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Investments - Narrative (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Debt and Equity Securities, FV-NI [Line Items] |  |  |
Other receivables | $ 207,300,000 | $ 222,400,000 |
Mortgage- and Asset-backed Securities Not Due at a Single Maturity Date | 1,545,300,000 |  |
Equity securities, FV-NI, unrealized gain (loss) | 111,900,000 |  |
Debt and equity securities, realized gain (loss), excluding other-than-temporary impairment | 4,200,000 |  |
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 | 10,000,000 |  |
Total Assets | 14,916,500,000 | 14,341,900,000 |
Liabilities | 10,908,800,000 | 9,778,500,000 |
Net Income (Loss) | (120,500,000) | 409,900,000 | $ 531,100,000
Outstanding commitments to fund equity method limited liability investments | 198,500,000 |  |
Allowance for credit losses | (7,500,000) | (3,300,000) | 0
Additions for Securities for which No Previous Expected Credit Losses were Recognized | 5,600,000 | 7,100,000 |
Net Increase (Decrease) in Allowance on Securities for which Expected Credit Losses were Previously Recognized | (1,100,000) | (400,000) |
Write-offs Charged Against Allowance | (300,000) | (1,400,000) |
Alternative Energy Partnership Investments |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |
Equity Method Investments | 39,600,000 | 21,300,000 |
Equity Method Investment, Nonconsolidated Investee or Group of Investees |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |
Total Assets | 5,042,500,000 | 3,554,500,000 | 2,368,100,000
Liabilities | 2,074,800,000 | 1,602,500,000 | 817,200,000
Net Income (Loss) | 585,100,000 | 74,900,000 | 78,000,000
Investments in Fixed Maturities |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |
Other receivables | 600,000 | 5,100,000 |
Other liabilities | 12,700,000 | 4,300,000 |
Debt securities, available-for-sale, unrealized loss position, accumulated loss | 32,700,000 | 31,700,000 |
Unrealized loss position for 12 months or longer | 5,900,000 | 20,000,000.0 |
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 | 406,400,000 |  |
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 | 46,800,000 |  |
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 | 32,600,000 |  |
Other Non-Governmental Issuers |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |
Mortgage- and Asset-backed Securities Not Due at a Single Maturity Date | 1,059,500,000 |  |
Foreign Governments |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |
Debt securities, available-for-sale, unrealized loss position, accumulated loss | 1,200,000 | 1,100,000 |
Unrealized loss position for 12 months or longer | 600,000 | 1,000,000.0 |
Allowance for credit losses | 0 | (300,000) | 0
Additions for Securities for which No Previous Expected Credit Losses were Recognized | 0 | 1,200,000 |
Net Increase (Decrease) in Allowance on Securities for which Expected Credit Losses were Previously Recognized | (300,000) | (200,000) |
Write-offs Charged Against Allowance | 0 |  |
Corporate Bonds and Notes |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |
Debt securities, available-for-sale, unrealized loss position, accumulated loss | 16,000,000.0 | 10,600,000 |
Unrealized loss position for 12 months or longer | 2,900,000 | 3,100,000 |
Allowance for credit losses | (7,500,000) | (3,000,000.0) | $ 0
Additions for Securities for which No Previous Expected Credit Losses were Recognized | 5,600,000 | 5,900,000 |
Net Increase (Decrease) in Allowance on Securities for which Expected Credit Losses were Previously Recognized | (800,000) | (200,000) |
Write-offs Charged Against Allowance | (300,000) | (1,400,000) |
Investment-grade | Investments in Fixed Maturities |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |
Debt securities, available-for-sale, unrealized loss position, accumulated loss | 23,700,000 | 8,000,000 |
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 | $ 9,000,000 | $ 23,700,000 |
Percentage of unrealized loss position to amortized cost basis of available for sale security average | 4.00% | 11.00% |

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