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Catastrophe Reinsurance - Catastrophe Reinsurance Premiums (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Liability for Catastrophe Claims [Line Items] |  |  |
Ceded earned premiums | $ 33.1 | $ 32.7 | $ 42.7
Catastrophe Reinsurance |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Ceded earned premiums | 16.4 | 16.3 | 32.0
Operating Segments | Specialty Property & Casualty Insurance | Catastrophe Reinsurance |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Ceded earned premiums | 6.5 | 6.1 | 8.9
Operating Segments | Life Insurance | Catastrophe Reinsurance |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Ceded earned premiums | 0.3 | 0.7 | 0.6
Non-Core Operations | Catastrophe Reinsurance |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Ceded earned premiums | $ 9.6 | $ 9.5 | $ 22.5

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