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Short- Duration Insurance Contracts - Narrative (Details) - USD ($) | 3 Months Ended
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Mar. 31, 2025 | Mar. 31, 2024
Property & Casualty |  |
Net Amount at Risk by Product and Guarantee [Line Items] |  |
Increase (decrease) in estimated reserves for claims occurring in prior periods | $ (5,300,000) | $ 0
Favorable (unfavorable) development of total reserves for claims occurring in prior years | 5,300,000 | 0
Group Benefits |  |
Net Amount at Risk by Product and Guarantee [Line Items] |  |
Increase (decrease) in estimated reserves for claims occurring in prior periods | 400,000 | $ (6,100,000)
Favorable (unfavorable) development of total reserves for claims occurring in prior years | $ (400,000) |

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