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Investments - Narrative (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Debt and Equity Securities, FV-NI [Line Items] |  |  |
Other receivables | $ 219,700,000 | $ 245,400,000 |
Mortgage- and Asset-backed Securities Not Due at a Single Maturity Date | 1,302,300,000 |  |
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) | 0 |
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) | 126,000,000.0 |  |
Decrease in carrying value due to observable transactions | 500,000 |  |
Debt and equity securities, realized gain (loss), excluding other-than-temporary impairment | 100,000 |  |
Cumulative increases in the carrying value due to observable transactions | 0 |  |
Cumulative decreases in the carrying value due to observable transactions | 0 |  |
Debt and equity securities, gain (loss), excluding other-than-temporary impairment loss | 5,000,000.0 |  |
Equity method investment, summarized financial information, assets | 2,368,100,000 | 2,805,300,000 | $ 2,393,700,000
Equity method investment, summarized financial information, liabilities | 817,200,000 | 1,030,700,000 | 899,700,000
Equity method investment, summarized financial information, net income (loss) | 78,000,000.0 | 130,400,000 | $ 209,300,000
Equity Method Limited Liability Investments at Cost Plus Cumulative Undistributed Earnings | 220,400,000 | 187,000,000.0 |
Outstanding commitments to fund equity method limited liability investments | 97,200,000 |  |
Investments in Fixed Maturities |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |
Other receivables | 1,000,000.0 | 500,000 |
Other liabilities | 19,500,000 | 10,500,000 |
Debt securities, available-for-sale, unrealized loss position, accumulated loss | 20,800,000 | 86,600,000 |
Unrealized loss position for 12 months or longer | 13,300,000 | 22,000,000.0 |
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 | 575,900,000 |  |
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 | 7,100,000 |  |
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 | 12,200,000 |  |
Other Non-Governmental Issuers |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |
Mortgage- and Asset-backed Securities Not Due at a Single Maturity Date | 707,100,000 |  |
Investment-grade | Investments in Fixed Maturities |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |
Debt securities, available-for-sale, unrealized loss position, accumulated loss | 9,100,000 | 69,500,000 |
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 | $ 11,700,000 | $ 17,100,000 |
Percentage of unrealized loss position to amortized cost basis of available for sale security average | 5.00% | 5.00% |

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