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Reinsurance - Additional Information (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Sep. 30, 2024
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items] |  |  |  |
Reinsurance Recoverable, Allowance for Credit Loss | $ 3.7 | $ 3.7 | $ 3.3 | $ 11.5
Reinsurance Recoverable, Allowance for Credit Loss, Period Increase (Decrease) | $ 0.0 | $ 0.4 | $ 0.5 |

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