Investment (Tables)

3 Months Ended

Sep. 30, 2012

Investments

Amortized Costs and Fair Values of Fixed Maturity Securities Available-for-Sale

		September 30, 2012
		Amortized		Unrealized		Unrealized		Fair
		Cost		Gains		Losses		Value
		(In millions)
Corporate bonds		$	5,819.0	$	611.3	$	(2.8)	$	6,427.5
U.S. government and agency bonds			365.6		64.7		0.0		430.3
U.S. state and political subdivision bonds			158.7		17.8		0.0		176.5
Foreign government bonds			61.4		10.9		0.0		72.3
S&P 500 Index options			13.8		0.0		0.0		13.8
	Total fixed maturity securities	$	6,418.5	$	704.7	$	(2.8)	$	7,120.4

		December 31, 2011
		Amortized		Unrealized		Unrealized		Fair
		Cost		Gains		Losses		Value
		(In millions)
Corporate bonds		$	5,588.4	$	491.8	$	(20.9)	$	6,059.3
U.S. government and agency bonds			387.8		64.3		0.0		452.1
U.S. state and political subdivision bonds			164.8		14.0		0.0		178.8
Foreign government bonds			61.7		10.4		0.0		72.1
S&P 500 Index options			7.2		0.0		0.0		7.2
	Total fixed maturity securities	$	6,209.9	$	580.5	$	(20.9)	$	6,769.5

Schedule of Contractual Maturities of Fixed Maturity Securities Available-for-Sale

		September 30, 2012				December 31, 2011
		Amortized		Fair		Amortized		Fair
		Cost		Value		Cost		Value
		(In millions)
Due in one year or less		$	803.0	$	818.6	$	632.7	$	645.0
Due after one year through five years			2,697.1		2,915.8		2,534.6		2,693.6
Due after five years through ten years			2,076.6		2,343.5		2,173.9		2,392.5
Due after ten years			841.8		1,042.5		868.7		1,038.4
	Total fixed maturity securities	$	6,418.5	$	7,120.4	$	6,209.9	$	6,769.5

Schedule of Gross Unrealized Losses and Fair Value of Investments

			September 30, 2012
			Total				Less than 12 months				12 or more months
			Number		Amount		Number		Amount		Number		Amount
			(Dollars in millions)
Unrealized losses:
		Corporate bonds		98	$	2.8		82	$	1.6		16	$	1.2
Fair market value of securities with
	unrealized losses:
		Corporate bonds		98	$	87.0		82	$	71.4		16	$	15.6

			December 31, 2011
			Total				Less than 12 months				12 or more months
			Number		Amount		Number		Amount		Number		Amount
			(Dollars in millions)
Unrealized losses:
		Corporate bonds		360	$	20.9		334	$	17.4		26	$	3.5
Fair market value of securities with
	unrealized losses:
		Corporate bonds		360	$	425.3		334	$	398.0		26	$	27.3

Commercial Mortgage Loan Portfolio by Property Type, by Geographic Region within the U.S. and by U.S. State

			September 30, 2012				December 31, 2011
			Amount		Percent		Amount		Percent
			(Dollars in millions)
Property type:
	Retail		$	2,492.2	48.4	%	$	2,457.8	50.1	%
	Industrial			967.4	18.8			900.4	18.4
	Office			944.7	18.3			911.1	18.6
	Hotel/motel			297.5	5.8			241.9	4.9
	Commercial			199.4	3.9			187.1	3.8
	Apartment and other			247.8	4.8			204.0	4.2
		Total commercial mortgage loans	$	5,149.0	100.0	%	$	4,902.3	100.0	%
Geographic region*:
	Pacific		$	1,811.2	35.2	%	$	1,699.3	34.7	%
	South Atlantic			1,028.9	20.0			953.8	19.5
	West South Central			629.6	12.2			605.3	12.3
	Mountain			609.1	11.8			585.8	11.9
	East North Central			420.3	8.2			393.4	8.0
	Middle Atlantic			241.8	4.7			243.8	5.0
	West North Central			183.9	3.6			184.8	3.8
	East South Central			131.7	2.5			129.9	2.6
	New England			92.5	1.8			106.2	2.2
		Total commercial mortgage loans	$	5,149.0	100.0	%	$	4,902.3	100.0	%
U.S. state:
	California		$	1,418.4	27.5	%	$	1,332.0	27.2	%
	Texas			574.0	11.1			550.8	11.2
	Florida			316.0	6.2			305.3	6.2
	Georgia			304.3	5.9			270.1	5.5
	Other states			2,536.3	49.3			2,444.1	49.9
		Total commercial mortgage loans	$	5,149.0	100.0	%	$	4,902.3	100.0	%

Changes in Commercial Mortgage Loan Loss Allowance

				Three Months Ended				Nine Months Ended
				September 30,				September 30,
				2012		2011		2012		2011
				(In millions)
Commercial mortgage loan loss allowance:
	Beginning balance			$	45.6	$	43.5	$	48.1	$	36.1
		Provision			5.0		7.5		11.4		25.5
		Charge-offs, net			(2.6)		(3.9)		(11.5)		(14.5)
			Ending balance	$	48.0	$	47.1	$	48.0	$	47.1
	Specific loan loss allowance			$	25.0	$	26.8	$	25.0	$	26.8
	General loan loss allowance				23.0		20.3		23.0		20.3
			Total commercial mortgage loan loss allowance	$	48.0	$	47.1	$	48.0	$	47.1

Schedule of Recorded Investment in Commercial Mortgage Loans

		September 30, 2012		December 31, 2011
		(In millions)
Commercial mortgage loans collectively evaluated for impairment		$	5,098.4	$	4,845.7
Commercial mortgage loans individually evaluated for impairment			98.6		104.7
Commercial mortgage loan loss allowance			(48.0)		(48.1)
	Total commercial mortgage loans	$	5,149.0	$	4,902.3

Performing and Nonperforming Commercial Mortgage Loans by Property Type

		September 30, 2012
								Hotel/				Apartment
		Retail		Office		Industrial		Motel		Commercial		and Other		Total
		(In millions)
Performing commercial mortgage loans		$	2,487.5	$	941.5	$	965.5	$	297.5	$	198.8	$	247.8	$	5,138.6
Nonperforming commercial mortgage loans			4.7		3.2		1.9		0.0		0.6		0.0		10.4
	Total commercial mortgage loans	$	2,492.2	$	944.7	$	967.4	$	297.5	$	199.4	$	247.8	$	5,149.0

		December 31, 2011
								Hotel/				Apartment
		Retail		Office		Industrial		Motel		Commercial		and Other		Total
		(In millions)
Performing commercial mortgage loans		$	2,442.3	$	898.4	$	895.2	$	241.9	$	182.0	$	201.3	$	4,861.1
Nonperforming commercial mortgage loans			15.5		12.7		5.2		0.0		5.1		2.7		41.2
	Total commercial mortgage loans	$	2,457.8	$	911.1	$	900.4	$	241.9	$	187.1	$	204.0	$	4,902.3

Impaired Commercial Mortgage Loans Identified in Management's Specific Review of Probable Loan Losses and the Related Allowance

						September 30, 2012
								Unpaid				Amount on
						Recorded		Principal		Related		Nonaccrual
						Investment		Balance		Allowance		Status
						(In millions)
Impaired commercial mortgage loans:
	Without specific loan loss allowances:
		Retail				$	12.5	$	12.5	$	0.0	$	2.9
		Office					6.3		6.3		0.0		5.1
		Industrial					3.3		3.3		0.0		0.0
		Apartment and other					1.9		1.9		0.0		0.0
			Total impaired commercial mortgage loans without specific
				loan loss allowances			24.0		24.0		0.0		8.0
	With specific loan loss allowances:
		Retail					35.7		35.7		13.8		6.3
		Office					11.4		11.4		2.7		1.8
		Industrial					10.8		10.8		3.3		0.9
		Hotel/motel					5.9		5.9		0.4		0.0
		Commercial					7.7		7.7		4.7		3.0
		Apartment and other					3.1		3.1		0.1		0.0
			Total impaired commercial mortgage loans with specific
				loan loss allowances			74.6		74.6		25.0		12.0
					Total impaired commercial mortgage loans	$	98.6	$	98.6	$	25.0	$	20.0

						December 31, 2011
								Unpaid				Amount on
						Recorded		Principal		Related		Nonaccrual
						Investment		Balance		Allowance		Status
						(In millions)
Impaired commercial mortgage loans:
	Without specific loan loss allowances:
		Retail				$	8.6	$	8.6	$	0.0	$	2.1
		Office					5.8		5.8		0.0		4.3
		Industrial					5.8		5.8		0.0		0.9
		Hotel/motel					5.9		5.9		0.0		0.0
		Apartment and other					2.8		2.8		0.0		1.1
			Total impaired commercial mortgage loans without specific
				loan loss allowances			28.9		28.9		0.0		8.4
	With specific loan loss allowances:
		Retail					31.7		31.7		10.7		10.2
		Office					18.3		18.3		5.2		10.1
		Industrial					11.5		11.5		5.0		7.5
		Commercial					11.1		11.1		5.3		11.1
		Apartment and other					3.2		3.2		0.4		1.9
			Total impaired commercial mortgage loans with specific
				loan loss allowances			75.8		75.8		26.6		40.8
					Total impaired commercial mortgage loans	$	104.7	$	104.7	$	26.6	$	49.2

Troubled Debt Restructurings on Financing Receivables [Table Text Block]

			Three Months Ended						Nine Months Ended
			September 30, 2012						September 30, 2012
					Pre-		Post-				Pre-		Post-
					Restructuring		Restructuring				Restructuring		Restructuring
			Number		Recorded		Recorded		Number		Recorded		Recorded
			of Loans		Investment		Investment		of Loans		Investment		Investment
			(Dollars in millions)
Troubled debt restructurings:
	Retail			3	$	2.6	$	3.9		7	$	6.0	$	7.2
	Industrial			0		0.0		0.0		3		2.4		2.4
	Apartment and other			0		0.0		0.0		1		1.8		1.8
		Total troubled debt restructurings		3	$	2.6	$	3.9		11	$	10.2	$	11.4

Troubled Debt Restructurings, Subsequent Defaults [Table Text Block]

			Three Months Ended						Nine Months Ended
			September 30, 2012						September 30, 2012
			Number		Recorded		Number		Recorded
			of Loans		Investment		of Loans		Investment
			(Dollars in millions)
Troubled debt restructurings that subsequently defaulted:
	Retail			0	$	0.0		1	$	0.8
		Total troubled debt restructurings		0	$	0.0		1	$	0.8

Average Recorded Investment in Impaired Commercial Mortgage Loans before Specific Allowances for Losses

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2012		2011		2012		2011
	(In millions)
Average recorded investment	$	99.0	$	91.9	$	101.7	$	89.2

Aging of Commercial Mortgage Loans by Property Type

			September 30, 2012
															Total
							Greater Than				Allowance				Commercial
			30 Days		60 Days		90 Days		Total		Related		Current,		Mortgage
			Past Due		Past Due		Past Due		Past Due		to Past Due		net		Loans
			(In millions)
Commercial mortgage loans:
	Retail		$	11.1	$	0.3	$	7.6	$	19.0	$	(3.2)	$	2,476.4	$	2,492.2
	Office			1.8		0.0		3.7		5.5		(0.5)		939.7		944.7
	Industrial			0.8		1.3		1.3		3.4		(0.8)		964.8		967.4
	Hotel/motel			0.0		0.0		0.0		0.0		0.0		297.5		297.5
	Commercial			0.0		0.0		1.4		1.4		(0.8)		198.8		199.4
	Apartment and other			0.0		0.0		0.0		0.0		0.0		247.8		247.8
		Total commercial mortgage loans	$	13.7	$	1.6	$	14.0	$	29.3	$	(5.3)	$	5,125.0	$	5,149.0

			December 31, 2011
															Total
							Greater Than				Allowance				Commercial
			30 Days		60 Days		90 Days		Total		Related		Current,		Mortgage
			Past Due		Past Due		Past Due		Past Due		to Past Due		net		Loans
			(In millions)
Commercial mortgage loans:
	Retail		$	3.1	$	7.1	$	3.0	$	13.2	$	(1.3)	$	2,445.9	$	2,457.8
	Office			0.8		1.5		1.6		3.9		(0.4)		907.6		911.1
	Industrial			1.4		0.4		2.3		4.1		(0.7)		897.0		900.4
	Hotel/motel			0.0		0.0		0.0		0.0		0.0		241.9		241.9
	Commercial			0.0		0.0		1.2		1.2		(0.8)		186.7		187.1
	Apartment and other			0.2		0.0		0.0		0.2		0.0		203.8		204.0
		Total commercial mortgage loans	$	5.5	$	9.0	$	8.1	$	22.6	$	(3.2)	$	4,882.9	$	4,902.3

Net Investment Income Summarized by Investment Type

					Three Months Ended				Nine Months Ended
					September 30,				September 30,
					2012		2011		2012		2011
Fixed maturity securities:					(In millions)
	Bonds				$	77.8	$	79.2	$	235.2	$	243.1
	S&P 500 Index options					2.9		(6.8)		7.3		(3.0)
		Total fixed maturity securities				80.7		72.4		242.5		240.1
Commercial mortgage loans						87.2		79.6		248.3		229.9
Real estate						0.0		0.1		0.1		0.8
Other						(2.5)		0.7		(3.2)		2.7
			Gross investment income			165.4		152.8		487.7		473.5
Investment expenses						(5.6)		(5.5)		(16.8)		(16.6)
				Net investment income	$	159.8	$	147.3	$	470.9	$	456.9

Schedule of Gross Capital Gains and Losses by Investment Type

				Three Months Ended				Nine Months Ended
				September 30,				September 30,
				2012		2011		2012		2011
				(In millions)
Gains:
	Fixed maturity securities			$	3.5	$	1.3	$	9.3	$	9.4
	Commercial mortgage loans				0.6		0.3		1.2		0.7
	Real estate investments				0.0		19.4		0.0		28.1
	Real estate owned				0.7		0.2		1.0		0.6
	Other				0.0		0.0		0.1		0.0
		Gross capital gains			4.8		21.2		11.6		38.8
Losses:
	Fixed maturity securities				(1.0)		(0.6)		(4.6)		(2.2)
	Provision for commercial mortgage loan losses				(5.0)		(7.5)		(11.4)		(25.5)
	Real estate investments				0.0		0.0		0.0		(0.2)
	Real estate owned				(0.9)		(3.8)		(1.9)		(17.0)
	Other				(0.5)		(1.6)		(0.5)		(1.8)
		Gross capital losses			(7.4)		(13.5)		(18.4)		(46.7)
			Net capital (losses) gains	$	(2.6)	$	7.7	$	(6.8)	$	(7.9)