Investments (Tables)

6 Months Ended

Jun. 30, 2014

Schedule of Available-for-sale Securities [Line Items]

Investments Classified by Contractual Maturity Date [Table Text Block]

The amortized cost and estimated fair values of the Company’s Investments in Fixed Maturities at June 30, 2014 by contractual maturity were:

(Dollars in Millions)	Amortized Cost		Fair Value
Due in One Year or Less	$	48.2	$	49.1
Due after One Year to Five Years	770.5		824.5
Due after Five Years to Ten Years	1,290.9		1,349.1
Due after Ten Years	1,986.6		2,246.1
Asset-backed Securities Not Due at a Single Maturity Date	198.6		211.2
Investments in Fixed Maturities	$	4,294.8	$	4,680.0

Schedule of Unrealized Loss on Investments [Table Text Block]

An aging of unrealized losses on the Company’s Investments in Fixed Maturities and Equity Securities at December 31, 2013 is presented below.

	Less Than 12 Months					12 Months or Longer					Total
(Dollars in Millions)	Fair Value		Unrealized Losses			Fair Value		Unrealized Losses			Fair Value		Unrealized Losses
Fixed Maturities:
U.S. Government and Government Agencies and Authorities	$	95.8	$	(10.9	)	$	4.4	$	(0.8	)	$	100.2	$	(11.7	)
States and Political Subdivisions	222.9		(20.1		)	2.0		(0.1		)	224.9		(20.2		)
Corporate Securities:
Bonds and Notes	699.8		(39.4		)	103.2		(8.3		)	803.0		(47.7		)
Other Mortgage and Asset-backed	13.9		(0.1		)	1.1		—			15.0		(0.1		)
Total Fixed Maturities	1,032.4		(70.5		)	110.7		(9.2		)	1,143.1		(79.7		)
Equity Securities:
Preferred Stocks:
Finance, Insurance and Real Estate	22.5		(2.5		)	2.5		—			25.0		(2.5		)
Other Industries	4.3		(0.1		)	0.7		—			5.0		(0.1		)
Common Stocks:
Manufacturing	5.0		(0.1		)	0.2		—			5.2		(0.1		)
Other Industries	14.2		(0.9		)	0.5		—			14.7		(0.9		)
Other Equity Interests:
Exchange Traded Funds	67.6		(1.0		)	—		—			67.6		(1.0		)
Limited Liability Companies and Limited Partnerships	53.1		(0.9		)	5.0		(0.7		)	58.1		(1.6		)
Total Equity Securities	166.7		(5.5		)	8.9		(0.7		)	175.6		(6.2		)
Total	$	1,199.1	$	(76.0	)	$	119.6	$	(9.9	)	$	1,318.7	$	(85.9	)

An aging of unrealized losses on the Company’s Investments in Fixed Maturities and Equity Securities at June 30, 2014 is presented below.

	Less Than 12 Months					12 Months or Longer					Total
(Dollars in Millions)	Fair Value		Unrealized Losses			Fair Value		Unrealized Losses			Fair Value		Unrealized Losses
Fixed Maturities:
U.S. Government and Government Agencies and Authorities	$	24.1	$	(1.5	)	$	65.4	$	(4.5	)	$	89.5	$	(6.0	)
States and Political Subdivisions	31.0		(0.4		)	181.0		(5.5		)	212.0		(5.9		)
Corporate Securities:
Bonds and Notes	104.1		(0.9		)	500.6		(14.4		)	604.7		(15.3		)
Collateralized Loan Obligations	13.1		(0.1		)	2.3		(0.1		)	15.4		(0.2		)
Other Mortgage and Asset-backed	—		—			0.7		—			0.7		—
Total Fixed Maturities	172.3		(2.9		)	750.0		(24.5		)	922.3		(27.4		)
Equity Securities:
Preferred Stocks:
Finance, Insurance and Real Estate	—		—			12.2		(0.8		)	12.2		(0.8		)
Other Industries	4.3		(0.1		)	0.7		—			5.0		(0.1		)
Common Stocks:
Manufacturing	10.8		(0.2		)	0.3		—			11.1		(0.2		)
Other Industries	13.3		(0.7		)	—		—			13.3		(0.7		)
Other Equity Interests:
Exchange Traded Funds	—		—			14.9		(0.1		)	14.9		(0.1		)
Limited Liability Companies and Limited Partnerships	50.4		(1.8		)	2.8		(0.4		)	53.2		(2.2		)
Total Equity Securities	78.8		(2.8		)	30.9		(1.3		)	109.7		(4.1		)
Total	$	251.1	$	(5.7	)	$	780.9	$	(25.8	)	$	1,032.0	$	(31.5	)

Other than Temporary Impairment, Credit Losses Recognized in Earnings [Table Text Block]

The following table sets forth the pre-tax amount of other-than-temporary-impairment (“OTTI”) credit losses, recognized in Retained Earnings for Investments in Fixed Maturities held by the Company as of the dates indicated, for which a portion of the OTTI loss has been recognized in Accumulated Other Comprehensive Income, and the corresponding changes in such amounts.

	Six Months Ended					Three Months Ended
(Dollars in Millions)	Jun 30, 2014		Jun 30, 2013			Jun 30, 2014		Jun 30, 2013
Balance at Beginning of Period	$	9.9	$	4.6		$	10.2	$	4.1
Additions for Previously Unrecognized OTTI Credit Losses	2.4		1.0			2.4		0.3
Increases to Previously Recognized OTTI Credit Losses	0.6		—			0.3		—
Reductions for Change in Impairment Status:
From Status of Credit Loss to Status of Intent-to-sell or Required-to-sell	—		(1.1		)	—		—
Reductions for Investments Sold During Period	—		(0.1		)	—		—
Balance at End of Period	$	12.9	$	4.4		$	12.9	$	4.4

Schedule of Other Investments [Table Text Block]

The carrying values of the Company’s Other Investments at June 30, 2014 and December 31, 2013 were:

(Dollars in Millions)	Jun 30, 2014		Dec 31, 2013
Loans to Policyholders at Unpaid Principal	$	277.8	$	275.4
Real Estate at Depreciated Cost	165.0		167.1
Trading Securities at Fair Value	5.1		5.0
Other	0.4		0.5
Total	$	448.3	$	448.0

Fixed Maturities [Member]

Schedule of Available-for-sale Securities [Line Items]

Schedule of Available-for-sale Securities Reconciliation [Table Text Block]

The amortized cost and estimated fair values of the Company’s Investments in Fixed Maturities at June 30, 2014 were:

	Amortized Cost		Gross Unrealized					Fair Value
(Dollars in Millions)			Gains		Losses
U.S. Government and Government Agencies and Authorities	$	332.4	$	28.9	$	(6.0	)	$	355.3
States and Political Subdivisions	1,295.3		99.8		(5.9		)	1,389.2
Corporate Securities:
Bonds and Notes	2,607.6		281.1		(15.3		)	2,873.4
Redeemable Preferred Stocks	6.4		0.7		—			7.1
Collateralized Loan Obligations	49.1		0.6		(0.2		)	49.5
Other Mortgage and Asset-backed	4.0		1.5		—			5.5
Investments in Fixed Maturities	$	4,294.8	$	412.6	$	(27.4	)	$	4,680.0

The amortized cost and estimated fair values of the Company’s Investments in Fixed Maturities at December 31, 2013 were:

	Amortized Cost		Gross Unrealized					Fair Value
(Dollars in Millions)			Gains		Losses
U.S. Government and Government Agencies and Authorities	$	351.1	$	22.8	$	(11.7	)	$	362.2
States and Political Subdivisions	1,327.4		53.8		(20.2		)	1,361.0
Corporate Securities:
Bonds and Notes	2,636.4		205.0		(47.7		)	2,793.7
Redeemable Preferred Stocks	6.6		0.8		—			7.4
Collateralized Loan Obligations	44.2		0.5		—			44.7
Other Mortgage and Asset-backed	4.8		1.3		(0.1		)	6.0
Investments in Fixed Maturities	$	4,370.5	$	284.2	$	(79.7	)	$	4,575.0

Equity Securities [Member]

Schedule of Available-for-sale Securities [Line Items]

Schedule of Available-for-sale Securities Reconciliation [Table Text Block]

Gross unrealized gains and gross unrealized losses on the Company’s Investments in Equity Securities at June 30, 2014 were:

			Gross Unrealized
(Dollars in Millions)	Cost		Gains		Losses			Fair Value
Preferred Stocks:
Finance, Insurance and Real Estate	$	85.4	$	5.5	$	(0.8	)	$	90.1
Other Industries	21.1		5.5		(0.1		)	26.5
Common Stocks:
Manufacturing	83.4		26.6		(0.2		)	109.8
Other Industries	71.8		23.4		(0.7		)	94.5
Other Equity Interests:
Exchange Traded Funds	119.0		12.0		(0.1		)	130.9
Limited Liability Companies and Limited Partnerships	160.3		36.3		(2.2		)	194.4
Investments in Equity Securities	$	541.0	$	109.3	$	(4.1	)	$	646.2

Gross unrealized gains and gross unrealized losses on the Company’s Investments in Equity Securities at December 31, 2013 were:

			Gross Unrealized
(Dollars in Millions)	Cost		Gains		Losses			Fair Value
Preferred Stocks:
Finance, Insurance and Real Estate	$	85.4	$	2.9	$	(2.5	)	$	85.8
Other Industries	20.1		4.4		(0.1		)	24.4
Common Stocks:
Manufacturing	83.4		21.3		(0.1		)	104.6
Other Industries	68.8		17.0		(0.9		)	84.9
Other Equity Interests:
Exchange Traded Funds	122.0		3.9		(1.0		)	124.9
Limited Liability Companies and Limited Partnerships	150.3		25.2		(1.6		)	173.9
Investments in Equity Securities	$	530.0	$	74.7	$	(6.2	)	$	598.5