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Short- Duration Insurance Contracts - Narrative (Details) - USD ($) | 3 Months Ended | 6 Months Ended
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Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Property & Casualty |  |  |  |
Net Amount at Risk by Product and Guarantee [Line Items] |  |  |  |
Decrease in estimated reserves for claims occurring in prior years | $ (6,200,000) | $ 0 | $ (6,200,000) | $ 0
Favorable (unfavorable) development of total reserves for claims occurring in prior years | 6,200,000 | 0 | 6,200,000 | 0
Group Benefits |  |  |  |
Net Amount at Risk by Product and Guarantee [Line Items] |  |  |  |
Decrease in estimated reserves for claims occurring in prior years | $ (3,300,000) | $ (3,000,000.0) | (9,400,000) | (7,900,000)
Favorable (unfavorable) development of total reserves for claims occurring in prior years |  |  | $ 9,400,000 | $ 7,900,000

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