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Investments - Amortized Cost and Estimated Fair Value of investments (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]
Investments in Fixed Maturities, Amortized Cost	$ 4,370.5	$ 4,283.8
Gross Unrealized Gains	284.2	584.5
Gross Unrealized Losses	(79.7)	(8.1)
Investments in Fixed Maturities, Fair Value	4,575.0	4,860.2
US Government and Government Agencies and Authorities [Member]
Schedule of Available-for-sale Securities [Line Items]
Investments in Fixed Maturities, Amortized Cost	351.1	384.0
Gross Unrealized Gains	22.8	45.1
Gross Unrealized Losses	(11.7)	(0.2)
Investments in Fixed Maturities, Fair Value	362.2	428.9
States and Political Subdivisions [Member]
Schedule of Available-for-sale Securities [Line Items]
Investments in Fixed Maturities, Amortized Cost	1,327.4	1,251.0
Gross Unrealized Gains	53.8	150.5
Gross Unrealized Losses	(20.2)	(0.1)
Investments in Fixed Maturities, Fair Value	1,361.0	1,401.4
Corporate Bonds and Notes [Member]
Schedule of Available-for-sale Securities [Line Items]
Investments in Fixed Maturities, Amortized Cost	2,636.4	2,615.5
Gross Unrealized Gains	205.0	385.4
Gross Unrealized Losses	(47.7)	(7.5)
Investments in Fixed Maturities, Fair Value	2,793.7	2,993.4
Redeemable Preferred Stocks [Member]
Schedule of Available-for-sale Securities [Line Items]
Investments in Fixed Maturities, Amortized Cost	6.6	30.1
Gross Unrealized Gains	0.8	2.5
Gross Unrealized Losses	0	0
Investments in Fixed Maturities, Fair Value	7.4	32.6
Mortgage and Asset Backed [Member]
Schedule of Available-for-sale Securities [Line Items]
Investments in Fixed Maturities, Amortized Cost	49.0	3.2
Gross Unrealized Gains	1.8	1.0
Gross Unrealized Losses	(0.1)	(0.3)
Investments in Fixed Maturities, Fair Value	50.7	3.9
Collateralized Loan Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Investments in Fixed Maturities, Fair Value	44.7
Collateralized Debt Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Investments in Fixed Maturities, Fair Value	4.6	2.3
Mortgage-backed Securities, Issued by Private Enterprises [Member]
Schedule of Available-for-sale Securities [Line Items]
Investments in Fixed Maturities, Fair Value	1.2	1.3
Other Asset Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Investments in Fixed Maturities, Fair Value	$ 0.2	$ 0.3

X

- Definition

Amount of accumulated pre-tax unrealized gain before deducting pre-tax unrealized loss on investments in available-for-sale debt securities impacting investments.

+ References

No definition available.

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Amount of accumulated pre-tax unrealized loss before deducting pre-tax unrealized gain on investments in available-for-sale debt securities impacting investments.

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This item represents the cost of debt securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

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- Definition

Amount of debt securities categorized neither as held-to-maturity nor trading.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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