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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, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Long-duration and short-duration insurance |  |  |  |
Deferred Acquisition Costs |  |  |  |
Amortization of deferred acquisition costs | $ 97.4 | $ 96.6 | $ 195.3 | $ 192.4

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