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Investments - Amortized Cost and Estimated Fair Value of investments (Details) - USD ($) | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | $ 4,560,700,000 | $ 4,341,700,000
Gross Unrealized Gains | 341,600,000 | 455,600,000
Gross Unrealized Losses | (50,000,000) | (19,700,000)
Fair Value | 4,852,300,000 | 4,777,600,000
Accrued Expenses and Other Liabilities | 472,400,000 | 409,600,000
Other Receivables | 193,200,000 | 187,000,000
Available-for-sale-Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Securities that have had Recognized Credit Losses in Earnings, Aggregate Losses | 0 | 0
Investments in Fixed Maturities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Accrued Expenses and Other Liabilities | 5,600,000 | 0
Other Receivables |  | 0
US Government and Government Agencies and Authorities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 298,000,000 | 315,200,000
Gross Unrealized Gains | 26,200,000 | 32,300,000
Gross Unrealized Losses | (3,600,000) | (2,000,000)
Fair Value | 320,600,000 | 345,500,000
States and Political Subdivisions [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 1,513,700,000 | 1,352,500,000
Gross Unrealized Gains | 111,600,000 | 126,400,000
Gross Unrealized Losses | (2,700,000) | (1,800,000)
Fair Value | 1,622,600,000 | 1,477,100,000
Corporate Bonds and Notes [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 2,651,500,000 | 2,599,300,000
Gross Unrealized Gains | 202,000,000 | 294,300,000
Gross Unrealized Losses | (40,700,000) | (15,100,000)
Fair Value | 2,812,800,000 | 2,878,500,000
Redeemable Preferred Stocks [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 3,700,000 | 5,900,000
Gross Unrealized Gains | 100,000 | 800,000
Gross Unrealized Losses | 0 | 0
Fair Value | 3,800,000 | 6,700,000
Collateralized Loan Obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 90,000,000 | 64,900,000
Gross Unrealized Gains | 300,000 | 300,000
Gross Unrealized Losses | (3,000,000) | (800,000)
Fair Value | 87,300,000 | 64,400,000
Other Mortgage and Asset-backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 3,800,000 | 3,900,000
Gross Unrealized Gains | 1,400,000 | 1,500,000
Gross Unrealized Losses | 0 | 0
Fair Value | 5,200,000 | 5,400,000
Collateralized Debt Obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value | 3,800,000 | 3,900,000
Non-governmental Residential Mortgage-backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value | 1,300,000 | 1,300,000
Other Asset Backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value | $ 100,000 | $ 200,000

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