10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D. C. 20549

FORM 10-Q

(Mark One)

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

For the quarterly period ended September 30, 2011

¨ 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

292,380,426 shares of the registrant’s common stock were outstanding as of October 31, 2011.

TABLE OF CONTENTS

		Page
	Cautionary Statement Regarding Forward-Looking Statements	1
	PART I
1.	Financial Statements (Unaudited):
	Consolidated Balance Sheets at September 30, 2011 and December 31, 2010	2
	Consolidated Statements of Income for the three and nine months ended September 30, 2011 and 2010	4
	Consolidated Statements of Stockholders’ Equity for the nine months ended September 30, 2011 and 2010	5
	Consolidated Statements of Cash Flows for the nine months ended September 30, 2011 and 2010	6
	Consolidated Statements of Comprehensive Income for the three and nine months ended September 30, 2011 and 2010	7
	Notes to Consolidated Financial Statements	8
	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	81
4.	Controls and Procedures	81
	PART II
1.	Legal Proceedings	82
1A.	Risk Factors	82
2.	Unregistered Sales of Equity Securities and Use of Proceeds	82
6.	Exhibits	83
	Signatures	84

Cautionary Statement Regarding Forward-Looking Statements

The Private Securities Litigation Reform Act of 1995 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. Forward-looking statements are those not based on historical information, but rather relate to future operations, strategies, financial results, or other developments and speak only as of the date made. We undertake no obligation to update these statements, even if made available on our website or otherwise. These statements may be made directly in this document or may be made part of this document by reference to other documents filed by us with the SEC, a practice which is known as “incorporation by reference.” You can find many of these statements by looking for words such as “will,” “may,” “should,” “could,” “believes,” “expects,” “anticipates,” “estimates,” “intends,” “projects,” “goals,” “objectives,” or similar expressions in this document or in documents incorporated herein.

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

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

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

• Sustained periods of low interest rates.

• Changes in claim incidence, recovery rates, and offsets due to, among other factors, the rate of unemployment and consumer confidence, the emergence of new diseases, epidemics, or pandemics, new trends and developments in medical treatments, the effectiveness of claims management operations, and changes in government programs.

• Fluctuation in insurance reserve liabilities.

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

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

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

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

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

• Changes in accounting standards, practices, or policies.

• Changes in our financial strength and credit ratings.

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

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

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

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

• Effectiveness of our risk management program.

• The level and results of litigation.

• Currency exchange rates.

• Ability of our subsidiaries to pay dividends as a result of regulatory restrictions.

• Ability and willingness of reinsurers to meet their obligations.

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

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

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

For further discussion of risks and uncertainties which could cause actual results to differ from those contained in the forward-looking statements, see Part I, Item 1A of our annual report on Form 10-K for the year ended December 31, 2010.

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

	September 30 2011		December 31 2010
	(in millions of dollars)
	(Unaudited)
Assets
Investments
Fixed Maturity Securities - at fair value (amortized cost: $36,746.7; $36,546.6)	$	42,434.7	$	40,035.6
Mortgage Loans	1,606.9		1,516.8
Policy Loans	3,075.1		2,996.1
Other Long-term Investments	611.1		529.3
Short-term Investments	1,035.9		1,163.1
Total Investments	48,763.7		46,240.9
Other Assets
Cash and Bank Deposits	52.2		53.6
Accounts and Premiums Receivable	1,680.4		1,665.8
Reinsurance Recoverable	4,923.1		4,827.9
Accrued Investment Income	695.5		669.8
Deferred Acquisition Costs	2,572.4		2,521.1
Goodwill	201.2		201.2
Property and Equipment	492.1		476.8
Other Assets	660.3		650.6
Total Assets	$	60,040.9	$	57,307.7

See notes to consolidated financial statements.

2

CONSOLIDATED BALANCE SHEETS - Continued

Unum Group and Subsidiaries

	September 30 2011			December 31 2010
	(in millions of dollars)
	(Unaudited)
Liabilities and Stockholders’ Equity
Liabilities
Policy and Contract Benefits	$	1,517.5		$	1,565.0
Reserves for Future Policy and Contract Benefits	41,633.4			39,715.0
Unearned Premiums	493.5			436.7
Other Policyholders’ Funds	1,603.5			1,669.7
Income Tax Payable	82.6			135.7
Deferred Income Tax	795.3			417.2
Short-term Debt	342.4			225.1
Long-term Debt	2,586.5			2,631.3
Other Liabilities	1,526.1			1,567.6
Total Liabilities	50,580.8			48,363.3
Commitments and Contingent Liabilities - Note 9
Stockholders’ Equity
Common Stock, $0.10 par
Authorized: 725,000,000 shares
Issued: 358,312,558 and 364,842,919 shares	35.8			36.5
Additional Paid-in Capital	2,580.9			2,615.4
Accumulated Other Comprehensive Income (Loss)
Net Unrealized Gain on Securities Not Other-Than-Temporarily Impaired	885.6			408.3
Net Unrealized Gain on Securities Other-Than-Temporarily Impaired	—			2.1
Net Gain on Cash Flow Hedges	421.1			361.0
Foreign Currency Translation Adjustment	(116.9		)	(110.9		)
Unrecognized Pension and Postretirement Benefit Costs	(303.6		)	(318.6		)
Retained Earnings	7,487.3			7,060.8
Treasury Stock - at cost: 65,975,613 and 48,269,467 shares	(1,530.1		)	(1,110.2		)
Total Stockholders’ Equity	9,460.1			8,944.4
Total Liabilities and Stockholders’ Equity	$	60,040.9		$	57,307.7

See notes to consolidated financial statements.

3

CONSOLIDATED STATEMENTS OF INCOME (UNAUDITED)

Unum Group and Subsidiaries

	Three Months Ended September 30						Nine Months Ended September 30
	2011			2010			2011			2010
	(in millions of dollars, except share data)
Revenue
Premium Income	$	1,881.2		$	1,850.2		$	5,625.7		$	5,563.2
Net Investment Income	629.2			618.4			1,885.0			1,861.2
Realized Investment Gain (Loss)
Total Other-Than-Temporary Impairment Loss on Fixed Maturity Securities	(1.2		)	—			(4.2		)	(10.4		)
Other Net Realized Investment Gain (Loss)	(22.7		)	1.1			(8.1		)	7.6
Net Realized Investment Gain (Loss)	(23.9		)	1.1			(12.3		)	(2.8		)
Other Income	59.1			58.2			174.8			178.5
Total Revenue	2,545.6			2,527.9			7,673.2			7,600.1
Benefits and Expenses
Benefits and Change in Reserves for Future Benefits	1,635.6			1,587.5			4,828.0			4,736.0
Commissions	220.5			214.0			662.7			640.1
Interest and Debt Expense	35.1			35.2			108.1			102.7
Deferral of Acquisition Costs	(155.6		)	(150.9		)	(472.1		)	(455.5		)
Amortization of Deferred Acquisition Costs	125.2			130.6			400.4			407.7
Compensation Expense	198.3			194.1			598.9			582.8
Other Expenses	193.2			190.9			585.7			590.5
Total Benefits and Expenses	2,252.3			2,201.4			6,711.7			6,604.3
Income Before Income Tax	293.3			326.5			961.5			995.8
Income Tax
Current	54.4			80.6			210.7			250.7
Deferred	33.3			25.1			90.0			84.8
Total Income Tax	87.7			105.7			300.7			335.5
Net Income	$	205.6		$	220.8		$	660.8		$	660.3
Net Income Per Common Share
Basic	$	0.69		$	0.68		$	2.16		$	2.01
Assuming Dilution	$	0.69		$	0.68		$	2.15		$	2.00

See notes to consolidated financial statements.

4

CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY (UNAUDITED)

Unum Group and Subsidiaries

	Nine Months Ended September 30
	2011			2010
	(in millions of dollars)
Common Stock
Balance at Beginning of Year	$	36.5		$	36.4
Common Stock Activity	0.1			0.1
Retirement of Repurchased Common Shares	(0.8		)	—
Balance at End of Period	35.8			36.5
Additional Paid-in Capital
Balance at Beginning of Year	2,615.4			2,587.4
Common Stock Activity	20.7			23.7
Retirement of Repurchased Common Shares	(55.2		)	—
Balance at End of Period	2,580.9			2,611.1
Accumulated Other Comprehensive Income
Balance at Beginning of Year	341.9			341.0
Change During Period	544.3			152.8
Balance at End of Period	886.2			493.8
Retained Earnings
Balance at Beginning of Year	7,060.8			6,289.5
Net Income	660.8			660.3
Dividends to Stockholders (per common share: $0.2900; $0.2575)	(90.3		)	(85.4		)
Retirement of Repurchased Common Shares	(144.0		)	—
Balance at End of Period	7,487.3			6,864.4
Treasury Stock
Balance at Beginning of Year	(1,110.2		)	(754.2		)
Purchases of Treasury Stock	(419.9		)	(327.5		)
Balance at End of Period	(1,530.1		)	(1,081.7		)
Total Stockholders’ Equity at End of Period	$	9,460.1		$	8,924.1

See notes to consolidated financial statements.

5

CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED)

Unum Group and Subsidiaries

	Nine Months Ended September 30
	2011			2010
	(in millions of dollars)
Cash Flows from Operating Activities
Net Income	$	660.8		$	660.3
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities
Change in Receivables	(45.8		)	(44.1		)
Change in Deferred Acquisition Costs	(71.7		)	(47.8		)
Change in Insurance Reserves and Liabilities	321.7			440.4
Change in Income Taxes	41.2			124.5
Change in Other Accrued Liabilities	12.4			(35.9		)
Non-cash Adjustments to Net Investment Income	(206.6		)	(225.6		)
Net Realized Investment Loss	12.3			2.8
Depreciation	60.2			56.1
Other, Net	4.2			(16.9		)
Net Cash Provided by Operating Activities	788.7			913.8
Cash Flows from Investing Activities
Proceeds from Sales of Available-for-Sale Securities	908.8			723.9
Proceeds from Maturities of Available-for-Sale Securities	1,235.0			1,682.4
Proceeds from Sales and Maturities of Other Investments	101.3			102.3
Purchase of Available-for-Sale Securities	(2,162.2		)	(2,958.7		)
Purchase of Other Investments	(234.3		)	(222.1		)
Net Sales (Purchases) of Short-term Investments	86.3			(70.3		)
Other, Net	(75.9		)	(100.4		)
Net Cash Used by Investing Activities	(141.0		)	(842.9		)
Cash Flows from Financing Activities
Net Short-term Debt Borrowings	117.3			—
Issuance of Long-term Debt	—			396.9
Long-term Debt Repayments	(66.9		)	(62.7		)
Issuance of Common Stock	7.6			9.4
Repurchase of Common Stock	(619.9		)	(324.0		)
Dividends Paid to Stockholders	(90.3		)	(85.4		)
Other, Net	3.2			1.9
Net Cash Used by Financing Activities	(649.0		)	(63.9		)
Effect of Foreign Exchange Rate Changes on Cash	(0.1		)	—
Net Increase (Decrease) in Cash and Bank Deposits	(1.4		)	7.0
Cash and Bank Deposits at Beginning of Year	53.6			71.6
Cash and Bank Deposits at End of Period	$	52.2		$	78.6

See notes to consolidated financial statements.

6

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED)

Unum Group and Subsidiaries

	Three Months Ended September 30						Nine Months Ended September 30
	2011			2010			2011			2010
	(in millions of dollars)
Net Income	$	205.6		$	220.8		$	660.8		$	660.3
Other Comprehensive Income (Loss)
Change in Net Unrealized Gains on Securities Before Reclassification Adjustment:
Change in Net Unrealized Gains on Securities Not Other-Than-Temporarily Impaired (net of tax expense of $599.6; $474.7; $754.9; $1,071.9)	1,124.5			906.2			1,419.0			2,035.3
Change in Net Unrealized Gains on Securities Other-Than-Temporarily Impaired (net of tax expense (benefit) of $ - ; $0.5; $(1.1); $ - )	—			1.0			(2.1		)	0.1
Total Change in Net Unrealized Gains on Securities Before Reclassification Adjustment (net of tax expense of $599.6; $475.2; $753.8; $1,071.9)	1,124.5			907.2			1,416.9			2,035.4
Reclassification Adjustment for Net Realized Investment Gain (net of tax expense of $3.4; $0.4; $4.6; $1.1)	(5.3		)	(1.5		)	(7.7		)	(3.3		)
Change in Net Gain on Cash Flow Hedges (net of tax expense (benefit) of $34.7; $(6.0); $32.0; $22.9)	65.2			(11.7		)	60.1			42.2
Change in Adjustment to Reserves for Future Policy and Contract Benefits, Net of Reinsurance and Other (net of tax benefit of $378.5; $472.6; $500.2; $1,015.6)	(705.3		)	(894.2		)	(934.0		)	(1,923.8		)
Change in Foreign Currency Translation Adjustment (net of tax expense of $ - ; $0.6; $ - ; $0.6)	(34.1		)	53.3			(6.0		)	(24.7		)
Change in Unrecognized Pension and Postretirement Benefit Costs (net of tax expense (benefit) of $2.8; $1.9; $6.9; $(3.6))	5.2			2.8			15.0			27.0
Total Other Comprehensive Income	450.2			55.9			544.3			152.8
Comprehensive Income	$	655.8		$	276.7		$	1,205.1		$	813.1

See notes to consolidated financial statements.

7

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED)

Unum Group and Subsidiaries

September 30, 2011

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, 2010.

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

In connection with our preparation of the consolidated financial statements, we evaluated events that occurred subsequent to September 30, 2011 for recognition or disclosure in our financial statements and notes to our financial statements.

Note 2 - Accounting Developments

Accounting Updates Adopted during the First Nine Months of 2011:

Accounting Standards Codification (ASC) 310 “Receivables”

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

Accounting Updates Adopted during the First Nine Months of 2010:

ASC 810 “Consolidation”

In June 2009, the FASB issued an update to require a qualitative rather than a quantitative analysis to determine the primary beneficiary of a variable interest entity and require enhanced disclosures about an enterprise's involvement with a variable interest entity. We adopted this update effective January 1, 2010. The adoption of this update had no effect on our financial position or results of operations. 

ASC 820 “Fair Value Measurements and Disclosures”

In January 2010, the FASB issued an update to require a number of additional disclosures regarding fair value measurements. Specifically, the update requires a reporting entity to disclose the amounts of significant transfers between Level 1 and Level 2 of the three tier fair value hierarchy and the reasons for these transfers, as well as the reasons for any transfers in or out of Level 3, effective for annual and interim periods beginning after December 15, 2009. The update also requires information in the reconciliation of recurring Level 3 measurements about purchases, sales, issuances, and settlements on a gross basis, effective for annual and interim periods beginning after December 15, 2010. We adopted this update in its entirety, including early adoption of the additional Level 3 information, effective January 1, 2010. 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 June 2009, the FASB issued an update to eliminate the exceptions for qualifying special-purpose entities from the consolidation guidance and eliminate the exception that permitted sale accounting for certain mortgage securitizations when a transferor has not surrendered control over the transferred financial assets. In addition, this update clarifies certain requirements for financial assets that are eligible for sale accounting and requires enhanced disclosures about the risks that a transferor continues to be exposed to because of its continuing involvement in transferred financial assets. We adopted this update effective January 1, 2010. The adoption of this update had no effect on our financial position or results of operations.

8

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2011

Note 2 - Accounting Developments - Continued

Accounting Updates Outstanding:

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 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. The amendments in this update shall be applied retrospectively and are effective for interim and annual periods beginning after December 15, 2011. In October 2011, the FASB tentatively decided to issue an exposure draft to delay the effective date of the presentation requirements for reclassification adjustments to give the FASB time to address concerns expressed by registrants about applying the presentation requirements contained within the update. The adoption of this update will modify our financial statement presentation but will have 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 would not be 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. The amendments in this update are effective for goodwill impairment tests performed for interim and annual periods beginning after December 15, 2011. The adoption of this update will have 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. The amendments in this update are effective for interim and annual periods beginning after December 15, 2011. The adoption of this update will expand our disclosures but will have 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. This update will be effective for interim and annual reporting periods beginning on or after December 15, 2011 and early adoption is prohibited. The adoption of this update will have no effect on our financial position or results of operations.

ASC 944 “Financial Services - Insurance”

In October 2010, the FASB issued an update which is intended 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 modify the existing guidance and 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.

9

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2011

Note 2 - Accounting Developments - Continued

The amendments in the update are effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2011 and permit retrospective application.

Our expected retrospective adoption of this update will result in a reduction in our deferred acquisition cost asset as well as a decrease in the amortization associated with those previously deferred costs. There will also be a reduction in the level of costs we defer subsequent to adoption. 

We are evaluating the full effects of implementing this update, but we currently estimate that our retrospective adoption will result in a cumulative effect adjustment to the opening balance of retained earnings of between $400.0 million and $600.0 million in the year of adoption.  We currently estimate the adoption of this update will result in an immaterial decrease in net income in 2012 and in the years preceding to which the retrospective adoption will be applied. 

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, and accrued investment income approximate fair value due to the short-term nature of the instruments. As such, these financial instruments are not included in the following chart.

	September 30, 2011				December 31, 2010
	Carrying Amount		Fair Value		Carrying Amount		Fair Value
	(in millions of dollars)
Assets
Fixed Maturity Securities	$	42,434.7	$	42,434.7	$	40,035.6	$	40,035.6
Mortgage Loans	1,606.9		1,789.9		1,516.8		1,685.4
Policy Loans	3,075.1		3,146.0		2,996.1		3,044.4
Other Long-term Investments
Derivatives	143.2		143.2		99.1		99.1
Equity Securities	10.4		10.4		10.4		10.4
Miscellaneous Long-term Investments	457.5		457.5		419.8		419.8
Liabilities
Policyholders’ Funds
Deferred Annuity Products	$	642.5	$	642.5	$	656.3	$	656.3
Supplementary Contracts without Life Contingencies	491.8		491.8		508.5		508.5
Short-term Debt	342.4		342.4		225.1		226.8
Long-term Debt	2,586.5		2,589.9		2,631.3		2,483.8
Other Liabilities
Derivatives	154.7		154.7		199.6		199.6
Embedded Derivative in Modified Coinsurance Arrangement	120.7		120.7		96.3		96.3
Unfunded Commitments to Investment Partnerships	158.6		158.6		169.9		169.9

10

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2011

Note 3 - Fair Values of Financial Instruments - Continued

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

Fair Value Measurements for Financial Instruments Not Carried at Fair Value

Mortgage Loans: Fair values are estimated using discounted cash flow analyses and interest rates currently being offered for similar loans to borrowers with similar credit ratings and maturities. Loans with similar characteristics are aggregated for purposes of the calculations.

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. The carrying amounts of ceded policy loans of $2,864.0 million and $2,790.5 million as of September 30, 2011 and December 31, 2010, respectively, are reported on a gross basis in our consolidated balance sheets and approximate fair value.

Miscellaneous Long-term Investments: Carrying amounts approximate fair value.

Policyholders’ Funds: Policyholders' funds are comprised primarily of deferred annuity products and supplementary contracts without life contingencies. The carrying amounts approximate fair value.

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 minimizes exposure to changing interest rates through the matching of investment maturities with amounts due under insurance contracts.

Short-term and Long-term Debt: Fair values for short-term and long-term debt other than securities lending transactions are obtained from independent pricing services or discounted cash flow analyses based on current incremental borrowing rates for similar types of borrowing arrangements. Carrying amounts for outstanding securities lending transactions approximate fair value.

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.

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.

11

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2011

Note 3 - Fair Values of Financial Instruments - Continued

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 markets are less active, brokers may rely more on models with inputs based on the information available only to the broker. 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 2011, we have applied valuation techniques on a consistent basis to similar assets and liabilities and consistent with those techniques used at year end 2010.

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

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.  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.

12

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2011

Note 3 - Fair Values of Financial Instruments - Continued

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 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. In regard to our own credit risk component, we adjust the valuation of derivative liabilities wherein the counterparty is exposed to our credit risk when the LIBOR-based valuation of our derivatives obtained from pricing sources does not effectively include an adequate credit component for our own credit risk.

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

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

At September 30, 2011, approximately 15.7 percent of our fixed maturity securities were valued using active trades from TRACE pricing or broker market maker prices for which there was current market activity in that specific security (comparable to receiving one binding quote).  The prices obtained were not adjusted, and the assets were classified as Level 1, the highest category of the three-level fair value hierarchy classification wherein inputs are unadjusted and represent quoted prices in active markets for identical assets or liabilities.

The remaining 84.3 percent of our fixed maturity securities were valued based on non-binding quotes or other observable or unobservable inputs, as discussed below.

• Approximately 68.7 percent of our fixed maturity securities were valued based on prices from pricing services that generally use observable inputs such as prices for securities or comparable securities in active markets in their valuation techniques. These assets were classified as Level 2. Level 2 assets or liabilities are those valued using inputs (other than prices included in Level 1) that are either directly or indirectly observable for the asset or liability through correlation with market data at the measurement date and for the duration of the instrument’s anticipated life.

• Approximately 4.4 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.

13

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2011

Note 3 - Fair Values of Financial Instruments - Continued

• Approximately 11.2 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.

The categorization of fair value measurements by input level is as follows:

	September 30, 2011
	(in millions of dollars)
	Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
Assets
Fixed Maturity Securities
United States Government and Government Agencies and Authorities	$	324.7	$	968.9	$	—	$	1,293.6
States, Municipalities, and Political Subdivisions	31.5		1,554.9		—		1,586.4
Foreign Governments	—		1,474.7		—		1,474.7
Public Utilities	1,131.4		8,973.5		395.8		10,500.7
Mortgage/Asset-Backed Securities	—		3,127.4		19.6		3,147.0
All Other Corporate Bonds	5,183.6		18,725.4		466.8		24,375.8
Redeemable Preferred Stocks	—		34.8		21.7		56.5
Total Fixed Maturity Securities	6,671.2		34,859.6		903.9		42,434.7
Other Long-term Investments
Derivatives
Interest Rate Swaps and Forwards	—		140.8		—		140.8
Foreign Exchange Contracts	—		2.4		—		2.4
Total Derivatives	—		143.2		—		143.2
Equity Securities	—		—		10.4		10.4
Liabilities
Other Liabilities
Derivatives
Interest Rate Swaps	$	—	$	33.5	$	—	$	33.5
Foreign Exchange Contracts	—		121.2		—		121.2
Embedded Derivative in Modified Coinsurance Arrangement	—		—		120.7		120.7
Total Derivatives	—		154.7		120.7		275.4

14

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2011

Note 3 - Fair Values of Financial Instruments - Continued

	December 31, 2010
	(in millions of dollars)
	Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
Assets
Fixed Maturity Securities
United States Government and Government Agencies and Authorities	$	102.8	$	998.9	$	—	$	1,101.7
States, Municipalities, and Political Subdivisions	301.9		943.3		—		1,245.2
Foreign Governments	0.7		1,408.6		—		1,409.3
Public Utilities	840.1		8,670.5		173.6		9,684.2
Mortgage/Asset-Backed Securities	—		3,384.8		0.7		3,385.5
All Other Corporate Bonds	4,170.7		18,154.3		829.7		23,154.7
Redeemable Preferred Stocks	—		33.3		21.7		55.0
Total Fixed Maturity Securities	5,416.2		33,593.7		1,025.7		40,035.6
Other Long-term Investments
Derivatives
Interest Rate Swaps	—		98.4		—		98.4
Foreign Exchange Contracts	—		0.7		—		0.7
Total Derivatives	—		99.1		—		99.1
Equity Securities	—		8.9		1.5		10.4
Liabilities
Other Liabilities
Derivatives
Interest Rate Swaps	$	—	$	39.1	$	—	$	39.1
Foreign Exchange Contracts	—		160.5		—		160.5
Embedded Derivative in Modified Coinsurance Arrangement	—		—		96.3		96.3
Total Derivatives	—		199.6		96.3		295.9

15

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2011

Note 3 - Fair Values of Financial Instruments - Continued

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

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

	Three Months Ended September 30, 2010				Nine Months Ended September 30, 2010
	(in millions of dollars) Transfers into
	Level 1 from Level 2		Level 2 from Level 1		Level 1 from Level 2		Level 2 from Level 1
Fixed Maturity Securities
United States Government and Government Agencies and Authorities	$	17.1	$	20.5	$	110.8	$	—
States, Municipalities, and Political Subdivisions	123.7		40.0		55.4		59.5
Public Utilities	678.9		579.4		616.1		581.0
All Other Corporate Bonds	2,328.7		1,887.6		2,949.3		1,052.4
Redeemable Preferred Stock	—		—		—		5.5
Total Fixed Maturity Securities	$	3,148.4	$	2,527.5	$	3,731.6	$	1,698.4

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

September 30, 2011

Note 3 - Fair Values of Financial Instruments - Continued

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

	Three Months Ended September 30, 2011
	(in millions of dollars)
				Total Realized and Unrealized Investment Gains (Losses) Included in
	Beginning of Period			Earnings			Other Comprehensive Income or Loss			Purchases		Sales			Level 3 Transfers					End of Period
															Into		Out of
Fixed Maturity Securities
Public Utilities	$	217.9		$	0.1		$	9.3		$	30.0	$	(11.9	)	$	220.2	$	(69.8	)	$	395.8
Mortgage/Asset-Backed Securities	19.7			—			(0.1		)	—		—			—		—			19.6
All Other Corporate Bonds	528.3			—			1.3			—		(17.6		)	119.6		(164.8		)	466.8
Redeemable Preferred Stocks	22.6			—			(0.9		)	—		—			—		—			21.7
Total Fixed Maturity Securities	788.5			0.1			9.6			30.0		(29.5		)	339.8		(234.6		)	903.9
Equity Securities	3.6			(0.4		)	(2.4		)	—		—			9.6		—			10.4
Embedded Derivative in Modified Coinsurance Arrangement	(87.0		)	(33.7		)	—			—		—			—		—			(120.7		)
	Three Months Ended September 30, 2010
	(in millions of dollars)
				Total Realized and Unrealized Investment Gains Included in
	Beginning of Period			Earnings			Other Comprehensive Income or Loss			Purchases		Sales			Level 3 Transfers					End of Period
															Into		Out of
Fixed Maturity Securities
States, Municipalities, and Political Subdivisions	$	—		$	—		$	0.5		$	17.7	$	—		$	—	$	—		$	18.2
Public Utilities	72.4			—			6.8			—		(1.3		)	108.0		(28.0		)	157.9
Mortgage/Asset-Backed Securities	1.5			—			—			—		(0.8		)	—		—			0.7
All Other Corporate Bonds	430.1			—			11.1			3.1		(5.3		)	127.7		(44.1		)	522.6
Redeemable Preferred Stocks	21.3			—			—			—		—			—		(21.2		)	0.1
Total Fixed Maturity Securities	525.3			—			18.4			20.8		(7.4		)	235.7		(93.3		)	699.5
Equity Securities	8.9			—			1.8			—		—			—		—			10.7
Embedded Derivative in Modified Coinsurance Arrangement	(122.7		)	1.6			—			—		—			—		—			(121.1		)

17

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2011

Note 3 - Fair Values of Financial Instruments - Continued

	Nine Months Ended September 30, 2011
	(in millions of dollars)
				Total Realized and Unrealized Investment Gains (Losses) Included in
	Beginning of Year			Earnings			Other Comprehensive Income or Loss			Purchases		Sales			Level 3 Transfers					End of Period
															Into		Out of
Fixed Maturity Securities
Public Utilities	$	173.6		$	0.1		$	17.1		$	30.0	$	(15.7	)	$	299.7	$	(109.0	)	$	395.8
Mortgage/Asset-Backed Securities	0.7			—			(0.4		)	19.4		(0.1		)	—		—			19.6
All Other Corporate Bonds	829.7			(2.1		)	4.7			41.7		(32.5		)	96.2		(470.9		)	466.8
Redeemable Preferred Stocks	21.7			—			—			—		—			—		—			21.7
Total Fixed Maturity Securities	1,025.7			(2.0		)	21.4			91.1		(48.3		)	395.9		(579.9		)	903.9
Equity Securities	1.5			(0.4		)	(1.7		)	2.0		—			9.0		—			10.4
Embedded Derivative in Modified Coinsurance Arrangement	(96.3		)	(24.4		)	—			—		—			—		—			(120.7		)
	Nine Months Ended September 30, 2010
	(in millions of dollars)
				Total Realized and Unrealized Investment Gains (Losses) Included in
	Beginning of Year			Earnings			Other Comprehensive Income or Loss			Purchases		Sales			Level 3 Transfers					End of Period
															Into		Out of
Fixed Maturity Securities
States, Municipalities, and Political Subdivisions	$	—		$	—		$	0.5		$	17.7	$	—		$	—	$	—		$	18.2
Public Utilities	264.3			(1.0		)	9.9			—		(8.1		)	112.5		(219.7		)	157.9
Mortgage/Asset-Backed Securities	4.7			—			0.3			—		(4.3		)	—		—			0.7
All Other Corporate Bonds	580.0			(1.8		)	47.5			3.1		(41.8		)	208.6		(273.0		)	522.6
Redeemable Preferred Stocks	20.4			—			—			—		—			—		(20.3		)	0.1
Total Fixed Maturity Securities	869.4			(2.8		)	58.2			20.8		(54.2		)	321.1		(513.0		)	699.5
Equity Securities	1.5			—			2.4			6.9		(0.1		)	—		—			10.7
Embedded Derivative in Modified Coinsurance Arrangement	(117.4		)	(3.7		)	—			—		—			—		—			(121.1		)

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

18

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2011

Note 3 - Fair Values of Financial Instruments - Continued

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. Losses for the three and nine months ended September 30, 2011 which are included in earnings and are attributable to the change in unrealized gains or losses relating to assets or liabilities valued using significant unobservable inputs and still held at the end of that period were $33.7 million and $24.4 million, respectively. Gains (losses) for the three and nine months ended September 30, 2010 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 the end of that period were $1.6 million and $(3.7) 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.

Note 4 - Investments

Fixed Maturity Securities

At September 30, 2011 and December 31, 2010, all fixed maturity securities were classified as available-for-sale. The amortized cost and fair values of securities by security type are shown as follows.

	September 30, 2011
	(in millions of dollars)
	Amortized Cost		Gross Unrealized Gain		Gross Unrealized Loss		Fair Value
United States Government and Government Agencies and Authorities	$	998.8	$	296.0	$	1.2	$	1,293.6
States, Municipalities, and Political Subdivisions	1,360.5		229.0		3.1		1,586.4
Foreign Governments	1,254.3		220.4		—		1,474.7
Public Utilities	8,935.8		1,593.5		28.6		10,500.7
Mortgage/Asset-Backed Securities	2,764.4		386.5		3.9		3,147.0
All Other Corporate Bonds	21,377.1		3,229.8		231.1		24,375.8
Redeemable Preferred Stocks	55.8		2.4		1.7		56.5
Total Fixed Maturity Securities	$	36,746.7	$	5,957.6	$	269.6	$	42,434.7

There were no other-than-temporary impairments recognized in accumulated other comprehensive income as of September 30, 2011.

	December 31, 2010
	(in millions of dollars)
	Amortized Cost		Gross Unrealized Gain		Gross Unrealized Loss		Fair Value		Other-Than- Temporary Impairments in AOCI (1)
United States Government and Government Agencies and Authorities	$	981.7	$	128.6	$	8.6	$	1,101.7	$	—
States, Municipalities, and Political Subdivisions	1,271.0		21.5		47.3		1,245.2		—
Foreign Governments	1,248.6		160.7		—		1,409.3		—
Public Utilities	8,874.2		854.3		44.3		9,684.2		—
Mortgage/Asset-Backed Securities	3,047.8		338.3		0.6		3,385.5		—
All Other Corporate Bonds	21,067.5		2,221.3		134.1		23,154.7		3.9
Redeemable Preferred Stocks	55.8		1.7		2.5		55.0		—
Total Fixed Maturity Securities	$	36,546.6	$	3,726.4	$	237.4	$	40,035.6	$	3.9

(1) Accumulated Other Comprehensive Income (Loss)

19

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2011

Note 4 - Investments - Continued

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

	September 30, 2011
	(in millions of dollars)
	Less Than 12 Months				12 Months or Greater
	Fair Value		Gross Unrealized Loss		Fair Value		Gross Unrealized Loss
United States Government and Government Agencies and Authorities	$	—	$	—	$	6.2	$	1.2
States, Municipalities, and Political Subdivisions	4.8		0.1		89.8		3.0
Public Utilities	211.8		19.7		74.7		8.9
Mortgage/Asset-Backed Securities	95.5		3.1		20.8		0.8
All Other Corporate Bonds	2,315.6		118.8		639.5		112.3
Redeemable Preferred Stocks	—		—		21.1		1.7
Total Fixed Maturity Securities	$	2,627.7	$	141.7	$	852.1	$	127.9

	December 31, 2010
	(in millions of dollars)
	Less Than 12 Months				12 Months or Greater
	Fair Value		Gross Unrealized Loss		Fair Value		Gross Unrealized Loss
United States Government and Government Agencies and Authorities	$	23.9	$	3.1	$	10.9	$	5.5
States, Municipalities, and Political Subdivisions	660.6		28.4		100.3		18.9
Public Utilities	1,073.8		41.0		41.0		3.3
Mortgage/Asset-Backed Securities	34.5		0.1		45.5		0.5
All Other Corporate Bonds	1,667.2		48.3		1,071.7		85.8
Redeemable Preferred Stocks	7.6		0.4		20.7		2.1
Total Fixed Maturity Securities	$	3,467.6	$	121.3	$	1,290.1	$	116.1

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

	September 30, 2011
	(in millions of dollars)
	Total Amortized Cost		Unrealized Gain Position				Unrealized Loss Position
			Gross Gain		Fair Value		Gross Loss		Fair Value
1 year or less	$	669.6	$	13.4	$	636.9	$	0.2	$	45.9
Over 1 year through 5 years	5,061.2		442.7		4,956.9		15.7		531.3
Over 5 years through 10 years	9,563.7		1,191.2		9,257.3		98.5		1,399.1
Over 10 years	18,687.8		3,923.8		21,073.1		151.3		1,387.2
	33,982.3		5,571.1		35,924.2		265.7		3,363.5
Mortgage/Asset-Backed Securities	2,764.4		386.5		3,030.7		3.9		116.3
Total Fixed Maturity Securities	$	36,746.7	$	5,957.6	$	38,954.9	$	269.6	$	3,479.8

20

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2011

Note 4 - Investments - Continued

	December 31, 2010
	(in millions of dollars)
	Total Amortized Cost		Unrealized Gain Position				Unrealized Loss Position
			Gross Gain		Fair Value		Gross Loss		Fair Value
1 year or less	$	685.7	$	10.9	$	532.6	$	0.4	$	163.6
Over 1 year through 5 years	4,740.6		394.1		4,886.3		5.5		242.9
Over 5 years through 10 years	9,501.6		931.6		9,415.0		37.1		981.1
Over 10 years	18,570.9		2,051.5		17,138.5		193.8		3,290.1
	33,498.8		3,388.1		31,972.4		236.8		4,677.7
Mortgage/Asset-Backed Securities	3,047.8		338.3		3,305.5		0.6		80.0
Total Fixed Maturity Securities	$	36,546.6	$	3,726.4	$	35,277.9	$	237.4	$	4,757.7

At September 30, 2011, the fair value of investment-grade fixed maturity securities was $39,732.2 million, with a gross unrealized gain of $5,889.0 million and a gross unrealized loss of $146.0 million. The gross unrealized loss on investment-grade fixed maturity securities was 54.2 percent of the total gross unrealized loss on fixed maturity securities. Unrealized losses on investment-grade fixed maturity securities principally relate to changes in interest rates or changes in market or sector credit spreads which occurred subsequent to the acquisition of the securities.

At September 30, 2011, the fair value of below-investment-grade fixed maturity securities was $2,702.5 million, with a gross unrealized gain of $68.6 million and a gross unrealized loss of $123.6 million. The gross unrealized loss on below-investment-grade fixed maturity securities was 45.8 percent of the total gross unrealized loss on fixed maturity securities. Generally, below-investment-grade fixed maturity securities are more likely to develop credit concerns than investment-grade securities. At September 30, 2011, the unrealized losses in our below-investment-grade fixed maturity securities were generally due to credit spreads in certain industries or sectors and, to a lesser extent, credit concerns related to specific securities. For each specific security in an unrealized loss position, we believe that there are positive factors which mitigate credit concerns and that the securities for which we have not recorded an other-than-temporary impairment will recover in value.

As of September 30, 2011, we held 96 individual investment-grade fixed maturity securities and 82 individual below-investment-grade fixed maturity securities that were in an unrealized loss position, of which 44 investment-grade fixed maturity securities and 23 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

21

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2011

Note 4 - Investments - Continued

We evaluate available information, including the factors noted above, both positive and negative, in reaching our conclusions. In particular, we also consider the strength of the issuer’s balance sheet, its debt obligations and near term funding requirements, cash flow and liquidity, the profitability of its core businesses, the availability of marketable assets which could be sold to increase liquidity, its industry fundamentals and regulatory environment, and its access to capital markets. Although all 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.

22

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2011

Note 4 - Investments - Continued

The following table presents the before-tax credit related portion of other-than-temporary impairments on fixed maturity securities still held as of the dates shown for which a portion of the other-than-temporary impairment was recognized in other comprehensive income.

	Nine Months Ended			Three and Nine Months Ended
	September 30, 2011			September 30, 2010
	(in millions of dollars)
Balance at Beginning of Period	$	8.5		$	18.3
Sales or Maturities of Securities	(8.5		)	—
Balance at End of Period	$	—		$	18.3

There was no activity for the three months ended September 30, 2011 or for the three and nine months ended September 30, 2010.

At September 30, 2011, we had non-binding commitments of $28.7 million to fund private placement fixed maturity securities. 

Variable Interest Entities

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

As of September 30, 2011, the carrying amount of our variable interest entity investments that are not consolidated under the provisions of GAAP was $405.1 million, comprised of $310.2 million of tax credit partnerships and $94.9 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 $158.6 million at September 30, 2011. 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 $57.3 million to fund certain private equity partnerships at September 30, 2011.

We are the sole beneficiary of a special purpose entity which is consolidated under the provisions of GAAP.  This entity is a securitized asset trust containing a highly rated bond for principal protection, nonredeemable preferred stock, and several partnership equity investments.  We contributed the bond and partnership investments into the trust at the time it was established.  The trust supports our investment objectives and allows us to maintain our investment in the partnerships while at the same time protecting the principal of the investment.  There are no restrictions on the assets held in this trust, and the trust is free to dispose of the assets at any time.  Because the assets in the trust are not liquid investments, we periodically provide funding to the underlying partnerships in the trust upon satisfaction of contractual notice from the partnerships.  The fair values of the bond, nonredeemable preferred stock, and partnerships were $122.8 million, $0.1 million, and $8.5 million, respectively, as of September 30, 2011.  The bonds are reported as fixed maturity securities, and the nonredeemable preferred stock and partnerships are reported as other long-term investments in our consolidated balance sheets. At September 30, 2011, we had non-binding commitments to fund approximately $0.5 million to the underlying partnerships.  The amount of funding provided to the partnerships during the three and nine months ended September 30, 2011 and 2010 was de minimis.

23

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2011

Note 4 - Investments - Continued

Mortgage Loans

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

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

	September 30, 2011				December 31, 2010
	Carrying		Percent of		Carrying		Percent of
	Amount		Total		Amount		Total
	(in millions of dollars)
Property Type
Apartment	$	28.1	1.7	%	$	33.7	2.2	%
Industrial	518.2		32.3		458.2		30.2
Mixed	94.1		5.9		95.8		6.3
Office	658.1		41.0		634.7		41.9
Retail	301.2		18.7		286.9		18.9
Other	7.2		0.4		7.5		0.5
Total	$	1,606.9	100.0	%	$	1,516.8	100.0	%

Region
New England	$	148.2	9.2	%	$	146.8	9.7	%
Mid-Atlantic	172.3		10.7		184.8		12.2
East North Central	214.0		13.3		171.7		11.3
West North Central	152.4		9.5		134.6		8.9
South Atlantic	390.5		24.3		372.0		24.5
East South Central	52.7		3.3		26.9		1.8
West South Central	161.9		10.1		171.8		11.3
Mountain	59.2		3.7		60.7		4.0
Pacific	255.7		15.9		247.5		16.3
Total	$	1,606.9	100.0	%	$	1,516.8	100.0	%

24

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2011

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:

	September 30 2011		December 31 2010
	(in millions of dollars)
Internal Rating
Aa	$	18.0	$	19.0
A	702.6		744.4
Baa	842.2		732.9
Ba	31.0		20.5
B	13.1		—
Total	$	1,606.9	$	1,516.8

Loan-to-Value Ratio
<= 65%	$	558.0	$	425.3
> 65% <= 75%	806.4		869.2
> 75% <= 85%	169.7		161.9
> 85% <= 100%	72.8		60.4
Total	$	1,606.9	$	1,516.8

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

25

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2011

Note 4 - Investments - Continued

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

	Three and Nine Months Ended September 30 2011		Three Months Ended September 30 2010		Nine Months Ended September 30 2010
	(in millions of dollars)
Balance at Beginning of Period	$	1.5	$	0.5	$	3.2
Provision	—		0.4		0.9
Charge-offs, Net of Recoveries	—		—		(3.2		)
Balance at End of Period	$	1.5	$	0.9	$	0.9

Impaired mortgage loans are as follows:

	September 30, 2011
	(in millions of dollars)
			Unpaid
	Recorded		Principal		Related
	Investment		Balance		Allowance
With No Related Allowance Recorded	$	19.6	$	19.6	$	—
With an Allowance Recorded	13.1		14.6		1.5
Total	$	32.7	$	34.2	$	1.5
	December 31, 2010
	(in millions of dollars)
			Unpaid
	Recorded		Principal		Related
	Investment		Balance		Allowance
With No Related Allowance Recorded	$	9.8	$	9.8	$	—
With an Allowance Recorded	13.1		14.6		1.5
Total	$	22.9	$	24.4	$	1.5

During the three and nine months ended September 30, 2011, our average investment in impaired mortgage loans was $26.4 million and $20.9 million, respectively. For the three and nine months ended September 30, 2011, we recognized $0.2 million and $0.6 million of interest income, respectively, on mortgage loans subsequent to impairment.

We had no troubled debt restructurings for the three months ended September 30, 2011. During the nine months ended September 30, 2011, we foreclosed on a previously impaired mortgage loan with a book value of $9.8 million and transferred it into other long-term investments in our consolidated balance sheets. No realized loss was recognized on this troubled debt restructuring.

As of September 30, 2011, we held two mortgage loans that were past due regarding principal and interest payments and for which we had discontinued the accrual of investment income. One loan was greater than 90 days past due and had a carrying value of $10.1 million, and the other loan was greater than 30 days past due and had a carrying value of $9.5 million. As of December 31, 2010, none of our mortgage loans were past due regarding principal and interest payments, and none were on nonaccrual status.

At September 30, 2011, we had non-binding commitments of $17.8 million to fund certain commercial mortgage loans.

26

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2011

Note 4 - Investments - Continued

Transfers of Financial Assets

To manage our cash position more efficiently, we 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 transactions. These transactions 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 transactions and repurchase agreements as collateralized financings. As of September 30, 2011, the carrying amount of fixed maturity securities loaned to third parties under our securities lending program was $344.5 million, for which we received collateral in the form of cash and securities of $342.4 million and $15.4 million, respectively. We had no outstanding repurchase agreements at September 30, 2011.

Realized Investment Gain and Loss

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

	Three Months Ended September 30						Nine Months Ended September 30
	2011			2010			2011			2010
	(in millions of dollars)
Fixed Maturity Securities
Gross Gains on Sales	$	14.8		$	6.0		$	33.0		$	35.4
Gross Losses on Sales	(5.4		)	(4.1		)	(22.1		)	(25.8		)
Other-Than-Temporary Impairment Loss	(1.2		)	—			(4.2		)	(10.4		)
Mortgage Loans and Other Invested Assets
Gross Gains on Sales	1.6			0.3			7.1			6.9
Gross Losses on Sales	—			—			(0.2		)	(0.5		)
Impairment Loss	(0.4		)	(0.4		)	(0.4		)	(2.1		)
Foreign Currency Transactions	0.4			(2.3		)	(1.1		)	(2.6		)
Embedded Derivative in Modified Coinsurance Arrangement	(33.7		)	1.6			(24.4		)	(3.7		)
Net Realized Investment Gain (Loss)	$	(23.9	)	$	1.1		$	(12.3	)	$	(2.8	)

Note 5 - Derivative Financial Instruments

Purpose of Derivatives

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

27

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2011

Note 5 - Derivative Financial Instruments - Continued

Our cash flow hedging programs are as follows:

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

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

• Options on forward interest rate swaps are used to hedge the interest rate risk on certain insurance liabilities with minimum interest rate guarantees. By purchasing options on interest rate swaps, we are able to lock in the minimum investment yields needed to meet the required interest rate guarantee on the insurance liabilities.

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

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

Our fair value hedging programs are as follows:

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

Derivative Risks

The basic types of risks associated with derivatives are market risk (that the value of the derivative will be adversely impacted by changes in the market, primarily the change in interest and exchange rates) and credit risk (that the counterparty will not perform according to the terms of the contract). The market risk of the derivatives should generally offset the market risk associated with the hedged financial instrument or liability.

To help limit the credit exposure of the derivatives, we enter into master netting agreements with our counterparties whereby contracts in a gain position can be offset against contracts in a loss position. We also typically enter into bilateral, cross-collateralization agreements with our counterparties to help limit the credit exposure of the derivatives. These agreements require the counterparty in a loss position to submit acceptable collateral with the other counterparty in the event the net loss

28

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2011

Note 5 - Derivative Financial Instruments - Continued

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 $23.2 million at September 30, 2011. We held no cash collateral from our counterparties as of September 30, 2011. We held cash collateral of $39.1 million from our counterparties as of December 31, 2010. This unrestricted cash collateral is included in short-term investments, and the associated obligation to return the collateral to our counterparties is included in other liabilities in our consolidated balance sheets. We post either fixed maturity securities or cash as collateral to our counterparties. The carrying value of fixed maturity securities posted as collateral to our counterparties was $131.6 million and $158.8 million at September 30, 2011 and December 31, 2010, respectively. We had no cash posted as collateral to our counterparties at September 30, 2011 and December 31, 2010.

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 $154.7 million and $199.6 million at September 30, 2011 and December 31, 2010, respectively.

Hedging Activity

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

	Swaps
	Receive Variable/Pay Fixed		Receive Fixed/Pay Fixed		Receive Fixed/Pay Variable		Forwards		Total
			(in millions of dollars)
Balance at June 30, 2011	$	174.0	$	579.7	$	785.0	$	—	$	1,538.7
Additions	—		—		—		15.0		15.0
Terminations	—		5.0		50.0		—		55.0
Balance at September 30, 2011	$	174.0	$	574.7	$	735.0	$	15.0	$	1,498.7
Balance at December 31, 2010	$	174.0	$	617.9	$	890.0	$	—	$	1,681.9
Additions	—		—		—		46.9		46.9
Terminations	—		43.2		155.0		31.9		230.1
Balance at September 30, 2011	$	174.0	$	574.7	$	735.0	$	15.0	$	1,498.7

The following table summarizes the timing of anticipated settlements of interest rate swaps outstanding under our cash flow hedging programs at September 30, 2011, whereby we receive a fixed rate and pay a variable rate. The weighted average variable interest rates assume current market conditions.

	2011			2012			2013			Total
				(in millions of dollars)
Notional Value	$	50.0		$	185.0		$	150.0		$	385.0
Weighted Average Receive Rate	5.16		%	6.49		%	6.34		%	6.26		%
Weighted Average Pay Rate	0.37		%	0.37		%	0.37		%	0.37		%

Cash Flow Hedges

As of September 30, 2011 and December 31, 2010, we had $385.0 million and $540.0 million, respectively, notional amount of forward starting interest rate swaps to hedge the anticipated purchase of fixed maturity securities.

As of September 30, 2011 and December 31, 2010, we had $574.7 million and $617.9 million, respectively, notional amount of open current and forward foreign currency swaps to hedge fixed income foreign dollar-denominated securities.

29

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2011

Note 5 - Derivative Financial Instruments - Continued

As of September 30, 2011, we had $15.0 million notional amount of open forward treasury locks to hedge the interest rate risk associated with the anticipated proceeds to be received from the call of specific fixed maturity securities. During the nine months ended September 30, 2011, we also entered into and subsequently terminated $31.9 million notional amount of forward treasury locks used to minimize interest rate risk associated with the anticipated disposal of certain fixed maturity securities. These treasury locks were terminated at the time the securities were called and/or sold, and we recognized a gain of $0.1 million on the termination of these hedges. The gain was recognized in other comprehensive income and subsequently amortized into net investment income. We had no open forward treasury locks at December 31, 2010.

During the third quarter of 2010, we terminated $250.0 million notional amount of forward starting interest rate swaps used to hedge the interest rate risk associated with the anticipated issuance of long-term debt. The swaps were terminated at the time the debt was issued. We recognized a loss of $18.5 million on the termination of these hedges. This loss was recognized in other comprehensive income and is being amortized into earnings as a component of interest and debt expense, which has the effect of increasing the periodic interest expense on our debt issued in 2010.

For the nine months ended September 30, 2011 and 2010, there was no material ineffectiveness related to our cash flow hedges, and no component of the derivative instruments’ gain or loss was excluded from the assessment of hedge effectiveness.

As of September 30, 2011, we expect to amortize approximately $33.6 million of net deferred gains on derivative instruments during the next twelve months. This amount will be reclassified from accumulated other comprehensive income into earnings and reported on the same income statement line item as the hedged item. The income statement line items that will be affected by this amortization are net investment income and interest and debt expense. The estimated amortization includes the impact of certain derivative contracts that have not yet been terminated as of September 30, 2011. Fluctuations in fair values of these derivatives between September 30, 2011 and the date of termination will vary our projected amortization. Amounts that will be reclassified from accumulated other comprehensive income into earnings to offset the earnings impact of foreign currency translation of hedged items are not estimable.

As of September 30, 2011, we are hedging the variability of future cash flows associated with forecasted transactions through the year 2038.

Fair Value Hedges

As of September 30, 2011 and December 31, 2010, we had $174.0 million notional amount of receive variable, pay fixed interest rate swaps to hedge the changes in fair value of certain fixed rate securities held. These swaps effectively convert the associated fixed rate securities into floating rate securities, which are used to fund our floating rate long-term debt. Changes in the fair value of the derivative and changes in the fair value of the hedged item attributable to the risk being hedged are recognized in current earnings as a component of net realized investment gain or loss during the period of change in fair value.  For the nine months ended September 30, 2011 and 2010, the change in fair value of the hedged fixed maturity securities attributable to the hedged benchmark interest rate resulted in gains of $8.7 million and $15.9 million, respectively, with offsetting losses on the related interest rate swaps.

As of September 30, 2011 and December 31, 2010, we had a $350.0 million notional amount receive fixed, pay variable interest rate swap to hedge the changes in the fair value of certain fixed rate long-term debt. This swap effectively converts the associated fixed rate long-term debt into floating rate debt and provides for a better matching of interest rates with our short-term investments, which have frequent interest rate resets similar to a floating rate security. For the nine months ended September 30, 2011, the change in fair value of the hedged fixed debt attributable to the hedged benchmark interest rate resulted in a loss of $22.0 million, with an offsetting gain on the related interest rate swaps.

For the nine months ended September 30, 2011 and 2010, 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.

30

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2011

Note 5 - Derivative Financial Instruments - Continued

Derivatives Not Designated as Hedging Instruments

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

Locations and Amounts of Derivative Financial Instruments

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

	September 30, 2011
	(in millions of dollars)
	Asset Derivatives			Liability Derivatives
	Balance Sheet Location	Fair Value		Balance Sheet Location	Fair Value
Designated as Hedging Instruments
Interest Rate Swaps and Forwards	Other L-T Investments	$	140.8	Other Liabilities	$	33.5
Foreign Exchange Contracts	Other L-T Investments	2.4		Other Liabilities	121.2
Total		$	143.2		$	154.7
Not Designated as Hedging Instruments
Embedded Derivative in Modified Coinsurance Arrangement				Other Liabilities	$	120.7

	December 31, 2010
	(in millions of dollars)
	Asset Derivatives			Liability Derivatives
	Balance Sheet Location	Fair Value		Balance Sheet Location	Fair Value
Designated as Hedging Instruments
Interest Rate Swaps	Other L-T Investments	$	98.4	Other Liabilities	$	39.1
Foreign Exchange Contracts	Other L-T Investments	0.7		Other Liabilities	160.5
Total		$	99.1		$	199.6
Not Designated as Hedging Instruments
Embedded Derivative in Modified Coinsurance Arrangement				Other Liabilities	$	96.3

31

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2011

Note 5 - Derivative Financial Instruments - Continued

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

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

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

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

(3) Loss recognized in interest and debt expense

	Three Months Ended September 30, 2010
	Loss Recognized in OCI on Derivatives (Effective Portion)			Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)				Gain (Loss) Recognized in Income on Derivatives (Ineffective Portion)
	(in millions of dollars)
Interest Rate Swaps and Forwards	$	(7.7	)	$	6.9		(1)	$	—
Interest Rate Swaps	—			1.6			(2)	—
Interest Rate Swaps	—			(0.1		)	(3)	—
Foreign Exchange Contracts	—			(0.4		)	(1)	—
Foreign Exchange Contracts	(34.5		)	(21.2		)	(2)	—
Foreign Exchange Contracts	—			0.7			(3)	—
Total	$	(42.2	)	$	(12.5	)		$	—

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

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

(3) Gain (loss) recognized in interest and debt expense

32

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2011

Note 5 - Derivative Financial Instruments - Continued

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

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

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

(3) Loss recognized in interest and debt expense

	Nine Months Ended September 30, 2010
	Gain (Loss) Recognized in OCI on Derivatives (Effective Portion)			Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)				Gain (Loss) Recognized in Income on Derivatives (Ineffective Portion)
	(in millions of dollars)
Interest Rate Swaps and Forwards	$	16.8		$	22.5		(1)	$	—
Interest Rate Swaps	—			4.2			(2)	—
Interest Rate Swaps	—			(0.1		)	(3)	—
Interest Rate Swaps	—			(0.1		)	(4)	—
Foreign Exchange Contracts	—			(1.5		)	(1)	—
Foreign Exchange Contracts	(3.9		)	(7.7		)	(2)	—
Foreign Exchange Contracts	—			1.9			(3)	—
Total	$	12.9		$	19.2			$	—

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

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

(3) Gain (loss) recognized in interest and debt expense

(4) Loss recognized in other income

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

	Three Months Ended September 30					Nine Months Ended September 30
	2011			2010		2011			2010
	(in millions of dollars)
Gain (Loss) Recognized in Net Realized Investment Gain (Loss)	$	(33.7	)	$	1.6	$	(24.4	)	$	(3.7	)

33

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2011

Note 6 - Segment Information

Our reporting segments are comprised of the following: Unum US, Unum UK, Colonial Life, Individual Disability - Closed Block, and Corporate and Other.

Premium income by major line of business within each of our segments is presented as follows. Certain prior year amounts within Unum UK have been reclassified to conform to current year presentation.

	Three Months Ended September 30					Nine Months Ended September 30
	2011			2010		2011			2010
	(in millions of dollars)
Unum US
Group Disability
Group Long-term Disability	$	393.7		$	404.9	$	1,185.3		$	1,233.6
Group Short-term Disability	115.2			108.7		339.0			322.5
Group Life and Accidental Death & Dismemberment
Group Life	277.6			273.0		825.3			814.5
Accidental Death & Dismemberment	27.7			27.0		81.6			79.3
Supplemental and Voluntary
Individual Disability - Recently Issued	116.6			116.7		348.3			349.5
Long-term Care	152.1			149.4		453.5			448.1
Voluntary Benefits	143.6			130.9		433.5			395.7
	1,226.5			1,210.6		3,666.5			3,643.2
Unum UK
Group Long-term Disability	107.3			101.8		318.3			310.7
Group Life	52.1			44.5		151.6			126.8
Supplemental and Voluntary	16.1			15.1		48.5			42.6
	175.5			161.4		518.4			480.1
Colonial Life
Accident, Sickness, and Disability	174.3			166.1		519.7			493.1
Life	47.0			43.4		140.0			131.0
Cancer and Critical Illness	62.4			59.8		186.4			178.0
	283.7			269.3		846.1			802.1
Individual Disability - Closed Block	196.4			208.5		595.0			635.0
Corporate and Other	(0.9		)	0.4		(0.3		)	2.8
Total	$	1,881.2		$	1,850.2	$	5,625.7		$	5,563.2

34

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2011

Note 6 - Segment Information - Continued

Selected operating statement data by segment is presented as follows:

	Unum US		Unum UK		Colonial Life		Individual Disability - Closed Block		Corporate and Other			Total
	(in millions of dollars)
Three Months Ended September 30, 2011
Premium Income	$	1,226.5	$	175.5	$	283.7	$	196.4	$	(0.9	)	$	1,881.2
Net Investment Income	332.4		43.3		32.5		181.9		39.1			629.2
Other Income	30.4		—		0.1		23.6		5.0			59.1
Operating Revenue	$	1,589.3	$	218.8	$	316.3	$	401.9	$	43.2		$	2,569.5
Operating Income (Loss)	$	219.5	$	34.9	$	70.3	$	14.0	$	(21.5	)	$	317.2
Three Months Ended September 30, 2010
Premium Income	$	1,210.6	$	161.4	$	269.3	$	208.5	$	0.4		$	1,850.2
Net Investment Income	312.9		39.0		31.9		185.5		49.1			618.4
Other Income	29.7		0.2		0.2		22.7		5.4			58.2
Operating Revenue	$	1,553.2	$	200.6	$	301.4	$	416.7	$	54.9		$	2,526.8
Operating Income (Loss)	$	204.7	$	47.2	$	74.5	$	9.8	$	(10.8	)	$	325.4
Nine Months Ended September 30, 2011
Premium Income	$	3,666.5	$	518.4	$	846.1	$	595.0	$	(0.3	)	$	5,625.7
Net Investment Income	983.1		139.3		99.6		544.2		118.8			1,885.0
Other Income	91.1		0.1		0.4		67.9		15.3			174.8
Operating Revenue	$	4,740.7	$	657.8	$	946.1	$	1,207.1	$	133.8		$	7,685.5
Operating Income (Loss)	$	646.7	$	138.3	$	214.5	$	34.3	$	(60.0	)	$	973.8
Nine Months Ended September 30, 2010
Premium Income	$	3,643.2	$	480.1	$	802.1	$	635.0	$	2.8		$	5,563.2
Net Investment Income	936.2		121.9		91.1		563.5		148.5			1,861.2
Other Income	90.6		1.1		0.5		67.3		19.0			178.5
Operating Revenue	$	4,670.0	$	603.1	$	893.7	$	1,265.8	$	170.3		$	7,602.9
Operating Income (Loss)	$	619.9	$	160.7	$	221.4	$	33.9	$	(37.3	)	$	998.6

35

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2011

Note 6 - Segment Information - Continued

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

	Three Months Ended September 30					Nine Months Ended September 30
	2011			2010		2011			2010
	(in millions of dollars)
Operating Revenue by Segment	$	2,569.5		$	2,526.8	$	7,685.5		$	7,602.9
Net Realized Investment Gain (Loss)	(23.9		)	1.1		(12.3		)	(2.8		)
Revenue	$	2,545.6		$	2,527.9	$	7,673.2		$	7,600.1
Operating Income by Segment	$	317.2		$	325.4	$	973.8		$	998.6
Net Realized Investment Gain (Loss)	(23.9		)	1.1		(12.3		)	(2.8		)
Income Tax	87.7			105.7		300.7			335.5
Net Income	$	205.6		$	220.8	$	660.8		$	660.3

Assets by segment are as follows:

	September 30 2011		December 31 2010
	(in millions of dollars)
Unum US	$	26,701.7	$	24,876.9
Unum UK	3,568.3		3,386.3
Colonial Life	3,294.7		3,047.3
Individual Disability - Closed Block	16,109.4		15,509.1
Corporate and Other	10,366.8		10,488.1
Total	$	60,040.9	$	57,307.7

36

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2011

Note 7 - Pensions and Other Postretirement Benefits

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

	Three Months Ended September 30
	2011			2010			2011			2010			2011			2010
	Pension Benefits
	U.S. Plans						Non U.S. Plans						OPEB
	(in millions of dollars)
Service Cost	$	10.7		$	9.2		$	1.1		$	0.9		$	0.5		$	0.6
Interest Cost	19.4			17.8			2.3			2.4			2.5			2.7
Expected Return on Plan Assets	(21.9		)	(17.7		)	(3.1		)	(2.7		)	(0.2		)	(0.2		)
Amortization of:
Net Actuarial Loss	8.0			7.4			—			0.6			—			—
Prior Service Credit	(0.1		)	(0.1		)	—			—			(0.6		)	(0.6		)
Net Periodic Benefit Cost	$	16.1		$	16.6		$	0.3		$	1.2		$	2.2		$	2.5
	Nine Months Ended September 30
	2011			2010			2011			2010			2011			2010
	Pension Benefits
	U.S. Plans						Non U.S. Plans						OPEB
	(in millions of dollars)
Service Cost	$	32.0		$	27.4		$	3.5		$	3.4		$	1.4		$	1.9
Interest Cost	58.2			53.4			6.7			7.1			7.5			8.1
Expected Return on Plan Assets	(65.7		)	(52.9		)	(9.2		)	(7.9		)	(0.5		)	(0.5		)
Amortization of:
Net Actuarial Loss	24.0			22.3			—			1.8			—			—
Prior Service Credit	(0.4		)	(0.4		)	—			—			(1.9		)	(1.9		)
Net Periodic Benefit Cost	$	48.1		$	49.8		$	1.0		$	4.4		$	6.5		$	7.6

We have no regulatory contribution requirements for our U.S. qualified defined benefit plan in 2011. For our U.K. operation, which maintains a separate defined benefit plan, we made required contributions totaling $1.2 million and $3.6 million in the third quarter and first nine months of 2011, respectively, or approximately £0.7 million and £2.2 million.

37

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2011

Note 8 - Stockholders' Equity and Earnings Per Common Share

Net income per common share is determined as follows:

	Three Months Ended September 30				Nine Months Ended September 30
	2011		2010		2011		2010
	(in millions of dollars, except share data)
Numerator
Net Income	$	205.6	$	220.8	$	660.8	$	660.3
Denominator (000s)
Weighted Average Common Shares - Basic	298,185.8		323,083.5		305,694.5		328,828.6
Dilution for Assumed Exercises of Stock Options and Nonvested Stock Awards	987.1		1,383.5		1,223.9		1,344.5
Weighted Average Common Shares - Assuming Dilution	299,172.9		324,467.0		306,918.4		330,173.1
Net Income Per Common Share
Basic	$	0.69	$	0.68	$	2.16	$	2.01
Assuming Dilution	$	0.69	$	0.68	$	2.15	$	2.00

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

The outstanding stock options have exercise prices ranging from $11.37 to $26.29, the nonvested stock awards have grant prices ranging from $10.59 to $26.31, and the performance restricted stock units have a threshold stock price of $26.00.

In computing earnings per share assuming dilution, only potential common shares that are dilutive (those that reduce earnings per share) are included. Potential common shares not included in the computation of dilutive earnings per share because their impact would be antidilutive, based on current market prices, approximated 2.4 million and 2.1 million shares of common stock for the three and nine month periods ended September 30, 2011, and 3.6 million common shares for the three and nine month periods ended September 30, 2010.

In May 2010, our board of directors authorized the repurchase of up to $500.0 million of Unum Group’s common stock. For the three and nine month periods ended September 30, 2010, we repurchased 9.5 million and 15.2 million shares for $197.7 million and $327.5 million, respectively, including commissions of $0.2 million and $0.3 million. For the year ended December 31, 2010, we repurchased 16.4 million shares at a cost of $356.0 million, including commissions of $0.3 million, under this share repurchase program.

On February 2, 2011, our board of directors authorized the repurchase of up to $1.0 billion of Unum Group's common stock, in addition to the amount remaining to be repurchased under the $500.0 million authorization. The $1.0 billion share repurchase program has an expiration date of August 2012.

On February 4, 2011, we repurchased 7.1 million shares, at a cost of $200.0 million, using an accelerated repurchase agreement with a financial counterparty. As part of this transaction, we simultaneously entered into a forward contract indexed to the price of Unum Group common stock, which subjected the transaction to a future price adjustment. Under the terms of the repurchase agreement, we were to receive, or be required to pay, a price adjustment based on the volume weighted average price of Unum Group common stock during the term of the agreement, less a discount. Any price adjustment payable to us was to be settled in shares of Unum Group common stock. Any price adjustment we would have been required to pay would have been settled in either cash or common stock. The final price adjustment settlement occurred on March 18, 2011 resulting in the delivery to us of 0.6 million additional shares. In total, we repurchased 7.7 million shares pursuant to the accelerated repurchase agreement, which completed the $500.0 million repurchase authorization and initiated the $1.0 billion repurchase program.

38

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2011

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

In addition to these repurchases, for the three and nine month periods ended September 30, 2011, we repurchased an additional 11.1 million and 17.7 million shares on the open market at a cost of $250.2 million and $419.9 million, respectively, including commissions of $0.2 million and $0.3 million. The dollar value of shares remaining under the $1.0 billion repurchase program at September 30, 2011 is $524.7 million.

Pursuant to these repurchase programs, we retired 7.7 million shares during the first quarter of 2011. All other repurchased shares have been classified as treasury stock and accounted for using the cost method.

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

Note 9 - Commitments and Contingent Liabilities

Contingent Liabilities

We are a defendant in a number of litigation matters. In some of these matters, no specified amount is sought. In others, very large or indeterminate amounts, including punitive and treble damages, are asserted. There is a wide variation of pleading practice permitted in the United States courts with respect to requests for monetary damages, including some courts in which no specified amount is required and others which allow the plaintiff to state only that the amount sought is sufficient to invoke the jurisdiction of that court. Further, some jurisdictions permit plaintiffs to allege damages well in excess of reasonably

possible verdicts. Based on our extensive experience and that of others in the industry with respect to litigating or resolving claims through settlement over an extended period of time, we believe that the monetary damages asserted in a lawsuit or claim bear little relation to the merits of the case, or the likely disposition value. Therefore, the specific monetary relief sought is not stated.

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

Claims Handling Matters

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

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

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2011

Note 9 - Commitments and Contingent Liabilities - Continued

Broker Compensation, Quoting Process, and Other Matters

Examinations and Investigations

In November 2009, we were contacted by Florida state insurance regulators to discuss a resolution of their investigation of our compliance with state and federal laws with respect to producer compensation, solicitation activities, policies sold to state or municipal entities, and information regarding compensation arrangements with brokers. This investigation commenced in 2005, and, until the November 2009 contact, we had received no communications from the regulators regarding this matter since December 2007. Negotiations are ongoing.  

Broker-Related Litigation

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

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

Miscellaneous Matters

In September 2008, we received service of a complaint, in an adversary proceeding in connection with the bankruptcy case In

re Quebecor World (USA) Inc., et al. entitled Official Committee of Unsecured Creditors of Quebecor World (USA) Inc., et al., v. American United Life Insurance Company, et al., filed in the United States Bankruptcy Court for the Southern District of New York.  The complaint alleges that we received preference payments relating to notes held by certain of our insurance subsidiaries and seeks to avoid and recover such payments plus interest and cost of the action.  On July 27, 2011, the Bankruptcy Court ruled in our favor, granting a summary judgment motion to dismiss the case against us and the other defendants. This decision has been appealed to the United States District Court for the Southern District of New York.

In July 2010, we received a subpoena from the Office of the New York Attorney General requesting documents and information relating to certain group life insurance policies wherein we paid life insurance proceeds by establishing interest-bearing retained asset accounts. We furnished the requested documents and information. Our last submission was made on October 6, 2010. Because we have received no further communications from the New York Attorney General following our response, we consider this investigation to be dormant.

In October 2010, Denise Merrimon, Bobby S. Mowery, and all others similarly situated vs. Unum Life Insurance Company of America, was filed in the United States District Court for the District of Maine. This is a putative class action alleging that we breached fiduciary duties owed to certain beneficiaries under certain group life insurance policies when we paid life insurance proceeds by establishing interest-bearing retained asset accounts rather than by mailing checks. Plaintiffs seek to represent a class of beneficiaries under group life insurance contracts that were employee welfare benefit plans under ERISA and under which we paid death benefits pursuant to a retained asset account. Plaintiffs seek to recover on behalf of the class the difference between the interest paid to them and amounts alleged to have been realized by us through our investment of the retained assets. We intend to vigorously defend the action.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2011

Note 9 - Commitments and Contingent Liabilities - Continued

In March 2011, we received a request for information from an independent third party as part of an examination on behalf of 26 states and the District of Columbia to evaluate our compliance with the unclaimed property laws of the participating states. Industry-wide practices are currently under review concerning the identification and handling of unclaimed property by insurers, and numerous other insurers are under similar examination. We are cooperating fully with this examination. In July 2011, the New York State Insurance Department issued a special request to approximately 160 insurers, including Unum Group's New York licensed insurance subsidiaries, which requires the insurers to cross-check their life insurance policies, annuity contracts, and retained asset accounts with the latest version of the Social Security Master Death Index to identify any matches. Insurers are also requested to investigate the matches to determine if death benefits are due, to locate the beneficiaries, and to make payments where appropriate. We are cooperating fully with this request. It is possible other state jurisdictions may pursue similar investigations or inquiries or issue directives similar to the New York Insurance Department's letter. It is possible that the audits and related activity may result in additional payments to beneficiaries, the payment of abandoned funds under state law, and/or administrative penalties. We are currently unable to estimate the reasonably possible amount of any additional payments.

Summary

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

Given the complexity and scope of our litigation and regulatory matters, it is not possible to predict the ultimate outcome of all pending investigations or legal proceedings or provide reasonable estimates of potential losses, except where 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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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - Continued

Unum Group and Subsidiaries

September 30, 2011

Note 10 - Other

Debt

During the nine months ended September 30, 2011, we made principal payments of $59.4 million and $7.5 million on our senior secured non-recourse floating rate notes issued by Northwind Holdings, LLC and Tailwind Holdings, LLC, respectively.

During the first quarter of 2011, the remaining $225.1 million of our 7.625% senior notes due March 2011 matured.

At September 30, 2011, short-term debt consisted of $342.4 million of securities lending transactions.

Income Tax

At September 30, 2011, we had a liability of $133.5 million for unrecognized tax benefits, $118.3 million of which is associated with deferred tax assets. The total unrecognized tax benefit that would impact the effective tax rate, if recognized, is $15.2 million. The interest expense and penalties related to unrecognized tax expense in our consolidated statements of income was $1.5 million and $4.1 million for the three and nine months ended September 30, 2011, respectively, and $1.5 million and $4.0 million for the three and nine months ended September 30, 2010, respectively.

During 2009, we had a conference with the Internal Revenue Service (IRS) with respect to our appeal of audit adjustments for the years 1999 to 2004. Although we have not yet reached a final settlement with the IRS for these years, it is reasonably possible that this appeal will be resolved in whole or in part within 12 months and that statutes of limitations may expire in multiple jurisdictions within the same period.  As a result, it is reasonably possible that our liability for unrecognized tax benefits could decrease within 12 months by $0 million to $55.0 million.  We believe sufficient provision has been made for all uncertain tax provisions and that any adjustments by tax authorities with respect to such positions would not have a material adverse effect on our financial position, liquidity, or results of operations.

The income tax rate in the U.K. is expected to be reduced annually, at least one percent per year, beginning in April 2011, with the ultimate goal of reducing the rate from 28 percent to 23 percent. An income tax rate reduction was enacted which reduced the tax rate from 28 percent to 27 percent in the third quarter of 2010, effective April 2011. In the third quarter of 2011, an income tax rate reduction was enacted which reduced the tax rate from 27 percent to 26 percent, retroactive to April 2011, and from 26 percent to 25 percent, effective April 2012.  We are required to adjust deferred tax assets and liabilities through income on the date of enactment of a rate change, and as such, we recorded a reduction of $6.8 million and $2.7 million to our income tax expense during the third quarters of 2011 and 2010, respectively.

In March 2010, the Patient Protection and Affordable Care Act and the Health Care and Education Reconciliation Act of 2010 were signed into law.  Among other things, the new legislation reduces the tax benefits available to an employer that receives a postretirement prescription drug coverage subsidy from the federal government under the Medicare Prescription Drug, Improvement and Modernization Act of 2003.  Under the new legislation, to the extent our future postretirement prescription drug coverage expenses are reimbursed under the subsidy program, the expenses covered by the subsidy will no longer be tax deductible after 2012.  Employers that receive the subsidy must recognize the deferred tax effects relating to the future postretirement prescription drug coverage in the period the legislation was enacted.  Our income tax expense for the first nine months of 2010 includes a non-cash tax charge of $10.2 million which was recorded in the first quarter of 2010 to reflect the impact of the tax law change.

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Report of Independent Registered Public Accounting Firm

Board of Directors and Stockholders

Unum Group and Subsidiaries

We have reviewed the consolidated balance sheet of Unum Group and subsidiaries as of September 30, 2011, and the related consolidated statements of income and comprehensive income for the three and nine-month periods ended September 30, 2011 and 2010, and the consolidated statements of stockholders’ equity and cash flows for the six-month periods ended September 30, 2011 and 2010. These financial statements are the responsibility of the Company’s management.

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

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

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, 2010, and the related consolidated statements of income, stockholders’ equity, cash flows and comprehensive income (loss) for the year then ended not presented herein and in our report dated February 25, 2011, we expressed an unqualified opinion on those consolidated financial statements.

/s/ ERNST & YOUNG LLP

Chattanooga, Tennessee

November 2, 2011

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

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

As one of the leading providers of employee benefits in the U.S. and the U.K., we offer a broad portfolio of products and services to meet the diverse and rapidly changing needs of employers and their employees. Specifically, we offer group, individual, and voluntary benefits -- either as stand-alone products or combined with other coverages -- that create comprehensive benefits solutions for employers of all sizes by helping them attract and retain a stronger workforce while protecting the incomes and lifestyles of their employees. We believe employer-sponsored benefits represent the single most effective way to provide workers with access to the information and options they need to protect their lifestyle and provide financial security. Working people and their families, particularly those at middle and lower incomes, are perhaps the most vulnerable in today's economy yet are often overlooked by many providers of financial services and products. For many of these people, employer-sponsored benefits are the primary defense against the potentially catastrophic fallout of death, illness, or injury.

We have established a corporate culture consistent with the social values our products provide. We are committed to not only 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 consumer confidence, employment levels, and interest rates. 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 2010 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, 2010.

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Executive Summary

During 2011, our focus has remained on disciplined top-line growth and capital management. Objectives for the year include:

• Continue to consistently execute against our operating plans, which emphasize disciplined, profitable growth;

• Further enhance our financial flexibility through solid operating and investment performance and a sustainable capital deployment strategy;

• Leverage our capabilities, products, relationships, and reputation to deliver on our commitments as well as our bottom-line targets;

• Continue to invest in our businesses and leverage global capabilities to capitalize on current and future growth opportunities.

A discussion of our operating performance and capital management follows.

Operating Performance and Capital Management

For the third quarter of 2011, we reported net income of $205.6 million, or $0.69 per diluted common share, compared to $220.8 million, or $0.68 per diluted common share for the third quarter of 2010. For the first nine months of 2011, net income was $660.8 million, or $2.15 per diluted common share, compared to $660.3 million, or $2.00 per diluted common share, for the comparable period of last year. After-tax operating income for the third quarter of 2011 was $221.5 million, or $0.74 per diluted common share, compared to $219.9 million, or $0.68 per diluted common share, in the third quarter of 2010. For the first nine months of 2011, after-tax operating income was $669.2 million, or $2.18 per diluted common share, compared to $672.0 million, or $2.04 per diluted common share, for the first nine months of 2010. Our income tax expense for the third quarter and first nine months of both 2011 and 2010 includes a reduction to our income tax expense to reflect the enactments of changes in the U.K. income tax rates during the third quarters of 2011 and 2010. Our 2011 income tax rate was also lower than the prior year periods due primarily to our increased level of investments in low-income housing tax credit partnerships. In addition, the increase in 2011 after-tax operating income per share relative to last year was aided by the repurchase of our common stock during 2010 and the first nine months of 2011.

Operating revenue by segment was marginally higher than the third quarter and first nine months of 2010, with the current economic environment continuing to negatively impact our premium growth. Operating income by segment declined 2.5 percent in both the third quarter and first nine months of 2011 relative to the same periods of 2010, with growth in our Unum US segment offset by lower earnings in our other core segments. See “Reconciliation of Non-GAAP Financial Measures” contained herein in Item 2.

Our Unum US segment reported an increase in segment operating income of 7.2 percent and 4.3 percent in the third quarter and first nine months of 2011 compared to the same periods in 2010, with higher net investment income offsetting the slightly unfavorable overall risk experience. The benefit ratio for the Unum US segment for the third quarter and first nine months of 2011 was 80.1 percent and 79.4 percent, compared to 79.5 percent and 79.1 percent in the prior year third quarter and first nine months, with either consistent or year over year improvement in benefit ratios for all product lines other than group disability and long-term care. Although Unum US premium income increased slightly in the third quarter and first nine months of 2011 compared to the same periods of 2010, the ongoing high levels of unemployment and the competitive environment continue to pressure our premium income growth. In particular, premium growth from existing customers continues to be unfavorably impacted by lower salary growth and lower growth in the number of employees covered under existing policies. Unum US sales increased 10.2 percent and 9.7 percent in the third quarter and first nine months of 2011 compared to the comparable periods of 2010. We experienced sales increases in nearly all of our product lines and market segments in the third quarter and first nine months of 2011 compared to the same periods of 2010. Voluntary benefit sales increased 15.7 percent and 5.1 percent for the third quarter and first nine months compared to the same periods of 2010. Our group core market segment, which we define for Unum US as employee groups with fewer than 2,000 lives, reported sales increases of 12.4 percent and 9.3 percent in the third quarter and first nine months of 2011 relative to last year's comparable periods. Persistency, though below the level of last year for some of our Unum US product lines, remains high relative to historical levels.

Our Unum UK segment reported a decrease in segment operating income of 28.6 percent and 18.3 percent in the third quarter and first nine months of 2011, as measured in Unum UK's local currency, relative to the same periods of 2010. The decrease was driven by less favorable risk results and higher expenditures on a year-to-date basis related to Unum UK's growth plans. Premium income grew 4.8 percent and 2.7 percent relative to last year's third quarter and first nine months, although premium growth continues to be pressured by pricing actions resulting from the competitive U.K. market. The benefit ratio for Unum UK was 78.8 percent and 72.7 percent in the third quarter and first nine months of 2011 compared to 66.9 percent and 65.3 percent in the same periods of 2010, driven by less favorable risk experience in group long-term disability. Unum UK sales,

45

which were also negatively impacted by the economy and the competitive pricing environment, declined 30.4 percent and 31.3 percent relative to last year's third quarter and first nine months, as measured in Unum UK's local currency. Persistency was below the level of 2010 but remains strong.

Our Colonial Life segment reported a decrease in segment operating income of 5.6 percent and 3.1 percent in the third quarter and first nine months of 2011 compared to the same periods of 2010. Although premium income grew 5.3 percent and 5.5 percent relative to last year's third quarter and first nine months, risk results were less favorable than last year for the accident, sickness, and disability and the cancer and critical illness product lines, with overall benefit ratios of 52.6 percent and 51.7 percent in the third quarter and first nine months of 2011 compared to 49.9 percent and 48.4 percent in the same periods of 2010. Colonial Life's sales increased 3.6 percent and 0.8 percent relative to the third quarter and first nine months of 2010. The number of new agent contracts increased 4.9 percent and 5.7 percent relative to the third quarter and first nine months of 2010, while the number of new accounts declined by 1.8 percent and 3.0 percent. Persistency was generally stable for the life and cancer and critical illness line of business and was lower for the accident, sickness, and disability line of business relative to the level of 2010.

Our investment portfolio continued to perform well, with an increase in net investment income of 1.7 percent and 1.3 percent relative to the third quarter and first nine months of 2010. The net unrealized gain on our fixed maturity securities was $5.7 billion at the end of the third quarter of 2011, compared to $3.5 billion at year end 2010 and $5.1 billion at the end of the third quarter of 2010.

We believe our capital and financial positions are strong. At September 30, 2011, 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, compared to 398 percent at December 31, 2010. Our leverage ratio, when calculated using consolidated debt to total consolidated capital, was 26.4 percent at September 30, 2011 compared to 25.9 percent at December 31, 2010, with the increase due primarily to the $342.4 million of securities lending agreements outstanding at September 30, 2011, partially offset by the maturity of $225.1 million of senior notes and our principal payments on the debt of Northwind Holdings, LLC (Northwind Holdings) and Tailwind Holdings, LLC (Tailwind Holdings) during the first nine months of 2011. Our leverage ratio, when calculated excluding the non-recourse debt and associated capital of Northwind Holdings and Tailwind Holdings and the short-term debt arising from securities lending agreements, was 21.2 percent at September 30, 2011 compared to 22.8 percent at December 31, 2010. The cash and marketable securities at our holding companies equaled approximately $647 million at September 30, 2011, compared to $1.2 billion at December 31, 2010. During the first nine months of 2011, we repurchased 25.4 million shares of Unum Group's common stock at a cost of $619.9 million. We have completed the $500.0 million share repurchase program authorized in 2010 and purchased $475.3 million under our $1.0 billion share repurchase program authorized in February 2011.

Despite the difficult economic environment, we continue to make steady and disciplined progress, executing on our business plans and maintaining our strong financial position. 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.

Further discussion is included in “Segment Results,” “Investments,” and “Liquidity and Capital Resources” contained in this Item 2.

Critical Accounting Estimates

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

The accounting estimates deemed to be most critical to our financial position and results of operations are those related to reserves for policy and contract benefits, deferred acquisition costs, valuation of investments, pension and postretirement benefit plans, income taxes, and contingent liabilities. There have been no significant changes in our critical accounting estimates during the first nine months of 2011.

For additional information concerning our accounting policies and critical accounting estimates, see 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, 2010.

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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.

Consolidated Operating Results

(in millions of dollars)
	Three Months Ended September 30								Nine Months Ended September 30
	2011			% Change		2010			2011			% Change		2010
Revenue
Premium Income	$	1,881.2		1.7	%	$	1,850.2		$	5,625.7		1.1	%	$	5,563.2
Net Investment Income	629.2			1.7		618.4			1,885.0			1.3		1,861.2
Net Realized Investment Gain (Loss)	(23.9		)	N.M.		1.1			(12.3		)	N.M.		(2.8		)
Other Income	59.1			1.5		58.2			174.8			(2.1	)	178.5
Total Revenue	2,545.6			0.7		2,527.9			7,673.2			1.0		7,600.1
Benefits and Expenses
Benefits and Change in Reserves for Future Benefits	1,635.6			3.0		1,587.5			4,828.0			1.9		4,736.0
Commissions	220.5			3.0		214.0			662.7			3.5		640.1
Interest and Debt Expense	35.1			(0.3	)	35.2			108.1			5.3		102.7
Deferral of Acquisition Costs	(155.6		)	3.1		(150.9		)	(472.1		)	3.6		(455.5		)
Amortization of Deferred Acquisition Costs	125.2			(4.1	)	130.6			400.4			(1.8	)	407.7
Compensation Expense	198.3			2.2		194.1			598.9			2.8		582.8
Other Expenses	193.2			1.2		190.9			585.7			(0.8	)	590.5
Total Benefits and Expenses	2,252.3			2.3		2,201.4			6,711.7			1.6		6,604.3
Income Before Income Tax	293.3			(10.2	)	326.5			961.5			(3.4	)	995.8
Income Tax	87.7			(17.0	)	105.7			300.7			(10.4	)	335.5
Net Income	$	205.6		(6.9	)	$	220.8		$	660.8		0.1		$	660.3
N.M. = not a meaningful percentage

The comparability of our financial results between years is affected by the fluctuation in the British pound sterling to dollar exchange rate. The functional currency of our U.K. operations is the British pound sterling. In periods when the pound weakens, translating pounds into dollars decreases current period results relative to the prior period. In periods when the pound strengthens, translating pounds into dollars increases current period results in relation to the prior period. Our weighted average pound/dollar exchange rate was higher in the third quarter of 2011 relative to the same period of 2010, at 1.608 and 1.553, respectively. For the first nine months of 2011, the exchange rate was higher relative to the first nine months of 2010, at 1.616 and 1.533, respectively. If the 2010 results for our U.K. operations had been translated at the higher exchange rates of 2011, our operating revenue would have been higher by approximately $7.5 million and $32.4 million in the third quarter and first nine months of 2010, respectively, and operating income by segment would have been higher by approximately $1.8 million and $9.0 million. 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 third quarter and first nine months of 2011 includes premium growth, relative to the same periods of 2010, for our Unum US short-term disability, group life and accidental death and dismemberment, long-term care, and voluntary benefits lines of business as well as for Unum UK and Colonial Life. Our Unum US long-term disability line of business experienced a decline in premium income during both the third quarter and first nine months of 2011 relative to the same periods of 2010 due primarily to the ongoing high levels of unemployment and the competitive environment which impact sales growth and premium growth from existing customers. In particular, premium growth from existing customers continues to be unfavorably impacted by lower salary growth and lower growth in the number of employees covered under an existing policy. Premium income in the Individual Disability - Closed Block segment, which is a closed block of business, continued its expected decline.

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Net investment income was higher in the third quarter and first nine months of 2011 relative to the same periods of 2010 due primarily to continued growth in the level of invested assets and higher bond call premiums, partially offset by an increase in the amortization of the principal amount invested in our tax credit partnerships.

We recognized in earnings net realized investment losses of $23.9 million and $12.3 million in the third quarter and first nine months of 2011, respectively, compared to a gain of $1.1 million and a loss of $2.8 million in the same periods of 2010. Included in these amounts were other-than-temporary impairment losses on fixed maturity securities of $1.2 million and $4.2 million in the third quarter and first nine months of 2011, respectively, compared to $10.4 million in the first nine months of 2010, all of which were recognized in earnings. We did not recognize any other-than-temporary losses on fixed maturity securities in the third quarter of 2010.

Also recognized in earnings through realized investment gains and losses was the change in the fair value of an embedded derivative in a modified coinsurance arrangement. During the third quarter and first nine months of 2011, changes in the fair value of this embedded derivative resulted in realized losses of $33.7 million and $24.4 million, respectively, compared to a gain of $1.6 million and a loss of $3.7 million in the same periods of 2010. Gains and losses on this embedded derivative result primarily from a change in credit spreads in the overall investment market.

The benefit ratio was 86.9 percent and 85.8 percent in the third quarter and first nine months of 2011, compared to 85.8 percent and 85.1 percent in the same periods of 2010, respectively, with unfavorable risk results in all of our core segments. Further discussion of our line of business risk results and claims management performance for each of our segments is included in “Segment Results” as follows.

Interest and debt expense in the third quarter of 2011 was generally consistent with the third quarter of 2010. For the first nine months of 2011, interest and debt expense was higher than in the same period of 2010 due to higher levels of outstanding debt during the first quarter of 2011. See “Debt” contained in this Item 2 for additional information.

The deferral of acquisition costs increased in the third quarter and first nine months of 2011 relative to the same periods of 2010, with continued growth in certain of our product lines and the associated increase in deferrable expenses more than offsetting the lower level of deferrable costs in product lines with lower growth. The amortization of acquisition costs in the third quarter and first nine months of 2011 was lower than the same periods of 2010, with a lower level of accelerated amortization related to persistency and lower amortization resulting from favorable mortality experience relative to assumptions for certain of our our interest-sensitive life products more than offsetting the increase in amortization resulting from a higher level of deferred acquisition costs. Compensation expenses were marginally higher in the third quarter and first nine months of 2011 compared to the same periods of 2010. Other expenses were slightly higher in the third quarter of 2011 and were slightly lower in the first nine months of 2011, compared to the same periods of 2010, as we continue our focus on operating effectiveness and expense management.

As previously noted, our income tax rate for the third quarter and first nine months of 2011 was lower relative to the same periods of 2010 due to tax benefits recognized as a result of our increased level of investments in low-income housing tax credit partnerships.

The income tax rate in the U.K. is expected to be reduced annually, at least one percent per year, beginning in April 2011, with the ultimate goal of reducing the rate from 28 percent to 23 percent. In accordance with GAAP, we are required to adjust deferred tax assets and liabilities through income on the date of enactment of a rate change, the first of which occurred during the third quarter of 2010. An additional rate change was enacted during the third quarter of 2011. We recorded a reduction of $6.8 million and $2.7 million to our income tax expense during the third quarters of 2011 and 2010, respectively, to reflect the impact of the rate changes on our net deferred tax liability related to our U.K. operations.

In March 2010, legislation related to healthcare reform was signed into law.  Among other things, the new legislation reduced the tax benefits available to an employer that receives a postretirement prescription drug coverage subsidy from the federal government under the Medicare Prescription Drug, Improvement and Modernization Act of 2003.  Under the new legislation, to the extent our future postretirement prescription drug coverage expenses are reimbursed under the subsidy program, the expenses covered by the subsidy will no longer be tax deductible after 2012.  Employers that receive the subsidy must recognize the deferred tax effects relating to the future postretirement prescription drug coverage in the period the legislation was enacted.  Our income tax expense for the first nine months of 2010 includes a non-cash tax charge of $10.2 million which was recorded in the first quarter of 2010 to reflect the impact of the tax law change.

48

Consolidated Sales Results

(in millions of dollars)
	Three Months Ended September 30						Nine Months Ended September 30
	2011		% Change		2010		2011		% Change		2010
Unum US
Fully Insured Products	$	125.2	9.9	%	$	113.9	$	461.7	9.5	%	$	421.7
Administrative Services Only (ASO) Products	0.4		N.M.		0.1		3.0		66.7		1.8
Total Unum US	125.6		10.2		114.0		464.7		9.7		423.5
Unum UK	21.3		(28.0	)	29.6		62.6		(27.7	)	86.6
Colonial Life	83.2		3.6		80.3		239.5		0.8		237.5
Individual Disability - Closed Block	0.2		—		0.2		0.5		(16.7	)	0.6
Consolidated	$	230.3	2.8		$	224.1	$	767.3	2.6		$	748.2
N.M. = not a meaningful percentage

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

Premiums for fully insured products are reported as premium income. Fees for ASO and family medical leave products are included in other income. Sales, persistency of the existing block of business, and the effectiveness of a renewal program are indicators of growth in premium and fee income. Trends in new sales, as well as existing market share, also indicate the potential for growth in our respective markets and the level of market acceptance of price changes and new product offerings. Sales results may fluctuate significantly due to case size and timing of sales submissions.

We have experienced lower sales growth from some of our product lines during both 2011 and 2010 which we believe is mostly attributable to the current economic environment. We expect this unfavorable pattern may continue in the near term if current economic conditions persist.

See “Segment Results” as follows for additional discussion of sales by 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. We believe operating income or loss which excludes realized investment gains and losses and certain tax items, including the 2010 tax charge to reflect the impact of the tax law change, is a better performance measure and a better indicator of the profitability and underlying trends in our business. Our investment focus is on investment income to support our insurance liabilities as opposed to the generation of realized investment gains and losses, and a long-term focus is necessary to maintain profitability over the life of the business. Realized investment gains and losses depend on market conditions and do not necessarily relate to decisions regarding the underlying business of our segments. However, income or loss excluding realized investment gains and losses and certain tax items does not replace net income or net loss as a measure of overall profitability. We may experience realized investment losses, which will affect future earnings levels since our underlying business is long-term in nature and we need to earn the assumed interest rates in our liabilities.

49

The non-GAAP financial measures of “operating revenue,” “operating income” or “operating loss,” and “after-tax operating income” differ from revenue, income (loss) before income tax, and net income as presented in our consolidated operating results and in income statements prepared in accordance with GAAP due to the exclusion of before-tax realized investment gains and losses and certain tax items.

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

(in millions of dollars)
	Three Months Ended September 30					Nine Months Ended September 30
	2011			2010		2011			2010
Operating Revenue by Segment	$	2,569.5		$	2,526.8	$	7,685.5		$	7,602.9
Net Realized Investment Gain (Loss)	(23.9		)	1.1		(12.3		)	(2.8		)
Revenue	$	2,545.6		$	2,527.9	$	7,673.2		$	7,600.1
Operating Income by Segment	$	317.2		$	325.4	$	973.8		$	998.6
Net Realized Investment Gain (Loss)	(23.9		)	1.1		(12.3		)	(2.8		)
Income Tax	87.7			105.7		300.7			335.5
Net Income	$	205.6		$	220.8	$	660.8		$	660.3

	Three Months Ended September 30
	2011						2010
	(in millions)			per share *			(in millions)			per share *
After-tax Operating Income	$	221.5		$	0.74		$	219.9		$	0.68
Net Realized Investment Gain (Loss)	(23.9		)	(0.08		)	1.1			—
Income Tax on Net Realized Investment Gain (Loss)	(8.0		)	(0.03		)	0.2			—
Net Income	$	205.6		$	0.69		$	220.8		$	0.68
	Nine Months Ended September 30
	2011						2010
	(in millions)			per share *			(in millions)			per share *
After-tax Operating Income	$	669.2		$	2.18		$	672.0		$	2.04
Net Realized Investment Loss	(12.3		)	(0.04		)	(2.8		)	(0.01		)
Income Tax on Net Realized Investment Loss	(3.9		)	(0.01		)	(1.3		)	—
Tax Charge	—			—			(10.2		)	(0.03		)
Net Income	$	660.8		$	2.15		$	660.3		$	2.00
* Assuming Dilution

50

Segment Results

Our reporting segments are comprised of the following: Unum US, Unum UK, Colonial Life, Individual Disability - Closed Block, and Corporate and Other. Financial information for each of the 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. The supplemental and voluntary lines of business are comprised of recently issued disability insurance, group and individual long-term care insurance, and voluntary benefits products.

Unum US Operating Results

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

(in millions of dollars, except ratios)
	Three Months Ended September 30								Nine Months Ended September 30
	2011			% Change		2010			2011			% Change		2010
Operating Revenue
Premium Income	$	1,226.5		1.3	%	$	1,210.6		$	3,666.5		0.6	%	$	3,643.2
Net Investment Income	332.4			6.2		312.9			983.1			5.0		936.2
Other Income	30.4			2.4		29.7			91.1			0.6		90.6
Total	1,589.3			2.3		1,553.2			4,740.7			1.5		4,670.0
Benefits and Expenses
Benefits and Change in Reserves for Future Benefits	982.9			2.1		962.9			2,911.3			1.0		2,882.2
Commissions	136.1			5.0		129.6			409.8			3.4		396.4
Interest and Debt Expense	0.3			—		0.3			0.8			(11.1	)	0.9
Deferral of Acquisition Costs	(85.4		)	4.5		(81.7		)	(261.0		)	3.2		(252.9		)
Amortization of Deferred Acquisition Costs	73.4			(8.5	)	80.2			239.1			(4.2	)	249.5
Other Expenses	262.5			2.1		257.2			794.0			2.6		774.0
Total	1,369.8			1.6		1,348.5			4,094.0			1.1		4,050.1
Operating Income Before Income Tax and Net Realized Investment Gains and Losses	$	219.5		7.2		$	204.7		$	646.7		4.3		$	619.9
Operating Ratios (% of Premium Income):
Benefit Ratio	80.1		%			79.5		%	79.4		%			79.1		%
Other Expense Ratio	21.4		%			21.2		%	21.7		%			21.2		%
Before-tax Operating Income Ratio	17.9		%			16.9		%	17.6		%			17.0		%

51

Unum US Sales

(in millions of dollars)
	Three Months Ended September 30						Nine Months Ended September 30
	2011		% Change		2010		2011		% Change		2010
Sales by Product
Fully Insured Products
Group Disability, Group Life, and AD&D
Group Long-term Disability	$	22.0	4.3	%	$	21.1	$	89.8	11.0	%	$	80.9
Group Short-term Disability	12.4		7.8		11.5		44.1		2.8		42.9
Group Life	25.2		2.9		24.5		96.9		8.5		89.3
AD&D	2.6		—		2.6		8.9		(9.2	)	9.8
Subtotal	62.2		4.2		59.7		239.7		7.5		222.9
Supplemental and Voluntary
Individual Disability - Recently Issued	12.9		11.2		11.6		40.6		28.9		31.5
Long-term Care	7.4		29.8		5.7		22.8		39.0		16.4
Voluntary Benefits	42.7		15.7		36.9		158.6		5.1		150.9
Subtotal	63.0		16.2		54.2		222.0		11.7		198.8
Total Fully Insured Products	125.2		9.9		113.9		461.7		9.5		421.7
ASO Products	0.4		N.M.		0.1		3.0		66.7		1.8
Total Sales	$	125.6	10.2		$	114.0	$	464.7	9.7		$	423.5
Sales by Market Sector
Group Disability, Group Life, and AD&D
Core Market (< 2,000 lives)	$	50.0	12.4	%	$	44.5	$	177.3	9.3	%	$	162.2
Large Case Market	12.2		(19.7	)	15.2		62.4		2.8		60.7
Subtotal	62.2		4.2		59.7		239.7		7.5		222.9
Supplemental and Voluntary	63.0		16.2		54.2		222.0		11.7		198.8
Total Fully Insured Products	125.2		9.9		113.9		461.7		9.5		421.7
ASO Products	0.4		N.M.		0.1		3.0		66.7		1.8
Total Sales	$	125.6	10.2		$	114.0	$	464.7	9.7		$	423.5
N.M. = not a meaningful percentage

Unum US sales increased in the third quarter and first nine months of 2011 compared to the same periods of 2010, led by growth in the group core market segment and the supplemental and voluntary products. Sales in our group core market segment were 12.4 percent and 9.3 percent higher in the third quarter and first nine months of 2011 compared to the same periods of 2010, with higher sales across all product lines. The number of new accounts added in our group core market segment during the third quarter and first nine months of 2011 was 1.9 percent lower and 6.1 percent higher than the number of new accounts added during the same periods of 2010.

Sales in our group large case market segment were 19.7 percent lower in the third quarter of 2011 compared to the same period of 2010 due to continued pricing discipline on new case sales, resulting in lower sales of short-term disability products and group life and accidental death and dismemberment products. Sales in our group large case market segment were 2.8 percent higher in the first nine months of 2011 compared to the same period of 2010 due to higher group long-term disability and group life sales, partially offset by lower group short-term disability and accidental death and dismemberment sales. Our sales mix of group products in the first nine months of 2011 was approximately 74 percent core market and 26 percent large case market.

52

Sales of voluntary benefits were 15.7 percent and 5.1 percent higher in the third quarter and first nine months of 2011 compared to the same periods of 2010. The first nine months of 2011 include two large case voluntary benefit sales totaling $8.3 million. The number of new accounts added in the voluntary benefits product line was 6.4 percent and 6.7 percent higher in the third quarter and first nine months of 2011 compared to the same periods of 2010.

Sales in our individual disability line of business, which are primarily concentrated in the multi-life market, and in long-term care were higher in the third quarter and first nine months of 2011 compared to the same periods of 2010. The year over year increases were partially due to the unusually low volume of sales we experienced during the first nine months of 2010 for these lines of business.

We continue to believe that the group core market and voluntary benefits market, which combined together are approximately 72 percent of our Unum US sales for the first nine months of 2011 and grew 7.3 percent relative to the same period of 2010, represent significant growth opportunities. We will also seek disciplined and opportunistic growth, generally at the market growth rate, in the group large case, group long-term care, and individual disability markets. While in the short-term we expect economic trends to continue to pressure sales growth, we believe we are well positioned for economic recovery.

Unum US Group Disability Operating Results

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

(in millions of dollars, except ratios)
	Three Months Ended September 30								Nine Months Ended September 30
	2011			% Change		2010			2011			% Change		2010
Operating Revenue
Premium Income
Group Long-term Disability	$	393.7		(2.8	)%	$	404.9		$	1,185.3		(3.9	)%	$	1,233.6
Group Short-term Disability	115.2			6.0		108.7			339.0			5.1		322.5
Total Premium Income	508.9			(0.9	)	513.6			1,524.3			(2.0	)	1,556.1
Net Investment Income	153.0			1.9		150.2			454.2			(0.7	)	457.4
Other Income	23.1			7.4		21.5			67.1			3.5		64.8
Total	685.0			—		685.3			2,045.6			(1.6	)	2,078.3
Benefits and Expenses
Benefits and Change in Reserves for Future Benefits	435.0			0.1		434.7			1,289.4			(1.9	)	1,314.6
Commissions	39.9			3.6		38.5			120.2			0.8		119.2
Interest and Debt Expense	0.3			—		0.3			0.8			(11.1	)	0.9
Deferral of Acquisition Costs	(14.7		)	3.5		(14.2		)	(44.9		)	(0.7	)	(45.2		)
Amortization of Deferred Acquisition Costs	15.0			(3.2	)	15.5			44.9			(6.8	)	48.2
Other Expenses	137.4			3.5		132.7			411.1			2.0		402.9
Total	612.9			0.9		607.5			1,821.5			(1.0	)	1,840.6
Operating Income Before Income Tax and Net Realized Investment Gains and Losses	$	72.1		(7.3	)	$	77.8		$	224.1		(5.7	)	$	237.7
Operating Ratios (% of Premium Income):
Benefit Ratio	85.5		%			84.6		%	84.6		%			84.5		%
Other Expense Ratio	27.0		%			25.8		%	27.0		%			25.9		%
Before-tax Operating Income Ratio	14.2		%			15.1		%	14.7		%			15.3		%
Premium Persistency:
Group Long-term Disability									90.1		%			90.2		%
Group Short-term Disability									90.2		%			89.1		%
Case Persistency:
Group Long-term Disability									88.7		%			88.4		%
Group Short-term Disability									87.8		%			87.2		%

53

Group disability premium income decreased in the third quarter and first nine months of 2011 compared to the same periods of 2010, as the ongoing high levels of unemployment and the competitive environment continue to pressure our premium income growth. In particular, premium growth from existing customers continues to be unfavorably impacted by lower salary growth and lower growth in the number of employees covered under an existing policy. Partially offsetting the unfavorable growth trend from existing customers was higher premium persistency for group short-term disability, offset by a slight decline in premium persistency for group long-term disability. Case persistency was higher for the first nine months of 2011 compared to the prior year period for both group long-term and short-term disability.

Net investment income was generally consistent year over year, with higher bond call premiums, a decrease in the level of assets supporting this line of business, and a decline in the level of prepayment income on mortgage-backed securities in 2011 compared to the same periods of 2010. Other income in the third quarter and first nine month of 2011 increased compared to the same periods of 2010 due to higher income from fee-based family medical leave products.

The benefit ratio was higher in the third quarter of 2011 compared to the prior year period due to a higher rate of paid incidence for both long-term disability and short-term disability and a decrease in the claim discount rate for group long-term disability new claim incurrals. The benefit ratio was slightly higher in the first nine months of 2011 compared to the same period of 2010 due to a slight increase in group long-term disability claim incidence rates mostly offset by a higher rate of group long-term disability claim recoveries.

The deferral of acquisition costs in the third quarter and first nine months of 2011 was generally consistent with the same periods of 2010. The amortization of acquisition costs in the third quarter and first nine months of 2011 declined relative to the same periods of 2010 due to a declining balance in the deferred acquisition cost asset. The other expense ratio was higher in the third quarter and first nine months of 2011 relative to the same periods of 2010 due primarily to an increase in expenses associated with the growth in the fee-based family medical leave products as well as lower premium income.

54

Unum US Group Life and Accidental Death and Dismemberment Operating Results

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

(in millions of dollars, except ratios)
	Three Months Ended September 30								Nine Months Ended September 30
	2011			% Change		2010			2011			% Change		2010
Operating Revenue
Premium Income
Group Life	$	277.6		1.7	%	$	273.0		$	825.3		1.3	%	$	814.5
Accidental Death & Dismemberment	27.7			2.6		27.0			81.6			2.9		79.3
Total Premium Income	305.3			1.8		300.0			906.9			1.5		893.8
Net Investment Income	33.7			3.7		32.5			101.6			6.1		95.8
Other Income	0.5			(16.7	)	0.6			1.7			(5.6	)	1.8
Total	339.5			1.9		333.1			1,010.2			1.9		991.4
Benefits and Expenses
Benefits and Change in Reserves for Future Benefits	214.3			1.4		211.3			636.1			1.4		627.2
Commissions	24.2			9.0		22.2			71.1			7.9		65.9
Deferral of Acquisition Costs	(12.5		)	0.8		(12.4		)	(38.6		)	2.7		(37.6		)
Amortization of Deferred Acquisition Costs	10.8			6.9		10.1			32.3			(2.4	)	33.1
Other Expenses	49.6			1.0		49.1			150.2			2.0		147.3
Total	286.4			2.2		280.3			851.1			1.8		835.9
Operating Income Before Income Tax and Net Realized Investment Gains and Losses	$	53.1		0.6		$	52.8		$	159.1		2.3		$	155.5
Operating Ratios (% of Premium Income):
Benefit Ratio	70.2		%			70.4		%	70.1		%			70.2		%
Other Expense Ratio	16.2		%			16.4		%	16.6		%			16.5		%
Before-tax Operating Income Ratio	17.4		%			17.6		%	17.5		%			17.4		%
Premium Persistency:
Group Life									87.7		%			91.8		%
Accidental Death & Dismemberment									87.8		%			90.9		%
Case Persistency:
Group Life									88.5		%			88.3		%
Accidental Death & Dismemberment									88.5		%			88.4		%

Premium income for group life and accidental death and dismemberment increased in the third quarter and first nine months of 2011 compared to the same periods of 2010 due primarily to higher sales, partially offset by lower premium persistency. Case persistency in the third quarter and first nine months of 2011 was slightly higher than the same periods of 2010. Net investment income was higher in the third quarter and first nine months of 2011 compared to the same periods of 2010 due primarily to an increase in the level of assets supporting this line of business, partially offset by a decline in the level of prepayment income on mortgage-backed securities.

The third quarter and first nine months of 2011 benefit ratios were generally consistent with the benefit ratios of the same periods of 2010. Commissions and the deferral of acquisition costs were higher in the third quarter and first nine months of 2011 compared to the same periods of 2010 due primarily to higher group life sales. The amortization of acquisition costs in the third quarter and first nine months of 2011 was generally consistent with the prior periods, with slight volatility in levels of amortization due to internal replacement transactions. The other expense ratios were generally consistent with the prior periods as we continue to manage our expense levels relative to premium levels through operating effectiveness and performance management.

55

Unum US Supplemental and Voluntary Operating Results

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

(in millions of dollars, except ratios)
	Three Months Ended September 30								Nine Months Ended September 30
	2011			% Change		2010			2011			% Change		2010
Operating Revenue
Premium Income
Individual Disability - Recently Issued	$	116.6		(0.1	)%	$	116.7		$	348.3		(0.3	)%	$	349.5
Long-term Care	152.1			1.8		149.4			453.5			1.2		448.1
Voluntary Benefits	143.6			9.7		130.9			433.5			9.6		395.7
Total Premium Income	412.3			3.9		397.0			1,235.3			3.5		1,193.3
Net Investment Income	145.7			11.9		130.2			427.3			11.6		383.0
Other Income	6.8			(10.5	)	7.6			22.3			(7.1	)	24.0
Total	564.8			5.6		534.8			1,684.9			5.3		1,600.3
Benefits and Expenses
Benefits and Change in Reserves for Future Benefits	333.6			5.3		316.9			985.8			4.8		940.4
Commissions	72.0			4.5		68.9			218.5			3.4		211.3
Deferral of Acquisition Costs	(58.2		)	5.6		(55.1		)	(177.5		)	4.4		(170.1		)
Amortization of Deferred Acquisition Costs	47.6			(12.8	)	54.6			161.9			(3.7	)	168.2
Other Expenses	75.5			0.1		75.4			232.7			4.0		223.8
Total	470.5			2.1		460.7			1,421.4			3.5		1,373.6
Operating Income Before Income Tax and Net Realized Investment Gains and Losses	$	94.3		27.3		$	74.1		$	263.5		16.2		$	226.7
Operating Ratios (% of Premium Income):
Benefit Ratios
Individual Disability - Recently Issued	52.1		%			54.3		%	52.1		%			52.8		%
Long-term Care	131.9		%			121.8		%	129.1		%			119.6		%
Voluntary Benefits	50.3		%			54.6		%	50.5		%			55.6		%
Other Expense Ratio	18.3		%			19.0		%	18.8		%			18.8		%
Before-tax Operating Income Ratio	22.9		%			18.7		%	21.3		%			19.0		%
Interest Adjusted Loss Ratios:
Individual Disability - Recently Issued	30.7		%			33.8		%	30.8		%			32.4		%
Long-term Care	86.0		%			80.9		%	84.4		%			80.1		%
Premium Persistency:
Individual Disability - Recently Issued									89.8		%			90.4		%
Long-term Care									95.7		%			95.5		%
Voluntary Benefits									79.6		%			80.6		%

Premium income in total for these product lines was higher in the third quarter and first nine months of 2011 compared to the same periods of 2010 due primarily to growth in our voluntary benefits product line. We also experienced slightly higher premium persistency for the long-term care product line, while premium persistency for the individual disability - recently issued and voluntary benefits product lines decreased. Net investment income was higher in the third quarter and first nine months of 2011 compared to the same periods of 2010 due to growth in the level of assets supporting these lines of business, partially offset by lower bond call premiums and a decline in prepayment income on mortgage-backed securities.

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The interest adjusted loss ratio for the individual disability - recently issued line of business in the third quarter and first nine months of 2011 was lower than the same periods of 2010 due to favorable claims performance. The interest adjusted loss ratio for long-term care was higher in the third quarter and first nine months of 2011 compared to the same periods of 2010 due primarily to an increase in active life reserves as a result of continued high persistency levels as well as an increase in claim incidence rates. The benefit ratio for voluntary benefits was lower in the third quarter and first nine months of 2011 compared to the same periods of 2010 due primarily to a lower average paid claim size for voluntary life and lower paid incidence and prevalence rates for voluntary disability.

The deferral of acquisition costs was higher in the third quarter and first nine months of 2011 than the same periods of 2010 due to higher sales. The amortization of deferred acquisition costs was lower in the third quarter and first nine months of 2011 compared to the same periods of 2010 due to favorable premium persistency relative to assumptions for certain issue years within certain of our product lines as well as prospective unlocking for favorable mortality experience relative to assumptions for our interest-sensitive voluntary life products. The other expense ratio in the third quarter of 2011 was lower than the same period of 2010 and for the first nine months of 2011 was consistent with the prior year as we continue our focus on expense management.

In late 2010, we began a process of filing requests with various state insurance departments for a rate increase on certain of our individual long-term care policies. The rate increase reflects current interest rates, higher expected future claims, persistency, experience, and other factors related to pricing individual long-term care coverage.  In states for which a rate increase is submitted and approved, customers are also given options for coverage changes or other approaches that might fit their current financial and insurance needs. Higher premium income associated with the rate increase is expected to begin to emerge during 2012. As of September 30, 2011, 35 states had accepted our request for a rate increase.

Segment Outlook

Although we experienced premium and sales growth during the third quarter and first nine months of 2011, we believe that premium and sales growth, particularly growth in existing customer accounts, will continue to be pressured by ongoing high levels of unemployment and the competitive environment. Opportunities for premium and sales growth are expected to re-emerge as the economy improves and employment growth resumes. We expect some volatility in net investment income to continue during the remainder of 2011 as a result of fluctuations in bond calls and other types of miscellaneous net investment income. We intend to continue to manage our expense levels relative to premium levels through operating effectiveness and performance management.

Periods of economic downturns have historically affected disability claim incidence rates and, to a lesser extent, disability claim recovery rates in certain sectors of the market. Certain risks and uncertainties are inherent in disability business. Components of claims experience, such as incidence and recovery rates, may be worse than we expect. Disability claim incidence and claim recovery rates may be influenced by, among other factors, the rate of unemployment and consumer confidence. Within the group disability market, pricing and renewal actions can be taken to react to higher claim rates, but these actions take time to implement, and there is a risk that the market will not sustain increased prices. In addition, changes in economic and external conditions may not manifest themselves in claims experience for an extended period of time. The current economic conditions may lead to a higher rate of claim incidence, lower levels of claim recoveries, or lower claim discount rates. We have previously taken steps to improve our risk profile, including reducing our exposure to volatile business segments through diversification by market size, product segment, and industry segment. We believe our claims management organization is positioned for stable and sustainable performance levels. We are uncertain as to whether the higher claim incidence experienced in the third quarter of 2011, along with the general increasing trend experienced throughout the first nine months of 2011, was due to the normal volatility that occurs in our group disability business or was related to the economy. As a result of the continued decline in interest rates, during the third quarter of 2011, we lowered our claim discount rate for new claim incurrals in group disability. We are contemplating price increases for our group disability products during 2012 as a result of higher claim incidence and a lower claim discount rate.

Profitability of our long-term care products is affected by claims experience, investment returns, and persistency.  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 long-term care reserve levels. 

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

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opportunity based on employee choice, defined employer funding, simple administration, and effective communication. We intend to maintain our discipline and will continue (i) directing the majority of our investments to capture opportunities emerging in our core group and voluntary markets to grow them at above-market rates, (ii) focusing on margins in large case group insurance, while leveraging core market, voluntary, and other shorter-term investments to grow at market rates, and (iii) seeking opportunities to improve margins and return in our supplemental lines of business. We believe we are well positioned strategically in our markets and that opportunities for continued disciplined growth exist in our group core market segment and in the voluntary markets. While the current economic conditions have impacted our ability to grow premium income and will continue to do so until we return to a more normal economic environment, we expect to achieve marginal year over year growth in our premium income during the remainder of 2011. We anticipate that the benefit ratio in our group disability product line may remain elevated, dependent 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.

We intend to begin offering group dental benefits through a partnership with United Concordia, beginning with an initial launch in a selected market during the fourth quarter of 2011, with additional markets added throughout 2012. The product offering will include flexible plan designs aligned with our other employer-sponsored benefit coverages and will be targeted to the group core market segment.

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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. Certain reclassifications have been made to prior year amounts in order to conform to the current year presentation.

(in millions of dollars, except ratios)
	Three Months Ended September 30								Nine Months Ended September 30
	2011			% Change		2010			2011			% Change		2010
Operating Revenue
Premium Income
Group Long-term Disability	$	107.3		5.4	%	$	101.8		$	318.3		2.4	%	$	310.7
Group Life	52.1			17.1		44.5			151.6			19.6		126.8
Supplemental and Voluntary	16.1			6.6		15.1			48.5			13.8		42.6
Total Premium Income	175.5			8.7		161.4			518.4			8.0		480.1
Net Investment Income	43.3			11.0		39.0			139.3			14.3		121.9
Other Income	—			(100.0	)	0.2			0.1			(90.9	)	1.1
Total	218.8			9.1		200.6			657.8			9.1		603.1
Benefits and Expenses
Benefits and Change in Reserves for Future Benefits	138.3			28.1		108.0			376.8			20.2		313.5
Commissions	11.0			(6.0	)	11.7			33.3			4.4		31.9
Deferral of Acquisition Costs	(7.3		)	9.0		(6.7		)	(21.2		)	3.4		(20.5		)
Amortization of Deferred Acquisition Costs	7.4			7.2		6.9			22.0			8.4		20.3
Other Expenses	34.5			3.0		33.5			108.6			11.7		97.2
Total	183.9			19.9		153.4			519.5			17.4		442.4
Operating Income Before Income Tax and Net Realized Investment Gains and Losses	$	34.9		(26.1	)	$	47.2		$	138.3		(13.9	)	$	160.7
Operating Ratios (% of Premium Income):
Benefit Ratio	78.8		%			66.9		%	72.7		%			65.3		%
Other Expense Ratio	19.7		%			20.8		%	20.9		%			20.2		%
Before-tax Operating Income Ratio	19.9		%			29.2		%	26.7		%			33.5		%
Persistency:
Group Long-term Disability									87.1		%			91.2		%
Group Life									88.7		%			92.5		%
Supplemental and Voluntary									87.8		%			88.7		%

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Foreign Currency Translation

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

Fluctuations in the pound to dollar exchange rate have an effect on Unum UK's reported financial results and our consolidated financial results. In periods when the pound strengthens relative to the preceding period, as occurred in the third quarter and first nine months of 2011 compared to the same periods of 2010, translating pounds into dollars increases current period results relative to the prior period. In periods when the pound weakens relative to the preceding period, translating into dollars decreases current period results relative to the prior periods.

(in millions of pounds, except ratios)
	Three Months Ended September 30								Nine Months Ended September 30
	2011			% Change		2010			2011			% Change		2010
Operating Revenue
Premium Income
Group Long-term Disability	£	66.6		1.4	%	£	65.7		£	197.1		(2.6	)%	£	202.4
Group Life		32.4		12.9			28.7			93.9		13.7			82.6
Supplemental and Voluntary		10.1		4.1			9.7			30.1		8.7			27.7
Total Premium Income		109.1		4.8			104.1			321.1		2.7			312.7
Net Investment Income		26.9		6.7			25.2			86.2		8.4			79.5
Other Income		—		—			—			0.1		(85.7	)		0.7
Total		136.0		5.2			129.3			407.4		3.7			392.9
Benefits and Expenses
Benefits and Change in Reserves for Future Benefits		85.8		23.1			69.7			233.3		14.3			204.1
Commissions		6.8		(10.5	)		7.6			20.6		(1.0	)		20.8
Deferral of Acquisition Costs		(4.6	)	7.0			(4.3	)		(13.2	)	(1.5	)		(13.4	)
Amortization of Deferred Acquisition Costs		4.6		4.5			4.4			13.7		3.8			13.2
Other Expenses		21.7		0.9			21.5			67.4		6.3			63.4
Total		114.3		15.6			98.9			321.8		11.7			288.1
Operating Income Before Income Tax and Net Realized Investment Gains and Losses	£	21.7		(28.6	)	£	30.4		£	85.6		(18.3	)	£	104.8
Weighted Average Pound/Dollar Exchange Rate		1.608					1.553			1.616					1.533

Premium income was higher in the third quarter and first nine months of 2011 compared to the same periods of 2010, although premium growth continues to be pressured by pricing actions resulting from the competitive U.K. market. The year-to-date 2011 growth in group life was due primarily to an increase in the inforce block of business from prior year sales. Persistency, although below the level of 2010, remains strong. Net investment income was higher in the third quarter and first nine months of 2011 compared to the same periods of 2010 due primarily to an increase in the level of assets supporting this business segment and higher returns from inflation index-linked bonds.

The benefit ratio was higher in the third quarter and first nine months of 2011 compared to the same periods of 2010 due to unfavorable risk experience in group long-term disability, with third quarter variability driven primarily by an increase in the average size and severity of new claims in the third quarter of 2011 relative to the same period of last year. The unfavorable benefit ratio for group disability in the first nine months of 2011 compared to the same period of 2010 was driven primarily by the impact of higher inflation on claim reserves associated with disability policies containing an inflation-linked benefit increase feature as well as a lower level of claims resolutions during the first nine months of 2011 compared to the same period of last year. Claim incidence for the first nine months of 2011 was favorable to the comparable period of last year. We invest in index-linked bonds to match the claim reserves associated with group policies that provide for inflation-linked increases in

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benefits. Although over the intermediate-term the investment return from index-linked bonds generally matches the index-linked claim payments and reserves, the effect on investment income from the inflation index-linked bonds may not be completely offset by a similar change in claim payments and reserves in each quarterly period.

Commissions and the deferral and amortization of acquisition costs during the third quarter and first nine months of 2011 were generally consistent with the levels of 2010. Other expenses in the third quarter of 2011 were consistent with the third quarter of 2010 but for the first nine months of 2011, other expenses were higher than the comparable prior year period due to elevated development and marketing expenditures related to Unum UK's growth plans. The other expense ratio in the third quarter and first nine months of 2011, as compared to the same periods of 2010, was favorably impacted by higher premium income.

Sales

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

(in millions)
	Three Months Ended September 30						Nine Months Ended September 30
	2011		% Change		2010		2011		% Change		2010
Group Long-term Disability	$	9.9	(27.2	)%	$	13.6	$	30.7	(21.3	)%	$	39.0
Group Life		9.0	(35.7	)		14.0		25.5	(37.8	)		41.0
Supplemental and Voluntary		2.4	20.0			2.0		6.4	(3.0	)		6.6
Total Sales	$	21.3	(28.0	)	$	29.6	$	62.6	(27.7	)	$	86.6
Group Long-term Disability	£	6.1	(30.7	)%	£	8.8	£	19.0	(25.5	)%	£	25.5
Group Life		5.7	(36.7	)		9.0		15.8	(40.8	)		26.7
Supplemental and Voluntary		1.5	15.4			1.3		4.0	(7.0	)		4.3
Total Sales	£	13.3	(30.4	)	£	19.1	£	38.8	(31.3	)	£	56.5

Sales in Unum UK's group long-term disability and group life product lines were lower in the third quarter and first nine months of 2011 compared to the same periods of 2010 due to a decline in sales in both the core market, which we define for Unum UK as employee groups with fewer than 500 lives, and in the large case market. These declines were partially offset by higher sales to existing customers. Sales in the supplemental and voluntary line of business were generally consistent in the third quarter and first nine months of 2011 compared to the same periods of 2010.

Segment Outlook

The challenging economic and competitive pricing environment in the U.K. continue to negatively impact Unum UK's premium growth, and we expect this may continue in the near term if current economic and competitive conditions in the U.K. persist. Our sales growth may also be impacted by a prolonged competitive pricing environment in the U.K. We expect volatility in net investment income to continue during the remainder of 2011 as a result of fluctuations in bond calls and the level of inflation. The level of disability claim incidence in the first nine months of 2011 is favorable relative to the same period of 2010, but our claim resolutions are unfavorable relative to the first nine months of 2010 due in part to a lower level of early duration claims and the impact of the economic environment on our ability to resolve claims. The current economic conditions may lead to a higher rate of claim incidence, lower levels of claim recoveries, or lower claim discount rates. We are contemplating price increases for our group disability products during 2012 should unfavorable risk trends persist and long-term interest rates remain at historically low levels. We continuously monitor key indicators to assess our risks and attempt to adjust our business plans accordingly. Continued fluctuations in the U.S. dollar relative to the British pound sterling impact our reported operating results.

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

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In the current competitive pricing market and economic environment, we continue to have a cautious outlook for premium growth for the remainder of 2011. We anticipate returning to more normalized levels of premium growth through stable persistency and price increases, as well as increased sales to existing and new customers which we expect to occur commensurate with the timing of the U.K. economic recovery. We expect our full year 2011 benefit ratio to be unfavorable to 2010. The impact of higher inflation on certain of our policies' claim reserves may also negatively impact year over year comparisons. We expect our 2011 profit margins to continue at a favorable level, although below the level of 2010.

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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 agency sales force and brokers.

Operating Results

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

(in millions of dollars, except ratios)
	Three Months Ended September 30								Nine Months Ended September 30
	2011			% Change		2010			2011			% Change		2010
Operating Revenue
Premium Income
Accident, Sickness, and Disability	$	174.3		4.9	%	$	166.1		$	519.7		5.4	%	$	493.1
Life	47.0			8.3		43.4			140.0			6.9		131.0
Cancer and Critical Illness	62.4			4.3		59.8			186.4			4.7		178.0
Total Premium Income	283.7			5.3		269.3			846.1			5.5		802.1
Net Investment Income	32.5			1.9		31.9			99.6			9.3		91.1
Other Income	0.1			(50.0	)	0.2			0.4			(20.0	)	0.5
Total	316.3			4.9		301.4			946.1			5.9		893.7
Benefits and Expenses
Benefits and Change in Reserves for Future Benefits	149.1			11.0		134.3			437.5			12.6		388.5
Commissions	61.8			3.9		59.5			183.5			6.9		171.7
Deferral of Acquisition Costs	(62.9		)	0.6		(62.5		)	(189.9		)	4.3		(182.1		)
Amortization of Deferred Acquisition Costs	44.4			2.1		43.5			139.3			1.0		137.9
Other Expenses	53.6			2.9		52.1			161.2			3.1		156.3
Total	246.0			8.4		226.9			731.6			8.8		672.3
Operating Income Before Income Tax and Net Realized Investment Gains and Losses	$	70.3		(5.6	)	$	74.5		$	214.5		(3.1	)	$	221.4
Operating Ratios (% of Premium Income):
Benefit Ratio	52.6		%			49.9		%	51.7		%			48.4		%
Other Expense Ratio	18.9		%			19.3		%	19.1		%			19.5		%
Before-tax Operating Income Ratio	24.8		%			27.7		%	25.4		%			27.6		%
Persistency:
Accident, Sickness, and Disability									73.7		%			76.4		%
Life									85.3		%			85.8		%
Cancer and Critical Illness									84.0		%			85.0		%

Premium income was higher in the third quarter and first nine months of 2011 compared to the same periods of 2010 due primarily to prior period sales growth and stable persistency for the life and cancer and critical illness lines of business, partially offset by lower persistency for the accident, sickness, and disability line of business. Although we experienced premium growth in 2011, the growth rate continues to be negatively impacted by economic conditions. Net investment income was higher in the third quarter of 2011 compared to the same period of 2010 due primarily to growth in the level of assets, partially offset by lower bond call premiums. Net investment income was higher in the first nine months of 2011 compared to the same period of 2010 due primarily to an increase in bond call premiums and growth in the level of assets.

The overall benefit ratio was higher in the third quarter and first nine months of 2011 compared tothe same periods of 2010 due to less favorable risk results in the accident, sickness, and disability product line and in the cancer and critical illness product line. Risk results in the life product line were favorable in the third quarter of 2011 compared to the same period of

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2010 due to favorable mortality experience and were consistent in the first nine months of 2011 compared to the same period of 2010.  Accident, sickness, and disability risk results were less favorable in the third quarter of 2011 compared to the same period of 2010 due to a higher level of incurred claims in our accident product line and were less favorable in the first nine months of 2011 compared to the same period of 2010 due to a higher level of incurred claims in both the accident and disability product lines.  The benefit ratio for the cancer and critical illness line of business was unfavorable in the third quarter of 2011 and slightly higher for the first nine months of 2011 compared to the prior year periods due to an increased level of cancer claims in the older block of cancer products, primarily during the third quarter of 2011.

Commissions and the deferral of acquisition costs were both higher in the third quarter and first nine months of 2011 compared to the same periods of 2010 due primarily to an increase in costs related to growth in new business premium. The amortization of deferred acquisition costs continues to increase as the level of the deferred asset grows. The other expense ratio was lower in the third quarter and first nine months of 2011 compared to the same periods of 2010 due primarily to higher premium income and a continued focus on expense management.

Sales

(in millions of dollars)
	Three Months Ended September 30						Nine Months Ended September 30
	2011		% Change		2010		2011		% Change		2010
Accident, Sickness, and Disability	$	55.9	4.3	%	$	53.6	$	161.5	2.0	%	$	158.4
Life	14.4		(2.0	)	14.7		42.7		(4.7	)	44.8
Cancer and Critical Illness	12.9		7.5		12.0		35.3		2.9		34.3
Total Sales	$	83.2	3.6		$	80.3	$	239.5	0.8		$	237.5

Colonial Life's sales were higher in the third quarter and first nine months of 2011 compared to the same periods of 2010. New account sales were 5.2 percent and 2.8 percent higher than the third quarter and first nine months of 2010, and existing account sales were 2.6 percent higher and 0.4 percent lower than the third quarter and first nine months of 2010. Commercial market sales were 6.0 percent and 0.5 percent higher in the third quarter and first nine months of 2011 compared to the same periods of 2010, driven primarily by sales increases of 7.1 percent and 2.8 percent in the core commercial market segment, which we define as accounts with fewer than 1,000 lives. Sales in the large case commercial market segment decreased 1.2 percent and 13.3 percent in the third quarter and first nine months of 2011 compared to the same periods of 2010. In the public sector market, sales were 4.3 percent lower and 2.3 percent higher in the third quarter and first nine months of 2011 compared to the same periods of 2010. Sales results for 2011 were also unfavorably impacted by our decision to discontinue selling our limited benefit medical product during 2011. The number of new accounts added in the third quarter and first nine months of 2011 was 1.8 percent and 3.0 percent lower than the same periods of 2010. The average new case size was 7.2 percent and 6.0 percent higher for the third quarter and first nine months of 2011 relative to comparable periods of 2010.

Segment Outlook

Our premium growth in the first nine months of 2011 was in line with the level of growth in the same period of 2010 and is below the level of our long-term growth expectations. We believe slower sales and premium growth levels may continue in the near term if the current economic conditions persist and continue to affect employment growth, the buying patterns of employees, and the deferral by employers of the introduction of new employee benefit plans. We expect volatility in net investment income to continue during the remainder of 2011 as a result of fluctuations in bond calls and other types of miscellaneous net investment income. Periods of economic downturns have historically had minimal impact on the risk results of Colonial Life, due primarily to a diversified product portfolio that is designed with short duration, indemnity benefits.  We continuously monitor key indicators to assess our risks and attempt to adjust our business plans accordingly.

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

During the remainder of 2011, we expect premium growth to be modest relative to our long-term outlook. We believe that strong profit margins will continue, although we expect our overall benefit ratio to be higher than the level of 2010. We believe premium growth will re-accelerate as the economy improves and employment growth resumes.

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Individual Disability – Closed Block Segment

The Individual Disability - Closed Block segment generally consists of those individual disability policies in-force before the substantial changes in product offerings, pricing, distribution, and underwriting, which generally occurred during the period 1994 through 1998. A small amount of new business continued to be sold after these changes, but we stopped selling new policies in this segment at the beginning of 2004 other than update features contractually allowable on existing policies.

Operating Results

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

(in millions of dollars, except ratios)
	Three Months Ended September 30								Nine Months Ended September 30
	2011			% Change		2010			2011			% Change		2010
Operating Revenue
Premium Income	$	196.4		(5.8	)%	$	208.5		$	595.0		(6.3	)%	$	635.0
Net Investment Income	181.9			(1.9	)	185.5			544.2			(3.4	)	563.5
Other Income	23.6			4.0		22.7			67.9			0.9		67.3
Total	401.9			(3.6	)	416.7			1,207.1			(4.6	)	1,265.8
Benefits and Expenses
Benefits and Change in Reserves for Future Benefits	345.7			(4.2	)	360.8			1,043.5			(4.3	)	1,090.0
Commissions	11.8			(7.8	)	12.8			35.8			(8.9	)	39.3
Interest and Debt Expense	2.6			(16.1	)	3.1			7.9			(11.2	)	8.9
Other Expenses	27.8			(7.9	)	30.2			85.6			(8.6	)	93.7
Total	387.9			(4.7	)	406.9			1,172.8			(4.8	)	1,231.9
Operating Income Before Income Tax and Net Realized Investment Gains and Losses	$	14.0		42.9		$	9.8		$	34.3		1.2		$	33.9
Interest Adjusted Loss Ratio	84.9		%			85.5		%	84.6		%			85.1		%
Operating Ratios (% of Premium Income):
Other Expense Ratio	14.2		%			14.5		%	14.4		%			14.8		%
Before-tax Operating Income Ratio	7.1		%			4.7		%	5.8		%			5.3		%
Premium Persistency									92.6		%			93.5		%

The decrease in premium income in the third quarter and first nine months of 2011 compared to the same periods of 2010 is due to the expected run-off of this block of closed business driven by expected policy terminations and maturities. Net investment income was lower in the third quarter and first nine months of 2011 compared to the same periods of 2010 due to a decrease in bond call premiums, a decline in prepayment income on mortgage-backed securities, and a decrease in the level of assets.

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, increased in the third quarter and first nine months of 2011 compared to the same periods of 2010 due to higher investment income in the portfolios held by the ceding companies.

The interest adjusted loss ratio for the third quarter and first nine months of 2011 was lower than the comparable periods of 2010 due primarily to favorable mortality experience. The interest adjusted loss ratio for the first nine months of 2011 was lower than the same period of 2010 due primarily to favorable mortality experience. Interest and debt expense in the third quarter and first nine months of 2011 was lower than the same periods of 2010 due to lower interest rates on our floating rate debt issued by Northwind Holdings as well as a decline in the amount of outstanding debt as a result of principal repayments. The other expense ratio was favorable in the third quarter and first nine months of 2011 compared to the same periods of 2010 due to lower litigation costs and lower expenses related to claim volumes, partially offset by lower premium income.

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Segment Outlook

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

We expect that operating revenue and income will continue to decline over time as this closed block of business winds down. We believe that the interest adjusted loss ratio for this block of business will be relatively flat over the long term, but the segment may experience quarterly volatility. Claim resolution rates, which measure the resolution of claims from recovery, deaths, settlements, and benefit expirations, are very sensitive to operational and environmental changes and can be volatile. Our claim resolution rate assumption used in determining reserves is our expectation of the resolution rate we will experience over the life of the block of business and will vary from actual experience in any one period. It is possible that variability in our reserve assumptions could result in a material impact on our reserve levels.

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Corporate and Other Segment

The Corporate and Other 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. Corporate and Other also includes results from certain Unum US insurance products not actively marketed, including individual life and corporate-owned life insurance, reinsurance pools and management operations, group pension, health insurance, and individual annuities. We expect operating revenue and income resulting from these insurance products to decline over time as these business lines wind down.

Operating Results

(in millions of dollars)
	Three Months Ended September 30								Nine Months Ended September 30
	2011			% Change		2010			2011			% Change		2010
Operating Revenue
Premium Income	$	(0.9	)	N.M.		$	0.4		$	(0.3	)	(110.7	)%	$	2.8
Net Investment Income	39.1			(20.4	)	49.1			118.8			(20.0	)	148.5
Other Income	5.0			(7.4	)	5.4			15.3			(19.5	)	19.0
Total	43.2			(21.3	)	54.9			133.8			(21.4	)	170.3
Benefits and Expenses
Benefits and Change in Reserves for Future Benefits	19.6			(8.8	)	21.5			58.9			(4.7	)	61.8
Commissions	(0.2		)	(150.0	)	0.4			0.3			(62.5	)	0.8
Interest and Debt Expense	32.2			1.3		31.8			99.4			7.0		92.9
Other Expenses	13.1			9.2		12.0			35.2			(32.4	)	52.1
Total	64.7			(1.5	)	65.7			193.8			(6.6	)	207.6
Operating Loss Before Income Tax and Net Realized Investment Gains and Losses	$	(21.5	)	(99.1	)	$	(10.8	)	$	(60.0	)	(60.9	)	$	(37.3	)
N.M. = not a meaningful percentage

Non-Insurance Product Results

Operating revenue was $15.5 million and $47.4 million in the third quarter and first nine months of 2011 compared to $25.0 million and $76.1 million in the same periods of 2010. Operating losses were $28.8 million and $83.6 million in the third quarter and first nine months of 2011 compared to $17.1 million and $47.2 million in the same periods of 2010.

The decrease in operating revenue in the third quarter and first nine months of 2011 compared to the same periods of 2010 is due to a decline in net investment income resulting from lower short-term interest rates and our investments in low-income housing tax credit partnerships. The negative impact on net investment income and operating income by segment from our increased level of investment in low-income housing tax credit partnerships is offset by a lower income tax rate due to the tax benefits recognized as a result of these investments.

The increased operating loss in the third quarter and first nine months of 2011 compared to the same periods of 2010 was due primarily to the lower level of net investment income and higher interest and debt expense. Interest and debt expense increased in the first nine months of 2011 relative to the same period of 2010 due primarily to the September 2010 issuance of $400.0 million of 5.625% senior notes, partially offset by the maturity of our $225.1 million 7.625% senior notes in March 2011. We experienced lower interest in the third quarter and first nine months of 2011 compared to the same periods of 2010 on our $350.0 million 7.125% unsecured senior notes which we effectively converted into floating rate debt through the use of an interest rate swap entered into during the fourth quarter of 2010.

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Insurance Product Results

Operating revenue for our insurance products was $27.7 million and $86.4 million in the third quarter and first nine months of 2011 compared to $29.9 million and $94.2 million in the same periods of 2010. These closed lines of business had operating income of $7.3 million and $23.6 million in the third quarter and first nine months of 2011 compared to $6.3 million and $9.9 million in the third quarter and first nine months of 2010. The higher operating income for the first nine months of 2011 relative to last year's comparable periods was due primarily to a decline in litigation costs during 2011 relative to the prior year.

Segment Outlook

Our investment portfolio quality remains very strong, with low default experience during the first nine months of 2011. 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 strong statutory earnings. While we intend to maintain our disciplined approach to risk management throughout the remainder of 2011, we believe we are well positioned wherein we have substantial flexibility to preserve our capital strength and at the same time explore opportunities to deploy the excess capital that is generated each period.

Interest and debt expense for 2011 is expected to remain generally consistent with the level of 2010 due to the $225.1 million of debt which matured during the first quarter of 2011 and no expected issuances of new debt in 2011. We expect 2011 litigation costs to remain below the elevated level of 2010, and 2011 pension expenses are expected to remain generally consistent with the level of 2010.

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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 between our different lines of business, when necessary, to adjust the cash flow and/or duration of the asset portfolios to better match the cash flow and duration of the liability portfolios. Asset and liability portfolio modeling is updated on a quarterly basis and is used as part of the overall interest rate risk management strategy. Cash flows from the in-force asset and liability portfolios are projected at current interest rate levels and also at levels reflecting an increase and a decrease in interest rates to obtain a range of projected cash flows under the different interest rate scenarios.  These results enable us to assess the impact of projected changes in cash flows and duration resulting from potential changes in interest rates. Testing the asset and liability portfolios under various interest rate scenarios enables us to choose the most appropriate investment strategy as well as to limit the risk of disadvantageous outcomes. We use this analysis in determining hedging strategies and utilizing derivative financial instruments for managing interest rate risk and the risk related to matching duration for our assets and liabilities. We do not use derivative financial instruments for speculative purposes.

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

We have no exposure to subprime mortgages, “Alt-A” loans, or collateralized debt obligations in our asset-backed, mortgage-backed securities, or public bond portfolios. At September 30, 2011, 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. We held $307.9 million fair value ($337.4 million amortized cost) of perpetual debentures, or “hybrid” securities, that generally have no fixed maturity date. Interest on these securities due on any payment date may be deferred by the issuer. The interest payments are generally deferrable only to the extent that the issuer has suspended dividends or other distributions or payments to any of its shareholders or any other perpetual debt instrument.

For information on our valuation of investments and our formal investment policy, including our overall quality and diversification objectives, see “Critical Accounting Estimates” and “Investments” in Part II, Item 7 of our annual report on Form 10-K for the year ended December 31, 2010.

Investment Results

Net investment income increased 1.7 percent and 1.3 percent in the third quarter and first nine months of 2011 relative to the same periods of 2010 due primarily to continued growth in the level of invested assets and higher bond call premiums, partially offset by an increase in the amortization of the principal amount invested in our tax credit partnerships.

The duration weighted book yield on the fixed income securities in our investment portfolio was 6.68 percent as of September 30, 2011 compared to a yield of 6.71 percent as of December 31, 2010. As previously noted, we actively manage our asset and liability cash flow match and our asset and liability duration match to limit interest rate risk. Duration is a measure of the percentage change in the fair values of assets and liabilities for a given change in interest rates. Cash flows from the in-force asset and liability portfolios are projected at current interest rate levels and also at levels reflecting an increase and a decrease in interest rates to obtain a range of projected cash flows under the different interest rate scenarios.  These results enable us to assess the impact of projected changes in cash flows and duration resulting from potential changes in interest rates.

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To assess the impact of a duration mismatch, we measure the potential changes in estimated fair value based on a hypothetical change in interest rates to quantify a dollar value change. Although we test the asset and liability portfolios under various interest rate scenarios as part of our modeling, the majority of our liabilities related to insurance contracts are not interest rate sensitive, and we therefore have minimal exposure to policy withdrawal risk. Our determination of investment strategy relies more on long-term measures such as reserve adequacy analysis and the relationship between the portfolio yields supporting our various product lines and the aggregate discount rates embedded in the reserves.

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

(in millions of dollars)
	Three Months Ended September 30						Nine Months Ended September 30
	2011			2010			2011			2010
Fixed Maturity Securities
Gross Gains on Sales	$	14.8		$	6.0		$	33.0		$	35.4
Gross Losses on Sales	(5.4		)	(4.1		)	(22.1		)	(25.8		)
Other-Than-Temporary Impairment Loss	(1.2		)	—			(4.2		)	(10.4		)
Mortgage Loans and Other Invested Assets
Gross Gains on Sales	1.6			0.3			7.1			6.9
Gross Losses on Sales	—			—			(0.2		)	(0.5		)
Impairment Loss	(0.4		)	(0.4		)	(0.4		)	(2.1		)
Foreign Currency Transactions	0.4			(2.3		)	(1.1		)	(2.6		)
Embedded Derivative in Modified Coinsurance Arrangement	(33.7		)	1.6			(24.4		)	(3.7		)
Net Realized Investment Gain (Loss)	$	(23.9	)	$	1.1		$	(12.3	)	$	(2.8	)

We had no individual realized investment losses of $10.0 million or greater from other-than-temporary impairments during the third quarter or first nine months of 2011 and no individual realized investment losses of $10.0 million or greater from the sale of fixed-maturity securities during the third quarter or first nine months of 2011 or 2010. During the first nine months of 2010, we recognized an other-than-temporary impairment loss of $10.2 million on securities issued by a Netherlands financial services company.  The company recorded significant impairment losses in its securities and real estate portfolios during 2009 and 2008 and required a significant amount of government aid. At the time of the impairment loss, these securities had been in an unrealized loss position for a period of greater than three years.

We report changes in the fair value of an embedded derivative in a modified coinsurance arrangement as realized investment gains and losses, as required under the provisions of GAAP. GAAP requires us to include in our realized investment gains and losses a calculation intended to estimate the value of the option of our reinsurance counterparty to cancel the reinsurance contract with us. However, neither party can unilaterally terminate the reinsurance agreement except in extreme circumstances resulting from regulatory supervision, delinquency proceedings, or other direct regulatory action. Cash settlements or collateral related to this embedded derivative are not required at any time during the reinsurance contract or at termination of the reinsurance contract, and any accumulated embedded derivative gain or loss reduces to zero over time as the reinsured business winds down. We therefore view the effect of realized gains and losses recognized for this embedded derivative as a reporting requirement that will not result in a permanent change in assets or stockholders' equity.

The change in fair value of this embedded derivative recognized as a realized gain or loss during the first nine months of 2011 and 2010 resulted primarily from a change in credit spreads in the overall investment market. The fair value of this embedded derivative was $(120.7) million at September 30, 2011, compared to $(96.3) million at December 31, 2010, and is reported in other liabilities in our consolidated balance sheets.

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Fixed Maturity Securities

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

Fixed Maturity Securities - By Industry Classification

As of September 30, 2011

(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	$	2,261.6	$	183.2	$	378.3	$	27.1	$	1,883.3	$	210.3
Capital Goods	3,679.0		465.1		442.9		48.5		3,236.1		513.6
Communications	2,806.7		372.2		273.2		24.0		2,533.5		396.2
Consumer Cyclical	1,190.0		127.1		161.3		13.3		1,028.7		140.4
Consumer Non-Cyclical	5,381.7		827.6		358.1		18.7		5,023.6		846.3
Energy (Oil & Gas)	3,616.7		596.9		112.6		5.5		3,504.1		602.4
Financial Institutions	3,314.8		84.2		1,080.5		88.7		2,234.3		172.9
Mortgage/Asset-Backed	3,147.0		382.6		116.3		3.9		3,030.7		386.5
Sovereigns	1,474.7		220.4		—		—		1,474.7		220.4
Technology	810.0		111.9		110.9		4.0		699.1		115.9
Transportation	1,315.3		230.5		37.3		1.3		1,278.0		231.8
U.S. Government Agencies and Municipalities	2,880.0		520.7		100.8		4.3		2,779.2		525.0
Utilities	10,500.7		1,564.9		286.5		28.6		10,214.2		1,593.5
Redeemable Preferred Stocks	56.5		0.7		21.1		1.7		35.4		2.4
Total	$	42,434.7	$	5,688.0	$	3,479.8	$	269.6	$	38,954.9	$	5,957.6

The following two tables show the length of time our investment-grade and below-investment-grade fixed maturity securities had been in a gross unrealized loss position as of September 30, 2011 and at the end of the prior four quarters. The relationships of the current fair value to amortized cost are not necessarily indicative of the fair value to amortized cost relationships for the securities throughout the entire time that the securities have been in an unrealized loss position nor are they necessarily indicative of the relationships after September 30, 2011.

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Unrealized Loss on Investment-Grade Fixed Maturity Securities

Length of Time in Unrealized Loss Position

(in millions of dollars)
	2011						2010
	September 30		June 30		March 31		December 31		September 30
Fair Value < 100% >= 70% of Amortized Cost
<= 90 days	$	38.9	$	16.7	$	14.8	$	93.2	$	5.9
> 90 <= 180 days	14.1		2.9		82.4		16.9		7.2
> 180 <= 270 days	—		39.7		14.5		1.9		0.9
> 270 days <= 1 year	24.6		14.8		1.6		—		0.3
> 1 year <= 2 years	11.4		2.6		1.5		2.0		2.4
> 2 years <= 3 years	1.8		2.4		9.6		24.4		17.5
> 3 years	28.1		42.2		37.2		43.3		37.9
Sub-total	118.9		121.3		161.6		181.7		72.1
Fair Value < 70% >= 40% of Amortized Cost
> 1 year <= 2 years	—		—		—		—		2.4
> 2 years <= 3 years	—		3.3		3.4		3.2		—
> 3 years	27.1		11.1		11.9		—		—
Sub-total	27.1		14.4		15.3		3.2		2.4
Total	$	146.0	$	135.7	$	176.9	$	184.9	$	74.5

Unrealized Loss on Below-Investment-Grade Fixed Maturity Securities

Length of Time in Unrealized Loss Position

(in millions of dollars)
	2011						2010
	September 30		June 30		March 31		December 31		September 30
Fair Value < 100% >= 70% of Amortized Cost
<= 90 days	$	39.5	$	3.9	$	5.2	$	5.1	$	0.5
> 90 <= 180 days	15.6		0.7		4.0		0.1		1.9
> 180 <= 270 days	1.6		4.6		0.1		4.1		—
> 270 days <= 1 year	6.7		0.1		3.1		—		—
> 1 year <= 2 years	13.7		3.5		—		—		1.5
> 2 years <= 3 years	0.3		5.3		5.1		14.0		28.9
> 3 years	35.2		18.0		23.3		28.8		28.5
Sub-total	112.6		36.1		40.8		52.1		61.3
Fair Value < 70% >= 40% of Amortized Cost
> 180 <= 270 days	0.7		—		—		—		—
> 3 years	10.3		0.4		0.4		0.4		1.7
Sub-total	11.0		0.4		0.4		0.4		1.7
Total	$	123.6	$	36.5	$	41.2	$	52.5	$	63.0

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The following table shows our fixed maturity securities with a gross unrealized loss of $10.0 million or greater, by industry type.

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

As of September 30, 2011

(in millions of dollars)
Classification	Fair Value		Gross Unrealized Loss		Number of Issuers
Investment-Grade
Financial Institutions	$	234.8	$	44.2	3
Below-Investment-Grade
Capital Goods	$	49.5	$	10.1	1

We held one security at September 30, 2011 with a gross unrealized loss of $20.0 million or greater. The security is an investment-grade security issued by a U.K. financial institution with a fair value of $91.1 million and a gross unrealized loss of $22.6 million. The security has been in a loss position for a period of greater than three years. The decline in the fair value of the company's securities is primarily the result of the slowdown in the economy. The company is well diversified and has global market operations in capital markets, asset-backed securities, wealth management, asset management, commodities, and insurance. The company has avoided direct government support and its core Tier 1 capital ratio is strong.  The company comfortably passed the recent regulatory capital stress test and has very little exposure to Greece, Ireland, and Portugal.  The company continues to reduce its debt and improve its liquidity. Based on these factors, we believe the decline in fair value of this security is temporary. We do not intend to sell this security or believe it is more likely than not we will be required to sell this security before recovery of the amortized cost.

At September 30, 2011, our mortgage/asset-backed securities had an average life of 4.28 years, effective duration of 3.80 years, and a weighted average credit rating of AAA. The mortgage/asset-backed securities are valued on a monthly basis using valuations supplied by the brokerage firms that are dealers in these securities as well as independent pricing services. One of the risks involved in investing in mortgage/asset-backed securities is the uncertainty of the timing of cash flows from the underlying loans due to prepayment of principal with the possibility of reinvesting the funds in a lower interest rate environment. We use models which incorporate economic variables and possible future interest rate scenarios to predict future prepayment rates. The timing of prepayment cash flows may also cause volatility in our recognition of investment income. We recognize investment income on these securities using a constant effective yield based on projected prepayments of the underlying loans and the estimated economic life of the securities.  Actual prepayment experience is reviewed periodically, and effective yields are recalculated when differences arise between prepayments originally projected and the actual prepayments received and currently projected.  The effective yield is recalculated on a retrospective basis, and the adjustment is reflected in net investment income.

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

As of September 30, 2011, the amortized cost and fair value of our below-investment-grade fixed maturity securities was $2,757.5 million and $2,702.5 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.

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Mortgage Loans

Our mortgage loan portfolio was $1,606.9 million and $1,516.8 million on an amortized cost basis at September 30, 2011 and December 31, 2010, respectively. Our mortgage loan portfolio is comprised entirely of commercial mortgage loans. We believe our mortgage loan portfolio is well diversified geographically and among property types. The incidence of problem mortgage loans and foreclosure activity continues to be low. Due to conservative underwriting, we expect the level of problem loans to remain low relative to the industry.

We held three mortgage loans at September 30, 2011 and two mortgage loans at December 31, 2010 which were considered impaired. These mortgage loans were carried at the estimated net realizable values of $32.7 million and $22.9 million, respectively, net of a valuation allowance of $1.5 million at each period end. During the first nine months of 2011, we foreclosed on one impaired mortgage loan and transferred it into other long-term investments in our consolidated balance sheets. No realized loss was recognized on the foreclosure.

Derivative Financial Instruments

We use derivative financial instruments primarily to manage reinvestment risk, duration, and currency risk. Historically, we have utilized current and forward interest rate swaps and options on forward interest rate swaps, current and forward currency swaps, forward treasury locks, currency forward contracts, and forward contracts on specific fixed income securities. Our current credit exposure on derivatives, which is limited to the value of those contracts in a net gain position less collateral held, was $23.2 million at September 30, 2011. We held no cash collateral from our counterparties at September 30, 2011. The carrying value of fixed maturity securities posted as collateral to our counterparties was $131.6 million at September 30, 2011. We believe that our credit risk is mitigated by our use of multiple counterparties, all of which have a median credit rating of A or better, and by our use of cross-collateralization agreements.

Other

Our exposure to non-current investments, defined as foreclosed real estate and invested assets which are delinquent as to interest and/or principal payments, totaled $51.2 million and $56.2 million on a fair value basis at September 30, 2011 and December 31, 2010, 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, 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 our stockholder dividends or meet our debt and other payment obligations.

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

We have met all minimum pension funding requirements set forth by ERISA. A fourth quarter of 2010 contribution of $100.0 million was made in lieu of our planned 2011 contribution, and we do not anticipate making any additional contributions during 2011. 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 anticipate that we will make contributions during 2011 of approximately £3.1 million, £2.2 million of which was contributed during the first nine months of 2011.

In May 2010, our board of directors authorized the repurchase of up to $500.0 million of Unum Group's common stock, with the pace of repurchase activity to depend upon various factors such as the level of available cash, alternative uses for cash, and our stock price. During 2010, we repurchased 16.4 million shares, at a cost of $356.0 million, under this share repurchase program. The $500.0 million share repurchase program had an expiration date of May 2011. In February 2011, our board of directors authorized the repurchase of up to $1.0 billion of Unum Group's common stock, in addition to the amount remaining to be repurchased under the $500.0 million authorization. The $1.0 billion share repurchase program has an expiration date of August 2012.

During the first quarter of 2011, we repurchased 7.1 million shares, at a cost of $200.0 million, using an accelerated repurchase agreement with a financial counterparty. Under the terms of the repurchase agreement, we received a price adjustment based on the volume weighted-average price of our common stock during the term of the agreement. The price adjustment resulted in the delivery to us of approximately 0.6 million additional shares. In total, we repurchased 7.7 million shares of our common stock under this agreement. The shares repurchased pursuant to the accelerated repurchase agreement completed the $500.0 million repurchase authorization and initiated the $1.0 billion repurchase program. In addition to these repurchases, during the first three quarters of 2011 we repurchased an additional 17.7 million shares on the open market at a cost of $419.9 million, for a total repurchase of 25.4 million shares during the first nine months of 2011.

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 $647 million and $1.2 billion at September 30, 2011 and December 31, 2010, respectively. The decrease during the first nine months of 2011 reflects the purchase and retirement of $225.1 million of our 7.625% senior notes as well as the repurchase of shares of our common stock. The September 30, 2011 balance, of which $217.6 million was held in certain of our foreign subsidiaries in the U.K., was made up primarily of commercial paper, fixed maturity securities with a current average maturity of 2.4 years, and various money-market funds.  No significant restrictions exist on our ability to use or access these funds, with the exception of funds held in the U.K. We currently have no intent, nor do we foresee a need, to repatriate these funds. 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. Should we elect to repatriate funds from our subsidiaries in the U.K., the amounts repatriated would be subject to repatriation tax effects which generally equal the difference in the U.S. tax rate and the U.K. tax rate.

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During 2011, we intend to retain a level of capital in our traditional U.S. insurance subsidiaries such that we maintain a weighted average RBC level well above capital adequacy requirements. We also expect Unum Limited to operate above the Financial Services Authority (FSA) capital adequacy requirements and minimum solvency margins.

Consolidated Cash Flows

Operating Cash Flows

Net cash provided by operating activities was $788.7 million for the first nine months of 2011, compared to $913.8 million for the comparable period of 2010. Operating cash flows are primarily attributable to the receipt of premium and investment income, offset by payments of claims, commissions, expenses, and income taxes. Premium income growth is dependent not only on new sales, but on renewals of existing business, renewal price increases, and persistency. Investment income growth is dependent on the growth in the underlying assets supporting our insurance reserves and on the earned yield. The level of commissions and operating expenses is attributable to the level of sales and the first year acquisition expenses associated with new business as well as the maintenance of existing business. The level of paid claims is affected partially by the growth and aging of the block of business and also by the general economy, as previously discussed in the operating results by segment. Operating cash flows for the first nine months of 2010 include pension contributions of approximately $67.0 million.

Investing Cash Flows

Investing cash inflows consist primarily of the proceeds from the sales and maturities of investments.  Investing cash outflows consist primarily of payments for purchases of investments.  Net cash used by investing activities was $141.0 million for the first nine months of 2011 compared to $842.9 million for the comparable period of 2010.

Our sales of available-for-sale securities increased in the first nine months of 2011 compared to the same period of 2010.  Proceeds from maturities of available-for-sale securities were lower in the first nine months of 2011 compared to the same period of 2010 primarily due to a significant decrease in bond calls. 

Proceeds from sales and maturities of other investments decreased slightly in the first nine months of 2011 compared to the same period of 2010 primarily due to a decrease in maturities from mortgage loans offset by an increase in distributions received from private equity partnerships, and an increase in proceeds from terminations of derivative contracts within our cash flow hedging programs.  

Purchases of available-for-sale securities were lower in the first nine months of 2011 compared to the same period of 2010 as a result of the decline in funds available for reinvestment due to the decrease in bond calls, as discussed above.

Purchases of other investments increased in the first nine months of 2011 compared to the same period of 2010 as a result of an increase in funding of tax credit partnerships, offset by a slight decrease in funding of mortgage loans.

Net sales of short-term investments increased in the first nine months of 2011 compared to the same period of 2010 to provide funding for payment for our debt maturing in March 2011 and to also fund the 2011 repurchases of Unum Group common stock.  These sales were partially offset by purchases of short-term investments using cash received under 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 $649.0 million for the first nine months of 2011 compared to $63.9 million for the comparable period of 2010.

During the first nine months of 2011, we made short-term debt repayments of $225.1 million at the maturity date of our remaining 7.625% senior notes due March 2011. During the first nine months of 2010, we received proceeds of $400.0 million, less debt issuance costs of $3.0 million and a debt discount of $0.5 million, from the September 15, 2010 issuance of $400.0 million of 5.625% senior notes due 2020. During the first nine months of 2010, we purchased and retired $10.0 million of our 7.08% medium-term notes due 2024.

As of September 30, 2011, the amount outstanding under our securities lending program was $342.4 million. We had no securities lending transactions during 2010.

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During each of the first nine months of 2011 and 2010, Tailwind Holdings made principal payments of $7.5 million on its floating rate, senior secured non-recourse notes due 2036. During each of the first nine months of 2011 and 2010, Northwind Holdings made principal payments of $59.4 million and $45.2 million, respectively, on its floating rate, senior secured non-recourse notes due 2037.

During the first nine months of 2011 and 2010, we repurchased 25.4 million and 15.2 million shares of Unum Group's common stock at a cost of $619.9 million and $327.5 million, respectively. Approximately $3.5 million of the amount repurchased in the first nine months of 2010 was settled subsequent to the end of the third quarter of 2010.

See “Debt” contained in this Item 2 for further information.

Cash Available from Subsidiaries

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

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

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

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

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

The ability of Unum Group and certain of its intermediate holding company subsidiaries to continue to receive dividends from their insurance subsidiaries generally depends on the level of earnings of those insurance subsidiaries and additional factors such as RBC ratios and FSA capital adequacy requirements, funding growth objectives at an affiliate level, and maintaining appropriate capital adequacy ratios to support desired ratings. Insurance regulatory restrictions do not limit the amount of dividends available for distribution from non-insurance subsidiaries except where the non-insurance subsidiaries are held directly or indirectly by an insurance subsidiary and only indirectly by Unum Group. We intend to retain a level of capital in our traditional U.S. insurance subsidiaries such that we maintain a weighted average RBC level above capital adequacy requirements. We also expect Unum Limited to operate above FSA capital adequacy requirements and minimum solvency margins.

Debt

At September 30, 2011, we had short-term debt of $342.4 million, consisting entirely of securities lending agreements. At September 30, 2011, we had long-term debt, including senior secured notes and junior subordinated debt securities, totaling $2,586.5 million. Our leverage ratio, when calculated using consolidated debt to total consolidated capital, was 26.4 percent at September 30, 2011, compared to 25.9 percent at December 31, 2010. Our leverage ratio, when calculated excluding the non-recourse debt and associated capital of Tailwind Holdings and Northwind Holdings and the short-term debt arising from securities lending agreements, was 21.2 percent at September 30, 2011 compared to 22.8 percent at December 31, 2010. The increase in our consolidated debt to total consolidated capital leverage ratio is due primarily to the $342.4 million of securities lending agreements outstanding at September 30, 2011, partially offset by the maturity of $225.1 million of senior notes and our principal payments on the debt of Northwind Holdings and Tailwind Holdings during the first nine months of 2011.

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Leverage is measured as total debt to total capital, which we define as total long-term and short-term debt plus stockholders' equity, excluding the net unrealized gain or loss on securities and the net gain or loss on cash flow hedges. We believe that a leverage ratio which excludes the net unrealized gains and losses on securities and the net gain or loss on cash flow hedges, both of which tend to fluctuate depending on market conditions and general economic trends, and which also excludes the non-recourse debt and associated capital of Tailwind Holdings and Northwind Holdings and the short-term debt arising from securities lending is a better indicator of our ability to meet our financial obligations.

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

See “Debt” in Part II, Item 7 of our annual report on Form 10-K for the year ended December 31, 2010, for further discussion.

Commitments

At September 30, 2011, we had legally binding unfunded commitments of $158.6 million and $15.7 million, which are recognized as liabilities in our consolidated balance sheets, to fund tax credit partnership investments and transferrable 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 $28.7 million to fund certain investments in private placement fixed maturity securities, $57.3 million to fund certain private equity partnerships, $0.5 million to fund underlying partnerships in our investment in a special purpose entity, and $17.8 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, 2010. During the first nine months of 2011, 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 above.

Transfers of Financial Assets

To manage our cash position more efficiently, we 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 transactions, which increase our investment income with minimal risk. We account for all of our securities lending transactions and repurchase agreements as collateralized financings. We had $342.4 million of securities lending transactions outstanding which were collateralized by cash at September 30, 2011 and were reported as short-term debt in our consolidated balance sheets. The cash received as collateral was reinvested in short-term investments. The average balance during the first nine months of 2011 was $117.2 million, and the maximum amount outstanding at any month end was $342.4 million. In addition, at September 30, 2011, we also had $15.4 million of off-balance sheet securities lending transactions which were collateralized by securities that we were neither permitted to sell nor control. The average balance of these off-balance sheet transactions during the first nine months of 2011 was $2.0 million, and the maximum amount outstanding at any month end was $15.4 million.

We had no repurchase agreements outstanding at September 30, 2011, nor did we utilize any repurchase agreements during the first nine months of 2011. 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.

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Ratings

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

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

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

	AM Best	Fitch	Moody's	S&P
Issuer Credit Ratings	bbb (Good)	BBB (Good)	Baa3 (Moderate)	BBB- (Good)
Financial Strength Ratings
Provident Life and Accident	A (Excellent)	A (Strong)	A3 (Good)	A- (Strong)
Provident Life and Casualty	A (Excellent)	A (Strong)	Not Rated	Not Rated
Unum Life of America	A (Excellent)	A (Strong)	A3 (Good)	A- (Strong)
First Unum Life	A (Excellent)	A (Strong)	A3 (Good)	A- (Strong)
Colonial Life & Accident	A (Excellent)	A (Strong)	A3 (Good)	A- (Strong)
Paul Revere Life	A (Excellent)	A (Strong)	A3 (Good)	A- (Strong)
Paul Revere Variable	B++(Good)	A (Strong)	A3 (Good)	Not Rated
Unum Limited	Not Rated	Not Rated	Not Rated	A- (Strong)

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

On January 26, 2011, AM Best upgraded its ratings of Unum Group and its operating subsidiaries to bbb and A, respectively, with the exception of Paul Revere Variable which retained its B++ rating, and revised the outlook for the Company and its subsidiaries to “stable.” On June 23, 2011, Fitch affirmed its A rating of Unum Group and its domestic subsidiaries and affirmed the senior debt rating at BBB. Fitch's rating outlook for Unum Group is Stable. On August 4, 2011, Moody's affirmed the Baa3 credit rating of Unum Group and the A3 financial strength rating of its domestic subsidiaries and revised the outlook for the Company and its subsidiaries to “positive.” On August 15, 2011, S&P affirmed the BBB- credit rating of Unum Group and the A- financial strength rating of its domestic subsidiaries and raised the outlook for the Company and its subsidiaries to “positive.”

There have been no other changes in any of the rating agencies’ outlook statements or ratings during the first nine months of 2011 or prior to the date of this filing.

Agency ratings are not directed toward the holders of our securities and are not recommendations to buy, sell, or hold our securities. Each rating is subject to revision or withdrawal at any time by the assigning rating organization, and each rating should be regarded as an independent assessment, not conditional on any other rating. Given the dynamic nature of the ratings process, changes by these or other rating agencies may or may not occur in the near-term. Based on our ongoing dialogue with the rating agencies concerning our improved insurance risk profile, our financial flexibility, our operating performance, and the quality of our investment portfolio, we do not expect any negative actions from any of the four rating agencies related to either Unum Group's current issuer credit ratings or the financial strength ratings of its insurance subsidiaries. However, in the event

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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, 2010 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, 2010. During the first nine months of 2011, there was no substantive change to our market risk or the management of this risk.

ITEM 4. CONTROLS AND PROCEDURES

Under the supervision and with the participation of our management, including our Chief Executive Officer and Chief Financial Officer, we have evaluated the effectiveness of our disclosure controls and procedures, as defined in Rule 13a-15(e) under the Securities Exchange Act of 1934, as amended, as of the end of the period covered by this quarterly report. Based on that evaluation, these officers concluded that our disclosure controls and procedures were effective as of September 30, 2011.

There have been no changes in our internal control over financial reporting, as defined in Rule 13a-15(f) under the Securities Exchange Act of 1934, as amended, during the quarter ended September 30, 2011 that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

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PART II

ITEM 1. LEGAL PROCEEDINGS

Refer to Part I, Item 1, Note 9 of the “Notes to Consolidated Financial Statements” for information on legal proceedings.

ITEM 1A. RISK FACTORS

There have been no material changes from the risk factors disclosed in our annual report on Form 10-K for the year ended December 31, 2010.

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

The following table provides information about our share repurchase activity for the third quarter of 2011:

	(a) Total Number of Shares Purchased	(b) Average Price Paid per Share (1)		(c) Total Number of Shares Purchased as Part of Publicly Announced Program (2)	(d) Approximate Dollar Value of Shares that May Yet Be Purchased Under the Program (2)
July 1 - July 31, 2011	—	$	—	—	$	774,765,514
August 1 - August 31, 2011	11,137,253	22.45		11,137,253	524,749,018
September 1 - September 30, 2011	—	—		—	524,749,018
Total	11,137,253			11,137,253

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

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

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ITEM 6. EXHIBITS

Index to Exhibits

Exhibit 15	Letter Re: Unaudited Interim Financial Information.
Exhibit 31.1	Certification of Chief Executive Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
Exhibit 31.2	Certification of Chief Financial Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
Exhibit 32.1	Certification of Chief Executive Officer pursuant to 18 U.S.C. Section 1350 as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
Exhibit 32.2	Certification of Chief Financial Officer pursuant to 18 U.S.C. Section 1350 as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
Exhibit 101	The following financial statements from Unum Group’s Quarterly Report on Form 10-Q for the quarter ended September 30, 2011, filed on November 2, 2011, formatted in XBRL: (i) Consolidated Balance Sheets, (ii) Consolidated Statements of Income, (iii) Consolidated Statements of Stockholders’ Equity, (iv) Consolidated Statements of Cash Flows, (v) Consolidated Statements of Comprehensive Income, (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:	November 2, 2011	/s/ Thomas R. Watjen
		Thomas R. Watjen
		President and Chief Executive Officer
Date:	November 2, 2011	/s/ Richard P. McKenney
		Richard P. McKenney
		Executive Vice President and Chief Financial Officer

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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. 33-47551, Form S-8 No. 33-88108) of Unum Group (formerly Provident Companies, Inc.) pertaining to the Provident Life and Accident Insurance Company MoneyMaker, A Long-Term 401(k) Retirement Savings Plan,

2. Registration Statement (Form S-8 No. 333-40219) pertaining to:

a. The Paul Revere Savings Plan

b. Provident Life and Accident Insurance Company Stock Plan of 1994

c. Provident Life and Accident Insurance Company Annual Management Incentive Compensation Plan of 1994,

3. Registration Statement (Form S-8 No. 033-62231) pertaining to the Provident Life and Accident Insurance Company Employee Stock Purchase Plan of 1995,

4. 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,

5. Registration Statement (Form S-8 No. 333-81969) pertaining to:

a. UnumProvident Corporation 1987 Executive Stock Option Plan

b. UnumProvident Corporation 1990 Long-Term Stock Incentive Plan

c. UnumProvident Corporation 1996 Long-Term Stock Incentive Plan

d. UnumProvident Corporation 1998 Goals Stock Option Plan,

6. 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,

7. Shelf Registration Statement (Form S-3 No. 333-100953) and the related Registration Statement (No. 333-104926) filed under Rule 462(b),

8. Shelf Registration Statement (Form S-3 No. 333-115485),

9. Registration Statement (Form S-3 No. 333-121758),

10. 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,

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

12. Registration Statement (Form S-3 ASR No. 333-155283), and

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

of our report dated November 2, 2011 relating to the unaudited consolidated interim financial statements of Unum Group and subsidiaries that are included in this Form 10-Q for the quarter ended September 30, 2011.

/s/ ERNST & YOUNG LLP

Chattanooga, Tennessee

November 2, 2011

EX-31.1

EXHIBIT 31.1

CERTIFICATION

I, Thomas R. Watjen, certify that:

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

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

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

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

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

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

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

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

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

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

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

Date: November 2, 2011	/s/ Thomas R. Watjen
	Thomas R. Watjen
	President and Chief Executive Officer

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

EX-31.2

EXHIBIT 31.2

CERTIFICATION

I, Richard P. McKenney, certify that:

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

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

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

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

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

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

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

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

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

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

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

Date: November 2, 2011	/s/ Richard P. McKenney
	Richard P. McKenney
	Executive Vice President and Chief Financial Officer

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

EX-32.1

EXHIBIT 32.1

STATEMENT OF CHIEF EXECUTIVE OFFICER

OF UNUM GROUP

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

AS ADOPTED PURSUANT TO

§ 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report of Unum Group (the Company) on Form 10-Q for the period ended September 30, 2011 as filed with the Securities and Exchange Commission on the date hereof (the Report), the undersigned, Thomas R. Watjen, President and Chief Executive Officer of the Company, certifies, pursuant to 18 U.S.C. § 1350, as adopted pursuant to § 906 of the Sarbanes-Oxley Act of 2002, that:

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

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

Date: November 2, 2011	/s/ Thomas R. Watjen
	Thomas R. Watjen
	President and Chief Executive Officer

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

EX-32.2

EXHIBIT 32.2

STATEMENT OF CHIEF FINANCIAL OFFICER

OF UNUM GROUP

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

AS ADOPTED PURSUANT TO

§ 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report of Unum Group (the Company) on Form 10-Q for the period ended September 30, 2011 as filed with the Securities and Exchange Commission on the date hereof (the Report), the undersigned, Richard P. McKenney, Executive Vice President and Chief Financial Officer of the Company, certifies, pursuant to 18 U.S.C. § 1350, as adopted pursuant to § 906 of the Sarbanes-Oxley Act of 2002, that:

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

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

Date: November 2, 2011	/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.

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Premium Income by Major Line of Business within Each Segment (Detail) (USD $) In Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Segment Reporting Information [Line Items]
Premiums Earned, Net	$ 1,881.2	$ 1,850.2	$ 5,625.7	$ 5,563.2
Unum U.S.
Segment Reporting Information [Line Items]
Premiums Earned, Net	1,226.5	1,210.6	3,666.5	3,643.2
Unum U.S. | Group Long term Disability
Segment Reporting Information [Line Items]
Premiums Earned, Net	393.7	404.9	1,185.3	1,233.6
Unum U.S. | Group Short-term Disability
Segment Reporting Information [Line Items]
Premiums Earned, Net	115.2	108.7	339.0	322.5
Unum U.S. | Group Life
Segment Reporting Information [Line Items]
Premiums Earned, Net	277.6	273.0	825.3	814.5
Unum U.S. | Accidental Death & Dismemberment
Segment Reporting Information [Line Items]
Premiums Earned, Net	27.7	27.0	81.6	79.3
Unum U.S. | Individual Disability-Recently Issued
Segment Reporting Information [Line Items]
Premiums Earned, Net	116.6	116.7	348.3	349.5
Unum U.S. | Long-term Care
Segment Reporting Information [Line Items]
Premiums Earned, Net	152.1	149.4	453.5	448.1
Unum U.S. | Voluntary Benefits
Segment Reporting Information [Line Items]
Premiums Earned, Net	143.6	130.9	433.5	395.7
Unum U.K.
Segment Reporting Information [Line Items]
Premiums Earned, Net	175.5	161.4	518.4	480.1
Unum U.K. | Group Long term Disability UK [Member]
Segment Reporting Information [Line Items]
Premiums Earned, Net	107.3	101.8	318.3	310.7
Unum U.K. | Group Life UK [Member]
Segment Reporting Information [Line Items]
Premiums Earned, Net	52.1	44.5	151.6	126.8
Unum U.K. | Supplemental and Voluntary UK [Member]
Segment Reporting Information [Line Items]
Premiums Earned, Net	16.1	15.1	48.5	42.6
Colonial Life
Segment Reporting Information [Line Items]
Premiums Earned, Net	283.7	269.3	846.1	802.1
Colonial Life | Accident, Sickness, and Disability - Colonial
Segment Reporting Information [Line Items]
Premiums Earned, Net	174.3	166.1	519.7	493.1
Colonial Life | Life Colonial
Segment Reporting Information [Line Items]
Premiums Earned, Net	47.0	43.4	140.0	131.0
Colonial Life | Cancer and Critical Illness - Colonial
Segment Reporting Information [Line Items]
Premiums Earned, Net	62.4	59.8	186.4	178.0
Individual Disability-Closed Block
Segment Reporting Information [Line Items]
Premiums Earned, Net	196.4	208.5	595.0	635.0
Corporate and Other
Segment Reporting Information [Line Items]
Premiums Earned, Net	$ (0.9)	$ 0.4	$ (0.3)	$ 2.8

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CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Millions, except Share data	Sep. 30, 2011	Dec. 31, 2010
Investments [Abstract]
Fixed Maturity Securities, amortized cost	$ 36,746.7	$ 36,546.6
Stockholders' Equity
Common Stock, par	$ 0.10	$ 0.10
Common Stock, Authorized	725,000,000	725,000,000
Common Stock, Issued	358,312,558	364,842,919
Treasury Stock, shares	65,975,613	48,269,467

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CONSOLIDATED STATEMENTS OF INCOME (USD $) In Millions, except Per Share data	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Revenue
Premium Income	$ 1,881.2	$ 1,850.2	$ 5,625.7	$ 5,563.2
Net Investment Income	629.2	618.4	1,885.0	1,861.2
Realized Investment Gain (Loss)
Total Other-Than-Temporary Impairment Loss on Fixed Maturity Securities	(1.2)	0	(4.2)	(10.4)
Other Net Realized Investment Gain (Loss)	(22.7)	1.1	(8.1)	7.6
Net Realized Investment Gain (Loss)	(23.9)	1.1	(12.3)	(2.8)
Other Income	59.1	58.2	174.8	178.5
Total Revenue	2,545.6	2,527.9	7,673.2	7,600.1
Benefits and Expenses
Benefits and Change in Reserves for Future Benefits	1,635.6	1,587.5	4,828.0	4,736.0
Commissions	220.5	214.0	662.7	640.1
Interest and Debt Expense	35.1	35.2	108.1	102.7
Deferral of Acquisition Costs	(155.6)	(150.9)	(472.1)	(455.5)
Amortization of Deferred Acquisition Costs	125.2	130.6	400.4	407.7
Compensation Expense	198.3	194.1	598.9	582.8
Other Expenses	193.2	190.9	585.7	590.5
Total Benefits and Expenses	2,252.3	2,201.4	6,711.7	6,604.3
Income Before Income Tax	293.3	326.5	961.5	995.8
Income Tax
Current	54.4	80.6	210.7	250.7
Deferred	33.3	25.1	90.0	84.8
Total Income Tax	87.7	105.7	300.7	335.5
Net Income	$ 205.6	$ 220.8	$ 660.8	$ 660.3
Net Income Per Common Share
Basic	$ 0.69	$ 0.68	$ 2.16	$ 2.01
Assuming Dilution	$ 0.69	$ 0.68	$ 2.15	$ 2.00

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Assets by Segment (Detail) (USD $) In Millions	Sep. 30, 2011	Dec. 31, 2010
Segment Reporting Information [Line Items]
Assets	$ 60,040.9	$ 57,307.7
Unum U.S.
Segment Reporting Information [Line Items]
Assets	26,701.7	24,876.9
Unum U.K.
Segment Reporting Information [Line Items]
Assets	3,568.3	3,386.3
Colonial Life
Segment Reporting Information [Line Items]
Assets	3,294.7	3,047.3
Individual Disability-Closed Block
Segment Reporting Information [Line Items]
Assets	16,109.4	15,509.1
Corporate and Other
Segment Reporting Information [Line Items]
Assets	$ 10,366.8	$ 10,488.1

XML

Segment Information (Tables)

9 Months Ended

Sep. 30, 2011

Notes to Financial Statements [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. Certain prior year amounts within Unum UK have been reclassified to conform to current year presentation.

	Three Months Ended September 30					Nine Months Ended September 30
	2011			2010		2011			2010
	(in millions of dollars)
Unum US
Group Disability
Group Long-term Disability	$	393.7		$	404.9	$	1,185.3		$	1,233.6
Group Short-term Disability	115.2			108.7		339.0			322.5
Group Life and Accidental Death & Dismemberment
Group Life	277.6			273.0		825.3			814.5
Accidental Death & Dismemberment	27.7			27.0		81.6			79.3
Supplemental and Voluntary
Individual Disability - Recently Issued	116.6			116.7		348.3			349.5
Long-term Care	152.1			149.4		453.5			448.1
Voluntary Benefits	143.6			130.9		433.5			395.7
	1,226.5			1,210.6		3,666.5			3,643.2
Unum UK
Group Long-term Disability	107.3			101.8		318.3			310.7
Group Life	52.1			44.5		151.6			126.8
Supplemental and Voluntary	16.1			15.1		48.5			42.6
	175.5			161.4		518.4			480.1
Colonial Life
Accident, Sickness, and Disability	174.3			166.1		519.7			493.1
Life	47.0			43.4		140.0			131.0
Cancer and Critical Illness	62.4			59.8		186.4			178.0
	283.7			269.3		846.1			802.1
Individual Disability - Closed Block	196.4			208.5		595.0			635.0
Corporate and Other	(0.9		)	0.4		(0.3		)	2.8
Total	$	1,881.2		$	1,850.2	$	5,625.7		$	5,563.2

Selected Operating Statement Data by Segment

Selected operating statement data by segment is presented as follows:

	Unum US		Unum UK		Colonial Life		Individual Disability - Closed Block		Corporate and Other			Total
	(in millions of dollars)
Three Months Ended September 30, 2011
Premium Income	$	1,226.5	$	175.5	$	283.7	$	196.4	$	(0.9	)	$	1,881.2
Net Investment Income	332.4		43.3		32.5		181.9		39.1			629.2
Other Income	30.4		—		0.1		23.6		5.0			59.1
Operating Revenue	$	1,589.3	$	218.8	$	316.3	$	401.9	$	43.2		$	2,569.5
Operating Income (Loss)	$	219.5	$	34.9	$	70.3	$	14.0	$	(21.5	)	$	317.2
Three Months Ended September 30, 2010
Premium Income	$	1,210.6	$	161.4	$	269.3	$	208.5	$	0.4		$	1,850.2
Net Investment Income	312.9		39.0		31.9		185.5		49.1			618.4
Other Income	29.7		0.2		0.2		22.7		5.4			58.2
Operating Revenue	$	1,553.2	$	200.6	$	301.4	$	416.7	$	54.9		$	2,526.8
Operating Income (Loss)	$	204.7	$	47.2	$	74.5	$	9.8	$	(10.8	)	$	325.4
Nine Months Ended September 30, 2011
Premium Income	$	3,666.5	$	518.4	$	846.1	$	595.0	$	(0.3	)	$	5,625.7
Net Investment Income	983.1		139.3		99.6		544.2		118.8			1,885.0
Other Income	91.1		0.1		0.4		67.9		15.3			174.8
Operating Revenue	$	4,740.7	$	657.8	$	946.1	$	1,207.1	$	133.8		$	7,685.5
Operating Income (Loss)	$	646.7	$	138.3	$	214.5	$	34.3	$	(60.0	)	$	973.8
Nine Months Ended September 30, 2010
Premium Income	$	3,643.2	$	480.1	$	802.1	$	635.0	$	2.8		$	5,563.2
Net Investment Income	936.2		121.9		91.1		563.5		148.5			1,861.2
Other Income	90.6		1.1		0.5		67.3		19.0			178.5
Operating Revenue	$	4,670.0	$	603.1	$	893.7	$	1,265.8	$	170.3		$	7,602.9
Operating Income (Loss)	$	619.9	$	160.7	$	221.4	$	33.9	$	(37.3	)	$	998.6

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

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

	Three Months Ended September 30					Nine Months Ended September 30
	2011			2010		2011			2010
	(in millions of dollars)
Operating Revenue by Segment	$	2,569.5		$	2,526.8	$	7,685.5		$	7,602.9
Net Realized Investment Gain (Loss)	(23.9		)	1.1		(12.3		)	(2.8		)
Revenue	$	2,545.6		$	2,527.9	$	7,673.2		$	7,600.1
Operating Income by Segment	$	317.2		$	325.4	$	973.8		$	998.6
Net Realized Investment Gain (Loss)	(23.9		)	1.1		(12.3		)	(2.8		)
Income Tax	87.7			105.7		300.7			335.5
Net Income	$	205.6		$	220.8	$	660.8		$	660.3

Assets by Segment

Assets by segment are as follows:

	September 30 2011		December 31 2010
	(in millions of dollars)
Unum US	$	26,701.7	$	24,876.9
Unum UK	3,568.3		3,386.3
Colonial Life	3,294.7		3,047.3
Individual Disability - Closed Block	16,109.4		15,509.1
Corporate and Other	10,366.8		10,488.1
Total	$	60,040.9	$	57,307.7

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Document and Entity Information	9 Months Ended
	Sep. 30, 2011	Oct. 31, 2011
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2011
Document Fiscal Year Focus	2011
Document Fiscal Period Focus	Q3
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		292,380,426

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Location of and Gain (Loss) on Embedded Derivative in a Modified Coinsurance Arrangement (Detail) (USD $) In Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in Net Realized Investment Gain	$ (33.7)	$ 1.6	$ (24.4)	$ (3.7)

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Accounting Developments (Details) (USD $) In Millions	9 Months Ended
	Sep. 30, 2011
Minimum [Member]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification	$ 400.0
Maximum [Member]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification	$ 600.0

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Location of Gains and Losses on Derivative Financial Instruments Designated as Cash Flow Hedging Instruments (Detail) (USD $) In Millions	3 Months Ended				9 Months Ended
	Sep. 30, 2011		Sep. 30, 2010		Sep. 30, 2011		Sep. 30, 2010
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in OCI on Derivatives (Effective Portion)	$ 59.4		$ (42.2)		$ 76.3		$ 12.9
Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	55.2		(12.5)		48.4		19.2
Gain (Loss) Recognized in Income on Derivatives (Ineffective Portion)	0		0		0		0
Interest Rate Swaps | Net Investment Income
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in OCI on Derivatives (Effective Portion)	8.0		(7.7)		35.4		16.8
Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	8.6	[1]	6.9	[1]	26.0	[1]	22.5	[1]
Gain (Loss) Recognized in Income on Derivatives (Ineffective Portion)	0		0		0		0
Interest Rate Swaps | Net Realized Investments Gain (Loss)
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in OCI on Derivatives (Effective Portion)	0		0		0		0
Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	0.7	[2]	1.6	[2]	2.5	[2]	4.2	[2]
Gain (Loss) Recognized in Income on Derivatives (Ineffective Portion)	0		0		0		0
Interest Rate Swaps | Other Income [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)	[3]
Gain (Loss) Recognized in Income on Derivatives (Ineffective Portion)							0
Interest Rate Swaps | Interest and Debt Expenses
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in OCI on Derivatives (Effective Portion)	0		0		0		0
Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	(0.4)	[4]	(0.1)	[3]	(1.2)	[4]	(0.1)	[4]
Gain (Loss) Recognized in Income on Derivatives (Ineffective Portion)	0		0		0		0
Foreign Exchange Contracts | Net Investment Income
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in OCI on Derivatives (Effective Portion)	0		0		0		0
Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	(0.3)	[1]	(0.4)	[1]	(0.9)	[1]	(1.5)	[1]
Gain (Loss) Recognized in Income on Derivatives (Ineffective Portion)	0		0		0		0
Foreign Exchange Contracts | Net Realized Investments Gain (Loss)
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in OCI on Derivatives (Effective Portion)	51.4		(34.5)		40.9		(3.9)
Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	46.6	[2]	(21.2)	[2]	22.0	[2]	(7.7)	[2]
Gain (Loss) Recognized in Income on Derivatives (Ineffective Portion)	0		0		0		0
Foreign Exchange Contracts | Interest and Debt Expenses
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in OCI on Derivatives (Effective Portion)			0				0
Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)			0.7	[4]			1.9	[4]
Gain (Loss) Recognized in Income on Derivatives (Ineffective Portion)			$ 0				$ 0

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

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

[3] (4)Loss recognized in other income

[4] (3)Loss recognized in interest and debt expense Three Months Ended September 30, 2010 Loss Recognized in OCIon Derivatives(Effective Portion) Gain (Loss) Reclassified fromAccumulated OCI into Income(Effective Portion) Gain (Loss) Recognizedin Income on Derivatives(Ineffective Portion) (in millions of dollars)Interest Rate Swaps and Forwards$(7.7) $6.9(1) $—Interest Rate Swaps— 1.6(2) —Interest Rate Swaps— (0.1)(3) —Foreign Exchange Contracts— (0.4)(1) —Foreign Exchange Contracts(34.5) (21.2)(2) —Foreign Exchange Contracts— 0.7(3) —Total$(42.2) $(12.5) $—

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Fair Values of Financial Instruments

9 Months Ended

Sep. 30, 2011

Notes to Financial Statements [Abstract]

Fair Values of Financial Instruments

Fair Values of Financial Instruments

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

	September 30, 2011				December 31, 2010
	Carrying Amount		Fair Value		Carrying Amount		Fair Value
	(in millions of dollars)
Assets
Fixed Maturity Securities	$	42,434.7	$	42,434.7	$	40,035.6	$	40,035.6
Mortgage Loans	1,606.9		1,789.9		1,516.8		1,685.4
Policy Loans	3,075.1		3,146.0		2,996.1		3,044.4
Other Long-term Investments
Derivatives	143.2		143.2		99.1		99.1
Equity Securities	10.4		10.4		10.4		10.4
Miscellaneous Long-term Investments	457.5		457.5		419.8		419.8
Liabilities
Policyholders’ Funds
Deferred Annuity Products	$	642.5	$	642.5	$	656.3	$	656.3
Supplementary Contracts without Life Contingencies	491.8		491.8		508.5		508.5
Short-term Debt	342.4		342.4		225.1		226.8
Long-term Debt	2,586.5		2,589.9		2,631.3		2,483.8
Other Liabilities
Derivatives	154.7		154.7		199.6		199.6
Embedded Derivative in Modified Coinsurance Arrangement	120.7		120.7		96.3		96.3
Unfunded Commitments to Investment Partnerships	158.6		158.6		169.9		169.9

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.

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. The carrying amounts of ceded policy loans of $2,864.0 million and $2,790.5 million as of September 30, 2011 and December 31, 2010, respectively, are reported on a gross basis in our consolidated balance sheets and approximate fair value.

Miscellaneous Long-term Investments: Carrying amounts approximate fair value.

Policyholders’ Funds: Policyholders' funds are comprised primarily of deferred annuity products and supplementary contracts without life contingencies. The carrying amounts approximate fair value.

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 minimizes exposure to changing interest rates through the matching of investment maturities with amounts due under insurance contracts.

Short-term and Long-term Debt: Fair values for short-term and long-term debt other than securities lending transactions are obtained from independent pricing services or discounted cash flow analyses based on current incremental borrowing rates for similar types of borrowing arrangements. Carrying amounts for outstanding securities lending transactions approximate fair value.

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.

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 markets are less active, brokers may rely more on models with inputs based on the information available only to the broker. 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 2011, we have applied valuation techniques on a consistent basis to similar assets and liabilities and consistent with those techniques used at year end 2010.

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

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.  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.

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 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. In regard to our own credit risk component, we adjust the valuation of derivative liabilities wherein the counterparty is exposed to our credit risk when the LIBOR-based valuation of our derivatives obtained from pricing sources does not effectively include an adequate credit component for our own credit risk.

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

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

At September 30, 2011, approximately 15.7 percent of our fixed maturity securities were valued using active trades from TRACE pricing or broker market maker prices for which there was current market activity in that specific security (comparable to receiving one binding quote).  The prices obtained were not adjusted, and the assets were classified as Level 1, the highest category of the three-level fair value hierarchy classification wherein inputs are unadjusted and represent quoted prices in active markets for identical assets or liabilities.

The remaining 84.3 percent of our fixed maturity securities were valued based on non-binding quotes or other observable or unobservable inputs, as discussed below.

• Approximately 68.7 percent of our fixed maturity securities were valued based on prices from pricing services that generally use observable inputs such as prices for securities or comparable securities in active markets in their valuation techniques. These assets were classified as Level 2. Level 2 assets or liabilities are those valued using inputs (other than prices included in Level 1) that are either directly or indirectly observable for the asset or liability through correlation with market data at the measurement date and for the duration of the instrument’s anticipated life.

• Approximately 4.4 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 11.2 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.

The categorization of fair value measurements by input level is as follows:

	September 30, 2011
	(in millions of dollars)
	Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
Assets
Fixed Maturity Securities
United States Government and Government Agencies and Authorities	$	324.7	$	968.9	$	—	$	1,293.6
States, Municipalities, and Political Subdivisions	31.5		1,554.9		—		1,586.4
Foreign Governments	—		1,474.7		—		1,474.7
Public Utilities	1,131.4		8,973.5		395.8		10,500.7
Mortgage/Asset-Backed Securities	—		3,127.4		19.6		3,147.0
All Other Corporate Bonds	5,183.6		18,725.4		466.8		24,375.8
Redeemable Preferred Stocks	—		34.8		21.7		56.5
Total Fixed Maturity Securities	6,671.2		34,859.6		903.9		42,434.7
Other Long-term Investments
Derivatives
Interest Rate Swaps and Forwards	—		140.8		—		140.8
Foreign Exchange Contracts	—		2.4		—		2.4
Total Derivatives	—		143.2		—		143.2
Equity Securities	—		—		10.4		10.4
Liabilities
Other Liabilities
Derivatives
Interest Rate Swaps	$	—	$	33.5	$	—	$	33.5
Foreign Exchange Contracts	—		121.2		—		121.2
Embedded Derivative in Modified Coinsurance Arrangement	—		—		120.7		120.7
Total Derivatives	—		154.7		120.7		275.4

	December 31, 2010
	(in millions of dollars)
	Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
Assets
Fixed Maturity Securities
United States Government and Government Agencies and Authorities	$	102.8	$	998.9	$	—	$	1,101.7
States, Municipalities, and Political Subdivisions	301.9		943.3		—		1,245.2
Foreign Governments	0.7		1,408.6		—		1,409.3
Public Utilities	840.1		8,670.5		173.6		9,684.2
Mortgage/Asset-Backed Securities	—		3,384.8		0.7		3,385.5
All Other Corporate Bonds	4,170.7		18,154.3		829.7		23,154.7
Redeemable Preferred Stocks	—		33.3		21.7		55.0
Total Fixed Maturity Securities	5,416.2		33,593.7		1,025.7		40,035.6
Other Long-term Investments
Derivatives
Interest Rate Swaps	—		98.4		—		98.4
Foreign Exchange Contracts	—		0.7		—		0.7
Total Derivatives	—		99.1		—		99.1
Equity Securities	—		8.9		1.5		10.4
Liabilities
Other Liabilities
Derivatives
Interest Rate Swaps	$	—	$	39.1	$	—	$	39.1
Foreign Exchange Contracts	—		160.5		—		160.5
Embedded Derivative in Modified Coinsurance Arrangement	—		—		96.3		96.3
Total Derivatives	—		199.6		96.3		295.9

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

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

	Three Months Ended September 30, 2010				Nine Months Ended September 30, 2010
	(in millions of dollars) Transfers into
	Level 1 from Level 2		Level 2 from Level 1		Level 1 from Level 2		Level 2 from Level 1
Fixed Maturity Securities
United States Government and Government Agencies and Authorities	$	17.1	$	20.5	$	110.8	$	—
States, Municipalities, and Political Subdivisions	123.7		40.0		55.4		59.5
Public Utilities	678.9		579.4		616.1		581.0
All Other Corporate Bonds	2,328.7		1,887.6		2,949.3		1,052.4
Redeemable Preferred Stock	—		—		—		5.5
Total Fixed Maturity Securities	$	3,148.4	$	2,527.5	$	3,731.6	$	1,698.4

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 September 30, 2011
	(in millions of dollars)
				Total Realized and Unrealized Investment Gains (Losses) Included in
	Beginning of Period			Earnings			Other Comprehensive Income or Loss			Purchases		Sales			Level 3 Transfers					End of Period
															Into		Out of
Fixed Maturity Securities
Public Utilities	$	217.9		$	0.1		$	9.3		$	30.0	$	(11.9	)	$	220.2	$	(69.8	)	$	395.8
Mortgage/Asset-Backed Securities	19.7			—			(0.1		)	—		—			—		—			19.6
All Other Corporate Bonds	528.3			—			1.3			—		(17.6		)	119.6		(164.8		)	466.8
Redeemable Preferred Stocks	22.6			—			(0.9		)	—		—			—		—			21.7
Total Fixed Maturity Securities	788.5			0.1			9.6			30.0		(29.5		)	339.8		(234.6		)	903.9
Equity Securities	3.6			(0.4		)	(2.4		)	—		—			9.6		—			10.4
Embedded Derivative in Modified Coinsurance Arrangement	(87.0		)	(33.7		)	—			—		—			—		—			(120.7		)
	Three Months Ended September 30, 2010
	(in millions of dollars)
				Total Realized and Unrealized Investment Gains Included in
	Beginning of Period			Earnings			Other Comprehensive Income or Loss			Purchases		Sales			Level 3 Transfers					End of Period
															Into		Out of
Fixed Maturity Securities
States, Municipalities, and Political Subdivisions	$	—		$	—		$	0.5		$	17.7	$	—		$	—	$	—		$	18.2
Public Utilities	72.4			—			6.8			—		(1.3		)	108.0		(28.0		)	157.9
Mortgage/Asset-Backed Securities	1.5			—			—			—		(0.8		)	—		—			0.7
All Other Corporate Bonds	430.1			—			11.1			3.1		(5.3		)	127.7		(44.1		)	522.6
Redeemable Preferred Stocks	21.3			—			—			—		—			—		(21.2		)	0.1
Total Fixed Maturity Securities	525.3			—			18.4			20.8		(7.4		)	235.7		(93.3		)	699.5
Equity Securities	8.9			—			1.8			—		—			—		—			10.7
Embedded Derivative in Modified Coinsurance Arrangement	(122.7		)	1.6			—			—		—			—		—			(121.1		)

	Nine Months Ended September 30, 2011
	(in millions of dollars)
				Total Realized and Unrealized Investment Gains (Losses) Included in
	Beginning of Year			Earnings			Other Comprehensive Income or Loss			Purchases		Sales			Level 3 Transfers					End of Period
															Into		Out of
Fixed Maturity Securities
Public Utilities	$	173.6		$	0.1		$	17.1		$	30.0	$	(15.7	)	$	299.7	$	(109.0	)	$	395.8
Mortgage/Asset-Backed Securities	0.7			—			(0.4		)	19.4		(0.1		)	—		—			19.6
All Other Corporate Bonds	829.7			(2.1		)	4.7			41.7		(32.5		)	96.2		(470.9		)	466.8
Redeemable Preferred Stocks	21.7			—			—			—		—			—		—			21.7
Total Fixed Maturity Securities	1,025.7			(2.0		)	21.4			91.1		(48.3		)	395.9		(579.9		)	903.9
Equity Securities	1.5			(0.4		)	(1.7		)	2.0		—			9.0		—			10.4
Embedded Derivative in Modified Coinsurance Arrangement	(96.3		)	(24.4		)	—			—		—			—		—			(120.7		)
	Nine Months Ended September 30, 2010
	(in millions of dollars)
				Total Realized and Unrealized Investment Gains (Losses) Included in
	Beginning of Year			Earnings			Other Comprehensive Income or Loss			Purchases		Sales			Level 3 Transfers					End of Period
															Into		Out of
Fixed Maturity Securities
States, Municipalities, and Political Subdivisions	$	—		$	—		$	0.5		$	17.7	$	—		$	—	$	—		$	18.2
Public Utilities	264.3			(1.0		)	9.9			—		(8.1		)	112.5		(219.7		)	157.9
Mortgage/Asset-Backed Securities	4.7			—			0.3			—		(4.3		)	—		—			0.7
All Other Corporate Bonds	580.0			(1.8		)	47.5			3.1		(41.8		)	208.6		(273.0		)	522.6
Redeemable Preferred Stocks	20.4			—			—			—		—			—		(20.3		)	0.1
Total Fixed Maturity Securities	869.4			(2.8		)	58.2			20.8		(54.2		)	321.1		(513.0		)	699.5
Equity Securities	1.5			—			2.4			6.9		(0.1		)	—		—			10.7
Embedded Derivative in Modified Coinsurance Arrangement	(117.4		)	(3.7		)	—			—		—			—		—			(121.1		)

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. Losses for the three and nine months ended September 30, 2011 which are included in earnings and are attributable to the change in unrealized gains or losses relating to assets or liabilities valued using significant unobservable inputs and still held at the end of that period were $33.7 million and $24.4 million, respectively. Gains (losses) for the three and nine months ended September 30, 2010 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 the end of that period were $1.6 million and $(3.7) 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.

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Carrying Amount and Fair Value of Financial Instruments (Detail) (USD $) In Millions	Sep. 30, 2011	Dec. 31, 2010
Assets
Fixed Maturity Securities	$ 42,434.7	$ 40,035.6
Mortgage Loans	1,606.9	1,516.8
Policy Loans	3,075.1	2,996.1
Other Long-term Investments
Derivatives	143.2	99.1
Equity Securities	10.4	10.4
Miscellaneous Long-term Investments	611.1	529.3
Policyholders' Funds
Short-term Debt	342.4	225.1
Long-term Debt	2,586.5	2,631.3
Other Liabilities
Derivatives	275.4	295.9
Unfunded Commitments to Investment Partnerships	158.6
Carrying Amount
Assets
Available-for-sale Securities, Fair Value Disclosure	42,434.7	40,035.6
Mortgage Loans	1,606.9	1,516.8
Policy Loans	3,075.1	2,996.1
Other Long-term Investments
Derivatives	143.2	99.1
Equity Securities	10.4	10.4
Miscellaneous Long-term Investments	457.5	419.8
Policyholders' Funds
Deferred Annuity Products	642.5	656.3
Supplementary Contracts without Life Contingencies	491.8	508.5
Short-term Debt	342.4	225.1
Long-term Debt	2,586.5	2,631.3
Other Liabilities
Derivatives	154.7	199.6
Embedded Derivative in Modified Coinsurance Arrangement	120.7	96.3
Unfunded Commitments to Investment Partnerships	158.6	169.9
Fair Value
Assets
Available-for-sale Securities, Fair Value Disclosure	42,434.7	40,035.6
Mortgage Loans	1,789.9	1,685.4
Policy Loans	3,146.0	3,044.4
Other Long-term Investments
Derivatives	143.2	99.1
Equity Securities	10.4	10.4
Miscellaneous Long-term Investments	457.5	419.8
Policyholders' Funds
Deferred Annuity Products	642.5	656.3
Supplementary Contracts without Life Contingencies	491.8	508.5
Short-term Debt	342.4	226.8
Long-term Debt	2,589.9	2,483.8
Other Liabilities
Derivatives	154.7	199.6
Embedded Derivative in Modified Coinsurance Arrangement	120.7	96.3
Unfunded Commitments to Investment Partnerships	$ 158.6	$ 169.9

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Investments - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010	Dec. 31, 2010
Schedule of Investments [Line Items]
Available for Sale Securities Other Than Temporary Impairments in Accumulated Other Comprehensive Income Loss	$ 0		$ 0		$ 3,900,000
Fair value of fixed maturity securities, gross unrealized gain	5,957,600,000		5,957,600,000		3,726,400,000
Fair Value of fixed maturity securities, gross unrealized loss	269,600,000		269,600,000		237,400,000
Defaults on securities not OTTI			0
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Reductions, Securities Sold	0	0	8,500,000	0
Commitment to fund private placement fixed maturity securities	28,700,000		28,700,000
Carrying amount of variable interest entity investments	405,100,000		405,100,000
Unfunded commitment to fund tax credit partnership investments	158,600,000		158,600,000
Commitment to fund private equity investments	57,300,000		57,300,000
Other Long-term Investments	611,100,000		611,100,000		529,300,000
Commitments to fund special purpose entity	500,000		500,000
Mortgage Loan policy is not to exceed a loan-to-value ratio, percent	75.00%		75.00%
Mortage Loan Policy Debt Service coverage ratio lower range	125.00%		125.00%
Mortgage Loans issuance, term years	25		25
Impaired Financing Receivable, Average Recorded Investment	26,400,000		20,900,000
Interest income recognized on mortgage loans subsequent to impairment	200,000		600,000
Real Estate Acquired Through Foreclosure	9,800,000		9,800,000
realized loss on foreclosure			0
Financing Receivable, Recorder Investment, Nonaccrual status	2		2		0
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	10,100,000		10,100,000
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due	9,500,000		9,500,000
commitment to fund commercial mortgage loans	17,800,000		17,800,000
Minimum percent of the fair value of securities loaned or securities purchased under repurchase agreements be maintained as collateral	102.00%		102.00%
Cash Collateral for Borrowed Securities	342,400,000		342,400,000
Securities Loaned	344,500,000		344,500,000
Securities Received as Collateral	15,400,000		15,400,000
Repurchase agreements - Typical Days outstanding			30
Outstanding Repurchase Agreements	0.0		0.0
Nonperforming Financing Receivable [Member]
Schedule of Investments [Line Items]
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	90		90
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due	30		30
External Credit Rating, Investment Grade
Schedule of Investments [Line Items]
Fair value of fixed maturity securities	39,732,200,000		39,732,200,000
Fair value of fixed maturity securities, gross unrealized gain	5,889,000,000		5,889,000,000
Fair Value of fixed maturity securities, gross unrealized loss	146,000,000		146,000,000
Fixed maturity securities in unrealized loss position, percent of total	54.20%		54.20%
Number of fixed maturity securities that were in an unrealized loss position	96		96
Number of fixed maturity securities in an unrealized loss position continuously for over one year	44		44
External Credit Rating, Non Investment Grade
Schedule of Investments [Line Items]
Fair value of fixed maturity securities	2,702,500,000		2,702,500,000
Fair value of fixed maturity securities, gross unrealized gain	68,600,000		68,600,000
Fair Value of fixed maturity securities, gross unrealized loss	123,600,000		123,600,000
Fixed maturity securities in unrealized loss position, percent of total	45.80%		45.80%
Number of fixed maturity securities that were in an unrealized loss position	82		82
Number of fixed maturity securities in an unrealized loss position continuously for over one year	23		23
Partnership Interests In Tax Credit Investments
Schedule of Investments [Line Items]
Carrying amount of variable interest entity investments	310,200,000		310,200,000
Equity Method Investments
Schedule of Investments [Line Items]
Carrying amount of variable interest entity investments	94,900,000		94,900,000
Bonds
Schedule of Investments [Line Items]
Fair value of fixed maturity securities	122,800,000		122,800,000
Nonredeemable Preferred Stock
Schedule of Investments [Line Items]
Other Long-term Investments	100,000		100,000
Partnership Interest
Schedule of Investments [Line Items]
Other Long-term Investments	$ 8,500,000		$ 8,500,000

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Mortgage Loans, Sorted by Applicable Credit Quality Indicators, Internal rating (Detail) (USD $) In Millions	Sep. 30, 2011	Dec. 31, 2010
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans	$ 1,606.9	$ 1,516.8
Aa
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans	18.0	19.0
A
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans	702.6	744.4
Baa
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans	842.2	732.9
Ba
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans	31.0	20.5
B
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans	$ 13.1	$ 0

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Stockholders' Equity and Earnings Per Common Share (Tables)

9 Months Ended

Sep. 30, 2011

Notes to Financial Statements [Abstract]

Net Income Per Common Share

Net income per common share is determined as follows:

	Three Months Ended September 30				Nine Months Ended September 30
	2011		2010		2011		2010
	(in millions of dollars, except share data)
Numerator
Net Income	$	205.6	$	220.8	$	660.8	$	660.3
Denominator (000s)
Weighted Average Common Shares - Basic	298,185.8		323,083.5		305,694.5		328,828.6
Dilution for Assumed Exercises of Stock Options and Nonvested Stock Awards	987.1		1,383.5		1,223.9		1,344.5
Weighted Average Common Shares - Assuming Dilution	299,172.9		324,467.0		306,918.4		330,173.1
Net Income Per Common Share
Basic	$	0.69	$	0.68	$	2.16	$	2.01
Assuming Dilution	$	0.69	$	0.68	$	2.15	$	2.00

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Stockholders' Equity and Earnings Per Common Share

9 Months Ended

Sep. 30, 2011

Notes to Financial Statements [Abstract]

Stockholders' Equity and Earnings Per Common Share

Stockholders' Equity and Earnings Per Common Share

Net income per common share is determined as follows:

	Three Months Ended September 30				Nine Months Ended September 30
	2011		2010		2011		2010
	(in millions of dollars, except share data)
Numerator
Net Income	$	205.6	$	220.8	$	660.8	$	660.3
Denominator (000s)
Weighted Average Common Shares - Basic	298,185.8		323,083.5		305,694.5		328,828.6
Dilution for Assumed Exercises of Stock Options and Nonvested Stock Awards	987.1		1,383.5		1,223.9		1,344.5
Weighted Average Common Shares - Assuming Dilution	299,172.9		324,467.0		306,918.4		330,173.1
Net Income Per Common Share
Basic	$	0.69	$	0.68	$	2.16	$	2.01
Assuming Dilution	$	0.69	$	0.68	$	2.15	$	2.00

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

The outstanding stock options have exercise prices ranging from $11.37 to $26.29, the nonvested stock awards have grant prices ranging from $10.59 to $26.31, and the performance restricted stock units have a threshold stock price of $26.00.

In computing earnings per share assuming dilution, only potential common shares that are dilutive (those that reduce earnings per share) are included. Potential common shares not included in the computation of dilutive earnings per share because their impact would be antidilutive, based on current market prices, approximated 2.4 million and 2.1 million shares of common stock for the three and nine month periods ended September 30, 2011, and 3.6 million common shares for the three and nine month periods ended September 30, 2010.

In May 2010, our board of directors authorized the repurchase of up to $500.0 million of Unum Group’s common stock. For the three and nine month periods ended September 30, 2010, we repurchased 9.5 million and 15.2 million shares for $197.7 million and $327.5 million, respectively, including commissions of $0.2 million and $0.3 million. For the year ended December 31, 2010, we repurchased 16.4 million shares at a cost of $356.0 million, including commissions of $0.3 million, under this share repurchase program.

On February 2, 2011, our board of directors authorized the repurchase of up to $1.0 billion of Unum Group's common stock, in addition to the amount remaining to be repurchased under the $500.0 million authorization. The $1.0 billion share repurchase program has an expiration date of August 2012.

On February 4, 2011, we repurchased 7.1 million shares, at a cost of $200.0 million, using an accelerated repurchase agreement with a financial counterparty. As part of this transaction, we simultaneously entered into a forward contract indexed to the price of Unum Group common stock, which subjected the transaction to a future price adjustment. Under the terms of the repurchase agreement, we were to receive, or be required to pay, a price adjustment based on the volume weighted average price of Unum Group common stock during the term of the agreement, less a discount. Any price adjustment payable to us was to be settled in shares of Unum Group common stock. Any price adjustment we would have been required to pay would have been settled in either cash or common stock. The final price adjustment settlement occurred on March 18, 2011 resulting in the delivery to us of 0.6 million additional shares. In total, we repurchased 7.7 million shares pursuant to the accelerated repurchase agreement, which completed the $500.0 million repurchase authorization and initiated the $1.0 billion repurchase program.

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

In addition to these repurchases, for the three and nine month periods ended September 30, 2011, we repurchased an additional 11.1 million and 17.7 million shares on the open market at a cost of $250.2 million and $419.9 million, respectively, including commissions of $0.2 million and $0.3 million. The dollar value of shares remaining under the $1.0 billion repurchase program at September 30, 2011 is $524.7 million.

Pursuant to these repurchase programs, we retired 7.7 million shares during the first quarter of 2011. All other repurchased shares have been classified as treasury stock and accounted for using the cost method.

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

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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Net Income	$ 205.6	$ 220.8	$ 660.8	$ 660.3
Change in Net Unrealized Gains on Securities Before Reclassification Adjustment:
Change in Net Unrealized Gains on Securities Not Other-Than-Temporarily Impaired (net of tax expense of $599.6; $474.7; $754.9; $1,071.9)	1,124.5	906.2	1,419.0	2,035.3
Change in Net Unrealized Gains on Securities Other-Than-Temporarily Impaired (net of tax expense (benefit) of $ - ; $0.5; $(1.1); $ - )	0	1.0	(2.1)	0.1
Total Change in Net Unrealized Gains on Securities Before Reclassification Adjustment (net of tax expense of $599.6; $475.2; $753.8; $1,071.9)	1,124.5	907.2	1,416.9	2,035.4
Reclassification Adjustment for Net Realized Investment Gain (net of tax expense of $3.4; $0.4; $4.6; $1.1)	(5.3)	(1.5)	(7.7)	(3.3)
Change in Net Gain on Cash Flow Hedges (net of tax expense (benefit) of $34.7; $(6.0); $32.0; $22.9)	65.2	(11.7)	60.1	42.2
Change in Adjustment to Reserves for Future Policy and Contract Benefits, Net of Reinsurance and Other (net of tax benefit of $378.5; $472.6; $500.2; $1,015.6)	(705.3)	(894.2)	(934.0)	(1,923.8)
Change in Foreign Currency Translation Adjustment (net of tax expense of $ - ; $0.6; $ - ; $0.6)	(34.1)	53.3	(6.0)	(24.7)
Change in Unrecognized Pension and Postretirement Benefit Costs (net of tax expense (benefit) of $2.8; $1.9; $6.9; $(3.6))	5.2	2.8	15.0	27.0
Total Other Comprehensive Income	450.2	55.9	544.3	152.8
Comprehensive Income	$ 655.8	$ 276.7	$ 1,205.1	$ 813.1

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Before-Tax Credit Related Portion of Other-Than-Temporary Impairments on Fixed Maturity Securities Still Held and Recognized in Other Comprehensive Income (Detail) (USD $) In Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010	Dec. 31, 2010	Jun. 30, 2010	Dec. 31, 2009
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Balance at Beginning of Year	$ 0	$ 0	$ 8.5	$ 0
Sales or Maturities of Securities in the Period	0	0	(8.5)	0
Balance at End of Period	$ 0	$ 18.3	$ 0	$ 18.3	$ 8.5	$ 0	$ 18.3

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Derivative Financial Instruments

9 Months Ended

Sep. 30, 2011

Notes to Financial Statements [Abstract]

Derivative Financial Instruments

Derivative Financial Instruments

Purpose of Derivatives

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

Our cash flow hedging programs are as follows:

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

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

• Options on forward interest rate swaps are used to hedge the interest rate risk on certain insurance liabilities with minimum interest rate guarantees. By purchasing options on interest rate swaps, we are able to lock in the minimum investment yields needed to meet the required interest rate guarantee on the insurance liabilities.

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

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

Our fair value hedging programs are as follows:

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

Derivative Risks

The basic types of risks associated with derivatives are market risk (that the value of the derivative will be adversely impacted by changes in the market, primarily the change in interest and exchange rates) and credit risk (that the counterparty will not perform according to the terms of the contract). The market risk of the derivatives should generally offset the market risk associated with the hedged financial instrument or liability.

To help limit the credit exposure of the derivatives, we enter into master netting agreements with our counterparties whereby contracts in a gain position can be offset against contracts in a loss position. We also typically enter into bilateral, cross-collateralization agreements with our counterparties to help limit the credit exposure of the derivatives. These agreements require the counterparty in a loss position to submit acceptable collateral with the other counterparty in the event the net loss

position meets or exceeds an agreed upon amount. Our current credit exposure on derivatives, which is limited to the value of those contracts in a net gain position less collateral held, was $23.2 million at September 30, 2011. We held no cash collateral from our counterparties as of September 30, 2011. We held cash collateral of $39.1 million from our counterparties as of December 31, 2010. This unrestricted cash collateral is included in short-term investments, and the associated obligation to return the collateral to our counterparties is included in other liabilities in our consolidated balance sheets. We post either fixed maturity securities or cash as collateral to our counterparties. The carrying value of fixed maturity securities posted as collateral to our counterparties was $131.6 million and $158.8 million at September 30, 2011 and December 31, 2010, respectively. We had no cash posted as collateral to our counterparties at September 30, 2011 and December 31, 2010.

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 $154.7 million and $199.6 million at September 30, 2011 and December 31, 2010, respectively.

Hedging Activity

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

	Swaps
	Receive Variable/Pay Fixed		Receive Fixed/Pay Fixed		Receive Fixed/Pay Variable		Forwards		Total
			(in millions of dollars)
Balance at June 30, 2011	$	174.0	$	579.7	$	785.0	$	—	$	1,538.7
Additions	—		—		—		15.0		15.0
Terminations	—		5.0		50.0		—		55.0
Balance at September 30, 2011	$	174.0	$	574.7	$	735.0	$	15.0	$	1,498.7
Balance at December 31, 2010	$	174.0	$	617.9	$	890.0	$	—	$	1,681.9
Additions	—		—		—		46.9		46.9
Terminations	—		43.2		155.0		31.9		230.1
Balance at September 30, 2011	$	174.0	$	574.7	$	735.0	$	15.0	$	1,498.7

The following table summarizes the timing of anticipated settlements of interest rate swaps outstanding under our cash flow hedging programs at September 30, 2011, whereby we receive a fixed rate and pay a variable rate. The weighted average variable interest rates assume current market conditions.

	2011			2012			2013			Total
				(in millions of dollars)
Notional Value	$	50.0		$	185.0		$	150.0		$	385.0
Weighted Average Receive Rate	5.16		%	6.49		%	6.34		%	6.26		%
Weighted Average Pay Rate	0.37		%	0.37		%	0.37		%	0.37		%

Cash Flow Hedges

As of September 30, 2011 and December 31, 2010, we had $385.0 million and $540.0 million, respectively, notional amount of forward starting interest rate swaps to hedge the anticipated purchase of fixed maturity securities.

As of September 30, 2011 and December 31, 2010, we had $574.7 million and $617.9 million, respectively, notional amount of open current and forward foreign currency swaps to hedge fixed income foreign dollar-denominated securities.

As of September 30, 2011, we had $15.0 million notional amount of open forward treasury locks to hedge the interest rate risk associated with the anticipated proceeds to be received from the call of specific fixed maturity securities. During the nine months ended September 30, 2011, we also entered into and subsequently terminated $31.9 million notional amount of forward treasury locks used to minimize interest rate risk associated with the anticipated disposal of certain fixed maturity securities. These treasury locks were terminated at the time the securities were called and/or sold, and we recognized a gain of $0.1 million on the termination of these hedges. The gain was recognized in other comprehensive income and subsequently amortized into net investment income. We had no open forward treasury locks at December 31, 2010.

During the third quarter of 2010, we terminated $250.0 million notional amount of forward starting interest rate swaps used to hedge the interest rate risk associated with the anticipated issuance of long-term debt. The swaps were terminated at the time the debt was issued. We recognized a loss of $18.5 million on the termination of these hedges. This loss was recognized in other comprehensive income and is being amortized into earnings as a component of interest and debt expense, which has the effect of increasing the periodic interest expense on our debt issued in 2010.

For the nine months ended September 30, 2011 and 2010, there was no material ineffectiveness related to our cash flow hedges, and no component of the derivative instruments’ gain or loss was excluded from the assessment of hedge effectiveness.

As of September 30, 2011, we expect to amortize approximately $33.6 million of net deferred gains on derivative instruments during the next twelve months. This amount will be reclassified from accumulated other comprehensive income into earnings and reported on the same income statement line item as the hedged item. The income statement line items that will be affected by this amortization are net investment income and interest and debt expense. The estimated amortization includes the impact of certain derivative contracts that have not yet been terminated as of September 30, 2011. Fluctuations in fair values of these derivatives between September 30, 2011 and the date of termination will vary our projected amortization. Amounts that will be reclassified from accumulated other comprehensive income into earnings to offset the earnings impact of foreign currency translation of hedged items are not estimable.

As of September 30, 2011, we are hedging the variability of future cash flows associated with forecasted transactions through the year 2038.

Fair Value Hedges

As of September 30, 2011 and December 31, 2010, we had $174.0 million notional amount of receive variable, pay fixed interest rate swaps to hedge the changes in fair value of certain fixed rate securities held. These swaps effectively convert the associated fixed rate securities into floating rate securities, which are used to fund our floating rate long-term debt. Changes in the fair value of the derivative and changes in the fair value of the hedged item attributable to the risk being hedged are recognized in current earnings as a component of net realized investment gain or loss during the period of change in fair value.  For the nine months ended September 30, 2011 and 2010, the change in fair value of the hedged fixed maturity securities attributable to the hedged benchmark interest rate resulted in gains of $8.7 million and $15.9 million, respectively, with offsetting losses on the related interest rate swaps.

As of September 30, 2011 and December 31, 2010, we had a $350.0 million notional amount receive fixed, pay variable interest rate swap to hedge the changes in the fair value of certain fixed rate long-term debt. This swap effectively converts the associated fixed rate long-term debt into floating rate debt and provides for a better matching of interest rates with our short-term investments, which have frequent interest rate resets similar to a floating rate security. For the nine months ended September 30, 2011, the change in fair value of the hedged fixed debt attributable to the hedged benchmark interest rate resulted in a loss of $22.0 million, with an offsetting gain on the related interest rate swaps.

For the nine months ended September 30, 2011 and 2010, there was no material ineffectiveness related to our fair value hedges, and no component of the derivative instruments’ gain or loss was excluded from the assessment of hedge effectiveness. There were no instances wherein we discontinued fair value hedge accounting due to a hedged firm commitment no longer qualifying as a fair value hedge.

Derivatives Not Designated as Hedging Instruments

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

Locations and Amounts of Derivative Financial Instruments

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

	September 30, 2011
	(in millions of dollars)
	Asset Derivatives			Liability Derivatives
	Balance Sheet Location	Fair Value		Balance Sheet Location	Fair Value
Designated as Hedging Instruments
Interest Rate Swaps and Forwards	Other L-T Investments	$	140.8	Other Liabilities	$	33.5
Foreign Exchange Contracts	Other L-T Investments	2.4		Other Liabilities	121.2
Total		$	143.2		$	154.7
Not Designated as Hedging Instruments
Embedded Derivative in Modified Coinsurance Arrangement				Other Liabilities	$	120.7

	December 31, 2010
	(in millions of dollars)
	Asset Derivatives			Liability Derivatives
	Balance Sheet Location	Fair Value		Balance Sheet Location	Fair Value
Designated as Hedging Instruments
Interest Rate Swaps	Other L-T Investments	$	98.4	Other Liabilities	$	39.1
Foreign Exchange Contracts	Other L-T Investments	0.7		Other Liabilities	160.5
Total		$	99.1		$	199.6
Not Designated as Hedging Instruments
Embedded Derivative in Modified Coinsurance Arrangement				Other Liabilities	$	96.3

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

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

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

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

(3) Loss recognized in interest and debt expense

	Three Months Ended September 30, 2010
	Loss Recognized in OCI on Derivatives (Effective Portion)			Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)				Gain (Loss) Recognized in Income on Derivatives (Ineffective Portion)
	(in millions of dollars)
Interest Rate Swaps and Forwards	$	(7.7	)	$	6.9		(1)	$	—
Interest Rate Swaps	—			1.6			(2)	—
Interest Rate Swaps	—			(0.1		)	(3)	—
Foreign Exchange Contracts	—			(0.4		)	(1)	—
Foreign Exchange Contracts	(34.5		)	(21.2		)	(2)	—
Foreign Exchange Contracts	—			0.7			(3)	—
Total	$	(42.2	)	$	(12.5	)		$	—

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

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

(3) Gain (loss) recognized in interest and debt expense

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

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

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

(3) Loss recognized in interest and debt expense

	Nine Months Ended September 30, 2010
	Gain (Loss) Recognized in OCI on Derivatives (Effective Portion)			Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)				Gain (Loss) Recognized in Income on Derivatives (Ineffective Portion)
	(in millions of dollars)
Interest Rate Swaps and Forwards	$	16.8		$	22.5		(1)	$	—
Interest Rate Swaps	—			4.2			(2)	—
Interest Rate Swaps	—			(0.1		)	(3)	—
Interest Rate Swaps	—			(0.1		)	(4)	—
Foreign Exchange Contracts	—			(1.5		)	(1)	—
Foreign Exchange Contracts	(3.9		)	(7.7		)	(2)	—
Foreign Exchange Contracts	—			1.9			(3)	—
Total	$	12.9		$	19.2			$	—

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

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

(3) Gain (loss) recognized in interest and debt expense

(4) Loss recognized in other income

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

	Three Months Ended September 30					Nine Months Ended September 30
	2011			2010		2011			2010
	(in millions of dollars)
Gain (Loss) Recognized in Net Realized Investment Gain (Loss)	$	(33.7	)	$	1.6	$	(24.4	)	$	(3.7	)

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Other

9 Months Ended

Sep. 30, 2011

Notes to Financial Statements [Abstract]

Other

Debt

During the nine months ended September 30, 2011, we made principal payments of $59.4 million and $7.5 million on our senior secured non-recourse floating rate notes issued by Northwind Holdings, LLC and Tailwind Holdings, LLC, respectively.

During the first quarter of 2011, the remaining $225.1 million of our 7.625% senior notes due March 2011 matured.

At September 30, 2011, short-term debt consisted of $342.4 million of securities lending transactions.

Income Tax

At September 30, 2011, we had a liability of $133.5 million for unrecognized tax benefits, $118.3 million of which is associated with deferred tax assets. The total unrecognized tax benefit that would impact the effective tax rate, if recognized, is $15.2 million. The interest expense and penalties related to unrecognized tax expense in our consolidated statements of income was $1.5 million and $4.1 million for the three and nine months ended September 30, 2011, respectively, and $1.5 million and $4.0 million for the three and nine months ended September 30, 2010, respectively.

During 2009, we had a conference with the Internal Revenue Service (IRS) with respect to our appeal of audit adjustments for the years 1999 to 2004. Although we have not yet reached a final settlement with the IRS for these years, it is reasonably possible that this appeal will be resolved in whole or in part within 12 months and that statutes of limitations may expire in multiple jurisdictions within the same period.  As a result, it is reasonably possible that our liability for unrecognized tax benefits could decrease within 12 months by $0 million to $55.0 million.  We believe sufficient provision has been made for all uncertain tax provisions and that any adjustments by tax authorities with respect to such positions would not have a material adverse effect on our financial position, liquidity, or results of operations.

The income tax rate in the U.K. is expected to be reduced annually, at least one percent per year, beginning in April 2011, with the ultimate goal of reducing the rate from 28 percent to 23 percent. An income tax rate reduction was enacted which reduced the tax rate from 28 percent to 27 percent in the third quarter of 2010, effective April 2011. In the third quarter of 2011, an income tax rate reduction was enacted which reduced the tax rate from 27 percent to 26 percent, retroactive to April 2011, and from 26 percent to 25 percent, effective April 2012.  We are required to adjust deferred tax assets and liabilities through income on the date of enactment of a rate change, and as such, we recorded a reduction of $6.8 million and $2.7 million to our income tax expense during the third quarters of 2011 and 2010, respectively.

In March 2010, the Patient Protection and Affordable Care Act and the Health Care and Education Reconciliation Act of 2010 were signed into law.  Among other things, the new legislation reduces the tax benefits available to an employer that receives a postretirement prescription drug coverage subsidy from the federal government under the Medicare Prescription Drug, Improvement and Modernization Act of 2003.  Under the new legislation, to the extent our future postretirement prescription drug coverage expenses are reimbursed under the subsidy program, the expenses covered by the subsidy will no longer be tax deductible after 2012.  Employers that receive the subsidy must recognize the deferred tax effects relating to the future postretirement prescription drug coverage in the period the legislation was enacted.  Our income tax expense for the first nine months of 2010 includes a non-cash tax charge of $10.2 million which was recorded in the first quarter of 2010 to reflect the impact of the tax law change.

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Segment Information

9 Months Ended

Sep. 30, 2011

Notes to Financial Statements [Abstract]

Segment Information

Segment Information

Our reporting segments are comprised of the following: Unum US, Unum UK, Colonial Life, Individual Disability - Closed Block, and Corporate and Other.

Premium income by major line of business within each of our segments is presented as follows. Certain prior year amounts within Unum UK have been reclassified to conform to current year presentation.

	Three Months Ended September 30					Nine Months Ended September 30
	2011			2010		2011			2010
	(in millions of dollars)
Unum US
Group Disability
Group Long-term Disability	$	393.7		$	404.9	$	1,185.3		$	1,233.6
Group Short-term Disability	115.2			108.7		339.0			322.5
Group Life and Accidental Death & Dismemberment
Group Life	277.6			273.0		825.3			814.5
Accidental Death & Dismemberment	27.7			27.0		81.6			79.3
Supplemental and Voluntary
Individual Disability - Recently Issued	116.6			116.7		348.3			349.5
Long-term Care	152.1			149.4		453.5			448.1
Voluntary Benefits	143.6			130.9		433.5			395.7
	1,226.5			1,210.6		3,666.5			3,643.2
Unum UK
Group Long-term Disability	107.3			101.8		318.3			310.7
Group Life	52.1			44.5		151.6			126.8
Supplemental and Voluntary	16.1			15.1		48.5			42.6
	175.5			161.4		518.4			480.1
Colonial Life
Accident, Sickness, and Disability	174.3			166.1		519.7			493.1
Life	47.0			43.4		140.0			131.0
Cancer and Critical Illness	62.4			59.8		186.4			178.0
	283.7			269.3		846.1			802.1
Individual Disability - Closed Block	196.4			208.5		595.0			635.0
Corporate and Other	(0.9		)	0.4		(0.3		)	2.8
Total	$	1,881.2		$	1,850.2	$	5,625.7		$	5,563.2

Note 6 - Segment Information - Continued

Selected operating statement data by segment is presented as follows:

	Unum US		Unum UK		Colonial Life		Individual Disability - Closed Block		Corporate and Other			Total
	(in millions of dollars)
Three Months Ended September 30, 2011
Premium Income	$	1,226.5	$	175.5	$	283.7	$	196.4	$	(0.9	)	$	1,881.2
Net Investment Income	332.4		43.3		32.5		181.9		39.1			629.2
Other Income	30.4		—		0.1		23.6		5.0			59.1
Operating Revenue	$	1,589.3	$	218.8	$	316.3	$	401.9	$	43.2		$	2,569.5
Operating Income (Loss)	$	219.5	$	34.9	$	70.3	$	14.0	$	(21.5	)	$	317.2
Three Months Ended September 30, 2010
Premium Income	$	1,210.6	$	161.4	$	269.3	$	208.5	$	0.4		$	1,850.2
Net Investment Income	312.9		39.0		31.9		185.5		49.1			618.4
Other Income	29.7		0.2		0.2		22.7		5.4			58.2
Operating Revenue	$	1,553.2	$	200.6	$	301.4	$	416.7	$	54.9		$	2,526.8
Operating Income (Loss)	$	204.7	$	47.2	$	74.5	$	9.8	$	(10.8	)	$	325.4
Nine Months Ended September 30, 2011
Premium Income	$	3,666.5	$	518.4	$	846.1	$	595.0	$	(0.3	)	$	5,625.7
Net Investment Income	983.1		139.3		99.6		544.2		118.8			1,885.0
Other Income	91.1		0.1		0.4		67.9		15.3			174.8
Operating Revenue	$	4,740.7	$	657.8	$	946.1	$	1,207.1	$	133.8		$	7,685.5
Operating Income (Loss)	$	646.7	$	138.3	$	214.5	$	34.3	$	(60.0	)	$	973.8
Nine Months Ended September 30, 2010
Premium Income	$	3,643.2	$	480.1	$	802.1	$	635.0	$	2.8		$	5,563.2
Net Investment Income	936.2		121.9		91.1		563.5		148.5			1,861.2
Other Income	90.6		1.1		0.5		67.3		19.0			178.5
Operating Revenue	$	4,670.0	$	603.1	$	893.7	$	1,265.8	$	170.3		$	7,602.9
Operating Income (Loss)	$	619.9	$	160.7	$	221.4	$	33.9	$	(37.3	)	$	998.6

Note 6 - Segment Information - Continued

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

	Three Months Ended September 30					Nine Months Ended September 30
	2011			2010		2011			2010
	(in millions of dollars)
Operating Revenue by Segment	$	2,569.5		$	2,526.8	$	7,685.5		$	7,602.9
Net Realized Investment Gain (Loss)	(23.9		)	1.1		(12.3		)	(2.8		)
Revenue	$	2,545.6		$	2,527.9	$	7,673.2		$	7,600.1
Operating Income by Segment	$	317.2		$	325.4	$	973.8		$	998.6
Net Realized Investment Gain (Loss)	(23.9		)	1.1		(12.3		)	(2.8		)
Income Tax	87.7			105.7		300.7			335.5
Net Income	$	205.6		$	220.8	$	660.8		$	660.3

Assets by segment are as follows:

	September 30 2011		December 31 2010
	(in millions of dollars)
Unum US	$	26,701.7	$	24,876.9
Unum UK	3,568.3		3,386.3
Colonial Life	3,294.7		3,047.3
Individual Disability - Closed Block	16,109.4		15,509.1
Corporate and Other	10,366.8		10,488.1
Total	$	60,040.9	$	57,307.7

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Amortized Cost and Fair Values of Securities by Security Type (Detail) (USD $) In Millions	Sep. 30, 2011	Dec. 31, 2010
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 36,746.7	$ 36,546.6
Gross Unrealized Gain	5,957.6	3,726.4
Gross Unrealized Loss	269.6	237.4
Fixed Maturity Securities	42,434.7	40,035.6
Available for Sale Securities Other Than Temporary Impairments in Accumulated Other Comprehensive Income Loss	0	3.9
United States Government and Government Agencies and Authorities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	998.8	981.7
Gross Unrealized Gain	296.0	128.6
Gross Unrealized Loss	1.2	8.6
Fixed Maturity Securities	1,293.6	1,101.7
Available for Sale Securities Other Than Temporary Impairments in Accumulated Other Comprehensive Income Loss		0
States, Municipalities, and Political Subdivisions
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,360.5	1,271.0
Gross Unrealized Gain	229.0	21.5
Gross Unrealized Loss	3.1	47.3
Fixed Maturity Securities	1,586.4	1,245.2
Available for Sale Securities Other Than Temporary Impairments in Accumulated Other Comprehensive Income Loss		0
Foreign Governments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,254.3	1,248.6
Gross Unrealized Gain	220.4	160.7
Gross Unrealized Loss	0	0
Fixed Maturity Securities	1,474.7	1,409.3
Available for Sale Securities Other Than Temporary Impairments in Accumulated Other Comprehensive Income Loss		0
Public Utilities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	8,935.8	8,874.2
Gross Unrealized Gain	1,593.5	854.3
Gross Unrealized Loss	28.6	44.3
Fixed Maturity Securities	10,500.7	9,684.2
Available for Sale Securities Other Than Temporary Impairments in Accumulated Other Comprehensive Income Loss		0
Mortgage/Asset-backed Securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	2,764.4	3,047.8
Gross Unrealized Gain	386.5	338.3
Gross Unrealized Loss	3.9	0.6
Fixed Maturity Securities	3,147.0	3,385.5
Available for Sale Securities Other Than Temporary Impairments in Accumulated Other Comprehensive Income Loss		0
All Other Corporate Bonds
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	21,377.1	21,067.5
Gross Unrealized Gain	3,229.8	2,221.3
Gross Unrealized Loss	231.1	134.1
Fixed Maturity Securities	24,375.8	23,154.7
Available for Sale Securities Other Than Temporary Impairments in Accumulated Other Comprehensive Income Loss		3.9	[1]
Redeemable Preferred Stocks
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	55.8	55.8
Gross Unrealized Gain	2.4	1.7
Gross Unrealized Loss	1.7	2.5
Fixed Maturity Securities	56.5	55.0
Available for Sale Securities Other Than Temporary Impairments in Accumulated Other Comprehensive Income Loss		$ 0

[1] Accumulated Other Comprehensive Income (Loss)

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Investments

9 Months Ended

Sep. 30, 2011

Notes to Financial Statements [Abstract]

Investments

Investments

Fixed Maturity Securities

At September 30, 2011 and December 31, 2010, all fixed maturity securities were classified as available-for-sale. The amortized cost and fair values of securities by security type are shown as follows.

	September 30, 2011
	(in millions of dollars)
	Amortized Cost		Gross Unrealized Gain		Gross Unrealized Loss		Fair Value
United States Government and Government Agencies and Authorities	$	998.8	$	296.0	$	1.2	$	1,293.6
States, Municipalities, and Political Subdivisions	1,360.5		229.0		3.1		1,586.4
Foreign Governments	1,254.3		220.4		—		1,474.7
Public Utilities	8,935.8		1,593.5		28.6		10,500.7
Mortgage/Asset-Backed Securities	2,764.4		386.5		3.9		3,147.0
All Other Corporate Bonds	21,377.1		3,229.8		231.1		24,375.8
Redeemable Preferred Stocks	55.8		2.4		1.7		56.5
Total Fixed Maturity Securities	$	36,746.7	$	5,957.6	$	269.6	$	42,434.7

There were no other-than-temporary impairments recognized in accumulated other comprehensive income as of September 30, 2011.

	December 31, 2010
	(in millions of dollars)
	Amortized Cost		Gross Unrealized Gain		Gross Unrealized Loss		Fair Value		Other-Than- Temporary Impairments in AOCI (1)
United States Government and Government Agencies and Authorities	$	981.7	$	128.6	$	8.6	$	1,101.7	$	—
States, Municipalities, and Political Subdivisions	1,271.0		21.5		47.3		1,245.2		—
Foreign Governments	1,248.6		160.7		—		1,409.3		—
Public Utilities	8,874.2		854.3		44.3		9,684.2		—
Mortgage/Asset-Backed Securities	3,047.8		338.3		0.6		3,385.5		—
All Other Corporate Bonds	21,067.5		2,221.3		134.1		23,154.7		3.9
Redeemable Preferred Stocks	55.8		1.7		2.5		55.0		—
Total Fixed Maturity Securities	$	36,546.6	$	3,726.4	$	237.4	$	40,035.6	$	3.9

(1) Accumulated Other Comprehensive Income (Loss)

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

	September 30, 2011
	(in millions of dollars)
	Less Than 12 Months				12 Months or Greater
	Fair Value		Gross Unrealized Loss		Fair Value		Gross Unrealized Loss
United States Government and Government Agencies and Authorities	$	—	$	—	$	6.2	$	1.2
States, Municipalities, and Political Subdivisions	4.8		0.1		89.8		3.0
Public Utilities	211.8		19.7		74.7		8.9
Mortgage/Asset-Backed Securities	95.5		3.1		20.8		0.8
All Other Corporate Bonds	2,315.6		118.8		639.5		112.3
Redeemable Preferred Stocks	—		—		21.1		1.7
Total Fixed Maturity Securities	$	2,627.7	$	141.7	$	852.1	$	127.9

	December 31, 2010
	(in millions of dollars)
	Less Than 12 Months				12 Months or Greater
	Fair Value		Gross Unrealized Loss		Fair Value		Gross Unrealized Loss
United States Government and Government Agencies and Authorities	$	23.9	$	3.1	$	10.9	$	5.5
States, Municipalities, and Political Subdivisions	660.6		28.4		100.3		18.9
Public Utilities	1,073.8		41.0		41.0		3.3
Mortgage/Asset-Backed Securities	34.5		0.1		45.5		0.5
All Other Corporate Bonds	1,667.2		48.3		1,071.7		85.8
Redeemable Preferred Stocks	7.6		0.4		20.7		2.1
Total Fixed Maturity Securities	$	3,467.6	$	121.3	$	1,290.1	$	116.1

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

	September 30, 2011
	(in millions of dollars)
	Total Amortized Cost		Unrealized Gain Position				Unrealized Loss Position
			Gross Gain		Fair Value		Gross Loss		Fair Value
1 year or less	$	669.6	$	13.4	$	636.9	$	0.2	$	45.9
Over 1 year through 5 years	5,061.2		442.7		4,956.9		15.7		531.3
Over 5 years through 10 years	9,563.7		1,191.2		9,257.3		98.5		1,399.1
Over 10 years	18,687.8		3,923.8		21,073.1		151.3		1,387.2
	33,982.3		5,571.1		35,924.2		265.7		3,363.5
Mortgage/Asset-Backed Securities	2,764.4		386.5		3,030.7		3.9		116.3
Total Fixed Maturity Securities	$	36,746.7	$	5,957.6	$	38,954.9	$	269.6	$	3,479.8

	December 31, 2010
	(in millions of dollars)
	Total Amortized Cost		Unrealized Gain Position				Unrealized Loss Position
			Gross Gain		Fair Value		Gross Loss		Fair Value
1 year or less	$	685.7	$	10.9	$	532.6	$	0.4	$	163.6
Over 1 year through 5 years	4,740.6		394.1		4,886.3		5.5		242.9
Over 5 years through 10 years	9,501.6		931.6		9,415.0		37.1		981.1
Over 10 years	18,570.9		2,051.5		17,138.5		193.8		3,290.1
	33,498.8		3,388.1		31,972.4		236.8		4,677.7
Mortgage/Asset-Backed Securities	3,047.8		338.3		3,305.5		0.6		80.0
Total Fixed Maturity Securities	$	36,546.6	$	3,726.4	$	35,277.9	$	237.4	$	4,757.7

At September 30, 2011, the fair value of investment-grade fixed maturity securities was $39,732.2 million, with a gross unrealized gain of $5,889.0 million and a gross unrealized loss of $146.0 million. The gross unrealized loss on investment-grade fixed maturity securities was 54.2 percent of the total gross unrealized loss on fixed maturity securities. Unrealized losses on investment-grade fixed maturity securities principally relate to changes in interest rates or changes in market or sector credit spreads which occurred subsequent to the acquisition of the securities.

At September 30, 2011, the fair value of below-investment-grade fixed maturity securities was $2,702.5 million, with a gross unrealized gain of $68.6 million and a gross unrealized loss of $123.6 million. The gross unrealized loss on below-investment-grade fixed maturity securities was 45.8 percent of the total gross unrealized loss on fixed maturity securities. Generally, below-investment-grade fixed maturity securities are more likely to develop credit concerns than investment-grade securities. At September 30, 2011, the unrealized losses in our below-investment-grade fixed maturity securities were generally due to credit spreads in certain industries or sectors and, to a lesser extent, credit concerns related to specific securities. For each specific security in an unrealized loss position, we believe that there are positive factors which mitigate credit concerns and that the securities for which we have not recorded an other-than-temporary impairment will recover in value.

As of September 30, 2011, we held 96 individual investment-grade fixed maturity securities and 82 individual below-investment-grade fixed maturity securities that were in an unrealized loss position, of which 44 investment-grade fixed maturity securities and 23 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 all 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.

The following table presents the before-tax credit related portion of other-than-temporary impairments on fixed maturity securities still held as of the dates shown for which a portion of the other-than-temporary impairment was recognized in other comprehensive income.

	Nine Months Ended			Three and Nine Months Ended
	September 30, 2011			September 30, 2010
	(in millions of dollars)
Balance at Beginning of Period	$	8.5		$	18.3
Sales or Maturities of Securities	(8.5		)	—
Balance at End of Period	$	—		$	18.3

There was no activity for the three months ended September 30, 2011 or for the three and nine months ended September 30, 2010.

At September 30, 2011, we had non-binding commitments of $28.7 million to fund private placement fixed maturity securities. 

Variable Interest Entities

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

As of September 30, 2011, the carrying amount of our variable interest entity investments that are not consolidated under the provisions of GAAP was $405.1 million, comprised of $310.2 million of tax credit partnerships and $94.9 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 $158.6 million at September 30, 2011. 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 $57.3 million to fund certain private equity partnerships at September 30, 2011.

We are the sole beneficiary of a special purpose entity which is consolidated under the provisions of GAAP.  This entity is a securitized asset trust containing a highly rated bond for principal protection, nonredeemable preferred stock, and several partnership equity investments.  We contributed the bond and partnership investments into the trust at the time it was established.  The trust supports our investment objectives and allows us to maintain our investment in the partnerships while at the same time protecting the principal of the investment.  There are no restrictions on the assets held in this trust, and the trust is free to dispose of the assets at any time.  Because the assets in the trust are not liquid investments, we periodically provide funding to the underlying partnerships in the trust upon satisfaction of contractual notice from the partnerships.  The fair values of the bond, nonredeemable preferred stock, and partnerships were $122.8 million, $0.1 million, and $8.5 million, respectively, as of September 30, 2011.  The bonds are reported as fixed maturity securities, and the nonredeemable preferred stock and partnerships are reported as other long-term investments in our consolidated balance sheets. At September 30, 2011, we had non-binding commitments to fund approximately $0.5 million to the underlying partnerships.  The amount of funding provided to the partnerships during the three and nine months ended September 30, 2011 and 2010 was de minimis.

Mortgage Loans

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

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

	September 30, 2011				December 31, 2010
	Carrying		Percent of		Carrying		Percent of
	Amount		Total		Amount		Total
	(in millions of dollars)
Property Type
Apartment	$	28.1	1.7	%	$	33.7	2.2	%
Industrial	518.2		32.3		458.2		30.2
Mixed	94.1		5.9		95.8		6.3
Office	658.1		41.0		634.7		41.9
Retail	301.2		18.7		286.9		18.9
Other	7.2		0.4		7.5		0.5
Total	$	1,606.9	100.0	%	$	1,516.8	100.0	%

Region
New England	$	148.2	9.2	%	$	146.8	9.7	%
Mid-Atlantic	172.3		10.7		184.8		12.2
East North Central	214.0		13.3		171.7		11.3
West North Central	152.4		9.5		134.6		8.9
South Atlantic	390.5		24.3		372.0		24.5
East South Central	52.7		3.3		26.9		1.8
West South Central	161.9		10.1		171.8		11.3
Mountain	59.2		3.7		60.7		4.0
Pacific	255.7		15.9		247.5		16.3
Total	$	1,606.9	100.0	%	$	1,516.8	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:

	September 30 2011		December 31 2010
	(in millions of dollars)
Internal Rating
Aa	$	18.0	$	19.0
A	702.6		744.4
Baa	842.2		732.9
Ba	31.0		20.5
B	13.1		—
Total	$	1,606.9	$	1,516.8

Loan-to-Value Ratio
<= 65%	$	558.0	$	425.3
> 65% <= 75%	806.4		869.2
> 75% <= 85%	169.7		161.9
> 85% <= 100%	72.8		60.4
Total	$	1,606.9	$	1,516.8

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

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

	Three and Nine Months Ended September 30 2011		Three Months Ended September 30 2010		Nine Months Ended September 30 2010
	(in millions of dollars)
Balance at Beginning of Period	$	1.5	$	0.5	$	3.2
Provision	—		0.4		0.9
Charge-offs, Net of Recoveries	—		—		(3.2		)
Balance at End of Period	$	1.5	$	0.9	$	0.9

Impaired mortgage loans are as follows:

	September 30, 2011
	(in millions of dollars)
			Unpaid
	Recorded		Principal		Related
	Investment		Balance		Allowance
With No Related Allowance Recorded	$	19.6	$	19.6	$	—
With an Allowance Recorded	13.1		14.6		1.5
Total	$	32.7	$	34.2	$	1.5
	December 31, 2010
	(in millions of dollars)
			Unpaid
	Recorded		Principal		Related
	Investment		Balance		Allowance
With No Related Allowance Recorded	$	9.8	$	9.8	$	—
With an Allowance Recorded	13.1		14.6		1.5
Total	$	22.9	$	24.4	$	1.5

During the three and nine months ended September 30, 2011, our average investment in impaired mortgage loans was $26.4 million and $20.9 million, respectively. For the three and nine months ended September 30, 2011, we recognized $0.2 million and $0.6 million of interest income, respectively, on mortgage loans subsequent to impairment.

We had no troubled debt restructurings for the three months ended September 30, 2011. During the nine months ended September 30, 2011, we foreclosed on a previously impaired mortgage loan with a book value of $9.8 million and transferred it into other long-term investments in our consolidated balance sheets. No realized loss was recognized on this troubled debt restructuring.

As of September 30, 2011, we held two mortgage loans that were past due regarding principal and interest payments and for which we had discontinued the accrual of investment income. One loan was greater than 90 days past due and had a carrying value of $10.1 million, and the other loan was greater than 30 days past due and had a carrying value of $9.5 million. As of December 31, 2010, none of our mortgage loans were past due regarding principal and interest payments, and none were on nonaccrual status.

At September 30, 2011, we had non-binding commitments of $17.8 million to fund certain commercial mortgage loans.

Transfers of Financial Assets

To manage our cash position more efficiently, we 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 transactions. These transactions 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 transactions and repurchase agreements as collateralized financings. As of September 30, 2011, the carrying amount of fixed maturity securities loaned to third parties under our securities lending program was $344.5 million, for which we received collateral in the form of cash and securities of $342.4 million and $15.4 million, respectively. We had no outstanding repurchase agreements at September 30, 2011.

Realized Investment Gain and Loss

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

	Three Months Ended September 30						Nine Months Ended September 30
	2011			2010			2011			2010
	(in millions of dollars)
Fixed Maturity Securities
Gross Gains on Sales	$	14.8		$	6.0		$	33.0		$	35.4
Gross Losses on Sales	(5.4		)	(4.1		)	(22.1		)	(25.8		)
Other-Than-Temporary Impairment Loss	(1.2		)	—			(4.2		)	(10.4		)
Mortgage Loans and Other Invested Assets
Gross Gains on Sales	1.6			0.3			7.1			6.9
Gross Losses on Sales	—			—			(0.2		)	(0.5		)
Impairment Loss	(0.4		)	(0.4		)	(0.4		)	(2.1		)
Foreign Currency Transactions	0.4			(2.3		)	(1.1		)	(2.6		)
Embedded Derivative in Modified Coinsurance Arrangement	(33.7		)	1.6			(24.4		)	(3.7		)
Net Realized Investment Gain (Loss)	$	(23.9	)	$	1.1		$	(12.3	)	$	(2.8	)

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Reconciliation of Total Operating Revenue and Operating Income by Segment to Revenue and Net Income (Detail) (USD $) In Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Segment Reporting, Revenue Reconciling Item [Line Items]
Operating Revenue	$ 2,569.5	$ 2,526.8	$ 7,685.5	$ 7,602.9
Realized Investment Gains (Losses)	(23.9)	1.1	(12.3)	(2.8)
Revenues	2,545.6	2,527.9	7,673.2	7,600.1
Operating Income (Loss)	317.2	325.4	973.8	998.6
Income Tax Expense (Benefit)	87.7	105.7	300.7	335.5
Net Income (Loss) Attributable to Parent	$ 205.6	$ 220.8	$ 660.8	$ 660.3

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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Parenthetical) (Retained Earnings, USD $)	9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010
Retained Earnings
Dividends to Stockholders, per common share	$ 0.2900	$ 0.2575

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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) (USD $) In Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Change in Net Unrealized Gains and Losses on Securities Not Other-Than-Temporarily Impaired, tax expense	$ 599.6	$ 474.7	$ 754.9	$ 1,071.9
Change in Net Unrealized Gains and Losses on Securities Other-Than-Temporarily Impaired, tax expense (benefit)	0	0.5	(1.1)	0
Total Change in Net Unrealized Gains and Losses on Securities Before Reclassification Adjustment, tax expense	599.6	475.2	753.8	1,071.9
Reclassification Adjustment for Net Realized Investment (Gain) Loss, tax expense	3.4	0.4	4.6	1.1
Change in Net Gain on Cash Flow Hedges, tax expens (benefit)	34.7	(6.0)	32.0	22.9
Change in Adjustment to Reserves for Future Policy and Contract Benefits, Net of Reinsurance and Other, tax benefit	(378.5)	(472.6)	(500.2)	(1,015.6)
Change in Unrecognized Pension and Postretirement Benefit Costs, tax expense (benefit)	$ 2.8	$ 1.9	$ 6.9	$ (3.6)

XML

Activity in Allowance for Credit Losses (Detail) (USD $) In Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance at Beginning of Year		$ 0.5	$ 1.5	$ 3.2
Financing Receivable, Allowance for Credit Losses, Provisions	0	0.4	0	0.9
Charge-offs, Net of Recoveries	0	0	0	(3.2)
Balance at End of Period	$ 1.5	$ 0.9	$ 1.5	$ 0.9

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Fair Values of Financial Instruments - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010	Dec. 31, 2010
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying amount of policy loans	$ 3,075.1		$ 3,075.1		$ 2,996.1
Embedded Derivative in Modified Coinsurance Arrangement	(33.7)	1.6	(24.4)	(3.7)
Policy Loans Ceded
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying amount of policy loans	$ 2,864.0		$ 2,864.0		$ 2,790.5
Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) | Pricing Service
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Percent of fixed maturity securities valued	15.70%		15.70%
Other Than Fair Value Inputs Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Percent of fixed maturity securities valued	84.30%		84.30%
Significant Other Observable Inputs (Level 2) | Pricing Service
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Percent of fixed maturity securities valued	68.70%		68.70%
Significant Other Observable Inputs (Level 2) | Other Observable Market Data
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Percent of fixed maturity securities valued	4.40%		4.40%
Fair Value Inputs Level 2 Or Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Percent of fixed maturity securities valued	11.20%		11.20%

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Commitments and Contingent Liabilities - Additional Information (Detail)	Sep. 30, 2011	Mar. 31, 2011
Commitments and Contingencies Disclosure [Line Items]
States involved in unclaimed property examination		26
Insurers requested to cross-check benefits	160

XML

Selected Operating Statement Data by Segment (Detail) (USD $) In Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Segment Reporting Information [Line Items]
Premium Income	$ 1,881.2	$ 1,850.2	$ 5,625.7	$ 5,563.2
Net Investment Income	629.2	618.4	1,885.0	1,861.2
Other Income	59.1	58.2	174.8	178.5
Operating Revenue	2,569.5	2,526.8	7,685.5	7,602.9
Operating Income (Loss)	317.2	325.4	973.8	998.6
Unum U.S.
Segment Reporting Information [Line Items]
Premium Income	1,226.5	1,210.6	3,666.5	3,643.2
Net Investment Income	332.4	312.9	983.1	936.2
Other Income	30.4	29.7	91.1	90.6
Operating Revenue	1,589.3	1,553.2	4,740.7	4,670.0
Operating Income (Loss)	219.5	204.7	646.7	619.9
Unum U.K.
Segment Reporting Information [Line Items]
Premium Income	175.5	161.4	518.4	480.1
Net Investment Income	43.3	39.0	139.3	121.9
Other Income	0	0.2	0.1	1.1
Operating Revenue	218.8	200.6	657.8	603.1
Operating Income (Loss)	34.9	47.2	138.3	160.7
Colonial Life
Segment Reporting Information [Line Items]
Premium Income	283.7	269.3	846.1	802.1
Net Investment Income	32.5	31.9	99.6	91.1
Other Income	0.1	0.2	0.4	0.5
Operating Revenue	316.3	301.4	946.1	893.7
Operating Income (Loss)	70.3	74.5	214.5	221.4
Individual Disability-Closed Block
Segment Reporting Information [Line Items]
Premium Income	196.4	208.5	595.0	635.0
Net Investment Income	181.9	185.5	544.2	563.5
Other Income	23.6	22.7	67.9	67.3
Operating Revenue	401.9	416.7	1,207.1	1,265.8
Operating Income (Loss)	14.0	9.8	34.3	33.9
Corporate and Other
Segment Reporting Information [Line Items]
Premium Income	(0.9)	0.4	(0.3)	2.8
Net Investment Income	39.1	49.1	118.8	148.5
Other Income	5.0	5.4	15.3	19.0
Operating Revenue	43.2	54.9	133.8	170.3
Operating Income (Loss)	$ (21.5)	$ (10.8)	$ (60.0)	$ (37.3)

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Basis of Presentation

9 Months Ended

Sep. 30, 2011

Notes to Financial Statements [Abstract]

Basis of Presentation

Basis of Presentation

The accompanying consolidated financial statements of Unum Group and its subsidiaries (the Company) have been prepared in accordance with U.S. generally accepted accounting principles (GAAP) for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by GAAP for complete financial statements. For further information, refer to the consolidated financial statements and footnotes included in our annual report on Form 10-K for the year ended December 31, 2010.

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

In connection with our preparation of the consolidated financial statements, we evaluated events that occurred subsequent to September 30, 2011 for recognition or disclosure in our financial statements and notes to our financial statements.

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Realized Investment Gains and Losses Reported in Consolidated Statements of Income (Detail) (USD $) In Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Available-for-sale Securities [Abstract]
Gross Gains on Sales	$ 14.8	$ 6.0	$ 33.0	$ 35.4
Gross Losses on Sales	(5.4)	(4.1)	(22.1)	(25.8)
Other-Than-Temporary Impairment Loss	(1.2)	0	(4.2)	(10.4)
Other Investments [Abstract]
Gross Gains on Sales	1.6	0.3	7.1	6.9
Gross Losses on Sales	0	0	(0.2)	(0.5)
Impairment Loss	(0.4)	(0.4)	(0.4)	(2.1)
Foreign Currency Transactions	0.4	(2.3)	(1.1)	(2.6)
Embedded Derivative in Modified Coinsurance Arrangement	(33.7)	1.6	(24.4)	(3.7)
Net Realized Investment Gain (Loss)	$ (23.9)	$ 1.1	$ (12.3)	$ (2.8)

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Fair Value Measurements by Input Level (Detail) (USD $) In Millions	Sep. 30, 2011	Dec. 31, 2010
Available for Sale Abstract [Abstract]
Fixed Maturity Securities	$ 42,434.7	$ 40,035.6
Other Long-term Investments
Equity Securities	10.4	10.4
Derivative Assets	143.2	99.1
Other Liabilities
Derivative Liabilities	275.4	295.9
Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1)
Available for Sale Abstract [Abstract]
Fixed Maturity Securities	6,671.2	5,416.2
Other Long-term Investments
Equity Securities	0	0
Derivative Assets	0	0
Other Liabilities
Derivative Liabilities	0	0
Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) | United States Government and Government Agencies and Authorities
Available for Sale Abstract [Abstract]
Fixed Maturity Securities	324.7	102.8
Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) | States, Municipalities, and Political Subdivisions
Available for Sale Abstract [Abstract]
Fixed Maturity Securities	31.5	301.9
Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) | Foreign Governments
Available for Sale Abstract [Abstract]
Fixed Maturity Securities	0	0.7
Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) | Public Utilities
Available for Sale Abstract [Abstract]
Fixed Maturity Securities	1,131.4	840.1
Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) | Mortgage/Asset-backed Securities
Available for Sale Abstract [Abstract]
Fixed Maturity Securities	0	0
Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) | All Other Corporate Bonds
Available for Sale Abstract [Abstract]
Fixed Maturity Securities	5,183.6	4,170.7
Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) | Redeemable Preferred Stocks
Available for Sale Abstract [Abstract]
Fixed Maturity Securities	0	0
Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) | Foreign Exchange Contract [Member]
Other Long-term Investments
Derivative Assets	0	0
Other Liabilities
Derivative Liabilities	0	0
Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) | Interest Rate Swap [Member]
Other Long-term Investments
Derivative Assets	0	0
Other Liabilities
Derivative Liabilities	0	0
Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) | Embedded Derivative Financial Instruments [Member]
Other Liabilities
Derivative Liabilities	0	0
Significant Other Observable Inputs (Level 2)
Available for Sale Abstract [Abstract]
Fixed Maturity Securities	34,859.6	33,593.7
Other Long-term Investments
Equity Securities	0	8.9
Derivative Assets	143.2	99.1
Other Liabilities
Derivative Liabilities	154.7	199.6
Significant Other Observable Inputs (Level 2) | United States Government and Government Agencies and Authorities
Available for Sale Abstract [Abstract]
Fixed Maturity Securities	968.9	998.9
Significant Other Observable Inputs (Level 2) | States, Municipalities, and Political Subdivisions
Available for Sale Abstract [Abstract]
Fixed Maturity Securities	1,554.9	943.3
Significant Other Observable Inputs (Level 2) | Foreign Governments
Available for Sale Abstract [Abstract]
Fixed Maturity Securities	1,474.7	1,408.6
Significant Other Observable Inputs (Level 2) | Public Utilities
Available for Sale Abstract [Abstract]
Fixed Maturity Securities	8,973.5	8,670.5
Significant Other Observable Inputs (Level 2) | Mortgage/Asset-backed Securities
Available for Sale Abstract [Abstract]
Fixed Maturity Securities	3,127.4	3,384.8
Significant Other Observable Inputs (Level 2) | All Other Corporate Bonds
Available for Sale Abstract [Abstract]
Fixed Maturity Securities	18,725.4	18,154.3
Significant Other Observable Inputs (Level 2) | Redeemable Preferred Stocks
Available for Sale Abstract [Abstract]
Fixed Maturity Securities	34.8	33.3
Significant Other Observable Inputs (Level 2) | Foreign Exchange Contract [Member]
Other Long-term Investments
Derivative Assets	2.4	0.7
Other Liabilities
Derivative Liabilities	121.2	160.5
Significant Other Observable Inputs (Level 2) | Interest Rate Swap [Member]
Other Long-term Investments
Derivative Assets	140.8	98.4
Other Liabilities
Derivative Liabilities	33.5	39.1
Significant Other Observable Inputs (Level 2) | Embedded Derivative Financial Instruments [Member]
Other Liabilities
Derivative Liabilities	0	0
Significant Unobservable Inputs (Level 3)
Available for Sale Abstract [Abstract]
Fixed Maturity Securities	903.9	1,025.7
Other Long-term Investments
Equity Securities	10.4	1.5
Derivative Assets	0	0
Other Liabilities
Derivative Liabilities	120.7	96.3
Significant Unobservable Inputs (Level 3) | United States Government and Government Agencies and Authorities
Available for Sale Abstract [Abstract]
Fixed Maturity Securities	0	0
Significant Unobservable Inputs (Level 3) | States, Municipalities, and Political Subdivisions
Available for Sale Abstract [Abstract]
Fixed Maturity Securities	0	0
Significant Unobservable Inputs (Level 3) | Foreign Governments
Available for Sale Abstract [Abstract]
Fixed Maturity Securities	0	0
Significant Unobservable Inputs (Level 3) | Public Utilities
Available for Sale Abstract [Abstract]
Fixed Maturity Securities	395.8	173.6
Significant Unobservable Inputs (Level 3) | Mortgage/Asset-backed Securities
Available for Sale Abstract [Abstract]
Fixed Maturity Securities	19.6	0.7
Significant Unobservable Inputs (Level 3) | All Other Corporate Bonds
Available for Sale Abstract [Abstract]
Fixed Maturity Securities	466.8	829.7
Significant Unobservable Inputs (Level 3) | Redeemable Preferred Stocks
Available for Sale Abstract [Abstract]
Fixed Maturity Securities	21.7	21.7
Significant Unobservable Inputs (Level 3) | Foreign Exchange Contract [Member]
Other Long-term Investments
Derivative Assets	0	0
Other Liabilities
Derivative Liabilities	0	0
Significant Unobservable Inputs (Level 3) | Interest Rate Swap [Member]
Other Long-term Investments
Derivative Assets	0	0
Other Liabilities
Derivative Liabilities	0	0
Significant Unobservable Inputs (Level 3) | Embedded Derivative Financial Instruments [Member]
Other Liabilities
Derivative Liabilities	120.7	96.3
United States Government and Government Agencies and Authorities
Available for Sale Abstract [Abstract]
Fixed Maturity Securities	1,293.6	1,101.7
States, Municipalities, and Political Subdivisions
Available for Sale Abstract [Abstract]
Fixed Maturity Securities	1,586.4	1,245.2
Foreign Governments
Available for Sale Abstract [Abstract]
Fixed Maturity Securities	1,474.7	1,409.3
Public Utilities
Available for Sale Abstract [Abstract]
Fixed Maturity Securities	10,500.7	9,684.2
Mortgage/Asset-backed Securities
Available for Sale Abstract [Abstract]
Fixed Maturity Securities	3,147.0	3,385.5
All Other Corporate Bonds
Available for Sale Abstract [Abstract]
Fixed Maturity Securities	24,375.8	23,154.7
Redeemable Preferred Stocks
Available for Sale Abstract [Abstract]
Fixed Maturity Securities	56.5	55.0
Carrying (Reported) Amount, Fair Value Disclosure [Member]
Available for Sale Abstract [Abstract]
Available-for-sale Securities, Fair Value Disclosure	42,434.7	40,035.6
Other Long-term Investments
Equity Securities	10.4	10.4
Derivative Assets	143.2	99.1
Other Liabilities
Derivative Liabilities	154.7	199.6
Foreign Exchange Contract [Member]
Other Long-term Investments
Derivative Assets	2.4	0.7
Other Liabilities
Derivative Liabilities	121.2	160.5
Interest Rate Swap [Member]
Other Long-term Investments
Derivative Assets	140.8	98.4
Other Liabilities
Derivative Liabilities	33.5	39.1
Embedded Derivative Financial Instruments [Member]
Other Liabilities
Derivative Liabilities	$ 120.7	$ 96.3

XML

Length of Time Fixed Maturity Securities had been in a Gross Unrealized Loss Position (Detail) (USD $) In Millions	Sep. 30, 2011	Dec. 31, 2010
Schedule of Available-for-sale Securities [Line Items]
Less Than 12 Months Fair Value	$ 2,627.7	$ 3,467.6
Less than 12 Months Gross Unrealized Loss	141.7	121.3
12 Months or Greater Fair Value	852.1	1,290.1
12 Months or Greater Gross Unrealized Loss	127.9	116.1
United States Government and Government Agencies and Authorities
Schedule of Available-for-sale Securities [Line Items]
Less Than 12 Months Fair Value	0	23.9
Less than 12 Months Gross Unrealized Loss	0	3.1
12 Months or Greater Fair Value	6.2	10.9
12 Months or Greater Gross Unrealized Loss	1.2	5.5
States, Municipalities, and Political Subdivisions
Schedule of Available-for-sale Securities [Line Items]
Less Than 12 Months Fair Value	4.8	660.6
Less than 12 Months Gross Unrealized Loss	0.1	28.4
12 Months or Greater Fair Value	89.8	100.3
12 Months or Greater Gross Unrealized Loss	3.0	18.9
Public Utilities
Schedule of Available-for-sale Securities [Line Items]
Less Than 12 Months Fair Value	211.8	1,073.8
Less than 12 Months Gross Unrealized Loss	19.7	41.0
12 Months or Greater Fair Value	74.7	41.0
12 Months or Greater Gross Unrealized Loss	8.9	3.3
Mortgage/Asset-backed Securities
Schedule of Available-for-sale Securities [Line Items]
Less Than 12 Months Fair Value	95.5	34.5
Less than 12 Months Gross Unrealized Loss	3.1	0.1
12 Months or Greater Fair Value	20.8	45.5
12 Months or Greater Gross Unrealized Loss	0.8	0.5
All Other Corporate Bonds
Schedule of Available-for-sale Securities [Line Items]
Less Than 12 Months Fair Value	2,315.6	1,667.2
Less than 12 Months Gross Unrealized Loss	118.8	48.3
12 Months or Greater Fair Value	639.5	1,071.7
12 Months or Greater Gross Unrealized Loss	112.3	85.8
Redeemable Preferred Stocks
Schedule of Available-for-sale Securities [Line Items]
Less Than 12 Months Fair Value	0	7.6
Less than 12 Months Gross Unrealized Loss	0	0.4
12 Months or Greater Fair Value	21.1	20.7
12 Months or Greater Gross Unrealized Loss	$ 1.7	$ 2.1

XML

Impaired Mortgage Loans (Detail) (USD $) In Millions	Sep. 30, 2011	Dec. 31, 2010
Recorded Investment	$ 32.7	$ 22.9
Unpaid Principal Balance	34.2	24.4
Related Allowance	1.5	1.5
Impaired Fin Receivables with No Related Allowance [Member]
Recorded Investment	19.6	9.8
Unpaid Principal Balance	19.6	9.8
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

XML

Changes in Assets and Liabilities Measured at Fair Value on a Recurring Basis using Significant Unobservable Inputs (Level 3) (Detail) (USD $) In Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning of Period	$ 788.5	$ 525.3	$ 1,025.7	$ 869.4
Total Realized and Unrealized Investment Gains (Losses) included in Earnings	0.1	0	(2.0)	(2.8)
Total Realized and Unrealized Investment Gains (Losses) included in Other Comprehensive Income or Loss	9.6	18.4	21.4	58.2
Purchases	30.0	20.8	91.1	20.8
Sales	(29.5)	(7.4)	(48.3)	(54.2)
Level 3 Transfers Into	339.8	235.7	395.9	321.1
Level 3 Transfers Out of	(234.6)	(93.3)	(579.9)	(513.0)
End Of Period	903.9	699.5	903.9	699.5
Public Utilities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning of Period	217.9	72.4	173.6	264.3
Total Realized and Unrealized Investment Gains (Losses) included in Earnings	0.1	0	0.1	(1.0)
Total Realized and Unrealized Investment Gains (Losses) included in Other Comprehensive Income or Loss	9.3	6.8	17.1	9.9
Purchases	30.0	0	30.0	0
Sales	(11.9)	(1.3)	(15.7)	(8.1)
Level 3 Transfers Into	220.2	108.0	299.7	112.5
Level 3 Transfers Out of	(69.8)	(28.0)	(109.0)	(219.7)
End Of Period	395.8	157.9	395.8	157.9
US States and Political Subdivisions Debt Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning of Period		0		0
Total Realized and Unrealized Investment Gains (Losses) included in Earnings		0		0
Total Realized and Unrealized Investment Gains (Losses) included in Other Comprehensive Income or Loss		0.5		0.5
Purchases		17.7		17.7
Sales		0		0
Level 3 Transfers Into		0		0
Level 3 Transfers Out of		0		0
End Of Period		18.2		18.2
Mortgage/Asset-backed Securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning of Period	19.7	1.5	0.7	4.7
Total Realized and Unrealized Investment Gains (Losses) included in Earnings	0	0	0	0
Total Realized and Unrealized Investment Gains (Losses) included in Other Comprehensive Income or Loss	(0.1)	0	(0.4)	0.3
Purchases	0	0	19.4	0
Sales	0	(0.8)	(0.1)	(4.3)
Level 3 Transfers Into	0	0	0	0
Level 3 Transfers Out of	0	0	0	0
End Of Period	19.6	0.7	19.6	0.7
All Other Corporate Bonds
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning of Period	528.3	430.1	829.7	580.0
Total Realized and Unrealized Investment Gains (Losses) included in Earnings	0	0	(2.1)	(1.8)
Total Realized and Unrealized Investment Gains (Losses) included in Other Comprehensive Income or Loss	1.3	11.1	4.7	47.5
Purchases	0	3.1	41.7	3.1
Sales	(17.6)	(5.3)	(32.5)	(41.8)
Level 3 Transfers Into	119.6	127.7	96.2	208.6
Level 3 Transfers Out of	(164.8)	(44.1)	(470.9)	(273.0)
End Of Period	466.8	522.6	466.8	522.6
Redeemable Preferred Stocks
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning of Period	22.6	21.3	21.7	20.4
Total Realized and Unrealized Investment Gains (Losses) included in Earnings	0	0	0	0
Total Realized and Unrealized Investment Gains (Losses) included in Other Comprehensive Income or Loss	(0.9)	0	0	0
Purchases	0	0	0	0
Sales	0	0	0	0
Level 3 Transfers Into	0	0	0	0
Level 3 Transfers Out of	0	(21.2)	0	(20.3)
End Of Period	21.7	0.1	21.7	0.1
Equity Securites
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning of Period	3.6	8.9	1.5	1.5
Total Realized and Unrealized Investment Gains (Losses) included in Earnings	(0.4)	0	(0.4)	0
Total Realized and Unrealized Investment Gains (Losses) included in Other Comprehensive Income or Loss	(2.4)	1.8	(1.7)	2.4
Purchases	0	0	2.0	6.9
Sales	0	0	0	(0.1)
Level 3 Transfers Into	9.6	0	9.0	0
Level 3 Transfers Out of	0	0	0	0
End Of Period	10.4	10.7	10.4	10.7
Embedded Derivative in Modified Coinsurance Arrangement
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning of Period	(87.0)	(122.7)	(96.3)	(117.4)
Total Realized and Unrealized Investment Gains (Losses) included in Earnings	(33.7)	1.6	(24.4)	(3.7)
Total Realized and Unrealized Investment Gains (Losses) included in Other Comprehensive Income or Loss	0	0	0	0
Purchases	0	0	0	0
Sales	0	0	0	0
Level 3 Transfers Into	0	0	0	0
Level 3 Transfers Out of	0	0	0	0
End Of Period	$ (120.7)	$ (121.1)	$ (120.7)	$ (121.1)

XML

Commitments and Contingent Liabilities

9 Months Ended

Sep. 30, 2011

Notes to Financial Statements [Abstract]

Commitments and Contingent Liabilities

Commitments and Contingent Liabilities

Contingent Liabilities

We are a defendant in a number of litigation matters. In some of these matters, no specified amount is sought. In others, very large or indeterminate amounts, including punitive and treble damages, are asserted. There is a wide variation of pleading practice permitted in the United States courts with respect to requests for monetary damages, including some courts in which no specified amount is required and others which allow the plaintiff to state only that the amount sought is sufficient to invoke the jurisdiction of that court. Further, some jurisdictions permit plaintiffs to allege damages well in excess of reasonably

possible verdicts. Based on our extensive experience and that of others in the industry with respect to litigating or resolving claims through settlement over an extended period of time, we believe that the monetary damages asserted in a lawsuit or claim bear little relation to the merits of the case, or the likely disposition value. Therefore, the specific monetary relief sought is not stated.

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

Claims Handling Matters

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

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

Broker Compensation, Quoting Process, and Other Matters

Examinations and Investigations

In November 2009, we were contacted by Florida state insurance regulators to discuss a resolution of their investigation of our compliance with state and federal laws with respect to producer compensation, solicitation activities, policies sold to state or municipal entities, and information regarding compensation arrangements with brokers. This investigation commenced in 2005, and, until the November 2009 contact, we had received no communications from the regulators regarding this matter since December 2007. Negotiations are ongoing.  

Broker-Related Litigation

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

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

Miscellaneous Matters

In September 2008, we received service of a complaint, in an adversary proceeding in connection with the bankruptcy case In

re Quebecor World (USA) Inc., et al. entitled Official Committee of Unsecured Creditors of Quebecor World (USA) Inc., et al., v. American United Life Insurance Company, et al., filed in the United States Bankruptcy Court for the Southern District of New York.  The complaint alleges that we received preference payments relating to notes held by certain of our insurance subsidiaries and seeks to avoid and recover such payments plus interest and cost of the action.  On July 27, 2011, the Bankruptcy Court ruled in our favor, granting a summary judgment motion to dismiss the case against us and the other defendants. This decision has been appealed to the United States District Court for the Southern District of New York.

In July 2010, we received a subpoena from the Office of the New York Attorney General requesting documents and information relating to certain group life insurance policies wherein we paid life insurance proceeds by establishing interest-bearing retained asset accounts. We furnished the requested documents and information. Our last submission was made on October 6, 2010. Because we have received no further communications from the New York Attorney General following our response, we consider this investigation to be dormant.

In October 2010, Denise Merrimon, Bobby S. Mowery, and all others similarly situated vs. Unum Life Insurance Company of America, was filed in the United States District Court for the District of Maine. This is a putative class action alleging that we breached fiduciary duties owed to certain beneficiaries under certain group life insurance policies when we paid life insurance proceeds by establishing interest-bearing retained asset accounts rather than by mailing checks. Plaintiffs seek to represent a class of beneficiaries under group life insurance contracts that were employee welfare benefit plans under ERISA and under which we paid death benefits pursuant to a retained asset account. Plaintiffs seek to recover on behalf of the class the difference between the interest paid to them and amounts alleged to have been realized by us through our investment of the retained assets. We intend to vigorously defend the action.

In March 2011, we received a request for information from an independent third party as part of an examination on behalf of 26 states and the District of Columbia to evaluate our compliance with the unclaimed property laws of the participating states. Industry-wide practices are currently under review concerning the identification and handling of unclaimed property by insurers, and numerous other insurers are under similar examination. We are cooperating fully with this examination. In July 2011, the New York State Insurance Department issued a special request to approximately 160 insurers, including Unum Group's New York licensed insurance subsidiaries, which requires the insurers to cross-check their life insurance policies, annuity contracts, and retained asset accounts with the latest version of the Social Security Master Death Index to identify any matches. Insurers are also requested to investigate the matches to determine if death benefits are due, to locate the beneficiaries, and to make payments where appropriate. We are cooperating fully with this request. It is possible other state jurisdictions may pursue similar investigations or inquiries or issue directives similar to the New York Insurance Department's letter. It is possible that the audits and related activity may result in additional payments to beneficiaries, the payment of abandoned funds under state law, and/or administrative penalties. We are currently unable to estimate the reasonably possible amount of any additional payments.

Summary

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

Given the complexity and scope of our litigation and regulatory matters, it is not possible to predict the ultimate outcome of all pending investigations or legal proceedings or provide reasonable estimates of potential losses, except where 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.

XML

Net Income Per Common Share (Detail) (USD $) In Millions, except Share data	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Numerator
Net Income	$ 205.6	$ 220.8	$ 660.8	$ 660.3
Denominator (000s)
Weighted Average Common Shares - Basic	298,185,800	323,083,500	305,694,500	328,828,600
Dilution for Assumed Exercises of Stock Options and Nonvested Stock Awards	987,100	1,383,500	1,223,900	1,344,500
Weighted Average Common Shares - Assuming Dilution	299,172,900	324,467,000	306,918,400	330,173,100
Net Income Per Common Share
Basic	$ 0.69	$ 0.68	$ 2.16	$ 2.01
Assuming Dilution	$ 0.69	$ 0.68	$ 2.15	$ 2.00
Retained Earnings [Member]
Numerator
Net Income			$ 660.8

XML

Accounting Developments

9 Months Ended

Sep. 30, 2011

Notes to Financial Statements [Abstract]

Accounting Developments

Accounting Developments

Accounting Updates Adopted during the First Nine Months of 2011:

Accounting Standards Codification (ASC) 310 “Receivables”

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

Accounting Updates Adopted during the First Nine Months of 2010:

ASC 810 “Consolidation”

In June 2009, the FASB issued an update to require a qualitative rather than a quantitative analysis to determine the primary beneficiary of a variable interest entity and require enhanced disclosures about an enterprise's involvement with a variable interest entity. We adopted this update effective January 1, 2010. The adoption of this update had no effect on our financial position or results of operations. 

ASC 820 “Fair Value Measurements and Disclosures”

In January 2010, the FASB issued an update to require a number of additional disclosures regarding fair value measurements. Specifically, the update requires a reporting entity to disclose the amounts of significant transfers between Level 1 and Level 2 of the three tier fair value hierarchy and the reasons for these transfers, as well as the reasons for any transfers in or out of Level 3, effective for annual and interim periods beginning after December 15, 2009. The update also requires information in the reconciliation of recurring Level 3 measurements about purchases, sales, issuances, and settlements on a gross basis, effective for annual and interim periods beginning after December 15, 2010. We adopted this update in its entirety, including early adoption of the additional Level 3 information, effective January 1, 2010. 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 June 2009, the FASB issued an update to eliminate the exceptions for qualifying special-purpose entities from the consolidation guidance and eliminate the exception that permitted sale accounting for certain mortgage securitizations when a transferor has not surrendered control over the transferred financial assets. In addition, this update clarifies certain requirements for financial assets that are eligible for sale accounting and requires enhanced disclosures about the risks that a transferor continues to be exposed to because of its continuing involvement in transferred financial assets. We adopted this update effective January 1, 2010. The adoption of this update had no effect on our financial position or results of operations.

Accounting Updates Outstanding:

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 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. The amendments in this update shall be applied retrospectively and are effective for interim and annual periods beginning after December 15, 2011. In October 2011, the FASB tentatively decided to issue an exposure draft to delay the effective date of the presentation requirements for reclassification adjustments to give the FASB time to address concerns expressed by registrants about applying the presentation requirements contained within the update. The adoption of this update will modify our financial statement presentation but will have 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 would not be 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. The amendments in this update are effective for goodwill impairment tests performed for interim and annual periods beginning after December 15, 2011. The adoption of this update will have 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. The amendments in this update are effective for interim and annual periods beginning after December 15, 2011. The adoption of this update will expand our disclosures but will have 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. This update will be effective for interim and annual reporting periods beginning on or after December 15, 2011 and early adoption is prohibited. The adoption of this update will have no effect on our financial position or results of operations.

ASC 944 “Financial Services - Insurance”

In October 2010, the FASB issued an update which is intended 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 modify the existing guidance and 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.

The amendments in the update are effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2011 and permit retrospective application.

Our expected retrospective adoption of this update will result in a reduction in our deferred acquisition cost asset as well as a decrease in the amortization associated with those previously deferred costs. There will also be a reduction in the level of costs we defer subsequent to adoption. 

We are evaluating the full effects of implementing this update, but we currently estimate that our retrospective adoption will result in a cumulative effect adjustment to the opening balance of retained earnings of between $400.0 million and $600.0 million in the year of adoption.  We currently estimate the adoption of this update will result in an immaterial decrease in net income in 2012 and in the years preceding to which the retrospective adoption will be applied.

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Investments (Tables)

9 Months Ended

Sep. 30, 2011

Notes to Financial Statements [Abstract]

Schedule of Available-for-sale Securities Reconciliation

At September 30, 2011 and December 31, 2010, all fixed maturity securities were classified as available-for-sale. The amortized cost and fair values of securities by security type are shown as follows.

	September 30, 2011
	(in millions of dollars)
	Amortized Cost		Gross Unrealized Gain		Gross Unrealized Loss		Fair Value
United States Government and Government Agencies and Authorities	$	998.8	$	296.0	$	1.2	$	1,293.6
States, Municipalities, and Political Subdivisions	1,360.5		229.0		3.1		1,586.4
Foreign Governments	1,254.3		220.4		—		1,474.7
Public Utilities	8,935.8		1,593.5		28.6		10,500.7
Mortgage/Asset-Backed Securities	2,764.4		386.5		3.9		3,147.0
All Other Corporate Bonds	21,377.1		3,229.8		231.1		24,375.8
Redeemable Preferred Stocks	55.8		2.4		1.7		56.5
Total Fixed Maturity Securities	$	36,746.7	$	5,957.6	$	269.6	$	42,434.7

There were no other-than-temporary impairments recognized in accumulated other comprehensive income as of September 30, 2011.

	December 31, 2010
	(in millions of dollars)
	Amortized Cost		Gross Unrealized Gain		Gross Unrealized Loss		Fair Value		Other-Than- Temporary Impairments in AOCI (1)
United States Government and Government Agencies and Authorities	$	981.7	$	128.6	$	8.6	$	1,101.7	$	—
States, Municipalities, and Political Subdivisions	1,271.0		21.5		47.3		1,245.2		—
Foreign Governments	1,248.6		160.7		—		1,409.3		—
Public Utilities	8,874.2		854.3		44.3		9,684.2		—
Mortgage/Asset-Backed Securities	3,047.8		338.3		0.6		3,385.5		—
All Other Corporate Bonds	21,067.5		2,221.3		134.1		23,154.7		3.9
Redeemable Preferred Stocks	55.8		1.7		2.5		55.0		—
Total Fixed Maturity Securities	$	36,546.6	$	3,726.4	$	237.4	$	40,035.6	$	3.9

(1) Accumulated Other Comprehensive Income (Loss)

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

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

	September 30, 2011
	(in millions of dollars)
	Less Than 12 Months				12 Months or Greater
	Fair Value		Gross Unrealized Loss		Fair Value		Gross Unrealized Loss
United States Government and Government Agencies and Authorities	$	—	$	—	$	6.2	$	1.2
States, Municipalities, and Political Subdivisions	4.8		0.1		89.8		3.0
Public Utilities	211.8		19.7		74.7		8.9
Mortgage/Asset-Backed Securities	95.5		3.1		20.8		0.8
All Other Corporate Bonds	2,315.6		118.8		639.5		112.3
Redeemable Preferred Stocks	—		—		21.1		1.7
Total Fixed Maturity Securities	$	2,627.7	$	141.7	$	852.1	$	127.9

	December 31, 2010
	(in millions of dollars)
	Less Than 12 Months				12 Months or Greater
	Fair Value		Gross Unrealized Loss		Fair Value		Gross Unrealized Loss
United States Government and Government Agencies and Authorities	$	23.9	$	3.1	$	10.9	$	5.5
States, Municipalities, and Political Subdivisions	660.6		28.4		100.3		18.9
Public Utilities	1,073.8		41.0		41.0		3.3
Mortgage/Asset-Backed Securities	34.5		0.1		45.5		0.5
All Other Corporate Bonds	1,667.2		48.3		1,071.7		85.8
Redeemable Preferred Stocks	7.6		0.4		20.7		2.1
Total Fixed Maturity Securities	$	3,467.6	$	121.3	$	1,290.1	$	116.1

Distribution of the Maturity Dates for Fixed Maturity Securities

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

	September 30, 2011
	(in millions of dollars)
	Total Amortized Cost		Unrealized Gain Position				Unrealized Loss Position
			Gross Gain		Fair Value		Gross Loss		Fair Value
1 year or less	$	669.6	$	13.4	$	636.9	$	0.2	$	45.9
Over 1 year through 5 years	5,061.2		442.7		4,956.9		15.7		531.3
Over 5 years through 10 years	9,563.7		1,191.2		9,257.3		98.5		1,399.1
Over 10 years	18,687.8		3,923.8		21,073.1		151.3		1,387.2
	33,982.3		5,571.1		35,924.2		265.7		3,363.5
Mortgage/Asset-Backed Securities	2,764.4		386.5		3,030.7		3.9		116.3
Total Fixed Maturity Securities	$	36,746.7	$	5,957.6	$	38,954.9	$	269.6	$	3,479.8

	December 31, 2010
	(in millions of dollars)
	Total Amortized Cost		Unrealized Gain Position				Unrealized Loss Position
			Gross Gain		Fair Value		Gross Loss		Fair Value
1 year or less	$	685.7	$	10.9	$	532.6	$	0.4	$	163.6
Over 1 year through 5 years	4,740.6		394.1		4,886.3		5.5		242.9
Over 5 years through 10 years	9,501.6		931.6		9,415.0		37.1		981.1
Over 10 years	18,570.9		2,051.5		17,138.5		193.8		3,290.1
	33,498.8		3,388.1		31,972.4		236.8		4,677.7
Mortgage/Asset-Backed Securities	3,047.8		338.3		3,305.5		0.6		80.0
Total Fixed Maturity Securities	$	36,546.6	$	3,726.4	$	35,277.9	$	237.4	$	4,757.7

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

The following table presents the before-tax credit related portion of other-than-temporary impairments on fixed maturity securities still held as of the dates shown for which a portion of the other-than-temporary impairment was recognized in other comprehensive income.

	Nine Months Ended			Three and Nine Months Ended
	September 30, 2011			September 30, 2010
	(in millions of dollars)
Balance at Beginning of Period	$	8.5		$	18.3
Sales or Maturities of Securities	(8.5		)	—
Balance at End of Period	$	—		$	18.3

There was no activity for the three months ended September 30, 2011 or for the three and nine months ended September 30, 2010.

Mortgage Loans by Property Type

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

	September 30, 2011				December 31, 2010
	Carrying		Percent of		Carrying		Percent of
	Amount		Total		Amount		Total
	(in millions of dollars)
Property Type
Apartment	$	28.1	1.7	%	$	33.7	2.2	%
Industrial	518.2		32.3		458.2		30.2
Mixed	94.1		5.9		95.8		6.3
Office	658.1		41.0		634.7		41.9
Retail	301.2		18.7		286.9		18.9
Other	7.2		0.4		7.5		0.5
Total	$	1,606.9	100.0	%	$	1,516.8	100.0	%

Mortgage Loans by Geographic Region

Region
New England	$	148.2	9.2	%	$	146.8	9.7	%
Mid-Atlantic	172.3		10.7		184.8		12.2
East North Central	214.0		13.3		171.7		11.3
West North Central	152.4		9.5		134.6		8.9
South Atlantic	390.5		24.3		372.0		24.5
East South Central	52.7		3.3		26.9		1.8
West South Central	161.9		10.1		171.8		11.3
Mountain	59.2		3.7		60.7		4.0
Pacific	255.7		15.9		247.5		16.3
Total	$	1,606.9	100.0	%	$	1,516.8	100.0	%

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

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

	September 30 2011		December 31 2010
	(in millions of dollars)
Internal Rating
Aa	$	18.0	$	19.0
A	702.6		744.4
Baa	842.2		732.9
Ba	31.0		20.5
B	13.1		—
Total	$	1,606.9	$	1,516.8

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

Loan-to-Value Ratio
<= 65%	$	558.0	$	425.3
> 65% <= 75%	806.4		869.2
> 75% <= 85%	169.7		161.9
> 85% <= 100%	72.8		60.4
Total	$	1,606.9	$	1,516.8

Activity in the Allowance for Credit Losses

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

	Three and Nine Months Ended September 30 2011		Three Months Ended September 30 2010		Nine Months Ended September 30 2010
	(in millions of dollars)
Balance at Beginning of Period	$	1.5	$	0.5	$	3.2
Provision	—		0.4		0.9
Charge-offs, Net of Recoveries	—		—		(3.2		)
Balance at End of Period	$	1.5	$	0.9	$	0.9

Impaired Mortgage Loans

Impaired mortgage loans are as follows:

	September 30, 2011
	(in millions of dollars)
			Unpaid
	Recorded		Principal		Related
	Investment		Balance		Allowance
With No Related Allowance Recorded	$	19.6	$	19.6	$	—
With an Allowance Recorded	13.1		14.6		1.5
Total	$	32.7	$	34.2	$	1.5
	December 31, 2010
	(in millions of dollars)
			Unpaid
	Recorded		Principal		Related
	Investment		Balance		Allowance
With No Related Allowance Recorded	$	9.8	$	9.8	$	—
With an Allowance Recorded	13.1		14.6		1.5
Total	$	22.9	$	24.4	$	1.5

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 September 30						Nine Months Ended September 30
	2011			2010			2011			2010
	(in millions of dollars)
Fixed Maturity Securities
Gross Gains on Sales	$	14.8		$	6.0		$	33.0		$	35.4
Gross Losses on Sales	(5.4		)	(4.1		)	(22.1		)	(25.8		)
Other-Than-Temporary Impairment Loss	(1.2		)	—			(4.2		)	(10.4		)
Mortgage Loans and Other Invested Assets
Gross Gains on Sales	1.6			0.3			7.1			6.9
Gross Losses on Sales	—			—			(0.2		)	(0.5		)
Impairment Loss	(0.4		)	(0.4		)	(0.4		)	(2.1		)
Foreign Currency Transactions	0.4			(2.3		)	(1.1		)	(2.6		)
Embedded Derivative in Modified Coinsurance Arrangement	(33.7		)	1.6			(24.4		)	(3.7		)
Net Realized Investment Gain (Loss)	$	(23.9	)	$	1.1		$	(12.3	)	$	(2.8	)

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Mortgage Loans, Sorted by Applicable Credit Quality Indicators, Loan to Value Ratio (Detail) (USD $) In Millions	Sep. 30, 2011	Dec. 31, 2010
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans	$ 1,606.9	$ 1,516.8
Loan to Value Ratio Below or Equal to 65 Percent
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans	558.0	425.3
Loan To Value Ratio Above 65 To 75 Percent
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans	806.4	869.2
Loan To Value Ratio Above 75 To 85 Percent
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans	169.7	161.9
Loan To Value Ratio Above 85 Percent
Mortgage Loans on Real Estate [Line Items]
Mortgage Loans	$ 72.8	$ 60.4

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Transfers of Assets between Level 1 and Level 2 (Detail) (USD $) In Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Available for Sale Abstract [Abstract]
Level 1 from Level 2	$ 2,641.0	$ 3,148.4	$ 3,239.8	$ 3,731.6
Level 2 from Level 1	3,078.1	2,527.5	2,523.5	1,698.4
United States Government and Government Agencies and Authorities
Available for Sale Abstract [Abstract]
Level 1 from Level 2	177.2	17.1	169.8	110.8
Level 2 from Level 1	16.1	20.5	0	0
States, Municipalities, and Political Subdivisions
Available for Sale Abstract [Abstract]
Level 1 from Level 2	0	123.7	25.4	55.4
Level 2 from Level 1	20.0	40.0	301.9	59.5
Foreign Governments
Available for Sale Abstract [Abstract]
Level 1 from Level 2	0		0
Level 2 from Level 1	0		0.7
Public Utilities
Available for Sale Abstract [Abstract]
Level 1 from Level 2	665.7	678.9	710.5	616.1
Level 2 from Level 1	694.8	579.4	488.6	581.0
All Other Corporate Bonds
Available for Sale Abstract [Abstract]
Level 1 from Level 2	1,798.1	2,328.7	2,334.1	2,949.3
Level 2 from Level 1	2,347.2	1,887.6	1,732.3	1,052.4
Redeemable Preferred Stocks [Member]
Available for Sale Abstract [Abstract]
Level 1 from Level 2		0		0
Level 2 from Level 1		$ 0		$ 5.5

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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (USD $) In Millions	Total	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Income	Retained Earnings	Treasury Stock
Balance at Beginning of Year at Dec. 31, 2009		$ 36.4	$ 2,587.4	$ 341.0	$ 6,289.5	$ (754.2)
Common Stock Activity		0.1	23.7
Change During Period	152.8			152.8
Net Income	660.3
Dividends to Stockholders (per common share: $0.2900; $0.2575)					(85.4)
Purchases of Treasury Stock	(327.5)					(327.5)
Retirement of Repurchased Common Shares		0	0		0
Balance at End of Period at Sep. 30, 2010	8,924.1	36.5	2,611.1	493.8	6,864.4	(1,081.7)
Balance at Beginning of Year at Dec. 31, 2010	8,944.4	36.5	2,615.4	341.9	7,060.8	(1,110.2)
Common Stock Activity		0.1	20.7
Change During Period	544.3			544.3
Net Income	660.8				660.8
Dividends to Stockholders (per common share: $0.2900; $0.2575)					(90.3)
Purchases of Treasury Stock						(419.9)
Retirement of Repurchased Common Shares		(0.8)	(55.2)		(144.0)
Balance at End of Period at Sep. 30, 2011	$ 9,460.1	$ 35.8	$ 2,580.9	$ 886.2	$ 7,487.3	$ (1,530.1)

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Derivative Financial Instruments (Tables)

9 Months Ended

Sep. 30, 2011

Notes to Financial Statements [Abstract]

Notional Amounts for Each Category of Derivative Activity

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

	Swaps
	Receive Variable/Pay Fixed		Receive Fixed/Pay Fixed		Receive Fixed/Pay Variable		Forwards		Total
			(in millions of dollars)
Balance at June 30, 2011	$	174.0	$	579.7	$	785.0	$	—	$	1,538.7
Additions	—		—		—		15.0		15.0
Terminations	—		5.0		50.0		—		55.0
Balance at September 30, 2011	$	174.0	$	574.7	$	735.0	$	15.0	$	1,498.7
Balance at December 31, 2010	$	174.0	$	617.9	$	890.0	$	—	$	1,681.9
Additions	—		—		—		46.9		46.9
Terminations	—		43.2		155.0		31.9		230.1
Balance at September 30, 2011	$	174.0	$	574.7	$	735.0	$	15.0	$	1,498.7

Timing of Anticipated Settlements of Interest Rate Swaps Outstanding

The following table summarizes the timing of anticipated settlements of interest rate swaps outstanding under our cash flow hedging programs at September 30, 2011, whereby we receive a fixed rate and pay a variable rate. The weighted average variable interest rates assume current market conditions.

	2011			2012			2013			Total
				(in millions of dollars)
Notional Value	$	50.0		$	185.0		$	150.0		$	385.0
Weighted Average Receive Rate	5.16		%	6.49		%	6.34		%	6.26		%
Weighted Average Pay Rate	0.37		%	0.37		%	0.37		%	0.37		%

Location and Fair Values of Derivative Financial Instruments

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

	September 30, 2011
	(in millions of dollars)
	Asset Derivatives			Liability Derivatives
	Balance Sheet Location	Fair Value		Balance Sheet Location	Fair Value
Designated as Hedging Instruments
Interest Rate Swaps and Forwards	Other L-T Investments	$	140.8	Other Liabilities	$	33.5
Foreign Exchange Contracts	Other L-T Investments	2.4		Other Liabilities	121.2
Total		$	143.2		$	154.7
Not Designated as Hedging Instruments
Embedded Derivative in Modified Coinsurance Arrangement				Other Liabilities	$	120.7

	December 31, 2010
	(in millions of dollars)
	Asset Derivatives			Liability Derivatives
	Balance Sheet Location	Fair Value		Balance Sheet Location	Fair Value
Designated as Hedging Instruments
Interest Rate Swaps	Other L-T Investments	$	98.4	Other Liabilities	$	39.1
Foreign Exchange Contracts	Other L-T Investments	0.7		Other Liabilities	160.5
Total		$	99.1		$	199.6
Not Designated as Hedging Instruments
Embedded Derivative in Modified Coinsurance Arrangement				Other Liabilities	$	96.3

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

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

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

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

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

(3) Loss recognized in interest and debt expense

	Three Months Ended September 30, 2010
	Loss Recognized in OCI on Derivatives (Effective Portion)			Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)				Gain (Loss) Recognized in Income on Derivatives (Ineffective Portion)
	(in millions of dollars)
Interest Rate Swaps and Forwards	$	(7.7	)	$	6.9		(1)	$	—
Interest Rate Swaps	—			1.6			(2)	—
Interest Rate Swaps	—			(0.1		)	(3)	—
Foreign Exchange Contracts	—			(0.4		)	(1)	—
Foreign Exchange Contracts	(34.5		)	(21.2		)	(2)	—
Foreign Exchange Contracts	—			0.7			(3)	—
Total	$	(42.2	)	$	(12.5	)		$	—

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

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

(3) Gain (loss) recognized in interest and debt expense

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

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

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

(3) Loss recognized in interest and debt expense

	Nine Months Ended September 30, 2010
	Gain (Loss) Recognized in OCI on Derivatives (Effective Portion)			Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)				Gain (Loss) Recognized in Income on Derivatives (Ineffective Portion)
	(in millions of dollars)
Interest Rate Swaps and Forwards	$	16.8		$	22.5		(1)	$	—
Interest Rate Swaps	—			4.2			(2)	—
Interest Rate Swaps	—			(0.1		)	(3)	—
Interest Rate Swaps	—			(0.1		)	(4)	—
Foreign Exchange Contracts	—			(1.5		)	(1)	—
Foreign Exchange Contracts	(3.9		)	(7.7		)	(2)	—
Foreign Exchange Contracts	—			1.9			(3)	—
Total	$	12.9		$	19.2			$	—

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

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

(3) Gain (loss) recognized in interest and debt expense

(4) Loss recognized in other income

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

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

	Three Months Ended September 30					Nine Months Ended September 30
	2011			2010		2011			2010
	(in millions of dollars)
Gain (Loss) Recognized in Net Realized Investment Gain (Loss)	$	(33.7	)	$	1.6	$	(24.4	)	$	(3.7	)

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Notional Amounts for Each Category of Derivative Activity (Detail) (USD $) In Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2011	Sep. 30, 2011
Derivative [Line Items]
Balance at beginning of period	$ 1,538.7	$ 1,681.9
Additions	15.0	46.9
Terminations	55.0	230.1
Balance at ending of period	1,498.7	1,498.7
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	579.7	617.9
Additions	0	0
Terminations	5.0	43.2
Balance at ending of period	574.7	574.7
Swaps | Receive Fixed/Pay Variable
Derivative [Line Items]
Balance at beginning of period	785.0	890.0
Additions	0	0
Terminations	50.0	155.0
Balance at ending of period	735.0	735.0
Forwards
Derivative [Line Items]
Balance at beginning of period	0	0
Additions	15.0	46.9
Terminations	0	31.9
Balance at ending of period	15.0	15.0
Receive Fixed/Pay Variable
Derivative [Line Items]
Balance at ending of period	$ 385.0	$ 385.0

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Pensions and Other Postretirement Benefits (Tables)

9 Months Ended

Sep. 30, 2011

Notes to Financial Statements [Abstract]

Components of Net Periodic Benefit Cost

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

	Three Months Ended September 30
	2011			2010			2011			2010			2011			2010
	Pension Benefits
	U.S. Plans						Non U.S. Plans						OPEB
	(in millions of dollars)
Service Cost	$	10.7		$	9.2		$	1.1		$	0.9		$	0.5		$	0.6
Interest Cost	19.4			17.8			2.3			2.4			2.5			2.7
Expected Return on Plan Assets	(21.9		)	(17.7		)	(3.1		)	(2.7		)	(0.2		)	(0.2		)
Amortization of:
Net Actuarial Loss	8.0			7.4			—			0.6			—			—
Prior Service Credit	(0.1		)	(0.1		)	—			—			(0.6		)	(0.6		)
Net Periodic Benefit Cost	$	16.1		$	16.6		$	0.3		$	1.2		$	2.2		$	2.5
	Nine Months Ended September 30
	2011			2010			2011			2010			2011			2010
	Pension Benefits
	U.S. Plans						Non U.S. Plans						OPEB
	(in millions of dollars)
Service Cost	$	32.0		$	27.4		$	3.5		$	3.4		$	1.4		$	1.9
Interest Cost	58.2			53.4			6.7			7.1			7.5			8.1
Expected Return on Plan Assets	(65.7		)	(52.9		)	(9.2		)	(7.9		)	(0.5		)	(0.5		)
Amortization of:
Net Actuarial Loss	24.0			22.3			—			1.8			—			—
Prior Service Credit	(0.4		)	(0.4		)	—			—			(1.9		)	(1.9		)
Net Periodic Benefit Cost	$	48.1		$	49.8		$	1.0		$	4.4		$	6.5		$	7.6

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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Millions	9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010
Cash Flows from Operating Activities
Net Income	$ 660.8	$ 660.3
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities
Change in Receivables	(45.8)	(44.1)
Change in Deferred Acquisition Costs	(71.7)	(47.8)
Change in Insurance Reserves and Liabilities	321.7	440.4
Change in Income Taxes	41.2	124.5
Change in Other Accrued Liabilities	12.4	(35.9)
Non-cash Adjustments to Net Investment Income	(206.6)	(225.6)
Net Realized Investment Loss	12.3	2.8
Depreciation	60.2	56.1
Other, Net	4.2	(16.9)
Net Cash Provided by Operating Activities	788.7	913.8
Cash Flows from Investing Activities
Proceeds from Sales of Available-for-Sale Securities	908.8	723.9
Proceeds from Maturities of Available-for-Sale Securities	1,235.0	1,682.4
Proceeds from Sales and Maturities of Other Investments	101.3	102.3
Purchase of Available-for-Sale Securities	(2,162.2)	(2,958.7)
Purchase of Other Investments	(234.3)	(222.1)
Net Sales (Purchases) of Short-term Investments	86.3	(70.3)
Other, Net	(75.9)	(100.4)
Net Cash Used by Investing Activities	(141.0)	(842.9)
Cash Flows from Financing Activities
Net Short-term Debt Repayments	117.3	0
Issuance of Long-term Debt	0	396.9
Long-term Debt Repayments	(66.9)	(62.7)
Issuance of Common Stock	7.6	9.4
Repurchase of Common Stock	(619.9)	(324.0)
Dividends Paid to Stockholders	(90.3)	(85.4)
Other, Net	3.2	1.9
Net Cash Used by Financing Activities	(649.0)	(63.9)
Effect of Foreign Exchange Rate Changes on Cash	(0.1)	0
Net Increase (Decrease) in Cash and Bank Deposits	(1.4)	7.0
Cash and Bank Deposits at Beginning of Year	53.6	71.6
Cash and Bank Deposits at End of Period	$ 52.2	$ 78.6

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Pensions and Other Postretirement Benefits

9 Months Ended

Sep. 30, 2011

Notes to Financial Statements [Abstract]

Pensions and Other Postretirement Benefits

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

	Three Months Ended September 30
	2011			2010			2011			2010			2011			2010
	Pension Benefits
	U.S. Plans						Non U.S. Plans						OPEB
	(in millions of dollars)
Service Cost	$	10.7		$	9.2		$	1.1		$	0.9		$	0.5		$	0.6
Interest Cost	19.4			17.8			2.3			2.4			2.5			2.7
Expected Return on Plan Assets	(21.9		)	(17.7		)	(3.1		)	(2.7		)	(0.2		)	(0.2		)
Amortization of:
Net Actuarial Loss	8.0			7.4			—			0.6			—			—
Prior Service Credit	(0.1		)	(0.1		)	—			—			(0.6		)	(0.6		)
Net Periodic Benefit Cost	$	16.1		$	16.6		$	0.3		$	1.2		$	2.2		$	2.5
	Nine Months Ended September 30
	2011			2010			2011			2010			2011			2010
	Pension Benefits
	U.S. Plans						Non U.S. Plans						OPEB
	(in millions of dollars)
Service Cost	$	32.0		$	27.4		$	3.5		$	3.4		$	1.4		$	1.9
Interest Cost	58.2			53.4			6.7			7.1			7.5			8.1
Expected Return on Plan Assets	(65.7		)	(52.9		)	(9.2		)	(7.9		)	(0.5		)	(0.5		)
Amortization of:
Net Actuarial Loss	24.0			22.3			—			1.8			—			—
Prior Service Credit	(0.4		)	(0.4		)	—			—			(1.9		)	(1.9		)
Net Periodic Benefit Cost	$	48.1		$	49.8		$	1.0		$	4.4		$	6.5		$	7.6

We have no regulatory contribution requirements for our U.S. qualified defined benefit plan in 2011. For our U.K. operation, which maintains a separate defined benefit plan, we made required contributions totaling $1.2 million and $3.6 million in the third quarter and first nine months of 2011, respectively, or approximately £0.7 million and £2.2 million.

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Pensions and Other Postretirement Benefits - Additional Information (Detail) In Millions	9 Months Ended	3 Months Ended	9 Months Ended	3 Months Ended	9 Months Ended
	Sep. 30, 2011 United States Pension Plans of US Entity, Defined Benefit [Member] USD ($)	Sep. 30, 2011 Pension Benefits UK Plans [Member] USD ($)	Sep. 30, 2011 Pension Benefits UK Plans [Member] USD ($)	Sep. 30, 2011 United Kingdom, Pounds GBP (£)	Sep. 30, 2011 United Kingdom, Pounds GBP (£)
Pension and Other Postretirement Benefits Disclosure [Line Items]
Contributions to defined benefit plan	$ 0	$ 1.2	$ 3.6	£ 0.7	£ 2.2

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Other - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended			9 Months Ended			3 Months Ended	9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Mar. 31, 2010	Sep. 30, 2011	Sep. 30, 2010	Mar. 31, 2011	Mar. 31, 2011 7.625% senior notes due March 2011	Sep. 30, 2011 Northwind Holdings LLC	Sep. 30, 2011 Tailwind Holdings LLC	Sep. 30, 2011 Minimum	Sep. 30, 2011 Maximum
Income Taxes [Line Items]
Principal payments on senior secured non-recourse variable rate notes								$ 59.4	$ 7.5
Debt maturing in 2011							225.1
Cash Collateral for Borrowed Securities	342.4			342.4
Liability for unrecognized tax benefits	133.5			133.5
Liability for unrecognized tax benefits, associated with deferred tax assets	118.3			118.3
Total unrecognized tax benefit that would impact, if recognized, the effective tax rate	15.2			15.2
Interest expense and penalties related to unrecognized tax expense	1.5	1.5		4.1	4.0
Decrease in liability for unrecognized tax benefits										0	55.0
2011 Original UK Tax rate						28.00%
Ultimate UK Tax rate	23.00%			23.00%
2011 Previous UK Tax rate						27.00%
2011 New UK Tax rate	26.00%			26.00%
2012 UK tax rate	25.00%			25.00%
Income Tax Reconciliation, Change in Enacted Tax Rate				6.8	2.7
Income tax expense, non-cash tax charge			$ 10.2

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Distribution of the Maturity Dates for Fixed Maturity Securities (Detail) (USD $) In Millions	Sep. 30, 2011	Dec. 31, 2010
Available-for-Sale Securities, Total Amortized Cost
1 year or less	$ 669.6	$ 685.7
Over 1 year through 5 years	5,061.2	4,740.6
Over 5 years through 10 years	9,563.7	9,501.6
Over 10 years	18,687.8	18,570.9
Available-for-sale Securities, Debt Maturities, Gross Subtotal	33,982.3	33,498.8
Mortgage/Asset-Backed Securities	2,764.4	3,047.8
Total Fixed Maturity Securities	36,746.7	36,546.6
Available-for-Sale Securities, Unrealized Gain Position, Gross Gain
1 year or less	13.4	10.9
Over 1 year through 5 years	442.7	394.1
Over 5 years through 10 years	1,191.2	931.6
Over 10 years	3,923.8	2,051.5
Available-For-Sale Securities, Debt Maturities Unrealized Gain Position, Gross Gain, Gross Subtotal, Total	5,571.1	3,388.1
Mortgage/Asset-Backed Securities	386.5	338.3
Total Fixed Maturity Securities	5,957.6	3,726.4
Available-for-Sale Securities, Unrealized Loss Position, Gross Loss
1 year or less	0.2	0.4
Over 1 year through 5 years	15.7	5.5
Over 5 years through 10 years	98.5	37.1
Over 10 years	151.3	193.8
Available-For-Sale Securities, Debt Maturities Unrealized Gain Position, Gross Loss, Gross Subtotal, Total	265.7	236.8
Mortgage/Asset-Backed Securities	3.9	0.6
Total Fixed Maturity Securities	269.6	237.4
Available-for-Sale Securities, Unrealized Gain Position, Fair Value
Fair Value Maturity Distribution [Abstract]
1 year or less	636.9	532.6
Over 1 year through 5 years	4,956.9	4,886.3
Over 5 years through 10 years	9,257.3	9,415.0
Over 10 years	21,073.1	17,138.5
Available-for-sale Securities, Debt Maturities, Fair Value, Gross Subtotal, Total	35,924.2	31,972.4
Mortgage/Asset-Backed Securities	3,030.7	3,305.5
Total Fixed Maturity Securities	38,954.9	35,277.9
Available-for-Sale Securities, Unrealized Loss Position, Fair Value
Fair Value Maturity Distribution [Abstract]
1 year or less	45.9	163.6
Over 1 year through 5 years	531.3	242.9
Over 5 years through 10 years	1,399.1	981.1
Over 10 years	1,387.2	3,290.1
Available-for-sale Securities, Debt Maturities, Fair Value, Gross Subtotal, Total	3,363.5	4,677.7
Mortgage/Asset-Backed Securities	116.3	80.0
Total Fixed Maturity Securities	$ 3,479.8	$ 4,757.7

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Fair Values of Financial Instruments (Tables)

9 Months Ended

Sep. 30, 2011

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, and accrued investment income approximate fair value due to the short-term nature of the instruments. As such, these financial instruments are not included in the following chart.

	September 30, 2011				December 31, 2010
	Carrying Amount		Fair Value		Carrying Amount		Fair Value
	(in millions of dollars)
Assets
Fixed Maturity Securities	$	42,434.7	$	42,434.7	$	40,035.6	$	40,035.6
Mortgage Loans	1,606.9		1,789.9		1,516.8		1,685.4
Policy Loans	3,075.1		3,146.0		2,996.1		3,044.4
Other Long-term Investments
Derivatives	143.2		143.2		99.1		99.1
Equity Securities	10.4		10.4		10.4		10.4
Miscellaneous Long-term Investments	457.5		457.5		419.8		419.8
Liabilities
Policyholders’ Funds
Deferred Annuity Products	$	642.5	$	642.5	$	656.3	$	656.3
Supplementary Contracts without Life Contingencies	491.8		491.8		508.5		508.5
Short-term Debt	342.4		342.4		225.1		226.8
Long-term Debt	2,586.5		2,589.9		2,631.3		2,483.8
Other Liabilities
Derivatives	154.7		154.7		199.6		199.6
Embedded Derivative in Modified Coinsurance Arrangement	120.7		120.7		96.3		96.3
Unfunded Commitments to Investment Partnerships	158.6		158.6		169.9		169.9

Fair Value, Measurement Inputs, Disclosure

The categorization of fair value measurements by input level is as follows:

	September 30, 2011
	(in millions of dollars)
	Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
Assets
Fixed Maturity Securities
United States Government and Government Agencies and Authorities	$	324.7	$	968.9	$	—	$	1,293.6
States, Municipalities, and Political Subdivisions	31.5		1,554.9		—		1,586.4
Foreign Governments	—		1,474.7		—		1,474.7
Public Utilities	1,131.4		8,973.5		395.8		10,500.7
Mortgage/Asset-Backed Securities	—		3,127.4		19.6		3,147.0
All Other Corporate Bonds	5,183.6		18,725.4		466.8		24,375.8
Redeemable Preferred Stocks	—		34.8		21.7		56.5
Total Fixed Maturity Securities	6,671.2		34,859.6		903.9		42,434.7
Other Long-term Investments
Derivatives
Interest Rate Swaps and Forwards	—		140.8		—		140.8
Foreign Exchange Contracts	—		2.4		—		2.4
Total Derivatives	—		143.2		—		143.2
Equity Securities	—		—		10.4		10.4
Liabilities
Other Liabilities
Derivatives
Interest Rate Swaps	$	—	$	33.5	$	—	$	33.5
Foreign Exchange Contracts	—		121.2		—		121.2
Embedded Derivative in Modified Coinsurance Arrangement	—		—		120.7		120.7
Total Derivatives	—		154.7		120.7		275.4

	December 31, 2010
	(in millions of dollars)
	Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
Assets
Fixed Maturity Securities
United States Government and Government Agencies and Authorities	$	102.8	$	998.9	$	—	$	1,101.7
States, Municipalities, and Political Subdivisions	301.9		943.3		—		1,245.2
Foreign Governments	0.7		1,408.6		—		1,409.3
Public Utilities	840.1		8,670.5		173.6		9,684.2
Mortgage/Asset-Backed Securities	—		3,384.8		0.7		3,385.5
All Other Corporate Bonds	4,170.7		18,154.3		829.7		23,154.7
Redeemable Preferred Stocks	—		33.3		21.7		55.0
Total Fixed Maturity Securities	5,416.2		33,593.7		1,025.7		40,035.6
Other Long-term Investments
Derivatives
Interest Rate Swaps	—		98.4		—		98.4
Foreign Exchange Contracts	—		0.7		—		0.7
Total Derivatives	—		99.1		—		99.1
Equity Securities	—		8.9		1.5		10.4
Liabilities
Other Liabilities
Derivatives
Interest Rate Swaps	$	—	$	39.1	$	—	$	39.1
Foreign Exchange Contracts	—		160.5		—		160.5
Embedded Derivative in Modified Coinsurance Arrangement	—		—		96.3		96.3
Total Derivatives	—		199.6		96.3		295.9

Transfers of Assets between Level 1 and Level 2

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

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

	Three Months Ended September 30, 2010				Nine Months Ended September 30, 2010
	(in millions of dollars) Transfers into
	Level 1 from Level 2		Level 2 from Level 1		Level 1 from Level 2		Level 2 from Level 1
Fixed Maturity Securities
United States Government and Government Agencies and Authorities	$	17.1	$	20.5	$	110.8	$	—
States, Municipalities, and Political Subdivisions	123.7		40.0		55.4		59.5
Public Utilities	678.9		579.4		616.1		581.0
All Other Corporate Bonds	2,328.7		1,887.6		2,949.3		1,052.4
Redeemable Preferred Stock	—		—		—		5.5
Total Fixed Maturity Securities	$	3,148.4	$	2,527.5	$	3,731.6	$	1,698.4

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

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

	Three Months Ended September 30, 2011
	(in millions of dollars)
				Total Realized and Unrealized Investment Gains (Losses) Included in
	Beginning of Period			Earnings			Other Comprehensive Income or Loss			Purchases		Sales			Level 3 Transfers					End of Period
															Into		Out of
Fixed Maturity Securities
Public Utilities	$	217.9		$	0.1		$	9.3		$	30.0	$	(11.9	)	$	220.2	$	(69.8	)	$	395.8
Mortgage/Asset-Backed Securities	19.7			—			(0.1		)	—		—			—		—			19.6
All Other Corporate Bonds	528.3			—			1.3			—		(17.6		)	119.6		(164.8		)	466.8
Redeemable Preferred Stocks	22.6			—			(0.9		)	—		—			—		—			21.7
Total Fixed Maturity Securities	788.5			0.1			9.6			30.0		(29.5		)	339.8		(234.6		)	903.9
Equity Securities	3.6			(0.4		)	(2.4		)	—		—			9.6		—			10.4
Embedded Derivative in Modified Coinsurance Arrangement	(87.0		)	(33.7		)	—			—		—			—		—			(120.7		)
	Three Months Ended September 30, 2010
	(in millions of dollars)
				Total Realized and Unrealized Investment Gains Included in
	Beginning of Period			Earnings			Other Comprehensive Income or Loss			Purchases		Sales			Level 3 Transfers					End of Period
															Into		Out of
Fixed Maturity Securities
States, Municipalities, and Political Subdivisions	$	—		$	—		$	0.5		$	17.7	$	—		$	—	$	—		$	18.2
Public Utilities	72.4			—			6.8			—		(1.3		)	108.0		(28.0		)	157.9
Mortgage/Asset-Backed Securities	1.5			—			—			—		(0.8		)	—		—			0.7
All Other Corporate Bonds	430.1			—			11.1			3.1		(5.3		)	127.7		(44.1		)	522.6
Redeemable Preferred Stocks	21.3			—			—			—		—			—		(21.2		)	0.1
Total Fixed Maturity Securities	525.3			—			18.4			20.8		(7.4		)	235.7		(93.3		)	699.5
Equity Securities	8.9			—			1.8			—		—			—		—			10.7
Embedded Derivative in Modified Coinsurance Arrangement	(122.7		)	1.6			—			—		—			—		—			(121.1		)

	Nine Months Ended September 30, 2011
	(in millions of dollars)
				Total Realized and Unrealized Investment Gains (Losses) Included in
	Beginning of Year			Earnings			Other Comprehensive Income or Loss			Purchases		Sales			Level 3 Transfers					End of Period
															Into		Out of
Fixed Maturity Securities
Public Utilities	$	173.6		$	0.1		$	17.1		$	30.0	$	(15.7	)	$	299.7	$	(109.0	)	$	395.8
Mortgage/Asset-Backed Securities	0.7			—			(0.4		)	19.4		(0.1		)	—		—			19.6
All Other Corporate Bonds	829.7			(2.1		)	4.7			41.7		(32.5		)	96.2		(470.9		)	466.8
Redeemable Preferred Stocks	21.7			—			—			—		—			—		—			21.7
Total Fixed Maturity Securities	1,025.7			(2.0		)	21.4			91.1		(48.3		)	395.9		(579.9		)	903.9
Equity Securities	1.5			(0.4		)	(1.7		)	2.0		—			9.0		—			10.4
Embedded Derivative in Modified Coinsurance Arrangement	(96.3		)	(24.4		)	—			—		—			—		—			(120.7		)
	Nine Months Ended September 30, 2010
	(in millions of dollars)
				Total Realized and Unrealized Investment Gains (Losses) Included in
	Beginning of Year			Earnings			Other Comprehensive Income or Loss			Purchases		Sales			Level 3 Transfers					End of Period
															Into		Out of
Fixed Maturity Securities
States, Municipalities, and Political Subdivisions	$	—		$	—		$	0.5		$	17.7	$	—		$	—	$	—		$	18.2
Public Utilities	264.3			(1.0		)	9.9			—		(8.1		)	112.5		(219.7		)	157.9
Mortgage/Asset-Backed Securities	4.7			—			0.3			—		(4.3		)	—		—			0.7
All Other Corporate Bonds	580.0			(1.8		)	47.5			3.1		(41.8		)	208.6		(273.0		)	522.6
Redeemable Preferred Stocks	20.4			—			—			—		—			—		(20.3		)	0.1
Total Fixed Maturity Securities	869.4			(2.8		)	58.2			20.8		(54.2		)	321.1		(513.0		)	699.5
Equity Securities	1.5			—			2.4			6.9		(0.1		)	—		—			10.7
Embedded Derivative in Modified Coinsurance Arrangement	(117.4		)	(3.7		)	—			—		—			—		—			(121.1		)

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CONSOLIDATED BALANCE SHEETS (USD $) In Millions	Sep. 30, 2011	Dec. 31, 2010
Investments
Fixed Maturity Securities - at fair value (amortized cost: $36,746.7; $36,546.6)	$ 42,434.7	$ 40,035.6
Mortgage Loans	1,606.9	1,516.8
Policy Loans	3,075.1	2,996.1
Other Long-term Investments	611.1	529.3
Short-term Investments	1,035.9	1,163.1
Total Investments	48,763.7	46,240.9
Other Assets
Cash and Bank Deposits	52.2	53.6
Accounts and Premiums Receivable	1,680.4	1,665.8
Reinsurance Recoverable	4,923.1	4,827.9
Accrued Investment Income	695.5	669.8
Deferred Acquisition Costs	2,572.4	2,521.1
Goodwill	201.2	201.2
Property and Equipment	492.1	476.8
Other Assets	660.3	650.6
Total Assets	60,040.9	57,307.7
Liabilities
Policy and Contract Benefits	1,517.5	1,565.0
Reserves for Future Policy and Contract Benefits	41,633.4	39,715.0
Unearned Premiums	493.5	436.7
Other Policyholders' Funds	1,603.5	1,669.7
Income Tax Payable	82.6	135.7
Deferred Income Tax	795.3	417.2
Short-term Debt	342.4	225.1
Long-term Debt	2,586.5	2,631.3
Other Liabilities	1,526.1	1,567.6
Total Liabilities	50,580.8	48,363.3
Commitments and Contingent Liabilities - Note 9
Stockholders' Equity
Common Stock, $0.10 par, Authorized: 725,000,000 shares Issued: 358,312,558 and 364,842,919 shares	35.8	36.5
Additional Paid-in Capital	2,580.9	2,615.4
Accumulated Other Comprehensive Income (Loss)
Net Unrealized Gain on Securities Not Other-Than-Temporarily Impaired	885.6	408.3
Net Unrealized Gain on Securities Other-Than-Temporarily Impaired	0	2.1
Net Gain on Cash Flow Hedges	421.1	361.0
Foreign Currency Translation Adjustment	(116.9)	(110.9)
Unrecognized Pension and Postretirement Benefit Costs	(303.6)	(318.6)
Retained Earnings	7,487.3	7,060.8
Treasury Stock - at cost: 65,975,613 shares and 48,269,467 shares	(1,530.1)	(1,110.2)
Total Stockholders' Equity	9,460.1	8,944.4
Total Liabilities and Stockholders' Equity	$ 60,040.9	$ 57,307.7

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Mortgage Loans by Property Type (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2011	Dec. 31, 2010
Mortgage Loans on Real Estate [Line Items]
Carrying Amount	$ 1,606.9	$ 1,516.8
Percent of Total	100.00%	100.00%
Apartment
Mortgage Loans on Real Estate [Line Items]
Carrying Amount	28.1	33.7
Percent of Total	1.70%	2.20%
Industrial
Mortgage Loans on Real Estate [Line Items]
Carrying Amount	518.2	458.2
Percent of Total	32.30%	30.20%
Mixed
Mortgage Loans on Real Estate [Line Items]
Carrying Amount	94.1	95.8
Percent of Total	5.90%	6.30%
Office
Mortgage Loans on Real Estate [Line Items]
Carrying Amount	658.1	634.7
Percent of Total	41.00%	41.90%
Retail
Mortgage Loans on Real Estate [Line Items]
Carrying Amount	301.2	286.9
Percent of Total	18.70%	18.90%
Other
Mortgage Loans on Real Estate [Line Items]
Carrying Amount	$ 7.2	$ 7.5
Percent of Total	0.40%	0.50%

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Derivative Financial Instruments - Additional Information (Detail) (USD $) In Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2011	Sep. 30, 2011	Sep. 30, 2010	Jun. 30, 2011	Dec. 31, 2010
Derivative [Line Items]
Current credit exposure on derivatives	$ 23.2	$ 23.2
Cash collateral from counterparties	0	0			39.1
Carrying value of fixed maturity securities posted as collateral to our counterparties	131.6	131.6			158.8
Cash Collateral to counterparties	0	0
Aggregate fair value of all derivative instruments with credit risk-related contingent features in a liability position	154.7	154.7			199.6
Notional amount of forward starting interest rate swaps to hedge anticipated purchase of long-term bonds	385.0	385.0			540.0
Notional amount of foreign currency cash flow hedges	574.7	574.7			617.9
Notional Value	1,498.7	1,498.7		1,538.7	1,681.9
Notional amount of terminated swaps	55.0	230.1
Derivative Instruments Gain Loss Included in Accumulated Other Comprehensive Loss Income		(0.1)
Cash Flow Hedge Ineffectiveness is Immaterial		0	0
Approximate amount of net deferred gains on derivative instruments expected to be amortized during the next twelve months		33.6
Ineffectiveness on Interest Rate Fair Value Hedges is Immaterial		0
Swaps | Derivative Financial Instruments Receive Variable Pay Fixed [Member]
Derivative [Line Items]
Notional amount of receive variable, pay fixed interest rate swaps to hedge changes in fair value of certain fixed rate securities held	174.0	174.0
Notional Value	174.0	174.0		174.0	174.0
Notional amount of terminated swaps	0	0
Hedged benchmark interest rate, on the related interest rate swaps		8.7	15.9
Swaps | Derivative Financial Instruments Receive Fixed Pay Variable [Member]
Derivative [Line Items]
Notional Value	735.0	735.0		785.0	890.0
Notional amount of terminated swaps	50.0	155.0
Notional amount of hedging instrument	350.0	350.0
Loss on the hedged fixed maturity securities attributable to the hedged benchmark interest rate		22.0
Derivative Financial Instruments Receive Fixed Pay Variable [Member]
Derivative [Line Items]
Notional Value	385.0	385.0
Forward Starting interest rate swap on anticipation of issuance of LT debt [Member]
Derivative [Line Items]
Notional amount of forward starting interest rate swaps to hedge anticipated purchase of long-term bonds			250.0
Derivative Instruments Gain Loss Included in Accumulated Other Comprehensive Loss Income		18.5
Forward Contracts [Member]
Derivative [Line Items]
Notional Value	15.0	15.0		0	0
Notional amount of terminated swaps	$ 0	$ 31.9

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Stockholders' Equity and Earnings Per Common Share - Additional Information (Detail) (USD $) In Millions, except Share data	3 Months Ended			9 Months Ended		12 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended
	Sep. 30, 2011	Mar. 31, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010	Dec. 31, 2010	Sep. 30, 2011 Share Repurchase Program Expire In August 2012	Dec. 31, 2010 Share Repurchase Program Expire in May 2011 [Member]	Sep. 30, 2011 Accelerated share repurchase agreement	Mar. 18, 2011 Accelerated share repurchase agreement
Stockholders Equity Note [Line Items]
Outstanding stock options, exercise prices range, lower limit	$ 11.37			$ 11.37
Outstanding stock options, exercise prices range, upper limit	$ 26.29			$ 26.29
Outstanding Nonvested stock awards, grant prices range, lower limit	$ 10.59			$ 10.59
Outstanding Nonvested stock awards, grant prices range, upper limit	$ 26.31			$ 26.31
Outstanding Performance restricted stock units, threshold stock price	$ 26.00			$ 26.00
Antidilutive common shares not included in the computation of dilutive earnings per share	2,400,000		3,600,000	2,100,000	3,600,000
Authorized repurchase of common stock, value							$ 1,000.0	$ 500.0
Treasury Stock Acquired, Shares			9,500,000		15,200,000	16,400,000	7,700,000		7,100,000
Treasury Stock Acquired in Open Market, Value	250.2			419.9
Common stock repurchased			197.7		327.5	356.0			200.0
Stock Repurchase Program Remaining Authorized Repurchase Amount				524.7
Shares repurchased cost, Commissions	$ 0.2		$ 0.2	$ 0.3	$ 0.3	$ 0.3
Price adjustment receipt in shares of Unum Group common stock										600,000
Treasury Stock Shares Retired		7,700,000
Treasury Stock Acquired in Open Market, Shares	11,100,000			17,700,000
Preferred stock, par value	$ 0.10			$ 0.10
Preferred stock, authorized	25,000,000			25,000,000

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Timing of Anticipated Settlements of Interest Rate Swaps Outstanding (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2011	Jun. 30, 2011	Dec. 31, 2010
Derivative [Line Items]
Notional Value	$ 1,498.7	$ 1,538.7	$ 1,681.9
Weighted Average Receive Rate	6.26%
Weighted Average pay rate	0.37%
Receive Fixed/Pay Variable
Derivative [Line Items]
Notional Value	385.0
2011
Derivative [Line Items]
Notional Value	50.0
Weighted Average Receive Rate	5.16%
Weighted Average pay rate	0.37%
2012
Derivative [Line Items]
Notional Value	185.0
Weighted Average Receive Rate	6.49%
Weighted Average pay rate	0.37%
2013
Derivative [Line Items]
Notional Value	$ 150.0
Weighted Average Receive Rate	6.34%
Weighted Average pay rate	0.37%

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Location and Fair Values of Derivative Financial Instruments (Detail) (USD $) In Millions	Sep. 30, 2011	Dec. 31, 2010
Designated as Hedging Instrument | Interest Rate Swaps | Other Long term Investments
Derivative [Line Items]
Asset Derivatives Fair Value	$ 140.8	$ 98.4
Designated as Hedging Instrument | Interest Rate Swaps | Other Liability
Derivative [Line Items]
Liability Derivatives Fair Value	33.5	39.1
Designated as Hedging Instrument | Foreign Exchange Contracts | Other Long term Investments
Derivative [Line Items]
Asset Derivatives Fair Value	2.4	0.7
Designated as Hedging Instrument | Foreign Exchange Contracts | Other Liability
Derivative [Line Items]
Liability Derivatives Fair Value	121.2	160.5
Designated as Hedging Instrument | Other Long term Investments
Derivative [Line Items]
Asset Derivatives Fair Value	143.2	99.1
Designated as Hedging Instrument | Other Liability
Derivative [Line Items]
Liability Derivatives Fair Value	154.7	199.6
Not Designated as Hedging Instrument | Embedded Derivative in Modified Coinsurance Arrangement | Other Liability
Derivative [Line Items]
Liability Derivatives Fair Value	$ 120.7	$ 96.3

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Components of Net Periodic Benefit Cost (Detail) (USD $) In Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Pension Benefits, U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Service Cost	$ 10.7	$ 9.2	$ 32.0	$ 27.4
Interest Cost	19.4	17.8	58.2	53.4
Expected Return on Plan Assets	(21.9)	(17.7)	(65.7)	(52.9)
Defined Benefit Plan, Net Periodic Benefit Cost	16.1	16.6	48.1	49.8
Amortization of:
Net Actuarial Loss	8.0	7.4	24.0	22.3
Prior Service Credit	(0.1)	(0.1)	(0.4)	(0.4)
Pension Benefits, Non U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Service Cost	1.1	0.9	3.5	3.4
Interest Cost	2.3	2.4	6.7	7.1
Expected Return on Plan Assets	(3.1)	(2.7)	(9.2)	(7.9)
Defined Benefit Plan, Net Periodic Benefit Cost	0.3	1.2	1.0	4.4
Amortization of:
Net Actuarial Loss	0	0.6	0	1.8
Prior Service Credit	0	0	0	0
Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Service Cost	0.5	0.6	1.4	1.9
Interest Cost	2.5	2.7	7.5	8.1
Expected Return on Plan Assets	(0.2)	(0.2)	(0.5)	(0.5)
Defined Benefit Plan, Net Periodic Benefit Cost	2.2	2.5	6.5	7.6
Amortization of:
Net Actuarial Loss	0	0	0	0
Prior Service Credit	$ (0.6)	$ (0.6)	$ (1.9)	$ (1.9)

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Mortgage Loans by Geographic Region (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2011	Dec. 31, 2010
Mortgage Loans on Real Estate [Line Items]
Carrying Amount	$ 1,606.9	$ 1,516.8
Percent of Total	100.00%	100.00%
New England
Mortgage Loans on Real Estate [Line Items]
Carrying Amount	148.2	146.8
Percent of Total	9.20%	9.70%
Mid-Atlantic
Mortgage Loans on Real Estate [Line Items]
Carrying Amount	172.3	184.8
Percent of Total	10.70%	12.20%
East North Central
Mortgage Loans on Real Estate [Line Items]
Carrying Amount	214.0	171.7
Percent of Total	13.30%	11.30%
West North Central
Mortgage Loans on Real Estate [Line Items]
Carrying Amount	152.4	134.6
Percent of Total	9.50%	8.90%
South Atlantic
Mortgage Loans on Real Estate [Line Items]
Carrying Amount	390.5	372.0
Percent of Total	24.30%	24.50%
East South Central
Mortgage Loans on Real Estate [Line Items]
Carrying Amount	52.7	26.9
Percent of Total	3.30%	1.80%
West South Central
Mortgage Loans on Real Estate [Line Items]
Carrying Amount	161.9	171.8
Percent of Total	10.10%	11.30%
Mountain
Mortgage Loans on Real Estate [Line Items]
Carrying Amount	59.2	60.7
Percent of Total	3.70%	4.00%
Pacific
Mortgage Loans on Real Estate [Line Items]
Carrying Amount	$ 255.7	$ 247.5
Percent of Total	15.90%	16.30%