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Investments - Narrative (Details) - USD ($) | 9 Months Ended |
--- | --- | ---
Sep. 30, 2018 | Dec. 31, 2017
Debt Securities, Available-for-sale [Line Items] |  |
Equity Securities, FV-NI, Realized Gain (Loss) | $ 12,400,000 |
Other Receivables | 243,100,000 | $ 194,300,000
Mortgage- and Asset-backed Securities Not Due at a Single Maturity Date | 1,128,700,000 |
Mortgage- and Asset-backed Securities Not Due at a Single Maturity Date | 1,115,700,000 |
Other Liabilities | 698,800,000 | 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 | 0 | 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 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less Than 12 Months | 2,534,800,000 | 482,900,000
Total | $ 86,500,000 | $ 19,500,000
12 Months or Longer | 18,100,000 | 13,900,000
Other Receivables | 16,900,000 |
Other Liabilities | 105,800,000 | 5,400,000
Less Than 12 Months | 68,400,000 | 5,600,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 358,800,000 | 438,900,000
12 Months or Longer | 18,100,000 | 13,900,000
Debt Securities, Available-for-sale, Unrealized Loss Position | 2,893,600,000 | 921,800,000
Total | $ 86,500,000 | $ 19,500,000
U.S. Government and Government Agencies and Authorities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less Than 12 Months | 594,000,000 | 140,000,000
Less Than 12 Months | $ 20,000,000 | $ 1,100,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 56,500,000 | 103,400,000
12 Months or Longer | 8,400,000 | 5,100,000
Debt Securities, Available-for-sale, Unrealized Loss Position | 650,500,000 | 243,400,000
Total | 28,400,000 | 6,200,000
Government National Mortgage Association Certificates and Obligations (GNMA) [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Mortgage- and Asset-backed Securities Not Due at a Single Maturity Date | 615,600,000 |
Federal National Mortgage Association Certificates and Obligations (FNMA) [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Mortgage- and Asset-backed Securities Not Due at a Single Maturity Date | 8,900,000 |
Federal Home Loan Mortgage Corporation Certificates and Obligations (FHLMC) [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Mortgage- and Asset-backed Securities Not Due at a Single Maturity Date | 3,200,000 |
Other Non-Governmental Issuers [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Mortgage- and Asset-backed Securities Not Due at a Single Maturity Date | 488,000,000 |
Equity Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Other Receivables | 0 | 0
Other Liabilities |  | 0
External Credit Rating, Investment Grade [Member] | Investments in Fixed Maturities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total | (77,300,000) | 12,600,000
External Credit Rating, Non Investment Grade [Member] | Investments in Fixed Maturities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total | $ (9,200,000) | $ 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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