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Deferred Acquisition Costs and Other Actuarial Balances - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
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Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Long-duration and short-duration insurance |  |  |  |
Deferred Acquisition Costs |  |  |  |
Amortization of deferred acquisition costs | $ 98.7 | $ 97.3 | $ 197.2 | $ 194.6

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