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Deferred Acquisition Costs and Other Actuarial Balances - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Long-duration and short-duration insurance |  |  |  |
Deferred Acquisition Costs |  |  |  |
Amortization of deferred acquisition costs | $ 103.4 | $ 98.4 | $ 300.6 | $ 293.0

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