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Investments - Narrative (Details) - USD ($) | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2019 | Jun. 30, 2019 | Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items] |  |  |
Other Receivables | $ 217,100,000 |  | $ 245,400,000
Mortgage- and Asset-backed Securities Not Due at a Single Maturity Date | 1,189,600,000 |  |
Debt securities, available-for-sale, continuous unrealized loss position, less than twelve months, securities that have had recognized credit losses in earnings, aggregate losses | 200,000 |  | 0
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer, securities that have had recognized credit losses in earnings, aggregate losses | 0 |  | 0
Equity Securities at Fair Value | 928,700,000 |  | 684,400,000
Equity securities, FV-NI, unrealized gain (loss) | 98,300,000 |  |
Equity securities without readily determinable fair value, impairment loss, annual amount | 100,000 |  |
Equity securities without readily determinable fair value, downward price adjustment, cumulative amount | 200,000 |  |
Equity securities without readily determinable fair value, upward price adjustment, cumulative amount | 0 |  |
Equity securities without readily determinable fair value, impairment loss, cumulative amount | 5,000,000.0 |  |
Equity Method Limited Liability Investments at Cost Plus Cumulative Undistributed Earnings | 213,400,000 |  | 187,000,000.0
Outstanding commitments to fund equity method limited liability investments | 94,300,000 |  |
Investments in Fixed Maturities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Other liabilities | 50,300,000 |  | 10,500,000
Other Receivables |  | $ 2,300,000 | 500,000
Debt securities, available-for-sale, unrealized loss position, accumulated loss | 21,600,000 |  | 86,600,000
12 Months or Longer | 11,900,000 |  | 22,000,000.0
Government National Mortgage Association Certificates and Obligations (GNMA) |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Mortgage- and Asset-backed Securities Not Due at a Single Maturity Date | 591,500,000 |  |
Federal National Mortgage Association Certificates and Obligations (FNMA) |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Mortgage- and Asset-backed Securities Not Due at a Single Maturity Date | 7,500,000 |  |
Federal Home Loan Mortgage Corporation Certificates and Obligations (FHLMC) |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Mortgage- and Asset-backed Securities Not Due at a Single Maturity Date | 12,500,000 |  |
Other Non-Governmental Issuers |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Mortgage- and Asset-backed Securities Not Due at a Single Maturity Date | 578,100,000 |  |
Equity Securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Other liabilities | 0 |  | 0
Other Receivables | 0 |  | 0
Investment-grade | Investments in Fixed Maturities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Debt securities, available-for-sale, unrealized loss position, accumulated loss | 6,500,000 |  | 69,500,000
Non-investment-grade | Investments in Fixed Maturities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Debt securities, available-for-sale, unrealized loss position, accumulated loss | $ 15,100,000 |  | $ 17,100,000
Percentage of unrealized loss position to amortized cost basis of available for sale security average | 6.00% |  | 5.00%

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