Investments (Tables)

9 Months Ended

Sep. 30, 2013

Available-for-sale Securities Including Securities Pledged [Line Items]

Marketable Securities

Available-for-sale and fair value option ("FVO") fixed maturities and equity securities were as follows as of September 30, 2013:

	Amortized Cost		Gross Unrealized Capital Gains		Gross Unrealized Capital Losses		Embedded Derivatives(2)		Fair Value		OTTI(3)
Fixed maturities:
U.S. Treasuries	$	745.0	$	58.1	$	2.4	$	—	$	800.7	$	—
U.S. Government agencies and authorities	242.9		7.4		—		—		250.3		—
State, municipalities and political subdivisions	77.2		6.8		0.1		—		83.9		—
U.S. corporate securities	10,210.0		584.6		225.8		—		10,568.8		1.9
Foreign securities:(1)
Government	426.8		27.0		16.2		—		437.6		—
Other	5,077.2		286.4		90.9		—		5,272.7		—
Total foreign securities	5,504.0		313.4		107.1		—		5,710.3		—
Residential mortgage-backed securities:
Agency	1,628.1		128.6		12.7		19.3		1,763.3		0.5
Non-Agency	302.9		55.8		8.6		13.6		363.7		14.1
Total Residential mortgage-backed securities	1,931.0		184.4		21.3		32.9		2,127.0		14.6
Commercial mortgage-backed securities	607.8		71.4		—		—		679.2		4.4
Other asset-backed securities	482.9		19.7		3.7		—		498.9		3.2
Total fixed maturities, including securities pledged	19,800.8		1,245.8		360.4		32.9		20,719.1		24.1
Less: Securities pledged	178.0		9.4		7.0		—		180.4		—
Total fixed maturities	19,622.8		1,236.4		353.4		32.9		20,538.7		24.1
Equity securities	111.2		16.1		—		—		127.3		—
Total fixed maturities and equity securities investments	$	19,734.0	$	1,252.5	$	353.4	$	32.9	$	20,666.0	$	24.1

⁽¹⁾ Primarily U.S. dollar denominated.

⁽²⁾ Embedded derivatives within fixed maturity securities are reported with the host investment. The changes in fair value of embedded derivatives are reported in Other net realized capital gains (losses) in the Condensed Consolidated Statements of Operations.

⁽³⁾ Represents Other-than Temporary-Impairments ("OTTI") reported as a component of Other comprehensive income.

Available-for-sale and FVO fixed maturities and equity securities were as follows as of December 31, 2012:

	Amortized Cost		Gross Unrealized Capital Gains		Gross Unrealized Capital Losses		Embedded Derivatives(2)		Fair Value		OTTI(3)
Fixed maturities:
U.S. Treasuries	$	1,011.5	$	135.6	$	0.5	$	—	$	1,146.6	$	—
U.S. Government agencies and authorities	379.4		17.6		—		—		397.0		—
State, municipalities and political subdivisions	77.2		15.9		—		—		93.1		—
U.S. corporate securities	9,438.0		1,147.4		11.1		—		10,574.3		2.0
Foreign securities(1):
Government	439.7		57.4		1.1		—		496.0		—
Other	4,570.0		501.3		15.3		—		5,056.0		—
Total foreign securities	5,009.7		558.7		16.4		—		5,552.0		—
Residential mortgage-backed securities:
Agency	1,679.5		181.5		3.4		33.7		1,891.3		0.6
Non-Agency	390.9		70.0		14.7		20.0		466.2		17.4
Total Residential mortgage-backed securities	2,070.4		251.5		18.1		53.7		2,357.5		18.0
Commercial mortgage-backed securities	748.7		90.6		0.2		—		839.1		4.4
Other asset-backed securities	475.7		26.6		6.7		—		495.6		3.1
Total fixed maturities, including securities pledged	19,210.6		2,243.9		53.0		53.7		21,455.2		27.5
Less: Securities pledged	207.2		13.0		0.5		—		219.7		—
Total fixed maturities	19,003.4		2,230.9		52.5		53.7		21,235.5		27.5
Equity securities	129.3		13.6		0.1		—		142.8		—
Total fixed maturities and equity securities investments	$	19,132.7	$	2,244.5	$	52.6	$	53.7	$	21,378.3	$	27.5

⁽¹⁾ Primarily U.S. dollar denominated.

⁽²⁾ Embedded derivatives within fixed maturity securities are reported with the host investment. The changes in fair value of embedded derivatives are reported in Other net realized capital gains (losses) in the Condensed Consolidated Statements of Operations.

⁽³⁾ Represents OTTI reported as a component of Other comprehensive income.

Investments Classifed by Contractual Maturity Date

The amortized cost and fair value of fixed maturities, including securities pledged, as of September 30, 2013, are shown below by contractual maturity. Actual maturities may differ from contractual maturities as securities may be restructured, called or prepaid. Mortgage-backed securities ("MBS") and Other asset-backed securities ("ABS") are shown separately because they are not due at a single maturity date.

	Amortized Cost		Fair Value
Due to mature:
One year or less	$	570.1	$	591.4
After one year through five years	4,171.7		4,437.9
After five years through ten years	6,281.1		6,462.9
After ten years	5,756.2		5,921.8
Mortgage-backed securities	2,538.8		2,806.2
Other asset-backed securities	482.9		498.9
Fixed maturities, including securities pledged	$	19,800.8	$	20,719.1

U.S. and Foreign Corporate Securities by Industry

The following tables set forth the composition of the U.S. and foreign corporate securities within the fixed maturity portfolio by industry category as of the dates indicated:

	Amortized Cost		Gross Unrealized Capital Gains		Gross Unrealized Capital Losses		Fair Value
September 30, 2013
Communications	$	1,327.7	$	78.9	$	40.9	$	1,365.7
Financial	1,999.8		161.0		22.0		2,138.8
Industrial and other companies	8,896.5		440.0		206.6		9,129.9
Utilities	2,628.0		167.1		37.8		2,757.3
Transportation	435.2		24.0		9.4		449.8
Total	$	15,287.2	$	871.0	$	316.7	$	15,841.5
December 31, 2012
Communications	$	1,154.1	$	161.4	$	0.9	$	1,314.6
Financial	1,859.3		240.1		10.9		2,088.5
Industrial and other companies	7,883.1		850.9		6.9		8,727.1
Utilities	2,715.4		349.8		7.3		3,057.9
Transportation	396.1		46.5		0.4		442.2
Total	$	14,008.0	$	1,648.7	$	26.4	$	15,630.3

Schedule of Unrealized Loss on Investments

Unrealized capital losses (including noncredit impairments), along with the fair value of fixed maturity securities, including securities pledged, by market sector and duration were as follows as of September 30, 2013:

	Six Months or Less Below Amortized Cost				More Than Six Months and Twelve Months or Less Below Amortized Cost				More Than Twelve Months Below Amortized Cost				Total
	Fair Value		Unrealized Capital Losses		Fair Value		Unrealized Capital Losses		Fair Value		Unrealized Capital Losses		Fair Value		Unrealized Capital Losses
U.S. Treasuries	$	144.5	$	2.4	$	—	$	—	$	—	$	—	$	144.5	$	2.4
U.S. corporate, state and municipalities	3,116.0		183.4		294.7		35.6		40.9		6.9		3,451.6		225.9
Foreign	1,280.2		82.3		158.5		19.4		39.6		5.4		1,478.3		107.1
Residential mortgage-backed	299.3		8.8		19.7		1.0		108.1		11.5		427.1		21.3
Commercial mortgage-backed	3.8		—		0.1		—		—		—		3.9		—
Other asset-backed	56.2		0.2		6.1		—		26.5		3.5		88.8		3.7
Total	$	4,900.0	$	277.1	$	479.1	$	56.0	$	215.1	$	27.3	$	5,594.2	$	360.4

Unrealized capital losses (including noncredit impairments), along with the fair value of fixed maturity securities, including securities pledged, by market sector and duration were as follows as of December 31, 2012:

	Six Months or Less Below Amortized Cost				More Than Six Months and Twelve Months or Less Below Amortized Cost				More Than Twelve Months Below Amortized Cost				Total
	Fair Value		Unrealized Capital Losses		Fair Value		Unrealized Capital Losses		Fair Value		Unrealized Capital Losses		Fair Value		Unrealized Capital Losses
U.S. Treasuries	$	300.0	$	0.5	$	—	$	—	$	—	$	—	$	300.0	$	0.5
U.S. corporate, state and municipalities	479.8		6.8		22.5		0.9		49.4		3.4		551.7		11.1
Foreign	166.8		4.7		7.8		0.5		87.7		11.2		262.3		16.4
Residential mortgage-backed	68.7		1.6		7.2		0.3		132.4		16.2		208.3		18.1
Commercial mortgage-backed	7.5		0.1		1.6		—		2.5		0.1		11.6		0.2
Other asset-backed	15.6		—		—		—		34.2		6.7		49.8		6.7
Total	$	1,038.4	$	13.7	$	39.1	$	1.7	$	306.2	$	37.6	$	1,383.7	$	53.0

Risk Exposure to Securities Based on Credit Quality

The following tables summarize the Company's exposure to CMBS holdings by credit quality using NAIC designations, ARO ratings and vintage year as of the dates indicated:

	% of Total CMBS
	NAIC Designation			ARO Ratings			Vintage
September 30, 2013
	1	99.4	%	AAA	48.6	%	2007	30.5	%
	2	—	%	AA	14.6	%	2006	24.4	%
	3	0.6	%	A	8.0	%	2005 and prior	45.1	%
	4	—	%	BBB	7.1	%		100.0	%
	5	—	%	BB and below	21.7	%
	6	—	%		100.0	%
		100.0	%
December 31, 2012
	1	99.9	%	AAA	54.1	%	2007	28.7	%
	2	—	%	AA	17.1	%	2006	20.4	%
	3	0.1	%	A	8.4	%	2005 and prior	50.9	%
	4	—	%	BBB	5.3	%		100.0	%
	5	—	%	BB and below	15.1	%
	6	—	%		100.0	%
		100.0	%

The following tables summarize the Company's exposure to subprime mortgage-backed securities by credit quality using NAIC designations, ARO ratings and vintage year as of the dates indicated:

	% of Total Subprime Mortgage-backed Securities
	NAIC Designation			ARO Ratings			Vintage
September 30, 2013
	1	68.3	%	AAA	0.1	%	2007	7.0	%
	2	2.7	%	AA	2.6	%	2006	7.0	%
	3	19.1	%	A	13.0	%	2005 and prior	86.0	%
	4	9.6	%	BBB	20.8	%		100.0	%
	5	—	%	BB and below	63.5	%
	6	0.3	%		100.0	%
		100.0	%
December 31, 2012
	1	67.8	%	AAA	3.2	%	2007	8.0	%
	2	3.2	%	AA	—	%	2006	6.0	%
	3	19.6	%	A	16.2	%	2005 and prior	86.0	%
	4	8.7	%	BBB	21.5	%		100.0	%
	5	0.5	%	BB and below	59.1	%
	6	0.2	%		100.0	%
		100.0	%

The following tables summarize the Company's exposure to Alt-A residential mortgage-backed securities by credit quality using NAIC designations, ARO ratings and vintage year as of the dates indicated:

	% of Total Alt-A Mortgage-backed Securities
	NAIC Designation			ARO Ratings			Vintage
September 30, 2013
	1	43.2	%	AAA	0.1	%	2007	14.3	%
	2	12.8	%	AA	—	%	2006	29.8	%
	3	30.6	%	A	2.9	%	2005 and prior	55.9	%
	4	11.4	%	BBB	3.5	%		100.0	%
	5	2.0	%	BB and below	93.5	%
	6	—	%		100.0	%
		100.0	%
December 31, 2012
	1	33.4	%	AAA	0.2	%	2007	13.8	%
	2	12.4	%	AA	1.4	%	2006	29.3	%
	3	21.0	%	A	3.4	%	2005 and prior	56.9	%
	4	30.3	%	BBB	5.6	%		100.0	%
	5	2.3	%	BB and below	89.4	%
	6	0.6	%		100.0	%
		100.0	%

The following tables summarize the Company's exposure to Other ABS holdings, excluding subprime exposure, by credit quality using NAIC designations, ARO ratings and vintage year as of the dates indicated:

	% of Total Other ABS
	NAIC Designation			ARO Ratings			Vintage
September 30, 2013
	1	99.4	%	AAA	90.5	%	2013	9.0	%
	2	0.5	%	AA	2.7	%	2012	21.0	%
	3	0.1	%	A	6.2	%	2011	11.7	%
	4	—	%	BBB	0.5	%	2010	5.0	%
	5	—	%	BB and below	0.1	%	2009	0.3	%
	6	—	%		100.0	%	2008	8.1	%
		100.0	%				2007 and prior	44.9	%
								100.0	%
December 31, 2012
	1	98.3	%	AAA	88.4	%	2012	21.4	%
	2	1.6	%	AA	1.9	%	2011	12.2	%
	3	0.1	%	A	8.0	%	2010	5.7	%
	4	—	%	BBB	1.6	%	2009	0.3	%
	5	—	%	BB and below	0.1	%	2008	9.5	%
	6	—	%		100.0	%	2007	22.9	%
		100.0	%				2006 and prior	28.0	%
								100.0	%

Schedule of Mortgage Loans Real Estate and Valuation Allowance

The following table summarizes the Company's investment in mortgage loans as of the dates indicated:

	September 30, 2013			December 31, 2012
Commercial mortgage loans	$	3,284.2		$	2,874.0
Collective valuation allowance	(1.4		)	(1.3		)
Total net commercial mortgage loans	$	3,282.8		$	2,872.7

The following table summarizes the activity in the allowance for losses for all commercial mortgage loans for the periods indicated:

	September 30, 2013		December 31, 2012
Collective valuation allowance for losses, balance at January 1	$	1.3	$	1.3
Addition to (reduction of) allowance for losses	0.1		—
Collective valuation allowance for losses, end of period	$	1.4	$	1.3

Impaired Financing Receivables

The following table presents information on the average investment during the period in impaired loans and interest income recognized on impaired and troubled debt restructured loans for the periods indicated:

	Three Months Ended September 30,
	2013		2012
Impaired loans, average investment during the period (amortized cost)	$	24.2	$	5.7
Interest income recognized on impaired loans, on an accrual basis	0.5		0.1
Interest income recognized on impaired loans, on a cash basis	0.5		0.1
Interest income recognized on troubled debt restructured loans, on an accrual basis	0.4		—
	Nine Months Ended September 30,
	2013		2012
Impaired loans, average investment during the period (amortized cost)	$	24.3	$	5.8
Interest income recognized on impaired loans, on an accrual basis	0.7		0.3
Interest income recognized on impaired loans, on a cash basis	0.7		0.3
Interest income recognized on troubled debt restructured loans, on an accrual basis	0.4		—

The carrying values and unpaid principal balances of impaired mortgage loans were as follows as of the dates indicated:

	September 30, 2013		December 31, 2012
Impaired loans with allowances for losses	$	—	$	—
Impaired loans without allowances for losses	42.9		5.6
Subtotal	42.9		5.6
Less: Allowances for losses on impaired loans	—		—
Impaired loans, net	$	42.9	$	5.6
Unpaid principal balance of impaired loans	$	44.4	$	7.1

Troubled Debt Restructurings on Financing Receivables

The following table presents information on restructured loans as of the dates indicated:

	September 30, 2013		December 31, 2012
Troubled debt restructured loans	$	37.5	$	—

Loans Receivable, Grouped by Loan to Value and Debt Service Coverage Ratio

Loan-to-value ("LTV") and debt service coverage ("DSC") ratios are measures commonly used to assess the risk and quality of mortgage loans. The LTV ratio, calculated at time of origination, is expressed as a percentage of the amount of the loan relative to the value of the underlying property. A LTV ratio in excess of 100% indicates the unpaid loan amount exceeds the underlying collateral. The DSC ratio, based upon the most recently received financial statements, is expressed as a percentage of the amount of a property’s net income to its debt service payments. A DSC ratio of less than 1.0 indicates that a property’s operations do not generate sufficient income to cover debt payments. These ratios are utilized as part of the review process described above.

The following table presents the LTV ratios as of the dates indicated:

	September 30, 2013(1)		December 31, 2012(1)
Loan-to-Value Ratio:
0% - 50%	$	499.4	$	501.3
50% - 60%	859.2		768.9
60% - 70%	1,797.2		1,491.6
70% - 80%	115.4		96.4
80% and above	13.0		15.8
Total Commercial mortgage loans	$	3,284.2	$	2,874.0

⁽¹⁾ Balances do not include allowance for mortgage loan credit losses.

The following table presents the DSC ratios as of the dates indicated:

	September 30, 2013(1)		December 31, 2012(1)
Debt Service Coverage Ratio:
Greater than 1.5x	$	2,392.0	$	2,114.4
1.25x - 1.5x	512.9		390.5
1.0x - 1.25x	257.1		293.1
Less than 1.0x	122.2		76.0
Total Commercial mortgage loans	$	3,284.2	$	2,874.0

⁽¹⁾ Balances do not include allowance for mortgage loan credit losses.

Mortgage Loans by Geographic Location of Collateral

Properties collateralizing mortgage loans are geographically dispersed throughout the United States, as well as diversified by property type, as reflected in the following tables as of the dates indicated:

	September 30, 2013(1)				December 31, 2012(1)
	Gross Carrying Value		% of Total		Gross Carrying Value		% of Total
Commercial Mortgage Loans by U.S. Region:
Pacific	$	651.0	19.8	%	$	564.1	19.6	%
South Atlantic	679.9		20.7	%	561.0		19.5	%
West South Central	501.3		15.3	%	460.4		16.0	%
Middle Atlantic	407.6		12.4	%	332.7		11.6	%
East North Central	376.5		11.5	%	337.8		11.8	%
Mountain	250.1		7.6	%	214.5		7.5	%
West North Central	223.2		6.8	%	205.2		7.1	%
New England	116.2		3.5	%	119.1		4.1	%
East South Central	78.4		2.4	%	79.2		2.8	%
Total Commercial mortgage loans	$	3,284.2	100.0	%	$	2,874.0	100.0	%

⁽¹⁾ Balances do not include allowance for mortgage loan credit losses.

	September 30, 2013(1)				December 31, 2012(1)
	Gross Carrying Value		% of Total		Gross Carrying Value		% of Total
Commercial Mortgage Loans by Property Type:
Industrial	$	1,028.6	31.3	%	$	1,035.2	36.0	%
Retail	1,041.2		31.6	%	824.0		28.7	%
Office	448.9		13.7	%	427.0		14.8	%
Apartments	372.8		11.4	%	298.7		10.4	%
Hotel/Motel	139.7		4.3	%	92.1		3.2	%
Mixed Use	70.2		2.1	%	34.2		1.2	%
Other	182.8		5.6	%	162.8		5.7	%
Total Commercial mortgage loans	$	3,284.2	100.0	%	$	2,874.0	100.0	%

Mortgage Loans by Property Type of Collateral

	September 30, 2013(1)				December 31, 2012(1)
	Gross Carrying Value		% of Total		Gross Carrying Value		% of Total
Commercial Mortgage Loans by Property Type:
Industrial	$	1,028.6	31.3	%	$	1,035.2	36.0	%
Retail	1,041.2		31.6	%	824.0		28.7	%
Office	448.9		13.7	%	427.0		14.8	%
Apartments	372.8		11.4	%	298.7		10.4	%
Hotel/Motel	139.7		4.3	%	92.1		3.2	%
Mixed Use	70.2		2.1	%	34.2		1.2	%
Other	182.8		5.6	%	162.8		5.7	%
Total Commercial mortgage loans	$	3,284.2	100.0	%	$	2,874.0	100.0	%

⁽¹⁾ Balances do not include allowance for mortgage loan credit losses.

Mortgage Loans by Year of Origination

The following table sets forth the breakdown of mortgages by year of origination as of the dates indicated:

	September 30, 2013(1)		December 31, 2012(1)
Year of Origination:
2013	$	582.2	$	—
2012	916.7		939.0
2011	811.9		836.9
2010	121.7		124.0
2009	68.7		73.0
2008	94.7		119.0
2007 and prior	688.3		782.1
Total Commercial mortgage loans	$	3,284.2	$	2,874.0

⁽¹⁾ Balances do not include allowance for mortgage loan credit losses.

Other than Temporary Impairment, Credit Losses Recognized in Earnings

The following tables identify the Company's credit-related and intent-related impairments included in the Condensed Consolidated Statements of Operations, excluding impairments included in Other comprehensive income (loss) by type for the periods indicated:

	Three Months Ended September 30,
	2013			2012
	Impairment		No. of Securities	Impairment		No. of Securities
U.S. corporate	$	—	—	$	1.3	1
Foreign(1)	—		—	—		—
Residential mortgage-backed	0.4		14	2.9		23
Commercial mortgage-backed	0.1		1	—		—
Other asset-backed	0.2		1	0.4		3
Equity securities	0.1		1	—		—
Total	$	0.8	17	$	4.6	27
(1) Primarily U.S. dollar denominated.
	Nine Months Ended September 30,
	2013			2012
	Impairment		No. of Securities	Impairment		No. of Securities
U.S. corporate	$	—	—	$	1.5	2
Foreign(1)	—		—	0.8		3
Residential mortgage-backed	2.2		32	4.5		30
Commercial mortgage-backed	0.2		3	—		—
Other asset-backed	0.2		1	0.8		4
Equity securities	0.1		1	—		—
Total	$	2.7	37	$	7.6	39
(1) Primarily U.S. dollar denominated.

Net Investment Income

The following table summarizes Net investment income for the periods indicated:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2013		2012		2013		2012
Fixed maturities	$	292.2	$	308.2	$	900.5	$	916.2
Equity securities, available-for-sale	1.7		2.6		1.6		6.7
Mortgage loans on real estate	39.0		35.0		116.5		106.1
Policy loans	3.2		3.3		9.6		9.9
Short-term investments and cash equivalents	0.2		0.3		0.7		0.8
Other	3.9		6.3		26.8		2.9
Gross investment income	340.2		355.7		1,055.7		1,042.6
Less: Investment expenses	12.0		11.0		36.4		34.0
Net investment income	$	328.2	$	344.7	$	1,019.3	$	1,008.6

Realized Gain (Loss) on Investments

Net realized capital gains (losses) were as follows for the periods indicated:

	Three Months Ended September 30,						Nine Months Ended September 30,
	2013			2012			2013			2012
Fixed maturities, available-for-sale, including securities pledged	$	(6.5	)	$	1.5		$	(8.7	)	$	58.8
Fixed maturities, at fair value option	(26.0		)	(31.7		)	(131.1		)	(78.0		)
Equity securities, available-for-sale	0.1			(0.2		)	0.1			(0.2		)
Derivatives	(10.1		)	(12.7		)	(71.9		)	13.5
Embedded derivative - fixed maturities	(3.6		)	(4.1		)	(20.8		)	(4.3		)
Embedded derivative - product guarantees	17.9			21.3			94.4			110.8
Other investments	0.1			0.2			(0.1		)	(0.2		)
Net realized capital gains (losses)	$	(28.1	)	$	(25.7	)	$	(138.1	)	$	100.4
After-tax net realized capital gains (losses)	$	(46.9	)	$	(6.7	)	$	(120.3	)	$	65.3

Gain (Loss) on Investments

Proceeds from the sale of fixed maturities and equity securities, available-for-sale and the related gross realized gains and losses, before tax were as follows for the periods indicated:

	Nine Months Ended September 30,
	2013		2012
Proceeds on sales	$	1,206.3	$	2,261.4
Gross gains	10.6		77.4
Gross losses	16.4		10.9

Intent related impairment

Available-for-sale Securities Including Securities Pledged [Line Items]

Other than Temporary Impairment, Credit Losses Recognized in Earnings

The following tables summarize these intent impairments, which are also recognized in earnings, by type for the periods indicated:

	Three Months Ended September 30,
	2013				2012
	Impairment			No. of Securities	Impairment		No. of Securities
U.S. corporate	$	—		—	$	—	—
Foreign(1)	—			—	—		—
Residential mortgage-backed	—		*	2	—		—
Commercial mortgage-backed	0.1			1	—		—
Other asset-backed	—			—	—		—
Total	$	0.1		3	$	—	—
(1) Primarily U.S. dollar denominated.
* Less than $0.1.
	Nine Months Ended September 30,
	2013				2012
	Impairment			No. of Securities	Impairment		No. of Securities
U.S. corporate	$	—		—	$	0.2	1
Foreign(1)	—			—	0.8		3
Residential mortgage-backed	—		*	2	—		—
Commercial mortgage-backed	0.2			3	—		—
Other asset-backed	—			—	0.1		1
Total	$	0.2		5	$	1.1	5
(1) Primarily U.S. dollar denominated.
* Less than $0.1.

Credit related impairment

Available-for-sale Securities Including Securities Pledged [Line Items]

Other than Temporary Impairment, Credit Losses Recognized in Earnings

The following tables identify the amount of credit impairments on fixed maturities for which a portion of the OTTI loss was recognized in Other comprehensive income (loss) and the corresponding changes in such amounts for the periods indicated:

	Three Months Ended September 30,
	2013			2012
Balance at July 1	$	20.2		$	20.0
Additional credit impairments:
On securities not previously impaired	0.3			—
On securities previously impaired	0.4			3.1
Reductions:
Securities intent impaired	—			—
Securities sold, matured, prepaid or paid down	(1.1		)	(2.5		)
Balance at September 30	$	19.8		$	20.6
	Nine Months Ended September 30,
	2013			2012
Balance at January 1	$	20.0		$	19.5
Additional credit impairments:
On securities not previously impaired	1.1			0.1
On securities previously impaired	1.4			4.8
Reductions:
Securities intent impaired	—			—
Securities sold, matured, prepaid or paid down	(2.7		)	(3.8		)
Balance at September 30	$	19.8		$	20.6

Duration

Available-for-sale Securities Including Securities Pledged [Line Items]

Schedule of Unrealized Loss on Investments

Unrealized capital losses (including noncredit impairments) in fixed maturities, including securities pledged, for instances in which fair value declined below amortized cost by greater than or less than 20% for consecutive months as indicated in the tables below, were as follows as of the dates indicated:

	Amortized Cost				Unrealized Capital Losses				Number of Securities
	< 20%		> 20%		< 20%		> 20%		< 20%	> 20%
September 30, 2013
Six months or less below amortized cost	$	5,193.1	$	66.7	$	279.3	$	15.5	702	14
More than six months and twelve months or less below amortized cost	503.6		1.1		46.5		0.4		84	2
More than twelve months below amortized cost	166.7		23.4		12.8		5.9		102	9
Total	$	5,863.4	$	91.2	$	338.6	$	21.8	888	25
December 31, 2012
Six months or less below amortized cost	$	1,110.8	$	15.2	$	19.3	$	3.9	141	10
More than six months and twelve months or less below amortized cost	49.5		1.5		2.6		0.4		31	2
More than twelve months below amortized cost	198.1		61.6		6.2		20.6		99	28
Total	$	1,358.4	$	78.3	$	28.1	$	24.9	271	40

Market Sector (Type of Security)

Available-for-sale Securities Including Securities Pledged [Line Items]

Schedule of Unrealized Loss on Investments

Unrealized capital losses (including noncredit impairments) in fixed maturities, including securities pledged, by market sector for instances in which fair value declined below amortized cost by greater than or less than 20% were as follows as of the dates indicated:

	Amortized Cost				Unrealized Capital Losses				Number of Securities
	< 20%		> 20%		< 20%		> 20%		< 20%	> 20%
September 30, 2013
U.S. Treasuries	$	146.9	$	—	$	2.4	$	—	3	—
U.S. corporate, state and municipalities	3,641.8		35.7		217.1		8.8		478	5
Foreign	1,546.0		39.4		98.5		8.6		220	6
Residential mortgage-backed	436.8		11.6		18.2		3.1		157	10
Commercial mortgage-backed	3.9		—		—		—		3	—
Other asset-backed	88.0		4.5		2.4		1.3		27	4
Total	$	5,863.4	$	91.2	$	338.6	$	21.8	888	25
December 31, 2012
U.S. Treasuries	$	300.5	$	—	$	0.5	$	—	2	—
U.S. corporate, state and municipalities	558.1		4.7		9.1		2.0		82	2
Foreign	242.7		36.0		5.7		10.7		38	8
Residential mortgage-backed	201.2		25.2		10.2		7.9		124	24
Commercial mortgage-backed	11.8		—		0.2		—		8	—
Other asset-backed	44.1		12.4		2.4		4.3		17	6
Total	$	1,358.4	$	78.3	$	28.1	$	24.9	271	40