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Investments - Amortized Cost and Estimated Fair Value of investments (Details) - USD ($) | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | $ 5,021,600,000 | $ 4,846,800,000
Gross Unrealized Gains | 380,600,000 | 324,600,000
Gross Unrealized Losses | (19,500,000) | (46,500,000)
Fair Value | 5,382,700,000 | 5,124,900,000
Accrued Expenses and Other Liabilities | 453,700,000 | 453,200,000
Other Receivables | 194,300,000 | 198,600,000
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
Equity Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Accrued Expenses and Other Liabilities | 0 |
Other Receivables | 0 | 200,000
Investments in Fixed Maturities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Accrued Expenses and Other Liabilities | 5,400,000 | 100,000
Other Receivables | 0 | 2,700,000
US Government and Government Agencies and Authorities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 542,700,000 | 321,200,000
Gross Unrealized Gains | 19,600,000 | 22,300,000
Gross Unrealized Losses | (6,200,000) | (7,200,000)
Fair Value | 556,100,000 | 336,300,000
States and Political Subdivisions [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 1,595,500,000 | 1,640,600,000
Gross Unrealized Gains | 108,600,000 | 88,400,000
Gross Unrealized Losses | (2,300,000) | (14,100,000)
Fair Value | 1,701,800,000 | 1,714,900,000
Foreign Government Debt Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 3,000,000 | 3,500,000
Gross Unrealized Gains | 200,000 | 0
Gross Unrealized Losses | 0 | (100,000)
Fair Value | 3,200,000 | 3,400,000
Corporate Bonds and Notes [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 2,745,800,000 | 2,758,900,000
Gross Unrealized Gains | 245,800,000 | 209,900,000
Gross Unrealized Losses | (11,000,000) | (24,000,000)
Fair Value | 2,980,600,000 | 2,944,800,000
Redeemable Preferred Stocks [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 100,000 | 500,000
Gross Unrealized Gains | 0 | 100,000
Gross Unrealized Losses | 0 | 0
Fair Value | 100,000 | 600,000
Collateralized Loan Obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 134,100,000 | 121,200,000
Gross Unrealized Gains | 5,700,000 | 2,700,000
Gross Unrealized Losses | 0 | (1,100,000)
Fair Value | 139,800,000 | 122,800,000
Other Mortgage and Asset-backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 400,000 | 900,000
Gross Unrealized Gains | 700,000 | 1,200,000
Gross Unrealized Losses | 0 | 0
Fair Value | 1,100,000 | 2,100,000
Collateralized Debt Obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value |  | 900,000
Non-governmental Residential Mortgage-backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value | $ 1,100,000 | $ 1,200,000

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