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Catastrophe Reinsurance - Catastrophe Losses and LAE (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Catastrophe Reinsurance |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Catastrophe Losses and LAE | $ 71.3 | $ 87.6 | $ 75.2
Non-Core Operations | Catastrophe Reinsurance |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Catastrophe Losses and LAE | 48.6 | 52.4 | 48.3
Specialty Property & Casualty Insurance | Operating Segments |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Catastrophe Losses and LAE | 2,541.7 | 3,141.9 | 3,578.2
Specialty Property & Casualty Insurance | Operating Segments | Catastrophe Reinsurance |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Catastrophe Losses and LAE | 20.6 | 32.2 | 23.6
Life Insurance | Operating Segments | Catastrophe Reinsurance |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Catastrophe Losses and LAE | $ 2.1 | $ 3.0 | $ 3.3

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