Investments (Tables)

9 Months Ended

Sep. 30, 2012

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 September 30, 2012 by contractual maturity were:

(Dollars in Millions)	Amortized Cost		Fair Value
Due in One Year or Less	$	49.8	$	49.9
Due after One Year to Five Years	549.1		581.8
Due after Five Years to Ten Years	1,045.6		1,160.7
Due after Ten Years	2,271.1		2,695.9
Asset-backed Securities Not Due at a Single Maturity Date	213.9		237.3
Investments in Fixed Maturities	$	4,129.5	$	4,725.6

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, 2011 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	$	1.3	$	—		$	—	$	—		$	1.3	$	—
States and Political Subdivisions	2.0		—			12.0		(0.8		)	14.0		(0.8		)
Corporate Securities:
Bonds and Notes	169.6		(5.1		)	74.7		(4.3		)	244.3		(9.4		)
Redeemable Preferred Stocks	0.6		(0.1		)	0.1		—			0.7		(0.1		)
Mortgage and Asset-backed	—		—			2.7		(0.8		)	2.7		(0.8		)
Total Fixed Maturities	173.5		(5.2		)	89.5		(5.9		)	263.0		(11.1		)
Equity Securities:
Preferred Stocks:
Finance, Insurance and Real Estate	54.9		(8.1		)	2.2		(0.6		)	57.1		(8.7		)
Other Industries	1.8		—			2.8		(0.1		)	4.6		(0.1		)
Common Stocks:
Manufacturing	1.5		(0.1		)	0.1		—			1.6		(0.1		)
Other Industries	10.7		(1.8		)	—		—			10.7		(1.8		)
Other Equity Interests:
Limited Liability Companies and Limited Partnerships	17.1		(1.5		)	—		—			17.1		(1.5		)
Total Equity Securities	86.0		(11.5		)	5.1		(0.7		)	91.1		(12.2		)
Total	$	259.5	$	(16.7	)	$	94.6	$	(6.6	)	$	354.1	$	(23.3	)

An aging of unrealized losses on the Company’s Investments in Fixed Maturities and Equity Securities at September 30, 2012 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	$	40.0	$	(0.3	)	$	—	$	—		$	40.0	$	(0.3	)
States and Political Subdivisions	—		—			0.7		—			0.7		—
Corporate Securities:
Bonds and Notes	172.3		(3.3		)	40.3		(3.1		)	212.6		(6.4		)
Redeemable Preferred Stocks	—		—			0.7		(0.2		)	0.7		(0.2		)
Mortgage and Asset-backed	0.1		—			2.5		(0.5		)	2.6		(0.5		)
Total Fixed Maturities	212.4		(3.6		)	44.2		(3.8		)	256.6		(7.4		)
Equity Securities:
Preferred Stocks:
Finance, Insurance and Real Estate	—		—			2.3		(0.2		)	2.3		(0.2		)
Other Industries	0.9		—			3.7		(0.1		)	4.6		(0.1		)
Common Stocks:
Manufacturing	2.3		(0.2		)	—		—			2.3		(0.2		)
Other Industries	4.7		(0.3		)	2.8		(0.6		)	7.5		(0.9		)
Other Equity Interests:
Limited Liability Companies and Limited Partnerships	8.0		(0.8		)	11.1		(1.0		)	19.1		(1.8		)
Total Equity Securities	15.9		(1.3		)	19.9		(1.9		)	35.8		(3.2		)
Total	$	228.3	$	(4.9	)	$	64.1	$	(5.7	)	$	292.4	$	(10.6	)

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.

	Nine Months Ended						Three Months Ended
(Dollars in Millions)	Sep 30, 2012			Sep 30, 2011			Sep 30, 2012		Sep 30, 2011
Balance at Beginning of Period	$	3.9		$	2.4		$	3.6	$	2.1
Reductions to Previously Recognized OTTI Credit Losses	(0.1		)	(0.5		)	—		(0.2		)
Reductions for Investments Sold During Period	(0.2		)	—			—		—
Balance at End of Period	$	3.6		$	1.9		$	3.6	$	1.9

Schedule of Other Investments [Table Text Block]

The carrying values of the Company’s Other Investments at September 30, 2012 and December 31, 2011 were:

(Dollars in Millions)	Sep 30, 2012		Dec 31, 2011
Loans to Policyholders at Unpaid Principal	$	262.4	$	253.9
Real Estate at Depreciated Cost	232.6		239.4
Trading Securities at Fair Value	4.5		4.4
Other	0.6		0.6
Total	$	500.1	$	498.3

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 December 31, 2011 were:

	Amortized Cost		Gross Unrealized					Fair Value
(Dollars in Millions)			Gains		Losses
U.S. Government and Government Agencies and Authorities	$	439.4	$	52.3	$	—		$	491.7
States and Political Subdivisions	1,705.0		148.4		(0.8		)	1,852.6
Corporate Securities:
Bonds and Notes	2,040.1		311.6		(9.4		)	2,342.3
Redeemable Preferred Stocks	76.7		5.1		(0.1		)	81.7
Mortgage and Asset-backed	4.9		1.0		(0.8		)	5.1
Investments in Fixed Maturities	$	4,266.1	$	518.4	$	(11.1	)	$	4,773.4

The amortized cost and estimated fair values of the Company’s Investments in Fixed Maturities at September 30, 2012 were:

	Amortized Cost		Gross Unrealized					Fair Value
(Dollars in Millions)			Gains		Losses
U.S. Government and Government Agencies and Authorities	$	406.3	$	50.6	$	(0.3	)	$	456.6
States and Political Subdivisions	1,280.6		155.4		—			1,436.0
Corporate Securities:
Bonds and Notes	2,399.8		393.2		(6.4		)	2,786.6
Redeemable Preferred Stocks	38.6		3.3		(0.2		)	41.7
Mortgage and Asset-backed	4.2		1.0		(0.5		)	4.7
Investments in Fixed Maturities	$	4,129.5	$	603.5	$	(7.4	)	$	4,725.6

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 September 30, 2012 were:

			Gross Unrealized
(Dollars in Millions)	Cost		Gains		Losses			Fair Value
Preferred Stocks:
Finance, Insurance and Real Estate	$	80.4	$	4.5	$	(0.2	)	$	84.7
Other Industries	18.4		3.9		(0.1		)	22.2
Common Stocks:
Manufacturing	66.5		23.9		(0.2		)	90.2
Other Industries	65.0		13.0		(0.9		)	77.1
Other Equity Interests:
Exchange Traded Funds	144.6		7.2		—			151.8
Limited Liability Companies and Limited Partnerships	106.5		15.0		(1.8		)	119.7
Investments in Equity Securities	$	481.4	$	67.5	$	(3.2	)	$	545.7

Gross unrealized gains and gross unrealized losses on the Company’s Investments in Equity Securities at December 31, 2011 were:

			Gross Unrealized
(Dollars in Millions)	Cost		Gains		Losses			Fair Value
Preferred Stocks:
Finance, Insurance and Real Estate	$	94.4	$	1.0	$	(8.7	)	$	86.7
Other Industries	18.0		2.6		(0.1		)	20.5
Common Stocks:
Manufacturing	64.6		18.9		(0.1		)	83.4
Other Industries	41.4		7.4		(1.8		)	47.0
Other Equity Interests:
Exchange Traded Funds	66.0		0.6		—			66.6
Limited Liability Companies and Limited Partnerships	82.9		11.7		(1.5		)	93.1
Investments in Equity Securities	$	367.3	$	42.2	$	(12.2	)	$	397.3