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Investments - Available-for-sale Securities with Cost Basis in Excess of Fair Value - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021 | Dec. 31, 2021
Investments Debt And Equity Securities [Abstract] |  |  |  |  |
Available-for-sale fixed-maturities with cost basis in excess of fair values, cost basis | $ 2,500.0 |  | $ 2,500.0 |  | $ 924.4
Available-for-sale credit (gains) losses | $ 0.0 | $ 0.7 | $ (0.1) | $ 0.9 |

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- Definition Available-for-sale fixed-maturities with cost basis in excess of fair values, cost basis. + References No definition available. + Details
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- Definition Debt securities held to maturity allowance for credit loss. + References No definition available. + Details
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- References No definition available. + Details
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