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Deferred Acquisition Costs and Other Actuarial Balances - Additional Information (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Deferred Acquisition Costs |  |  |
Amortization of deferred acquisition costs | $ 389.8 | $ 386.9 | $ 373.4
Long-duration and short-duration insurance |  |  |
Deferred Acquisition Costs |  |  |
Amortization of deferred acquisition costs | $ 389.8 | $ 386.9 | $ 373.4

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