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Deferred Acquisition Costs and Other Actuarial Balances - Additional Information (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Deferred Acquisition Costs      
Amortization of deferred acquisition costs $ 392.5 $ 389.8 $ 386.9
Long-duration and short-duration insurance      
Deferred Acquisition Costs      
Amortization of deferred acquisition costs $ 392.5 $ 389.8 $ 386.9