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Investments - Narrative (Details) - USD ($) | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2020 | Jun. 30, 2020 | Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items] |  |  |
Other Receivables | $ 214,000,000.0 |  | $ 219,700,000
Mortgage- and Asset-backed Securities Not Due at a Single Maturity Date | 1,438,800,000 |  |
Debt securities, available-for-sale, continuous unrealized loss position, less than twelve months, securities that have had recognized credit losses in earnings, aggregate losses |  |  | 300,000
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
Fixed maturities, allowance for credit losses | 4,800,000 | $ 5,400,000 | 0
Equity securities | 788,200,000 |  | 907,300,000
Equity securities, FV-NI, unrealized gain (loss) | 76,700,000 |  |
Equity securities without readily determinable fair value, impairment loss, annual amount | 2,000,000.0 |  |
Equity securities without readily determinable fair value, downward price adjustment, cumulative amount | 500,000 |  |
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 | 206,200,000 |  | 220,400,000
Outstanding commitments to fund equity method limited liability investments | 96,500,000 |  |
Investments in Fixed Maturities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Other Receivables | 3,500,000 |  | 1,000,000.0
Other liabilities | 29,800,000 |  | 19,500,000
Debt securities, available-for-sale, unrealized loss position, accumulated loss | 55,200,000 |  | 20,800,000
12 Months or Longer | 26,300,000 |  | 13,300,000
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 | 469,700,000 |  |
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 | 5,700,000 |  |
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 | 950,900,000 |  |
Equity Securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Other Receivables | 0 |  | 0
Other liabilities | 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 | 19,200,000 |  | 9,100,000
Non-investment-grade | Investments in Fixed Maturities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Debt securities, available-for-sale, unrealized loss position, accumulated loss | $ 36,000,000.0 |  | $ 11,700,000
Percentage of unrealized loss position to amortized cost basis of available for sale security average | 11.00% |  | 5.00%

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