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Investments - AFS Securities with Cost Basis in Excess of Fair Value - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Debt Securities, Available-for-Sale [Line Items] |  |  |  |  |
Available-for-sale fixed-maturities with cost basis in excess of fair values, cost basis | $ 1,944.9 |  | $ 1,944.9 |  | $ 2,493.1
Allowance for credit losses | 0.9 |  | 0.9 |  | $ 0.0
Available-for-sale credit (gains) losses | $ 0.9 | $ 0.5 | $ 0.9 | $ 0.5 |

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