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Investments - Estimated Fair Value of Investments in Fixed Maturities (Details) (USD $) | Dec. 31, 2013 | Dec. 31, 2012
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Schedule of Available-for-sale Securities [Line Items] |  |
Gross Unrealized Gains | $ 284,200,000 | $ 584,500,000
Available-for-sale Debt Securities, Gross Unrealized Loss Accumulated in Investments | 79,700,000 | 8,100,000
Other Receivables | 193,100,000 | 206,100,000
Asset-backed Securities Not Due at a Single Maturity Date, Fair Value | 218,300,000 |
Investments in Fixed Maturities, Fair Value | 4,575,000,000 | 4,860,200,000
Accrued Expenses and Other Liabilities | 329,800,000 | 431,400,000
US Government and Government Agencies and Authorities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Gross Unrealized Gains | 22,800,000 | 45,100,000
Available-for-sale Debt Securities, Gross Unrealized Loss Accumulated in Investments | 11,700,000 | 200,000
Investments in Fixed Maturities, Fair Value | 362,200,000 | 428,900,000
Government National Mortgage Association Certificates and Obligations (GNMA) [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Asset-backed Securities Not Due at a Single Maturity Date, Fair Value | 155,900,000 |
Federal National Mortgage Association Certificates and Obligations (FNMA) [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Asset-backed Securities Not Due at a Single Maturity Date, Fair Value | 11,300,000 |
Federal Home Loan Mortgage Corporation Certificates and Obligations (FHLMC) [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Asset-backed Securities Not Due at a Single Maturity Date, Fair Value | 400,000 |
States and Political Subdivisions [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Gross Unrealized Gains | 53,800,000 | 150,500,000
Available-for-sale Debt Securities, Gross Unrealized Loss Accumulated in Investments | 20,200,000 | 100,000
Investments in Fixed Maturities, Fair Value | 1,361,000,000 | 1,401,400,000
Corporate Bonds and Notes [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Gross Unrealized Gains | 205,000,000 | 385,400,000
Available-for-sale Debt Securities, Gross Unrealized Loss Accumulated in Investments | 47,700,000 | 7,500,000
Investments in Fixed Maturities, Fair Value | 2,793,700,000 | 2,993,400,000
Redeemable Preferred Stocks [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Gross Unrealized Gains | 800,000 | 2,500,000
Available-for-sale Debt Securities, Gross Unrealized Loss Accumulated in Investments | 0 | 0
Investments in Fixed Maturities, Fair Value | 7,400,000 | 32,600,000
Mortgage and Asset Backed [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Gross Unrealized Gains | 1,800,000 | 1,000,000
Available-for-sale Debt Securities, Gross Unrealized Loss Accumulated in Investments | 100,000 | 300,000
Investments in Fixed Maturities, Fair Value | 50,700,000 | 3,900,000
Investments in Fixed Maturities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Other Receivables | 2,500,000 | 0
Accrued Expenses and Other Liabilities | $ 0 | $ 1,500,000

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