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Investments - Narrative (Details) - USD ($) | 6 Months Ended |
--- | --- | ---
Jun. 30, 2018 | Dec. 31, 2017
Debt Securities, Available-for-sale [Line Items] |  |
Equity Securities, FV-NI, Realized Gain (Loss) | $ 1,600,000 |
Other Receivables | 189,200,000 | $ 194,300,000
Mortgage- and Asset-backed Securities Not Due at a Single Maturity Date | 712,600,000 |
Mortgage- and Asset-backed Securities Not Due at a Single Maturity Date | 706,600,000 |
Other Liabilities | 506,800,000 | 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 | 200,000 | 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 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less Than 12 Months | 1,806,700,000 | 482,900,000
Total | $ 66,700,000 | $ 19,500,000
12 Months or Longer | 7,700,000 | 13,900,000
Other Receivables | 0 |
Other Liabilities | 31,800,000 | 5,400,000
Less Than 12 Months | 59,000,000 | 5,600,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 280,800,000 | 438,900,000
12 Months or Longer | 7,700,000 | 13,900,000
Debt Securities, Available-for-sale, Unrealized Loss Position | 2,087,500,000 | 921,800,000
Total | $ 66,700,000 | $ 19,500,000
U.S. Government and Government Agencies and Authorities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less Than 12 Months | 461,900,000 | 140,000,000
Less Than 12 Months | $ 18,800,000 | $ 1,100,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 39,700,000 | 103,400,000
12 Months or Longer | 1,100,000 | 5,100,000
Debt Securities, Available-for-sale, Unrealized Loss Position | 501,600,000 | 243,400,000
Total | 19,900,000 | 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 | 458,800,000 |
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 | 9,500,000 |
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 | 3,400,000 |
Other Non-Governmental Issuers [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Mortgage- and Asset-backed Securities Not Due at a Single Maturity Date | 234,900,000 |
Equity Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Other Receivables | 0 | 0
Other Liabilities | 20,000,000 | 0
External Credit Rating, Investment Grade [Member] | Investments in Fixed Maturities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total | (57,600,000) | 12,600,000
External Credit Rating, Non Investment Grade [Member] | Investments in Fixed Maturities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total | $ (9,100,000) | $ 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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