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Investments - Narrative (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other receivables | $ 222,400,000 |  |  |  | $ 219,700,000 |  |  |  | $ 222,400,000 | $ 219,700,000 |
Mortgage- and Asset-backed Securities Not Due at a Single Maturity Date | 1,424,000,000.0 |  |  |  |  |  |  |  | 1,424,000,000.0 |  |
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 |  |  |  |  | 300,000 |
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 |
Equity securities, FV-NI, unrealized gain (loss) |  |  |  |  |  |  |  |  | 136,600,000 |  |
Decrease in carrying value due to observable transactions |  |  |  |  |  |  |  |  | 500,000 |  |
Debt and equity securities, realized gain (loss), excluding other-than-temporary impairment |  |  |  |  |  |  |  |  | 2,900,000 |  |
Cumulative increases in the carrying value due to observable transactions | 0 |  |  |  |  |  |  |  | 0 |  |
Cumulative decreases in the carrying value due to observable transactions | 0 |  |  |  |  |  |  |  | 0 |  |
Debt and equity securities, gain (loss), excluding other-than-temporary impairment loss | 5,800,000 |  |  |  |  |  |  |  | 5,800,000 |  |
Total Assets | 14,341,900,000 |  |  |  | 12,989,100,000 |  |  |  | 14,341,900,000 | 12,989,100,000 |
Liabilities | 9,778,500,000 |  |  |  | 9,016,800,000 |  |  |  | 9,778,500,000 | 9,016,800,000 |
Net Income | 97,500,000 | $ 122,300,000 | $ 126,100,000 | $ 64,000,000.0 | 124,700,000 | $ 129,000,000.0 | $ 122,100,000 | $ 155,300,000 | 409,900,000 | 531,100,000 | $ 190,100,000
Equity Method Limited Liability Investments at Cost Plus Cumulative Undistributed Earnings | 225,300,000 |  |  |  | 220,400,000 |  |  |  | 225,300,000 | 220,400,000 |
Outstanding commitments to fund equity method limited liability investments | 172,800,000 |  |  |  |  |  |  |  | 172,800,000 |  |
Equity Method Investment, Nonconsolidated Investee or Group of Investees |  |  |  |  |  |  |  |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total Assets | 3,554,500,000 |  |  |  | 2,368,100,000 |  |  |  | 3,554,500,000 | 2,368,100,000 | 2,805,300,000
Liabilities | 1,602,500,000 |  |  |  | 817,200,000 |  |  |  | 1,602,500,000 | 817,200,000 | 1,030,700,000
Net Income |  |  |  |  |  |  |  |  | 74,900,000 | 78,000,000.0 | $ 130,400,000
Investments in Fixed Maturities |  |  |  |  |  |  |  |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other receivables | 5,100,000 |  |  |  | 1,000,000.0 |  |  |  | 5,100,000 | 1,000,000.0 |
Other liabilities | 4,300,000 |  |  |  | 19,500,000 |  |  |  | 4,300,000 | 19,500,000 |
Debt securities, available-for-sale, unrealized loss position, accumulated loss | 31,700,000 |  |  |  | 20,800,000 |  |  |  | 31,700,000 | 20,800,000 |
Unrealized loss position for 12 months or longer | 20,000,000.0 |  |  |  | 13,300,000 |  |  |  | 20,000,000.0 | 13,300,000 |
Government National Mortgage Association Certificates and Obligations (GNMA) |  |  |  |  |  |  |  |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |  |  |  |  |  |  |  |
Mortgage- and Asset-backed Securities Not Due at a Single Maturity Date | 413,800,000 |  |  |  |  |  |  |  | 413,800,000 |  |
Federal National Mortgage Association Certificates and Obligations (FNMA) |  |  |  |  |  |  |  |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |  |  |  |  |  |  |  |
Mortgage- and Asset-backed Securities Not Due at a Single Maturity Date | 5,200,000 |  |  |  |  |  |  |  | 5,200,000 |  |
Federal Home Loan Mortgage Corporation Certificates and Obligations (FHLMC) |  |  |  |  |  |  |  |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |  |  |  |  |  |  |  |
Mortgage- and Asset-backed Securities Not Due at a Single Maturity Date | 12,000,000.0 |  |  |  |  |  |  |  | 12,000,000.0 |  |
Other Non-Governmental Issuers |  |  |  |  |  |  |  |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |  |  |  |  |  |  |  |
Mortgage- and Asset-backed Securities Not Due at a Single Maturity Date | 993,000,000.0 |  |  |  |  |  |  |  | 993,000,000.0 |  |
Investment-grade | Investments in Fixed Maturities |  |  |  |  |  |  |  |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt securities, available-for-sale, unrealized loss position, accumulated loss | 8,000,000.0 |  |  |  | 9,100,000 |  |  |  | 8,000,000.0 | 9,100,000 |
Non-investment-grade | Investments in Fixed Maturities |  |  |  |  |  |  |  |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt securities, available-for-sale, unrealized loss position, accumulated loss | $ 23,700,000 |  |  |  | $ 11,700,000 |  |  |  | $ 23,700,000 | $ 11,700,000 |
Percentage of unrealized loss position to amortized cost basis of available for sale security average | 11.00% |  |  |  | 5.00% |  |  |  | 11.00% | 5.00% |

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