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Investments - Narrative (Details) - USD ($) | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Other Receivables | $ 187,900,000 | $ 194,300,000
Mortgage- and Asset-backed Securities Not Due at a Single Maturity Date | 707,800,000 |
Mortgage- and Asset-backed Securities Not Due at a Single Maturity Date | 707,800,000 |
Other Liabilities | 475,900,000 | 453,700,000
Available-for-sale-Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Securities that have had Recognized Credit Losses in Earnings, Aggregate Losses | 100,000 | 0
Available For Sale Securities, Continuous Unrealized Loss Position, Credit Losses Recognized Related to Securities in An Unrealized Loss Position, In a Position of 12 Months or Longer | 0 | 0
Investments in Fixed Maturities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total | 48,000,000 | 19,500,000
12 Months or Longer | 19,500,000 | 13,900,000
Other Receivables | 4,900,000 | 0
Other Liabilities | 36,100,000 | 5,400,000
U.S. Government and Government Agencies and Authorities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total | 15,900,000 | 6,200,000
12 Months or Longer | 7,800,000 | 5,100,000
Government National Mortgage Association Certificates and Obligations (GNMA) [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Mortgage- and Asset-backed Securities Not Due at a Single Maturity Date | 469,400,000 |
Federal National Mortgage Association Certificates and Obligations (FNMA) [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Mortgage- and Asset-backed Securities Not Due at a Single Maturity Date | 10,100,000 |
Federal Home Loan Mortgage Corporation Certificates and Obligations (FHLMC) [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Mortgage- and Asset-backed Securities Not Due at a Single Maturity Date | 3,600,000 |
Other Non-Governmental Issuers [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Mortgage- and Asset-backed Securities Not Due at a Single Maturity Date | 224,700,000 |
Equity Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Other Receivables | 0 | 0
Other Liabilities | 0 | 0
External Credit Rating, Investment Grade [Member] | Investments in Fixed Maturities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total | (40,000,000) | 12,600,000
External Credit Rating, Non Investment Grade [Member] | Investments in Fixed Maturities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total | $ (8,000,000) | $ 6,900,000
Percentage of Unrealized Loss Position to Amortized Cost Basis of Available for Sale Security Average | 4.00% | 4.00%

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