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, 2013

o 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

266,927,641 shares of the registrant's common stock were outstanding as of April 29, 2013.

TABLE OF CONTENTS

		Page
	Cautionary Statement Regarding Forward-Looking Statements	1
	PART I
1.	Financial Statements (Unaudited):	2
	Consolidated Balance Sheets at March 31, 2013 and December 31, 2012	2
	Consolidated Statements of Income for the three months ended March 31, 2013 and 2012	4
	Consolidated Statements of Comprehensive Income for the three months ended March 31, 2013 and 2012	5
	Consolidated Statements of Stockholders' Equity for the three months ended March 31, 2013 and 2012	6
	Consolidated Statements of Cash Flows for the three months ended March 31, 2013 and 2012	7
	Notes to Consolidated Financial Statements	8
	Review Report of Independent Registered Public Accounting Firm	43
2.	Management's Discussion and Analysis of Financial Condition and Results of Operations	44
3.	Quantitative and Qualitative Disclosures About Market Risk	77
4.	Controls and Procedures	77
	PART II
1.	Legal Proceedings	78
1A.	Risk Factors	78
2.	Unregistered Sales of Equity Securities and Use of Proceeds	78
6.	Exhibits	79
	Signatures	80

Cautionary Statement Regarding Forward-Looking Statements

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

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.

• Sustained periods of low interest rates.

• Fluctuation in insurance reserve liabilities and claim payments due to 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.

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

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

• Effects of business disruption or economic contraction due to disasters such as terrorist attacks, cyber attacks, other hostilities, or natural catastrophes, including any related impact on the value of our investment portfolio, our disaster recovery systems, cyber or other information security systems, and management continuity planning.

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

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

• Changes in our financial strength and credit ratings.

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

• 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.

• Changes in demand for our products due to, among other factors, changes in societal attitudes, the rate of unemployment, consumer confidence, and/or legislative and regulatory changes, including healthcare reform.

• Effectiveness of our risk management program.

• The level and results of litigation.

• Changes in accounting standards, practices, or policies.

• Fluctuation in foreign currency exchange rates.

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

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

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

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, 2012.

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

Unum Group and Subsidiaries

	March 31		December 31
	2013		2012
	(in millions of dollars)
	(Unaudited)
Assets
Investments
Fixed Maturity Securities - at fair value (amortized cost: $37,632.6; $37,751.5)	$	44,436.5	$	44,973.0
Mortgage Loans	1,730.4		1,712.7
Policy Loans	3,141.4		3,133.8
Other Long-term Investments	592.8		625.0
Short-term Investments	1,200.5		1,460.3
Total Investments	51,101.6		51,904.8
Other Assets
Cash and Bank Deposits	102.0		77.3
Accounts and Premiums Receivable	1,695.1		1,632.6
Reinsurance Recoverable	4,898.6		4,842.6
Accrued Investment Income	741.9		694.6
Deferred Acquisition Costs	1,753.1		1,755.5
Goodwill	200.9		201.7
Property and Equipment	499.0		501.6
Other Assets	619.2		625.4
Total Assets	$	61,611.4	$	62,236.1

See notes to consolidated financial statements.

2

CONSOLIDATED BALANCE SHEETS - Continued

Unum Group and Subsidiaries

	March 31			December 31
	2013			2012
	(in millions of dollars)
	(Unaudited)
Liabilities and Stockholders' Equity
Liabilities
Policy and Contract Benefits	$	1,509.3		$	1,484.6
Reserves for Future Policy and Contract Benefits	44,364.5			44,694.4
Unearned Premiums	477.9			426.7
Other Policyholders’ Funds	1,635.8			1,644.9
Income Tax Payable	77.8			54.2
Deferred Income Tax	232.5			269.4
Short-term Debt	236.3			455.8
Long-term Debt	2,673.9			2,755.4
Other Liabilities	1,845.6			1,838.1
Total Liabilities	53,053.6			53,623.5
Commitments and Contingent Liabilities - Note 10
Stockholders' Equity
Common Stock, $0.10 par
Authorized: 725,000,000 shares
Issued: 360,260,522 and 359,751,943 shares	36.0			36.0
Additional Paid-in Capital	2,613.4			2,607.7
Accumulated Other Comprehensive Income	485.7			628.0
Retained Earnings	7,548.5			7,371.6
Treasury Stock - at cost: 93,292,724 and 89,546,758 shares	(2,125.8		)	(2,030.7		)
Total Stockholders' Equity	8,557.8			8,612.6
Total Liabilities and Stockholders' Equity	$	61,611.4		$	62,236.1

See notes to consolidated financial statements.

3

CONSOLIDATED STATEMENTS OF INCOME (UNAUDITED)

Unum Group and Subsidiaries

	Three Months Ended March 31
	2013			2012
	(in millions of dollars, except share data)
Revenue
Premium Income	$	1,930.9		$	1,921.9
Net Investment Income	621.1			619.5
Realized Investment Gain (Loss)
Other-Than-Temporary Impairment Loss on Fixed Maturity Securities	(0.8		)	—
Other Net Realized Investment Gain	11.1			12.4
Net Realized Investment Gain	10.3			12.4
Other Income	62.5			57.5
Total Revenue	2,624.8			2,611.3
Benefits and Expenses
Benefits and Change in Reserves for Future Benefits	1,648.5			1,662.9
Commissions	238.2			232.3
Interest and Debt Expense	37.1			35.5
Deferral of Acquisition Costs	(118.2		)	(117.4		)
Amortization of Deferred Acquisition Costs	123.8			99.4
Compensation Expense	197.6			206.9
Other Expenses	194.0			181.7
Total Benefits and Expenses	2,321.0			2,301.3
Income Before Income Tax	303.8			310.0
Income Tax
Current	81.8			37.3
Deferred	9.4			58.8
Total Income Tax	91.2			96.1
Net Income	$	212.6		$	213.9
Net Income Per Common Share
Basic	$	0.79		$	0.74
Assuming Dilution	$	0.79		$	0.73

See notes to consolidated financial statements.

4

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED)

Unum Group and Subsidiaries

	Three Months Ended March 31
	2013			2012
	(in millions of dollars)
Net Income	$	212.6		$	213.9
Other Comprehensive Income (Loss)
Change in Net Unrealized Gain on Securities Before Adjustment (net of tax benefit of $159.4; $110.5)	(278.5		)	(197.2		)
Change in Adjustment to Deferred Acquisition Costs and Reserves for Future Policy and Contract Benefits, Net of Reinsurance (net of tax expense of $108.6; $97.2)	197.4			166.8
Change in Net Gain on Cash Flow Hedges (net of tax benefit of $0.2; $5.9)	(2.0		)	(10.7		)
Change in Foreign Currency Translation Adjustment	(69.9		)	28.2
Change in Unrecognized Pension and Postretirement Benefit Costs (net of tax expense of $5.5; $3.5)	10.7			6.5
Total Other Comprehensive Loss	(142.3		)	(6.4		)
Comprehensive Income	$	70.3		$	207.5

See notes to consolidated financial statements.

5

CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (UNAUDITED)

Unum Group and Subsidiaries

	Three Months Ended March 31
	2013			2012
	(in millions of dollars)
Common Stock
Balance at Beginning of Year and End of Period	$	36.0		$	35.9
Additional Paid-in Capital
Balance at Beginning of Year	2,607.7			2,591.1
Common Stock Activity	5.7			9.3
Balance at End of Period	2,613.4			2,600.4
Accumulated Other Comprehensive Income
Balance at Beginning of Year	628.0			461.8
Other Comprehensive Loss	(142.3		)	(6.4		)
Balance at End of Period	485.7			455.4
Retained Earnings
Balance at Beginning of Year	7,371.6			6,611.0
Net Income	212.6			213.9
Dividends to Stockholders (per common share: $0.130; $0.105)	(35.7		)	(31.4		)
Balance at End of Period	7,548.5			6,793.5
Treasury Stock
Balance at Beginning of Year	(2,030.7		)	(1,530.1		)
Purchases of Treasury Stock	(95.1		)	(175.2		)
Balance at End of Period	(2,125.8		)	(1,705.3		)
Total Stockholders' Equity at End of Period	$	8,557.8		$	8,179.9

See notes to consolidated financial statements.

6

CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED)

Unum Group and Subsidiaries

	Three Months Ended March 31
	2013			2012
	(in millions of dollars)
Cash Flows from Operating Activities
Net Income	$	212.6		$	213.9
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities
Change in Receivables	(130.1		)	1.6
Change in Deferred Acquisition Costs	5.6			(18.0		)
Change in Insurance Reserves and Liabilities	197.6			167.3
Change in Income Taxes	40.1			116.7
Change in Other Accrued Liabilities	23.4			(68.0		)
Non-cash Adjustments to Net Investment Income	(96.1		)	(100.9		)
Net Realized Investment Gain	(10.3		)	(12.4		)
Depreciation	21.2			20.5
Other, Net	1.1			8.6
Net Cash Provided by Operating Activities	265.1			329.3
Cash Flows from Investing Activities
Proceeds from Sales of Fixed Maturity Securities	158.4			127.6
Proceeds from Maturities of Fixed Maturity Securities	518.5			596.3
Proceeds from Sales and Maturities of Other Investments	42.3			33.5
Purchase of Fixed Maturity Securities	(721.9		)	(845.7		)
Purchase of Other Investments	(43.4		)	(52.6		)
Net Sales (Purchases) of Short-term Investments	256.3			(17.2		)
Other, Net	(26.1		)	(23.7		)
Net Cash Provided (Used) by Investing Activities	184.1			(181.8		)
Cash Flows from Financing Activities
Net Short-term Debt Borrowings (Payments)	(219.5		)	59.9
Long-term Debt Repayments	(71.2		)	(17.5		)
Issuance of Common Stock	0.7			0.9
Repurchase of Common Stock	(99.0		)	(175.2		)
Dividends Paid to Stockholders	(35.7		)	(31.4		)
Other, Net	0.2			1.7
Net Cash Used by Financing Activities	(424.5		)	(161.6		)
Net Increase (Decrease) in Cash and Bank Deposits	24.7			(14.1		)
Cash and Bank Deposits at Beginning of Year	77.3			116.6
Cash and Bank Deposits at End of Period	$	102.0		$	102.5

See notes to consolidated financial statements.

7

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED)

Unum Group and Subsidiaries

March 31, 2013

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, 2012.

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

Note 2 - Accounting Developments

Accounting Updates Adopted in 2013:

Accounting Standards Codification (ASC) 210 "Balance Sheet - Disclosures about Offsetting Assets and Liabilities"

In December 2011, the Financial Accounting Standards Board (FASB) issued an update requiring 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 provide information about the effect or potential effect of netting arrangements on an entity's financial position, including the effect or potential effect of rights of set-off associated with certain financial instruments and derivative instruments. In January 2013, the FASB issued an update to clarify the scope of transactions that are subject to the disclosures about offsetting. Specifically, the update applies only to derivatives, repurchase agreements and reverse repurchase agreements, and securities borrowing and securities lending transactions to the extent they are subject to a master netting arrangement or similar agreement. We adopted these updates effective January 1, 2013. The adoption of these updates expanded our disclosures but had no effect on our financial position or results of operations.

ASC 220 "Comprehensive Income"

In February 2013, the FASB issued an update to improve the transparency of reporting reclassifications out of accumulated other comprehensive income by requiring additional information to be presented regarding certain reclassification adjustments. We adopted this update effective January 1, 2013. The adoption of this update expanded our disclosures but had no effect on our financial position or results of operations.

Accounting Updates Adopted in 2012:

ASC 220 "Comprehensive Income"

In June 2011, the 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. 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.

8

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

March 31, 2013

Note 2 - Accounting Developments - Continued

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.

9

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

March 31, 2013

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.

	March 31, 2013				December 31, 2012
	Carrying Amount		Fair Value		Carrying Amount		Fair Value
	(in millions of dollars)
Assets
Fixed Maturity Securities	$	44,436.5	$	44,436.5	$	44,973.0	$	44,973.0
Mortgage Loans	1,730.4		1,959.8		1,712.7		1,937.1
Policy Loans	3,141.4		3,219.7		3,133.8		3,215.3
Other Long-term Investments
Derivatives	62.1		62.1		81.6		81.6
Equity Securities	14.4		14.4		14.6		14.6
Miscellaneous Long-term Investments	438.4		438.4		455.1		455.1
Liabilities
Policyholders' Funds
Deferred Annuity Products	$	637.5	$	637.5	$	640.1	$	640.1
Supplementary Contracts without Life Contingencies	548.3		548.3		535.5		535.5
Long-term Debt	2,673.9		2,954.9		2,755.4		2,968.8
Other Liabilities
Derivatives	157.4		157.4		170.5		170.5
Embedded Derivative in Modified Coinsurance Arrangement	77.5		77.5		83.9		83.9
Unfunded Commitments to Investment Partnerships	75.7		75.7		83.7		83.7

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 $2,919.8 million and $2,912.7 million as of March 31, 2013 and December 31, 2012, 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.

10

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

March 31, 2013

Note 3 - Fair Values of Financial Instruments - Continued

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 fair values of $1,241.2 million and $1,212.0 million as of March 31, 2013 and December 31, 2012, respectively, 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 fair values of $1,713.7 million and $1,756.8 million as of March 31, 2013 and December 31, 2012, respectively, and are assigned a Level 2.

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

Fair Value Measurements for Financial Instruments Carried at Fair Value

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

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

11

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

March 31, 2013

Note 3 - Fair Values of Financial Instruments - Continued

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 2013, we have applied valuation techniques on a consistent basis to similar assets and liabilities and consistent with those techniques used at year end 2012.

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

The management of our investment portfolio includes establishing pricing policy and reviewing the reasonableness of sources and inputs used in developing pricing. We review all prices 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

12

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

March 31, 2013

Note 3 - Fair Values of Financial Instruments - Continued

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, 2013, approximately 9.5 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.

The remaining 90.5 percent of our fixed maturity securities were valued based on non-binding quotes or other observable and unobservable inputs, as discussed below.

• Approximately 73.4 percent of our fixed maturity securities were valued based on prices from pricing services that generally use observable inputs such as prices for securities or comparable securities in active markets in their valuation techniques. These assets were classified as Level 2.  Level 2 assets or liabilities are those valued using inputs (other than prices included in Level 1) that are either directly or indirectly observable for the asset or liability through correlation with market data at the measurement date and for the duration of the instrument's anticipated life.

• Approximately 3.4 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 13.7 percent of our fixed maturity securities were valued based on prices of comparable securities, matrix pricing, market models, and/or internal models or were valued based on non-binding quotes with no other observable market data. These assets were classified as either Level 2 or Level 3, with the categorization dependent on whether there was other observable market data.  Level 3 is the lowest category of the fair value hierarchy and reflects the judgment of management regarding what market participants would use in pricing assets or liabilities at the measurement date. Financial assets and liabilities categorized as Level 3 are generally those that are valued using unobservable inputs to extrapolate an estimated fair value.

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

13

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

March 31, 2013

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, 2013
	Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
	(in millions of dollars)
Assets
Fixed Maturity Securities
United States Government and Government Agencies and Authorities	$	359.5	$	975.6	$	—	$	1,335.1
States, Municipalities, and Political Subdivisions	33.5		1,645.5		174.8		1,853.8
Foreign Governments	—		1,375.2		82.6		1,457.8
Public Utilities	596.3		10,090.4		402.5		11,089.2
Mortgage/Asset-Backed Securities	15.5		2,026.2		0.5		2,042.2
All Other Corporate Bonds	3,232.5		22,394.3		992.3		26,619.1
Redeemable Preferred Stocks	—		14.5		24.8		39.3
Total Fixed Maturity Securities	4,237.3		38,521.7		1,677.5		44,436.5
Other Long-term Investments
Derivatives
Interest Rate Swaps	—		59.6		—		59.6
Foreign Exchange Contracts	—		2.5		—		2.5
Total Derivatives	—		62.1		—		62.1
Equity Securities	—		10.1		4.3		14.4
Liabilities
Other Liabilities
Derivatives
Interest Rate Swaps	$	—	$	31.2	$	—	$	31.2
Foreign Exchange Contracts	—		125.5		—		125.5
Credit Default Swaps	—		0.7		—		0.7
Embedded Derivative in Modified Coinsurance Arrangement	—		—		77.5		77.5
Total Derivatives	—		157.4		77.5		234.9

14

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

March 31, 2013

Note 3 - Fair Values of Financial Instruments - Continued

	December 31, 2012
	Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
	(in millions of dollars)
Assets
Fixed Maturity Securities
United States Government and Government Agencies and Authorities	$	104.1	$	1,244.7	$	—	$	1,348.8
States, Municipalities, and Political Subdivisions	53.0		1,625.1		128.7		1,806.8
Foreign Governments	—		1,424.9		82.1		1,507.0
Public Utilities	84.2		10,485.6		574.4		11,144.2
Mortgage/Asset-Backed Securities	—		2,216.0		0.5		2,216.5
All Other Corporate Bonds	1,977.1		23,755.5		1,177.8		26,910.4
Redeemable Preferred Stocks	—		14.5		24.8		39.3
Total Fixed Maturity Securities	2,218.4		40,766.3		1,988.3		44,973.0
Other Long-term Investments
Derivatives
Interest Rate Swaps	—		76.5		—		76.5
Foreign Exchange Contracts	—		5.1		—		5.1
Total Derivatives	—		81.6		—		81.6
Equity Securities	—		10.3		4.3		14.6
Liabilities
Other Liabilities
Derivatives
Interest Rate Swaps	$	—	$	31.7	$	—	$	31.7
Foreign Exchange Contracts	—		138.8		—		138.8
Embedded Derivative in Modified Coinsurance Arrangement	—		—		83.9		83.9
Total Derivatives	—		170.5		83.9		254.4

15

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

March 31, 2013

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, 2013				March 31, 2012
	Transfers into
	Level 1 from Level 2		Level 2 from Level 1		Level 1 from Level 2		Level 2 from Level 1
	(in millions of dollars)
Fixed Maturity Securities
United States Government and Government Agencies and Authorities	$	256.9	$	—	$	—	$	204.2
States, Municipalities, and Political Subdivisions	—		19.4		—		43.8
Public Utilities	502.1		53.5		826.2		454.4
All Other Corporate Bonds	2,266.3		1,140.8		3,042.8		1,684.5
Total Fixed Maturity Securities	$	3,025.3	$	1,213.7	$	3,869.0	$	2,386.9

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.

16

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

March 31, 2013

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, 2013
				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
	(in millions of dollars)
Fixed Maturity Securities
States, Municipalities, and Political Subdivisions	$	128.7		$	—		$	2.7		$	—	$	—		$	43.4	$	—		$	174.8
Foreign Governments	82.1			—			0.5			—		—			—		—			82.6
Public Utilities	574.4			—			1.1			—		(0.1		)	252.3		(425.2		)	402.5
Mortgage/Asset-Backed Securities	0.5			—			—			—		—			—		—			0.5
All Other Corporate Bonds	1,177.8			0.8			(8.8		)	30.3		(18.1		)	382.4		(572.1		)	992.3
Redeemable Preferred Stocks	24.8			—			—			—		—			—		—			24.8
Total Fixed Maturity Securities	1,988.3			0.8			(4.5		)	30.3		(18.2		)	678.1		(997.3		)	1,677.5
Equity Securities	4.3			—			—			—		—			—		—			4.3
Embedded Derivative in Modified Coinsurance Arrangement	(83.9		)	6.4			—			—		—			—		—			(77.5		)
	Three Months Ended March 31, 2012
				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
	(in millions of dollars)
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		)

17

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

March 31, 2013

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, 2013 and 2012 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 $6.4 million and $12.3 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 and losses.

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

	March 31, 2013
	Fair Value			Unobservable Input		Range/Weighted Average
	(in millions of dollars)
Fixed Maturity Securities
States, Municipalities, and Political Subdivisions - Private	$	126.5		- Comparability Adjustment	(b)	0.25% - 1.25% / 0.74%
Public Utilities	89.2			- Comparability Adjustment - Volatility of Credit	(b) (e)	0.25% - 0.30% / 0.27% 0.25% - 0.25% / 0.25%
Mortgage/Asset-Backed Securities - Private	0.5			- Discount for Size	(c)	5.76% - 5.86% / 5.84%
All Other Corporate Bonds - Private	237.5			- Change in Benchmark Reference - Comparability Adjustment - Discount for Size - Lack of Marketability - Volatility of Credit - Market Convention	(a) (b) (c) (d) (e) (f)	0.75% - 3.20% / 1.07% (0.54)% - (0.08)% / (0.37)% 0.50% - 0.50% / 0.50% 0.50% - 1.00% / 0.76% 0.50% - 7.72% / 1.60% Priced at Par
All Other Corporate Bonds - Public	328.4			- Change in Benchmark Reference - Comparability Adjustment - Discount for Size - Lack of Marketability - Volatility of Credit	(a) (b) (c) (d) (e)	(0.88)% - (0.88)% / (0.88)% (0.30)% - 1.00% / 0.10% (0.57)% - (0.57)% / (0.57)% 0.05% - 0.20% / 0.13% (0.30)% - 0.30% / 0.10%
Equity Securities - Private	4.0			- Market Convention	(f)	Priced at Cost or Owner's Equity
Embedded Derivative in Modified Coinsurance Arrangement	(77.5		)	- Projected Liability Cash Flows	(g)	Actuarial Assumptions

18

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

March 31, 2013

Note 3 - Fair Values of Financial Instruments - Continued

	December 31, 2012
	Fair Value			Unobservable Input		Range/Weighted Average
	(in millions of dollars)
Fixed Maturity Securities
States, Municipalities, and Political Subdivisions - Private	$	42.7		- Comparability Adjustment - Lack of Marketability - Volatility of Credit	(b) (d) (e)	0.25% - 0.25% / 0.25% 0.25% - 0.25% / 0.25% 0.15% - 0.15% / 0.15%
Public Utilities	17.4			- Comparability Adjustment	(b)	0.20% - 0.20% / 0.20%
Mortgage/Asset-Backed Securities - Private	0.5			- Discount for Size	(c)	5.74% - 5.84% / 5.81%
All Other Corporate Bonds - Private	391.8			- Change in Benchmark Reference - Comparability Adjustment - Discount for Size - Lack of Marketability - Volatility of Credit - Market Convention	(a) (b) (c) (d) (e) (f)	0.04% - 2.89% / 0.28% 1.48% - 1.48% / 1.48% 0.10% - 0.50% / 0.24% 0.10% - 1.00% / 0.46% (0.25)% -7.72% / 1.51% Priced at Par
All Other Corporate Bonds - Public	165.0			- Change in Benchmark Reference - Comparability Adjustment - Discount for Size - Lack of Marketability - Volatility of Credit - Market Convention	(a) (b) (c) (d) (e) (f)	0.25% - 0.25% / 0.25% (0.59)% - 1.00% / 0.27% 0.25% - 0.25% / 0.25% 0.20% - 0.30% / 0.24% (0.30)% - (0.30)% / (0.30)% Priced at Par
Equity Securities - Private	4.0			- Market Convention	(f)	Priced at Cost or Owner's Equity
Embedded Derivative in Modified Coinsurance Arrangement	(83.9		)	- Projected Liability Cash Flows	(g)	Actuarial Assumptions

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

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

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

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

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

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

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

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

19

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

March 31, 2013

Note 4 - Investments

Fixed Maturity Securities

At March 31, 2013 and December 31, 2012, 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, 2013
	Amortized Cost		Gross Unrealized Gain		Gross Unrealized Loss		Fair Value
	(in millions of dollars)
United States Government and Government Agencies and Authorities	$	1,027.3	$	309.2	$	1.4	$	1,335.1
States, Municipalities, and Political Subdivisions	1,550.8		308.5		5.5		1,853.8
Foreign Governments	1,197.3		260.5		—		1,457.8
Public Utilities	9,316.7		1,782.4		9.9		11,089.2
Mortgage/Asset-Backed Securities	1,767.1		275.6		0.5		2,042.2
All Other Corporate Bonds	22,740.4		3,907.7		29.0		26,619.1
Redeemable Preferred Stocks	33.0		6.3		—		39.3
Total Fixed Maturity Securities	$	37,632.6	$	6,850.2	$	46.3	$	44,436.5

	December 31, 2012
	Amortized Cost		Gross Unrealized Gain		Gross Unrealized Loss		Fair Value
	(in millions of dollars)
United States Government and Government Agencies and Authorities	$	1,020.9	$	329.0	$	1.1	$	1,348.8
States, Municipalities, and Political Subdivisions	1,498.4		316.2		7.8		1,806.8
Foreign Governments	1,280.4		226.6		—		1,507.0
Public Utilities	9,294.3		1,865.0		15.1		11,144.2
Mortgage/Asset-Backed Securities	1,927.9		289.1		0.5		2,216.5
All Other Corporate Bonds	22,696.6		4,245.3		31.5		26,910.4
Redeemable Preferred Stocks	33.0		6.3		—		39.3
Total Fixed Maturity Securities	$	37,751.5	$	7,277.5	$	56.0	$	44,973.0

As of March 31, 2013 and December 31, 2012, we held no fixed maturity securities for which a portion of an other-than-temporary impairment had previously been recognized in other comprehensive income.

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

	March 31, 2013
	Less Than 12 Months				12 Months or Greater
	Fair Value		Gross Unrealized Loss		Fair Value		Gross Unrealized Loss
	(in millions of dollars)
United States Government and Government Agencies and Authorities	$	—	$	—	$	6.2	$	1.4
States, Municipalities, and Political Subdivisions	91.0		1.8		45.3		3.7
Public Utilities	224.4		4.1		57.4		5.8
Mortgage/Asset-Backed Securities	2.5		—		3.8		0.5
All Other Corporate Bonds	843.4		14.9		323.8		14.1
Total Fixed Maturity Securities	$	1,161.3	$	20.8	$	436.5	$	25.5

20

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

March 31, 2013

Note 4 - Investments - Continued

	December 31, 2012
	Less Than 12 Months				12 Months or Greater
	Fair Value		Gross Unrealized Loss		Fair Value		Gross Unrealized Loss
	(in millions of dollars)
United States Government and Government Agencies and Authorities	$	—	$	—	$	6.5	$	1.1
States, Municipalities, and Political Subdivisions	30.8		0.9		42.1		6.9
Public Utilities	110.3		3.9		147.6		11.2
Mortgage/Asset-Backed Securities	4.4		—		3.8		0.5
All Other Corporate Bonds	441.3		7.0		396.8		24.5
Total Fixed Maturity Securities	$	586.8	$	11.8	$	596.8	$	44.2

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

	March 31, 2013
	Total Amortized Cost		Unrealized Gain Position				Unrealized Loss Position
			Gross Gain		Fair Value		Gross Loss		Fair Value
	(in millions of dollars)
1 year or less	$	1,059.7	$	23.6	$	1,040.1	$	0.2	$	43.0
Over 1 year through 5 years	5,927.8		654.8		6,501.5		1.7		79.4
Over 5 years through 10 years	9,756.5		1,548.7		10,799.5		8.0		497.7
Over 10 years	19,121.5		4,347.5		22,461.7		35.9		971.4
	35,865.5		6,574.6		40,802.8		45.8		1,591.5
Mortgage/Asset-Backed Securities	1,767.1		275.6		2,035.9		0.5		6.3
Total Fixed Maturity Securities	$	37,632.6	$	6,850.2	$	42,838.7	$	46.3	$	1,597.8

	December 31, 2012
	Total Amortized Cost		Unrealized Gain Position				Unrealized Loss Position
			Gross Gain		Fair Value		Gross Loss		Fair Value
	(in millions of dollars)
1 year or less	$	956.4	$	21.2	$	934.1	$	0.5	$	43.0
Over 1 year through 5 years	5,922.8		628.1		6,449.8		5.0		96.1
Over 5 years through 10 years	9,752.3		1,606.4		10,997.0		7.6		354.1
Over 10 years	19,192.1		4,732.7		23,200.2		42.4		682.2
	35,823.6		6,988.4		41,581.1		55.5		1,175.4
Mortgage/Asset-Backed Securities	1,927.9		289.1		2,208.3		0.5		8.2
Total Fixed Maturity Securities	$	37,751.5	$	7,277.5	$	43,789.4	$	56.0	$	1,183.6

At March 31, 2013, the fair value of investment-grade fixed maturity securities was $41,295.1 million, with a gross unrealized gain of $6,647.8 million and a gross unrealized loss of $27.8 million. The gross unrealized loss on investment-grade fixed maturity securities was 60.0 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.

21

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

March 31, 2013

Note 4 - Investments - Continued

At March 31, 2013, the fair value of below-investment-grade fixed maturity securities was $3,141.4 million, with a gross unrealized gain of $202.4 million and a gross unrealized loss of $18.5 million. The gross unrealized loss on below-investment-grade fixed maturity securities was 40.0 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, 2013, 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, 2013, we held 64 individual investment-grade fixed maturity securities and 33 individual below-investment-grade fixed maturity securities that were in an unrealized loss position, of which 15 investment-grade fixed maturity securities and 14 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

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.

22

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

March 31, 2013

Note 4 - Investments - Continued

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.

At March 31, 2013, we had non-binding commitments of $153.0 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, 2013, the carrying amount of our variable interest entity investments that are not consolidated under the provisions of GAAP was $431.7 million, comprised of $326.3 million of tax credit partnerships and $105.4 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 $75.7 million at March 31, 2013. 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 also had non-binding commitments of $107.8 million to fund certain private equity partnerships at March 31, 2013, the amount of which may or may not be funded.

23

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

March 31, 2013

Note 4 - Investments - Continued

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 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 and partnerships were $141.8 million and $6.7 million, respectively, as of March 31, 2013.  The bonds are reported as fixed maturity securities, and the partnerships are reported as other long-term investments in our consolidated balance sheets. At March 31, 2013, 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, 2013 and 2012.

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, 2013				December 31, 2012
	(in millions of dollars)
	Carrying		Percent of		Carrying		Percent of
	Amount		Total		Amount		Total
Property Type
Apartment	$	33.8	2.0	%	$	34.0	2.0	%
Industrial	518.0		29.9		513.4		30.0
Mixed	77.8		4.5		78.4		4.6
Office	730.6		42.2		713.4		41.6
Retail	370.2		21.4		373.5		21.8
Total	$	1,730.4	100.0	%	$	1,712.7	100.0	%

Region
New England	$	113.2	6.5	%	$	114.3	6.7	%
Mid-Atlantic	158.9		9.2		160.0		9.3
East North Central	233.1		13.5		224.7		13.1
West North Central	158.0		9.1		160.8		9.4
South Atlantic	437.8		25.3		440.9		25.7
East South Central	79.1		4.6		79.6		4.7
West South Central	157.8		9.1		159.5		9.3
Mountain	89.6		5.2		90.5		5.3
Pacific	302.9		17.5		282.4		16.5
Total	$	1,730.4	100.0	%	$	1,712.7	100.0	%

24

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

March 31, 2013

Note 4 - Investments - Continued

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

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 2013		December 31 2012
	(in millions of dollars)
Internal Rating
Aa	$	11.3	$	11.5
A	660.8		659.4
Baa	1,005.6		994.5
Ba	39.6		34.2
B	13.1		13.1
Total	$	1,730.4	$	1,712.7

Loan-to-Value Ratio
<= 65%	$	657.8	$	624.7
> 65% <= 75%	847.3		858.8
> 75% <= 85%	131.5		142.5
> 85%	93.8		86.7
Total	$	1,730.4	$	1,712.7

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 a 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 and the determination of whether a borrower can make the contractual payments are inherently subjective, and methodologies may vary depending on the circumstances specific to a 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.

25

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

March 31, 2013

Note 4 - Investments - Continued

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

	Three Months Ended March 31
	2013		2012
	(in millions of dollars)
Balance at Beginning of Year	$	1.5	$	1.5
Provision	—		0.5
Balance at End of Period	$	1.5	$	2.0

Impaired mortgage loans are as follows:

	March 31, 2013
	(in millions of dollars)
			Unpaid
	Recorded		Principal		Related
	Investment		Balance		Allowance
With No Related Allowance Recorded	$	4.3	$	4.3	$	—
With an Allowance Recorded	13.1		14.6		1.5
Total	$	17.4	$	18.9	$	1.5
	December 31, 2012
	(in millions of dollars)
			Unpaid
	Recorded		Principal		Related
	Investment		Balance		Allowance
With No Related Allowance Recorded	$	4.3	$	4.3	$	—
With an Allowance Recorded	13.1		14.6		1.5
Total	$	17.4	$	18.9	$	1.5

For the three months ended March 31, 2013 and 2012, our average investment in impaired mortgage loans was $17.4 million and $23.7 million, respectively. For each of the three months ended March 31, 2013 and 2012, we recognized $0.2 million of interest income on mortgage loans subsequent to impairment.

We had no troubled debt restructurings during the three months ended March 31, 2013. We had one loan foreclosure with a carrying amount of $4.2 million that qualified as a troubled debt restructuring during the three months ended March 31, 2012.

We had no realized losses on loan foreclosures for the three months ended March 31, 2013 and 2012, other than the initial impairment losses recognized prior to foreclosure.

For mortgage loans that are past due regarding principal and/or interest payments and for which collection of investment income is uncertain, we discontinue the accrual of investment income. At March 31, 2013 and December 31, 2012, we had no mortgage loans greater than 90 days past due for which we were still accruing interest income. At March 31, 2013 and December 31, 2012, we held one mortgage loan that was greater than 90 days past due and had a carrying value of $4.3 million.

At March 31, 2013, we had non-binding commitments of $48.2 million to fund certain commercial mortgage loans, the amount of which may or may not be funded.

26

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

March 31, 2013

Note 4 - Investments - Continued

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.

We account for all of our securities lending agreements and repurchase agreements as collateralized financings. As of March 31, 2013, the carrying amount of fixed maturity securities loaned to third parties under our securities lending program was $234.0 million, for which we received collateral in the form of cash and securities of $236.3 million and $6.5 million, respectively. As of December 31, 2012, the carrying amount of fixed maturity securities loaned to third parties under our securities lending program was $452.8 million, for which we received collateral in the form of cash and securities of $455.8 million and $14.5 million, respectively. We had no outstanding repurchase agreements at March 31, 2013 or December 31, 2012.

Offsetting of Financial Instruments

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

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

27

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

March 31, 2013

Note 4 - Investments - Continued

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

	Offsetting of Financial Assets and Derivative Assets
	March 31, 2013
	Gross				Net Amount of		Gross Amount Not
	Amount of		Gross Amount		Assets		Offset in Balance Sheet
	Recognized		Offset in		Presented in		Financial			Cash Collateral
	Assets		Balance Sheet		Balance Sheet		Instruments			Received			Net Amount
	(in millions of dollars)
Derivatives	$	62.1	$	—	$	62.1	$	(53.6	)	$	—		$	8.5
Securities Lending	234.0		—		234.0		—			(234.0		)	—
Total	$	296.1	$	—	$	296.1	$	(53.6	)	$	(234.0	)	$	8.5
	Offsetting of Financial Liabilities and Derivative Liabilities
	March 31, 2013
	Gross				Net Amount of		Gross Amount Not
	Amount of		Gross Amount		Liabilities		Offset in Balance Sheet
	Recognized		Offset in		Presented in		Financial			Cash Collateral
	Liabilities		Balance Sheet		Balance Sheet		Instruments			Pledged			Net Amount
	(in millions of dollars)
Derivatives	$	157.4	$	—	$	157.4	$	(117.7	)	$	(1.8	)	$	37.9
Securities Lending	236.3		—		236.3		(234.0		)	—			2.3
Total	$	393.7	$	—	$	393.7	$	(351.7	)	$	(1.8	)	$	40.2

	Offsetting of Financial Assets and Derivative Assets
	December 31, 2012
	Gross				Net Amount of		Gross Amount Not
	Amount of		Gross Amount		Assets		Offset in Balance Sheet
	Recognized		Offset in		Presented in		Financial			Cash Collateral
	Assets		Balance Sheet		Balance Sheet		Instruments			Received			Net Amount
	(in millions of dollars)
Derivatives	$	81.6	$	—	$	81.6	$	(72.9	)	$	—		$	8.7
Securities Lending	452.8		—		452.8		—			(452.8		)	—
Total	$	534.4	$	—	$	534.4	$	(72.9	)	$	(452.8	)	$	8.7
	Offsetting of Financial Liabilities and Derivative Liabilities
	December 31, 2012
	Gross				Net Amount of		Gross Amount Not
	Amount of		Gross Amount		Liabilities		Offset in Balance Sheet
	Recognized		Offset in		Presented in		Financial			Cash Collateral
	Liabilities		Balance Sheet		Balance Sheet		Instruments			Pledged			Net Amount
	(in millions of dollars)
Derivatives	$	170.5	$	—	$	170.5	$	(129.8	)	$	(1.8	)	$	38.9
Securities Lending	455.8		—		455.8		(452.8		)	—			3.0
Total	$	626.3	$	—	$	626.3	$	(582.6	)	$	(1.8	)	$	41.9

28

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

March 31, 2013

Note 4 - Investments - Continued

Net Investment Income

Net investment income reported in our consolidated statements of income is as follows:

	Three Months Ended March 31
	2013		2012
	(in millions of dollars)
Fixed Maturity Securities	$	589.9	$	595.5
Derivative Financial Instruments	7.7		6.3
Mortgage Loans	26.0		25.0
Policy Loans	3.7		3.6
Other Long-term Investments	7.7		3.2
Short-term Investments	0.8		1.2
Gross Investment Income	635.8		634.8
Less Investment Expenses	7.1		7.2
Less Investment Income on PFA Assets	4.0		4.1
Less Amortization of Tax Credit Partnerships	3.6		4.0
Net Investment Income	$	621.1	$	619.5

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
	2013			2012
	(in millions of dollars)
Fixed Maturity Securities
Gross Gains on Sales	$	6.6		$	5.9
Gross Losses on Sales	(5.5		)	(5.0		)
Other-Than-Temporary Impairment Loss	(0.8		)	—
Mortgage Loans and Other Invested Assets
Gross Gains on Sales	7.6			—
Impairment Loss	(1.0		)	(0.5		)
Embedded Derivative in Modified Coinsurance Arrangement	6.4			12.3
Other Derivatives	(0.3		)	—
Foreign Currency Transactions	(2.7		)	(0.3		)
Net Realized Investment Gain	$	10.3		$	12.4

Note 5 - Derivative Financial Instruments

Purpose of Derivatives

We are exposed to certain risks relating to our ongoing business operations. The primary risks managed by using derivative instruments are interest rate risk, risk related to matching duration for our assets and liabilities, foreign currency risk, and credit 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, forward contracts on specific fixed income securities, and credit default swaps. Transactions hedging interest rate risk are primarily associated with our individual and group long-term care and individual and group disability products. All other product portfolios are periodically reviewed to determine if hedging strategies would be appropriate for risk management purposes.

29

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

March 31, 2013

Note 5 - Derivative Financial Instruments - Continued

Derivatives designated as cash flow hedges and used to reduce our exposure to interest rate and duration risk 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. We use interest rate swaps to hedge the anticipated purchase of fixed maturity securities thereby protecting us from the potential adverse impact of declining interest rates on the associated policy reserves. We also use interest rate swaps to hedge the potential adverse impact of rising interest rates in anticipation of issuing fixed rate long-term debt.

• 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.

Derivatives designated as fair value hedges and used to reduce our exposure to interest rate and duration risk 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.

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

• 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.

• Foreign currency forward contracts are used to minimize foreign currency risks. A foreign currency forward is a derivative without an initial investment where we and the counterparty agree to exchange a specific amount of currencies, at a specific exchange rate, on a specific date. We have used these forward contracts to hedge the foreign currency risk associated with certain of the debt repayments of the U.S. dollar-denominated debt issued by one of our U.K. subsidiaries and to hedge the currency risk of certain foreign currency-denominated fixed maturity securities owned for diversification purposes.

Derivatives not designated as hedging instruments and used to reduce our exposure to credit losses on securities owned are as follows:

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

30

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

March 31, 2013

Note 5 - Derivative Financial Instruments - Continued

Derivative Risks

The basic types of risks associated with derivatives are market risk (that the value of the derivative will be adversely impacted by changes in the market, primarily the change in interest and exchange rates) and credit risk (that the counterparty will not perform according to the terms of the contract). The market risk of the derivatives should generally offset the market risk associated with the hedged financial instrument or liability. To help limit the credit exposure of the derivatives, we enter into master netting agreements with our counterparties whereby contracts in a gain position can be offset against contracts in a loss position. We also typically enter into bilateral, cross-collateralization agreements with our counterparties to help limit the credit exposure of the derivatives. These agreements require the counterparty in a loss position to submit acceptable collateral with the other counterparty in the event the net loss position meets or exceeds an agreed upon amount. Our current credit exposure on derivatives, which is limited to the value of those contracts in a net gain position less collateral held, was $8.5 million at March 31, 2013. We held no cash collateral from our counterparties as of March 31, 2013 and December 31, 2012. 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 $92.4 million and $108.6 million at March 31, 2013 and December 31, 2012, respectively. We had $1.8 million cash posted as collateral to our counterparties at March 31, 2013 and December 31, 2012.

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 $157.4 million and $170.5 million at March 31, 2013 and December 31, 2012, respectively.

Derivative Transactions

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		Credit Default		Forwards		Total
	(in millions of dollars)
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
Balance at December 31, 2012	$	174.0	$	508.8	$	750.0	$	—	$	—	$	1,432.8
Additions	—		—		—		70.0		24.0		94.0
Terminations	—		18.0		40.0		—		24.0		82.0
Balance at March 31, 2013	$	174.0	$	490.8	$	710.0	$	70.0	$	—	$	1,444.8

The following table summarizes the timing of anticipated settlements of interest rate swaps outstanding under our cash flow hedging programs at March 31, 2013, whereby we receive a fixed rate and pay a variable rate. The weighted average variable interest rates assume current market conditions.

	2013
	(in millions of dollars)
Notional Value	$	110.0
Weighted Average Receive Rate	6.71		%
Weighted Average Pay Rate	0.28		%

31

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

March 31, 2013

Note 5 - Derivative Financial Instruments - Continued

Cash Flow Hedges

As of March 31, 2013 and December 31, 2012, we had $110.0 million and $150.0 million, respectively, notional amount of forward starting interest rate swaps to hedge the anticipated purchase of fixed maturity securities and $490.8 million and $508.8 million, respectively, notional amount of open current and forward foreign currency swaps to hedge fixed income foreign currency-denominated securities.

For the three months ended March 31, 2013 and 2012, 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, 2013, we expect to amortize approximately $43.2 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, 2013. Fluctuations in fair values of these derivatives between March 31, 2013 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, 2013, we are hedging the variability of future cash flows associated with forecasted transactions through the year 2038.

Fair Value Hedges

As of March 31, 2013 and December 31, 2012, 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 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, 2013 and 2012, the change in fair value of the hedged fixed maturity securities attributable to the hedged benchmark interest rate resulted in a loss of $2.4 million and $1.7 million, respectively, with an offsetting gain on the related interest rate swaps.

As of March 31, 2013 and December 31, 2012, we had $600.0 million notional amount of receive fixed, pay variable interest rate swaps to hedge the changes in the fair value of certain fixed rate long-term debt. These swaps effectively convert the associated fixed rate long-term debt into floating rate debt and provide 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, 2013, the change in fair value of the hedged debt attributable to the hedged benchmark interest rate resulted in a gain of $4.1 million with an offsetting loss on the related interest rate swaps. 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 gain on the related interest rate swaps.

For the three months ended March 31, 2013 and 2012, 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.

32

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

March 31, 2013

Note 5 - Derivative Financial Instruments - Continued

Derivatives not Designated as Hedging Instruments

During the three months ended March 31, 2013, we purchased $70.0 million notional amount of single-name credit default swaps. We entered into these swaps in order to mitigate the credit risk associated with specific securities owned. Changes in the fair value of the derivative, together with the payment of periodic fees, are recognized in earnings as a component of net realized investment gain or loss during the period of change in fair value.

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. Changes in the fair value of the embedded derivative are recognized in earnings as a component of net realized investment gain or loss during the period of change in fair value.

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, 2013
	Asset Derivatives			Liability Derivatives
	Balance Sheet Location	Fair Value		Balance Sheet Location	Fair Value
	(in millions of dollars)
Designated as Hedging Instruments
Interest Rate Swaps	Other L-T Investments	$	59.6	Other Liabilities	$	31.2
Foreign Exchange Contracts	Other L-T Investments	2.5		Other Liabilities	125.5
Total		$	62.1		$	156.7
Not Designated as Hedging Instruments
Credit Default Swaps				Other Liabilities	$	0.7
Embedded Derivative in Modified Coinsurance Arrangement				Other Liabilities	77.5
Total					$	78.2

	December 31, 2012
	Asset Derivatives			Liability Derivatives
	Balance Sheet Location	Fair Value		Balance Sheet Location	Fair Value
	(in millions of dollars)
Designated as Hedging Instruments
Interest Rate Swaps	Other L-T Investments	$	76.5	Other Liabilities	$	31.7
Foreign Exchange Contracts	Other L-T Investments	5.1		Other Liabilities	138.8
Total		$	81.6		$	170.5
Not Designated as Hedging Instruments
Embedded Derivative in Modified Coinsurance Arrangement				Other Liabilities	$	83.9

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.

33

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

March 31, 2013

Note 5 - Derivative Financial Instruments - Continued

	Three Months Ended March 31, 2013
	Gain Recognized in OCI on Derivatives (Effective Portion)			Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)
	(in millions of dollars)
Interest Rate Swaps and Forwards	$	(2.2	)	$	10.0		(1)
Interest Rate Swaps	—			(0.4		)	(3)
Foreign Exchange Contracts	—			(1.7		)	(1)
Foreign Exchange Contracts	4.1			(6.7		)	(2)
Total	$	1.9		$	1.2

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

(2) Loss recognized in net realized investment gain

(3) Loss recognized in interest and debt expense

	Three Months Ended March 31, 2012
	Gain Recognized in OCI on Derivatives (Effective Portion)			Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)
	(in millions of dollars)
Interest Rate Swaps and Forwards	$	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

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

	Three Months Ended March 31
	2013			2012
	(in millions of dollars)
Credit Default Swaps	$	(0.3	)	$	—
Embedded Derivative in Modified Coinsurance Arrangement	6.4			12.3
Gain Recognized in Net Realized Investment Gain	$	6.1		$	12.3

34

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

March 31, 2013

Note 6 - Accumulated Other Comprehensive Income

After-tax accumulated other comprehensive income (loss) balances and related changes are as follows:

		Net Unrealized Gain on Securities			Net Gain on Cash Flow Hedges			Foreign Currency Translation Adjustment			Unrecognized Pension and Postretirement Benefit Costs			Total
		(in millions of dollars)
Balance at December 31, 2012		$	873.5		$	401.6		$	(72.6	)	$	(574.5	)	$	628.0
	Other Comprehensive Income (Loss) Before Reclassifications	(73.3		)	(1.2		)	(69.9		)	1.7			(142.7		)
	Amounts Reclassified from Accumulated Other Comprehensive Income or Loss	(7.8		)	(0.8		)	—			9.0			0.4
	Net Other Comprehensive Income (Loss)	(81.1		)	(2.0		)	(69.9		)	10.7			(142.3		)
Balance at March 31, 2013		$	792.4		$	399.6		$	(142.5	)	$	(563.8	)	$	485.7

The net unrealized gain on securities consists of the following components:

	March 31			December 31
	2013			2012			Change
	(in millions of dollars)
Fixed Maturity Securities	$	6,803.9		$	7,221.5		$	(417.6	)
Other Investments	72.5			92.8			(20.3		)
Deferred Acquisition Costs	(61.2		)	(67.0		)	5.8
Reserves for Future Policy and Contract Benefits	(5,979.7		)	(6,277.5		)	297.8
Reinsurance Recoverable	353.9			351.5			2.4
Deferred Income Tax	(397.0		)	(447.8		)	50.8
Total	$	792.4		$	873.5		$	(81.1	)

35

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

March 31, 2013

Note 6 - Accumulated Other Comprehensive Income - Continued

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

			Three Months Ended March 31, 2013
			(in millions of dollars)
Net Unrealized Gain on Securities
	Net Realized Investment Gain
		Gain on Disposals of Securities and Other Invested Assets	$	11.9
	Income Tax		4.1
	Total		$	7.8
Net Gain on Cash Flow Hedges
	Net Investment Income
		Gain on Interest Rate Swaps and Forwards	$	10.0
		Loss on Foreign Exchange Contracts	(1.7		)
	Net Realized Investment Gain
		Loss on Foreign Exchange Contracts	(6.7		)
	Interest and Debt Expense
		Loss on Interest Rate Swaps	(0.4		)
			1.2
	Income Tax		0.4
	Total		$	0.8
Unrecognized Pension and Postretirement Benefit Costs
	Other Expenses
		Amortization of Net Actuarial Loss	$	(14.9	)
		Amortization of Prior Service Credit	1.2
			(13.7		)
	Income Tax Benefit		(4.7		)
	Total		$	(9.0	)

36

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

March 31, 2013

Note 7 - Segment Information

Our reporting segments are comprised of Unum US, Unum UK, Colonial Life, Closed Block, and Corporate.

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

	Three Months Ended March 31
	2013			2012
	(in millions of dollars)
Unum US
Group Disability
Group Long-term Disability	$	392.7		$	395.5
Group Short-term Disability	131.0			117.7
Group Life and Accidental Death & Dismemberment
Group Life	302.2			293.6
Accidental Death & Dismemberment	30.9			28.3
Supplemental and Voluntary
Individual Disability - Recently Issued	120.1			118.4
Voluntary Benefits	162.8			158.5
	1,139.7			1,112.0
Unum UK
Group Long-term Disability	97.9			101.9
Group Life	31.0			52.7
Supplemental and Voluntary	14.9			16.1
	143.8			170.7
Colonial Life
Accident, Sickness, and Disability	184.8			180.2
Life	54.8			51.7
Cancer and Critical Illness	67.5			64.4
	307.1			296.3
Closed Block
Individual Disability	181.8			187.2
Long-term Care	158.8			155.2
All Other	(0.3		)	0.5
	340.3			342.9
Total	$	1,930.9		$	1,921.9

37

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

March 31, 2013

Note 7 - 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, 2013
Premium Income	$	1,139.7	$	143.8	$	307.1	$	340.3	$	—		$	1,930.9
Net Investment Income	235.7		30.8		39.7		313.1		1.8			621.1
Other Income	36.7		0.1		—		24.1		1.6			62.5
Operating Revenue	$	1,412.1	$	174.7	$	346.8	$	677.5	$	3.4		$	2,614.5
Operating Income (Loss)	$	208.1	$	31.3	$	75.4	$	27.3	$	(33.7	)	$	308.4
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

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
	2013			2012
	(in millions of dollars)
Operating Revenue by Segment	$	2,614.5		$	2,598.9
Net Realized Investment Gain	10.3			12.4
Total Revenue	$	2,624.8		$	2,611.3
Operating Income by Segment	$	308.4		$	309.2
Net Realized Investment Gain	10.3			12.4
Non-operating Retirement-related Loss	(14.9		)	(11.6		)
Income Tax	(91.2		)	(96.1		)
Net Income	$	212.6		$	213.9

Assets by segment are as follows:

	March 31		December 31
	2013		2012
	(in millions of dollars)
Unum US	$	19,097.5	$	19,391.2
Unum UK	3,664.8		3,975.8
Colonial Life	3,438.8		3,434.9
Closed Block	32,885.5		33,069.2
Corporate	2,524.8		2,365.0
Total	$	61,611.4	$	62,236.1

38

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

March 31, 2013

Note 8 - Pensions and Other Postretirement Benefits

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

	Three Months Ended March 31
	Pension Benefits
	U.S. Plans						Non U.S. Plans						OPEB
	2013			2012			2013			2012			2013			2012
	(in millions of dollars)
Service Cost	$	14.9		$	12.2		$	1.1		$	1.2		$	0.2		$	0.4
Interest Cost	21.9			21.1			2.1			2.1			2.0			2.4
Expected Return on Plan Assets	(25.5		)	(22.2		)	(3.0		)	(2.7		)	(0.2		)	(0.2		)
Amortization of:
Net Actuarial Loss	14.6			11.5			0.3			0.1			—			—
Prior Service Credit	—			(0.1		)	—			—			(1.2		)	(0.6		)
Total	$	25.9		$	22.5		$	0.5		$	0.7		$	0.8		$	2.0

We have no regulatory contribution requirements for our U.S. qualified defined benefit plan in 2013, and no voluntary contributions were made to the U.S. qualified defined benefit plan during the three months ended March 31, 2013. For our U.K. operation, which maintains a separate defined benefit plan, we made required contributions of $1.0 million, or approximately £0.6 million, during the three months ended March 31, 2013.

Note 9 - Stockholders' Equity and Earnings Per Common Share

Net income per common share is determined as follows:

	Three Months Ended March 31
	2013		2012
	(in millions of dollars, except share data)
Numerator
Net Income	$	212.6	$	213.9
Denominator (000s)
Weighted Average Common Shares - Basic	269,361.1		290,429.5
Dilution for Assumed Exercises of Stock Options and Nonvested Stock Awards	993.3		854.5
Weighted Average Common Shares - Assuming Dilution	270,354.4		291,284.0
Net Income Per Common Share
Basic	$	0.79	$	0.74
Assuming Dilution	$	0.79	$	0.73

We use the treasury stock method to account for the effect of outstanding stock options and nonvested stock awards 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 and/or the grant price of the nonvested stock awards.

The outstanding stock options have exercise prices ranging from $11.37 to $26.29, and the nonvested stock awards have grant prices ranging from $19.38 to $26.31.

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 0.4 million and 2.2 million shares of common stock for the three month periods ended March 31, 2013 and 2012, respectively.

39

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

March 31, 2013

Note 9 - Stockholders' Equity and Earnings Per Common Share - Continued

In July 2012 and February 2011, our board of directors authorized the repurchase of up to $750.0 million and $1.0 billion, respectively, of Unum Group's common stock. At December 31, 2012, no amounts were remaining for the purchase of shares under the February 2011 repurchase program. The July 2012 share repurchase program has an expiration date of January 2014, and the dollar value of shares remaining under the repurchase program was $454.9 million at March 31, 2013.

For the three month periods ended March 31, 2013 and 2012 and for the year ended December 31, 2012, we repurchased 3.7 million, 7.5 million, and 23.6 million shares, respectively. Common stock repurchases are 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 10 - 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.

40

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

March 31, 2013

Note 10 - Commitments and Contingent Liabilities - Continued

Miscellaneous Matters

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

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 class action alleges 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 the Employee Retirement Income Security Act (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. In February 2012, the District Court issued an opinion rejecting both of plaintiffs' principal theories and ordering judgment for us. At the same time, however, the District Court held that we breached a fiduciary duty to the beneficiaries by failing to pay rates comparable to the best rates available in the market for demand deposits. The District Court also certified a class of people who, during a certain period of time, were beneficiaries under certain group life insurance contracts that were part of ERISA employee welfare benefit plans and were paid death benefits using retained asset accounts.  The District Court authorized the parties to make an immediate appeal of its decision to the First Circuit Court of Appeals, and each of the parties sought leave for an early appeal on the issues raised by the District Court's rulings, but the First Circuit decided not to hear the appeal at this time. Therefore, the parties are required to wait until the proceedings in the District Court have concluded for further resolution of those issues. The First Circuit did not rule on or discuss the merits of the case. The case is proceeding in the District Court where notice to class members and discovery on the issue of damages have been completed. In February 2013, we filed a motion requesting the court reconsider its prior summary judgment ruling as well as a motion challenging the admissibility of the testimony of plaintiffs' expert witness. On April 10, 2013, the court denied our motion for reconsideration and reserved its ruling regarding the admissibility of testimony from plaintiffs' expert witness. The case has been placed on a trial list for June 2013.

In March 2011, we received a request for information from an independent third party as part of an examination on behalf of 32 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.

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.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

March 31, 2013

Note 10 - Commitments and Contingent Liabilities - Continued

In December 2012, State of West Virginia ex rel. John D. Perdue v. Provident Life and Accident Insurance Company and State of West Virginia ex rel. John D. Perdue v. Colonial Life & Accident Insurance Company were filed in the Circuit Court of Putnam County, West Virginia. These two separate complaints allege violations of the West Virginia Uniform Unclaimed Property Act by failing to identify and report all unclaimed insurance policy proceeds due to be escheated to West Virginia.  The complaints seek to examine company records and assess penalties and costs in an undetermined amount. On April 1, 2013, we filed motions to dismiss both complaints.

Summary

Various lawsuits against us, in addition to those discussed above, have arisen in the normal course of business. Further, state insurance regulatory authorities and other federal and state authorities regularly make inquiries and conduct investigations concerning our compliance with applicable insurance and other laws and regulations.

Given the complexity and scope of our litigation and regulatory matters, it is not possible to predict the ultimate outcome of all pending investigations or legal proceedings or provide reasonable estimates of potential losses, except if noted in connection with specific matters. It is possible that our results of operations or cash flows in a particular period could be materially affected by an ultimate unfavorable outcome of pending litigation or regulatory matters depending, in part, on our results of operations or cash flows for the particular period. We believe, however, that the ultimate outcome of all pending litigation and regulatory matters, after consideration of applicable reserves and rights to indemnification, should not have a material adverse effect on our financial position.

Note 11 - Debt

Short-term debt at March 31, 2013 consisted entirely of securities lending transactions.

During the three months ended March 31, 2013, we made principal payments of $15.0 million on our senior secured notes issued by Northwind Holdings, LLC.

In January 2013, we purchased and retired the outstanding principal of $62.5 million on our senior secured notes issued by Tailwind Holdings, LLC, resulting in a before-tax gain of $4.0 million.

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Review 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, 2013, and the related consolidated statements of income, comprehensive income, stockholders' equity and cash flows for the three-month periods ended March 31, 2013 and 2012. 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 (United States), 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.

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, 2012, and the related consolidated statements of income, comprehensive income, stockholders’ equity, and cash flows for the year then ended not presented herein and we expressed an unqualified audit opinion on those consolidated financial statements and included an explanatory paragraph for the adoption of amendments to the FASB Accounting Standards Codification resulting from Accounting Standards Update No. 2010-26, "Insurance (Topic 944): Accounting for Costs Associated with Acquiring or Renewing Insurance Contracts," in our report dated February 22, 2013.

/s/ ERNST & YOUNG LLP

Chattanooga, Tennessee

May 2, 2013

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

Introduction

Unum Group, a Delaware general business corporation, and its insurance and non-insurance subsidiaries, which collectively we refer to as the Company, operate in the United States, the United Kingdom, and, to a limited extent, in certain other countries. 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.

The benefits we provide help protect people from the financial hardship of illness, injury, or loss of life by providing support when it is needed most. 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 through the workplace.

Specifically, we offer group, individual, and voluntary benefits, either as stand-alone products or combined with other coverages, that help employers of all sizes attract and retain a stronger workforce while protecting the incomes and livelihood 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 financial stability. Working people and their families, particularly those at lower and middle incomes, are perhaps the most vulnerable in today's economy yet are often overlooked by many providers of financial 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 value 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. Although the occurrence of one or more of the risk factors discussed in our 2012 annual report on Form 10-K may cause our results to differ materially from our outlook, our business plan has been tested against a variety of economic scenarios, and we believe we can continue to meet the challenges presented by the current economic environment. 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, 2012.

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Executive Summary

Although we have confidence in our future, as we look to the remainder of 2013 we are maintaining a cautious view of the business environment given the continuing challenge of low interest rates and unfavorable economic conditions.  We intend to remain focused on profitable top line growth in select markets, continue our disciplined investment strategy, drive effectiveness in our operating performance, and generate consistent, sustainable capital available for deployment.  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 as a market leader over the long term.

A discussion of our operating performance and capital management follows.

Operating Performance and Capital Management

For the first quarter of 2013, we reported net income of $212.6 million, or $0.79 per diluted common share, compared to net income of $213.9 million, or $0.73 per diluted common share, in the same period of 2012. After-tax operating income, which excludes realized gains or losses and non-operating retirement-related gains or losses, was $215.6 million, or $0.80 per diluted common share, in the first quarter of 2013 compared to $213.2 million, or $0.73 per diluted common share, in the same period of 2012. Total operating revenue by segment increased slightly in the first quarter of 2013 relative to the first quarter of 2012, with marginal growth in premium income and net investment income. Total operating income by segment for the first quarter of 2013 was generally flat with the first quarter of 2012, with lower income in our Unum UK and Corporate segments offsetting the growth we achieved in our Unum US, Colonial Life, and Closed Block segments. Although our total operating income by segment was generally flat in the first quarter of 2013, we reported year-over-year earnings per share growth due to our capital management strategy of returning capital to shareholders through repurchases of our common stock. See additional information in "Consolidated Operating Results," "Reconciliation of Non-GAAP Financial Measures," and "Segment Results" contained herein in this Item 2.

Our Unum US segment reported an increase in segment operating income of slightly over one percent in the first quarter of 2013 compared to the same period of 2012, with growth in premium income, favorable risk results, and continued favorable expense management. Although Unum US premium income increased 2.5 percent in the first quarter of 2013 compared to the same period of 2012, the ongoing high levels of unemployment and the competitive environment continue to pressure our premium income growth, including the growth which normally occurs due to salary growth and growth in the number of employees covered under existing policies. The benefit ratio for our Unum US segment for the first quarter of 2013 was 70.9 percent compared to 72.5 percent in the same period of 2012, with overall favorable risk results in all of our major lines of business within the segment. Unum US experienced higher amortization of deferred acquisition costs for the supplemental and voluntary lines due to less favorable persistency in certain products and issue years. Unum US sales increased 1.3 percent in the first quarter of 2013 compared to the same period of 2012, with growth in the supplementary and voluntary line and the group large case market segment partially offset by lower sales in the group core market segment. Premium persistency overall declined relative to the first quarter of 2012.

Our Unum UK segment reported a decrease in segment operating income of £4.5 million, or 18.2 percent, in the first quarter of 2013 relative to the same period of 2012, with less favorable operating income in both group long-term disability and group life. Premium income declined £15.8 million, or 14.5 percent, in the first quarter of 2013 relative to the same period of 2012, due mainly to reinsurance agreements entered into effective January 1, 2013 to cede a portion of our group life business to other insurance companies. The reinsurance agreements will significantly decrease premium income and benefit payments for group life during 2013 but are expected to reduce volatility in this line of business. The benefit ratio for Unum UK was 69.5 percent in the first quarter of 2013 compared to 72.4 percent in the same period of 2012, with improved risk results in group life and supplemental and voluntary, partially offset by less favorable group long-term disability risk results. Unum UK sales decreased £9.1 million, or 46.4 percent, in the first quarter of 2013 compared to the same period of 2012, with the most significant year over year decline occurring in group life as we continue to execute our plans to reprice and reposition our group life business for better margins and greater stability. Premium persistency declined, as expected, primarily as a result of rate increases.

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Our Colonial Life segment reported an increase in segment operating income of 8.2 percent in the first quarter of 2013 compared to the same period of 2012, with higher operating revenue partially offset by less favorable risk results. Premium income grew 3.6 percent in the first quarter of 2013 compared to the same period of 2012. Also contributing to higher operating revenue in the first quarter of 2013 were higher bond call premiums and private equity partnership investment income, which can exhibit quarterly volatility. The benefit ratio for Colonial Life was slightly higher at 52.5 percent in the first quarter of 2013 compared to 52.1 percent in the same period of 2012. Colonial Life sales decreased 4.9 percent in the first quarter of 2013 compared to the same period of 2012, with decreases in the public sector and core commercial market segment sales partially offset by growth in large case commercial market segment sales. Persistency continues to be strong and was favorable for all product lines in the first quarter of 2013 relative to the same period of 2012.

Our Closed Block segment reported an increase in segment operating income of 77.3 percent in the first quarter of 2013 relative to the same period of 2012, with an increase in net investment income as well as favorable risk results in both the individual disability and long-term care lines of business.

Our investment portfolio continues to perform well, with slight growth in net investment income in the first quarter of 2013 compared to the same period of 2012. Our asset quality remains strong, with minimal realized investment losses from either sales or impairments and a net unrealized gain on our fixed maturity securities of $6.8 billion at March 31, 2013, compared to $7.2 billion at December 31, 2012.

We believe our capital and financial positions are strong. At March 31, 2013, 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 396 percent, consistent with the level at December 31, 2012 and within our target range of 375 percent to 400 percent. 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 $652 million at March 31, 2013 compared to $805 million at December 31, 2012 due primarily to debt repayments and repurchases of our common stock.

Further discussion is included in "Consolidated Operating Results," "Reconciliation of Non-GAAP Financial Measures," "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 2013.

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, 2012.

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.

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Consolidated Operating Results

(in millions of dollars)
	Three Months Ended March 31
	2013			% Change		2012
Revenue
Premium Income	$	1,930.9		0.5	%	$	1,921.9
Net Investment Income	621.1			0.3		619.5
Net Realized Investment Gain	10.3			(16.9	)	12.4
Other Income	62.5			8.7		57.5
Total Revenue	2,624.8			0.5		2,611.3
Benefits and Expenses
Benefits and Change in Reserves for Future Benefits	1,648.5			(0.9	)	1,662.9
Commissions	238.2			2.5		232.3
Interest and Debt Expense	37.1			4.5		35.5
Deferral of Acquisition Costs	(118.2		)	0.7		(117.4		)
Amortization of Deferred Acquisition Costs	123.8			24.5		99.4
Compensation Expense	197.6			(4.5	)	206.9
Other Expenses	194.0			6.8		181.7
Total Benefits and Expenses	2,321.0			0.9		2,301.3
Income Before Income Tax	303.8			(2.0	)	310.0
Income Tax	91.2			(5.1	)	96.1
Net Income	$	212.6		(0.6	)	$	213.9

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 periods. In periods when the pound strengthens, translating pounds into dollars increases current period results relative to the prior period. Our weighted average pound/dollar exchange rate was 1.550 and 1.571 for the three months ended March 31, 2013 and 2012, respectively. If the first quarter of 2012 results for our U.K. operations had been translated at the lower exchange rate of the first quarter of 2013, our operating revenue and operating income by segment in the first quarter of 2012 would have been lower by approximately $2.9 million and $0.5 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 for the first quarter of 2013 grew less than one percent relative to the same period of 2012. Although we experienced premium growth of 2.5 percent in our Unum US segment and 3.6 percent in our Colonial Life segment, the growth in each of these segments is less than our long-term expectations, as we continue to experience pressure on premium growth in many of our product lines due to the economy, lack of employment growth, and the competitive pricing environment. Partially offsetting the growth in premium income in Unum US and Colonial Life is a decline of approximately $25 million in the first quarter of 2013 relative to the same period last year due to the reinsurance agreements we entered into effective January 1, 2013 to cede a portion of our Unum UK group life business. Premium income also continues to decline, as expected, in our Closed Block segment. Further discussion of our premium income for each of our segments, as well as our outlook for future premium growth, is included in "Segment Results" as follows.

Net investment income was slightly higher in the first quarter of 2013 relative to the same period of 2012 due primarily to a higher level of invested assets, higher bond call premiums, and an increase in income from private equity partnership investments. These increases were partially offset by a decrease in yield on invested assets, lower prepayment income on mortgage backed securities, and lower income on our Unum UK inflation index-linked bonds.

We recognized net realized investment gains of $10.3 million and $12.4 million in the first quarter of 2013 and 2012, respectively. Included in these amounts is the change in the fair value of an embedded derivative in a modified coinsurance arrangement, which resulted in realized gains of $6.4 million and $12.3 million in the first quarter of 2013 and 2012, respectively. Impairment losses recognized during the first quarter of 2013 and 2012 were minimal.

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The benefit ratio was 85.4 percent in the first quarter of 2013 compared to 86.5 percent in the same period of 2012. The year-over-year decrease in the first quarter of 2013 was primarily attributable to more favorable risk results for our Unum US, Unum UK, and Closed Block segments. Risk results in Colonial Life for the first quarter of 2013 were slightly elevated compared to the same period of 2012. Further discussion of our line of business risk results for each of our segments is included in "Segment Results" as follows.

Interest and debt expense for the first quarter of 2013 was higher than the same period of 2012 due primarily to the issuance of $250.0 million of debt in August 2012, offset partially by lower interest expense on our floating rate debt and the purchase and retirement of the debt held by Tailwind Holdings, LLC (Tailwind Holdings) in January 2013.

The deferral of acquisition costs in the first quarter of 2013 was generally consistent with the level of 2012. The amortization of acquisition costs in the first quarter of 2013 was higher than in the same period of 2012 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.

Although we continue to focus on operating effectiveness and expense management, compensation and other expenses, in aggregate, were slightly higher in the first quarter of 2013 compared to the same period of 2012. The increase was due primarily to an increase in our non-operating retirement-related loss, which is excluded from our operating results by segment, and less favorable expense accruals in our Corporate segment.

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. The non-GAAP financial measures of "operating revenue," "operating income" or "operating loss," and "after-tax operating income" differ from revenue, income 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 realized investment gains or losses and non-operating retirement-related gains or losses as specified in the reconciliation below. We believe operating revenue and operating income or loss are better performance measures and better indicators of the revenue and profitability and underlying trends in our business. Realized investment gains or losses depend on market conditions and do not necessarily relate to decisions regarding the underlying business of our segments. Our investment focus is on investment income to support our insurance liabilities as opposed to the generation of realized investment gains or losses. Although we may experience realized investment gains or losses which will affect future earnings levels, a long-term focus is necessary to maintain profitability over the life of the business since our underlying business is long-term in nature, and we need to earn the interest rates assumed in calculating our liabilities. Certain components of the net periodic benefit cost for our pensions and other postretirement benefit plans, namely the amortization of prior period actuarial gains or losses, are primarily 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 or loss by segment provides investors with additional information for comparison and analysis of our operating results. Although we manage our non-operating retirement-related gains or losses separately from the operational performance of our business, these gains or losses impact the overall profitability of our company and will increase or decrease over time, depending on market conditions and the resulting impact on the actuarial gains or losses in our pensions and other postretirement benefit plans. We may at other times exclude certain other items from our discussion of financial ratios and metrics in order to enhance the understanding and comparability of our operational performance and the underlying fundamentals, but this exclusion is not an indication that similar items may not recur and does not replace net income or net loss as a measure of our overall profitability.

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A reconciliation of 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
	2013			2012
Operating Revenue by Segment	$	2,614.5		$	2,598.9
Net Realized Investment Gain	10.3			12.4
Total Revenue	$	2,624.8		$	2,611.3
Operating Income by Segment	$	308.4		$	309.2
Net Realized Investment Gain	10.3			12.4
Non-operating Retirement-related Loss	(14.9		)	(11.6		)
Income Tax	(91.2		)	(96.1		)
Net Income	$	212.6		$	213.9

	Three Months Ended March 31
	2013						2012
	(in millions)			per share *			(in millions)			per share *
After-tax Operating Income	$	215.6		$	0.80		$	213.2		$	0.73
Non-operating Retirement-related Loss, Net of Tax	(9.7		)	(0.04		)	(7.6		)	(0.03		)
Net Realized Investment Gain, Net of Tax	6.7			0.03			8.3			0.03
Net Income	$	212.6		$	0.79		$	213.9		$	0.73
* Assuming Dilution

Consolidated Sales Results

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

(in millions)
	Three Months Ended March 31
	2013		% Change		2012
Unum US	$	197.5	1.3	%	$	194.9
Unum UK	£	10.5	(46.4	)	£	19.6
Colonial Life	$	67.6	(4.9	)	$	71.1

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

Sales, persistency of the existing block of business, employment and salary growth, and the effectiveness of a renewal program are indicators of growth in premium income. Trends in new sales, as well as existing market share, also indicate the potential for growth in our respective markets and the level of market acceptance of price 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.

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Segment Results

Our reporting segments are comprised of the following: Unum US, Unum UK, Colonial Life, Closed Block, and Corporate. Financial information for each of our reporting segments is as follows.

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
	2013			% Change		2012
Operating Revenue
Premium Income	$	1,139.7		2.5	%	$	1,112.0
Net Investment Income	235.7			(1.2	)	238.6
Other Income	36.7			18.0		31.1
Total	1,412.1			2.2		1,381.7
Benefits and Expenses
Benefits and Change in Reserves for Future Benefits	807.9			0.2		806.2
Commissions	135.9			5.1		129.3
Interest and Debt Expense	0.1			(66.7	)	0.3
Deferral of Acquisition Costs	(64.0		)	3.4		(61.9		)
Amortization of Deferred Acquisition Costs	76.7			43.1		53.6
Other Expenses	247.4			(0.4	)	248.3
Total	1,204.0			2.4		1,175.8
Operating Income Before Income Tax and Net Realized Investment Gains and Losses	$	208.1		1.1		$	205.9
Operating Ratios (% of Premium Income):
Benefit Ratio	70.9		%			72.5		%
Other Expense Ratio	21.7		%			22.3		%
Before-tax Operating Income Ratio	18.3		%			18.5		%

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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
	2013			% Change		2012
Operating Revenue
Premium Income
Group Long-term Disability	$	392.7		(0.7	)%	$	395.5
Group Short-term Disability	131.0			11.3		117.7
Total Premium Income	523.7			2.0		513.2
Net Investment Income	141.5			(4.0	)	147.4
Other Income	27.8			18.3		23.5
Total	693.0			1.3		684.1
Benefits and Expenses
Benefits and Change in Reserves for Future Benefits	441.4			1.3		435.7
Commissions	43.6			7.9		40.4
Interest and Debt Expense	0.1			(66.7	)	0.3
Deferral of Acquisition Costs	(6.7		)	9.8		(6.1		)
Amortization of Deferred Acquisition Costs	5.2			23.8		4.2
Other Expenses	131.5			(2.5	)	134.9
Total	615.1			0.9		609.4
Operating Income Before Income Tax and Net Realized Investment Gains and Losses	$	77.9		4.3		$	74.7
Operating Ratios (% of Premium Income):
Benefit Ratio	84.3		%			84.9		%
Other Expense Ratio	25.1		%			26.3		%
Before-tax Operating Income Ratio	14.9		%			14.6		%
Premium Persistency:
Group Long-term Disability	88.9		%			91.7		%
Group Short-term Disability	89.8		%			90.5		%
Case Persistency:
Group Long-term Disability	88.2		%			87.8		%
Group Short-term Disability	86.7		%			86.6		%

Premium income increased in the first quarter of 2013 compared to the same period of 2012, with growth from prior year sales and rate increases partially offset by a decline in premium persistency for both long-term and short-term disability as well as lower sales for long-term disability during the first quarter of 2013. As previously discussed, high unemployment levels and the competitive environment continue to pressure our premium income growth, including growth from existing customers. Net investment income declined in the first quarter of 2013 relative to the same period of 2012 due to a decrease in the level of invested assets and a decline in yield on invested assets. Other income for the first quarter of 2013 included fees from administrative services products of $20.8 million compared to $20.6 million in the same period of 2012. Also included in other income for the first quarter of 2013 is a gain of $4.0 million on the purchase and retirement in January 2013 of the debt issued by Tailwind Holdings.

The benefit ratio was favorable in the first quarter of 2013 compared to the same period of 2012 due to improved risk results in group short-term disability resulting from favorable claim incidence and claim prevalence rates, partially offset by a slightly higher average weekly indemnity. Group long-term disability risk results were less favorable in the first quarter of 2013 relative to the first quarter of 2012 due primarily to the decrease in the discount rate which we implemented during the third quarter of 2012 for new claim incurrals, partially offset by favorable claim recoveries. Claim incidence rates for group long-term disability were stable in the first quarter of 2013 relative to the same prior year period.

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The deferral of acquisition costs was generally consistent quarter over quarter. The amortization of deferred acquisition costs was higher in the first quarter of 2013 compared to the same period of 2012 due primarily to growth in the level of the deferred asset. The other expense ratio was lower in the first quarter of 2013 relative to the same period of 2012 due primarily to higher premium income and our continued focus on operating effectiveness and expense management relative to our premium income levels.

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
	2013			% Change		2012
Operating Revenue
Premium Income
Group Life	$	302.2		2.9	%	$	293.6
Accidental Death & Dismemberment	30.9			9.2		28.3
Total Premium Income	333.1			3.5		321.9
Net Investment Income	35.7			2.3		34.9
Other Income	0.5			—		0.5
Total	369.3			3.4		357.3
Benefits and Expenses
Benefits and Change in Reserves for Future Benefits	235.3			1.6		231.7
Commissions	28.4			8.4		26.2
Deferral of Acquisition Costs	(5.7		)	11.8		(5.1		)
Amortization of Deferred Acquisition Costs	4.1			20.6		3.4
Other Expenses	49.3			1.2		48.7
Total	311.4			2.1		304.9
Operating Income Before Income Tax and Net Realized Investment Gains and Losses	$	57.9		10.5		$	52.4
Operating Ratios (% of Premium Income):
Benefit Ratio	70.6		%			72.0		%
Other Expense Ratio	14.8		%			15.1		%
Before-tax Operating Income Ratio	17.4		%			16.3		%
Premium Persistency:
Group Life	88.9		%			91.3		%
Accidental Death & Dismemberment	89.9		%			91.0		%
Case Persistency:
Group Life	87.7		%			87.3		%
Accidental Death & Dismemberment	88.0		%			87.4		%

Premium income was higher in the first quarter of 2013 compared to the same period of 2012 due primarily to sales growth, partially offset by a decline in premium persistency. Net investment income increased slightly in the first quarter of 2013 compared to the same period of 2012 due to an increase in the level of invested assets, partially offset by a decline in yield on invested assets and a decrease in the level of prepayment income on mortgage-backed securities.

The benefit ratio was lower in the first quarter of 2013 compared to the same period of 2012 due primarily to a lower average claim size, partially offset by a higher claim incidence rate. Commissions and the deferral of acquisition costs were higher in the first quarter of 2013 compared to the same period of 2012 due primarily to higher sales. The amortization of deferred acquisition costs was higher in the first quarter of 2013 compared to the same period of 2012 due primarily to growth in the level of the deferred asset. The other expense ratio was lower in the first quarter of 2013 compared to the same period of 2012 due primarily to higher premium income and our continued focus on operating effectiveness and expense management relative to our premium income levels.

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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
	2013			% Change		2012
Operating Revenue
Premium Income
Individual Disability - Recently Issued	$	120.1		1.4	%	$	118.4
Voluntary Benefits	162.8			2.7		158.5
Total Premium Income	282.9			2.2		276.9
Net Investment Income	58.5			3.9		56.3
Other Income	8.4			18.3		7.1
Total	349.8			2.8		340.3
Benefits and Expenses
Benefits and Change in Reserves for Future Benefits	131.2			(5.5	)	138.8
Commissions	63.9			1.9		62.7
Deferral of Acquisition Costs	(51.6		)	1.8		(50.7		)
Amortization of Deferred Acquisition Costs	67.4			46.5		46.0
Other Expenses	66.6			2.9		64.7
Total	277.5			6.1		261.5
Operating Income Before Income Tax and Net Realized Investment Gains and Losses	$	72.3		(8.2	)	$	78.8
Operating Ratios (% of Premium Income):
Benefit Ratios:
Individual Disability - Recently Issued	46.2		%			51.6		%
Voluntary Benefits	46.5		%			49.0		%
Other Expense Ratio	23.5		%			23.4		%
Before-tax Operating Income Ratio	25.6		%			28.5		%
Interest Adjusted Loss Ratio:
Individual Disability - Recently Issued	25.2		%			30.3		%
Premium Persistency:
Individual Disability - Recently Issued	90.6		%			90.3		%
Voluntary Benefits	77.2		%			79.9		%

Premium income was higher in the first quarter of 2013 compared to the same period of 2012 due primarily to continued sales growth for our individual disability and voluntary benefits products as well as stable premium persistency in the individual disability - recently issued product line. Premium persistency in the voluntary benefits product line declined relative to the prior year first quarter due to a high level of policy terminations in the first quarter of 2013. Net investment income was higher in the first quarter of 2013 compared to the same period of 2012 due to an increase in the level of invested assets and an increase in bond call premiums, partially offset by a decline in yield on invested assets and a decrease in the level of prepayment income on mortgage-backed securities.

The interest adjusted loss ratio for the individual disability - recently issued line of business was lower in the first quarter of 2013 compared to the same period of 2012 due primarily to the release of active life reserves related to the termination of a large inforce policy. Claim experience for the individual disability - recently issued product line during the first quarter of 2013 was stable and consistent with historical levels. The benefit ratio for voluntary benefits was lower in the first quarter of 2013 compared to the same period of 2012 driven by the release of active life reserves associated with policy terminations

during the first quarter of 2013.

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Commissions and the deferral of acquisition costs were slightly higher in the first quarter of 2013 compared to the same period of 2012 due to a higher level of sales. The amortization of deferred acquisition costs was higher in the first quarter of 2013 compared to the same period of 2012 due to unfavorable policy terminations relative to assumptions for certain issue years within certain of our product lines. The other expense ratio in the first quarter of 2013 was generally consistent with the first quarter of 2012 due to our continued focus on operating effectiveness and expense management relative to our premium income levels.

Sales

(in millions of dollars)
	Three Months Ended March 31
	2013		% Change		2012
Sales by Product
Group Disability, Group Life, and AD&D
Group Long-term Disability	$	31.1	(13.1	)%	$	35.8
Group Short-term Disability	15.8		17.9		13.4
Group Life	33.7		2.1		33.0
AD&D	3.1		6.9		2.9
Subtotal	83.7		(1.6	)	85.1
Supplemental and Voluntary
Individual Disability - Recently Issued	15.2		2.0		14.9
Voluntary Benefits	98.6		3.9		94.9
Subtotal	113.8		3.6		109.8
Total Sales	$	197.5	1.3		$	194.9
Sales by Market Sector
Group Disability, Group Life, and AD&D
Core Market (< 2,000 lives)	$	51.5	(11.8	)%	$	58.4
Large Case Market	32.2		20.6		26.7
Subtotal	83.7		(1.6	)	85.1
Supplemental and Voluntary	113.8		3.6		109.8
Total Sales	$	197.5	1.3		$	194.9

Unum US sales were slightly higher in the first quarter of 2013 compared to the same period of 2012, with growth in each of our product lines other than group long-term disability. By market sector, sales in our group core market segment were lower in the first quarter of 2013 relative to the same period of 2012, with declines in each of the product lines within this market segment other than short-term disability. The number of new accounts added in our group core market segment during the first quarter of 2013 was approximately 23 percent lower than the number of new accounts added during the same period of 2012. The decrease in core market sales and the number of new accounts was in part due to fewer sales opportunities in the small and mid-size employer market segment during the first quarter of 2013, which we believe may be temporarily attributable to employers' focus on the implementation of healthcare reform.

We continued our disciplined and opportunistic approach to sales growth in the large case market during the first quarter of 2013, and although the level of sales in this market segment was higher than in the same period of 2012, our new business pricing was within our guidelines. The increased sales in our group large case market segment were driven primarily by growth in sales to existing customers in the group short-term disability and group life and accidental death and dismemberment product lines. Our sales mix in the first quarter of 2013 was approximately 62 percent core market and 38 percent large case market.

Sales of voluntary benefits were higher in the first quarter of 2013 compared to the same period of 2012 with increases in both core and large case sales. The growth was driven more by sales to new customers rather than to existing customer accounts, although the number of new accounts added in the voluntary benefits product line was 7 percent lower in the first quarter of 2013 than the number of new accounts added during the same period of 2012. Sales in our individual disability - recently issued line of business, which are primarily concentrated in the multi-life market, were higher in the first quarter of 2013 compared to the same period of 2012, driven by growth in sales to new customers.

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We believe that the group core market and voluntary benefits market, which combined together are approximately 76 percent of our Unum US sales for the first quarter of 2013 and declined approximately 2 percent relative to the same period of 2012, represent significant growth opportunities. We will also continue to seek disciplined and opportunistic growth in the group large case and individual disability markets.  While in the short term we expect economic trends and our premium rate increases for certain of our group products to continue to pressure our sales growth, we believe we are well positioned to expand existing relationships and leverage our brand and market leadership.

Segment Outlook

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. Although we expect to continue to achieve marginal year-over-year growth in our premium income during 2013 and beyond, opportunities for further premium and sales growth are not expected to re-emerge until the economy improves and employment growth accelerates. Our net investment income may be impacted, either favorably or unfavorably, by fluctuations in bond calls and other types of miscellaneous net investment income. The current interest rate environment is putting near-term pressure on our profit margins by impacting net investment income and claim reserve discount rates. As a result of the continued low interest rate environment and the aging of insureds, we began initiating price increases for our group disability products during 2012 and will continue with the price increases throughout 2013. We anticipate that the benefit ratio for our group disability product line for 2013 will generally be consistent with the level of 2012, 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. The amortization of deferred acquisition costs may continue to be unfavorably impacted, particularly in our voluntary benefits product line, by policy terminations.

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

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Unum UK Segment

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

Operating Results

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

(in millions of dollars, except ratios)
	Three Months Ended March 31
	2013			% Change		2012
Operating Revenue
Premium Income
Group Long-term Disability	$	97.9		(3.9	)%	$	101.9
Group Life	31.0			(41.2	)	52.7
Supplemental and Voluntary	14.9			(7.5	)	16.1
Total Premium Income	143.8			(15.8	)	170.7
Net Investment Income	30.8			(15.6	)	36.5
Other Income	0.1			—		0.1
Total	174.7			(15.7	)	207.3
Benefits and Expenses
Benefits and Change in Reserves for Future Benefits	100.0			(19.1	)	123.6
Commissions	10.3			(2.8	)	10.6
Deferral of Acquisition Costs	(2.3		)	(36.1	)	(3.6		)
Amortization of Deferred Acquisition Costs	4.1			5.1		3.9
Other Expenses	31.3			(7.9	)	34.0
Total	143.4			(14.9	)	168.5
Operating Income Before Income Tax and Net Realized Investment Gains and Losses	$	31.3		(19.3	)	$	38.8
Operating Ratios (% of Premium Income):
Benefit Ratio	69.5		%			72.4		%
Other Expense Ratio	21.8		%			19.9		%
Before-tax Operating Income Ratio	21.8		%			22.7		%
Premium Persistency:
Group Long-term Disability	80.4		%			86.0		%
Group Life	83.5		%			84.7		%
Supplemental and Voluntary	85.8		%			86.7		%

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Foreign Currency Translation

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

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 weakens relative to the preceding period, as occurred during the first quarter of 2013 compared to the same period of 2012, translating pounds into dollars decreases current period results relative to the prior period.

(in millions of pounds, except ratios)
	Three Months Ended March 31
	2013			% Change		2012
Operating Revenue
Premium Income
Group Long-term Disability	£	63.1		(2.6	)%	£	64.8
Group Life	20.0			(40.3	)	33.5
Supplemental and Voluntary	9.7			(5.8	)	10.3
Total Premium Income	92.8			(14.5	)	108.6
Net Investment Income	19.8			(15.0	)	23.3
Total	112.6			(14.6	)	131.9
Benefits and Expenses
Benefits and Change in Reserves for Future Benefits	64.5			(17.9	)	78.6
Commissions	6.6			(1.5	)	6.7
Deferral of Acquisition Costs	(1.5		)	(34.8	)	(2.3		)
Amortization of Deferred Acquisition Costs	2.7			8.0		2.5
Other Expenses	20.1			(7.4	)	21.7
Total	92.4			(13.8	)	107.2
Operating Income Before Income Tax and Net Realized Investment Gains and Losses	£	20.2		(18.2	)	£	24.7
Weighted Average Pound/Dollar Exchange Rate	1.550					1.571

Premium income was lower in the first quarter of 2013 compared to the same period of 2012 due primarily to reinsurance agreements we entered into effective January 1, 2013 to cede a portion of our group life business. The reinsurance agreements will significantly decrease premium income and benefit payments for group life during 2013 but are expected to reduce volatility in this line of business. Premium growth in the first quarter of 2013 was also unfavorably impacted by continued pressure on premium persistency resulting from the initiation of premium rate increases, partially offset by an increase in premium income as a result of rate increases in existing customer accounts.

Net investment income declined in the first quarter of 2013 compared to the same period of 2012 due primarily to a decrease in invested asset yields, and a decrease in the level of invested assets, and lower income on inflation index-linked bonds. We invest in inflation index-linked bonds to support the claim reserves associated with certain of our group policies that provide for inflation-linked increases in benefits.

The benefit ratio was lower in the first quarter of 2013 compared to the same period of 2012 due to favorable risk results in both the group life and supplemental and voluntary lines of business. Group life risk results were favorable in the first quarter of 2013 compared to the same period of 2012 due to lower claim volumes. Benefits and change in reserves for future benefits for the group life line of business also declined in the first quarter of 2013 compared to the same period last year due to the reinsurance agreements. Supplemental and voluntary risk results were favorable in the first quarter of 2013 compared to the same period of 2012 due to lower claim incidence rates in the group critical illness and individual disability products. Group long-term disability risk results were less favorable in the first quarter of 2013 compared to the same period of 2012 due primarily to higher paid claims and reserve increases.

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The deferral of acquisition costs was lower in the first quarter of 2013 compared to the same period of 2012 due primarily to a lower level of sales. The amortization of deferred acquisition costs was generally consistent with the prior year. The other expense ratio was higher in the first quarter of 2013 compared to the same period of 2012 due primarily to lower premium income, partially offset by continued expense management initiatives.

Sales

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

(in millions)
	Three Months Ended March 31
	2013		% Change		2012
Sales by Product
Group Long-term Disability	$	10.9	(2.7	)%	$	11.2
Group Life	4.5		(75.0	)	18.0
Supplemental and Voluntary	1.0		(37.5	)	1.6
Total Sales	$	16.4	(46.8	)	$	30.8
Sales by Market Sector
Group Disability and Group Life
Core Market (< 500 lives)	$	8.5	(15.8	)	$	10.1
Large Case Market	6.9		(63.9	)	19.1
Subtotal	15.4		(47.3	)	29.2
Supplemental and Voluntary	1.0		(37.5	)	1.6
Total Sales	$	16.4	(46.8	)	$	30.8
Sales by Product
Group Long-term Disability	£	7.0	(1.4	)%	£	7.1
Group Life	2.9		(74.8	)	11.5
Supplemental and Voluntary	0.6		(40.0	)	1.0
Total Sales	£	10.5	(46.4	)	£	19.6
Sales by Market Sector
Group Disability and Group Life
Core Market (< 500 lives)	£	5.5	(14.1	)	£	6.4
Large Case Market	4.4		(63.9	)	12.2
Subtotal	9.9		(46.8	)	18.6
Supplemental and Voluntary	0.6		(40.0	)	1.0
Total Sales	£	10.5	(46.4	)	£	19.6

Sales in Unum UK's group long-term disability product line during the first quarter of 2013 were generally consistent with the level of sales in the first quarter of 2012 in both the core and large case market segments. Group life sales were lower in the first quarter of 2013 compared to the same period of 2012 in all market segments. Group life sales also declined relative to last year's first quarter due to our discontinuance of new sales of certain of our group life product lines during the third quarter of 2012. Supplemental and voluntary sales were lower in the first quarter of 2013 compared to the same period of 2012 due primarily to lower sales in our individual disability product line. We define the core market segment for Unum UK to be employee groups with fewer than 500 lives.

Segment Outlook

Our primary focus during 2013 is to stabilize profitability and improve growth over the medium term. Our shift in business mix and focus on premium rate increases for both group long-term disability and group life is expected to improve profitability. However, pressure on new sales and persistency is likely, and the low interest rate environment is expected to dampen overall earnings growth. We expect that the challenging economic and competitive pricing environment in the U.K. which has continued to negatively impact Unum UK's premium growth may continue in the near term. The current economic conditions may lead to a higher rate of claim incidence, lower levels of claim recoveries, or lower claim discount rates. We continuously monitor key indicators to assess our risks and attempt to adjust our business plans accordingly.

58

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

In our group life business, we continue to implement rate increases, and we discontinued offering new business for certain group life product lines in 2012. We expect group life premium income to decline in the near term as a result of these actions as well as a shift in business mix, but we believe profit margins will improve. As previously noted, we entered into reinsurance agreements effective January 1, 2013 to cede a portion of our group life business. These reinsurance agreements will significantly decrease premium income and benefit payments throughout 2013 but are expected to reduce volatility in our group life line of business.

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Colonial Life Segment

The Colonial Life segment includes insurance for accident, sickness, and disability products, life products, and cancer and critical illness products issued primarily by Colonial Life & Accident Insurance Company and marketed to employees at the workplace through an independent contractor agency sales force and brokers.

Operating Results

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

(in millions of dollars, except ratios)
	Three Months Ended March 31
	2013			% Change		2012
Operating Revenue
Premium Income
Accident, Sickness, and Disability	$	184.8		2.6	%	$	180.2
Life	54.8			6.0		51.7
Cancer and Critical Illness	67.5			4.8		64.4
Total Premium Income	307.1			3.6		296.3
Net Investment Income	39.7			11.5		35.6
Other Income	—			(100.0	)	0.1
Total	346.8			4.5		332.0
Benefits and Expenses
Benefits and Change in Reserves for Future Benefits	161.3			4.5		154.4
Commissions	64.0			0.2		63.9
Deferral of Acquisition Costs	(51.9		)	—		(51.9		)
Amortization of Deferred Acquisition Costs	43.0			2.6		41.9
Other Expenses	55.0			1.9		54.0
Total	271.4			3.5		262.3
Operating Income Before Income Tax and Net Realized Investment Gains and Losses	$	75.4		8.2		$	69.7
Operating Ratios (% of Premium Income):
Benefit Ratio	52.5		%			52.1		%
Other Expense Ratio	17.9		%			18.2		%
Before-tax Operating Income Ratio	24.6		%			23.5		%
Persistency:
Accident, Sickness, and Disability	75.8		%			74.1		%
Life	85.5		%			84.9		%
Cancer and Critical Illness	84.1		%			83.6		%

Premium income increased in the first quarter of 2013 relative to the same period of 2012 due primarily to continued strong persistency. Net investment income was higher in the first quarter of 2013 compared to the same period of 2012 primarily due to an increase in income from bond call premiums and private equity partnership investments, as well as continued growth in the level of invested assets.

The benefit ratio was slightly higher in the first quarter of 2013 compared to the same period of 2012, with less favorable claim experience in both the cancer and disability product lines mostly offset by improved risk experience in our life line of business.

In the first quarter of 2013, commissions and the deferral and amortization of acquisition costs were generally consistent with the same period of 2012.The other expense ratio was lower in the first quarter of 2013 compared to the same period of 2012 due primarily to higher premium income and a continued focus on expense management.

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Sales

(in millions of dollars)
	Three Months Ended March 31
	2013		% Change		2012
Sales by Product
Accident, Sickness, and Disability	$	43.9	(5.6	)%	$	46.5
Life	13.5		(2.2	)	13.8
Cancer and Critical Illness	10.2		(5.6	)	10.8
Total Sales	$	67.6	(4.9	)	$	71.1
Sales by Market Sector
Commercial
Core Market (< 1,000 lives)	$	50.8	(3.8	)%	$	52.8
Large Case Market	5.7		5.6		5.4
Subtotal	56.5		(2.9	)	58.2
Public Sector	11.1		(14.0	)	12.9
Total Sales	$	67.6	(4.9	)	$	71.1

Colonial Life's sales were lower in the first quarter of 2013 relative to the same period of 2012, with decreases in both new and existing account sales. Commercial market sales declined in the first quarter of 2013 compared to the same period of 2012, driven by a decline in sales in our core commercial market sector, which we define as accounts with fewer than 1,000 lives. Large case commercial market sector sales increased relative to the prior year first quarter. Total public sector market sales declined in the first quarter of 2013 compared to the first quarter of 2012. The number of new accounts decreased almost 17 percent in the first quarter of 2013 compared to the same period of 2012, while the average new case size was approximately 12 percent higher.

Segment Outlook

Current economic conditions continue to affect employment growth and buying conditions which, in turn, impact sales and premium growth. While lower than expected sales presents a challenge in the near term, we believe proper execution of our growth strategy and a gradual improvement in the economy will deliver sales and premium growth that are in line with long-term expectations. We see the continuing U.S. economic conditions and the increasing competition in the voluntary market as external risks to achievement of our business plans. We continuously monitor key indicators to assess our risks and attempt to adjust our business plans accordingly.

Premium growth has remained positive during the first quarter of 2013, due in part to strong persistency, and we expect our sales momentum to improve during the remainder of 2013. We expect volatility in net investment income to continue in 2013 as a result of fluctuations in bond calls and other types of miscellaneous net investment income. Periods of economic downturns have historically had minimal impact on the risk results of Colonial Life, due primarily to a diversified product portfolio that is designed with short duration, indemnity benefits.  We believe that strong profit margins will continue, and we expect our overall benefit ratio in 2013 to be generally consistent with the 2012 level.

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

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Closed Block Segment

The Closed Block segment consists of individual disability, group and individual long-term care, and certain other insurance products no longer actively marketed. The individual disability line of business in this segment generally consists of policies we sold prior to the mid 1990s and entirely discontinued selling in 2004, other than update features contractually allowable on existing policies. We discontinued offering group long-term care in 2012 and individual long-term care in 2009. Other insurance products include 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
	2013			% Change		2012
Operating Revenue
Premium Income
Individual Disability	$	181.8		(2.9	)%	$	187.2
Long-term Care	158.8			2.3		155.2
All Other	(0.3		)	N.M.		0.5
Total Premium Income	340.3			(0.8	)	342.9
Net Investment Income	313.1			3.8		301.6
Other Income	24.1			(6.9	)	25.9
Total	677.5			1.1		670.4
Benefits and Expenses
Benefits and Change in Reserves for Future Benefits	579.3			0.1		578.7
Commissions	28.0			(1.8	)	28.5
Interest and Debt Expense	2.2			(18.5	)	2.7
Other Expenses	40.7			(9.8	)	45.1
Total	650.2			(0.7	)	655.0
Operating Income Before Income Tax and Net Realized Investment Gains and Losses	$	27.3		77.3		$	15.4
Interest Adjusted Loss Ratios:
Individual Disability	81.5		%			83.1		%
Long-term Care	89.5		%			91.2		%
Operating Ratios (% of Premium Income):
Other Expense Ratio	12.0		%			13.2		%
Before-tax Operating Income Ratio	8.0		%			4.5		%
Premium Persistency:
Individual Disability	92.5		%			92.9		%
Long-term Care	95.5		%			95.9		%

Total premium income decreased slightly in the first quarter of 2013 compared to the same period of 2012, with lower individual disability premium income mostly offset by higher long-term care premium income. The decrease in individual disability premium income was due to the run-off of this closed line of business, driven by expected policy terminations and maturities. The increase in long-term care premium income was due to issuances of group long-term care certificates on inforce cases and the implementation of rate increases on certain of our long-term care policies.

We continue to file requests with various state insurance departments for premium rate increases on certain of our individual and group long-term care policies. The rate increases reflect current interest rates and claim experience, higher expected future claims, persistency, and other factors related to pricing 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.

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Net investment income was higher in the first quarter of 2013 compared to the same period of 2012 due to higher asset levels, partially offset by a decrease in income from bond calls. Other income, which includes the underlying results of certain blocks of reinsured business and the net investment income of portfolios held by those ceding companies to support the block we have reinsured, was lower in the first quarter of 2013 compared to the same period of 2012 due to lower investment income in the portfolios held by the ceding companies.

Individual disability risk results for the first quarter of 2013 were favorable compared to the same period of 2012 due to lower submitted claims. Long-term care risk results were favorable in the first quarter of 2013 compared to the same period of 2012 due to a lower level of paid claims as a result of favorable recoveries and mortality.

Interest and debt expense in the first quarter of 2013 was lower than the same period of 2012 due to principal repayments on the outstanding debt issued by Northwind Holdings, LLC (Northwind Holdings). The other expense ratio was lower in the first quarter of 2013 compared to the same period of 2012 due primarily to a decrease in selling and underwriting costs due to our discontinuance of the sale of group long-term care in 2012 and our continued focus on operating effectiveness and expense management.

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 this volatility in interest income will be offset by commensurate changes in the interest expense on our individual disability floating rate debt.

We expect that operating revenue and income for this segment will continue to decline over time as these closed blocks of business wind down, although we do expect additional premium income associated with long-term care rate increases. We also expect a small amount of group long-term care certificates to continue to be issued where we are required to do so under the terms of existing group policies. Profitability of our long-tailed products is affected by claims experience related to mortality and morbidity, investment returns, and persistency.  We believe that the interest adjusted loss ratios for the individual disability and long-term care lines of business will be relatively flat over the long term, but these product lines may experience quarterly volatility, particularly in the near-term for our long-term care product lines as our claim block matures. Claim resolution rates, which measure the resolution of claims from recovery, deaths, settlements, and benefit expirations, are very sensitive to operational and external factors and can be volatile. Our claim resolution rate assumption used in determining reserves is our expectation of the resolution rate we will experience over the life of the block of business and will vary from actual experience in any one period. It is possible that variability in any of our reserve assumptions, including, but not limited to, interest rates, mortality, morbidity, and persistency, could result in a material impact on our reserve levels, including adjustments to reserves previously established under loss recognition. 

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Corporate Segment

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

Operating Results

(in millions of dollars)
	Three Months Ended March 31
	2013			% Change		2012
Operating Revenue
Net Investment Income	$	1.8		(75.0	)%	$	7.2
Other Income	1.6			N.M.		0.3
Total	3.4			(54.7	)	7.5
Expenses
Interest and Debt Expense	34.8			7.1		32.5
Other Expenses	2.3			N.M.		(4.4		)
Total	37.1			32.0		28.1
Operating Loss Before Non-operating Retirement-related Loss, Income Tax, and Net Realized Investment Gains and Losses	$	(33.7	)	(63.6	)	$	(20.6	)
N.M. = not a meaningful percentage

Net investment income was lower in the first quarter of 2013 compared to the same period of 2012 due to a decrease in investment income attributable to tax credit partnerships, lower short-term interest rates, and a decrease in yield on assets, partially offset by higher bond call premiums. 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 was higher in the first quarter of 2013 compared to the same period of 2012 due primarily to the issuance of $250.0 million senior notes in August 2012, partially offset by a lower rate of interest on floating rate debt. Other expenses were higher in the first quarter of 2013 compared to the same period of 2012 due primarily to less favorable expense accruals.

Segment Outlook

We expect the quality of our investment portfolio to remain strong. The negative impact on net investment income due to the higher level of investment in tax credit partnerships may be such that net investment income for our Corporate segment could be negatively impacted, resulting in a higher operating segment loss for Corporate. However, this would be offset by a lower income tax rate due to the tax benefits recognized as a result of these investments. We are currently holding capital at our insurance subsidiaries and holding companies at levels that exceed our long-term requirements. We expect to continue to generate excess capital on an annual basis through our statutory earnings. While we intend to maintain our disciplined approach to risk management, we believe we are well positioned with substantial flexibility to preserve our capital strength and at the same time explore opportunities to deploy the excess capital that is generated each period.

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Investments

Overview

Investment activities are an integral part of our business, and profitability is significantly affected by investment results. We segment our invested assets into portfolios that support our various product lines. Generally, our investment strategy for our portfolios is to match the 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 what we believe to be 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.

For information on our valuation of investments and our formal investment policy, including our overall quality and diversification objectives, see "Investments" in Part I, Item 1 and "Critical Accounting Estimates" and "Investments" in Part II, Item 7 of our annual report on Form 10-K for the year ended December 31, 2012.

Investment Results

Net investment income was higher in the first quarter of 2013 relative to the same period of 2012 due primarily to a higher level of invested assets, higher bond call premiums, and an increase in income from private equity partnership investments. These increases were partially offset by a decrease in yield on invested assets, lower prepayment income on mortgage backed securities, and lower income on our Unum UK inflation index-linked bonds.

The duration weighted book yield on the fixed income securities in our investment portfolio was 6.41 percent as of March 31, 2013, compared to a yield of 6.47 percent as of December 31, 2012. 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.  To assess the impact of a duration mismatch which may occur under the different interest rate scenarios, 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.

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

(in millions of dollars)
	Three Months Ended March 31
	2013			2012
Fixed Maturity Securities
Gross Gains on Sales	$	6.6		$	5.9
Gross Losses on Sales	(5.5		)	(5.0		)
Other-Than-Temporary Impairment Loss	(0.8		)	—
Mortgage Loans and Other Invested Assets
Gross Gains on Sales	7.6			—
Impairment Loss	(1.0		)	(0.5		)
Embedded Derivative in Modified Coinsurance Arrangement	6.4			12.3
Other Derivatives	(0.3		)	—
Foreign Currency Transactions	(2.7		)	(0.3		)
Net Realized Investment Gain	$	10.3		$	12.4

We had no individual realized investment losses of $10.0 million or greater from either other-than-temporary impairments or the sale of fixed-maturity securities during the first quarter of 2013 or 2012.

Embedded Derivative in a Modified Coinsurance Arrangement

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 2013 and 2012 resulted primarily from a change in credit spreads in the overall investment market. The fair value of this embedded derivative was $(77.5) million at March 31, 2013, compared to $(83.9) million at December 31, 2012, 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, 2013

(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	$	2,597.1	$	291.4	$	190.1	$	9.7	$	2,407.0	$	301.1
Capital Goods	3,900.6		535.1		184.7		2.6		3,715.9		537.7
Communications	2,981.2		493.6		133.5		4.4		2,847.7		498.0
Consumer Cyclical	1,204.5		169.6		49.6		0.2		1,154.9		169.8
Consumer Non-Cyclical	5,938.1		916.5		227.9		3.8		5,710.2		920.3
Energy (Oil & Gas)	3,894.9		681.6		93.0		2.0		3,801.9		683.6
Financial Institutions	3,550.1		401.0		124.9		3.5		3,425.2		404.5
Mortgage/Asset-Backed	2,042.2		275.1		6.3		0.5		2,035.9		275.6
Sovereigns	1,457.8		260.5		—		—		1,457.8		260.5
Technology	1,118.6		136.5		163.5		2.8		955.1		139.3
Transportation	1,434.0		253.4		—		—		1,434.0		253.4
U.S. Government Agencies and Municipalities	3,188.9		610.8		142.5		6.9		3,046.4		617.7
Public Utilities	11,089.2		1,772.5		281.8		9.9		10,807.4		1,782.4
Redeemable Preferred Stocks	39.3		6.3		—		—		39.3		6.3
Total	$	44,436.5	$	6,803.9	$	1,597.8	$	46.3	$	42,838.7	$	6,850.2

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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, 2013 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, 2013. We held no securities at March 31, 2013 with a gross unrealized loss of $10.0 million or greater.

Unrealized Loss on Investment-Grade Fixed Maturity Securities

Length of Time in Unrealized Loss Position

(in millions of dollars)
	2013		2012
	March 31		December 31		September 30		June 30		March 31
Fair Value < 100% >= 70% of Amortized Cost
<= 90 days	$	9.7	$	3.9	$	0.7	$	11.2	$	15.6
> 90 <= 180 days	6.3		0.4		0.4		4.1		7.1
> 180 <= 270 days	0.4		0.4		0.9		0.7		9.6
> 270 days <= 1 year	0.1		0.3		—		7.8		2.2
> 1 year <= 2 years	0.5		0.2		9.3		31.9		19.3
> 2 years <= 3 years	3.3		5.9		8.9		0.2		0.2
> 3 years	7.5		12.3		17.8		28.8		34.0
Total	$	27.8	$	23.4	$	38.0	$	84.7	$	88.0

Unrealized Loss on Below-Investment-Grade Fixed Maturity Securities

Length of Time in Unrealized Loss Position

(in millions of dollars)
	2013		2012
	March 31		December 31		September 30		June 30		March 31
Fair Value < 100% >= 70% of Amortized Cost
<= 90 days	$	3.0	$	0.3	$	4.1	$	7.6	$	4.8
> 90 <= 180 days	0.4		1.4		3.9		6.2		9.5
> 180 <= 270 days	0.6		2.6		5.4		4.4		7.9
> 270 days <= 1 year	0.3		2.5		3.9		3.0		6.5
> 1 year <= 2 years	4.9		6.8		4.5		17.8		15.7
> 2 years <= 3 years	1.0		6.2		9.4		8.2		—
> 3 years	8.0		12.5		20.7		35.6		24.6
Sub-total	18.2		32.3		51.9		82.8		69.0
Fair Value < 70% >= 40% of Amortized Cost
> 3 years	0.3		0.3		1.1		0.3		0.4
Total	$	18.5	$	32.6	$	53.0	$	83.1	$	69.4

At March 31, 2013, 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, 2013, we held $211.6 million fair value ($200.1 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.

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At March 31, 2013, our mortgage/asset-backed securities had an average life of 3.93 years, effective duration of 3.56 years, and a weighted average credit rating of Aa1. The mortgage/asset-backed securities are valued on a monthly basis using valuations supplied by the brokerage firms that are dealers in these securities as well as independent pricing services. One of the risks involved in investing in mortgage/asset-backed securities is the uncertainty of the timing of cash flows from the underlying loans due to prepayment of principal with the possibility of reinvesting the funds in a lower interest rate environment. We use models which incorporate economic variables and possible future interest rate scenarios to predict future prepayment rates. The timing of prepayment cash flows may also cause volatility in our recognition of investment income. We recognize investment income on these securities using a constant effective yield based on projected prepayments of the underlying loans and the estimated economic life of the securities.  Actual prepayment experience is reviewed periodically, and effective yields are recalculated when differences arise between prepayments originally projected and the actual prepayments received and currently projected.  The effective yield is recalculated on a retrospective basis, and the adjustment is reflected in net investment income.

We have no exposure to subprime mortgages, "Alt-A" loans, or collateralized debt obligations in our investment portfolios. We have not invested in mortgage-backed derivatives, such as interest-only, principal-only, or residuals, where market values can be highly volatile relative to changes in interest rates. The credit quality of our mortgage-backed securities portfolio has not been negatively impacted by the issues in the market concerning subprime mortgage loans. The change in value of our mortgage-backed securities portfolio has moved in line with that of prime agency-backed mortgage-backed securities.

As of March 31, 2013, the amortized cost and fair value of our below-investment-grade fixed maturity securities was $2,957.5 million and $3,141.4 million, respectively. Below-investment-grade securities are inherently more risky than investment-grade securities since the risk of default by the issuer, by definition and as exhibited by bond rating, is higher. Also, the secondary market for certain below-investment-grade issues can be highly illiquid. Additional downgrades may occur, but we do not anticipate any liquidity problems resulting from our investments in below-investment-grade securities, nor do we expect these investments to adversely affect our ability to hold our other investments to maturity.

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

Our investments are chosen for specific portfolio management purposes, including asset and liability management and portfolio diversification across geographic lines and sectors to minimize non-market risks. In our approach to investing in fixed maturity securities, specific investments within approved countries and industry sectors are evaluated for their market position and specific strengths and potential weaknesses.  For each security, we consider the political, legal and financial environment of the sovereign entity in which an issuer is domiciled and operates. The country of domicile is based on consideration of the issuer's headquarters, in addition to location of the assets and the country in which the majority of sales and earnings are derived.  We continually evaluate our foreign investment risk exposure, including that within certain countries in the European Union, specifically Greece, Ireland, Italy, Portugal, and Spain. Our monitoring is heightened for investments in these specific countries due to our concerns over the current economic and political environments as well as the banking crisis, and we believe these investments are more vulnerable to potential credit problems.  We have neither direct nor indirect exposure to sovereign debt of any other countries for which we believe there is a heightened risk of sovereign default.

We do not have foreign currency risk, as the cash flows from these investments are either denominated in currencies or hedged into currencies to match the related liabilities. We have no direct exposure to sovereign debt of these countries and have not used credit derivatives to hedge our exposure or to sell credit protection.

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European Fixed Maturity Securities Exposure - By Country

As of March 31, 2013

(in millions of dollars)
	Fair Value		Amortized Cost
Greece	$	54.4	$	50.1
Ireland	86.2		81.9
Italy	237.5		230.6
Portugal	48.3		45.6
Spain	241.1		220.9
Total	$	667.5	$	629.1

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, 2013. The company aggregates cash and manages its debt payments outside the country in which it is domiciled, which we believe enables the company to place low reliance on the banking system of Greece. The company intends to change its domicile to Switzerland, pending required shareholder approval. As of March 31, 2013, this company was current on its obligations to us, and we believe it will continue to meet its debt obligations.

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, 2013, all of our Irish investments werecurrent on their obligations to us, and we believe they will continue to meet their debt obligations.  For those securities in an unrealized loss position, 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, 2013.

Italy

We have no direct exposure to Italian financial institutions.  We believe there are risks associated with the debt sustainability of Italy given its political and recessionary pressures. As of March 31, 2013, all of our Italian investments were current on their obligations to us, and we believe they will continue to meet their debt obligations.  For those securities in an unrealized loss position, 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, 2013.

Portugal

We have no direct exposure to Portuguese financial institutions.  In May 2011, Portugal received a support package valued at €78 billion from the International Monetary Fund/European Union.  We believe there is risk that Portugal will be unable to achieve the deficit reduction targets set out in this loan agreement, and future aid may be required. As of March 31, 2013, our singular holding domiciled in Portugal is a geographically diversified utility company that was downgraded to below-investment-grade during the first quarter of 2012. As of March 31, 2013, this company was current on its obligations to us, and we believe it will continue to meet its debt obligations.

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Spain

We have no direct exposure to Spanish financial institutions, although we do own fixed maturity securities of a certain United Kingdom subsidiary of a Spanish financial institution. We believe there are risks associated with Spain's high unemployment, large budget deficit, banking sector problems, recessionary pressures, and potential regional secession issues. All but one of our Spanish domiciled securities were rated investment-grade as of March 31, 2013, and all were current on their obligations to us. We believe they will continue to have the ability to meet their debt obligations. For those securities in an unrealized loss position, 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, 2013.

Risk Management

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

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

Mortgage Loans

Our mortgage loan portfolio was $1,730.4 million and $1,712.7 million on an amortized cost basis at March 31, 2013 and December 31, 2012, 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, 2013 and December 31, 2012 which were considered impaired and were carried at the estimated net realizable value of $17.4 million, net of a valuation allowance of $1.5 million.

Derivative Financial Instruments

We use derivative financial instruments primarily to manage reinvestment risk, duration, currency, and credit 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, forward contracts on specific fixed income securities, and credit default swaps. Our current credit exposure on derivatives, which is limited to the value of those contracts in a net gain position less collateral held, was $8.5 million at March 31, 2013. We held no cash collateral from our counterparties at March 31, 2013. The carrying value of cash and fixed maturity securities posted as collateral to our counterparties was $1.8 million and $92.4 million, respectively, at March 31, 2013. We believe that our credit risk is mitigated by our use of multiple counterparties, all of which have a median credit rating of A3 or better, and by our use of cross-collateralization agreements.

Other

Our exposure to non-current investments, defined as foreclosed real estate and invested assets which are delinquent as to interest and/or principal payments, totaled $62.8 million and $63.3 million on a fair value basis at March 31, 2013 and December 31, 2012, 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 the Employee Retirement Income Security Act. We made no voluntary contribution to our U.S. qualified defined benefit plan during the first quarter of 2013, but we expect to make contributions of approximately $50.0 million during the remainder of 2013. 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 made required contributions of £0.6 million during the first quarter of 2013, and we expect to make additional required contributions of approximately £2.0 million during the remainder of 2013.

In January 2013, we purchased and retired the outstanding principal of $62.5 million on our senior secured notes issued by Tailwind Holdings, resulting in a before-tax gain of $4.0 million.

In July 2012, our board of directors authorized the repurchase of up to $750.0 million of Unum Group's common stock. The July 2012 share repurchase program has an expiration date of January 2014, and the dollar value of shares remaining under the repurchase program was $454.9 million at March 31, 2013. During the first quarter of 2013, we repurchased 3.7 million shares at a cost of $95.1 million, including commissions.

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 $652 million and $805 million at March 31, 2013 and December 31, 2012, respectively. The March 31, 2013 balance, of which $181 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 2.5 years, and various money-market funds.  No significant restrictions exist on our ability to use or access these funds. 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.

Consolidated Cash Flows

Operating Cash Flows

Net cash provided by operating activities was $265.1 million for the first quarter of 2013, compared to $329.3 million in the same period of 2012. 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 and growth of existing business, renewal price increases, and persistency. Investment income growth is dependent on the growth in the underlying assets supporting our insurance reserves and capital and on the earned yield. The

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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 provided by investing activities was $184.1 million for the first quarter of 2013, compared to net cash used by investing activities of $181.8 million in the same period of 2012.

Proceeds from sales of available-for-sale securities increased in the first quarter of 2013 compared to the same period in 2012 due to the sale of certain securities that no longer met our investment objectives. Proceeds from maturities of available-for-sale securities were lower in the first quarter of 2013 compared to the same period in 2012 primarily due to a decrease in proceeds from bond calls and scheduled maturities, partially offset by an increase in prepayments on mortgage-backed securities. 

Proceeds from sales and maturities of other investments were higher in the first quarter of 2013 compared to the same period in 2012 primarily due to an increase in distributions received from our private equity partnerships, partially offset by a decrease in proceeds received from derivatives used in our cash flow hedging programs.  

Purchases of available-for-sale securities were lower in the first quarter of 2013 compared to the same period in 2012. As previously noted, funds available for reinvestment decreased during the first quarter of 2013 due to the overall decrease in proceeds from fixed maturity securities disposals. Additionally, there were fewer available fixed maturity securities in which to invest that currently meet our investment objectives.

Purchases of other investments decreased in the first quarter of 2013 compared to the same period in 2012 due primarily to a decrease in funding of tax credit partnerships, partially offset by an increase in funding of mortgage loans.

Net sales of short-term investments increased in the first quarter of 2013 compared to the same period in 2012 due to a significant amount of collateral returned to our counterparties associated with our securities lending program.

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 $424.5 million in the first quarter of 2013, compared to $161.6 million in the same period of 2012.

The balance outstanding under our securities lending program decreased by $219.5 million in the first quarter of 2013 and increased by $59.9 million in the first quarter of 2012.

During the first quarter of 2013, we purchased and retired the outstanding principal of $62.5 million on our floating rate, senior secured non-recourse notes issued by Tailwind Holdings for $56.2 million. During the first quarter of 2012, Tailwind Holdings made principal payments of $2.5 million on these notes.

During each of the first quarters of 2013 and 2012, Northwind Holdings made principal payments of $15.0 million on its floating rate, senior secured non-recourse notes.

During the first quarter of 2013 and 2012, we repurchased 3.7 million and 7.5 million shares of Unum Group's common stock at costs of $95.1 million and $175.2 million, respectively. Approximately $3.9 million of the amount repurchased during 2012 was settled in January 2013.

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.

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

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

The ability of Unum Group and certain of its intermediate holding company subsidiaries to continue to receive dividends from their insurance subsidiaries generally depends on the level of earnings of those insurance subsidiaries and additional factors such as RBC ratios and Financial Services Authority (FSA) capital adequacy requirements, funding growth objectives at an affiliate level, and maintaining appropriate capital adequacy ratios to support desired ratings. Insurance regulatory restrictions do not limit the amount of dividends available for distribution from non-insurance subsidiaries except where the non-insurance subsidiaries are held directly or indirectly by an insurance subsidiary and only indirectly by Unum Group. We intend to retain a level of capital in our traditional U.S. insurance subsidiaries such that we maintain a weighted average RBC level above capital adequacy requirements. Effective April 1, 2013, the United Kingdom government abolished the FSA. Capital adequacy requirements and minimum solvency margins for companies domiciled in the United Kingdom will be governed by the Prudential Regulation Authority (PRA). We do not anticipate that requirements under the PRA will differ materially from those under the FSA and expect Unum Limited to operate above PRA capital adequacy requirements and minimum solvency margins.

Debt

At March 31, 2013, we had short-term debt of $236.3 million, consisting entirely of securities lending agreements, and long-term debt of $2,673.9 million, consisting primarily of senior secured notes and junior subordinated debt securities.

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

See "Debt" in Part II, Item 7 of our annual report on Form 10-K for the year ended December 31, 2012 for further discussion.

Commitments

At March 31, 2013, we had legally binding unfunded commitments of $75.7 million and $3.7 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 $153.0 million to fund certain investments in private placement fixed maturity securities, $107.8 million to fund certain private equity partnerships, and $48.2 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, 2012. During the first three months of 2013, 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.

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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 $236.3 million of securities lending agreements outstanding which were collateralized by cash at March 31, 2013 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 three months of 2013 was $168.0 million, and the maximum amount outstanding at any month end was $236.3 million. In addition, at March 31, 2013, we had $6.5 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 three months of 2013 was $6.0 million, and the maximum amount outstanding at any month end was $6.5 million.

We had no repurchase agreements outstanding at March 31, 2013, nor did we utilize any repurchase agreements during the first quarter of 2013. 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.

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

	AM Best	Fitch	Moody's	S&P
Issuer Credit Ratings	bbb (Good)	BBB (Good)	Baa2 (Adequate)	BBB (Adequate)
Financial Strength Ratings
Provident Life and Accident	A (Excellent)	A (Strong)	A2 (Good)	A (Strong)
Provident Life and Casualty	A (Excellent)	A (Strong)	Not Rated	Not Rated
Unum Life of America	A (Excellent)	A (Strong)	A2 (Good)	A (Strong)
First Unum Life	A (Excellent)	A (Strong)	A2 (Good)	A (Strong)
Colonial Life & Accident	A (Excellent)	A (Strong)	A2 (Good)	A (Strong)
Paul Revere Life	A (Excellent)	A (Strong)	A2 (Good)	A (Strong)
Paul Revere Variable	B++ (Good)	A (Strong)	A2 (Good)	Not Rated
Unum Limited	Not Rated	Not Rated	Not Rated	A- (Strong)

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

On January 30, 2013, AM Best affirmed its A rating of Unum Group's primary domestic insurance subsidiaries and affirmed the bbb issuer credit rating for Unum Group. AM Best's outlook for all ratings is "stable." On February 11, 2013, Fitch affirmed its A rating of Unum Group's domestic insurance subsidiaries and affirmed the senior debt rating of Unum Group at BBB. Fitch's rating outlook for all ratings is "stable."

There have been no other changes in any of the rating agencies' outlook statements or ratings during 2013 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, 2012 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, 2012. During the first three months of 2013, 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, 2013.

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, 2013 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 10 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, 2012.

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 2013:

	(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, 2013	—	$	—	—	$	549,950,403
February 1 - February 28, 2013	1,737,007	24.13		1,737,007	508,039,916
March 1 - March 31, 2013	2,008,959	26.43		2,008,959	454,944,154
Total	3,745,966			3,745,966

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

(2) In July 2012, our board of directors authorized the repurchase of up to $750.0 million of Unum Group's common stock through January 2014.

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ITEM 6. EXHIBITS

Index to Exhibits

Exhibit 10.1 Form of Restricted Stock Unit Agreement with Employee for awards under the Unum Group Stock Incentive Plan of 2012.

Exhibit 10.2 Form of Cash-Settled Restricted Stock Unit Agreement with Employee for awards under the Unum Group Stock Incentive Plan of 2012.

Exhibit 10.3 Form of Nonqualified Stock Option Agreement for awards under the Unum Group Stock Incentive Plan of 2012.

Exhibit 10.4 Form of Performance Share Unit Agreement with Employee for awards under the Unum Group Stock Incentive Plan of 2012.

Exhibit 15 Letter re: Unaudited Interim Financial Information.

Exhibit 31.1 Certification of Chief Executive Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.

Exhibit 31.2 Certification of Chief Financial Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.

Exhibit 32.1 Certification of Chief Executive Officer pursuant to 18 U.S.C. Section 1350 as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.

Exhibit 32.2 Certification of Chief Financial Officer pursuant to 18 U.S.C. Section 1350 as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.

Exhibit 101 The following financial statements from Unum Group's Quarterly Report on Form 10-Q for the quarter ended March 31, 2013, filed on May 2, 2013, 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, 2013	By:	/s/ Thomas R. Watjen
		Thomas R. Watjen
		President and Chief Executive Officer
Date: May 2, 2013	By:	/s/ Richard P. McKenney
		Richard P. McKenney
		Executive Vice President and Chief Financial Officer

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EX-10.1

EXHIBIT 10.1

RESTRICTED STOCK UNIT AGREEMENT WITH EMPLOYEE

(Unum Group Stock Incentive Plan of 2012)

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

W I T N E S S E T H

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

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

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

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

Vesting Dates (Anniversaries of Grant Date)	Percentage of Total Grant Vesting
First Anniversary	33%
Second Anniversary	33%
Third Anniversary	34%

(c)Termination of Employment.

(i)Upon the Employee's Termination of Employment for any reason (other than due to the Employee's death, Disability, Retirement or Termination of Employment by the Company as a result of job elimination or requalification) during the Restriction Period, all Restricted Stock Units still subject to restriction shall be forfeited.

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

(iii)Upon the Employee's Termination of Employment during the Restriction Period by the Company as a result of job elimination or requalification, the Employee shall vest in a number of Restricted Stock Units subject to each tranche that has not vested as of the date of the Termination of Employment equal to the product of (x) the number of Restricted Stock Units subject to such tranche that has not vested as of the date of the Termination of Employment and (y) a fraction, the numerator of which is the number of full and partial months that have lapsed from the Grant Date until the date of the Termination of Employment and the denominator of which is the total number of months in the Restriction Period applicable to such tranche.

(iv)For purposes of this Agreement, “Retirement” shall mean the Employee's Termination of Employment after the attainment of age 65 or the attainment of age 55 and at least 15 years of continuous service, in each case, only if such Termination of Employment is approved as a “Retirement” by (1) the Committee in the case of an Employee who is subject to Section 16 of the Exchange Act or a “covered employee” within the meaning of Section 162(m) of the Code, or (2) the Chief Executive Officer or Senior Vice President, Human Resources, in the case of all other individuals.

(v)For purposes of this Agreement, employment with the Company shall include employment with the Company's Affiliates and successors. Nothing in this Agreement or the Plan shall confer upon the Employee any right to continue in the employ of the Company or any of its Affiliates or interfere in any way with the right of the Company or any such Affiliates to terminate the Employee's employment at any time.

2. Settlement of Units.

Subject to Section 8 (pertaining to the withholding of taxes), as soon as practicable after the date on which the Restriction Period expires, and in no event later than 30 days after such date, the Company shall deliver to the Employee or his or her personal representative, in book-position or certificate form, one Share that does not bear any restrictive legend making reference to this Agreement for each Share subject to the Restricted Stock Unit. Notwithstanding the foregoing, the Company shall be entitled to hold the Shares issuable upon settlement of Restricted Stock Units that have vested until the Company shall have received from the Employee a duly executed Form W-9 or W-8, as applicable.

3. Nontransferability of the Restricted Stock Units.

During the Restriction Period and until such time as the Restricted Stock Units are ultimately settled as provided in Section 2 above, the Restricted Stock Units and Shares covered by the Restricted Stock Units shall not be transferable by the Employee by means of sale, assignment, exchange, encumbrance, pledge, hedge or otherwise. Any purported or attempted transfer of such Restricted Stock Units or Shares shall be null and void.

4. Rights as a Stockholder.

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

5. Adjustment; Change in Control.

In the event of certain transactions during the Restriction Period, the Restricted Stock Units shall be subject to adjustment as provided in Section 3(d) of the Plan or any applicable successor provision under the Plan. Notwithstanding anything in Section 1 to the contrary: (a) upon the occurrence of a Change in Control, unless a Replacement Award is granted in respect of the Restricted Stock Units (in which case this clause (a) shall not apply), the restrictions applicable to the Restricted Stock Units shall lapse and such Restricted Stock Units shall become free of all restrictions and fully vested as of such Change in Control and shall be settled as soon as practicable following the date of such Change in Control (but not later than 30 days thereafter); and (b) if a Replacement Award is granted in respect of the Restricted Stock Units in connection with such Change in Control, upon a Termination of Employment of the Employee occurring upon or during the two years immediately following the date of such Change in Control by reason of death, Disability or Retirement, by the Company without Cause, or by the Employee for Good Reason, the restrictions applicable to such Replacement Award, to the extent not vested as of such Termination of Employment, shall lapse, and such Replacement Award shall become free of all restrictions and fully vested and shall be settled as soon as practicable following the date of Termination of Employment (but not later than 30 days thereafter); provided, however, that any Restricted Stock Units that constitute “nonqualified deferred compensation” as defined under Section 409A of the Code shall, to the extent necessary to avoid the imposition of penalty taxes under Section 409A of the Code, not be so settled unless the Change in Control constitutes a “change in control event” within the meaning of Section 409A of the Code (it being understood that nothing in this Section 5 shall preclude the Company from settling upon a Change in Control any Restricted Stock Units that are not replaced by a Replacement Award, to the extent effectuated in accordance with Treasury Reg. § 1.409A-3(j)(ix)).

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

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

7. Other Restrictions.

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

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

8. Taxes and Withholding.

No later than the date as of which an amount first becomes includible in the gross income of the Employee for federal, state, local or foreign income, employment or other tax purposes with respect to any Restricted Stock Units, the Employee shall pay to the Company, or make arrangements satisfactory to the Company regarding the payment of, all federal, state, local and foreign taxes that are required by applicable laws and regulations to be withheld with respect to such amount. The obligations of the Company under this Agreement shall be conditioned on compliance by the Employee with this Section 8, and the Company shall, to the extent permitted by law, have the right to deduct any such taxes from any payment otherwise due to the Employee, including deducting such amount from the delivery of shares upon settlement of the Restricted Stock Units that gives rise to the withholding requirement.

9. Notices.

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

If to the Employee:

At the most recent address

on file at the Company

If to the Company:

Unum Group

1 Fountain Square

Chattanooga, Tennessee 37402

Attention: Executive Compensation, Human Resources

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

10. Effect of Agreement.

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

11. Laws Applicable to Construction; Consent to Jurisdiction.

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

12. Severability.

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

13. Conflicts and Interpretation.

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

14. Amendment.

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

15. Section 409A.

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

16. Headings.

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

17. Counterparts.

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

18. Waiver and Release.

In consideration for the granting of the Restricted Stock Units, the Employee hereby waives any and all claims whether known or unknown that the Employee may have against the Company and its Subsidiaries and Affiliates and their respective directors, officers, shareholders, agents or employees arising out of, in connection with or related to the Employee's employment, except for (1) claims under this Agreement, (2) claims that arise after the date hereof and obligations that by their terms are to be performed after the date hereof, (3) claims for compensation or benefits under any compensation or benefit plan or arrangement of the Company and its Subsidiaries and Affiliates, (4) claims for indemnification respecting acts or omissions in connection with the Employee's service as a director, officer or employee of the Company or any of its Subsidiaries and Affiliates, (5) claims for insurance coverage under directors' and officers' liability insurance policies maintained by the Company or any of its Subsidiaries or Affiliates, or (6) any right the Employee may have to obtain contribution in the event of the entry of judgment against the Company as a result of any act or failure to act for which both the Employee and the Company or any of its Subsidiaries or Affiliates are jointly responsible. The Employee waives any and all rights under the laws of any state (expressly including but not limited to Section 1542 of the California Civil Code), which is substantially similar in wording or effect as follows:

A general release does not extend to claims which the creditor does not know or suspect to exist in his favor at the time of executing the Release, which if known by him must have materially affected his settlement with the debtor.

This waiver specifically includes all claims under the Age Discrimination in Employment Act of 1967, as amended. The Employee acknowledges that the Employee (a) has been advised to consult an attorney in connection with entering into this Agreement; (b) has 21 days to consider this waiver and release; and (c) may revoke this waiver and release within seven days of execution upon written notice to Legal Counsel, Employment and Labor, Law Department, Unum Group, 1 Fountain Square, Chattanooga, Tennessee 37402. The waiver and release will not become enforceable until the expiration of the seven-day period. If the waiver and release is revoked during such seven-day period, the grant shall be void and of no further effect.

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

Date:	[Acceptance Date]	EMPLOYEE: [Participant Name]
		[Participant Signature]
		UNUM GROUP
		By:
			[Authorized Signature]
			[Name]
			[Title]

EX-10.2

EXHIBIT 10.2

CASH SETTLED RESTRICTED STOCK UNIT AGREEMENT WITH EMPLOYEE

(Unum Group Stock Incentive Plan of 2012)

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

W I T N E S S E T H

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

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

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

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

Vesting Dates (Anniversaries of Grant Date)	Percentage of Total Grant Vesting
First Anniversary	33%
Second Anniversary	33%
Third Anniversary	34%

(c)Termination of Employment.

(i)Upon the Employee's Termination of Employment for any reason (other than due to the Employee's death, Disability, Retirement or Termination of Employment by the Company without Cause) during the Restriction Period, all Restricted Stock Units still subject to restriction shall be forfeited.

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

(iii)Upon the Employee's Termination of Employment during the Restriction Period by the Company without Cause, including as a result of job elimination or requalification, the Employee shall vest in a number of Restricted Stock Units subject to each tranche that has not vested as of the date of the Termination of Employment equal to the product of (x) the number of Restricted Stock Units subject to such tranche that has not vested as of the date of the Termination of Employment and (y) a fraction, the numerator of which is the number of full and partial months that have lapsed from the Grant Date until the date of the Termination of Employment and the denominator of which is the total number of months in such Restriction Period applicable to such tranche.

(iv)For purposes of this Agreement, “Retirement” shall mean the Employee's Termination of Employment after the attainment of age 65 or the attainment of age 55 and at least 15 years of continuous service, in each case, only if such Termination of Employment is approved as a “Retirement” by (1) the Committee in the case of an Employee who is subject to Section 16 of the Exchange Act or a “covered employee” within the meaning of Section 162(m) of the Code, or (2) the Chief Executive Officer or Senior Vice President, Human Resources, in the case of all other individuals.

(v)For purposes of this Agreement, employment with the Company shall include employment with the Company's Affiliates and successors. Nothing in this Agreement or the Plan shall confer upon the Employee any right to continue in the employ of the Company or any of its Affiliates or interfere in any way with the right of the Company or any such Affiliates to terminate the Employee's employment at any time.

2.    Settlement of Units.

Subject to Section 8 (pertaining to the withholding of taxes), as soon as practicable after the date on which the Restriction Period expires, and in no event later than 30 days after such date, the Company shall deliver to the Employee or his or her personal representative an amount of cash equal to the Fair Market Value of a Share on the date of settlement for each Share subject to the Restricted Stock Unit.

3.    Nontransferability of the Restricted Stock Units.

During the Restriction Period and until such time as the Restricted Stock Units are ultimately settled as provided in Section 2 above, the Restricted Stock Units shall not be transferable by the Employee by means of sale, assignment, exchange, encumbrance, pledge, hedge or otherwise. Any purported or attempted transfer of such Restricted Stock Units shall be null and void.

4.    Rights as a Stockholder.

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

5.    Adjustment; Change in Control.

In the event of certain transactions during the Restriction Period, the Restricted Stock Units shall be subject to adjustment as provided in Section 3(d) of the Plan or any applicable successor provision under the Plan. Notwithstanding anything in Section 1 to the contrary: (a) upon the occurrence of a Change in Control, unless a Replacement Award is granted in respect of the Restricted Stock Units (in which case this clause (a) shall not apply), the restrictions applicable to the Restricted Stock Units shall lapse and such Restricted Stock Units shall become free of all restrictions and fully vested, as of such Change in Control and shall be settled as soon as practicable following the date of such Change in Control (but not later than 30 days thereafter); and (b) if a Replacement Award is granted in respect of the Restricted Stock Units, upon a Termination of Employment of the Employee occurring upon or during the two years immediately following the date of such Change in Control by reason of death, Disability or Retirement, by the Company without Cause, or by the Employee for Good Reason, the restrictions applicable to such Replacement Award, to the extent not vested as of such Termination of Employment, shall lapse, and such Replacement Award shall become free of all restrictions and fully vested and shall be settled as soon as practicable following the date of Termination of Employment (but not later than 30 days thereafter); provided, however, that any Restricted Stock Units that constitute “nonqualified deferred compensation” as defined under Section 409A of the Code shall, to the extent necessary to avoid the imposition of penalty taxes under Section 409A of the Code, not be so settled unless the Change in Control constitutes a “change in control event” within the meaning of Section 409A of the Code (it being understood that nothing in this Section 5 shall preclude the Company from settling upon a Change in Control any Restricted Stock Units that are not replaced by a Replacement Award, to the extent effectuated in accordance with Treasury Reg. § 1.409A-3(j)(ix)).

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

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

7.    Other Restrictions.

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

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

8.    Taxes and Withholding.

No later than the date as of which an amount first becomes includible in the gross income of the Employee for federal, state, local or foreign income, employment or other tax purposes with respect to any Restricted Stock Units, the Employee shall pay to the Company, or make arrangements satisfactory to the Company regarding the payment of, all federal, state, local and foreign taxes that are required by applicable laws and regulations to be withheld with respect to such amount. The obligations of the Company under this Agreement shall be conditioned on compliance by the Employee with this Section 8, and the Company shall, to the extent permitted by law, have the right to deduct any such taxes from any payment otherwise due to the Employee, including deducting such amount from the delivery of cash upon settlement of the Restricted Stock Units that gives rise to the withholding requirement.

9.    Notices.

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

If to the Employee:

At the most recent address

on file at the Company

If to the Company:

Unum Group

1 Fountain Square

Chattanooga, Tennessee 37402

Attention: Executive Compensation, Human Resources

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

10.    Effect of Agreement.

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

11.    Laws Applicable to Construction; Consent to Jurisdiction.

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

12.    Severability.

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

13.    Conflicts and Interpretation.

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

(b)    In the event of any conflict between the terms of this Agreement and the terms of any written and effective employment agreement between the Employee and the Company (or any of its Subsidiaries or Affiliates), the terms of the employment agreement shall apply as if a part of this Agreement and shall be controlling and determinative.

14.    Amendment.

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

15.    Section 409A.

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

16.    Headings.

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

17.    Counterparts.

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

18.    Waiver and Release.

In consideration for the granting of the Restricted Stock Units, the Employee hereby waives any and all claims whether known or unknown that the Employee may have against the Company and its Subsidiaries and Affiliates and their respective directors, officers, shareholders, agents or employees arising out of, in connection with or related to the Employee's employment, except for (1) claims under this Agreement, (2) claims that arise after the date hereof and obligations that by their terms are to be performed after the date hereof, (3) claims for compensation or benefits under any compensation or benefit plan or arrangement of the Company and its Subsidiaries and Affiliates, (4) claims for indemnification respecting acts or omissions in connection with the Employee's service as a director, officer or employee of the Company or any of its Subsidiaries and Affiliates, (5) claims for insurance coverage under directors' and officers' liability insurance policies maintained by the Company or any of its Subsidiaries or Affiliates, or (6) any right the Employee may have to obtain contribution in the event of the entry of judgment against the Company as a result of any act or failure to act for which both the Employee and the Company or any of its Subsidiaries or Affiliates are jointly responsible. The Employee waives any and all rights under the laws of any state (expressly including but not limited to Section 1542 of the California Civil Code), which is substantially similar in wording or effect as follows:

A general release does not extend to claims which the creditor does not know or suspect to exist in his favor at the time of executing the Release, which if known by him must have materially affected his settlement with the debtor.

This waiver specifically includes all claims under the Age Discrimination in Employment Act of 1967, as amended. The Employee acknowledges that the Employee (a) has been advised to consult an attorney in connection with entering into this Agreement; (b) has 21 days to consider this waiver and release; and (c) may revoke this waiver and release within seven days of execution upon written notice to Legal Counsel, Employment and Labor, Law Department, Unum Group, 1 Fountain Square, Chattanooga, Tennessee 37402. The waiver and release will not become enforceable until the expiration of the seven-day period. If the waiver and release is revoked during such seven-day period, the grant shall be void and of no further effect.

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

Date:	[Acceptance Date]	EMPLOYEE: [Participant Name]
		[Participant Signature]
		UNUM GROUP
		By:
			[Authorized Signature]
			[Name]
			[Title]

EX-10.3

EXHIBIT 10.3

NONQUALIFIED STOCK OPTION AGREEMENT

under the

UNUM GROUP

STOCK INCENTIVE PLAN OF 2012

Optionee:	[Participant Name]
Number of Shares Subject to Option:	[Shares Granted]
Exercise Price per Share:	[Grant Price]
Date of Grant:	[Grant Date]

1.Grant of Option. Unum Group (the “Company”) hereby grants to the Optionee named above (the “Optionee”), under the Unum Group Stock Incentive Plan of 2012 (the “Plan”), a Nonqualified Stock Option to purchase, on the terms and conditions set forth in the Plan and in this agreement (this “Option Agreement”), the number of Shares indicated above at the exercise price per Share set forth above (the “Option”). Capitalized terms used herein and not otherwise defined shall have the meanings assigned such terms in the Plan.

2.Vesting of Option. Unless the exercisability of the Option is accelerated in accordance with the Plan or as otherwise set forth herein, the Option shall, subject to the Optionee's continued employment with the Company, become exercisable (“vest”) as follows:

Percentage of Shares	Vesting Schedule
33%	First Anniversary of Date of Grant
33%	Second Anniversary of Date of Grant
34%	Third Anniversary of Date of Grant

Notwithstanding the foregoing, the Option shall vest immediately as of (i) the Optionee's Termination of Employment by reason of the Optionee's death, (ii) the Optionee's Termination of Employment by reason of the Optionee's Disability, (iii) the Optionee's Termination of Employment by reason of a Qualified Retirement (as defined in Section 3 below), (iv) the Optionee's Termination of Employment pursuant to which the Committee elects (pursuant to Section 3 below) to extend the period of exercise, or (v) a Change in Control; provided that if a Replacement Award is granted in respect of the Option in connection with such Change in Control, (A) the Option shall not vest as of such Change in Control and shall instead vest immediately upon a Termination of Employment of the Optionee occurring upon or during the two years immediately following the date of such Change in Control by reason of death, Disability or Qualified Retirement, by the Company without Cause, or by the Optionee for Good Reason, and (B) notwithstanding any provision of Section 3 below to the contrary, upon a Termination of Employment of the Optionee described in clause (A), the Option may be exercised after such Termination of Employment until the later of (1) the last date on which such Option would be forfeited in connection with the applicable Termination of Employment pursuant to the terms and conditions of Section 3 below (it being understood that in no event shall the period during which the Option may be exercised be extended beyond the Expiration Date (as defined below)) and (2) the earlier of (x) the third anniversary of such Change in Control and (y) the Expiration Date.

3.Period of Option and Limitations on Right to Exercise. The Option, to the extent not previously exercised, and whether vested or unvested, will lapse and be forfeited upon the earliest to occur of the following:

(a)As of 4:00 p.m., Eastern Time, on the eighth anniversary of the Date of Grant (the “Expiration Date”);

(b)Except as specifically provided otherwise in this Section 3, if (i) the Optionee's employment is voluntarily terminated by the Optionee or is involuntarily terminated by the Company without Cause and (ii) the Option was exercisable immediately before the date of such Termination of Employment, 90 days after the effective date of such Termination of Employment;

(c)Except as specifically provided otherwise in this Section 3, if the Optionee's employment is voluntarily terminated by the Optionee and the Option was not exercisable immediately before the date of such voluntary Termination of Employment, on the effective date of such voluntary Termination of Employment;

(d)Except as specifically provided otherwise in this Section 3, if the Optionee's employment is involuntarily terminated by the Company for Cause, on the effective date of such involuntary Termination of Employment;

(e)Except as specifically provided otherwise in this Section 3, if the Optionee's employment is involuntarily terminated by the Company and the Option was not exercisable immediately before the date of such involuntary Termination of Employment, on the effective date of such involuntary Termination of Employment; provided that the Committee may extend the period for exercise of the Option for a period of 60 days if the following conditions are met: (i) there are no performance issues, (ii) the termination was not for Cause or Willful Misconduct (as defined below), and (iii) the Chair of the Committee, after consultation with management, finds that the circumstances of the Termination of Employment would constitute a hardship if there were no extension and recommends such extension, except that if the Optionee is an executive officer for purposes of Section 16 of the Securities Exchange Act of 1934, no recommendation shall be required and the decision to extend or not to extend the exercise period for such executive officer shall be made directly by the Committee. If the Optionee is not an executive officer, then prior to such Termination of Employment, the Chair shall review the Termination of Employment for hardship. If the Optionee is an executive officer or if the Optionee is not an executive officer and prior to such Termination of Employment the Chair finds hardship and makes the recommendation to extend, the Committee shall take action as to whether to extend the period for exercise of the Option. The Option shall not become vested during the period between such Termination of Employment and any action taken by the Committee solely as the result of the tolling of any lapse or forfeiture provisions that would otherwise have been applicable, but it may vest if the vesting date or other circumstance accelerating vesting occurs subsequent to such Termination of Employment but prior to the action by the Committee. If the Committee approves the extension, the Optionee shall have 60 days after the date of such approval to exercise the Option. If the Committee does not approve the extension, the Option lapses and is forfeited at 4:00 p.m., Eastern Time, on the fifth business day after the Committee's non-approval. If the Chair, after consultation with management, determines not to make a positive recommendation prior to the date of the Termination of Employment, the Option lapses and is forfeited on such date;

(f)If the Optionee's employment is involuntarily terminated by the Company for Willful Misconduct or if the Company determines subsequent to the Optionee's Termination of Employment for any reason that the Optionee engaged in Willful Misconduct during the Examination Period (as defined below), as of the date of discovery of the Willful Misconduct unless the Committee determines otherwise. If any portion of the Option has been exercised after the time such Willful Misconduct first occurred, as determined by the Company in its sole and absolute discretion (which time shall not be earlier than the beginning of the Examination Period), the Optionee shall immediately return to the Company an amount equal to the difference between the exercise price and the Fair Market Value (at the time of exercise of the portion of the Option) of Shares received in respect of such exercised portion of the Option;

(g)If the Optionee's employment terminates by reason of death or Disability, three years after the date of death or Termination of Employment due to Disability, as applicable; and

(h)If the Optionee's employment terminates by reason of a Qualified Retirement, five years after the effective date of the Qualified Retirement. For purposes of this Agreement, “Qualified Retirement” shall mean (i) retirement at age 65 or older without regard to years of service, (ii) early retirement at ages from 55 to and including 64 for persons having at least 15 years of continuous service with the Company, or (iii) with the approval of the Committee, early retirement at ages from 55 to and including 64 for a person having fewer than 15 years of continuous service with the Company.

Subject to such requirements as may exist in this Section 3, the Committee may provide in writing that the period during which the Option must be exercised will be extended; provided, however, that in no event shall the period during which the Option must be exercised be extended beyond the Expiration Date.

For purposes of this Agreement, “Willful Misconduct” shall include without limitation (i) cause for which termination is required or permitted under Company policies or applicable law, (ii) violation of the terms and conditions of any noncompetition, employment, non-solicitation, confidentiality or similar and related agreements entered into by the Optionee with the Company, (iii) engaging purposefully, knowingly or recklessly in misconduct that is injurious to the Company, monetarily or otherwise, (iv) unauthorized disclosure of any confidential, proprietary or trade secret information or materials of the Company, or (v) the material violation of any Company policy or policies. The Company may examine the Optionee's conduct in the one-year period prior to the Optionee's Termination of Employment and in the two-year period after such Termination of Employment to determine whether there has been Willful Misconduct (the “Examination Period”). Discovery of such Willful Misconduct is permitted for three years after Termination of Employment.

4.Exercise of Option. The Option shall be exercised in accordance with directions to be provided by the Human Resources Department at the principal executive offices of the Company. Unless the exercise is a broker-assisted “cashless exercise” or a “net exercise” as described below, full payment in cash, Shares previously acquired by the Optionee, or any combination thereof, for the number of Shares being purchased, must be forwarded as directed; provided, however, that if Shares are used to pay the exercise price, such Shares must have been held by the Optionee for at least six months. The Fair Market Value of the surrendered Shares as of the 4:00 p.m. closing price on the New York Stock Exchange last trading day immediately prior to the exercise date shall be used in valuing Shares used in payment of the exercise price. When Shares are delivered, such delivery may be by attestation of ownership or actual delivery of one or more certificates. If delivery is made by attestation of ownership, Shares attested to must be immediately and freely tradable. To the extent permitted under Regulation T of the Federal Reserve Board, and subject to applicable securities laws, the Option may be exercised through a broker in a so-called “cashless exercise” whereby the broker sells Shares subject to the Option and delivers cash sales proceeds to the Company in payment of the exercise price and applicable tax withholding. In such case, the date of exercise shall be deemed to be the transaction date and the exercise price and applicable tax withholding shall be delivered in accordance with the Company's directions on the settlement date. Payment of the Option's exercise price may, to the extent permitted by the directions to be provided by the Human Resources Department at the principal executive offices of the Company, also be made through a “net exercise” pursuant to which the Company withholds a number of Shares having a Fair Market Value (based on the Fair Market Value of Shares on the date the Option is exercised) equal to the product of (A) the exercise price multiplied by (B) the number of Shares in respect of which the Option shall been exercised.

Subject to the terms of this Option Agreement, the Option may be exercised at any time and without regard to any other option held by the Optionee to purchase Shares.

5.Limitation of Rights. The Option does not confer to the Optionee or the Optionee's personal representative any rights of a shareholder of the Company unless and until Shares are in fact issued to such person in connection with the exercise of the Option. Nothing in this Option Agreement shall interfere with or limit in any way the right of the Company or any Subsidiary to terminate the Optionee's employment at any time, nor confer upon the Optionee any right to continue in the employ of the Company or any Subsidiary.

6.Payment of Taxes and Withholding. No later than the date as of which an amount first becomes includible in the gross income of the Optionee for federal, state, local or foreign income, employment or other tax purposes with respect to any portion of the Option, the Optionee shall pay to the Company, or make arrangements satisfactory to the Company (including, if applicable, pursuant to Section 4 above) regarding the payment of, all federal, state, local and foreign taxes that are required by applicable laws and regulations to be withheld with respect to such portion of the Option. The obligations of the Company under this Option Agreement shall be conditioned on compliance by the Optionee with this Section 6, and the Company shall, to the extent permitted by law, have the right to deduct any such taxes from any payment otherwise due to the Optionee, including deducting such amount from the delivery of Shares upon exercise of the Option that gives rise to the withholding requirement.

7.Share Reserve. The Company shall at all times during the term of this Option Agreement reserve and keep available such number of Shares as will be sufficient to satisfy the requirements of this Option Agreement.

8.Optionee's Covenant. The Optionee hereby agrees to use his best efforts to provide services to the Company in a workmanlike manner and to promote the Company's interests.

9.Restrictions on Transfer and Pledge. The Option may not be pledged, encumbered or hypothecated to or in favor of any party other than the Company or an Affiliate or Subsidiary, or be subject to any lien, obligation or liability of the Optionee to any other party other than the Company or an Affiliate or Subsidiary. The Option is not assignable or transferable by the Optionee other than by will or the laws of descent and distribution or pursuant to a domestic relations order that would satisfy Section 414(p)(1)(A) of the Code; provided, however, that the Committee may (but need not) permit other transfers where the Committee concludes that such transfers (i) do not result in accelerated taxation and (ii) are otherwise appropriate and desirable, taking into account any factors deemed relevant, including without limitation, state or federal tax or securities laws applicable to transferable options. The Option may be exercised during the lifetime of the Optionee only by the Optionee or any permitted transferee.

10.Restrictions on Issuance of Shares; Other Restrictions. If at any time the Committee shall determine in its discretion, that listing, registration or qualification of Shares covered by the Option upon any securities exchange or under any state or federal law, or the consent or approval of any governmental or regulatory body, is necessary or desirable as a condition to the exercise of the Option, the Option may not be exercised in whole or in part unless and until such listing, registration, qualification, consent or approval shall have been effected or obtained free of any conditions not acceptable to the Committee. If the Optionee is an insider as described under the Company's Insider Trading Policy (as in effect from time to time and any successor policies), the Optionee shall be required to obtain preclearance from the General Counsel or Securities Counsel of the Company

prior to purchasing or selling any of the Company's securities, including any Shares issued upon exercise of the Option, and may be prohibited from selling such securities other than during an open trading window. The Optionee further acknowledges that the Company may, in its discretion, prohibit the Optionee from selling such securities even during an open trading window if the Company has concerns over the potential for insider trading.

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

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

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

14.Successors. This Option Agreement shall be binding upon any successor of the Company, in accordance with the terms of this Option Agreement and the Plan.

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

16.Notice. Notices and communications under this Option Agreement must be in writing and either personally delivered or sent by registered or certified United States mail, return receipt requested, postage prepaid. Notices to the Company must be addressed to:

Unum Group

1 Fountain Square

Chattanooga, Tennessee 37402

Attn: Executive Compensation, Human Resources

or any other address designated by the Company in a written notice to the Optionee. Notices to the Optionee will be directed to the address of the Optionee then currently on file with the Company, or at any other address given by the Optionee in a written notice to the Company.

17.Section 409A. It is the intention that the Option does not constitute “deferred compensation” within the meaning of Section 409A of the Code. If the Company determines after the Date of Grant that an amendment to this Agreement is necessary to ensure the foregoing, it may make such amendment, notwithstanding any other provision of this Agreement or the Plan to the contrary, effective as of the Date of Grant or any later date, without the consent of the Optionee.

18.Headings; Counterparts. The headings of Sections herein are included solely for convenience of reference and shall not affect the meaning or interpretation of any of the provisions of this Option Agreement. This Agreement may be executed in counterparts, which together shall constitute one and the same original.

19.Waiver and Release. In consideration for the Option, the Optionee hereby waives any and all claims whether known or unknown that the Optionee may have against the Company and its Subsidiaries and Affiliates and their respective directors, officers, shareholders, agents or employees arising out of, in connection with or related to the Optionee's employment, except for (1) claims under this Agreement, (2) claims that arise after the date hereof and obligations that by their terms are to be performed after the date hereof, (3) claims for compensation or benefits under any compensation or benefit plan or arrangement of the Company and its Subsidiaries and Affiliates, (4) claims for indemnification respecting acts or omissions in connection with the Optionee's service as a director, officer or employee of the Company or any of its Subsidiaries and Affiliates, (5) claims for

insurance coverage under directors' and officers' liability insurance policies maintained by the Company or any of its Subsidiaries or Affiliates, or (6) any right the Optionee may have to obtain contribution in the event of the entry of judgment against the Company as a result of any act or failure to act for which both the Optionee and the Company or any of its Subsidiaries or Affiliates are jointly responsible. The Optionee waives any and all rights under the laws of any state (expressly including but not limited to Section 1542 of the California Civil Code), which is substantially similar in wording or effect as follows:

A general release does not extend to claims which the creditor does not know or suspect to exist in his favor at the time of executing the Release, which if known by him must have materially affected his settlement with the debtor.

This waiver specifically includes all claims under the Age Discrimination in Employment Act of 1967, as amended. The Optionee acknowledges that the Optionee (a) has been advised to consult an attorney in connection with entering into this Option Agreement; (b) has 21 days to consider this waiver and release; and (c) may revoke this waiver and release within seven-days of execution upon written notice to Attn: Corporate Secretary, Law Department, Unum Group, 1 Fountain Square, Chattanooga, Tennessee 37402. The waiver and release will not become enforceable until the expiration of the seven-day period. If the waiver and release is revoked during such seven-day period, the grant shall be void and of no further effect.

IN WITNESS WHEREOF, the Company, acting by and through its duly authorized officers, has caused this Option Agreement to be executed, and the Optionee has executed this Option Agreement, all as of the day and year written below.

Date:	[Acceptance Date]	OPTIONEE: [Optionee Name]
		[Optionee Signature]
		UNUM GROUP
		By:
			[Authorized Signature]
			[Name]
			[Title]

EX-10.4

EXHIBIT 10.4

PERFORMANCE SHARE UNIT AGREEMENT WITH EMPLOYEE

(Unum Group Stock Incentive Plan of 2012)

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

W I T N E S S E T H

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

1. Grant, Vesting and Forfeiture of Performance Share Units.

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

(b)Earning Performance Share Units/Performance Period.

(i)Earning Performance Share Units. Subject to Section 1(b)(ii) and 1(c) below, the Employee shall earn a percentage of Performance Share Units in accordance with Schedule A on the date that the Committee certifies that the Company has achieved the performance goals set forth on Schedule A, which date shall be no later than two and a half months after the end of the performance period extending from January 1, 2013 to December 31, 2015, inclusive (the “Performance Period”).

(ii)Performance Period. Subject to the terms and conditions of this Agreement, the Performance Share Units earned pursuant to Section 1(b)(i) shall vest and no longer be subject to any restriction upon the expiration of the Performance Period.

(c)    Termination of Employment.

(i)General. Upon the Employee's Termination of Employment for any reason (other than as specified in Section 1(c)(ii) below) during the Performance Period, all Performance Share Units still subject to restriction shall be forfeited.

(ii)Death/Disability/Retirement/Without Cause. In the event of the Employee's Termination of Employment during the Performance Period (A) due to the Employee's death, Disability or Retirement, or by the Company as a result of job elimination or requalification, or (B) by the Company without Cause or by the Employee for Good Reason (provided that this clause (B) shall be effective only if the Employee's Employment Agreement, if any, provides for such Termination of Employment, in which case, “Good Reason” shall have the meaning ascribed to it in the Employee's Employment Agreement), the Employee shall earn a number of Performance Share Units equal to the product of (x) the number of Performance Share Units determined in accordance with Section 1(b)(i) and (y) a fraction, the numerator of which is the number of full and partial months that have lapsed from the first day of the Performance Period until the date of the Termination of Employment and the denominator of which is the total number of months in the Performance Period. Such Performance Share Units shall be settled at such time as Performance Share Units would be settled in accordance with Section 2.

(iii)Retirement Definition. For purposes of this Agreement, “Retirement” shall mean the Employee's Termination of Employment after the attainment of age 65 or the attainment of age 55 and at least 15 years of continuous service, in each case, only if such Termination of Employment is approved as a “Retirement” by (1) the Committee in the case of an Employee who is subject to Section 16 of the Exchange Act or a “covered employee” within the meaning of Section 162(m) of the Code, or (2) the Chief Executive Officer or Senior Vice President, Human Resources, in the case of all other individuals.

(iv)Employment. For purposes of this Agreement, employment with the Company shall include employment with the Company's Affiliates and successors. Nothing in this Agreement or the Plan shall confer upon the

Employee any right to continue in the employ of the Company or any of its Affiliates or interfere in any way with the right of the Company or any such Affiliates to terminate the Employee's employment at any time.

2. Settlement of Units.

Subject to Section 8 (pertaining to the withholding of taxes), and except as otherwise provided in Section 5, as soon as practicable after the date on which the Performance Period expires, and in no event later than two and a half months after the end of the Performance Period, the Company shall deliver to the Employee or his or her personal representative, in book-position or certificate form, one Share that does not bear any restrictive legend making reference to this Agreement for each Performance Share Unit earned pursuant to this Agreement.

3. Nontransferability of the Performance Share Units.

During the Performance Period and until such time as the Performance Share Units are ultimately settled as provided in Section 2 above, the Performance Share Units and Shares covered by the Performance Share Units shall not be transferable by the Employee by means of sale, assignment, exchange, encumbrance, pledge, hedge or otherwise. Any purported or attempted transfer of such Performance Share Units or Shares shall be null and void.

4. Rights as a Stockholder.

During the Performance Period and until such time as the Performance Share Units are ultimately settled as provided in Section 2 above, the Employee shall not be entitled to any rights of a stockholder with respect to the Performance Share Units (including, without limitation, any voting rights); provided that with respect to any dividends paid on Shares underlying the Performance Share Units, such dividends will be reinvested into additional Performance Share Units, which, as applicable, shall vest and be settled at such time as, and in the same ratio and only to the extent that the underlying Performance Share Units vest and are settled.

5. Adjustment; Change in Control.

In the event of certain transactions during the Performance Period, the Performance Share Units shall be subject to adjustment as provided in Section 3(d) of the Plan or any applicable successor provision under the Plan.

Notwithstanding anything in Section 1 to the contrary, subject to Section 3(d) of the Plan or any applicable successor provision under the Plan, upon the occurrence of a Change in Control the Performance Share Units shall (i) be deemed earned in the number of Performance Share Units originally granted as provided in Section 1(a), without regard to performance, (ii) shall remain outstanding and shall vest and be subject to restriction until the end of the Performance Period in accordance with Section 1(b)(ii), and (iii) subject to this Section 5, shall be settled by the Company as provided in Section 2. For purposes of this Agreement, Performance Share Units that are deemed earned upon, and remain outstanding following a Change in Control pursuant to this Section 5, shall be referred to as “Assumed PSUs”.

Notwithstanding anything in Section 1 to the contrary, (A) upon a Termination of Employment of the Employee occurring upon or during the two years immediately following the date of a Change in Control (but prior to the settlement of the Employee's Assumed PSUs) by reason of death, Disability or Retirement, by the Company without Cause, or by the Employee for Good Reason, then such Assumed PSUs shall become free of all restrictions and fully vested and shall be settled as soon as practicable following the date of Termination of Employment (but not later than 30 days thereafter); provided, however, in each case, that that any Assumed PSUs that constitute “nonqualified deferred compensation” as defined under Section 409A of the Code shall, to the extent necessary to avoid the imposition of penalty taxes under Section 409A of the Code, not be so settled unless the Change in Control constitutes a “change in control event” within the meaning of Section 409A of the Code; (B) upon a Termination of Employment of the Employee occurring more than two years following the date of a Change in Control (but prior to the settlement of the Employee's Assumed PSUs) by reason of death, Disability or Retirement, then such Assumed PSUs shall become free of all restrictions and fully vested and shall be settled in accordance with Section 2 hereof; and (C) upon a Termination of Employment of the Employee occurring more than two years following the date of a Change in Control (but prior to the settlement of the Employee's Assumed PSUs) by the Company without Cause or by the Employee for Good Reason, then a portion of such Employee's Assumed PSUs, equal to the full value of the Assumed PSUs multiplied by a fraction, the numerator of which is the number of full and partial months that have lapsed from the first day of the Performance Period until the date of the Termination of Employment and the denominator of which is the total number of months in the Performance Period, shall become free of all restrictions and be vested and shall be settled in accordance with Section 2 hereof (for the avoidance of doubt, if an Employee who is eligible for Retirement incurs a Termination of Employment by the Company without Cause or by the Employee for Good Reason, the vesting of such Employee's Assumed PSUs shall be governed by subsection (B) hereof). Nothing in this Section 5 shall preclude the Company

from settling, upon a Change in Control, any Performance Share Units, to the extent effectuated in accordance with Treasury Reg. § 1.409A-3(j)(ix)).

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

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

7. Other Restrictions.

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

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

8. Taxes and Withholding.

No later than the date as of which an amount first becomes includible in the gross income of the Employee for federal, state, local or foreign income, employment or other tax purposes with respect to any Performance Share Units, the Employee shall pay to the Company, or make arrangements satisfactory to the Company regarding the payment of, the minimum federal, state, local and foreign taxes that are required by applicable laws and regulations to be withheld with respect to such amount. The obligations of the Company under this Agreement shall be conditioned on compliance by the Employee with this Section 8, and the Company shall, to the extent permitted by law, have the right to deduct any such taxes from any payment otherwise due to the Employee, including deducting such amount from the delivery of shares upon settlement of the Performance Share Units that gives rise to the withholding requirement.

9. Notices.

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

If to the Employee:

At the most recent address

on file at the Company

If to the Company:

Unum Group

1 Fountain Square

Chattanooga, Tennessee 37402

Attention: Executive Compensation, Human Resources

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

10. Effect of Agreement.

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

11. Laws Applicable to Construction; Consent to Jurisdiction.

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

12. Severability.

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

13. Conflicts and Interpretation.

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

14. Amendment.

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

15. Section 409A.

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

16. Headings.

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

17. Counterparts.

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

18. Waiver and Release.

In consideration for the granting of the Performance Share Units, the Employee hereby waives any and all claims whether known or unknown that the Employee may have against the Company and its Subsidiaries and Affiliates and their respective directors, officers, shareholders, agents or employees arising out of, in connection with or related to the Employee's employment, except for (1) claims under this Agreement, (2) claims that arise after the date hereof and obligations that by their terms are to be performed after the date hereof, (3) claims for compensation or benefits under any compensation or benefit plan or arrangement of the Company and its Subsidiaries and Affiliates, (4) claims for indemnification respecting acts or omissions in connection with the Employee's service as a director, officer or employee of the Company or any of its Subsidiaries and Affiliates, (5) claims for insurance coverage under directors' and officers' liability insurance policies maintained by the Company or any of its Subsidiaries or Affiliates, or (6) any right the Employee may have to obtain contribution in the event of the entry of judgment against the Company as a result of any act or failure to act for which both the Employee and the Company or any of its Subsidiaries or Affiliates are jointly responsible. The Employee waives any and all rights under the laws of any state (expressly including but not limited to Section 1542 of the California Civil Code), which is substantially similar in wording or effect as follows:

A general release does not extend to claims which the creditor does not know or suspect to exist in his favor at the time of executing the Release, which if known by him must have materially affected his settlement with the debtor.

This waiver specifically includes all claims under the Age Discrimination in Employment Act of 1967, as amended. The Employee acknowledges that the Employee (a) has been advised to consult an attorney in connection with entering into this Agreement; (b) has 21 days to consider this waiver and release; and (c) may revoke this waiver and release within seven days of execution upon written notice to Legal Counsel, Employment and Labor, Law Department, Unum Group, 1 Fountain Square, Chattanooga, Tennessee 37402. The waiver and release will not become enforceable until the expiration of the seven-day period. If the waiver and release is revoked during such seven-day period, the grant shall be void and of no further effect.

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

Date:	[Acceptance Date]	EMPLOYEE: [Participant Name]
		[Participant Signature]
		UNUM GROUP
		By:
			[Authorized Signature]
			[Name]
			[Title]

Schedule A

Subject to the terms and conditions of the Agreement, the Employee shall earn a percentage of Performance Share Units based on the following two steps.

First, the number of Performance Share Units will be determined based on the following chart:

	Performance Metrics
Percentage of Performance Share Units Earned	Average Three-Year After-Tax Operating Earnings Per Share	Average Three-Year Return on Equity
50%	$2.66	8.56%
63%	$2.88	9.27%
75%	$3.11	9.98%
88%	$3.33	10.7%
100%	$3.55	11.41%
113%	$3.68	11.84%
125%	$3.82	12.27%
138%	$3.95	12.69%
150%	$4.08	13.12%

Each of the performance metrics above shall be weighted equally at 50 percent. Results that are in between the numbers appearing on the chart shall be interpolated on a straight line basis.

Second, the final number of Performance Share Units earned will be determined by adjusting the number of Performance Share Units derived from the chart above and multiplying it by the TSR Factor as set forth in the chart below based on the Percentage Relative TSR Performance (as defined below):

Percentage Relative TSR Performance	TSR Factor
75% or above	1.2
62.5%	1.1
50%	1.0
42.5%	0.9
35% or below	0.8

If the Percentage Relative TSR Performance is between 75% and 35%, the results shall be interpolated on a straight line basis.

“Additional Adjustment Items” shall mean any of the following to the extent not included or assumed in the Company's financial plans for fiscal years 2013 to 2015 as of the date of this Agreement: (i) adjustments resulting from accounting policy changes, legal or regulatory rule or law changes; (ii) the impact of any acquisitions, divestitures or block reinsurance transactions; (iii) adjustments to the closed block of business; (iv) the effect of any regulatory, legal or tax settlements; (v) the effect of changes to strategic asset allocation; (vi) debt issuance, repurchasing or retirement, or stock repurchase or issuance; (vii) the effect of differences between actual foreign currency exchange rates and those assumed in the financial plans; and (viii) fees or assessments, including tax assessments, from legislation enacted after the date hereof.

“After-Tax Operating Earnings Per Share” shall mean, with respect to a fiscal year, the Company's after-tax net income or loss for such fiscal year, adjusted to exclude after-tax net realized investment gains or losses and after-tax non-operating retirement-related gains or losses and any Additional Adjustment Items (“After-Tax Operating Earnings”), divided by the weighted-average number of shares of common stock of the Company outstanding for such fiscal year (assuming dilution).

“Average Three-Year After-Tax Operating Earnings Per Share” shall mean the average of the After-Tax Operating Earnings Per Share for each of the Company's fiscal years ending on December 31, 2013, 2014 and 2015.

“Average Three-Year Return on Equity” shall mean the average of the Return on Equity for each of the Company's fiscal years ending on December 31, 2013, 2014 and 2015.

“Percentage Relative TSR Performance” shall mean the Company's Total Shareholder Return (as defined below) as compared to the Total Shareholder Returns of the following group of specified peers: Aflac Incorporated; Assurant, Inc.; The Hartford Financial Services Group, Inc.; Lincoln National Corporation; MetLife, Inc.; Principal Financial Group, Inc.; Protective Life Corporation; Prudential Financial, Inc.; StanCorp Financial Group, Inc.; and Torchmark Corporation (the “Peer Group”). The Percentage Relative TSR Performance shall be calculated by dividing the number of companies in the Peer Group with Total Shareholder Returns that are the same or lower than the Company's Total Shareholder Return by the total number of companies being compared, including the Company and each company in the Peer Group, expressed as a percentage. A company shall be removed from the Peer Group if it: (i) ceases to be a domestically domiciled publicly traded company on a national stock exchange or market system, unless such cessation of such listing is due to a low stock price or low trading volume; (ii) has gone private; (iii) has reincorporated in a foreign (e.g., non-U.S.) jurisdiction, regardless of whether it is a reporting company in that or another jurisdiction; or (iv) has been acquired by another company (whether by another company in the Peer Group or otherwise, but not including internal reorganizations), or has sold all or substantially all of its assets. A company that is removed from the Peer Group before the end of the Performance Period will be excluded from the calculation of Percentage Relative TSR Performance.

“Return on Equity” shall mean, with respect to a fiscal year, the Company's After-Tax Operating Earnings for such fiscal year divided by the average of the beginning and end of year stockholders' equity for such fiscal year, adjusted to exclude the accumulated net unrealized gain or loss on securities, the accumulated net gain or loss on cash flow hedges and any Additional Adjustment Items, expressed as a percentage.

“Total Shareholder Return” shall mean total shareholder return as applied to the Company or any company in the Peer Group, determined by comparing the average of the applicable company's closing stock prices over the 20 trading days immediately preceding the first day of the Performance Period with the average of the applicable company's closing stock prices over the last 20 trading days of the Performance Period, including dividends and distributions made or, with respect to which a record date has occurred, declared (assuming such dividends or distributions are reinvested in the common stock of the Company or any company in the Peer Group) during the Performance Period.

EX-15

EXHIBIT 15

LETTER RE: UNAUDITED INTERIM FINANCIAL INFORMATION

Board of Directors and Stockholders

Unum Group

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

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

a. Provident Companies, Inc. Stock Plan of 1999

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

c. Employee Stock Option Plan of 1998

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

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

a. UnumProvident Corporation Stock Plan of 1999

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

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

d. UnumProvident Corporation Broad-Based Stock Plan of 2002

e. UnumProvident Corporation Employee Stock Option Plan,

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

a. UnumProvident Corporation Amended and Restated Employee Stock Purchase Plan

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

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

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

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

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

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

of our report dated May 2, 2013 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, 2013.

/s/ ERNST & YOUNG LLP

Chattanooga, Tennessee

May 2, 2013

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, 2013	/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, 2013	/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, 2013 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, 2013	/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, 2013 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, 2013	/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 Geographic Region (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans	$ 1,730.4	$ 1,712.7
Percent of Total	100.00%	100.00%
New England
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans	113.2	114.3
Percent of Total	6.50%	6.70%
Mid-Atlantic
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans	158.9	160.0
Percent of Total	9.20%	9.30%
East North Central
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans	233.1	224.7
Percent of Total	13.50%	13.10%
West North Central
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans	158.0	160.8
Percent of Total	9.10%	9.40%
South Atlantic
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans	437.8	440.9
Percent of Total	25.30%	25.70%
East South Central
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans	79.1	79.6
Percent of Total	4.60%	4.70%
West South Central
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans	157.8	159.5
Percent of Total	9.10%	9.30%
Mountain
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans	89.6	90.5
Percent of Total	5.20%	5.30%
Pacific
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans	$ 302.9	$ 282.4
Percent of Total	17.50%	16.50%

XML

Schedule of Other Comprehensive Income (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012	Dec. 31, 2011
Changes in Components of Accumulated Other Comprehensive Income [Line Items]
Stockholders' Equity Attributable to Parent	$ 8,557.8	$ 8,179.9	$ 8,612.6
Other Comprehensive Income (Loss), Net of Tax	(142.3)	(6.4)
Total Reclassification Adjustments from AOCI to Net Income, Net of Tax	0.4
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax [Abstract]
Reclassification Adjustment for Sale of Securities Included in Net Income, Net of Tax	(7.8)
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax	(278.5)	(197.2)
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax [Abstract]
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain from Cash Flow Hedges, Effect Net of Tax	399.6		401.6
Other Comprehensive Income (Loss), Unrealized (Loss) on Derivatives Arising During Period, Net of Tax	(1.2)
Cash Flow Hedge Gain Reclassified to Earnings, Net of Tax	(0.8)
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax	(2.0)	(10.7)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax [Abstract]
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax	(142.5)		(72.6)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Loss Arising During Period, Net of Tax	(69.9)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment Realized upon Sale or Liquidation, Net of Tax	0
Change in Foreign Currency Translation Adjustment	(69.9)	28.2
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax [Abstract]
Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax	(563.8)		(574.5)
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain Arising During Period, Net of Tax	1.7
Reclassification Adjustment on Pension and Other Postretirement Benefit Plans, Net Loss Recognized in Net Periodic Benefit Cost, Net of Tax	9.0
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax	10.7
Accumulated Other Comprehensive Income [Member]
Changes in Components of Accumulated Other Comprehensive Income [Line Items]
Stockholders' Equity Attributable to Parent	485.7	455.4	628.0	461.8
Other Comprehensive Income (Loss), Net of Tax	(142.3)	(6.4)
Before Reclassification Adjustment [Member]
Changes in Components of Accumulated Other Comprehensive Income [Line Items]
Other Comprehensive Income (Loss), Net of Tax	(142.7)
Includes Unrealized Adjustment for Deferred Policy Acquisition Costs and Reserves for Future Policy and Contract Benefits [Member]
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax [Abstract]
Accumulated Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax	792.4		873.5
Other Comprehensive Income (Loss), Unrealized Holding (Loss) on Securities Arising During Period, Net of Tax	(73.3)
Reclassification Adjustment for Sale of Securities Included in Net Income, Net of Tax	(7.8)
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax	$ (81.1)

XML

Notional Amounts for Each Category of Derivative Activity (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Derivative [Line Items]
Balance at beginning of period	$ 1,432.8	$ 1,413.0
Additions	94.0	35.0
Terminations	82.0	83.9
Balance at ending of period	1,444.8	1,364.1
Credit Default Swap [Member]
Derivative [Line Items]
Additions	70.0
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	508.8	554.0
Additions	0	0
Terminations	18.0	3.9
Balance at ending of period	490.8	550.1
Swaps | Receive Fixed/Pay Variable
Derivative [Line Items]
Balance at beginning of period	750.0	685.0
Additions	0	0
Terminations	40.0	45.0
Balance at ending of period	710.0	640.0
Swaps | Credit Default Swap [Member]
Derivative [Line Items]
Balance at beginning of period	0	0
Additions	70.0	0
Terminations	0	0
Balance at ending of period	70.0	0
Forwards
Derivative [Line Items]
Balance at beginning of period	0	0
Additions	24.0	35.0
Terminations	24.0	35.0
Balance at ending of period	$ 0	$ 0

XML

Schedule of Net Unrealized Gain on Securities (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended				3 Months Ended		3 Months Ended		3 Months Ended		3 Months Ended		3 Months Ended		3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013 Debt Securities [Member]	Dec. 31, 2012 Debt Securities [Member]	Mar. 31, 2013 Other Investments [Member]	Dec. 31, 2012 Other Investments [Member]	Mar. 31, 2013 Deferred Acquisition Costs [Member]	Dec. 31, 2012 Deferred Acquisition Costs [Member]	Mar. 31, 2013 Reserve for Future Policy and Contract Benefits [Member]	Dec. 31, 2012 Reserve for Future Policy and Contract Benefits [Member]	Mar. 31, 2013 Reinsurance Recoverable [Member]	Dec. 31, 2012 Reinsurance Recoverable [Member]	Mar. 31, 2013 Deferred Income Tax Charges [Member]	Dec. 31, 2012 Deferred Income Tax Charges [Member]	Mar. 31, 2013 Includes Unrealized Adjustment for Deferred Policy Acquisition Costs and Reserves for Future Policy and Contract Benefits [Member]	Dec. 31, 2012 Includes Unrealized Adjustment for Deferred Policy Acquisition Costs and Reserves for Future Policy and Contract Benefits [Member]
Schedule of Net Unrealized Gain on Securities [Line Items]
Accumulated Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax			$ 6,803.9	$ 7,221.5	$ 72.5	$ 92.8	$ (61.2)	$ (67.0)	$ (5,979.7)	$ (6,277.5)	$ 353.9	$ 351.5	$ (397.0)	$ (447.8)	$ 792.4	$ 873.5
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax	$ (278.5)	$ (197.2)	$ (417.6)		$ (20.3)		$ 5.8		$ 297.8		$ 2.4		$ 50.8		$ (81.1)

XML

Realized Investment Gains and Losses Reported in Consolidated Statements of Income (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Gain (Loss) on Investments [Line Items]
Available for Sale Securities Other Than Temporary Impairments in Accumulated Other Comprehensive Income Loss	$ 0		$ 0
Fixed Maturity Securities
Gross Gains on Sales	6.6	5.9
Gross Losses on Sales	(5.5)	(5.0)
Other-Than-Temporary Impairment Loss	(0.8)	0
Mortgage Loans and Other Invested Assets
Gross Gains on Sales	7.6	0
Impairment Loss	(1.0)	(0.5)
Embedded Derivative, Gain (Loss) on Embedded Derivative, Net	6.4	12.3
Derivative, Gain (Loss) on Derivative, Net	(0.3)	0
Foreign Currency Transactions	(2.7)	(0.3)
Net Realized Investment Gain (Loss)	$ 10.3	$ 12.4

XML

Quantitative Information Regarding Significant Unobservable Inputs (Details) (Fair Value, Inputs, Level 3 [Member], USD $) In Millions, unless otherwise specified	3 Months Ended		12 Months Ended
	Mar. 31, 2013		Dec. 31, 2012
Embedded Derivative Financial Instruments [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Fair Value Measurements, Significant Assumptions	Actuarial Assumptions	[1]	Actuarial Assumptions	[1]
Embedded Derivative, Fair Value of Embedded Derivative Liability	$ (77.5)		$ (83.9)
Fair Value Measurements, Valuation Techniques	- Projected Liability Cash Flows		- Projected Liability Cash Flows
US States and Political Subdivisions Debt Securities [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Fair Value Measurements, Significant Assumptions	0.25% - 1.25% / 0.74%		0.25% - 0.25% / 0.25% 0.25% - 0.25% / 0.25% 0.15% - 0.15% / 0.15%
Fair value of fixed maturity securities	126.5		42.7
Fair Value Measurements, Valuation Techniques	- Comparability Adjustment		- Comparability Adjustment - Lack of Marketability - Volatility of Credit
US States and Political Subdivisions Debt Securities [Member] | Minimum [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Fair Value Inputs, Comparability Adjustments	0.25%	[2]	0.25%	[2]
Fair Value Inputs, Entity Credit Risk			0.15%	[3]
Fair Value Inputs, Discount for Lack of Marketability			0.25%	[4]
US States and Political Subdivisions Debt Securities [Member] | Maximum [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Fair Value Inputs, Comparability Adjustments	1.25%	[2]	0.25%	[2]
Fair Value Inputs, Entity Credit Risk			0.15%	[3]
Fair Value Inputs, Discount for Lack of Marketability			0.25%	[4]
US States and Political Subdivisions Debt Securities [Member] | Weighted Average [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Fair Value Inputs, Comparability Adjustments	0.74%	[2]	0.25%	[2]
Fair Value Inputs, Entity Credit Risk			0.15%	[3]
Fair Value Inputs, Discount for Lack of Marketability			0.25%	[4]
Public Utilities
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Fair Value Measurements, Significant Assumptions	0.25% - 0.30% / 0.27% 0.25% - 0.25% / 0.25%		0.20% - 0.20% / 0.20%
Fair value of fixed maturity securities	89.2		17.4
Fair Value Measurements, Valuation Techniques	- Comparability Adjustment - Volatility of Credit		- Comparability Adjustment
Public Utilities | Minimum [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Fair Value Inputs, Comparability Adjustments	0.25%	[2]	0.20%	[2]
Fair Value Inputs, Entity Credit Risk	0.25%	[3]
Public Utilities | Maximum [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Fair Value Inputs, Comparability Adjustments	0.30%	[2]	0.20%	[2]
Fair Value Inputs, Entity Credit Risk	0.25%	[3]
Public Utilities | Weighted Average [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Fair Value Inputs, Comparability Adjustments	0.27%	[2]	0.20%	[2]
Fair Value Inputs, Entity Credit Risk	0.25%	[3]
Asset-backed Securities [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Fair Value Measurements, Significant Assumptions	5.76% - 5.86% / 5.84%		5.74% - 5.84% / 5.81%
Fair value of fixed maturity securities	0.5		0.5
Fair Value Measurements, Valuation Techniques	- Discount for Size		- Discount for Size
Asset-backed Securities [Member] | Minimum [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Fair Value Inputs, Discount for Size	5.76%	[5]	5.74%	[5]
Asset-backed Securities [Member] | Maximum [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Fair Value Inputs, Discount for Size	5.86%	[5]	5.84%	[5]
Asset-backed Securities [Member] | Weighted Average [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Fair Value Inputs, Discount for Size	5.84%	[5]	5.81%	[5]
All Other Corporate Bonds - Private
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Fair Value Measurements, Significant Assumptions	0.75% - 3.20% / 1.07% (0.54)% - (0.08)% / (0.37)% 0.50% - 0.50% / 0.50% 0.50% - 1.00% / 0.76% 0.50% - 7.72% / 1.60% Priced at Par		0.04% - 2.89% / 0.28% 1.48% - 1.48% / 1.48% 0.10% - 0.50% / 0.24% 0.10% - 1.00% / 0.46% (0.25)% -7.72% / 1.51% Priced at Par
Fair value of fixed maturity securities	237.5		391.8
Fair Value Measurements, Valuation Techniques	- Change in Benchmark Reference - Comparability Adjustment - Discount for Size - Lack of Marketability - Volatility of Credit - Market Convention		- Change in Benchmark Reference - Comparability Adjustment - Discount for Size - Lack of Marketability - Volatility of Credit - Market Convention
All Other Corporate Bonds - Private | Market Convention [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Fair Value Measurements, Significant Assumptions	Priced at Par	[6]	Priced at Par	[6]
All Other Corporate Bonds - Private | Minimum [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Fair Value Inputs, Comparability Adjustments	(0.54%)	[2]	1.48%	[2]
Fair Value Inputs, Entity Credit Risk	0.50%	[3]	(0.25%)	[3]
Fair Value Inputs, Discount for Size	0.50%	[5]	0.10%	[5]
Fair Value Inputs, Change in Benchmark Reference	0.75%	[7]	0.04%	[7]
Fair Value Inputs, Discount for Lack of Marketability	0.50%	[4]	0.10%	[4]
All Other Corporate Bonds - Private | Maximum [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Fair Value Inputs, Comparability Adjustments	(0.08%)	[2]	1.48%	[2]
Fair Value Inputs, Entity Credit Risk	7.72%	[3]	7.72%	[3]
Fair Value Inputs, Discount for Size	0.50%	[5]	0.50%	[5]
Fair Value Inputs, Change in Benchmark Reference	3.20%	[7]	2.89%	[7]
Fair Value Inputs, Discount for Lack of Marketability	1.00%	[4]	1.00%	[4]
All Other Corporate Bonds - Private | Weighted Average [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Fair Value Inputs, Comparability Adjustments	(0.37%)	[2]	1.48%	[2]
Fair Value Inputs, Entity Credit Risk	1.60%	[3]	1.51%	[3]
Fair Value Inputs, Discount for Size	0.50%	[5]	0.24%	[5]
Fair Value Inputs, Change in Benchmark Reference	1.07%	[7]	0.28%	[7]
Fair Value Inputs, Discount for Lack of Marketability	0.76%	[4]	0.46%	[4]
Corporate Bond Securities - Public
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Fair Value Measurements, Significant Assumptions	(0.88)% - (0.88)% / (0.88)% (0.30)% - 1.00% / 0.10% (0.57)% - (0.57)% / (0.57)% 0.05% - 0.20% / 0.13% (0.30)% - 0.30% / 0.10%		0.25% - 0.25% / 0.25% (0.59)% - 1.00% / 0.27% 0.25% - 0.25% / 0.25% 0.20% - 0.30% / 0.24% (0.30)% - (0.30)% / (0.30)% Priced at Par
Fair value of fixed maturity securities	328.4		165.0
Fair Value Measurements, Valuation Techniques	- Change in Benchmark Reference - Comparability Adjustment - Discount for Size - Lack of Marketability - Volatility of Credit		- Change in Benchmark Reference - Comparability Adjustment - Discount for Size - Lack of Marketability - Volatility of Credit - Market Convention
Corporate Bond Securities - Public | Market Convention [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Fair Value Measurements, Significant Assumptions			Priced at Par	[6]
Corporate Bond Securities - Public | Minimum [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Fair Value Inputs, Comparability Adjustments	(0.30%)	[2]	(0.59%)	[2]
Fair Value Inputs, Entity Credit Risk	(0.30%)	[3]	(0.30%)	[3]
Fair Value Inputs, Discount for Size	(0.57%)	[5]	0.25%	[5]
Fair Value Inputs, Change in Benchmark Reference	(0.88%)	[7]	0.25%	[7]
Fair Value Inputs, Discount for Lack of Marketability	0.05%	[4]	0.20%	[4]
Corporate Bond Securities - Public | Maximum [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Fair Value Inputs, Comparability Adjustments	1.00%	[2]	1.00%	[2]
Fair Value Inputs, Entity Credit Risk	0.30%	[3]	(0.30%)	[3]
Fair Value Inputs, Discount for Size	(0.57%)	[5]	0.25%	[5]
Fair Value Inputs, Change in Benchmark Reference	(0.88%)	[7]	0.25%	[7]
Fair Value Inputs, Discount for Lack of Marketability	0.20%	[4]	0.30%	[4]
Corporate Bond Securities - Public | Weighted Average [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Fair Value Inputs, Comparability Adjustments	0.10%	[2]	0.27%	[2]
Fair Value Inputs, Entity Credit Risk	0.10%	[3]	(0.30%)	[3]
Fair Value Inputs, Discount for Size	(0.57%)	[5]	0.25%	[5]
Fair Value Inputs, Change in Benchmark Reference	(0.88%)	[7]	0.25%	[7]
Fair Value Inputs, Discount for Lack of Marketability	0.13%	[4]	0.24%	[4]
Equity Securities [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Fair Value Measurements, Significant Assumptions	Priced at Cost or Owner's Equity	[6]	Priced at Cost or Owner's Equity	[6]
Available-for-sale Securities, Equity Securities	$ 4.0		$ 4.0
Fair Value Measurements, Valuation Techniques	- Market Convention		- Market Convention

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

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

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

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

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

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

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

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Premium Income by Major Line of Business within Each Segment (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Segment Reporting Information [Line Items]
Premiums Earned, Net	$ 1,930.9	$ 1,921.9
Unum U.S.
Segment Reporting Information [Line Items]
Premiums Earned, Net	1,139.7	1,112.0
Unum U.S. | Group Long term Disability
Segment Reporting Information [Line Items]
Premiums Earned, Net	392.7	395.5
Unum U.S. | Group Short term Disability [Member]
Segment Reporting Information [Line Items]
Premiums Earned, Net	131.0	117.7
Unum U.S. | Group Life [Member]
Segment Reporting Information [Line Items]
Premiums Earned, Net	302.2	293.6
Unum U.S. | Accidental Death & Dismemberment
Segment Reporting Information [Line Items]
Premiums Earned, Net	30.9	28.3
Unum U.S. | Individual Disability-Recently Issued
Segment Reporting Information [Line Items]
Premiums Earned, Net	120.1	118.4
Unum U.S. | Voluntary Benefits
Segment Reporting Information [Line Items]
Premiums Earned, Net	162.8	158.5
Unum U.K.
Segment Reporting Information [Line Items]
Premiums Earned, Net	143.8	170.7
Unum U.K. | Group Long term Disability UK
Segment Reporting Information [Line Items]
Premiums Earned, Net	97.9	101.9
Unum U.K. | Group Life UK
Segment Reporting Information [Line Items]
Premiums Earned, Net	31.0	52.7
Unum U.K. | Supplemental and Voluntary UK
Segment Reporting Information [Line Items]
Premiums Earned, Net	14.9	16.1
Colonial Life
Segment Reporting Information [Line Items]
Premiums Earned, Net	307.1	296.3
Colonial Life | Accident, Sickness, and Disability - Colonial
Segment Reporting Information [Line Items]
Premiums Earned, Net	184.8	180.2
Colonial Life | Life Colonial [Member]
Segment Reporting Information [Line Items]
Premiums Earned, Net	54.8	51.7
Colonial Life | Cancer and Critical Illness - Colonial
Segment Reporting Information [Line Items]
Premiums Earned, Net	67.5	64.4
Closed Block
Segment Reporting Information [Line Items]
Premiums Earned, Net	340.3	342.9
Closed Block | Individual Disability Closed Block
Segment Reporting Information [Line Items]
Premiums Earned, Net	181.8	187.2
Closed Block | Long-term Care
Segment Reporting Information [Line Items]
Premiums Earned, Net	158.8	155.2
Closed Block | All Other Segments
Segment Reporting Information [Line Items]
Premiums Earned, Net	$ (0.3)	$ 0.5

XML

Accumulated Other Comprehensive Income (Tables)

3 Months Ended

Mar. 31, 2013

Notes to Financial Statements [Abstract]

Schedule of Comprehensive Income (Loss) [Table Text Block]

After-tax accumulated other comprehensive income (loss) balances and related changes are as follows:

		Net Unrealized Gain on Securities			Net Gain on Cash Flow Hedges			Foreign Currency Translation Adjustment			Unrecognized Pension and Postretirement Benefit Costs			Total
		(in millions of dollars)
Balance at December 31, 2012		$	873.5		$	401.6		$	(72.6	)	$	(574.5	)	$	628.0
	Other Comprehensive Income (Loss) Before Reclassifications	(73.3		)	(1.2		)	(69.9		)	1.7			(142.7		)
	Amounts Reclassified from Accumulated Other Comprehensive Income or Loss	(7.8		)	(0.8		)	—			9.0			0.4
	Net Other Comprehensive Income (Loss)	(81.1		)	(2.0		)	(69.9		)	10.7			(142.3		)
Balance at March 31, 2013		$	792.4		$	399.6		$	(142.5	)	$	(563.8	)	$	485.7

Schedule of Net Unrealized Gain on Securities [Table Text Block]

The net unrealized gain on securities consists of the following components:

	March 31			December 31
	2013			2012			Change
	(in millions of dollars)
Fixed Maturity Securities	$	6,803.9		$	7,221.5		$	(417.6	)
Other Investments	72.5			92.8			(20.3		)
Deferred Acquisition Costs	(61.2		)	(67.0		)	5.8
Reserves for Future Policy and Contract Benefits	(5,979.7		)	(6,277.5		)	297.8
Reinsurance Recoverable	353.9			351.5			2.4
Deferred Income Tax	(397.0		)	(447.8		)	50.8
Total	$	792.4		$	873.5		$	(81.1	)

Schedule of Reclassifications from Accumulated Other Comprehensive Income to Income [Table Text Block]

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

			Three Months Ended March 31, 2013
			(in millions of dollars)
Net Unrealized Gain on Securities
	Net Realized Investment Gain
		Gain on Disposals of Securities and Other Invested Assets	$	11.9
	Income Tax		4.1
	Total		$	7.8
Net Gain on Cash Flow Hedges
	Net Investment Income
		Gain on Interest Rate Swaps and Forwards	$	10.0
		Loss on Foreign Exchange Contracts	(1.7		)
	Net Realized Investment Gain
		Loss on Foreign Exchange Contracts	(6.7		)
	Interest and Debt Expense
		Loss on Interest Rate Swaps	(0.4		)
			1.2
	Income Tax		0.4
	Total		$	0.8
Unrecognized Pension and Postretirement Benefit Costs
	Other Expenses
		Amortization of Net Actuarial Loss	$	(14.9	)
		Amortization of Prior Service Credit	1.2
			(13.7		)
	Income Tax Benefit		(4.7		)
	Total		$	(9.0	)

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Location and Fair Values of Derivative Financial Instruments (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Derivative [Line Items]
Asset Derivatives Fair Value	$ 62.1	$ 81.6
Liability Derivatives Fair Value	157.4	170.5
Designated as Hedging Instrument | Other Long-term Investments [Member]
Derivative [Line Items]
Asset Derivatives Fair Value	62.1	81.6
Designated as Hedging Instrument | Other Liability
Derivative [Line Items]
Liability Derivatives Fair Value	156.7	170.5
Designated as Hedging Instrument | Interest Rate Swap [Member] | Other Long-term Investments [Member]
Derivative [Line Items]
Asset Derivatives Fair Value	59.6	76.5
Designated as Hedging Instrument | Interest Rate Swap [Member] | Other Liability
Derivative [Line Items]
Liability Derivatives Fair Value	31.2	31.7
Designated as Hedging Instrument | Foreign Exchange Contract [Member] | Other Long-term Investments [Member]
Derivative [Line Items]
Asset Derivatives Fair Value	2.5	5.1
Designated as Hedging Instrument | Foreign Exchange Contract [Member] | Other Liability
Derivative [Line Items]
Liability Derivatives Fair Value	125.5	138.8
Not Designated as Hedging Instrument | Other Liability
Derivative [Line Items]
Liability Derivatives Fair Value	78.2
Not Designated as Hedging Instrument | Credit Default Swap [Member] | Other Liability
Derivative [Line Items]
Liability Derivatives Fair Value	0.7
Not Designated as Hedging Instrument | Embedded Derivative in Modified Coinsurance Arrangement | Other Liability
Derivative [Line Items]
Liability Derivatives Fair Value	$ 77.5	$ 83.9

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Activity in Allowance for Credit Losses (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance at Beginning of Year	$ 1.5	$ 1.5
Provisions	0	0.5
Balance at End of Period	$ 1.5	$ 2.0

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Distribution of the Maturity Dates for Fixed Maturity Securities (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Available-for-Sale Securities, Total Amortized Cost
1 year or less	$ 1,059.7	$ 956.4
Over 1 year through 5 years	5,927.8	5,922.8
Over 5 years through 10 years	9,756.5	9,752.3
Over 10 years	19,121.5	19,192.1
Available-for-sale Securities, Debt Maturities, Gross Subtotal	35,865.5	35,823.6
Mortgage/Asset-Backed Securities	1,767.1	1,927.9
Total Fixed Maturity Securities	37,632.6	37,751.5
Available-for-Sale Securities, Unrealized Gain Position, Gross Gain
1 year or less	23.6	21.2
Over 1 year through 5 years	654.8	628.1
Over 5 years through 10 years	1,548.7	1,606.4
Over 10 years	4,347.5	4,732.7
Available-For-Sale Securities, Debt Maturities Unrealized Gain Position, Gross Gain, Gross Subtotal, Total	6,574.6	6,988.4
Mortgage/Asset-Backed Securities	275.6	289.1
Total Fixed Maturity Securities	6,850.2	7,277.5
Available-for-Sale Securities, Unrealized Loss Position, Gross Loss
1 year or less	0.2	0.5
Over 1 year through 5 years	1.7	5.0
Over 5 years through 10 years	8.0	7.6
Over 10 years	35.9	42.4
Available-For-Sale Securities, Debt Maturities Unrealized Gain Position, Gross Loss, Gross Subtotal, Total	45.8	55.5
Mortgage/Asset-Backed Securities	0.5	0.5
Total Fixed Maturity Securities	46.3	56.0
Available-for-Sale Securities, Unrealized Gain Position, Fair Value
Fair Value Maturity Distribution [Abstract]
1 year or less	1,040.1	934.1
Over 1 year through 5 years	6,501.5	6,449.8
Over 5 years through 10 years	10,799.5	10,997.0
Over 10 years	22,461.7	23,200.2
Available-for-sale Securities, Debt Maturities, Fair Value, Gross Subtotal, Total	40,802.8	41,581.1
Mortgage/Asset-Backed Securities	2,035.9	2,208.3
Fair value of fixed maturity securities	42,838.7	43,789.4
Available-for-Sale Securities, Unrealized Loss Position, Fair Value
Fair Value Maturity Distribution [Abstract]
1 year or less	43.0	43.0
Over 1 year through 5 years	79.4	96.1
Over 5 years through 10 years	497.7	354.1
Over 10 years	971.4	682.2
Available-for-sale Securities, Debt Maturities, Fair Value, Gross Subtotal, Total	1,591.5	1,175.4
Mortgage/Asset-Backed Securities	6.3	8.2
Fair value of fixed maturity securities	$ 1,597.8	$ 1,183.6

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Location of and Gain (Loss) on Derivative Financial Instruments Not Designated as Cash Flow Hedging Instruments (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in Net Realized Investment Gain	$ 6.4	$ 12.3
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	6.1	12.3
Credit Default Swap [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments, Gain (Loss) Recognized in Income, Net	$ (0.3)	$ 0

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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, 2013	Mar. 31, 2012
Pension Benefits, U.S. Plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service Cost	$ 14.9	$ 12.2
Interest Cost	21.9	21.1
Expected Return on Plan Assets	(25.5)	(22.2)
Amortization of Net Actuarial Loss	14.6	11.5
Amortization of Prior Service Credit	0	(0.1)
Total	25.9	22.5
Pension Benefits, Non U.S. Plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service Cost	1.1	1.2
Interest Cost	2.1	2.1
Expected Return on Plan Assets	(3.0)	(2.7)
Amortization of Net Actuarial Loss	0.3	0.1
Amortization of Prior Service Credit	0	0
Total	0.5	0.7
Other Postretirement Benefit Plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service Cost	0.2	0.4
Interest Cost	2.0	2.4
Expected Return on Plan Assets	(0.2)	(0.2)
Amortization of Net Actuarial Loss	0	0
Amortization of Prior Service Credit	(1.2)	(0.6)
Total	$ 0.8	$ 2.0

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Investments - Additional Information (Detail) (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Schedule of Investments [Line Items]
Available for Sale Securities Other Than Temporary Impairments in Accumulated Other Comprehensive Income Loss	$ 0		$ 0
Fair value of fixed maturity securities, gross unrealized gain	6,850,200,000		7,277,500,000
Fair Value of fixed maturity securities, gross unrealized loss	46,300,000		56,000,000
Defaults on securities not OTTI	0
Commitment to fund private placement fixed maturity securities	153,000,000
Carrying amount of variable interest entity investments	431,700,000
Unfunded commitment to fund Investment Partnerships	75,700,000
Commitment to fund partnership Equity Investments	107,800,000
Other Long-term Investments	592,800,000		625,000,000
Commitments to Fund Special Purpose Entities	0
Mortgage Loan policy is not to exceed a loan-to-value ratio, percent	75.00%
Loan to Value Ratio Update Frequency	3 years
Mortgage Loan Inspection Frequency	2 years
Mortage Loan Policy Debt Service coverage ratio lower range	125.00%
Mortgage Loans issuance, term years	25
Impaired Financing Receivable, Average Recorded Investment	17,400,000
Impaired Financing Receivable, Interest Income, Accrual Method	200,000	200,000
Foreclosed Real Estate Expense	0	0
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	0		0
Financing Receivable, Recorder Investment, Nonaccrual status	1		1
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	4,300,000		4,300,000
Committments to Fund Commercial Mortgage Loans	48,200,000
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%
Securities Loaned	234,000,000		452,800,000
Cash Collateral for Borrowed Securities	236,300,000		455,800,000
Securities Received as Collateral	0		0
Outstanding Repurchase Agreements	0		0
Nonperforming Financing Receivable [Member]
Schedule of Investments [Line Items]
Amount of days past due-DelinquentMortgageLoan	90 days		90 days
Off Balance Sheet Amount [Member]
Schedule of Investments [Line Items]
Securities Received as Collateral	6,500,000		14,500,000
Partnership Interests In Tax Credit Investments
Schedule of Investments [Line Items]
Carrying amount of variable interest entity investments	326,300,000
Equity Method Investments
Schedule of Investments [Line Items]
Carrying amount of variable interest entity investments	105,400,000
Bonds
Schedule of Investments [Line Items]
Fair value of fixed maturity securities	141,800,000
Partnership Interest
Schedule of Investments [Line Items]
Other Long-term Investments	6,700,000
External Credit Rating, Investment Grade
Schedule of Investments [Line Items]
Fair value of fixed maturity securities	41,295,100,000
Fair value of fixed maturity securities, gross unrealized gain	6,647,800,000
Fair Value of fixed maturity securities, gross unrealized loss	27,800,000
Fixed maturity securities in unrealized loss position, percent of total	60.00%
Number of fixed maturity securities that were in an unrealized loss position	64
Number of fixed maturity securities in an unrealized loss position continuously for over one year	15
External Credit Rating, Non Investment Grade
Schedule of Investments [Line Items]
Fair value of fixed maturity securities	3,141,400,000
Fair value of fixed maturity securities, gross unrealized gain	202,400,000
Fair Value of fixed maturity securities, gross unrealized loss	18,500,000
Fixed maturity securities in unrealized loss position, percent of total	40.00%
Number of fixed maturity securities that were in an unrealized loss position	33
Number of fixed maturity securities in an unrealized loss position continuously for over one year	14
Commercial Real Estate Portfolio Segment [Member]
Schedule of Investments [Line Items]
Financing Receivable, Modifications, Number of Contracts	0
Financing Receivable, Modifications, Subsequent Default, Number of Contracts			1
Financing Receivable, Modifications, Subsequent Default, Recorded Investment			$ 4,200,000

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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Cash Flows from Operating Activities
Net Income	$ 212.6	$ 213.9
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities
Change in Receivables	(130.1)	1.6
Change in Deferred Acquisition Costs	5.6	(18.0)
Change in Insurance Reserves and Liabilities	197.6	167.3
Change in Income Taxes	40.1	116.7
Change in Other Accrued Liabilities	23.4	(68.0)
Non-cash Adjustments to Net Investment Income	(96.1)	(100.9)
Net Realized Investment Gain	(10.3)	(12.4)
Depreciation	21.2	20.5
Other, Net	1.1	8.6
Net Cash Provided by Operating Activities	265.1	329.3
Cash Flows from Investing Activities
Proceeds from Sales of Fixed Maturity Securities	158.4	127.6
Proceeds from Maturities of Fixed Maturity Securities	518.5	596.3
Proceeds from Sales and Maturities of Other Investments	42.3	33.5
Purchase of Fixed Maturity Securities	(721.9)	(845.7)
Purchase of Other Investments	(43.4)	(52.6)
Net Sales (Purchases) of Short-term Investments	256.3	(17.2)
Other, Net	(26.1)	(23.7)
Net Cash Provided (Used) by Investing Activities	184.1	(181.8)
Cash Flows from Financing Activities
Net Short-term Debt Borrowings (Payments)	(219.5)	59.9
Long-term Debt Repayments	(71.2)	(17.5)
Issuance of Common Stock	0.7	0.9
Repurchase of Common Stock	(99.0)	(175.2)
Dividends Paid to Stockholders	(35.7)	(31.4)
Other, Net	0.2	1.7
Net Cash Used by Financing Activities	(424.5)	(161.6)
Net Increase (Decrease) in Cash and Bank Deposits	24.7	(14.1)
Cash and Bank Deposits at Beginning of Year	77.3	116.6
Cash and Bank Deposits at End of Period	$ 102.0	$ 102.5

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Pensions and Other Postretirement Benefits - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2013 Pension Benefits, U.S. Plans USD ($)	Mar. 31, 2013 Foreign Pension Plans, Defined Benefit [Member] USD ($)	Mar. 31, 2013 Foreign Pension Plans, Defined Benefit [Member] GBP (£)
Pension and Other Postretirement Benefits Disclosure [Line Items]
Description of Defined Contribution Pension and Other Postretirement Plans	We have no regulatory contribution requirements for our U.S. qualified defined benefit plan in 2013
Pension Contributions	$ 0	$ 1,000,000	£ 600,000

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Impaired Mortgage Loans (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Recorded Investment	$ 17.4	$ 17.4
Unpaid Principal Balance	18.9	18.9
Related Allowance	1.5	1.5
Impaired Fin Receivables with No Related Allowance [Member]
Recorded Investment	4.3	4.3
Unpaid Principal Balance	4.3	4.3
Related Allowance	0	0
Impaired Fin Receivables with Allowance [Member]
Recorded Investment	13.1	13.1
Unpaid Principal Balance	14.6	14.6
Related Allowance	$ 1.5	$ 1.5

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Carrying Amount and Fair Value of Financial Instruments (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Assets
Mortgage Loans	$ 1,730.4	$ 1,712.7
Policy Loans	3,141.4	3,133.8
Other Long Term Investments
Derivatives	62.1	81.6
Equity Securities	14.4	14.6
Policyholders' Funds
Long-term Debt	2,673.9	2,755.4
Other Liabilities
Derivatives	234.9	254.4
Unfunded commitment to fund Investment Partnerships	75.7
Carrying Amount
Assets
Fixed Maturity Securities	44,436.5	44,973.0
Mortgage Loans	1,730.4	1,712.7
Policy Loans	3,141.4	3,133.8
Other Long Term Investments
Derivatives	62.1	81.6
Equity Securities	14.4	14.6
Miscellaneous Long-Term Investments	438.4	455.1
Policyholders' Funds
Deferred Annuity Products	637.5	640.1
Supplementary Contracts without Life Contingencies	548.3	535.5
Long-term Debt	2,673.9	2,755.4
Other Liabilities
Derivatives	157.4	170.5
Embedded Derivative in Modified Coinsurance Arrangement	77.5	83.9
Unfunded commitment to fund Investment Partnerships	75.7	83.7
Fair Value
Assets
Fixed Maturity Securities	44,436.5	44,973.0
Mortgage Loans	1,959.8	1,937.1
Policy Loans	3,219.7	3,215.3
Other Long Term Investments
Derivatives	62.1	81.6
Equity Securities	14.4	14.6
Miscellaneous Long-Term Investments	438.4	455.1
Policyholders' Funds
Deferred Annuity Products	637.5	640.1
Supplementary Contracts without Life Contingencies	548.3	535.5
Long-term Debt	2,954.9	2,968.8
Other Liabilities
Derivatives	157.4	170.5
Embedded Derivative in Modified Coinsurance Arrangement	77.5	83.9
Unfunded commitment to fund Investment Partnerships	$ 75.7	$ 83.7

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Stockholders' Equity and Earnings Per Common Share (Tables)

3 Months Ended

Mar. 31, 2013

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
	2013		2012
	(in millions of dollars, except share data)
Numerator
Net Income	$	212.6	$	213.9
Denominator (000s)
Weighted Average Common Shares - Basic	269,361.1		290,429.5
Dilution for Assumed Exercises of Stock Options and Nonvested Stock Awards	993.3		854.5
Weighted Average Common Shares - Assuming Dilution	270,354.4		291,284.0
Net Income Per Common Share
Basic	$	0.79	$	0.74
Assuming Dilution	$	0.79	$	0.73

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Schedule of Reclassifications from Accumulated Other Comprehensive Income to Income (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013
Unrealized Gain on Securities Reclassified to Net Income
Reclassification Adjustment for Sale of Securities Included in Net Income, Tax	$ 4.1
Reclassification Adjustment for Sale of Securities Included in Net Income, Net of Tax	7.8
Gain on Cash Flow Hedges Reclassified to Net Income
Reclassification Adjustment on Derivatives Included in Net Income, before Tax	1.2
Reclassification Adjustment on Derivatives Included in Net Income, Tax	0.4
Cash Flow Hedge Gain Reclassified to Earnings, Net	0.8
Unrecognized Pension and Postretirement Benefit Costs Reclassified to Net Income
Total Pension and Other Postretirement Benefit Plans, Adjustment, before Tax	(13.7)
Reclassification Adjustment for Pension and Other Postretirement Benefit Plans, Net (Loss) Recognized in Net Periodic Benefit Cost, Tax	(4.7)
Reclassification Adjustment on Pension and Other Postretirement Benefit Plans, Net Loss Recognized in Net Periodic Benefit Cost, Net of Tax	(9.0)
Net Realized Investments Gain Loss [Member]
Unrealized Gain on Securities Reclassified to Net Income
Reclassification Adjustment for Sale of Securities Included in Net Income, before Tax	11.9
Other Expense [Member]
Unrecognized Pension and Postretirement Benefit Costs Reclassified to Net Income
Reclassification Adjustment on Pension and Other Postretirement Benefit Plans for Amortization of Net Actuarial Loss, before Tax	(14.9)
Amortization of Pension and Other Postretirement Benefit Plans, Net Prior Service Cost Recognized in Net Periodic Benefit Cost, before Tax	1.2
Interest Rate Swap [Member]
Gain on Cash Flow Hedges Reclassified to Net Income
Cash Flow Hedge Gain Reclassified to Net Investment Income	10.0
Cash Flow Hedge Loss Reclassified to Interest and Debt Expense	(0.4)
Foreign Exchange Contract [Member]
Gain on Cash Flow Hedges Reclassified to Net Income
Cash Flow Hedge Gain Reclassified to Net Investment Income	(1.7)
Foreign Exchange Contract [Member] | Net Realized Investments Gain Loss [Member]
Gain on Cash Flow Hedges Reclassified to Net Income
Cash Flow Hedge Loss Reclassified to Earnings	$ (6.7)

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Investments Offsetting for Derivatives and Securities Lending Balances (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Securities Lending [Abstract]
Securities Loaned	$ 234.0	$ 452.8
Securities Lending Agreements Offset in Balance Sheet	0	0
Securities Lending Asset Offsets [Abstract]
Securities Received as Collateral	0	0
Cash collateral offset against securities purchased	234.0	452.8
Net Exposure on Securities Purchased	0	0
Securities Lending Liability Offsets [Abstract]
Cash Collateral Pledged on Securities Lending Transactions	0	0
Cash Collateral for Borrowed Securities	236.3	455.8
Securities Lending Agreements, Net	2.3	3.0
Derivative Assets [Abstract]
Derivative Asset, Fair Value, Gross Asset	62.1	81.6
Derivative Asset, Fair Value, Amount Offset Against Collateral	0	0
Derivative Asset, Fair Value, Amount Not Offset Against Collateral	62.1	81.6
Financial Instruments Pledged as Collateral from Counterparty	(53.6)	(72.9)
Derivative, Collateral, Obligation to Return Cash	0	0
Derivative Asset, Fair Value, Net	8.5	8.7
Derivative Liabilities [Abstract]
Derivative Liability, Fair Value, Gross Liability	157.4	170.5
Derivative Liability, Fair Value, Amount Offset Against Collateral	0	0
Derivative Liability, Fair Value, Amount Not Offset Against Collateral	157.4	170.5
Financial Instruments Pledged as Collateral to Counterparty	(117.7)	(129.8)
Derivative, Collateral, Right to Reclaim Cash	1.8	1.8
Derivative Liability, Fair Value, Net	37.9	38.9
Financial Assets [Abstract]
Financial Assets Subject to Master Netting Arrangemetns Offset in the Balance Sheet	0	0
Total Cash Received as Collateral from Contracts with Master Netting Arrangements	(234.0)	(452.8)
Financial Assets Subject to Master Netting Arrangements Presented in Balance Sheet	296.1	534.4
Financial Assets Subject to Master Netting Arrangements, Gross	296.1	534.4
Financial Assets Subject to Master Netting Arrangements, Net	8.5	8.7
Total Financial Instruments Received as Collateral	(53.6)	(72.9)
Financial Liabilities [Abstract]
Financial Liabilities Subject to Master Netting Arrangements, Gross	393.7	626.3
Financial Liabilities Subject to Master Netting Arrangements Offset in the Balance Sheet	0	0
Financial Liabilities Subject to Master Netting Arrangements Presented in Balance Sheet	393.7	626.3
Total Financial Instruments Pledged as Collateral to Counterparty	(351.7)	(582.6)
Total Cash Pledged as Collateral on Contracts with Master Netting Arrangements	(1.8)	(1.8)
Financial Liabilities Subject to Master Netting Arrangements, Net	$ 40.2	$ 41.9

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Fair Value Measurements by Input Level (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Fixed Maturity Securities
Fixed Maturity Securities	$ 44,436.5	$ 44,973.0
Other Long-term Investments
Derivative Assets	62.1	81.6
Equity Securities
Equity Securities	14.4	14.6
Other Liabilities
Derivative Liabilities	234.9	254.4
Interest Rate Swaps
Other Long-term Investments
Derivative Assets	59.6	76.5
Other Liabilities
Derivative Liabilities	31.2	31.7
Foreign Exchange Contracts
Other Long-term Investments
Derivative Assets	2.5	5.1
Other Liabilities
Derivative Liabilities	125.5	138.8
Credit Default Swaps
Other Liabilities
Derivative Liabilities	0.7
Embedded Derivative in Modified Coinsurance Arrangement
Other Liabilities
Derivative Liabilities	77.5	83.9
United States Government and Government Agencies and Authorities
Fixed Maturity Securities
Fixed Maturity Securities	1,335.1	1,348.8
States, Municipalities, and Political Subdivisions
Fixed Maturity Securities
Fixed Maturity Securities	1,853.8	1,806.8
Foreign Governments
Fixed Maturity Securities
Fixed Maturity Securities	1,457.8	1,507.0
Public Utilities
Fixed Maturity Securities
Fixed Maturity Securities	11,089.2	11,144.2
Mortgage/Asset-backed Securities
Fixed Maturity Securities
Fixed Maturity Securities	2,042.2	2,216.5
All Other Corporate Bonds
Fixed Maturity Securities
Fixed Maturity Securities	26,619.1	26,910.4
Redeemable Preferred Stocks
Fixed Maturity Securities
Fixed Maturity Securities	39.3	39.3
Fair Value, Inputs, Level 1 [Member]
Fixed Maturity Securities
Fixed Maturity Securities	4,237.3	2,218.4
Other Long-term Investments
Derivative Assets	0	0
Equity Securities
Equity Securities	0	0
Other Liabilities
Derivative Liabilities	0	0
Fair Value, Inputs, Level 1 [Member] | Interest Rate Swaps
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] | Credit Default Swaps
Other Liabilities
Derivative Liabilities	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	359.5	104.1
Fair Value, Inputs, Level 1 [Member] | States, Municipalities, and Political Subdivisions
Fixed Maturity Securities
Fixed Maturity Securities	33.5	53.0
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	596.3	84.2
Fair Value, Inputs, Level 1 [Member] | Mortgage/Asset-backed Securities
Fixed Maturity Securities
Fixed Maturity Securities	15.5	0
Fair Value, Inputs, Level 1 [Member] | All Other Corporate Bonds
Fixed Maturity Securities
Fixed Maturity Securities	3,232.5	1,977.1
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	38,521.7	40,766.3
Other Long-term Investments
Derivative Assets	62.1	81.6
Equity Securities
Equity Securities	10.1	10.3
Other Liabilities
Derivative Liabilities	157.4	170.5
Fair Value, Inputs, Level 2 [Member] | Interest Rate Swaps
Other Long-term Investments
Derivative Assets	59.6	76.5
Other Liabilities
Derivative Liabilities	31.2	31.7
Fair Value, Inputs, Level 2 [Member] | Foreign Exchange Contracts
Other Long-term Investments
Derivative Assets	2.5	5.1
Other Liabilities
Derivative Liabilities	125.5	138.8
Fair Value, Inputs, Level 2 [Member] | Credit Default Swaps
Other Liabilities
Derivative Liabilities	0.7
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	975.6	1,244.7
Fair Value, Inputs, Level 2 [Member] | States, Municipalities, and Political Subdivisions
Fixed Maturity Securities
Fixed Maturity Securities	1,645.5	1,625.1
Fair Value, Inputs, Level 2 [Member] | Foreign Governments
Fixed Maturity Securities
Fixed Maturity Securities	1,375.2	1,424.9
Fair Value, Inputs, Level 2 [Member] | Public Utilities
Fixed Maturity Securities
Fixed Maturity Securities	10,090.4	10,485.6
Fair Value, Inputs, Level 2 [Member] | Mortgage/Asset-backed Securities
Fixed Maturity Securities
Fixed Maturity Securities	2,026.2	2,216.0
Fair Value, Inputs, Level 2 [Member] | All Other Corporate Bonds
Fixed Maturity Securities
Fixed Maturity Securities	22,394.3	23,755.5
Fair Value, Inputs, Level 2 [Member] | Redeemable Preferred Stocks
Fixed Maturity Securities
Fixed Maturity Securities	14.5	14.5
Fair Value, Inputs, Level 3 [Member]
Fixed Maturity Securities
Fixed Maturity Securities	1,677.5	1,988.3
Other Long-term Investments
Derivative Assets	0	0
Equity Securities
Equity Securities	4.3	4.3
Other Liabilities
Derivative Liabilities	77.5	83.9
Fair Value, Inputs, Level 3 [Member] | Interest Rate Swaps
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] | Credit Default Swaps
Other Liabilities
Derivative Liabilities	0
Fair Value, Inputs, Level 3 [Member] | Embedded Derivative in Modified Coinsurance Arrangement
Other Liabilities
Derivative Liabilities	77.5	83.9
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	174.8	128.7
Fair Value, Inputs, Level 3 [Member] | Foreign Governments
Fixed Maturity Securities
Fixed Maturity Securities	82.6	82.1
Fair Value, Inputs, Level 3 [Member] | Public Utilities
Fixed Maturity Securities
Fixed Maturity Securities	402.5	574.4
Fair Value, Inputs, Level 3 [Member] | Mortgage/Asset-backed Securities
Fixed Maturity Securities
Fixed Maturity Securities	0.5	0.5
Fair Value, Inputs, Level 3 [Member] | All Other Corporate Bonds
Fixed Maturity Securities
Fixed Maturity Securities	992.3	1,177.8
Fair Value, Inputs, Level 3 [Member] | Redeemable Preferred Stocks
Fixed Maturity Securities
Fixed Maturity Securities	$ 24.8	$ 24.8

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Transfers of Assets between Level 1 and Level 2 (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Fixed Maturity Securities
Level 1 from Level 2	$ 3,025.3	$ 3,869.0
Level 2 from Level 1	1,213.7	2,386.9
United States Government and Government Agencies and Authorities
Fixed Maturity Securities
Level 1 from Level 2	256.9	0
Level 2 from Level 1	0	204.2
States, Municipalities, and Political Subdivisions
Fixed Maturity Securities
Level 1 from Level 2	0	0
Level 2 from Level 1	19.4	43.8
Public Utilities
Fixed Maturity Securities
Level 1 from Level 2	502.1	826.2
Level 2 from Level 1	53.5	454.4
All Other Corporate Bonds
Fixed Maturity Securities
Level 1 from Level 2	2,266.3	3,042.8
Level 2 from Level 1	$ 1,140.8	$ 1,684.5

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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Parenthetical) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Balance at End of Period	$ 8,557.8	$ 8,179.9
Retained Earnings [Member]
Balance at End of Period	7,548.5	6,793.5
Dividends to Stockholders, per common share	$ 0.130	$ 0.105
Common Stock
Balance at End of Period	$ 36.0	$ 35.9

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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, 2013	Mar. 31, 2012
States, Municipalities, and Political Subdivisions
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning of Period	$ 128.7	$ 68.1
Investment Gain (Loss) included in Earnings	0	0
Investment Gain (Loss) included in OCI	2.7	(3.2)
Purchases	0	0
Sales	0	0
Level 3 Transfers Into	43.4	9.9
Level 3 Transfers Out of	0	(8.4)
End of Period	174.8	66.4
Foreign Governments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning of Period	82.1
Investment Gain (Loss) included in Earnings	0
Investment Gain (Loss) included in OCI	0.5
Purchases	0
Sales	0
Level 3 Transfers Into	0
Level 3 Transfers Out of	0
End of Period	82.6
Public Utilities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning of Period	574.4	338.9
Investment Gain (Loss) included in Earnings	0	0
Investment Gain (Loss) included in OCI	1.1	(0.1)
Purchases	0	0
Sales	(0.1)	(0.9)
Level 3 Transfers Into	252.3	416.9
Level 3 Transfers Out of	(425.2)	(206.5)
End of Period	402.5	548.3
Mortgage/Asset-backed Securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning of Period	0.5	31.7
Investment Gain (Loss) included in Earnings	0	0
Investment Gain (Loss) included in OCI	0	2.4
Purchases	0	0
Sales	0	0
Level 3 Transfers Into	0	0
Level 3 Transfers Out of	0	(12.8)
End of Period	0.5	21.3
All Other Corporate Bonds
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning of Period	1,177.8	665.5
Investment Gain (Loss) included in Earnings	0.8	0
Investment Gain (Loss) included in OCI	(8.8)	7.0
Purchases	30.3	12.0
Sales	(18.1)	(40.3)
Level 3 Transfers Into	382.4	223.0
Level 3 Transfers Out of	(572.1)	(134.0)
End of Period	992.3	733.2
Redeemable Preferred Stocks
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning of Period	24.8	37.2
Investment Gain (Loss) included in Earnings	0	(1.0)
Investment Gain (Loss) included in OCI	0	2.1
Purchases	0	0
Sales	0	(14.3)
Level 3 Transfers Into	0	6.3
Level 3 Transfers Out of	0	0
End of Period	24.8	30.3
Total Fixed Maturity Securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning of Period	1,988.3	1,141.4
Investment Gain (Loss) included in Earnings	0.8	(1.0)
Investment Gain (Loss) included in OCI	(4.5)	8.2
Purchases	30.3	12.0
Sales	(18.2)	(55.5)
Level 3 Transfers Into	678.1	656.1
Level 3 Transfers Out of	(997.3)	(361.7)
End of Period	1,677.5	1,399.5
Equity Securites
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning of Period	4.3	11.2
Investment Gain (Loss) included in Earnings	0	0
Investment Gain (Loss) included in OCI	0	0
Purchases	0	0
Sales	0	0
Level 3 Transfers Into	0	0
Level 3 Transfers Out of	0	(6.7)
End of Period	4.3	4.5
Embedded Derivative in Modified Coinsurance Arrangement
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning of Period	(83.9)	(135.7)
Investment Gain (Loss) included in Earnings	6.4	12.3
Investment Gain (Loss) included in OCI	0	0
Purchases	0	0
Sales	0	0
Level 3 Transfers Into	0	0
Level 3 Transfers Out of	0	0
End of Period	$ (77.5)	$ (123.4)

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Mortgage Loans, Sorted by Applicable Credit Quality Indicators, Internal rating (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans	$ 1,730.4	$ 1,712.7
Aa
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans	11.3	11.5
A
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans	660.8	659.4
Baa
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans	1,005.6	994.5
Ba
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans	39.6	34.2
B
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans	$ 13.1	$ 13.1

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Derivative Financial Instruments - Additional Information (Detail) (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Derivative [Line Items]
Current credit exposure on derivatives	$ 8,500,000
Cash collateral from counterparties	0		0
Carrying value of fixed maturity securities posted as collateral to our counterparties	92,400,000		108,600,000
Cash Collateral to counterparties	1,800,000		1,800,000
Aggregate fair value of all derivative instruments with credit risk-related contingent features in a liability position	157,400,000		170,500,000
Notional amount of forward starting interest rate swaps to hedge anticipated purchase of long-term bonds	110,000,000		150,000,000
Notional amount of foreign currency cash flow hedges	490,800,000		508,800,000
Gain on Cash Flow Hedge Ineffectiveness	0	0
Gain from Components Excluded from Assessment of Cash Flow Hedge Effectiveness	0	0
Approximate amount of net deferred gains on derivative instruments expected to be amortized during the next twelve months	43,200,000
Gain (Loss) from Components Excluded from Assessment of Fair Value Hedge Effectiveness, Net	0	0
Notional Amount Of Derivatives Additions	94,000,000	35,000,000
Fair Value Hedging [Member]
Derivative [Line Items]
Gain on Fair Value Hedge Ineffectiveness	0	0
Gain (Loss) from Hedged Firm Commitment Not Qualifying as Fair Value Hedge, Net	0	0
Receive Variable/Pay Fixed | Swaps
Derivative [Line Items]
Notional Amount of Interest Rate Fair Value Hedge Derivatives	174,000,000		174,000,000
Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments	2,400,000	1,700,000
Notional Amount Of Derivatives Additions	0	0
Receive Fixed/Pay Variable | Swaps
Derivative [Line Items]
Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments	4,100,000
Notional Amount of Fair Value Hedge Instruments	600,000,000		600,000,000
Notional Amount Of Derivatives Additions	0	0
Credit Default Swap [Member]
Derivative [Line Items]
Notional Amount Of Derivatives Additions	70,000,000
Credit Default Swap [Member] | Swaps
Derivative [Line Items]
Notional Amount Of Derivatives Additions	$ 70,000,000	$ 0

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CONSOLIDATED BALANCE SHEETS (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Investments
Fixed Maturity Securities - at fair value (amortized cost: $37,632.6; $37,751.5)	$ 44,436.5	$ 44,973.0
Mortgage Loans	1,730.4	1,712.7
Policy Loans	3,141.4	3,133.8
Other Long-term Investments	592.8	625.0
Short-term Investments	1,200.5	1,460.3
Total Investments	51,101.6	51,904.8
Other Assets
Cash and Bank Deposits	102.0	77.3
Accounts and Premiums Receivable	1,695.1	1,632.6
Reinsurance Recoverable	4,898.6	4,842.6
Accrued Investment Income	741.9	694.6
Deferred Acquisition Costs	1,753.1	1,755.5
Goodwill	200.9	201.7
Property and Equipment	499.0	501.6
Other Assets	619.2	625.4
Total Assets	61,611.4	62,236.1
Liabilities
Policy and Contract Benefits	1,509.3	1,484.6
Reserves for Future Policy and Contract Benefits	44,364.5	44,694.4
Unearned Premiums	477.9	426.7
Other Policyholders' Funds	1,635.8	1,644.9
Income Tax Payable	77.8	54.2
Deferred Income Tax	232.5	269.4
Short-term Debt	236.3	455.8
Long-term Debt	2,673.9	2,755.4
Other Liabilities	1,845.6	1,838.1
Total Liabilities	53,053.6	53,623.5
Commitments and Contingent Liabilities - Note 13
Stockholders' Equity
Common Stock, $0.10 par, Authorized: 725,000,000 shares Issued: 360,260,522 and 359,751,943 shares	36.0	36.0
Additional Paid-in Capital	2,613.4	2,607.7
Accumulated Other Comprehensive Income	485.7	628.0
Retained Earnings	7,548.5	7,371.6
Treasury Stock - at cost: 93,292,724 and 89,546,758 shares	(2,125.8)	(2,030.7)
Total Stockholders' Equity	8,557.8	8,612.6
Total Liabilities and Stockholders' Equity	$ 61,611.4	$ 62,236.1

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Investments Investment Income (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Investment Income, Interest and Dividend	$ 635.8	$ 634.8
Less Investment Expenses	7.1	7.2
Less Investment Income on PFA Assets	4.0	4.1
Less Amortization of Tax Credit Partnerships	3.6	4.0
Net Investment Income	621.1	619.5
Fixed Income Securities [Member]
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Investment Income, Interest and Dividend	589.9	595.5
Derivative [Member]
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Investment Income, Interest and Dividend	7.7	6.3
Mortgage Receivable [Member]
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Investment Income, Interest and Dividend	26.0	25.0
Policy Loans [Member]
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Investment Income, Interest and Dividend	3.7	3.6
Other Long-term Investments [Member]
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Investment Income, Interest and Dividend	7.7	3.2
Short-term Investments [Member]
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Investment Income, Interest and Dividend	$ 0.8	$ 1.2

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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Change in Net Unrealized Gain on Securities Before Adjustment, Tax (Benefit)	$ (159.4)	$ (110.5)
Change in Adjustment to Deferred Acquisition Costs and Reserves for Future Policy and Contract Benefits, Net of Reinsurance, Tax Expense	108.6	97.2
Change in Net Gain on Cash Flow Hedges, Tax (Benefit)	(0.2)	(5.9)
Change in Unrecognized Pension and Postretirement Benefit Costs, Tax Expense	$ 5.5	$ 3.5

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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, 2013	Mar. 31, 2012
Segment Reporting, Revenue Reconciling Item [Line Items]
Operating Revenue by Segment	$ 2,614.5	$ 2,598.9
Net Realized Investment Gain (Loss)	10.3	12.4
Revenue	2,624.8	2,611.3
Operating Income (Loss)	308.4	309.2
Net Realized Investment Gain (Loss)	10.3	12.4
Non-operating Retirement-related Loss	(14.9)	(11.6)
Income Tax Expense (Benefit)	(91.2)	(96.1)
Net Income	$ 212.6	$ 213.9

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Amortized Cost and Fair Values of Securities by Security Type (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	$ 37,632.6	$ 37,751.5
Gross Unrealized Gain	6,850.2	7,277.5
Gross Unrealized Loss	46.3	56.0
Fixed Maturity Securities	44,436.5	44,973.0
United States Government and Government Agencies and Authorities
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	1,027.3	1,020.9
Gross Unrealized Gain	309.2	329.0
Gross Unrealized Loss	1.4	1.1
Fixed Maturity Securities	1,335.1	1,348.8
States, Municipalities, and Political Subdivisions
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	1,550.8	1,498.4
Gross Unrealized Gain	308.5	316.2
Gross Unrealized Loss	5.5	7.8
Fixed Maturity Securities	1,853.8	1,806.8
Foreign Government Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	1,197.3	1,280.4
Gross Unrealized Gain	260.5	226.6
Gross Unrealized Loss	0	0
Fixed Maturity Securities	1,457.8	1,507.0
Public Utility, Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	9,316.7	9,294.3
Gross Unrealized Gain	1,782.4	1,865.0
Gross Unrealized Loss	9.9	15.1
Fixed Maturity Securities	11,089.2	11,144.2
Mortgage/Asset-backed Securities
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	1,767.1	1,927.9
Gross Unrealized Gain	275.6	289.1
Gross Unrealized Loss	0.5	0.5
Fixed Maturity Securities	2,042.2	2,216.5
All Other Corporate Bonds
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	22,740.4	22,696.6
Gross Unrealized Gain	3,907.7	4,245.3
Gross Unrealized Loss	29.0	31.5
Fixed Maturity Securities	26,619.1	26,910.4
Redeemable Preferred Stocks
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	33.0	33.0
Gross Unrealized Gain	6.3	6.3
Gross Unrealized Loss	0	0
Fixed Maturity Securities	$ 39.3	$ 39.3

XML

Commitments and Contingent Liabilities - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2010	Sep. 30, 2011	Mar. 31, 2011
Commitments and Contingencies Disclosure [Line Items]
Interest on undrawn retained asset account funds	18.00%
States involved in unclaimed property examination			32
Insurers requested to cross-check benefits		160

XML

Fair Values of Financial Instruments (Tables)

3 Months Ended

Mar. 31, 2013

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.

	March 31, 2013				December 31, 2012
	Carrying Amount		Fair Value		Carrying Amount		Fair Value
	(in millions of dollars)
Assets
Fixed Maturity Securities	$	44,436.5	$	44,436.5	$	44,973.0	$	44,973.0
Mortgage Loans	1,730.4		1,959.8		1,712.7		1,937.1
Policy Loans	3,141.4		3,219.7		3,133.8		3,215.3
Other Long-term Investments
Derivatives	62.1		62.1		81.6		81.6
Equity Securities	14.4		14.4		14.6		14.6
Miscellaneous Long-term Investments	438.4		438.4		455.1		455.1
Liabilities
Policyholders' Funds
Deferred Annuity Products	$	637.5	$	637.5	$	640.1	$	640.1
Supplementary Contracts without Life Contingencies	548.3		548.3		535.5		535.5
Long-term Debt	2,673.9		2,954.9		2,755.4		2,968.8
Other Liabilities
Derivatives	157.4		157.4		170.5		170.5
Embedded Derivative in Modified Coinsurance Arrangement	77.5		77.5		83.9		83.9
Unfunded Commitments to Investment Partnerships	75.7		75.7		83.7		83.7

Fair Value, Measurement Inputs, Disclosure

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

	March 31, 2013
	Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
	(in millions of dollars)
Assets
Fixed Maturity Securities
United States Government and Government Agencies and Authorities	$	359.5	$	975.6	$	—	$	1,335.1
States, Municipalities, and Political Subdivisions	33.5		1,645.5		174.8		1,853.8
Foreign Governments	—		1,375.2		82.6		1,457.8
Public Utilities	596.3		10,090.4		402.5		11,089.2
Mortgage/Asset-Backed Securities	15.5		2,026.2		0.5		2,042.2
All Other Corporate Bonds	3,232.5		22,394.3		992.3		26,619.1
Redeemable Preferred Stocks	—		14.5		24.8		39.3
Total Fixed Maturity Securities	4,237.3		38,521.7		1,677.5		44,436.5
Other Long-term Investments
Derivatives
Interest Rate Swaps	—		59.6		—		59.6
Foreign Exchange Contracts	—		2.5		—		2.5
Total Derivatives	—		62.1		—		62.1
Equity Securities	—		10.1		4.3		14.4
Liabilities
Other Liabilities
Derivatives
Interest Rate Swaps	$	—	$	31.2	$	—	$	31.2
Foreign Exchange Contracts	—		125.5		—		125.5
Credit Default Swaps	—		0.7		—		0.7
Embedded Derivative in Modified Coinsurance Arrangement	—		—		77.5		77.5
Total Derivatives	—		157.4		77.5		234.9

	December 31, 2012
	Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
	(in millions of dollars)
Assets
Fixed Maturity Securities
United States Government and Government Agencies and Authorities	$	104.1	$	1,244.7	$	—	$	1,348.8
States, Municipalities, and Political Subdivisions	53.0		1,625.1		128.7		1,806.8
Foreign Governments	—		1,424.9		82.1		1,507.0
Public Utilities	84.2		10,485.6		574.4		11,144.2
Mortgage/Asset-Backed Securities	—		2,216.0		0.5		2,216.5
All Other Corporate Bonds	1,977.1		23,755.5		1,177.8		26,910.4
Redeemable Preferred Stocks	—		14.5		24.8		39.3
Total Fixed Maturity Securities	2,218.4		40,766.3		1,988.3		44,973.0
Other Long-term Investments
Derivatives
Interest Rate Swaps	—		76.5		—		76.5
Foreign Exchange Contracts	—		5.1		—		5.1
Total Derivatives	—		81.6		—		81.6
Equity Securities	—		10.3		4.3		14.6
Liabilities
Other Liabilities
Derivatives
Interest Rate Swaps	$	—	$	31.7	$	—	$	31.7
Foreign Exchange Contracts	—		138.8		—		138.8
Embedded Derivative in Modified Coinsurance Arrangement	—		—		83.9		83.9
Total Derivatives	—		170.5		83.9		254.4

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, 2013				March 31, 2012
	Transfers into
	Level 1 from Level 2		Level 2 from Level 1		Level 1 from Level 2		Level 2 from Level 1
	(in millions of dollars)
Fixed Maturity Securities
United States Government and Government Agencies and Authorities	$	256.9	$	—	$	—	$	204.2
States, Municipalities, and Political Subdivisions	—		19.4		—		43.8
Public Utilities	502.1		53.5		826.2		454.4
All Other Corporate Bonds	2,266.3		1,140.8		3,042.8		1,684.5
Total Fixed Maturity Securities	$	3,025.3	$	1,213.7	$	3,869.0	$	2,386.9

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, 2013
				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
	(in millions of dollars)
Fixed Maturity Securities
States, Municipalities, and Political Subdivisions	$	128.7		$	—		$	2.7		$	—	$	—		$	43.4	$	—		$	174.8
Foreign Governments	82.1			—			0.5			—		—			—		—			82.6
Public Utilities	574.4			—			1.1			—		(0.1		)	252.3		(425.2		)	402.5
Mortgage/Asset-Backed Securities	0.5			—			—			—		—			—		—			0.5
All Other Corporate Bonds	1,177.8			0.8			(8.8		)	30.3		(18.1		)	382.4		(572.1		)	992.3
Redeemable Preferred Stocks	24.8			—			—			—		—			—		—			24.8
Total Fixed Maturity Securities	1,988.3			0.8			(4.5		)	30.3		(18.2		)	678.1		(997.3		)	1,677.5
Equity Securities	4.3			—			—			—		—			—		—			4.3
Embedded Derivative in Modified Coinsurance Arrangement	(83.9		)	6.4			—			—		—			—		—			(77.5		)
	Three Months Ended March 31, 2012
				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
	(in millions of dollars)
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		)

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, 2013 and 2012 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 $6.4 million and $12.3 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 and losses.

Fair Value Inputs, Assets, Quantitative Information [Table Text Block]

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, 2013
	Fair Value			Unobservable Input		Range/Weighted Average
	(in millions of dollars)
Fixed Maturity Securities
States, Municipalities, and Political Subdivisions - Private	$	126.5		- Comparability Adjustment	(b)	0.25% - 1.25% / 0.74%
Public Utilities	89.2			- Comparability Adjustment - Volatility of Credit	(b) (e)	0.25% - 0.30% / 0.27% 0.25% - 0.25% / 0.25%
Mortgage/Asset-Backed Securities - Private	0.5			- Discount for Size	(c)	5.76% - 5.86% / 5.84%
All Other Corporate Bonds - Private	237.5			- Change in Benchmark Reference - Comparability Adjustment - Discount for Size - Lack of Marketability - Volatility of Credit - Market Convention	(a) (b) (c) (d) (e) (f)	0.75% - 3.20% / 1.07% (0.54)% - (0.08)% / (0.37)% 0.50% - 0.50% / 0.50% 0.50% - 1.00% / 0.76% 0.50% - 7.72% / 1.60% Priced at Par
All Other Corporate Bonds - Public	328.4			- Change in Benchmark Reference - Comparability Adjustment - Discount for Size - Lack of Marketability - Volatility of Credit	(a) (b) (c) (d) (e)	(0.88)% - (0.88)% / (0.88)% (0.30)% - 1.00% / 0.10% (0.57)% - (0.57)% / (0.57)% 0.05% - 0.20% / 0.13% (0.30)% - 0.30% / 0.10%
Equity Securities - Private	4.0			- Market Convention	(f)	Priced at Cost or Owner's Equity
Embedded Derivative in Modified Coinsurance Arrangement	(77.5		)	- Projected Liability Cash Flows	(g)	Actuarial Assumptions

	December 31, 2012
	Fair Value			Unobservable Input		Range/Weighted Average
	(in millions of dollars)
Fixed Maturity Securities
States, Municipalities, and Political Subdivisions - Private	$	42.7		- Comparability Adjustment - Lack of Marketability - Volatility of Credit	(b) (d) (e)	0.25% - 0.25% / 0.25% 0.25% - 0.25% / 0.25% 0.15% - 0.15% / 0.15%
Public Utilities	17.4			- Comparability Adjustment	(b)	0.20% - 0.20% / 0.20%
Mortgage/Asset-Backed Securities - Private	0.5			- Discount for Size	(c)	5.74% - 5.84% / 5.81%
All Other Corporate Bonds - Private	391.8			- Change in Benchmark Reference - Comparability Adjustment - Discount for Size - Lack of Marketability - Volatility of Credit - Market Convention	(a) (b) (c) (d) (e) (f)	0.04% - 2.89% / 0.28% 1.48% - 1.48% / 1.48% 0.10% - 0.50% / 0.24% 0.10% - 1.00% / 0.46% (0.25)% -7.72% / 1.51% Priced at Par
All Other Corporate Bonds - Public	165.0			- Change in Benchmark Reference - Comparability Adjustment - Discount for Size - Lack of Marketability - Volatility of Credit - Market Convention	(a) (b) (c) (d) (e) (f)	0.25% - 0.25% / 0.25% (0.59)% - 1.00% / 0.27% 0.25% - 0.25% / 0.25% 0.20% - 0.30% / 0.24% (0.30)% - (0.30)% / (0.30)% Priced at Par
Equity Securities - Private	4.0			- Market Convention	(f)	Priced at Cost or Owner's Equity
Embedded Derivative in Modified Coinsurance Arrangement	(83.9		)	- Projected Liability Cash Flows	(g)	Actuarial Assumptions

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

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

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

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

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

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

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

XML

Length of Time Fixed Maturity Securities had been in a Gross Unrealized Loss Position (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	$ 1,161.3	$ 586.8
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	20.8	11.8
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	436.5	596.8
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	25.5	44.2
US Government and Government Agencies and Authorities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	0	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	0	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	6.2	6.5
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	1.4	1.1
US States and Political Subdivisions Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	91.0	30.8
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	1.8	0.9
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	45.3	42.1
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	3.7	6.9
Public Utility, Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	224.4	110.3
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	4.1	3.9
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	57.4	147.6
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	5.8	11.2
Asset-backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	2.5	4.4
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	0	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	3.8	3.8
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	0.5	0.5
All Other Corporate Bonds
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	843.4	441.3
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	14.9	7.0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	323.8	396.8
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	$ 14.1	$ 24.5

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Derivative Financial Instruments (Tables)

3 Months Ended

Mar. 31, 2013

Notes to Financial Statements [Abstract]

Schedule of Derivative Instruments [Table Text Block]

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		Credit Default		Forwards		Total
	(in millions of dollars)
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
Balance at December 31, 2012	$	174.0	$	508.8	$	750.0	$	—	$	—	$	1,432.8
Additions	—		—		—		70.0		24.0		94.0
Terminations	—		18.0		40.0		—		24.0		82.0
Balance at March 31, 2013	$	174.0	$	490.8	$	710.0	$	70.0	$	—	$	1,444.8

Schedule of Interest Rate Derivatives [Table Text Block]

The following table summarizes the timing of anticipated settlements of interest rate swaps outstanding under our cash flow hedging programs at March 31, 2013, whereby we receive a fixed rate and pay a variable rate. The weighted average variable interest rates assume current market conditions.

	2013
	(in millions of dollars)
Notional Value	$	110.0
Weighted Average Receive Rate	6.71		%
Weighted Average Pay Rate	0.28		%

Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block]

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

	March 31, 2013
	Asset Derivatives			Liability Derivatives
	Balance Sheet Location	Fair Value		Balance Sheet Location	Fair Value
	(in millions of dollars)
Designated as Hedging Instruments
Interest Rate Swaps	Other L-T Investments	$	59.6	Other Liabilities	$	31.2
Foreign Exchange Contracts	Other L-T Investments	2.5		Other Liabilities	125.5
Total		$	62.1		$	156.7
Not Designated as Hedging Instruments
Credit Default Swaps				Other Liabilities	$	0.7
Embedded Derivative in Modified Coinsurance Arrangement				Other Liabilities	77.5
Total					$	78.2

	December 31, 2012
	Asset Derivatives			Liability Derivatives
	Balance Sheet Location	Fair Value		Balance Sheet Location	Fair Value
	(in millions of dollars)
Designated as Hedging Instruments
Interest Rate Swaps	Other L-T Investments	$	76.5	Other Liabilities	$	31.7
Foreign Exchange Contracts	Other L-T Investments	5.1		Other Liabilities	138.8
Total		$	81.6		$	170.5
Not Designated as Hedging Instruments
Embedded Derivative in Modified Coinsurance Arrangement				Other Liabilities	$	83.9

Schedule of Derivative Instruments, Gain (Loss) in Statement of Financial Performance [Table Text Block]

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, 2013
	Gain Recognized in OCI on Derivatives (Effective Portion)			Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)
	(in millions of dollars)
Interest Rate Swaps and Forwards	$	(2.2	)	$	10.0		(1)
Interest Rate Swaps	—			(0.4		)	(3)
Foreign Exchange Contracts	—			(1.7		)	(1)
Foreign Exchange Contracts	4.1			(6.7		)	(2)
Total	$	1.9		$	1.2

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

(2) Loss recognized in net realized investment gain

(3) Loss recognized in interest and debt expense

	Three Months Ended March 31, 2012
	Gain Recognized in OCI on Derivatives (Effective Portion)			Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)
	(in millions of dollars)
Interest Rate Swaps and Forwards	$	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

Derivative Instruments and Hedging Activities Disclosure [Text Block]

Derivative Financial Instruments

Purpose of Derivatives

We are exposed to certain risks relating to our ongoing business operations. The primary risks managed by using derivative instruments are interest rate risk, risk related to matching duration for our assets and liabilities, foreign currency risk, and credit 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, forward contracts on specific fixed income securities, and credit default swaps. Transactions hedging interest rate risk are primarily associated with our individual and group long-term care and individual and group disability products. All other product portfolios are periodically reviewed to determine if hedging strategies would be appropriate for risk management purposes.

Derivatives designated as cash flow hedges and used to reduce our exposure to interest rate and duration risk 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. We use interest rate swaps to hedge the anticipated purchase of fixed maturity securities thereby protecting us from the potential adverse impact of declining interest rates on the associated policy reserves. We also use interest rate swaps to hedge the potential adverse impact of rising interest rates in anticipation of issuing fixed rate long-term debt.

• 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.

Derivatives designated as fair value hedges and used to reduce our exposure to interest rate and duration risk 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.

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

• 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.

• Foreign currency forward contracts are used to minimize foreign currency risks. A foreign currency forward is a derivative without an initial investment where we and the counterparty agree to exchange a specific amount of currencies, at a specific exchange rate, on a specific date. We have used these forward contracts to hedge the foreign currency risk associated with certain of the debt repayments of the U.S. dollar-denominated debt issued by one of our U.K. subsidiaries and to hedge the currency risk of certain foreign currency-denominated fixed maturity securities owned for diversification purposes.

Derivatives not designated as hedging instruments and used to reduce our exposure to credit losses on securities owned are as follows:

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

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 $8.5 million at March 31, 2013. We held no cash collateral from our counterparties as of March 31, 2013 and December 31, 2012. 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 $92.4 million and $108.6 million at March 31, 2013 and December 31, 2012, respectively. We had $1.8 million cash posted as collateral to our counterparties at March 31, 2013 and December 31, 2012.

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 $157.4 million and $170.5 million at March 31, 2013 and December 31, 2012, respectively.

Derivative Transactions

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		Credit Default		Forwards		Total
	(in millions of dollars)
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
Balance at December 31, 2012	$	174.0	$	508.8	$	750.0	$	—	$	—	$	1,432.8
Additions	—		—		—		70.0		24.0		94.0
Terminations	—		18.0		40.0		—		24.0		82.0
Balance at March 31, 2013	$	174.0	$	490.8	$	710.0	$	70.0	$	—	$	1,444.8

The following table summarizes the timing of anticipated settlements of interest rate swaps outstanding under our cash flow hedging programs at March 31, 2013, whereby we receive a fixed rate and pay a variable rate. The weighted average variable interest rates assume current market conditions.

	2013
	(in millions of dollars)
Notional Value	$	110.0
Weighted Average Receive Rate	6.71		%
Weighted Average Pay Rate	0.28		%

Cash Flow Hedges

As of March 31, 2013 and December 31, 2012, we had $110.0 million and $150.0 million, respectively, notional amount of forward starting interest rate swaps to hedge the anticipated purchase of fixed maturity securities and $490.8 million and $508.8 million, respectively, notional amount of open current and forward foreign currency swaps to hedge fixed income foreign currency-denominated securities.

For the three months ended March 31, 2013 and 2012, 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, 2013, we expect to amortize approximately $43.2 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, 2013. Fluctuations in fair values of these derivatives between March 31, 2013 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, 2013, we are hedging the variability of future cash flows associated with forecasted transactions through the year 2038.

Fair Value Hedges

As of March 31, 2013 and December 31, 2012, 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 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, 2013 and 2012, the change in fair value of the hedged fixed maturity securities attributable to the hedged benchmark interest rate resulted in a loss of $2.4 million and $1.7 million, respectively, with an offsetting gain on the related interest rate swaps.

As of March 31, 2013 and December 31, 2012, we had $600.0 million notional amount of receive fixed, pay variable interest rate swaps to hedge the changes in the fair value of certain fixed rate long-term debt. These swaps effectively convert the associated fixed rate long-term debt into floating rate debt and provide 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, 2013, the change in fair value of the hedged debt attributable to the hedged benchmark interest rate resulted in a gain of $4.1 million with an offsetting loss on the related interest rate swaps. 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 gain on the related interest rate swaps.

For the three months ended March 31, 2013 and 2012, 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

During the three months ended March 31, 2013, we purchased $70.0 million notional amount of single-name credit default swaps. We entered into these swaps in order to mitigate the credit risk associated with specific securities owned. Changes in the fair value of the derivative, together with the payment of periodic fees, are recognized in earnings as a component of net realized investment gain or loss during the period of change in fair value.

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. Changes in the fair value of the embedded derivative are recognized in earnings as a component of net realized investment gain or loss during the period of change in fair value.

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, 2013
	Asset Derivatives			Liability Derivatives
	Balance Sheet Location	Fair Value		Balance Sheet Location	Fair Value
	(in millions of dollars)
Designated as Hedging Instruments
Interest Rate Swaps	Other L-T Investments	$	59.6	Other Liabilities	$	31.2
Foreign Exchange Contracts	Other L-T Investments	2.5		Other Liabilities	125.5
Total		$	62.1		$	156.7
Not Designated as Hedging Instruments
Credit Default Swaps				Other Liabilities	$	0.7
Embedded Derivative in Modified Coinsurance Arrangement				Other Liabilities	77.5
Total					$	78.2

	December 31, 2012
	Asset Derivatives			Liability Derivatives
	Balance Sheet Location	Fair Value		Balance Sheet Location	Fair Value
	(in millions of dollars)
Designated as Hedging Instruments
Interest Rate Swaps	Other L-T Investments	$	76.5	Other Liabilities	$	31.7
Foreign Exchange Contracts	Other L-T Investments	5.1		Other Liabilities	138.8
Total		$	81.6		$	170.5
Not Designated as Hedging Instruments
Embedded Derivative in Modified Coinsurance Arrangement				Other Liabilities	$	83.9

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, 2013
	Gain Recognized in OCI on Derivatives (Effective Portion)			Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)
	(in millions of dollars)
Interest Rate Swaps and Forwards	$	(2.2	)	$	10.0		(1)
Interest Rate Swaps	—			(0.4		)	(3)
Foreign Exchange Contracts	—			(1.7		)	(1)
Foreign Exchange Contracts	4.1			(6.7		)	(2)
Total	$	1.9		$	1.2

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

(2) Loss recognized in net realized investment gain

(3) Loss recognized in interest and debt expense

	Three Months Ended March 31, 2012
	Gain Recognized in OCI on Derivatives (Effective Portion)			Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)
	(in millions of dollars)
Interest Rate Swaps and Forwards	$	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

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

	Three Months Ended March 31
	2013			2012
	(in millions of dollars)
Credit Default Swaps	$	(0.3	)	$	—
Embedded Derivative in Modified Coinsurance Arrangement	6.4			12.3
Gain Recognized in Net Realized Investment Gain	$	6.1		$	12.3

Location of and Gain (Loss) on Derivatives Not Designated as Hedging Instruments [Table Text Block]

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

	Three Months Ended March 31
	2013			2012
	(in millions of dollars)
Credit Default Swaps	$	(0.3	)	$	—
Embedded Derivative in Modified Coinsurance Arrangement	6.4			12.3
Gain Recognized in Net Realized Investment Gain	$	6.1		$	12.3

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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (USD $) In Millions	Total	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Income (Loss) [Member]	Retained Earnings [Member]	Treasury Stock
Balance at Beginning of Year at Dec. 31, 2011		$ 35.9	$ 2,591.1	$ 461.8	$ 6,611.0	$ (1,530.1)
Common Stock Activity			9.3
Other Comprehensive Income (Loss), Net of Tax	(6.4)			(6.4)
Net Income	213.9				213.9
Dividends to Stockholders (per common share: $0.130; $0.105)					(31.4)
Purchases of Treasury Stock						(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)
Balance at Beginning of Year at Dec. 31, 2012	8,612.6	36.0	2,607.7	628.0	7,371.6	(2,030.7)
Common Stock Activity			5.7
Other Comprehensive Income (Loss), Net of Tax	(142.3)			(142.3)
Net Income	212.6				212.6
Dividends to Stockholders (per common share: $0.130; $0.105)					(35.7)
Purchases of Treasury Stock						(95.1)
Balance at End of Period at Mar. 31, 2013	$ 8,557.8	$ 36.0	$ 2,613.4	$ 485.7	$ 7,548.5	$ (2,125.8)

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CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Millions, except Share data, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Investments [Abstract]
Fixed Maturity Securities, Amortized Cost	$ 37,632.6	$ 37,751.5
Stockholders' Equity
Common Stock, Par	$ 0.10	$ 0.10
Common Stock, Authorized	725,000,000	725,000,000
Common Stock, Issued	360,260,522	359,751,943
Treasury Stock, Shares	93,292,724	89,546,758

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Pensions and Other Postretirement Benefits

3 Months Ended

Mar. 31, 2013

Notes to Financial Statements [Abstract]

Pension and Other Postretirement Benefits Disclosure [Text Block]

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

	Three Months Ended March 31
	Pension Benefits
	U.S. Plans						Non U.S. Plans						OPEB
	2013			2012			2013			2012			2013			2012
	(in millions of dollars)
Service Cost	$	14.9		$	12.2		$	1.1		$	1.2		$	0.2		$	0.4
Interest Cost	21.9			21.1			2.1			2.1			2.0			2.4
Expected Return on Plan Assets	(25.5		)	(22.2		)	(3.0		)	(2.7		)	(0.2		)	(0.2		)
Amortization of:
Net Actuarial Loss	14.6			11.5			0.3			0.1			—			—
Prior Service Credit	—			(0.1		)	—			—			(1.2		)	(0.6		)
Total	$	25.9		$	22.5		$	0.5		$	0.7		$	0.8		$	2.0

We have no regulatory contribution requirements for our U.S. qualified defined benefit plan in 2013, and no voluntary contributions were made to the U.S. qualified defined benefit plan during the three months ended March 31, 2013. For our U.K. operation, which maintains a separate defined benefit plan, we made required contributions of $1.0 million, or approximately £0.6 million, during the three months ended March 31, 2013.

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Document and Entity Information	3 Months Ended
	Mar. 31, 2013	Apr. 29, 2013
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2013
Document Fiscal Year Focus	2013
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		266,927,641

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Stockholders' Equity and Earnings Per Common Share

3 Months Ended

Mar. 31, 2013

Disclosure Text Block [Abstract]

Stockholders' Equity and Earnings Per Common Share

Net income per common share is determined as follows:

	Three Months Ended March 31
	2013		2012
	(in millions of dollars, except share data)
Numerator
Net Income	$	212.6	$	213.9
Denominator (000s)
Weighted Average Common Shares - Basic	269,361.1		290,429.5
Dilution for Assumed Exercises of Stock Options and Nonvested Stock Awards	993.3		854.5
Weighted Average Common Shares - Assuming Dilution	270,354.4		291,284.0
Net Income Per Common Share
Basic	$	0.79	$	0.74
Assuming Dilution	$	0.79	$	0.73

We use the treasury stock method to account for the effect of outstanding stock options and nonvested stock awards 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 and/or the grant price of the nonvested stock awards.

The outstanding stock options have exercise prices ranging from $11.37 to $26.29, and the nonvested stock awards have grant prices ranging from $19.38 to $26.31.

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 0.4 million and 2.2 million shares of common stock for the three month periods ended March 31, 2013 and 2012, respectively.

In July 2012 and February 2011, our board of directors authorized the repurchase of up to $750.0 million and $1.0 billion, respectively, of Unum Group's common stock. At December 31, 2012, no amounts were remaining for the purchase of shares under the February 2011 repurchase program. The July 2012 share repurchase program has an expiration date of January 2014, and the dollar value of shares remaining under the repurchase program was $454.9 million at March 31, 2013.

For the three month periods ended March 31, 2013 and 2012 and for the year ended December 31, 2012, we repurchased 3.7 million, 7.5 million, and 23.6 million shares, respectively. Common stock repurchases are 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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CONSOLIDATED STATEMENTS OF INCOME (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Revenue
Premium Income	$ 1,930.9	$ 1,921.9
Net Investment Income	621.1	619.5
Realized Investment Gain (Loss)
Total Other-Than-Temporary Impairment Loss on Fixed Maturity Securities	(0.8)	0
Other Net Realized Investment Gain	11.1	12.4
Net Realized Investment Gain (Loss)	10.3	12.4
Other Income	62.5	57.5
Total Revenue	2,624.8	2,611.3
Benefits and Expenses
Benefits and Change in Reserves for Future Benefits	1,648.5	1,662.9
Commissions	238.2	232.3
Interest and Debt Expense	37.1	35.5
Deferral of Acquisition Costs	(118.2)	(117.4)
Amortization of Deferred Acquisition Costs	123.8	99.4
Compensation Expense	197.6	206.9
Other Expenses	194.0	181.7
Total Benefits and Expenses	2,321.0	2,301.3
Income Before Income Tax	303.8	310.0
Income Tax (Benefit)
Current	81.8	37.3
Deferred	9.4	58.8
Total Income Tax	91.2	96.1
Net Income	$ 212.6	$ 213.9
Net Income Per Common Share
Basic	$ 0.79	$ 0.74
Diluted	$ 0.79	$ 0.73

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Fair Values of Financial Instruments

3 Months Ended

Mar. 31, 2013

Notes to Financial Statements [Abstract]

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.

	March 31, 2013				December 31, 2012
	Carrying Amount		Fair Value		Carrying Amount		Fair Value
	(in millions of dollars)
Assets
Fixed Maturity Securities	$	44,436.5	$	44,436.5	$	44,973.0	$	44,973.0
Mortgage Loans	1,730.4		1,959.8		1,712.7		1,937.1
Policy Loans	3,141.4		3,219.7		3,133.8		3,215.3
Other Long-term Investments
Derivatives	62.1		62.1		81.6		81.6
Equity Securities	14.4		14.4		14.6		14.6
Miscellaneous Long-term Investments	438.4		438.4		455.1		455.1
Liabilities
Policyholders' Funds
Deferred Annuity Products	$	637.5	$	637.5	$	640.1	$	640.1
Supplementary Contracts without Life Contingencies	548.3		548.3		535.5		535.5
Long-term Debt	2,673.9		2,954.9		2,755.4		2,968.8
Other Liabilities
Derivatives	157.4		157.4		170.5		170.5
Embedded Derivative in Modified Coinsurance Arrangement	77.5		77.5		83.9		83.9
Unfunded Commitments to Investment Partnerships	75.7		75.7		83.7		83.7

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 $2,919.8 million and $2,912.7 million as of March 31, 2013 and December 31, 2012, 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 fair values of $1,241.2 million and $1,212.0 million as of March 31, 2013 and December 31, 2012, respectively, 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 fair values of $1,713.7 million and $1,756.8 million as of March 31, 2013 and December 31, 2012, respectively, and are assigned a Level 2.

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

Fair Value Measurements for Financial Instruments Carried at Fair Value

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

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 2013, we have applied valuation techniques on a consistent basis to similar assets and liabilities and consistent with those techniques used at year end 2012.

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

The management of our investment portfolio includes establishing pricing policy and reviewing the reasonableness of sources and inputs used in developing pricing. We review all prices 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, 2013, approximately 9.5 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.

The remaining 90.5 percent of our fixed maturity securities were valued based on non-binding quotes or other observable and unobservable inputs, as discussed below.

• Approximately 73.4 percent of our fixed maturity securities were valued based on prices from pricing services that generally use observable inputs such as prices for securities or comparable securities in active markets in their valuation techniques. These assets were classified as Level 2.  Level 2 assets or liabilities are those valued using inputs (other than prices included in Level 1) that are either directly or indirectly observable for the asset or liability through correlation with market data at the measurement date and for the duration of the instrument's anticipated life.

• Approximately 3.4 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 13.7 percent of our fixed maturity securities were valued based on prices of comparable securities, matrix pricing, market models, and/or internal models or were valued based on non-binding quotes with no other observable market data. These assets were classified as either Level 2 or Level 3, with the categorization dependent on whether there was other observable market data.  Level 3 is the lowest category of the fair value hierarchy and reflects the judgment of management regarding what market participants would use in pricing assets or liabilities at the measurement date. Financial assets and liabilities categorized as Level 3 are generally those that are valued using unobservable inputs to extrapolate an estimated fair value.

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

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

	March 31, 2013
	Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
	(in millions of dollars)
Assets
Fixed Maturity Securities
United States Government and Government Agencies and Authorities	$	359.5	$	975.6	$	—	$	1,335.1
States, Municipalities, and Political Subdivisions	33.5		1,645.5		174.8		1,853.8
Foreign Governments	—		1,375.2		82.6		1,457.8
Public Utilities	596.3		10,090.4		402.5		11,089.2
Mortgage/Asset-Backed Securities	15.5		2,026.2		0.5		2,042.2
All Other Corporate Bonds	3,232.5		22,394.3		992.3		26,619.1
Redeemable Preferred Stocks	—		14.5		24.8		39.3
Total Fixed Maturity Securities	4,237.3		38,521.7		1,677.5		44,436.5
Other Long-term Investments
Derivatives
Interest Rate Swaps	—		59.6		—		59.6
Foreign Exchange Contracts	—		2.5		—		2.5
Total Derivatives	—		62.1		—		62.1
Equity Securities	—		10.1		4.3		14.4
Liabilities
Other Liabilities
Derivatives
Interest Rate Swaps	$	—	$	31.2	$	—	$	31.2
Foreign Exchange Contracts	—		125.5		—		125.5
Credit Default Swaps	—		0.7		—		0.7
Embedded Derivative in Modified Coinsurance Arrangement	—		—		77.5		77.5
Total Derivatives	—		157.4		77.5		234.9

	December 31, 2012
	Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
	(in millions of dollars)
Assets
Fixed Maturity Securities
United States Government and Government Agencies and Authorities	$	104.1	$	1,244.7	$	—	$	1,348.8
States, Municipalities, and Political Subdivisions	53.0		1,625.1		128.7		1,806.8
Foreign Governments	—		1,424.9		82.1		1,507.0
Public Utilities	84.2		10,485.6		574.4		11,144.2
Mortgage/Asset-Backed Securities	—		2,216.0		0.5		2,216.5
All Other Corporate Bonds	1,977.1		23,755.5		1,177.8		26,910.4
Redeemable Preferred Stocks	—		14.5		24.8		39.3
Total Fixed Maturity Securities	2,218.4		40,766.3		1,988.3		44,973.0
Other Long-term Investments
Derivatives
Interest Rate Swaps	—		76.5		—		76.5
Foreign Exchange Contracts	—		5.1		—		5.1
Total Derivatives	—		81.6		—		81.6
Equity Securities	—		10.3		4.3		14.6
Liabilities
Other Liabilities
Derivatives
Interest Rate Swaps	$	—	$	31.7	$	—	$	31.7
Foreign Exchange Contracts	—		138.8		—		138.8
Embedded Derivative in Modified Coinsurance Arrangement	—		—		83.9		83.9
Total Derivatives	—		170.5		83.9		254.4

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

	Three Months Ended
	March 31, 2013				March 31, 2012
	Transfers into
	Level 1 from Level 2		Level 2 from Level 1		Level 1 from Level 2		Level 2 from Level 1
	(in millions of dollars)
Fixed Maturity Securities
United States Government and Government Agencies and Authorities	$	256.9	$	—	$	—	$	204.2
States, Municipalities, and Political Subdivisions	—		19.4		—		43.8
Public Utilities	502.1		53.5		826.2		454.4
All Other Corporate Bonds	2,266.3		1,140.8		3,042.8		1,684.5
Total Fixed Maturity Securities	$	3,025.3	$	1,213.7	$	3,869.0	$	2,386.9

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) are as follows:

	Three Months Ended March 31, 2013
				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
	(in millions of dollars)
Fixed Maturity Securities
States, Municipalities, and Political Subdivisions	$	128.7		$	—		$	2.7		$	—	$	—		$	43.4	$	—		$	174.8
Foreign Governments	82.1			—			0.5			—		—			—		—			82.6
Public Utilities	574.4			—			1.1			—		(0.1		)	252.3		(425.2		)	402.5
Mortgage/Asset-Backed Securities	0.5			—			—			—		—			—		—			0.5
All Other Corporate Bonds	1,177.8			0.8			(8.8		)	30.3		(18.1		)	382.4		(572.1		)	992.3
Redeemable Preferred Stocks	24.8			—			—			—		—			—		—			24.8
Total Fixed Maturity Securities	1,988.3			0.8			(4.5		)	30.3		(18.2		)	678.1		(997.3		)	1,677.5
Equity Securities	4.3			—			—			—		—			—		—			4.3
Embedded Derivative in Modified Coinsurance Arrangement	(83.9		)	6.4			—			—		—			—		—			(77.5		)
	Three Months Ended March 31, 2012
				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
	(in millions of dollars)
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		)

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, 2013 and 2012 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 $6.4 million and $12.3 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 and losses.

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

	March 31, 2013
	Fair Value			Unobservable Input		Range/Weighted Average
	(in millions of dollars)
Fixed Maturity Securities
States, Municipalities, and Political Subdivisions - Private	$	126.5		- Comparability Adjustment	(b)	0.25% - 1.25% / 0.74%
Public Utilities	89.2			- Comparability Adjustment - Volatility of Credit	(b) (e)	0.25% - 0.30% / 0.27% 0.25% - 0.25% / 0.25%
Mortgage/Asset-Backed Securities - Private	0.5			- Discount for Size	(c)	5.76% - 5.86% / 5.84%
All Other Corporate Bonds - Private	237.5			- Change in Benchmark Reference - Comparability Adjustment - Discount for Size - Lack of Marketability - Volatility of Credit - Market Convention	(a) (b) (c) (d) (e) (f)	0.75% - 3.20% / 1.07% (0.54)% - (0.08)% / (0.37)% 0.50% - 0.50% / 0.50% 0.50% - 1.00% / 0.76% 0.50% - 7.72% / 1.60% Priced at Par
All Other Corporate Bonds - Public	328.4			- Change in Benchmark Reference - Comparability Adjustment - Discount for Size - Lack of Marketability - Volatility of Credit	(a) (b) (c) (d) (e)	(0.88)% - (0.88)% / (0.88)% (0.30)% - 1.00% / 0.10% (0.57)% - (0.57)% / (0.57)% 0.05% - 0.20% / 0.13% (0.30)% - 0.30% / 0.10%
Equity Securities - Private	4.0			- Market Convention	(f)	Priced at Cost or Owner's Equity
Embedded Derivative in Modified Coinsurance Arrangement	(77.5		)	- Projected Liability Cash Flows	(g)	Actuarial Assumptions

	December 31, 2012
	Fair Value			Unobservable Input		Range/Weighted Average
	(in millions of dollars)
Fixed Maturity Securities
States, Municipalities, and Political Subdivisions - Private	$	42.7		- Comparability Adjustment - Lack of Marketability - Volatility of Credit	(b) (d) (e)	0.25% - 0.25% / 0.25% 0.25% - 0.25% / 0.25% 0.15% - 0.15% / 0.15%
Public Utilities	17.4			- Comparability Adjustment	(b)	0.20% - 0.20% / 0.20%
Mortgage/Asset-Backed Securities - Private	0.5			- Discount for Size	(c)	5.74% - 5.84% / 5.81%
All Other Corporate Bonds - Private	391.8			- Change in Benchmark Reference - Comparability Adjustment - Discount for Size - Lack of Marketability - Volatility of Credit - Market Convention	(a) (b) (c) (d) (e) (f)	0.04% - 2.89% / 0.28% 1.48% - 1.48% / 1.48% 0.10% - 0.50% / 0.24% 0.10% - 1.00% / 0.46% (0.25)% -7.72% / 1.51% Priced at Par
All Other Corporate Bonds - Public	165.0			- Change in Benchmark Reference - Comparability Adjustment - Discount for Size - Lack of Marketability - Volatility of Credit - Market Convention	(a) (b) (c) (d) (e) (f)	0.25% - 0.25% / 0.25% (0.59)% - 1.00% / 0.27% 0.25% - 0.25% / 0.25% 0.20% - 0.30% / 0.24% (0.30)% - (0.30)% / (0.30)% Priced at Par
Equity Securities - Private	4.0			- Market Convention	(f)	Priced at Cost or Owner's Equity
Embedded Derivative in Modified Coinsurance Arrangement	(83.9		)	- Projected Liability Cash Flows	(g)	Actuarial Assumptions

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

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

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

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

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

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

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

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

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Significant Accounting Policies

3 Months Ended

Mar. 31, 2013

Significant Accounting Policies [Abstract]

Significant Accounting Policies

Accounting Developments

Accounting Updates Adopted in 2013:

Accounting Standards Codification (ASC) 210 "Balance Sheet - Disclosures about Offsetting Assets and Liabilities"

In December 2011, the Financial Accounting Standards Board (FASB) issued an update requiring 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 provide information about the effect or potential effect of netting arrangements on an entity's financial position, including the effect or potential effect of rights of set-off associated with certain financial instruments and derivative instruments. In January 2013, the FASB issued an update to clarify the scope of transactions that are subject to the disclosures about offsetting. Specifically, the update applies only to derivatives, repurchase agreements and reverse repurchase agreements, and securities borrowing and securities lending transactions to the extent they are subject to a master netting arrangement or similar agreement. We adopted these updates effective January 1, 2013. The adoption of these updates expanded our disclosures but had no effect on our financial position or results of operations.

ASC 220 "Comprehensive Income"

In February 2013, the FASB issued an update to improve the transparency of reporting reclassifications out of accumulated other comprehensive income by requiring additional information to be presented regarding certain reclassification adjustments. We adopted this update effective January 1, 2013. The adoption of this update expanded our disclosures but had no effect on our financial position or results of operations.

Accounting Updates Adopted in 2012:

ASC 220 "Comprehensive Income"

In June 2011, the 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. 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.

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Investments (Tables)

3 Months Ended

Mar. 31, 2013

Notes to Financial Statements [Abstract]

Schedule of Available-for-sale Securities Reconciliation

At March 31, 2013 and December 31, 2012, 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, 2013
	Amortized Cost		Gross Unrealized Gain		Gross Unrealized Loss		Fair Value
	(in millions of dollars)
United States Government and Government Agencies and Authorities	$	1,027.3	$	309.2	$	1.4	$	1,335.1
States, Municipalities, and Political Subdivisions	1,550.8		308.5		5.5		1,853.8
Foreign Governments	1,197.3		260.5		—		1,457.8
Public Utilities	9,316.7		1,782.4		9.9		11,089.2
Mortgage/Asset-Backed Securities	1,767.1		275.6		0.5		2,042.2
All Other Corporate Bonds	22,740.4		3,907.7		29.0		26,619.1
Redeemable Preferred Stocks	33.0		6.3		—		39.3
Total Fixed Maturity Securities	$	37,632.6	$	6,850.2	$	46.3	$	44,436.5

	December 31, 2012
	Amortized Cost		Gross Unrealized Gain		Gross Unrealized Loss		Fair Value
	(in millions of dollars)
United States Government and Government Agencies and Authorities	$	1,020.9	$	329.0	$	1.1	$	1,348.8
States, Municipalities, and Political Subdivisions	1,498.4		316.2		7.8		1,806.8
Foreign Governments	1,280.4		226.6		—		1,507.0
Public Utilities	9,294.3		1,865.0		15.1		11,144.2
Mortgage/Asset-Backed Securities	1,927.9		289.1		0.5		2,216.5
All Other Corporate Bonds	22,696.6		4,245.3		31.5		26,910.4
Redeemable Preferred Stocks	33.0		6.3		—		39.3
Total Fixed Maturity Securities	$	37,751.5	$	7,277.5	$	56.0	$	44,973.0

As of March 31, 2013 and December 31, 2012, 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 have been in a gross unrealized loss position.

	March 31, 2013
	Less Than 12 Months				12 Months or Greater
	Fair Value		Gross Unrealized Loss		Fair Value		Gross Unrealized Loss
	(in millions of dollars)
United States Government and Government Agencies and Authorities	$	—	$	—	$	6.2	$	1.4
States, Municipalities, and Political Subdivisions	91.0		1.8		45.3		3.7
Public Utilities	224.4		4.1		57.4		5.8
Mortgage/Asset-Backed Securities	2.5		—		3.8		0.5
All Other Corporate Bonds	843.4		14.9		323.8		14.1
Total Fixed Maturity Securities	$	1,161.3	$	20.8	$	436.5	$	25.5

	December 31, 2012
	Less Than 12 Months				12 Months or Greater
	Fair Value		Gross Unrealized Loss		Fair Value		Gross Unrealized Loss
	(in millions of dollars)
United States Government and Government Agencies and Authorities	$	—	$	—	$	6.5	$	1.1
States, Municipalities, and Political Subdivisions	30.8		0.9		42.1		6.9
Public Utilities	110.3		3.9		147.6		11.2
Mortgage/Asset-Backed Securities	4.4		—		3.8		0.5
All Other Corporate Bonds	441.3		7.0		396.8		24.5
Total Fixed Maturity Securities	$	586.8	$	11.8	$	596.8	$	44.2

Distribution of the Maturity Dates for Fixed Maturity Securities

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

	March 31, 2013
	Total Amortized Cost		Unrealized Gain Position				Unrealized Loss Position
			Gross Gain		Fair Value		Gross Loss		Fair Value
	(in millions of dollars)
1 year or less	$	1,059.7	$	23.6	$	1,040.1	$	0.2	$	43.0
Over 1 year through 5 years	5,927.8		654.8		6,501.5		1.7		79.4
Over 5 years through 10 years	9,756.5		1,548.7		10,799.5		8.0		497.7
Over 10 years	19,121.5		4,347.5		22,461.7		35.9		971.4
	35,865.5		6,574.6		40,802.8		45.8		1,591.5
Mortgage/Asset-Backed Securities	1,767.1		275.6		2,035.9		0.5		6.3
Total Fixed Maturity Securities	$	37,632.6	$	6,850.2	$	42,838.7	$	46.3	$	1,597.8

	December 31, 2012
	Total Amortized Cost		Unrealized Gain Position				Unrealized Loss Position
			Gross Gain		Fair Value		Gross Loss		Fair Value
	(in millions of dollars)
1 year or less	$	956.4	$	21.2	$	934.1	$	0.5	$	43.0
Over 1 year through 5 years	5,922.8		628.1		6,449.8		5.0		96.1
Over 5 years through 10 years	9,752.3		1,606.4		10,997.0		7.6		354.1
Over 10 years	19,192.1		4,732.7		23,200.2		42.4		682.2
	35,823.6		6,988.4		41,581.1		55.5		1,175.4
Mortgage/Asset-Backed Securities	1,927.9		289.1		2,208.3		0.5		8.2
Total Fixed Maturity Securities	$	37,751.5	$	7,277.5	$	43,789.4	$	56.0	$	1,183.6

Mortgage Loans by Property Type

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

	March 31, 2013				December 31, 2012
	(in millions of dollars)
	Carrying		Percent of		Carrying		Percent of
	Amount		Total		Amount		Total
Property Type
Apartment	$	33.8	2.0	%	$	34.0	2.0	%
Industrial	518.0		29.9		513.4		30.0
Mixed	77.8		4.5		78.4		4.6
Office	730.6		42.2		713.4		41.6
Retail	370.2		21.4		373.5		21.8
Total	$	1,730.4	100.0	%	$	1,712.7	100.0	%

Mortgage Loans by Geographic Region

Region
New England	$	113.2	6.5	%	$	114.3	6.7	%
Mid-Atlantic	158.9		9.2		160.0		9.3
East North Central	233.1		13.5		224.7		13.1
West North Central	158.0		9.1		160.8		9.4
South Atlantic	437.8		25.3		440.9		25.7
East South Central	79.1		4.6		79.6		4.7
West South Central	157.8		9.1		159.5		9.3
Mountain	89.6		5.2		90.5		5.3
Pacific	302.9		17.5		282.4		16.5
Total	$	1,730.4	100.0	%	$	1,712.7	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 2013		December 31 2012
	(in millions of dollars)
Internal Rating
Aa	$	11.3	$	11.5
A	660.8		659.4
Baa	1,005.6		994.5
Ba	39.6		34.2
B	13.1		13.1
Total	$	1,730.4	$	1,712.7

Mortgage Loans, Sorted by Applicable Credit Quality Indicators, Loan to Value Ratio

Loan-to-Value Ratio
<= 65%	$	657.8	$	624.7
> 65% <= 75%	847.3		858.8
> 75% <= 85%	131.5		142.5
> 85%	93.8		86.7
Total	$	1,730.4	$	1,712.7

Activity in the Allowance for Credit Losses

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

	Three Months Ended March 31
	2013		2012
	(in millions of dollars)
Balance at Beginning of Year	$	1.5	$	1.5
Provision	—		0.5
Balance at End of Period	$	1.5	$	2.0

Impaired Mortgage Loans

Impaired mortgage loans are as follows:

	March 31, 2013
	(in millions of dollars)
			Unpaid
	Recorded		Principal		Related
	Investment		Balance		Allowance
With No Related Allowance Recorded	$	4.3	$	4.3	$	—
With an Allowance Recorded	13.1		14.6		1.5
Total	$	17.4	$	18.9	$	1.5
	December 31, 2012
	(in millions of dollars)
			Unpaid
	Recorded		Principal		Related
	Investment		Balance		Allowance
With No Related Allowance Recorded	$	4.3	$	4.3	$	—
With an Allowance Recorded	13.1		14.6		1.5
Total	$	17.4	$	18.9	$	1.5

Schedule of Financial Instrument and Derivative Offsetting [Table Text Block]

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

	Offsetting of Financial Assets and Derivative Assets
	March 31, 2013
	Gross				Net Amount of		Gross Amount Not
	Amount of		Gross Amount		Assets		Offset in Balance Sheet
	Recognized		Offset in		Presented in		Financial			Cash Collateral
	Assets		Balance Sheet		Balance Sheet		Instruments			Received			Net Amount
	(in millions of dollars)
Derivatives	$	62.1	$	—	$	62.1	$	(53.6	)	$	—		$	8.5
Securities Lending	234.0		—		234.0		—			(234.0		)	—
Total	$	296.1	$	—	$	296.1	$	(53.6	)	$	(234.0	)	$	8.5
	Offsetting of Financial Liabilities and Derivative Liabilities
	March 31, 2013
	Gross				Net Amount of		Gross Amount Not
	Amount of		Gross Amount		Liabilities		Offset in Balance Sheet
	Recognized		Offset in		Presented in		Financial			Cash Collateral
	Liabilities		Balance Sheet		Balance Sheet		Instruments			Pledged			Net Amount
	(in millions of dollars)
Derivatives	$	157.4	$	—	$	157.4	$	(117.7	)	$	(1.8	)	$	37.9
Securities Lending	236.3		—		236.3		(234.0		)	—			2.3
Total	$	393.7	$	—	$	393.7	$	(351.7	)	$	(1.8	)	$	40.2

	Offsetting of Financial Assets and Derivative Assets
	December 31, 2012
	Gross				Net Amount of		Gross Amount Not
	Amount of		Gross Amount		Assets		Offset in Balance Sheet
	Recognized		Offset in		Presented in		Financial			Cash Collateral
	Assets		Balance Sheet		Balance Sheet		Instruments			Received			Net Amount
	(in millions of dollars)
Derivatives	$	81.6	$	—	$	81.6	$	(72.9	)	$	—		$	8.7
Securities Lending	452.8		—		452.8		—			(452.8		)	—
Total	$	534.4	$	—	$	534.4	$	(72.9	)	$	(452.8	)	$	8.7
	Offsetting of Financial Liabilities and Derivative Liabilities
	December 31, 2012
	Gross				Net Amount of		Gross Amount Not
	Amount of		Gross Amount		Liabilities		Offset in Balance Sheet
	Recognized		Offset in		Presented in		Financial			Cash Collateral
	Liabilities		Balance Sheet		Balance Sheet		Instruments			Pledged			Net Amount
	(in millions of dollars)
Derivatives	$	170.5	$	—	$	170.5	$	(129.8	)	$	(1.8	)	$	38.9
Securities Lending	455.8		—		455.8		(452.8		)	—			3.0
Total	$	626.3	$	—	$	626.3	$	(582.6	)	$	(1.8	)	$	41.9

Investment Income [Table Text Block]

Net Investment Income

Net investment income reported in our consolidated statements of income is as follows:

	Three Months Ended March 31
	2013		2012
	(in millions of dollars)
Fixed Maturity Securities	$	589.9	$	595.5
Derivative Financial Instruments	7.7		6.3
Mortgage Loans	26.0		25.0
Policy Loans	3.7		3.6
Other Long-term Investments	7.7		3.2
Short-term Investments	0.8		1.2
Gross Investment Income	635.8		634.8
Less Investment Expenses	7.1		7.2
Less Investment Income on PFA Assets	4.0		4.1
Less Amortization of Tax Credit Partnerships	3.6		4.0
Net Investment Income	$	621.1	$	619.5

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
	2013			2012
	(in millions of dollars)
Fixed Maturity Securities
Gross Gains on Sales	$	6.6		$	5.9
Gross Losses on Sales	(5.5		)	(5.0		)
Other-Than-Temporary Impairment Loss	(0.8		)	—
Mortgage Loans and Other Invested Assets
Gross Gains on Sales	7.6			—
Impairment Loss	(1.0		)	(0.5		)
Embedded Derivative in Modified Coinsurance Arrangement	6.4			12.3
Other Derivatives	(0.3		)	—
Foreign Currency Transactions	(2.7		)	(0.3		)
Net Realized Investment Gain	$	10.3		$	12.4

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Commitments and Contingent Liabilities

3 Months Ended

Mar. 31, 2013

Notes to Financial Statements [Abstract]

Commitments and Contingent Liabilities

Contingent Liabilities

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

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

Claims Handling Matters

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

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

Miscellaneous Matters

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

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 class action alleges 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 the Employee Retirement Income Security Act (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. In February 2012, the District Court issued an opinion rejecting both of plaintiffs' principal theories and ordering judgment for us. At the same time, however, the District Court held that we breached a fiduciary duty to the beneficiaries by failing to pay rates comparable to the best rates available in the market for demand deposits. The District Court also certified a class of people who, during a certain period of time, were beneficiaries under certain group life insurance contracts that were part of ERISA employee welfare benefit plans and were paid death benefits using retained asset accounts.  The District Court authorized the parties to make an immediate appeal of its decision to the First Circuit Court of Appeals, and each of the parties sought leave for an early appeal on the issues raised by the District Court's rulings, but the First Circuit decided not to hear the appeal at this time. Therefore, the parties are required to wait until the proceedings in the District Court have concluded for further resolution of those issues. The First Circuit did not rule on or discuss the merits of the case. The case is proceeding in the District Court where notice to class members and discovery on the issue of damages have been completed. In February 2013, we filed a motion requesting the court reconsider its prior summary judgment ruling as well as a motion challenging the admissibility of the testimony of plaintiffs' expert witness. On April 10, 2013, the court denied our motion for reconsideration and reserved its ruling regarding the admissibility of testimony from plaintiffs' expert witness. The case has been placed on a trial list for June 2013.

In March 2011, we received a request for information from an independent third party as part of an examination on behalf of 32 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.

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 December 2012, State of West Virginia ex rel. John D. Perdue v. Provident Life and Accident Insurance Company and State of West Virginia ex rel. John D. Perdue v. Colonial Life & Accident Insurance Company were filed in the Circuit Court of Putnam County, West Virginia. These two separate complaints allege violations of the West Virginia Uniform Unclaimed Property Act by failing to identify and report all unclaimed insurance policy proceeds due to be escheated to West Virginia.  The complaints seek to examine company records and assess penalties and costs in an undetermined amount. On April 1, 2013, we filed motions to dismiss both complaints.

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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Accumulated Other Comprehensive Income

3 Months Ended

Mar. 31, 2013

Accumulated Other Comprehensive Income [Abstract]

Comprehensive Income (Loss) Note [Text Block]

After-tax accumulated other comprehensive income (loss) balances and related changes are as follows:

		Net Unrealized Gain on Securities			Net Gain on Cash Flow Hedges			Foreign Currency Translation Adjustment			Unrecognized Pension and Postretirement Benefit Costs			Total
		(in millions of dollars)
Balance at December 31, 2012		$	873.5		$	401.6		$	(72.6	)	$	(574.5	)	$	628.0
	Other Comprehensive Income (Loss) Before Reclassifications	(73.3		)	(1.2		)	(69.9		)	1.7			(142.7		)
	Amounts Reclassified from Accumulated Other Comprehensive Income or Loss	(7.8		)	(0.8		)	—			9.0			0.4
	Net Other Comprehensive Income (Loss)	(81.1		)	(2.0		)	(69.9		)	10.7			(142.3		)
Balance at March 31, 2013		$	792.4		$	399.6		$	(142.5	)	$	(563.8	)	$	485.7

The net unrealized gain on securities consists of the following components:

	March 31			December 31
	2013			2012			Change
	(in millions of dollars)
Fixed Maturity Securities	$	6,803.9		$	7,221.5		$	(417.6	)
Other Investments	72.5			92.8			(20.3		)
Deferred Acquisition Costs	(61.2		)	(67.0		)	5.8
Reserves for Future Policy and Contract Benefits	(5,979.7		)	(6,277.5		)	297.8
Reinsurance Recoverable	353.9			351.5			2.4
Deferred Income Tax	(397.0		)	(447.8		)	50.8
Total	$	792.4		$	873.5		$	(81.1	)

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

			Three Months Ended March 31, 2013
			(in millions of dollars)
Net Unrealized Gain on Securities
	Net Realized Investment Gain
		Gain on Disposals of Securities and Other Invested Assets	$	11.9
	Income Tax		4.1
	Total		$	7.8
Net Gain on Cash Flow Hedges
	Net Investment Income
		Gain on Interest Rate Swaps and Forwards	$	10.0
		Loss on Foreign Exchange Contracts	(1.7		)
	Net Realized Investment Gain
		Loss on Foreign Exchange Contracts	(6.7		)
	Interest and Debt Expense
		Loss on Interest Rate Swaps	(0.4		)
			1.2
	Income Tax		0.4
	Total		$	0.8
Unrecognized Pension and Postretirement Benefit Costs
	Other Expenses
		Amortization of Net Actuarial Loss	$	(14.9	)
		Amortization of Prior Service Credit	1.2
			(13.7		)
	Income Tax Benefit		(4.7		)
	Total		$	(9.0	)

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Assets by Segment (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Segment Reporting Information [Line Items]
Assets	$ 61,611.4	$ 62,236.1
Unum U.S.
Segment Reporting Information [Line Items]
Assets	19,097.5	19,391.2
Unum U.K.
Segment Reporting Information [Line Items]
Assets	3,664.8	3,975.8
Colonial Life
Segment Reporting Information [Line Items]
Assets	3,438.8	3,434.9
Closed Block
Segment Reporting Information [Line Items]
Assets	32,885.5	33,069.2
Corporate
Segment Reporting Information [Line Items]
Assets	$ 2,524.8	$ 2,365.0

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Investments

3 Months Ended

Mar. 31, 2013

Notes to Financial Statements [Abstract]

Investments

Fixed Maturity Securities

At March 31, 2013 and December 31, 2012, 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, 2013
	Amortized Cost		Gross Unrealized Gain		Gross Unrealized Loss		Fair Value
	(in millions of dollars)
United States Government and Government Agencies and Authorities	$	1,027.3	$	309.2	$	1.4	$	1,335.1
States, Municipalities, and Political Subdivisions	1,550.8		308.5		5.5		1,853.8
Foreign Governments	1,197.3		260.5		—		1,457.8
Public Utilities	9,316.7		1,782.4		9.9		11,089.2
Mortgage/Asset-Backed Securities	1,767.1		275.6		0.5		2,042.2
All Other Corporate Bonds	22,740.4		3,907.7		29.0		26,619.1
Redeemable Preferred Stocks	33.0		6.3		—		39.3
Total Fixed Maturity Securities	$	37,632.6	$	6,850.2	$	46.3	$	44,436.5

	December 31, 2012
	Amortized Cost		Gross Unrealized Gain		Gross Unrealized Loss		Fair Value
	(in millions of dollars)
United States Government and Government Agencies and Authorities	$	1,020.9	$	329.0	$	1.1	$	1,348.8
States, Municipalities, and Political Subdivisions	1,498.4		316.2		7.8		1,806.8
Foreign Governments	1,280.4		226.6		—		1,507.0
Public Utilities	9,294.3		1,865.0		15.1		11,144.2
Mortgage/Asset-Backed Securities	1,927.9		289.1		0.5		2,216.5
All Other Corporate Bonds	22,696.6		4,245.3		31.5		26,910.4
Redeemable Preferred Stocks	33.0		6.3		—		39.3
Total Fixed Maturity Securities	$	37,751.5	$	7,277.5	$	56.0	$	44,973.0

As of March 31, 2013 and December 31, 2012, we held no fixed maturity securities for which a portion of an other-than-temporary impairment had previously been recognized in other comprehensive income.

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

	March 31, 2013
	Less Than 12 Months				12 Months or Greater
	Fair Value		Gross Unrealized Loss		Fair Value		Gross Unrealized Loss
	(in millions of dollars)
United States Government and Government Agencies and Authorities	$	—	$	—	$	6.2	$	1.4
States, Municipalities, and Political Subdivisions	91.0		1.8		45.3		3.7
Public Utilities	224.4		4.1		57.4		5.8
Mortgage/Asset-Backed Securities	2.5		—		3.8		0.5
All Other Corporate Bonds	843.4		14.9		323.8		14.1
Total Fixed Maturity Securities	$	1,161.3	$	20.8	$	436.5	$	25.5

	December 31, 2012
	Less Than 12 Months				12 Months or Greater
	Fair Value		Gross Unrealized Loss		Fair Value		Gross Unrealized Loss
	(in millions of dollars)
United States Government and Government Agencies and Authorities	$	—	$	—	$	6.5	$	1.1
States, Municipalities, and Political Subdivisions	30.8		0.9		42.1		6.9
Public Utilities	110.3		3.9		147.6		11.2
Mortgage/Asset-Backed Securities	4.4		—		3.8		0.5
All Other Corporate Bonds	441.3		7.0		396.8		24.5
Total Fixed Maturity Securities	$	586.8	$	11.8	$	596.8	$	44.2

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

	March 31, 2013
	Total Amortized Cost		Unrealized Gain Position				Unrealized Loss Position
			Gross Gain		Fair Value		Gross Loss		Fair Value
	(in millions of dollars)
1 year or less	$	1,059.7	$	23.6	$	1,040.1	$	0.2	$	43.0
Over 1 year through 5 years	5,927.8		654.8		6,501.5		1.7		79.4
Over 5 years through 10 years	9,756.5		1,548.7		10,799.5		8.0		497.7
Over 10 years	19,121.5		4,347.5		22,461.7		35.9		971.4
	35,865.5		6,574.6		40,802.8		45.8		1,591.5
Mortgage/Asset-Backed Securities	1,767.1		275.6		2,035.9		0.5		6.3
Total Fixed Maturity Securities	$	37,632.6	$	6,850.2	$	42,838.7	$	46.3	$	1,597.8

	December 31, 2012
	Total Amortized Cost		Unrealized Gain Position				Unrealized Loss Position
			Gross Gain		Fair Value		Gross Loss		Fair Value
	(in millions of dollars)
1 year or less	$	956.4	$	21.2	$	934.1	$	0.5	$	43.0
Over 1 year through 5 years	5,922.8		628.1		6,449.8		5.0		96.1
Over 5 years through 10 years	9,752.3		1,606.4		10,997.0		7.6		354.1
Over 10 years	19,192.1		4,732.7		23,200.2		42.4		682.2
	35,823.6		6,988.4		41,581.1		55.5		1,175.4
Mortgage/Asset-Backed Securities	1,927.9		289.1		2,208.3		0.5		8.2
Total Fixed Maturity Securities	$	37,751.5	$	7,277.5	$	43,789.4	$	56.0	$	1,183.6

At March 31, 2013, the fair value of investment-grade fixed maturity securities was $41,295.1 million, with a gross unrealized gain of $6,647.8 million and a gross unrealized loss of $27.8 million. The gross unrealized loss on investment-grade fixed maturity securities was 60.0 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, 2013, the fair value of below-investment-grade fixed maturity securities was $3,141.4 million, with a gross unrealized gain of $202.4 million and a gross unrealized loss of $18.5 million. The gross unrealized loss on below-investment-grade fixed maturity securities was 40.0 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, 2013, 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, 2013, we held 64 individual investment-grade fixed maturity securities and 33 individual below-investment-grade fixed maturity securities that were in an unrealized loss position, of which 15 investment-grade fixed maturity securities and 14 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

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.

At March 31, 2013, we had non-binding commitments of $153.0 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, 2013, the carrying amount of our variable interest entity investments that are not consolidated under the provisions of GAAP was $431.7 million, comprised of $326.3 million of tax credit partnerships and $105.4 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 $75.7 million at March 31, 2013. 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 also had non-binding commitments of $107.8 million to fund certain private equity partnerships at March 31, 2013, 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 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 and partnerships were $141.8 million and $6.7 million, respectively, as of March 31, 2013.  The bonds are reported as fixed maturity securities, and the partnerships are reported as other long-term investments in our consolidated balance sheets. At March 31, 2013, 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, 2013 and 2012.

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, 2013				December 31, 2012
	(in millions of dollars)
	Carrying		Percent of		Carrying		Percent of
	Amount		Total		Amount		Total
Property Type
Apartment	$	33.8	2.0	%	$	34.0	2.0	%
Industrial	518.0		29.9		513.4		30.0
Mixed	77.8		4.5		78.4		4.6
Office	730.6		42.2		713.4		41.6
Retail	370.2		21.4		373.5		21.8
Total	$	1,730.4	100.0	%	$	1,712.7	100.0	%

Region
New England	$	113.2	6.5	%	$	114.3	6.7	%
Mid-Atlantic	158.9		9.2		160.0		9.3
East North Central	233.1		13.5		224.7		13.1
West North Central	158.0		9.1		160.8		9.4
South Atlantic	437.8		25.3		440.9		25.7
East South Central	79.1		4.6		79.6		4.7
West South Central	157.8		9.1		159.5		9.3
Mountain	89.6		5.2		90.5		5.3
Pacific	302.9		17.5		282.4		16.5
Total	$	1,730.4	100.0	%	$	1,712.7	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

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 2013		December 31 2012
	(in millions of dollars)
Internal Rating
Aa	$	11.3	$	11.5
A	660.8		659.4
Baa	1,005.6		994.5
Ba	39.6		34.2
B	13.1		13.1
Total	$	1,730.4	$	1,712.7

Loan-to-Value Ratio
<= 65%	$	657.8	$	624.7
> 65% <= 75%	847.3		858.8
> 75% <= 85%	131.5		142.5
> 85%	93.8		86.7
Total	$	1,730.4	$	1,712.7

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 a 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 and the determination of whether a borrower can make the contractual payments are inherently subjective, and methodologies may vary depending on the circumstances specific to a 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
	2013		2012
	(in millions of dollars)
Balance at Beginning of Year	$	1.5	$	1.5
Provision	—		0.5
Balance at End of Period	$	1.5	$	2.0

Impaired mortgage loans are as follows:

	March 31, 2013
	(in millions of dollars)
			Unpaid
	Recorded		Principal		Related
	Investment		Balance		Allowance
With No Related Allowance Recorded	$	4.3	$	4.3	$	—
With an Allowance Recorded	13.1		14.6		1.5
Total	$	17.4	$	18.9	$	1.5
	December 31, 2012
	(in millions of dollars)
			Unpaid
	Recorded		Principal		Related
	Investment		Balance		Allowance
With No Related Allowance Recorded	$	4.3	$	4.3	$	—
With an Allowance Recorded	13.1		14.6		1.5
Total	$	17.4	$	18.9	$	1.5

For the three months ended March 31, 2013 and 2012, our average investment in impaired mortgage loans was $17.4 million and $23.7 million, respectively. For each of the three months ended March 31, 2013 and 2012, we recognized $0.2 million of interest income on mortgage loans subsequent to impairment.

We had no troubled debt restructurings during the three months ended March 31, 2013. We had one loan foreclosure with a carrying amount of $4.2 million that qualified as a troubled debt restructuring during the three months ended March 31, 2012.

We had no realized losses on loan foreclosures for the three months ended March 31, 2013 and 2012, other than the initial impairment losses recognized prior to foreclosure.

For mortgage loans that are past due regarding principal and/or interest payments and for which collection of investment income is uncertain, we discontinue the accrual of investment income. At March 31, 2013 and December 31, 2012, we had no mortgage loans greater than 90 days past due for which we were still accruing interest income. At March 31, 2013 and December 31, 2012, we held one mortgage loan that was greater than 90 days past due and had a carrying value of $4.3 million.

At March 31, 2013, we had non-binding commitments of $48.2 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.

We account for all of our securities lending agreements and repurchase agreements as collateralized financings. As of March 31, 2013, the carrying amount of fixed maturity securities loaned to third parties under our securities lending program was $234.0 million, for which we received collateral in the form of cash and securities of $236.3 million and $6.5 million, respectively. As of December 31, 2012, the carrying amount of fixed maturity securities loaned to third parties under our securities lending program was $452.8 million, for which we received collateral in the form of cash and securities of $455.8 million and $14.5 million, respectively. We had no outstanding repurchase agreements at March 31, 2013 or December 31, 2012.

Offsetting of Financial Instruments

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

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

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

	Offsetting of Financial Assets and Derivative Assets
	March 31, 2013
	Gross				Net Amount of		Gross Amount Not
	Amount of		Gross Amount		Assets		Offset in Balance Sheet
	Recognized		Offset in		Presented in		Financial			Cash Collateral
	Assets		Balance Sheet		Balance Sheet		Instruments			Received			Net Amount
	(in millions of dollars)
Derivatives	$	62.1	$	—	$	62.1	$	(53.6	)	$	—		$	8.5
Securities Lending	234.0		—		234.0		—			(234.0		)	—
Total	$	296.1	$	—	$	296.1	$	(53.6	)	$	(234.0	)	$	8.5
	Offsetting of Financial Liabilities and Derivative Liabilities
	March 31, 2013
	Gross				Net Amount of		Gross Amount Not
	Amount of		Gross Amount		Liabilities		Offset in Balance Sheet
	Recognized		Offset in		Presented in		Financial			Cash Collateral
	Liabilities		Balance Sheet		Balance Sheet		Instruments			Pledged			Net Amount
	(in millions of dollars)
Derivatives	$	157.4	$	—	$	157.4	$	(117.7	)	$	(1.8	)	$	37.9
Securities Lending	236.3		—		236.3		(234.0		)	—			2.3
Total	$	393.7	$	—	$	393.7	$	(351.7	)	$	(1.8	)	$	40.2

	Offsetting of Financial Assets and Derivative Assets
	December 31, 2012
	Gross				Net Amount of		Gross Amount Not
	Amount of		Gross Amount		Assets		Offset in Balance Sheet
	Recognized		Offset in		Presented in		Financial			Cash Collateral
	Assets		Balance Sheet		Balance Sheet		Instruments			Received			Net Amount
	(in millions of dollars)
Derivatives	$	81.6	$	—	$	81.6	$	(72.9	)	$	—		$	8.7
Securities Lending	452.8		—		452.8		—			(452.8		)	—
Total	$	534.4	$	—	$	534.4	$	(72.9	)	$	(452.8	)	$	8.7
	Offsetting of Financial Liabilities and Derivative Liabilities
	December 31, 2012
	Gross				Net Amount of		Gross Amount Not
	Amount of		Gross Amount		Liabilities		Offset in Balance Sheet
	Recognized		Offset in		Presented in		Financial			Cash Collateral
	Liabilities		Balance Sheet		Balance Sheet		Instruments			Pledged			Net Amount
	(in millions of dollars)
Derivatives	$	170.5	$	—	$	170.5	$	(129.8	)	$	(1.8	)	$	38.9
Securities Lending	455.8		—		455.8		(452.8		)	—			3.0
Total	$	626.3	$	—	$	626.3	$	(582.6	)	$	(1.8	)	$	41.9

Net Investment Income

Net investment income reported in our consolidated statements of income is as follows:

	Three Months Ended March 31
	2013		2012
	(in millions of dollars)
Fixed Maturity Securities	$	589.9	$	595.5
Derivative Financial Instruments	7.7		6.3
Mortgage Loans	26.0		25.0
Policy Loans	3.7		3.6
Other Long-term Investments	7.7		3.2
Short-term Investments	0.8		1.2
Gross Investment Income	635.8		634.8
Less Investment Expenses	7.1		7.2
Less Investment Income on PFA Assets	4.0		4.1
Less Amortization of Tax Credit Partnerships	3.6		4.0
Net Investment Income	$	621.1	$	619.5

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
	2013			2012
	(in millions of dollars)
Fixed Maturity Securities
Gross Gains on Sales	$	6.6		$	5.9
Gross Losses on Sales	(5.5		)	(5.0		)
Other-Than-Temporary Impairment Loss	(0.8		)	—
Mortgage Loans and Other Invested Assets
Gross Gains on Sales	7.6			—
Impairment Loss	(1.0		)	(0.5		)
Embedded Derivative in Modified Coinsurance Arrangement	6.4			12.3
Other Derivatives	(0.3		)	—
Foreign Currency Transactions	(2.7		)	(0.3		)
Net Realized Investment Gain	$	10.3		$	12.4

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Derivative Financial Instruments

3 Months Ended

Mar. 31, 2013

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, foreign currency risk, and credit 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, forward contracts on specific fixed income securities, and credit default swaps. Transactions hedging interest rate risk are primarily associated with our individual and group long-term care and individual and group disability products. All other product portfolios are periodically reviewed to determine if hedging strategies would be appropriate for risk management purposes.

Derivatives designated as cash flow hedges and used to reduce our exposure to interest rate and duration risk 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. We use interest rate swaps to hedge the anticipated purchase of fixed maturity securities thereby protecting us from the potential adverse impact of declining interest rates on the associated policy reserves. We also use interest rate swaps to hedge the potential adverse impact of rising interest rates in anticipation of issuing fixed rate long-term debt.

• 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.

Derivatives designated as fair value hedges and used to reduce our exposure to interest rate and duration risk 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.

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

• 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.

• Foreign currency forward contracts are used to minimize foreign currency risks. A foreign currency forward is a derivative without an initial investment where we and the counterparty agree to exchange a specific amount of currencies, at a specific exchange rate, on a specific date. We have used these forward contracts to hedge the foreign currency risk associated with certain of the debt repayments of the U.S. dollar-denominated debt issued by one of our U.K. subsidiaries and to hedge the currency risk of certain foreign currency-denominated fixed maturity securities owned for diversification purposes.

Derivatives not designated as hedging instruments and used to reduce our exposure to credit losses on securities owned are as follows:

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

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 $8.5 million at March 31, 2013. We held no cash collateral from our counterparties as of March 31, 2013 and December 31, 2012. 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 $92.4 million and $108.6 million at March 31, 2013 and December 31, 2012, respectively. We had $1.8 million cash posted as collateral to our counterparties at March 31, 2013 and December 31, 2012.

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 $157.4 million and $170.5 million at March 31, 2013 and December 31, 2012, respectively.

Derivative Transactions

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		Credit Default		Forwards		Total
	(in millions of dollars)
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
Balance at December 31, 2012	$	174.0	$	508.8	$	750.0	$	—	$	—	$	1,432.8
Additions	—		—		—		70.0		24.0		94.0
Terminations	—		18.0		40.0		—		24.0		82.0
Balance at March 31, 2013	$	174.0	$	490.8	$	710.0	$	70.0	$	—	$	1,444.8

The following table summarizes the timing of anticipated settlements of interest rate swaps outstanding under our cash flow hedging programs at March 31, 2013, whereby we receive a fixed rate and pay a variable rate. The weighted average variable interest rates assume current market conditions.

	2013
	(in millions of dollars)
Notional Value	$	110.0
Weighted Average Receive Rate	6.71		%
Weighted Average Pay Rate	0.28		%

Cash Flow Hedges

As of March 31, 2013 and December 31, 2012, we had $110.0 million and $150.0 million, respectively, notional amount of forward starting interest rate swaps to hedge the anticipated purchase of fixed maturity securities and $490.8 million and $508.8 million, respectively, notional amount of open current and forward foreign currency swaps to hedge fixed income foreign currency-denominated securities.

For the three months ended March 31, 2013 and 2012, 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, 2013, we expect to amortize approximately $43.2 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, 2013. Fluctuations in fair values of these derivatives between March 31, 2013 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, 2013, we are hedging the variability of future cash flows associated with forecasted transactions through the year 2038.

Fair Value Hedges

As of March 31, 2013 and December 31, 2012, 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 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, 2013 and 2012, the change in fair value of the hedged fixed maturity securities attributable to the hedged benchmark interest rate resulted in a loss of $2.4 million and $1.7 million, respectively, with an offsetting gain on the related interest rate swaps.

As of March 31, 2013 and December 31, 2012, we had $600.0 million notional amount of receive fixed, pay variable interest rate swaps to hedge the changes in the fair value of certain fixed rate long-term debt. These swaps effectively convert the associated fixed rate long-term debt into floating rate debt and provide 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, 2013, the change in fair value of the hedged debt attributable to the hedged benchmark interest rate resulted in a gain of $4.1 million with an offsetting loss on the related interest rate swaps. 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 gain on the related interest rate swaps.

For the three months ended March 31, 2013 and 2012, 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

During the three months ended March 31, 2013, we purchased $70.0 million notional amount of single-name credit default swaps. We entered into these swaps in order to mitigate the credit risk associated with specific securities owned. Changes in the fair value of the derivative, together with the payment of periodic fees, are recognized in earnings as a component of net realized investment gain or loss during the period of change in fair value.

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. Changes in the fair value of the embedded derivative are recognized in earnings as a component of net realized investment gain or loss during the period of change in fair value.

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, 2013
	Asset Derivatives			Liability Derivatives
	Balance Sheet Location	Fair Value		Balance Sheet Location	Fair Value
	(in millions of dollars)
Designated as Hedging Instruments
Interest Rate Swaps	Other L-T Investments	$	59.6	Other Liabilities	$	31.2
Foreign Exchange Contracts	Other L-T Investments	2.5		Other Liabilities	125.5
Total		$	62.1		$	156.7
Not Designated as Hedging Instruments
Credit Default Swaps				Other Liabilities	$	0.7
Embedded Derivative in Modified Coinsurance Arrangement				Other Liabilities	77.5
Total					$	78.2

	December 31, 2012
	Asset Derivatives			Liability Derivatives
	Balance Sheet Location	Fair Value		Balance Sheet Location	Fair Value
	(in millions of dollars)
Designated as Hedging Instruments
Interest Rate Swaps	Other L-T Investments	$	76.5	Other Liabilities	$	31.7
Foreign Exchange Contracts	Other L-T Investments	5.1		Other Liabilities	138.8
Total		$	81.6		$	170.5
Not Designated as Hedging Instruments
Embedded Derivative in Modified Coinsurance Arrangement				Other Liabilities	$	83.9

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, 2013
	Gain Recognized in OCI on Derivatives (Effective Portion)			Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)
	(in millions of dollars)
Interest Rate Swaps and Forwards	$	(2.2	)	$	10.0		(1)
Interest Rate Swaps	—			(0.4		)	(3)
Foreign Exchange Contracts	—			(1.7		)	(1)
Foreign Exchange Contracts	4.1			(6.7		)	(2)
Total	$	1.9		$	1.2

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

(2) Loss recognized in net realized investment gain

(3) Loss recognized in interest and debt expense

	Three Months Ended March 31, 2012
	Gain Recognized in OCI on Derivatives (Effective Portion)			Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)
	(in millions of dollars)
Interest Rate Swaps and Forwards	$	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

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

	Three Months Ended March 31
	2013			2012
	(in millions of dollars)
Credit Default Swaps	$	(0.3	)	$	—
Embedded Derivative in Modified Coinsurance Arrangement	6.4			12.3
Gain Recognized in Net Realized Investment Gain	$	6.1		$	12.3

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Segment Information

3 Months Ended

Mar. 31, 2013

Segment Reporting [Abstract]

Segment Information

Our reporting segments are comprised of Unum US, Unum UK, Colonial Life, Closed Block, and Corporate.

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

	Three Months Ended March 31
	2013			2012
	(in millions of dollars)
Unum US
Group Disability
Group Long-term Disability	$	392.7		$	395.5
Group Short-term Disability	131.0			117.7
Group Life and Accidental Death & Dismemberment
Group Life	302.2			293.6
Accidental Death & Dismemberment	30.9			28.3
Supplemental and Voluntary
Individual Disability - Recently Issued	120.1			118.4
Voluntary Benefits	162.8			158.5
	1,139.7			1,112.0
Unum UK
Group Long-term Disability	97.9			101.9
Group Life	31.0			52.7
Supplemental and Voluntary	14.9			16.1
	143.8			170.7
Colonial Life
Accident, Sickness, and Disability	184.8			180.2
Life	54.8			51.7
Cancer and Critical Illness	67.5			64.4
	307.1			296.3
Closed Block
Individual Disability	181.8			187.2
Long-term Care	158.8			155.2
All Other	(0.3		)	0.5
	340.3			342.9
Total	$	1,930.9		$	1,921.9

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, 2013
Premium Income	$	1,139.7	$	143.8	$	307.1	$	340.3	$	—		$	1,930.9
Net Investment Income	235.7		30.8		39.7		313.1		1.8			621.1
Other Income	36.7		0.1		—		24.1		1.6			62.5
Operating Revenue	$	1,412.1	$	174.7	$	346.8	$	677.5	$	3.4		$	2,614.5
Operating Income (Loss)	$	208.1	$	31.3	$	75.4	$	27.3	$	(33.7	)	$	308.4
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

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
	2013			2012
	(in millions of dollars)
Operating Revenue by Segment	$	2,614.5		$	2,598.9
Net Realized Investment Gain	10.3			12.4
Total Revenue	$	2,624.8		$	2,611.3
Operating Income by Segment	$	308.4		$	309.2
Net Realized Investment Gain	10.3			12.4
Non-operating Retirement-related Loss	(14.9		)	(11.6		)
Income Tax	(91.2		)	(96.1		)
Net Income	$	212.6		$	213.9

Assets by segment are as follows:

	March 31		December 31
	2013		2012
	(in millions of dollars)
Unum US	$	19,097.5	$	19,391.2
Unum UK	3,664.8		3,975.8
Colonial Life	3,438.8		3,434.9
Closed Block	32,885.5		33,069.2
Corporate	2,524.8		2,365.0
Total	$	61,611.4	$	62,236.1

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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								12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013 Share Repurchase Program Expire In January 2014 [Member]	Jun. 30, 2012 Share Repurchase Program Expire In January 2014 [Member]	Mar. 31, 2013 Share Repurchase Program Expire In August 2012 [Member]	Mar. 31, 2011 Share Repurchase Program Expire In August 2012 [Member]	Mar. 31, 2013 shares repurchased on the open market [Member]	Mar. 31, 2012 shares repurchased on the open market [Member]	Dec. 31, 2012 shares repurchased on the open market [Member]
Stockholders Equity Note [Line Items]
Oustanding Stock Options, grant price range, lower limit	$ 11.37
Oustanding Stock Options, grant price range, upper limit	$ 26.29
Outstanding Nonvested stock awards, grant prices range, lower limit	$ 19.38
Outstanding Nonvested stock awards, grant prices range, upper limit	$ 26.31
Antidilutive common shares not included in the computation of dilutive earnings per share	400,000	2,200,000
Stock Repurchase Program, Authorized Amount				$ 750.0		$ 1,000.0
Stock Repurchase Program Remaining Authorized Repurchase Amount			$ 454.9		$ 0
Treasury Stock, Shares, Acquired							3,700,000	7,500,000	23,600,000
Preferred stock, authorized	25,000,000
Preferred stock, par value	$ 0.10
Preferred stock, issued	0

XML

Debt - Additional Information Domain (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Repayments of Long-term Debt	$ 71.2	$ 17.5
Northwind Holdings LLC [Member]
Debt Instrument, Periodic Payment, Principal	15.0
Tailwind Holdings LLC [Member]
Repayments of Long-term Debt	62.5
Gains (Losses) on Extinguishment of Debt	$ 4.0
Securities Pledged as Collateral [Member]
Short-term Debt, Description	entirely

XML

Net Income Per Common Share (Detail) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Numerator
Net Income	$ 212.6	$ 213.9
Denominator (000s)
Weighted Average Common Shares - Basic	269,361,100	290,429,500
Dilution for Assumed Exercises of Stock Options and Nonvested Stock Awards	993,300	854,500
Weighted Average Common Shares - Assuming Dilution	270,354,400	291,284,000
Net Income Per Common Share
Earnings Per Share, Basic	$ 0.79	$ 0.74
Earnings Per Share, Diluted	$ 0.79	$ 0.73
Retained Earnings [Member]
Numerator
Net Income	$ 212.6	$ 213.9

XML

Fair Value of Financial Instruments Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying amount of policy loans	$ 3,141.4		$ 3,133.8
Long-term Debt	2,673.9		2,755.4
Embedded Derivative, Gain (Loss) on Embedded Derivative, Net	6.4	12.3
Other Than Fair Value Inputs Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Percentage of Total Fair Value of Fixed Maturities Securities	90.50%
Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term Debt	1,241.2		1,212.0
Fair Value, Inputs, Level 1 [Member] | Pricing Service [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Percentage of Total Fair Value of Fixed Maturities Securities	9.50%
Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term Debt	1,713.7		1,756.8
Fair Value, Inputs, Level 2 [Member] | Pricing Service [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Percentage of Total Fair Value of Fixed Maturities Securities	73.40%
Fair Value, Inputs, Level 2 [Member] | Other Observable Market Data
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Percentage of Total Fair Value of Fixed Maturities Securities	3.40%
Fair Value Inputs Level 2 Or Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Percentage of Total Fair Value of Fixed Maturities Securities	13.70%
Ceded Policy Loans [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying amount of policy loans	$ 2,919.8		$ 2,912.7

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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, 2013		Mar. 31, 2012
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in OCI on Derivatives (Effective Portion)	$ 1.9		$ 15.4
Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	1.2		(3.8)
Interest Rate Swap [Member] | Net Investment Income
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in OCI on Derivatives (Effective Portion)	(2.2)		18.3
Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	10.0	[1]	9.1	[1]
Interest Rate Swap [Member] | Net Realized Investments Gain Loss [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in OCI on Derivatives (Effective Portion)			0
Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)			0.1	[2]
Interest Rate Swap [Member] | Interest and Debt Expenses [Member]
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)	[3]
Foreign Exchange Contract [Member] | 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)	(1.7)	[1]	(0.2)	[1]
Foreign Exchange Contract [Member] | Net Realized Investments Gain Loss [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in OCI on Derivatives (Effective Portion)	4.1		(2.9)
Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	$ (6.7)	[2]	$ (12.4)	[2]

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

[2] (2)Loss recognized in net realized investment gain

[3] (3)Loss recognized in interest and debt expense

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Signficant Accounting Policies (Policies)

3 Months Ended

Mar. 31, 2013

Significant Accounting Policies [Abstract]

Accounting Changes and Error Corrections

Accounting Updates Adopted in 2013:

Accounting Standards Codification (ASC) 210 "Balance Sheet - Disclosures about Offsetting Assets and Liabilities"

In December 2011, the Financial Accounting Standards Board (FASB) issued an update requiring 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 provide information about the effect or potential effect of netting arrangements on an entity's financial position, including the effect or potential effect of rights of set-off associated with certain financial instruments and derivative instruments. In January 2013, the FASB issued an update to clarify the scope of transactions that are subject to the disclosures about offsetting. Specifically, the update applies only to derivatives, repurchase agreements and reverse repurchase agreements, and securities borrowing and securities lending transactions to the extent they are subject to a master netting arrangement or similar agreement. We adopted these updates effective January 1, 2013. The adoption of these updates expanded our disclosures but had no effect on our financial position or results of operations.

ASC 220 "Comprehensive Income"

In February 2013, the FASB issued an update to improve the transparency of reporting reclassifications out of accumulated other comprehensive income by requiring additional information to be presented regarding certain reclassification adjustments. We adopted this update effective January 1, 2013. The adoption of this update expanded our disclosures but had no effect on our financial position or results of operations.

Accounting Updates Adopted in 2012:

ASC 220 "Comprehensive Income"

In June 2011, the 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. 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.

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Segment Information (Tables)

3 Months Ended

Mar. 31, 2013

Segment Reporting [Abstract]

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
	2013			2012
	(in millions of dollars)
Unum US
Group Disability
Group Long-term Disability	$	392.7		$	395.5
Group Short-term Disability	131.0			117.7
Group Life and Accidental Death & Dismemberment
Group Life	302.2			293.6
Accidental Death & Dismemberment	30.9			28.3
Supplemental and Voluntary
Individual Disability - Recently Issued	120.1			118.4
Voluntary Benefits	162.8			158.5
	1,139.7			1,112.0
Unum UK
Group Long-term Disability	97.9			101.9
Group Life	31.0			52.7
Supplemental and Voluntary	14.9			16.1
	143.8			170.7
Colonial Life
Accident, Sickness, and Disability	184.8			180.2
Life	54.8			51.7
Cancer and Critical Illness	67.5			64.4
	307.1			296.3
Closed Block
Individual Disability	181.8			187.2
Long-term Care	158.8			155.2
All Other	(0.3		)	0.5
	340.3			342.9
Total	$	1,930.9		$	1,921.9

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, 2013
Premium Income	$	1,139.7	$	143.8	$	307.1	$	340.3	$	—		$	1,930.9
Net Investment Income	235.7		30.8		39.7		313.1		1.8			621.1
Other Income	36.7		0.1		—		24.1		1.6			62.5
Operating Revenue	$	1,412.1	$	174.7	$	346.8	$	677.5	$	3.4		$	2,614.5
Operating Income (Loss)	$	208.1	$	31.3	$	75.4	$	27.3	$	(33.7	)	$	308.4
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

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
	2013			2012
	(in millions of dollars)
Operating Revenue by Segment	$	2,614.5		$	2,598.9
Net Realized Investment Gain	10.3			12.4
Total Revenue	$	2,624.8		$	2,611.3
Operating Income by Segment	$	308.4		$	309.2
Net Realized Investment Gain	10.3			12.4
Non-operating Retirement-related Loss	(14.9		)	(11.6		)
Income Tax	(91.2		)	(96.1		)
Net Income	$	212.6		$	213.9

Assets by Segment

Assets by segment are as follows:

	March 31		December 31
	2013		2012
	(in millions of dollars)
Unum US	$	19,097.5	$	19,391.2
Unum UK	3,664.8		3,975.8
Colonial Life	3,438.8		3,434.9
Closed Block	32,885.5		33,069.2
Corporate	2,524.8		2,365.0
Total	$	61,611.4	$	62,236.1

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Timing of Anticipated Settlements of Interest Rate Swaps Outstanding (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2012	Dec. 31, 2011
Derivative [Line Items]
Notional Value	$ 1,444.8	$ 1,432.8	$ 1,364.1	$ 1,413.0
Forecasted in 2013 [Member]
Derivative [Line Items]
Notional Value	$ 110.0
Weighted Average Receive Rate	6.71%
Weighted Average pay rate	0.28%

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Mortgage Loans, Sorted by Applicable Credit Quality Indicators, Loan to Value Ratio (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans	$ 1,730.4	$ 1,712.7
Loan to Value Ratio Below or Equal to 65 Percent
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans	657.8	624.7
Loan To Value Ratio Above 65 To 75 Percent
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans	847.3	858.8
Loan To Value Ratio Above 75 To 85 Percent
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans	131.5	142.5
Loan To Value Ratio Above 85 Percent
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans	$ 93.8	$ 86.7

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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Net Income	$ 212.6	$ 213.9
Other Comprehensive Income (Loss)
Change in Net Unrealized Gain on Securities Before Adjustment (net of tax benefit of $159.4; $110.5)	(278.5)	(197.2)
Change in Adjustment to Deferred Acquisition Costs and Reserves for Future Policy and Contract Benefits, Net of Reinsurance (net of tax expense of $108.6; $97.2)	197.4	166.8
Change in Net Gain on Cash Flow Hedges (net of tax benefit of $0.2; $5.9)	(2.0)	(10.7)
Change in Foreign Currency Translation Adjustment	(69.9)	28.2
Change in Unrecognized Pension and Postretirement Benefit Costs (net of tax expense of $5.5; $3.5)	10.7	6.5
Total Other Comprehensive Loss	(142.3)	(6.4)
Comprehensive Income	$ 70.3	$ 207.5

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Basis of Presentation Basis of Presentation

3 Months Ended

Mar. 31, 2013

Basis of Presentation [Abstract]

Basis of Accounting

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, 2012.

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.

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Selected Operating Statement Data by Segment (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Segment Reporting Information [Line Items]
Premium Income	$ 1,930.9	$ 1,921.9
Net Investment Income	621.1	619.5
Other Income	62.5	57.5
Operating Revenue	2,614.5	2,598.9
Operating Income (Loss)	308.4	309.2
Unum U.S.
Segment Reporting Information [Line Items]
Premium Income	1,139.7	1,112.0
Net Investment Income	235.7	238.6
Other Income	36.7	31.1
Operating Revenue	1,412.1	1,381.7
Operating Income (Loss)	208.1	205.9
Unum U.K.
Segment Reporting Information [Line Items]
Premium Income	143.8	170.7
Net Investment Income	30.8	36.5
Other Income	0.1	0.1
Operating Revenue	174.7	207.3
Operating Income (Loss)	31.3	38.8
Colonial Life
Segment Reporting Information [Line Items]
Premium Income	307.1	296.3
Net Investment Income	39.7	35.6
Other Income	0	0.1
Operating Revenue	346.8	332.0
Operating Income (Loss)	75.4	69.7
Closed Block
Segment Reporting Information [Line Items]
Premium Income	340.3	342.9
Net Investment Income	313.1	301.6
Other Income	24.1	25.9
Operating Revenue	677.5	670.4
Operating Income (Loss)	27.3	15.4
Corporate
Segment Reporting Information [Line Items]
Net Investment Income	1.8	7.2
Other Income	1.6	0.3
Operating Revenue	3.4	7.5
Operating Income (Loss)	$ (33.7)	$ (20.6)

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Pensions and Other Postretirement Benefits (Tables)

3 Months Ended

Mar. 31, 2013

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

Schedule of Net Benefit Costs [Table Text Block]

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

	Three Months Ended March 31
	Pension Benefits
	U.S. Plans						Non U.S. Plans						OPEB
	2013			2012			2013			2012			2013			2012
	(in millions of dollars)
Service Cost	$	14.9		$	12.2		$	1.1		$	1.2		$	0.2		$	0.4
Interest Cost	21.9			21.1			2.1			2.1			2.0			2.4
Expected Return on Plan Assets	(25.5		)	(22.2		)	(3.0		)	(2.7		)	(0.2		)	(0.2		)
Amortization of:
Net Actuarial Loss	14.6			11.5			0.3			0.1			—			—
Prior Service Credit	—			(0.1		)	—			—			(1.2		)	(0.6		)
Total	$	25.9		$	22.5		$	0.5		$	0.7		$	0.8		$	2.0

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Mortgage Loans by Property Type (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans	$ 1,730.4	$ 1,712.7
Percent of Total	100.00%	100.00%
Apartment
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans	33.8	34.0
Percent of Total	2.00%	2.00%
Industrial
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans	518.0	513.4
Percent of Total	29.90%	30.00%
Mixed
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans	77.8	78.4
Percent of Total	4.50%	4.60%
Office
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans	730.6	713.4
Percent of Total	42.20%	41.60%
Retail
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans	$ 370.2	$ 373.5
Percent of Total	21.40%	21.80%

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Debt

3 Months Ended

Mar. 31, 2013

Debt Disclosure [Abstract]

Debt Disclosure [Text Block]

Short-term debt at March 31, 2013 consisted entirely of securities lending transactions.

During the three months ended March 31, 2013, we made principal payments of $15.0 million on our senior secured notes issued by Northwind Holdings, LLC.

In January 2013, we purchased and retired the outstanding principal of $62.5 million on our senior secured notes issued by Tailwind Holdings, LLC, resulting in a before-tax gain of $4.0 million.