Deferred Annuity Products	641.1	641.1
Supplementary Contracts without Life Contingencies	508.7	502.6
Long-term Debt	2,552.8	2,570.2
Other Liabilities
Derivatives	174.3	173.7
Embedded Derivative in Modified Coinsurance Arrangement	123.4	135.7
Unfunded commitment to fund Investment Partnerships	152.0	160.6
Fair Value
Assets
Fixed Maturity Securities	42,411.2	42,486.7
Mortgage Loans	1,792.1	1,789.8
Policy Loans	3,115.4	3,124.4
Other Long-term Investments
Derivatives	111.9	137.7
Equity Securities	12.6	11.2
Miscellaneous Long-term Investments	452.8	436.4
Policyholders' Funds
Deferred Annuity Products	641.1	641.1
Supplementary Contracts without Life Contingencies	508.7	502.6
Long-term Debt	2,585.8	2,540.2
Other Liabilities
Derivatives	174.3	173.7
Embedded Derivative in Modified Coinsurance Arrangement	123.4	135.7
Unfunded commitment to fund Investment Partnerships	$ 152.0	$ 160.6

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Accounting Developments 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

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Selected Operating Statement Data by Segment (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Segment Reporting Information [Line Items]
Premium Income	$ 1,921.9	$ 1,869.5
Net Investment Income	619.5	618.7
Other Income	57.5	59.7
Operating Revenue	2,598.9	2,547.9
Operating Income (Loss)	309.2	320.2
Interest and Debt Expense	35.5	37.9
Unum U.S.
Segment Reporting Information [Line Items]
Premium Income	1,112.0	1,068.8
Net Investment Income	238.6	233.7
Other Income	31.1	31.0
Operating Revenue	1,381.7	1,333.5
Operating Income (Loss)	205.9	194.7
Unum U.K.
Segment Reporting Information [Line Items]
Premium Income	170.7	167.1
Net Investment Income	36.5	44.9
Other Income	0.1	0.1
Operating Revenue	207.3	212.1
Operating Income (Loss)	38.8	48.9
Colonial Life
Segment Reporting Information [Line Items]
Premium Income	296.3	280.4
Net Investment Income	35.6	31.3
Other Income	0.1	0.1
Operating Revenue	332.0	311.8
Operating Income (Loss)	69.7	66.5
Closed Block
Segment Reporting Information [Line Items]
Premium Income	342.9	353.2
Net Investment Income	301.6	294.3
Other Income	25.9	27.5
Operating Revenue	670.4	675.0
Operating Income (Loss)	15.4	31.9
Corporate
Segment Reporting Information [Line Items]
Premium Income	0	0
Net Investment Income	7.2	14.5
Other Income	0.3	1.0
Operating Revenue	7.5	15.5
Operating Income (Loss)	$ (20.6)	$ (21.8)

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Impaired Mortgage Loans (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Recorded Investment		$ 22.5
Unpaid Principal Balance		24.0
Related Allowance		1.5
Impaired Fin Receivables with Allowance [Member]
Recorded Investment	22.0	13.1
Unpaid Principal Balance	24.0	14.6
Related Allowance	2.0	1.5
Impaired Fin Receivables with No Related Allowance [Member]
Recorded Investment		9.4
Unpaid Principal Balance		9.4
Related Allowance		$ 0

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Fair Value Measurements by Input Level (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Fixed Maturity Securities
Fixed Maturity Securities	$ 42,411.2	$ 42,486.7
Other Long-term Investments
Derivative Assets	111.9	137.7
Equity Securities	12.6	11.2
Other Liabilities
Derivative Liabilities	297.7	309.4
Interest Rate Swap [Member]
Other Long-term Investments
Derivative Assets	109.0	134.2
Other Liabilities
Derivative Liabilities	31.2	32.9
Foreign Exchange Contracts
Other Long-term Investments
Derivative Assets	2.9	3.5
Other Liabilities
Derivative Liabilities	143.1	140.8
Embedded Derivative in Modified Coinsurance Arrangement
Other Liabilities
Derivative Liabilities	123.4	135.7
United States Government and Government Agencies and Authorities
Fixed Maturity Securities
Fixed Maturity Securities	1,249.6	1,304.4
States, Municipalities, and Political Subdivisions
Fixed Maturity Securities
Fixed Maturity Securities	1,556.4	1,591.6
Foreign Governments
Fixed Maturity Securities
Fixed Maturity Securities	1,411.8	1,376.7
Public Utilities
Fixed Maturity Securities
Fixed Maturity Securities	10,440.9	10,633.3
Mortgage/Asset-backed Securities
Fixed Maturity Securities
Fixed Maturity Securities	2,842.3	2,973.2
All Other Corporate Bonds
Fixed Maturity Securities
Fixed Maturity Securities	24,865.8	24,550.1
Redeemable Preferred Stocks
Fixed Maturity Securities
Fixed Maturity Securities	44.4	57.4
Fair Value, Inputs, Level 1 [Member]
Fixed Maturity Securities
Fixed Maturity Securities	6,226.5	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	118.7	326.6
Fair Value, Inputs, Level 1 [Member] | States, Municipalities, and Political Subdivisions
Fixed Maturity Securities
Fixed Maturity Securities	32.4	107.3
Fair Value, Inputs, Level 1 [Member] | Foreign Governments
Fixed Maturity Securities
Fixed Maturity Securities	0	0
Fair Value, Inputs, Level 1 [Member] | Public Utilities
Fixed Maturity Securities
Fixed Maturity Securities	1,041.5	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	5,033.9	3,469.5
Fair Value, Inputs, Level 1 [Member] | Redeemable Preferred Stocks
Fixed Maturity Securities
Fixed Maturity Securities	0	0
Fair Value, Inputs, Level 2 [Member]
Fixed Maturity Securities
Fixed Maturity Securities	34,785.2	36,723.9
Other Long-term Investments
Derivative Assets	111.9	137.7
Equity Securities	8.1	0
Other Liabilities
Derivative Liabilities	174.3	173.7
Fair Value, Inputs, Level 2 [Member] | Interest Rate Swap [Member]
Other Long-term Investments
Derivative Assets	109.0	134.2
Other Liabilities
Derivative Liabilities	31.2	32.9
Fair Value, Inputs, Level 2 [Member] | Foreign Exchange Contracts
Other Long-term Investments
Derivative Assets	2.9	3.5
Other Liabilities
Derivative Liabilities	143.1	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	1,130.9	977.8
Fair Value, Inputs, Level 2 [Member] | States, Municipalities, and Political Subdivisions
Fixed Maturity Securities
Fixed Maturity Securities	1,457.6	1,416.2
Fair Value, Inputs, Level 2 [Member] | Foreign Governments
Fixed Maturity Securities
Fixed Maturity Securities	1,411.8	1,376.7
Fair Value, Inputs, Level 2 [Member] | Public Utilities
Fixed Maturity Securities
Fixed Maturity Securities	8,851.1	9,576.4
Fair Value, Inputs, Level 2 [Member] | Mortgage/Asset-backed Securities
Fixed Maturity Securities
Fixed Maturity Securities	2,821.0	2,941.5
Fair Value, Inputs, Level 2 [Member] | All Other Corporate Bonds
Fixed Maturity Securities
Fixed Maturity Securities	19,098.7	20,415.1
Fair Value, Inputs, Level 2 [Member] | Redeemable Preferred Stocks
Fixed Maturity Securities
Fixed Maturity Securities	14.1	20.2
Fair Value, Inputs, Level 3 [Member]
Fixed Maturity Securities
Fixed Maturity Securities	1,399.5	1,141.4
Other Long-term Investments
Derivative Assets	0	0
Equity Securities	4.5	11.2
Other Liabilities
Derivative Liabilities	123.4	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	123.4	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	66.4	68.1
Fair Value, Inputs, Level 3 [Member] | Foreign Governments
Fixed Maturity Securities
Fixed Maturity Securities	0	0
Fair Value, Inputs, Level 3 [Member] | Public Utilities
Fixed Maturity Securities
Fixed Maturity Securities	548.3	338.9
Fair Value, Inputs, Level 3 [Member] | Mortgage/Asset-backed Securities
Fixed Maturity Securities
Fixed Maturity Securities	21.3	31.7
Fair Value, Inputs, Level 3 [Member] | All Other Corporate Bonds
Fixed Maturity Securities
Fixed Maturity Securities	733.2	665.5
Fair Value, Inputs, Level 3 [Member] | Redeemable Preferred Stocks
Fixed Maturity Securities
Fixed Maturity Securities	$ 30.3	$ 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
	Mar. 31, 2012	Mar. 31, 2011
Fixed Maturity Securities
Level 1 from Level 2	$ 3,869.0	$ 3,991.3
Level 2 from Level 1	2,386.9	2,297.5
United States Government and Government Agencies and Authorities
Fixed Maturity Securities
Level 1 from Level 2	0	16.1
Level 2 from Level 1	204.2	0
States, Municipalities, and Political Subdivisions
Fixed Maturity Securities
Level 1 from Level 2	0	25.4
Level 2 from Level 1	43.8	274.9
Foreign Governments
Fixed Maturity Securities
Level 1 from Level 2	0	0
Level 2 from Level 1	0	0.7
Public Utilities
Fixed Maturity Securities
Level 1 from Level 2	826.2	885.5
Level 2 from Level 1	454.4	481.1
All Other Corporate Bonds
Fixed Maturity Securities
Level 1 from Level 2	3,042.8	3,064.3
Level 2 from Level 1	$ 1,684.5	$ 1,540.8

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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Parenthetical) (Retained Earnings, USD $)	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Retained Earnings
Dividends to Stockholders, per common share	$ 0.0105	$ 0.0925

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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
	Mar. 31, 2012	Mar. 31, 2011
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning of Year	$ 1,141.4	$ 1,025.7
Earnings	(1.0)	(0.2)
Other Comprehensive Income or Loss	8.2	(1.8)
Purchases	12.0	23.7
Sales	(55.5)	(5.8)
Level 3 Transfers Into	656.1	438.1
Level 3 Transfers Out of	(361.7)	(488.9)
End of Year	1,399.5	990.8
States, Municipalities, and Political Subdivisions
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning of Year	68.1
Earnings	0
Other Comprehensive Income or Loss	(3.2)
Purchases	0
Sales	0
Level 3 Transfers Into	9.9
Level 3 Transfers Out of	(8.4)
End of Year	66.4
Public Utilities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning of Year	338.9	173.6
Earnings	0	0
Other Comprehensive Income or Loss	(0.1)	(0.7)
Purchases	0	7.0
Sales	(0.9)	(0.3)
Level 3 Transfers Into	416.9	249.7
Level 3 Transfers Out of	(206.5)	(104.6)
End of Year	548.3	324.7
Mortgage/Asset-backed Securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning of Year	31.7	0.7
Earnings	0	0
Other Comprehensive Income or Loss	2.4	(1.6)
Purchases	0	0
Sales	0	(2.2)
Level 3 Transfers Into	0	35.3
Level 3 Transfers Out of	(12.8)	0
End of Year	21.3	32.2
All Other Corporate Bonds
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning of Year	665.5	829.7
Earnings	0	(0.2)
Other Comprehensive Income or Loss	7.0	0.5
Purchases	12.0	16.7
Sales	(40.3)	(3.3)
Level 3 Transfers Into	223.0	153.1
Level 3 Transfers Out of	(134.0)	(362.7)
End of Year	733.2	633.8
Redeemable Preferred Stocks
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning of Year	37.2	21.7
Earnings	(1.0)	0
Other Comprehensive Income or Loss	2.1	0
Purchases	0	0
Sales	(14.3)	0
Level 3 Transfers Into	6.3	0
Level 3 Transfers Out of	0	(21.6)
End of Year	30.3	0.1
Equity Securites
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning of Year	11.2	1.5
Earnings	0	0
Other Comprehensive Income or Loss	0	0
Purchases	0	0
Sales	0	0
Level 3 Transfers Into	0	0
Level 3 Transfers Out of	(6.7)	0
End of Year	4.5	1.5
Embedded Derivative in Modified Coinsurance Arrangement
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning of Year	(135.7)	(96.3)
Earnings	12.3	14.1
Other Comprehensive Income or Loss	0	0
Purchases	0	0
Sales	0	0
Level 3 Transfers Into	0	0
Level 3 Transfers Out of	0	0
End of Year	$ (123.4)	$ (82.2)

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Mortgage Loans by Geographic Region (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans	$ 1,615.9	$ 1,612.3
Percent of Total	100.00%	100.00%
New England
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans	145.8	147.0
Percent of Total	9.00%	9.10%
Mid-Atlantic
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans	172.5	174.1
Percent of Total	10.70%	10.80%
East North Central
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans	211.3	212.7
Percent of Total	13.10%	13.20%
West North Central
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans	149.9	151.2
Percent of Total	9.30%	9.40%
South Atlantic
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans	397.5	383.8
Percent of Total	24.60%	23.80%
East South Central
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans	52.1	52.4
Percent of Total	3.20%	3.30%
West South Central
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans	158.8	160.4
Percent of Total	9.80%	9.90%
Mountain
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans	69.0	69.5
Percent of Total	4.30%	4.30%
Pacific
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans	$ 259.0	$ 261.2
Percent of Total	16.00%	16.20%

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Derivative Financial Instruments - Additional Information (Detail) (USD $)	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Dec. 31, 2011
Derivative [Line Items]
Current credit exposure on derivatives	$ 8,700,000
Cash collateral from counterparties	42,600,000		45,600,000
Carrying value of fixed maturity securities posted as collateral to our counterparties	135,100,000		114,900,000
Cash Collateral to counterparties	0		0
Aggregate fair value of all derivative instruments with credit risk-related contingent features in a liability position	174,300,000		173,700,000
Notional amount of foreign currency cash flow hedges	550,100,000		554,000,000
Notional Value	290,000,000		335,000,000
Approximate amount of net deferred gains on derivative instruments expected to be amortized during the next twelve months	36,200,000
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net	0.0	0
Forward Contracts [Member]
Derivative [Line Items]
Gain (Loss) on Sale of Derivatives	100,000
Interest Rate Contract [Member]
Derivative [Line Items]
Notional Value	35,000,000	19,900,000
Receive Variable/Pay Fixed | Swaps
Derivative [Line Items]
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
Hedged benchmark interest rate, on the related interest rate swaps	1,700,000	2,600,000
Receive Fixed/Pay Variable | Swaps
Derivative [Line Items]
Hedged benchmark interest rate, on the related interest rate swaps		2,100,000
Notional Amount of Fair Value Hedge Instruments	$ 350,000,000		$ 350,000,000

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CONSOLIDATED BALANCE SHEETS (USD $) In Millions, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Investments
Fixed Maturity Securities - at fair value (amortized cost: $36,888.0; $36,640.7)	$ 42,411.2	$ 42,486.7
Mortgage Loans	1,615.9	1,612.3
Policy Loans	3,049.0	3,051.4
Other Long-term Investments	635.5	639.2
Short-term Investments	1,441.2	1,423.5
Total Investments	49,152.8	49,213.1
Other Assets
Cash and Bank Deposits	102.5	116.6
Accounts and Premiums Receivable	1,713.8	1,672.2
Reinsurance Recoverable	4,824.4	4,854.6
Accrued Investment Income	736.9	681.8
Deferred Acquisition Costs	1,699.7	1,677.1
Goodwill	201.5	201.2
Property and Equipment	497.4	493.3
Other Assets	642.8	645.3
Total Assets	59,571.8	59,555.2
Liabilities
Policy and Contract Benefits	1,470.5	1,494.0
Reserves for Future Policy and Contract Benefits	42,965.5	43,051.9
Unearned Premiums	490.4	433.2
Other Policyholders' Funds	1,638.4	1,625.9
Income Tax Payable	98.4	38.2
Deferred Income Tax	88.9	44.7
Short-term Debt	372.2	312.3
Long-term Debt	2,552.8	2,570.2
Other Liabilities	1,714.8	1,815.1
Total Liabilities	51,391.9	51,385.5
Commitments and Contingent Liabilities - Note 9
Stockholders' Equity
Common Stock, $0.10 par, Authorized: 725,000,000 shares Issued: 359,304,646 and 358,691,567 shares	35.9	35.9
Additional Paid-in Capital	2,600.4	2,591.1
Accumulated Other Comprehensive Income (Loss)
Net Unrealized Gain on Securities Not Other-Than-Temporarily Impaired	584.4	614.8
Net Gain on Cash Flow Hedges	398.0	408.7
Foreign Currency Translation Adjustment	(89.4)	(117.6)
Unrecognized Pension and Postretirement Benefit Costs	(437.6)	(444.1)
Retained Earnings	6,793.5	6,611.0
Treasury Stock - at cost: 73,492,245 shares and 65,975,613 shares	(1,705.3)	(1,530.1)
Total Stockholders' Equity	8,179.9	8,169.7
Total Liabilities and Stockholders' Equity	$ 59,571.8	$ 59,555.2

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Investments Mortgage Loan Restructuring (Detail) (Commercial Real Estate Portfolio Segment [Member], USD $) In Millions, unless otherwise specified	Mar. 31, 2012	Mar. 31, 2011
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Carrying Amount	$ 4.2	$ 9.8
Number of Loans	1	1

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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Change in Net Unrealized Gains and Losses on Securities Not Other-Than-Temporarily Impaired, tax benefit	$ 110.2	$ 40.7
Change in Net Unrealized Gains and Losses on Securities Other-Than-Temporarily Impaired, tax benefit	0	1.1
Total Change in Net Unrealized Gain on Securities Before Reclassification Adjustment, tax benefit	110.2	41.8
Reclassification Adjustment for Net Realized Investment (Gain) Loss, tax expense	0.3	0.5
Change in Net Gain on Cash Flow Hedges, tax benefit	5.9	5.4
Change in Adjustment to Reserves for Future Policy and Contract Benefits Net of Reinsurance and Other, tax expense	97.2	59.8
Change in Unrecognized Pension and Postretirement Benefit Costs, tax expense	$ 3.0	$ 1.6

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Pensions and Other Postretirement Benefits - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012
United Kingdom, Pounds
Pension and Other Postretirement Benefits Disclosure [Line Items]
Pension Contributions	$ 0.7
Pension Benefits, Non U.S. Plans
Pension and Other Postretirement Benefits Disclosure [Line Items]
Defined Benefit Plan, Contributions by Employer	$ 1.1

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Amortized Cost and Fair Values of Securities by Security Type (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	$ 36,888.0	$ 36,640.7
Gross Unrealized Gain	5,680.6	6,068.2
Gross Unrealized Loss	157.4	222.2
Fixed Maturity Securities	42,411.2	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 Basis	997.1	1,005.8
Gross Unrealized Gain	254.5	299.7
Gross Unrealized Loss	2.0	1.1
Fixed Maturity Securities	1,249.6	1,304.4
States, Municipalities, and Political Subdivisions
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	1,341.1	1,377.8
Gross Unrealized Gain	226.5	222.6
Gross Unrealized Loss	11.2	8.8
Fixed Maturity Securities	1,556.4	1,591.6
Foreign Governments
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	1,185.3	1,139.4
Gross Unrealized Gain	226.5	237.3
Gross Unrealized Loss	0	0
Fixed Maturity Securities	1,411.8	1,376.7
Public Utilities
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	9,026.0	9,015.7
Gross Unrealized Gain	1,451.0	1,646.2
Gross Unrealized Loss	36.1	28.6
Fixed Maturity Securities	10,440.9	10,633.3
Mortgage/Asset-backed Securities
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	2,504.4	2,634.6
Gross Unrealized Gain	338.8	344.1
Gross Unrealized Loss	0.9	5.5
Fixed Maturity Securities	2,842.3	2,973.2
All Other Corporate Bonds
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	21,793.6	21,411.6
Gross Unrealized Gain	3,178.8	3,314.8
Gross Unrealized Loss	106.6	176.3
Fixed Maturity Securities	24,865.8	24,550.1
Redeemable Preferred Stocks
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	40.5	55.8
Gross Unrealized Gain	4.5	3.5
Gross Unrealized Loss	0.6	1.9
Fixed Maturity Securities	$ 44.4	$ 57.4

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Investments (Tables)

3 Months Ended

Mar. 31, 2012

Notes to Financial Statements [Abstract]

Schedule of Available-for-sale Securities Reconciliation

At March 31, 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.

	March 31, 2012
	(in millions of dollars)
	Amortized Cost		Gross Unrealized Gain		Gross Unrealized Loss		Fair Value
United States Government and Government Agencies and Authorities	$	997.1	$	254.5	$	2.0	$	1,249.6
States, Municipalities, and Political Subdivisions	1,341.1		226.5		11.2		1,556.4
Foreign Governments	1,185.3		226.5		—		1,411.8
Public Utilities	9,026.0		1,451.0		36.1		10,440.9
Mortgage/Asset-Backed Securities	2,504.4		338.8		0.9		2,842.3
All Other Corporate Bonds	21,793.6		3,178.8		106.6		24,865.8
Redeemable Preferred Stocks	40.5		4.5		0.6		44.4
Total Fixed Maturity Securities	$	36,888.0	$	5,680.6	$	157.4	$	42,411.2

	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 March 31, 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.

	March 31, 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	$	8.9	$	0.2	$	5.6	$	1.8
States, Municipalities, and Political Subdivisions	68.7		3.8		74.8		7.4
Public Utilities	229.4		19.0		128.9		17.1
Mortgage/Asset-Backed Securities	38.6		0.3		9.0		0.6
All Other Corporate Bonds	1,253.4		39.9		590.1		66.7
Redeemable Preferred Stocks	—		—		6.9		0.6
Total Fixed Maturity Securities	$	1,599.0	$	63.2	$	815.3	$	94.2

	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.

	March 31, 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	$	617.5	$	17.3	$	629.8	$	—	$	5.0
Over 1 year through 5 years	5,281.0		496.2		5,428.0		6.2		343.0
Over 5 years through 10 years	9,659.8		1,315.4		10,269.9		34.5		670.8
Over 10 years	18,825.3		3,512.9		20,874.5		115.8		1,347.9
	34,383.6		5,341.8		37,202.2		156.5		2,366.7
Mortgage/Asset-Backed Securities	2,504.4		338.8		2,794.7		0.9		47.6
Total Fixed Maturity Securities	$	36,888.0	$	5,680.6	$	39,996.9	$	157.4	$	2,414.3

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. We held no fixed maturity securities as of the beginning of 2012 or at the end of the first quarter of 2012 for which a portion of an other-than-temporary impairment was previously recognized in other comprehensive income.

	Three Months Ended
	March 31, 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:

	March 31, 2012				December 31, 2011
	Carrying		Percent of		Carrying		Percent of
	Amount		Total		Amount		Total
	(in millions of dollars)
Property Type
Apartment	$	27.8	1.7	%	$	28.0	1.8	%
Industrial	504.5		31.2		502.0		31.1
Mixed	93.0		5.8		93.5		5.8
Office	663.8		41.1		659.3		40.9
Retail	319.8		19.8		322.4		20.0
Other	7.0		0.4		7.1		0.4
Total	$	1,615.9	100.0	%	$	1,612.3	100.0	%

Mortgage Loans by Geographic Region

Region
New England	$	145.8	9.0	%	$	147.0	9.1	%
Mid-Atlantic	172.5		10.7		174.1		10.8
East North Central	211.3		13.1		212.7		13.2
West North Central	149.9		9.3		151.2		9.4
South Atlantic	397.5		24.6		383.8		23.8
East South Central	52.1		3.2		52.4		3.3
West South Central	158.8		9.8		160.4		9.9
Mountain	69.0		4.3		69.5		4.3
Pacific	259.0		16.0		261.2		16.2
Total	$	1,615.9	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:

	March 31		December 31
	2012		2011
	(in millions of dollars)
Internal Rating
Aa	$	13.9	$	10.9
A	690.7		712.6
Baa	878.1		855.0
Ba	20.1		20.7
B	13.1		13.1
Total	$	1,615.9	$	1,612.3

Mortgage Loans by Applicable Credit Quality Indicators Loan to Value Ratio

Loan-to-Value Ratio
<= 65%	$	614.7	$	578.4
> 65% <= 75%	778.3		802.3
> 75% <= 85%	171.6		165.1
> 85% <= 100%	51.3		66.5
Total	$	1,615.9	$	1,612.3

Activity in the Allowance for Credit Losses

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

	Three Months Ended March 31
	2012		2011
	(in millions of dollars)
Balance at Beginning of Year	$	1.5	$	1.5
Provision	0.5		—
Balance at End of Period	$	2.0	$	1.5

Impaired Mortgage Loans

Impaired mortgage loans are as follows:

	March 31, 2012
	(in millions of dollars)
			Unpaid
	Recorded		Principal		Related
	Investment		Balance		Allowance
With an Allowance Recorded	$	22.0	$	24.0	$	2.0
	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

Our troubled debt restructurings during the three months ended March 31, 2012 and 2011 were comprised entirely of loan foreclosures. A summary of our troubled debt restructurings is as follows:

	Three Months Ended March 31
	2012		2011
	(in millions of dollars)
Foreclosure
Carrying Amount	$	4.2	$	9.8
Number of Loans	1		1

We had no realized losses on loan foreclosures for the three months ended March 31, 2012 and 2011

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 March 31
	2012			2011
	(in millions of dollars)
Fixed Maturity Securities
Gross Gains on Sales	$	5.9		$	9.5
Gross Losses on Sales	(5.0		)	(6.9		)
Other-Than-Temporary Impairment Loss	—			(2.3		)
Mortgage Loans and Other Invested Assets
Gross Gains on Sales	—			1.2
Impairment Loss	(0.5		)	—
Embedded Derivative in Modified Coinsurance Arrangement	12.3			14.1
Foreign Currency Transactions	(0.3		)	(0.4		)
Net Realized Investment Gain	$	12.4		$	15.2

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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	Mar. 31, 2012	Dec. 31, 2011
Schedule of Available-for-sale Securities [Line Items]
Less Than 12 Months Fair Value	$ 1,599.0	$ 2,041.7
Less than 12 Months Gross Unrealized Loss	63.2	79.5
12 Months or Greater Fair Value	815.3	949.2
12 Months or Greater Gross Unrealized Loss	94.2	142.7
United States Government and Government Agencies and Authorities
Schedule of Available-for-sale Securities [Line Items]
Less Than 12 Months Fair Value	8.9	0
Less than 12 Months Gross Unrealized Loss	0.2	0
12 Months or Greater Fair Value	5.6	6.3
12 Months or Greater Gross Unrealized Loss	1.8	1.1
States, Municipalities, and Political Subdivisions
Schedule of Available-for-sale Securities [Line Items]
Less Than 12 Months Fair Value	68.7	51.6
Less than 12 Months Gross Unrealized Loss	3.8	1.3
12 Months or Greater Fair Value	74.8	75.3
12 Months or Greater Gross Unrealized Loss	7.4	7.5
Public Utilities
Schedule of Available-for-sale Securities [Line Items]
Less Than 12 Months Fair Value	229.4	192.0
Less than 12 Months Gross Unrealized Loss	19.0	7.9
12 Months or Greater Fair Value	128.9	142.2
12 Months or Greater Gross Unrealized Loss	17.1	20.7
Mortgage/Asset-backed Securities
Schedule of Available-for-sale Securities [Line Items]
Less Than 12 Months Fair Value	38.6	94.2
Less than 12 Months Gross Unrealized Loss	0.3	4.8
12 Months or Greater Fair Value	9.0	19.6
12 Months or Greater Gross Unrealized Loss	0.6	0.7
All Other Corporate Bonds
Schedule of Available-for-sale Securities [Line Items]
Less Than 12 Months Fair Value	1,253.4	1,703.9
Less than 12 Months Gross Unrealized Loss	39.9	65.5
12 Months or Greater Fair Value	590.1	684.9
12 Months or Greater Gross Unrealized Loss	66.7	110.8
Redeemable Preferred Stocks
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	6.9	20.9
12 Months or Greater Gross Unrealized Loss	$ 0.6	$ 1.9

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Segment Information (Tables)

3 Months Ended

Mar. 31, 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 March 31
	2012			2011
	(in millions of dollars)
Operating Revenue by Segment	$	2,598.9		$	2,547.9
Net Realized Investment Gain	12.4			15.2
Revenue	$	2,611.3		$	2,563.1
Operating Income by Segment	$	309.2		$	320.2
Net Realized Investment Gain	12.4			15.2
Non-operating Retirement-related Loss	(11.6		)	(8.0		)
Income Tax	(96.1		)	(103.8		)
Net Income	$	213.9		$	223.6

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 March 31
	2012		2011
	(in millions of dollars)
Unum US
Group Disability
Group Long-term Disability	$	395.5	$	397.0
Group Short-term Disability	117.7		111.0
Group Life and Accidental Death & Dismemberment
Group Life	293.6		273.4
Accidental Death & Dismemberment	28.3		27.1
Supplemental and Voluntary
Individual Disability - Recently Issued	118.4		115.1
Voluntary Benefits	158.5		145.2
	1,112.0		1,068.8
Unum UK
Group Long-term Disability	101.9		103.4
Group Life	52.7		47.6
Supplemental and Voluntary	16.1		16.1
	170.7		167.1
Colonial Life
Accident, Sickness, and Disability	180.2		172.3
Life	51.7		46.2
Cancer and Critical Illness	64.4		61.9
	296.3		280.4
Closed Block
Individual Disability	187.2		202.3
Long-term Care	155.2		150.6
All Other	0.5		0.3
	342.9		353.2
Total	$	1,921.9	$	1,869.5

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 March 31, 2012
Premium Income	$	1,112.0	$	170.7	$	296.3	$	342.9	$	—		$	1,921.9
Net Investment Income	238.6		36.5		35.6		301.6		7.2			619.5
Other Income	31.1		0.1		0.1		25.9		0.3			57.5
Operating Revenue	$	1,381.7	$	207.3	$	332.0	$	670.4	$	7.5		$	2,598.9
Operating Income (Loss)	$	205.9	$	38.8	$	69.7	$	15.4	$	(20.6	)	$	309.2
Three Months Ended March 31, 2011
Premium Income	$	1,068.8	$	167.1	$	280.4	$	353.2	$	—		$	1,869.5
Net Investment Income	233.7		44.9		31.3		294.3		14.5			618.7
Other Income	31.0		0.1		0.1		27.5		1.0			59.7
Operating Revenue	$	1,333.5	$	212.1	$	311.8	$	675.0	$	15.5		$	2,547.9
Operating Income (Loss)	$	194.7	$	48.9	$	66.5	$	31.9	$	(21.8	)	$	320.2

Assets by Segment

Assets by segment are as follows:

	March 31		December 31
	2012		2011
	(in millions of dollars)
Unum US	$	18,621.5	$	18,583.6
Unum UK	3,746.8		3,549.5
Colonial Life	3,209.3		3,167.8
Closed Block	31,306.2		31,439.5
Corporate	2,688.0		2,814.8
Total	$	59,571.8	$	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	12.2
Retirement of Repurchased Common Shares		(0.8)	(55.2)		(144.0)
All Other Changes During Year	54.9			54.9
Net Income	223.6				223.6
Dividends to Stockholders (per common share: $0.1050; $0.0925)					(29.9)
Purchases of Treasury Stock	(200.0)					(23.6)
Balance at End of Period at Mar. 31, 2011	8,522.2	35.8	2,572.4	406.3	6,641.5	(1,133.8)
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	9.3
Retirement of Repurchased Common Shares		0	0		0
All Other Changes During Year	(6.4)			(6.4)
Net Income	213.9
Dividends to Stockholders (per common share: $0.1050; $0.0925)					(31.4)
Purchases of Treasury Stock	(175.2)					(175.2)
Balance at End of Period at Mar. 31, 2012	$ 8,179.9	$ 35.9	$ 2,600.4	$ 455.4	$ 6,793.5	$ (1,705.3)

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CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Millions, except Share data, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Investments [Abstract]
Fixed Maturity Securities, Amortized Cost	$ 36,888.0	$ 36,640.7
Stockholders' Equity
Common Stock, Par	$ 0.10	$ 0.10
Common Stock, Authorized	725,000,000	725,000,000
Common Stock, Issued	359,304,646	358,691,567
Treasury Stock, Shares	73,492,245	65,975,613

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Stockholders' Equity and Earnings Per Common Share

3 Months Ended

Mar. 31, 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 March 31
	2012		2011
	(in millions of dollars, except share data)
Numerator
Net Income	$	213.9	$	223.6
Denominator (000s)
Weighted Average Common Shares - Basic	290,429.5		312,742.3
Dilution for Assumed Exercises of Stock Options and Nonvested Stock Awards	854.5		1,590.0
Weighted Average Common Shares - Assuming Dilution	291,284.0		314,332.3
Net Income Per Common Share
Basic	$	0.74	$	0.72
Assuming Dilution	$	0.73	$	0.71

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 $11.37 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 2.2 million and 1.9 million shares of common stock for the three month periods ended March 31, 2012 and 2011, respectively.

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 has an expiration date of 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 months ended March 31, 2012, we repurchased an additional 7.5 million shares on the open market at a cost of $175.2 million, including commissions of $0.2 million. The dollar value of shares remaining under the $1.0 billion repurchase program was $349.7 million at March 31, 2012. 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 (USD $) In Billions, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Feb. 22, 2012	Jun. 30, 2011
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2012
Document Fiscal Year Focus	2012
Document Fiscal Period Focus	Q1
Trading Symbol	UNM
Entity Registrant Name	Unum Group
Entity Central Index Key	0000005513
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		285,849,395
Entity Public Float			$ 7.7

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Commitments and Contingent Liabilities

3 Months Ended

Mar. 31, 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.

Broker Compensation and Quoting Process

We and certain of our subsidiaries, along with many other insurance brokers and insurers, were named as defendants in a series of putative class actions that were transferred to the U.S. District Court for the District ofNew Jersey for coordinated or consolidated pretrial proceedings as part of multidistrict litigation (MDL) No. 1663, In re Insurance Brokerage Antitrust Litigation. The plaintiffs in MDL No. 1663 were ordered to file a consolidated amended complaint which alleged, among other things, that the defendants violated federal and state antitrust laws, the Racketeer Influenced Corrupt Organizations Act (RICO), Employee Retirement Income Security Act (ERISA), and various state common law requirements by engaging in alleged bid rigging and customer allocation and by paying undisclosed compensation to insurance brokers to steer business to defendant insurers. After several amendments to the complaint, all claims against us were dismissed, and the dismissal was affirmed on appeal by the United States Court of Appeals for the Third Circuit.

The only remaining proceeding against us that is part of MDL No. 1663 is Palm Tree Computers Systems, Inc. v. ACE USA, et al., which was filed in the Florida state Circuit Court on February 16, 2005. The complaint contains allegations similar to those referred to above. The case was removed to federal court and, on October 20, 2005, the case was transferred to MDL No. 1663. Plaintiffs renewed a motion to remand the case to the state court in Florida, and that motion was denied without prejudice on October 16, 2009. There have been no further proceedings in this case subsequent to that date, while the Court considers motions to dismiss filed by other defendants in MDL No. 1663.

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. This decision has been appealed to the United States District Court for the Southern District of New York.

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.

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.

In 2009, a Pennsylvania-based insurance company and its affiliates were ordered into rehabilitation, and the Pennsylvania Insurance Commissioner, who was appointed as the Rehabilitator, filed petitions for liquidation with the Commonwealth Court of Pennsylvania. Under Pennsylvania legislation, payment of covered claims and other related insurance obligations are provided, within prescribed limits, by state guaranty funds. These guaranty funds assess fees on insurance companies that sell insurance within the state, which are generally based on a company's pro rata portion of premiums written or received prior to the insolvency. Under Pennsylvania statutes, an insurer is declared insolvent only after it is placed under an order of liquidation by a court of competent jurisdiction with a finding for insolvency. If and when the formal order of liquidation is issued, we would then be subject to an assessment and would record a contingent liability net of any recoverable premium tax offsets. We do not believe our exposure to potential assessment is material to our consolidated financial position or results of operations.

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
	Mar. 31, 2012	Mar. 31, 2011
Revenue
Premium Income	$ 1,921.9	$ 1,869.5
Net Investment Income	619.5	618.7
Realized Investment Gain (Loss)
Other-Than-Temporary Impairment Loss on Fixed Maturity Securities	0	(2.3)
Other Net Realized Investment Gain	12.4	17.5
Net Realized Investment Gain	12.4	15.2
Other Income	57.5	59.7
Total Revenue	2,611.3	2,563.1
Benefits and Expenses
Benefits and Change in Reserves for Future Benefits	1,662.9	1,593.0
Commissions	232.3	224.3
Interest and Debt Expense	35.5	37.9
Deferral of Acquisition Costs	(117.4)	(112.2)
Amortization of Deferred Acquisition Costs	99.4	95.0
Compensation Expense	206.9	201.9
Other Expenses	181.7	195.8
Total Benefits and Expenses	2,301.3	2,235.7
Income Before Income Tax	310.0	327.4
Income Tax
Current	37.3	65.3
Deferred	58.8	38.5
Total Income Tax	96.1	103.8
Net Income	$ 213.9	$ 223.6
Net Income Per Common Share
Earnings Per Share, Basic	$ 0.74	$ 0.72
Earnings Per Share, Assuming Dilution	$ 0.73	$ 0.71

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Fair Values of Financial Instruments

3 Months Ended

Mar. 31, 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.

	March 31, 2012				December 31, 2011
	Carrying Amount		Fair Value		Carrying Amount		Fair Value
	(in millions of dollars)
Assets
Fixed Maturity Securities	$	42,411.2	$	42,411.2	$	42,486.7	$	42,486.7
Mortgage Loans	1,615.9		1,792.1		1,612.3		1,789.8
Policy Loans	3,049.0		3,115.4		3,051.4		3,124.4
Other Long-term Investments
Derivatives	111.9		111.9		137.7		137.7
Equity Securities	12.6		12.6		11.2		11.2
Miscellaneous Long-term Investments	452.8		452.8		436.4		436.4
Liabilities
Policyholders' Funds
Deferred Annuity Products	$	641.1	$	641.1	$	641.1	$	641.1
Supplementary Contracts without Life Contingencies	508.7		508.7		502.6		502.6
Long-term Debt	2,552.8		2,585.8		2,570.2		2,540.2
Other Liabilities
Derivatives	174.3		174.3		173.7		173.7
Embedded Derivative in Modified Coinsurance Arrangement	123.4		123.4		135.7		135.7
Unfunded Commitments to Investment Partnerships	152.0		152.0		160.6		160.6

Note 3 - Fair Values of Financial Instruments - Continued

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.

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 $2,834.9 million and $2,838.3 million as of March 31, 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 $1,170.2 million at March 31, 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 $1,143.3 million at March 31, 2012 and are assigned a Level 2. Debt instruments which are valued using discounted cash flow analyses have a fair value of $2.3 million at March 31, 2012 and are assigned a Level 3.

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

Note 3 - Fair Values of Financial Instruments - Continued

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.

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 March 31, 2012, approximately 14.7 percent of our fixed maturity securities were valued using active trades from TRACE pricing or broker market maker prices for which there was current market activity in that specific security (comparable to receiving one binding quote).  The prices obtained were not adjusted, and the assets were classified as Level 1, the 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 85.3 percent of our fixed maturity securities were valued based on non-binding quotes or other observable and unobservable inputs, as discussed below.

• Approximately 67.1 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 4.9 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 13.3 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:

	March 31, 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	$	118.7	$	1,130.9	$	—	$	1,249.6
States, Municipalities, and Political Subdivisions	32.4		1,457.6		66.4		1,556.4
Foreign Governments	—		1,411.8		—		1,411.8
Public Utilities	1,041.5		8,851.1		548.3		10,440.9
Mortgage/Asset-Backed Securities	—		2,821.0		21.3		2,842.3
All Other Corporate Bonds	5,033.9		19,098.7		733.2		24,865.8
Redeemable Preferred Stocks	—		14.1		30.3		44.4
Total Fixed Maturity Securities	6,226.5		34,785.2		1,399.5		42,411.2
Other Long-term Investments
Derivatives
Interest Rate Swaps	—		109.0		—		109.0
Foreign Exchange Contracts	—		2.9		—		2.9
Total Derivatives	—		111.9		—		111.9
Equity Securities	—		8.1		4.5		12.6
Liabilities
Other Liabilities
Derivatives
Interest Rate Swaps	$	—	$	31.2	$	—	$	31.2
Foreign Exchange Contracts	—		143.1		—		143.1
Embedded Derivative in Modified Coinsurance Arrangement	—		—		123.4		123.4
Total Derivatives	—		174.3		123.4		297.7

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 March 31
	2012				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	$	—	$	204.2	$	16.1	$	—
States, Municipalities, and Political Subdivisions	—		43.8		25.4		274.9
Foreign Governments	—		—		—		0.7
Public Utilities	826.2		454.4		885.5		481.1
All Other Corporate Bonds	3,042.8		1,684.5		3,064.3		1,540.8
Total Fixed Maturity Securities	$	3,869.0	$	2,386.9	$	3,991.3	$	2,297.5

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 March 31, 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		$	—		$	(3.2	)	$	—	$	—		$	9.9	$	(8.4	)	$	66.4
Public Utilities	338.9			—			(0.1		)	—		(0.9		)	416.9		(206.5		)	548.3
Mortgage/Asset-Backed Securities	31.7			—			2.4			—		—			—		(12.8		)	21.3
All Other Corporate Bonds	665.5			—			7.0			12.0		(40.3		)	223.0		(134.0		)	733.2
Redeemable Preferred Stocks	37.2			(1.0		)	2.1			—		(14.3		)	6.3		—			30.3
Total Fixed Maturity Securities	1,141.4			(1.0		)	8.2			12.0		(55.5		)	656.1		(361.7		)	1,399.5
Equity Securities	11.2			—			—			—		—			—		(6.7		)	4.5
Embedded Derivative in Modified Coinsurance Arrangement	(135.7		)	12.3			—			—		—			—		—			(123.4		)
	Three Months Ended March 31, 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		$	—		$	(0.7	)	$	7.0	$	(0.3	)	$	249.7	$	(104.6	)	$	324.7
Mortgage/Asset-Backed Securities	0.7			—			(1.6		)	—		(2.2		)	35.3		—			32.2
All Other Corporate Bonds	829.7			(0.2		)	0.5			16.7		(3.3		)	153.1		(362.7		)	633.8
Redeemable Preferred Stocks	21.7			—			—			—		—			—		(21.6		)	0.1
Total Fixed Maturity Securities	1,025.7			(0.2		)	(1.8		)	23.7		(5.8		)	438.1		(488.9		)	990.8
Equity Securities	1.5			—			—			—		—			—		—			1.5
Embedded Derivative in Modified Coinsurance Arrangement	(96.3		)	14.1			—			—		—			—		—			(82.2		)

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 for the three months ended March 31, 2012 and 2011 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 $12.3 million and $14.1 million, respectively. 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.

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

	March 31, 2012
	(in millions of dollars)
	Fair Value			Unobservable Input		Range/Weighted Average
Fixed Maturity Securities
States, Municipalities, and Political Subdivisions - Private	$	66.4		- Comparability Adjustment - Discount for Size - Volatility of Credit	(b) (c) (e)	0.50% - 1.25%/0.87% 0.20% - 0.20%/0.20% 0.25% - 0.25%/0.25%
Mortgage/Asset-Backed Securities - Private	0.6			- Discount for Size	(c)	4.99% - 5.08%/5.06%
All Other Corporate Bonds - Private	295.6			- Change in Benchmark Reference - Comparability Adjustment - Discount for Size - Lack of Marketability - Volatility of Credit - Market Convention	(a) (b) (c) (d) (e) (f)	1.65% - 1.65%/1.65% 0.03% - 0.75%/0.50% 0.50% - 0.50%/0.50% 0.50% - 1.00%/0.74% (0.50)% - 7.72%/1.27% Priced at Par
All Other Corporate Bonds - Public	117.5			- Change in Benchmark Reference - Comparability Adjustment - Discount for Size	(a) (b) (c)	0.25% - 0.47%/0.27% 0.25% - 0.50%/0.41% 0.25% - 0.25%/0.25%
Equity Securities - Private	4.0			- Market Convention	(f)	Priced at Cost or Owner's Equity
Embedded Derivative in Modified Coinsurance Arrangement	(123.4		)	- 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 illiquidity

(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

3 Months Ended

Mar. 31, 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
	Accounting			As			Effect of
	Method			Adjusted			Change
	(in millions of dollars, except share data)
At or for the Three Months Ended March 31, 2011
Consolidated Balance Sheets
Deferred Acquisition Costs	$	2,542.9		$	1,834.6		$	(708.3	)
Deferred Income Tax	471.2			224.5			(246.7		)
Net Unrealized Gain on Securities Not Other-Than-Temporarily Impaired	443.6			449.3			5.7
Foreign Currency Translation Adjustment	(84.1		)	(80.6		)	3.5
Retained Earnings	7,112.3			6,641.5			(470.8		)
Consolidated Statements of Income
Deferral of Acquisition Costs	$	(158.3	)	$	(112.2	)	$	46.1
Amortization of Deferred Acquisition Costs	138.3			95.0			(43.3		)
Income Tax - Deferred	39.5			38.5			(1.0		)
Net Income	225.4			223.6			(1.8		)
Net Income Per Common Share
Basic	0.72			0.72			—
Assuming Dilution	0.72			0.71			(0.01		)
Consolidated Statements of Comprehensive Income
Net Income	$	225.4		$	223.6		$	(1.8	)
Change in Adjustment to Reserves for Future Policy and Contract Benefits, Net of Reinsurance and Other	113.2			113.2			—
Change in Foreign Currency Translation Adjustment	26.8			26.5			(0.3		)
Consolidated Statements of Cash Flows
Net Income	$	225.4		$	223.6		$	(1.8	)
Change in Deferred Acquisition Costs	(20.0		)	(17.2		)	2.8
Change in Income Taxes	83.0			82.0			(1.0		)
December 31, 2011
Consolidated Balance Sheets
Deferred Acquisition Costs	$	2,300.9		$	1,677.1		$	(623.8	)
Deferred Income Tax	261.2			44.7			(216.5		)
Net Unrealized Gain on Securities Not Other-Than-Temporarily Impaired	605.8			614.8			9.0
Foreign Currency Translation Adjustment	(121.5		)	(117.6		)	3.9
Retained Earnings	7,031.2			6,611.0			(420.2		)

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)

3 Months Ended

Mar. 31, 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 December 31, 2010	$	174.0	$	617.9	$	890.0	$	—	$	1,681.9
Additions	—		—		—		19.9		19.9
Terminations	—		11.0		55.0		19.9		85.9
Balance at March 31, 2011	$	174.0	$	606.9	$	835.0	$	—	$	1,615.9
Balance at December 31, 2011	$	174.0	$	554.0	$	685.0	$	—	$	1,413.0
Additions	—		—		—		35.0		35.0
Terminations	—		3.9		45.0		35.0		83.9
Balance at March 31, 2012	$	174.0	$	550.1	$	640.0	$	—	$	1,364.1

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 March 31, 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	$	140.0		$	150.0		$	290.0
Weighted Average Receive Rate	6.49		%	6.34		%	6.41		%
Weighted Average Pay Rate	0.47		%	0.47		%	0.47		%

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.

	March 31, 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	Other L-T Investments	$	109.0	Other Liabilities	$	31.2
Foreign Exchange Contracts	Other L-T Investments	2.9		Other Liabilities	143.1
Total		$	111.9		$	174.3
Not Designated as Hedging Instruments
Embedded Derivative in Modified Coinsurance Arrangement				Other Liabilities	$	123.4

	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 March 31, 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	$	18.3		$	9.1		(1)
Interest Rate Swaps	—			0.1			(2)
Interest Rate Swaps	—			(0.4		)	(3)
Foreign Exchange Contracts	—			(0.2		)	(1)
Foreign Exchange Contracts	(2.9		)	(12.4		)	(2)
Total	$	15.4		$	(3.8	)

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

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

(3) Loss recognized in interest and debt expense

	Three Months Ended March 31, 2011
	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	$	14.6		$	8.4		(1)
Interest Rate Swaps	—			1.2			(2)
Interest Rate Swaps	—			(0.4		)	(3)
Foreign Exchange Contracts	—			(0.3		)	(1)
Foreign Exchange Contracts	(7.9		)	(18.5		)	(2)
Total	$	6.7		$	(9.6	)

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

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

(3) Loss recognized in interest and debt expense

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

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

	Three Months Ended March 31
	2012		2011
	(in millions of dollars)
Gain Recognized in Net Realized Investment Gain	$	12.3	$	14.1

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Other

3 Months Ended

Mar. 31, 2012

Other [Abstract]

Other Items Disclosure

Debt

At March 31, 2012, short-term debt consisted of $372.2 million of securities lending transactions. Regarding activity relative to our long-term debt, during the three months ended March 31, 2012, we made principal payments of $15.0 million and $2.5 million on our senior secured non-recourse floating rate notes issued by Northwind Holdings, LLC and Tailwind Holdings, LLC, respectively.

Income Tax

At March 31, 2012, we had a liability of $82.5 million for unrecognized tax benefits, all of which is associated with deferred tax assets. The interest expense and penalties related to unrecognized tax expense in our consolidated statements of income was $0.5 million and $1.2 million for the three months ended March 31, 2012 and 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, it is reasonably possible that this appeal will be resolved in whole or in part within 12 months and that statutes of limitations may expire in multiple jurisdictions within the same period.  As a result, it is reasonably possible that our liability for unrecognized tax benefits could decrease within 12 months by $0 million to $66.0 million.  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.

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Segment Information

3 Months Ended

Mar. 31, 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. A long-term focus is necessary to maintain profitability over the life of the business, although we may experience realized investment losses which will affect future earnings levels 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 March 31
	2012			2011
	(in millions of dollars)
Operating Revenue by Segment	$	2,598.9		$	2,547.9
Net Realized Investment Gain	12.4			15.2
Revenue	$	2,611.3		$	2,563.1
Operating Income by Segment	$	309.2		$	320.2
Net Realized Investment Gain	12.4			15.2
Non-operating Retirement-related Loss	(11.6		)	(8.0		)
Income Tax	(96.1		)	(103.8		)
Net Income	$	213.9		$	223.6

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 March 31
	2012		2011
	(in millions of dollars)
Unum US
Group Disability
Group Long-term Disability	$	395.5	$	397.0
Group Short-term Disability	117.7		111.0
Group Life and Accidental Death & Dismemberment
Group Life	293.6		273.4
Accidental Death & Dismemberment	28.3		27.1
Supplemental and Voluntary
Individual Disability - Recently Issued	118.4		115.1
Voluntary Benefits	158.5		145.2
	1,112.0		1,068.8
Unum UK
Group Long-term Disability	101.9		103.4
Group Life	52.7		47.6
Supplemental and Voluntary	16.1		16.1
	170.7		167.1
Colonial Life
Accident, Sickness, and Disability	180.2		172.3
Life	51.7		46.2
Cancer and Critical Illness	64.4		61.9
	296.3		280.4
Closed Block
Individual Disability	187.2		202.3
Long-term Care	155.2		150.6
All Other	0.5		0.3
	342.9		353.2
Total	$	1,921.9	$	1,869.5

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 March 31, 2012
Premium Income	$	1,112.0	$	170.7	$	296.3	$	342.9	$	—		$	1,921.9
Net Investment Income	238.6		36.5		35.6		301.6		7.2			619.5
Other Income	31.1		0.1		0.1		25.9		0.3			57.5
Operating Revenue	$	1,381.7	$	207.3	$	332.0	$	670.4	$	7.5		$	2,598.9
Operating Income (Loss)	$	205.9	$	38.8	$	69.7	$	15.4	$	(20.6	)	$	309.2
Three Months Ended March 31, 2011
Premium Income	$	1,068.8	$	167.1	$	280.4	$	353.2	$	—		$	1,869.5
Net Investment Income	233.7		44.9		31.3		294.3		14.5			618.7
Other Income	31.0		0.1		0.1		27.5		1.0			59.7
Operating Revenue	$	1,333.5	$	212.1	$	311.8	$	675.0	$	15.5		$	2,547.9
Operating Income (Loss)	$	194.7	$	48.9	$	66.5	$	31.9	$	(21.8	)	$	320.2

Assets by segment are as follows:

	March 31		December 31
	2012		2011
	(in millions of dollars)
Unum US	$	18,621.5	$	18,583.6
Unum UK	3,746.8		3,549.5
Colonial Life	3,209.3		3,167.8
Closed Block	31,306.2		31,439.5
Corporate	2,688.0		2,814.8
Total	$	59,571.8	$	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
	Mar. 31, 2012	Mar. 31, 2011
Numerator
Net Income	$ 213.9	$ 223.6
Denominator (000s)
Weighted Average Common Shares - Basic	290,429,500	312,742,300
Dilution for Assumed Exercises of Stock Options and Nonvested Stock Awards	854,500	1,590,000
Weighted Average Common Shares - Assuming Dilution	291,284,000	314,332,300
Net Income Per Common Share
Earnings Per Share, Basic	$ 0.74	$ 0.72
Earnings Per Share, Assuming Dilution	$ 0.73	$ 0.71

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Investments

3 Months Ended

Mar. 31, 2012

Notes to Financial Statements [Abstract]

Investments

Investments

Fixed Maturity Securities

At March 31, 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.

	March 31, 2012
	(in millions of dollars)
	Amortized Cost		Gross Unrealized Gain		Gross Unrealized Loss		Fair Value
United States Government and Government Agencies and Authorities	$	997.1	$	254.5	$	2.0	$	1,249.6
States, Municipalities, and Political Subdivisions	1,341.1		226.5		11.2		1,556.4
Foreign Governments	1,185.3		226.5		—		1,411.8
Public Utilities	9,026.0		1,451.0		36.1		10,440.9
Mortgage/Asset-Backed Securities	2,504.4		338.8		0.9		2,842.3
All Other Corporate Bonds	21,793.6		3,178.8		106.6		24,865.8
Redeemable Preferred Stocks	40.5		4.5		0.6		44.4
Total Fixed Maturity Securities	$	36,888.0	$	5,680.6	$	157.4	$	42,411.2

	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 March 31, 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.

	March 31, 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	$	8.9	$	0.2	$	5.6	$	1.8
States, Municipalities, and Political Subdivisions	68.7		3.8		74.8		7.4
Public Utilities	229.4		19.0		128.9		17.1
Mortgage/Asset-Backed Securities	38.6		0.3		9.0		0.6
All Other Corporate Bonds	1,253.4		39.9		590.1		66.7
Redeemable Preferred Stocks	—		—		6.9		0.6
Total Fixed Maturity Securities	$	1,599.0	$	63.2	$	815.3	$	94.2

	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.

	March 31, 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	$	617.5	$	17.3	$	629.8	$	—	$	5.0
Over 1 year through 5 years	5,281.0		496.2		5,428.0		6.2		343.0
Over 5 years through 10 years	9,659.8		1,315.4		10,269.9		34.5		670.8
Over 10 years	18,825.3		3,512.9		20,874.5		115.8		1,347.9
	34,383.6		5,341.8		37,202.2		156.5		2,366.7
Mortgage/Asset-Backed Securities	2,504.4		338.8		2,794.7		0.9		47.6
Total Fixed Maturity Securities	$	36,888.0	$	5,680.6	$	39,996.9	$	157.4	$	2,414.3

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 March 31, 2012, the fair value of investment-grade fixed maturity securities was $39,474.5 million, with a gross unrealized gain of $5,533.2 million and a gross unrealized loss of $88.0 million. The gross unrealized loss on investment-grade fixed maturity securities was 55.9 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 March 31, 2012, the fair value of below-investment-grade fixed maturity securities was $2,936.7 million, with a gross unrealized gain of $147.4 million and a gross unrealized loss of $69.4 million. The gross unrealized loss on below-investment-grade fixed maturity securities was 44.1 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 March 31, 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 March 31, 2012, we held 88 individual investment-grade fixed maturity securities and 45 individual below-investment-grade fixed maturity securities that were in an unrealized loss position, of which 30 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. We held no fixed maturity securities as of the beginning of 2012 or at the end of the first quarter of 2012 for which a portion of an other-than-temporary impairment was previously recognized in other comprehensive income.

	Three Months Ended
	March 31, 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 March 31, 2012, we had non-binding commitments of $81.0 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 March 31, 2012, the carrying amount of our variable interest entity investments that are not consolidated under the provisions of GAAP was $444.2 million, comprised of $339.2 million of tax credit partnerships and $105.0 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 $152.0 million at March 31, 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 $84.9 million to fund certain private equity partnerships at March 31, 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 $125.0 million, $0.1 million, and $8.6 million, respectively, as of March 31, 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 March 31, 2012, we had no commitments to fund the underlying partnerships, nor did we fund any amounts to the partnerships during the three months ended March 31, 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:

	March 31, 2012				December 31, 2011
	Carrying		Percent of		Carrying		Percent of
	Amount		Total		Amount		Total
	(in millions of dollars)
Property Type
Apartment	$	27.8	1.7	%	$	28.0	1.8	%
Industrial	504.5		31.2		502.0		31.1
Mixed	93.0		5.8		93.5		5.8
Office	663.8		41.1		659.3		40.9
Retail	319.8		19.8		322.4		20.0
Other	7.0		0.4		7.1		0.4
Total	$	1,615.9	100.0	%	$	1,612.3	100.0	%

Region
New England	$	145.8	9.0	%	$	147.0	9.1	%
Mid-Atlantic	172.5		10.7		174.1		10.8
East North Central	211.3		13.1		212.7		13.2
West North Central	149.9		9.3		151.2		9.4
South Atlantic	397.5		24.6		383.8		23.8
East South Central	52.1		3.2		52.4		3.3
West South Central	158.8		9.8		160.4		9.9
Mountain	69.0		4.3		69.5		4.3
Pacific	259.0		16.0		261.2		16.2
Total	$	1,615.9	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:

	March 31		December 31
	2012		2011
	(in millions of dollars)
Internal Rating
Aa	$	13.9	$	10.9
A	690.7		712.6
Baa	878.1		855.0
Ba	20.1		20.7
B	13.1		13.1
Total	$	1,615.9	$	1,612.3

Loan-to-Value Ratio
<= 65%	$	614.7	$	578.4
> 65% <= 75%	778.3		802.3
> 75% <= 85%	171.6		165.1
> 85% <= 100%	51.3		66.5
Total	$	1,615.9	$	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 March 31
	2012		2011
	(in millions of dollars)
Balance at Beginning of Year	$	1.5	$	1.5
Provision	0.5		—
Balance at End of Period	$	2.0	$	1.5

Note 4 - Investments - Continued

Impaired mortgage loans are as follows:

	March 31, 2012
	(in millions of dollars)
			Unpaid
	Recorded		Principal		Related
	Investment		Balance		Allowance
With an Allowance Recorded	$	22.0	$	24.0	$	2.0
	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

For the three months ended March 31, 2012 and 2011, our average investment in impaired mortgage loans was $23.7 million and $13.1 million, respectively. For the three months ended March 31, 2012 and 2011, we recognized $0.2 million and $0.3 million of interest income, respectively, on mortgage loans subsequent to impairment.

Our troubled debt restructurings during the three months ended March 31, 2012 and 2011 were comprised entirely of loan foreclosures. A summary of our troubled debt restructurings is as follows:

	Three Months Ended March 31
	2012		2011
	(in millions of dollars)
Foreclosure
Carrying Amount	$	4.2	$	9.8
Number of Loans	1		1

We had no realized losses on loan foreclosures for the three months ended March 31, 2012 and 2011.

As of March 31, 2012 and December 31, 2011, we held one mortgage loan that was past due regarding principal and interest payments and for which we had discontinued the accrual of investment income. This loan was greater than 90 days past due as of March 31, 2012 and December 31, 2011 and had a carrying value of $8.9 million and $9.4 million, respectively.

At March 31, 2012, we had non-binding commitments of $29.9 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.

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.

Note 4 - Investments - Continued

We account for all of our securities lending agreements and repurchase agreements as collateralized financings. As of March 31, 2012, the carrying amount of fixed maturity securities loaned to third parties under our securities lending program was $374.1 million, for which we received collateral in the form of cash and securities of $372.2 million and $16.4 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 March 31, 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 March 31
	2012			2011
	(in millions of dollars)
Fixed Maturity Securities
Gross Gains on Sales	$	5.9		$	9.5
Gross Losses on Sales	(5.0		)	(6.9		)
Other-Than-Temporary Impairment Loss	—			(2.3		)
Mortgage Loans and Other Invested Assets
Gross Gains on Sales	—			1.2
Impairment Loss	(0.5		)	—
Embedded Derivative in Modified Coinsurance Arrangement	12.3			14.1
Foreign Currency Transactions	(0.3		)	(0.4		)
Net Realized Investment Gain	$	12.4		$	15.2

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Derivative Financial Instruments

3 Months Ended

Mar. 31, 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 use 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 $8.7 million at March 31, 2012. We held cash collateral of $42.6 million and $45.6 million from our counterparties as of March 31, 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 $135.1 million and $114.9 million at March 31, 2012 and December 31, 2011, respectively. We had no cash posted as collateral to our counterparties at March 31, 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 $174.3 million and $173.7 million at March 31, 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 December 31, 2010	$	174.0	$	617.9	$	890.0	$	—	$	1,681.9
Additions	—		—		—		19.9		19.9
Terminations	—		11.0		55.0		19.9		85.9
Balance at March 31, 2011	$	174.0	$	606.9	$	835.0	$	—	$	1,615.9
Balance at December 31, 2011	$	174.0	$	554.0	$	685.0	$	—	$	1,413.0
Additions	—		—		—		35.0		35.0
Terminations	—		3.9		45.0		35.0		83.9
Balance at March 31, 2012	$	174.0	$	550.1	$	640.0	$	—	$	1,364.1

The following table summarizes the timing of anticipated settlements of interest rate swaps outstanding under our cash flow hedging programs at March 31, 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	$	140.0		$	150.0		$	290.0
Weighted Average Receive Rate	6.49		%	6.34		%	6.41		%
Weighted Average Pay Rate	0.47		%	0.47		%	0.47		%

Cash Flow Hedges

As of March 31, 2012 and December 31, 2011, we had $290.0 million and $335.0 million, respectively, notional amount of forward starting interest rate swaps to hedge the anticipated purchase of fixed maturity securities.

As of March 31, 2012 and December 31, 2011, we had $550.1 million and $554.0 million, respectively, notional amount of open current and forward foreign currency swaps to hedge fixed income foreign currency-denominated securities.

During the three months ended March 31, 2012, we entered into and subsequently terminated $35.0 million notional amount of forward treasury locks used to minimize interest rate risk associated with the anticipated disposal of certain fixed maturity securities. These treasury locks were terminated at the time the securities were called, and we recognized a loss of $0.1 million on the termination of these hedges. The loss was recognized in other comprehensive income and subsequently amortized into net investment income.

During the three months ended March 31, 2011, we entered into and subsequently terminated $19.9 million notional amount of forward treasury locks used to minimize interest rate risk associated with the anticipated disposal of certain fixed maturity securities. These treasury locks were terminated at the time the securities were called and/or sold, and we recognized a gain of $0.1 million on the termination of these hedges. The gain was recognized in other comprehensive income and subsequently amortized into net investment income.

For the three months ended March 31, 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 March 31, 2012, we expect to amortize approximately $36.2 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 March 31, 2012. Fluctuations in fair values of these derivatives between March 31, 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 March 31, 2012, we are hedging the variability of future cash flows associated with forecasted transactions through the year 2038.

Fair Value Hedges

As of March 31, 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.  For the three months ended March 31, 2012 and 2011, the change in fair value of the hedged fixed maturity securities attributable to the hedged benchmark interest rate resulted in losses of $1.7 million and $2.6 million, respectively, with offsetting gains on the related interest rate swaps.

As of March 31, 2012 and 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. This swap effectively converts 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. For the three months ended March 31, 2012, the change in fair value of the hedged fixed debt attributable to the hedged benchmark interest rate resulted in a de minimis loss, with an offsetting de minimis gain on the related interest rate swaps. For the three months ended March 31, 2011, the change in fair value of the hedged fixed debt attributable to the hedged benchmark interest rate resulted in a gain of $2.1 million, with an offsetting loss on the related interest rate swaps.

For the three months ended March 31, 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.

	March 31, 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	Other L-T Investments	$	109.0	Other Liabilities	$	31.2
Foreign Exchange Contracts	Other L-T Investments	2.9		Other Liabilities	143.1
Total		$	111.9		$	174.3
Not Designated as Hedging Instruments
Embedded Derivative in Modified Coinsurance Arrangement				Other Liabilities	$	123.4

	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 March 31, 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	$	18.3		$	9.1		(1)
Interest Rate Swaps	—			0.1			(2)
Interest Rate Swaps	—			(0.4		)	(3)
Foreign Exchange Contracts	—			(0.2		)	(1)
Foreign Exchange Contracts	(2.9		)	(12.4		)	(2)
Total	$	15.4		$	(3.8	)

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

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

(3) Loss recognized in interest and debt expense

	Three Months Ended March 31, 2011
	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	$	14.6		$	8.4		(1)
Interest Rate Swaps	—			1.2			(2)
Interest Rate Swaps	—			(0.4		)	(3)
Foreign Exchange Contracts	—			(0.3		)	(1)
Foreign Exchange Contracts	(7.9		)	(18.5		)	(2)
Total	$	6.7		$	(9.6	)

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

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

(3) Loss recognized in interest and debt expense

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

	Three Months Ended March 31
	2012		2011
	(in millions of dollars)
Gain Recognized in Net Realized Investment Gain	$	12.3	$	14.1

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Pensions and Other Postretirement Benefits

3 Months Ended

Mar. 31, 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 March 31
	Pension Benefits
	U.S. Plans						Non U.S. Plans						OPEB
	2012			2011			2012			2011			2012			2011
	(in millions of dollars)
Service Cost	$	12.2		$	10.6		$	1.2		$	1.2		$	0.4		$	0.5
Interest Cost	21.1			19.4			2.1			2.2			2.4			2.5
Expected Return on Plan Assets	(22.2		)	(21.9		)	(2.7		)	(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		$	16.0		$	0.7		$	0.3		$	2.0		$	2.2

We have no regulatory contribution requirements for our U.S. qualified defined benefit plan in 2012. For our U.K. operation, which maintains a separate defined benefit plan, we made required contributions of $1.1 million, or approximately £0.7 million, during the three months ended March 31, 2012.

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Other Other - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Dec. 31, 2011
Short-term Debt	$ 372.2		$ 312.3
Repayments of Long-term Debt	17.5	24.2
Unrecognized Tax Benefits	82.5
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense	0.5	1.2
Northwind Holdings LLC [Member]
Repayments of Long-term Debt	15.0
Tailwind Holdings LLC [Member]
Repayments of Long-term Debt	2.5
Minimum [Member]
Unrecognized Tax Benefits Reasonably Possible Decreases Resulting from Settlements with Taxing Authorities	0
Maximum [Member]
Unrecognized Tax Benefits Reasonably Possible Decreases Resulting from Settlements with Taxing Authorities	$ 66.0

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Fair Values of Financial Instruments - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Dec. 31, 2011
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying amount of policy loans	$ 3,049.0		$ 3,051.4
Embedded Derivative in Modified Coinsurance Arrangement	12.3	14.1
Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term Debt, Fair Value	1,170.2
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	14.70%
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	85.30%
Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term Debt, Fair Value	1,143.3
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	67.10%
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	4.90%
Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term Debt, Fair Value	2.3
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	13.30%
Policy Loans Ceded
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying amount of policy loans	$ 2,834.9		$ 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
	Mar. 31, 2012		Mar. 31, 2011
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in OCI on Derivatives (Effective Portion)	$ 15.4		$ 6.7
Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	(3.8)		(9.6)
Interest Rate Swaps | Net Investment Income
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in OCI on Derivatives (Effective Portion)	18.3		14.6
Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	9.1	[1]	8.4	[1]
Interest Rate Swaps | Net Realized Investments Gain (Loss)
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in OCI on Derivatives (Effective Portion)	0		0
Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	0.1	[2]	1.2	[2]
Interest Rate Swaps | Interest and Debt Expenses
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in OCI on Derivatives (Effective Portion)	0		0
Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	(0.4)	[3]	(0.4)
Foreign Exchange Contracts | Net Investment Income
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in OCI on Derivatives (Effective Portion)	0		0
Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	(0.2)	[1]	(0.3)	[1]
Foreign Exchange Contracts | Net Realized Investments Gain (Loss)
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in OCI on Derivatives (Effective Portion)	(2.9)		(7.9)
Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	$ (12.4)	[2]	$ (18.5)	[2]

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

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

[3] Loss recognized in interest and debt expense

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Fair Values of Financial Instruments (Tables)

3 Months Ended

Mar. 31, 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.

	March 31, 2012				December 31, 2011
	Carrying Amount		Fair Value		Carrying Amount		Fair Value
	(in millions of dollars)
Assets
Fixed Maturity Securities	$	42,411.2	$	42,411.2	$	42,486.7	$	42,486.7
Mortgage Loans	1,615.9		1,792.1		1,612.3		1,789.8
Policy Loans	3,049.0		3,115.4		3,051.4		3,124.4
Other Long-term Investments
Derivatives	111.9		111.9		137.7		137.7
Equity Securities	12.6		12.6		11.2		11.2
Miscellaneous Long-term Investments	452.8		452.8		436.4		436.4
Liabilities
Policyholders' Funds
Deferred Annuity Products	$	641.1	$	641.1	$	641.1	$	641.1
Supplementary Contracts without Life Contingencies	508.7		508.7		502.6		502.6
Long-term Debt	2,552.8		2,585.8		2,570.2		2,540.2
Other Liabilities
Derivatives	174.3		174.3		173.7		173.7
Embedded Derivative in Modified Coinsurance Arrangement	123.4		123.4		135.7		135.7
Unfunded Commitments to Investment Partnerships	152.0		152.0		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:

	March 31, 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	$	118.7	$	1,130.9	$	—	$	1,249.6
States, Municipalities, and Political Subdivisions	32.4		1,457.6		66.4		1,556.4
Foreign Governments	—		1,411.8		—		1,411.8
Public Utilities	1,041.5		8,851.1		548.3		10,440.9
Mortgage/Asset-Backed Securities	—		2,821.0		21.3		2,842.3
All Other Corporate Bonds	5,033.9		19,098.7		733.2		24,865.8
Redeemable Preferred Stocks	—		14.1		30.3		44.4
Total Fixed Maturity Securities	6,226.5		34,785.2		1,399.5		42,411.2
Other Long-term Investments
Derivatives
Interest Rate Swaps	—		109.0		—		109.0
Foreign Exchange Contracts	—		2.9		—		2.9
Total Derivatives	—		111.9		—		111.9
Equity Securities	—		8.1		4.5		12.6
Liabilities
Other Liabilities
Derivatives
Interest Rate Swaps	$	—	$	31.2	$	—	$	31.2
Foreign Exchange Contracts	—		143.1		—		143.1
Embedded Derivative in Modified Coinsurance Arrangement	—		—		123.4		123.4
Total Derivatives	—		174.3		123.4		297.7

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 March 31
	2012				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	$	—	$	204.2	$	16.1	$	—
States, Municipalities, and Political Subdivisions	—		43.8		25.4		274.9
Foreign Governments	—		—		—		0.7
Public Utilities	826.2		454.4		885.5		481.1
All Other Corporate Bonds	3,042.8		1,684.5		3,064.3		1,540.8
Total Fixed Maturity Securities	$	3,869.0	$	2,386.9	$	3,991.3	$	2,297.5

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 March 31, 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		$	—		$	(3.2	)	$	—	$	—		$	9.9	$	(8.4	)	$	66.4
Public Utilities	338.9			—			(0.1		)	—		(0.9		)	416.9		(206.5		)	548.3
Mortgage/Asset-Backed Securities	31.7			—			2.4			—		—			—		(12.8		)	21.3
All Other Corporate Bonds	665.5			—			7.0			12.0		(40.3		)	223.0		(134.0		)	733.2
Redeemable Preferred Stocks	37.2			(1.0		)	2.1			—		(14.3		)	6.3		—			30.3
Total Fixed Maturity Securities	1,141.4			(1.0		)	8.2			12.0		(55.5		)	656.1		(361.7		)	1,399.5
Equity Securities	11.2			—			—			—		—			—		(6.7		)	4.5
Embedded Derivative in Modified Coinsurance Arrangement	(135.7		)	12.3			—			—		—			—		—			(123.4		)
	Three Months Ended March 31, 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		$	—		$	(0.7	)	$	7.0	$	(0.3	)	$	249.7	$	(104.6	)	$	324.7
Mortgage/Asset-Backed Securities	0.7			—			(1.6		)	—		(2.2		)	35.3		—			32.2
All Other Corporate Bonds	829.7			(0.2		)	0.5			16.7		(3.3		)	153.1		(362.7		)	633.8
Redeemable Preferred Stocks	21.7			—			—			—		—			—		(21.6		)	0.1
Total Fixed Maturity Securities	1,025.7			(0.2		)	(1.8		)	23.7		(5.8		)	438.1		(488.9		)	990.8
Equity Securities	1.5			—			—			—		—			—		—			1.5
Embedded Derivative in Modified Coinsurance Arrangement	(96.3		)	14.1			—			—		—			—		—			(82.2		)

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:

	March 31, 2012
	(in millions of dollars)
	Fair Value			Unobservable Input		Range/Weighted Average
Fixed Maturity Securities
States, Municipalities, and Political Subdivisions - Private	$	66.4		- Comparability Adjustment - Discount for Size - Volatility of Credit	(b) (c) (e)	0.50% - 1.25%/0.87% 0.20% - 0.20%/0.20% 0.25% - 0.25%/0.25%
Mortgage/Asset-Backed Securities - Private	0.6			- Discount for Size	(c)	4.99% - 5.08%/5.06%
All Other Corporate Bonds - Private	295.6			- Change in Benchmark Reference - Comparability Adjustment - Discount for Size - Lack of Marketability - Volatility of Credit - Market Convention	(a) (b) (c) (d) (e) (f)	1.65% - 1.65%/1.65% 0.03% - 0.75%/0.50% 0.50% - 0.50%/0.50% 0.50% - 1.00%/0.74% (0.50)% - 7.72%/1.27% Priced at Par
All Other Corporate Bonds - Public	117.5			- Change in Benchmark Reference - Comparability Adjustment - Discount for Size	(a) (b) (c)	0.25% - 0.47%/0.27% 0.25% - 0.50%/0.41% 0.25% - 0.25%/0.25%
Equity Securities - Private	4.0			- Market Convention	(f)	Priced at Cost or Owner's Equity
Embedded Derivative in Modified Coinsurance Arrangement	(123.4		)	- 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 illiquidity

(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

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Stockholders' Equity and Earnings Per Common Share (Tables)

3 Months Ended

Mar. 31, 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 March 31
	2012		2011
	(in millions of dollars, except share data)
Numerator
Net Income	$	213.9	$	223.6
Denominator (000s)
Weighted Average Common Shares - Basic	290,429.5		312,742.3
Dilution for Assumed Exercises of Stock Options and Nonvested Stock Awards	854.5		1,590.0
Weighted Average Common Shares - Assuming Dilution	291,284.0		314,332.3
Net Income Per Common Share
Basic	$	0.74	$	0.72
Assuming Dilution	$	0.73	$	0.71

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Timing of Anticipated Settlements of Interest Rate Swaps Outstanding (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011	Mar. 31, 2011	Dec. 31, 2010
Derivative [Line Items]
Notional Value	$ 1,364.1	$ 1,413.0	$ 1,615.9	$ 1,681.9
2012
Derivative [Line Items]
Notional Value	140.0
Weighted Average Receive Rate	6.49%
Weighted Average pay rate	0.47%
2013
Derivative [Line Items]
Notional Value	150.0
Weighted Average Receive Rate	6.34%
Weighted Average pay rate	0.47%
Receive Fixed/Pay Variable
Derivative [Line Items]
Notional Value	$ 290.0
Weighted Average Receive Rate	6.41%
Weighted Average pay rate	0.47%

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Mortgage Loans, Sorted by Applicable Credit Quality Indicators, Internal rating (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans	$ 1,615.9	$ 1,612.3
Aa
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans	13.9	10.9
A
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans	690.7	712.6
Baa
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans	878.1	855.0
Ba
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans	20.1	20.7
B
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans	$ 13.1	$ 13.1

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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Net Income	$ 213.9	$ 223.6
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 benefit of $110.2; $40.7)	(196.5)	(77.3)
Change in Net Unrealized Gain on Securities Other-Than-Temporarily Impaired (net of tax benefit of $-; $1.1)	0	(2.1)
Total Change in Net Unrealized Gain on Securities Before Reclassification Adjustment (net of tax benefit of $110.2; $41.8)	(196.5)	(79.4)
Reclassification Adjustment for Net Realized Investment Gain (net of tax expense of $0.3; $0.5)	(0.7)	(0.6)
Change in Net Gain on Cash Flow Hedges (net of tax benefit of $5.9; $5.4)	(10.7)	(9.9)
Change in Adjustment to Reserves for Future Policy and Contract Benefits, Net of Reinsurance and Other (net of tax expense of $97.2; $59.8)	166.8	113.2
Change in Foreign Currency Translation Adjustment	28.2	26.5
Change in Unrecognized Pension and Postretirement Benefit Costs (net of tax expense of $3.5; $1.6)	6.5	5.1
Total Other Comprehensive Income (Loss)	(6.4)	54.9
Comprehensive Income	$ 207.5	$ 278.5

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Basis of Presentation

3 Months Ended

Mar. 31, 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 March 31, 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
	Mar. 31, 2012	Mar. 31, 2011
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Amortization of Actuarial Loss	$ (11.6)	$ (8.0)
Pension Benefits, U.S. Plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service Cost	12.2	10.6
Interest Cost	21.1	19.4
Expected Return on Plan Assets	(22.2)	(21.9)
Amortization of Actuarial Loss	11.5	8.0
Amortization of Prior Service Credit	(0.1)	(0.1)
Total	22.5	16.0
Pension Benefits, Non U.S. Plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service Cost	1.2	1.2
Interest Cost	2.1	2.2
Expected Return on Plan Assets	(2.7)	(3.1)
Amortization of Actuarial Loss	0.1	0
Amortization of Prior Service Credit	0	0
Total	0.7	0.3
Other Postretirement Benefit Plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service Cost	0.4	0.5
Interest Cost	2.4	2.5
Expected Return on Plan Assets	(0.2)	(0.2)
Amortization of Actuarial Loss	0	0
Amortization of Prior Service Credit	(0.6)	(0.6)
Total	$ 2.0	$ 2.2

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Accounting Developments - ASU Impact (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Dec. 31, 2011
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Deferred Acquisition Costs	$ 1,699.7		$ 1,677.1
Deferred Income Tax	88.9		44.7
Net Unrealized Gain on Securities Not Other-Than-Temporarily Impaired	584.4		614.8
Foreign Currency Translation Adjustment	(89.4)		(117.6)
Retained Earnings	6,793.5		6,611.0
Deferral of Acquisition Costs	(117.4)	(112.2)
Amortization of Deferred Acquisition Costs	99.4	95.0
Income Tax - Deferred	58.8	38.5
Net Income	213.9	223.6
Earnings Per Share, Basic	$ 0.74	$ 0.72
Earnings Per Share, Assuming Dilution	$ 0.73	$ 0.71
Change in Adjustment to Reserves for Future Policy and Contract Benefits, Net of Reinsurance and Other	166.8	113.2
Change in Foreign Currency Translation Adjustment	28.2	26.5
Change in Deferred Acquisition Costs	(18.0)	(17.2)
Change in Income Taxes	116.7	82.0
Previous Accounting Guidance [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Deferred Acquisition Costs		2,542.9	2,300.9
Deferred Income Tax		471.2	261.2
Net Unrealized Gain on Securities Not Other-Than-Temporarily Impaired		443.6	605.8
Foreign Currency Translation Adjustment		(84.1)	(121.5)
Retained Earnings		7,112.3	7,031.2
Deferral of Acquisition Costs		(158.3)
Amortization of Deferred Acquisition Costs		138.3
Income Tax - Deferred		39.5
Net Income		225.4
Earnings Per Share, Basic		$ 0.72
Earnings Per Share, Assuming Dilution		$ 0.72
Change in Adjustment to Reserves for Future Policy and Contract Benefits, Net of Reinsurance and Other		113.2
Change in Foreign Currency Translation Adjustment		26.8
Change in Deferred Acquisition Costs		(20.0)
Change in Income Taxes		83.0
Adjustments for New Accounting Pronouncement [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Deferred Acquisition Costs		1,834.6	1,677.1
Deferred Income Tax		224.5	44.7
Net Unrealized Gain on Securities Not Other-Than-Temporarily Impaired		449.3	614.8
Foreign Currency Translation Adjustment		(80.6)	(117.6)
Retained Earnings		6,641.5	6,611.0
Deferral of Acquisition Costs		(112.2)
Amortization of Deferred Acquisition Costs		95.0
Income Tax - Deferred		38.5
Net Income		223.6
Earnings Per Share, Basic		$ 0.72
Earnings Per Share, Assuming Dilution		$ 0.71
Change in Adjustment to Reserves for Future Policy and Contract Benefits, Net of Reinsurance and Other		113.2
Change in Foreign Currency Translation Adjustment		26.5
Change in Deferred Acquisition Costs		(17.2)
Change in Income Taxes		82.0
Restatement Adjustment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Deferred Acquisition Costs		(708.3)	(623.8)
Deferred Income Tax		(246.7)	(216.5)
Net Unrealized Gain on Securities Not Other-Than-Temporarily Impaired		5.7
Foreign Currency Translation Adjustment		3.5	3.9
Retained Earnings		(470.8)	(420.2)
Deferral of Acquisition Costs		46.1
Amortization of Deferred Acquisition Costs		(43.3)
Income Tax - Deferred		(1.0)
Net Income		(1.8)
Earnings Per Share, Basic		$ 0.00
Earnings Per Share, Assuming Dilution		$ (0.01)
Change in Adjustment to Reserves for Future Policy and Contract Benefits, Net of Reinsurance and Other		0
Change in Foreign Currency Translation Adjustment		(0.3)
Change in Deferred Acquisition Costs		2.8
Change in Income Taxes		$ (1.0)

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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	3 Months Ended
	Mar. 31, 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 Accounting Developments (Tables)

3 Months Ended

Mar. 31, 2012

Accounting Developments [Abstract]

ASU Impact Schedule

	Historical
	Accounting			As			Effect of
	Method			Adjusted			Change
	(in millions of dollars, except share data)
At or for the Three Months Ended March 31, 2011
Consolidated Balance Sheets
Deferred Acquisition Costs	$	2,542.9		$	1,834.6		$	(708.3	)
Deferred Income Tax	471.2			224.5			(246.7		)
Net Unrealized Gain on Securities Not Other-Than-Temporarily Impaired	443.6			449.3			5.7
Foreign Currency Translation Adjustment	(84.1		)	(80.6		)	3.5
Retained Earnings	7,112.3			6,641.5			(470.8		)
Consolidated Statements of Income
Deferral of Acquisition Costs	$	(158.3	)	$	(112.2	)	$	46.1
Amortization of Deferred Acquisition Costs	138.3			95.0			(43.3		)
Income Tax - Deferred	39.5			38.5			(1.0		)
Net Income	225.4			223.6			(1.8		)
Net Income Per Common Share
Basic	0.72			0.72			—
Assuming Dilution	0.72			0.71			(0.01		)
Consolidated Statements of Comprehensive Income
Net Income	$	225.4		$	223.6		$	(1.8	)
Change in Adjustment to Reserves for Future Policy and Contract Benefits, Net of Reinsurance and Other	113.2			113.2			—
Change in Foreign Currency Translation Adjustment	26.8			26.5			(0.3		)
Consolidated Statements of Cash Flows
Net Income	$	225.4		$	223.6		$	(1.8	)
Change in Deferred Acquisition Costs	(20.0		)	(17.2		)	2.8
Change in Income Taxes	83.0			82.0			(1.0		)
December 31, 2011
Consolidated Balance Sheets
Deferred Acquisition Costs	$	2,300.9		$	1,677.1		$	(623.8	)
Deferred Income Tax	261.2			44.7			(216.5		)
Net Unrealized Gain on Securities Not Other-Than-Temporarily Impaired	605.8			614.8			9.0
Foreign Currency Translation Adjustment	(121.5		)	(117.6		)	3.9
Retained Earnings	7,031.2			6,611.0			(420.2		)