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Short- Duration Insurance Contracts - Narrative (Details) - USD ($)
3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Property & Casualty    
Net Amount at Risk by Product and Guarantee [Line Items]    
Favorable (unfavorable) development of total reserves for claims occurring in prior years $ 0 $ 0
Group Benefits    
Net Amount at Risk by Product and Guarantee [Line Items]    
Favorable (unfavorable) development of total reserves for claims occurring in prior years $ 6,100,000 $ 4,900,000