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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
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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

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- 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. + Details
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- Definition 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. + References No definition available. + Details
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- Definition Amount of debt securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 2 -Subparagraph (b)-(g) -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62557-112803 + Details
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