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Deferred Policy Acquisition Costs (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward] |  |  |
Balance at the beginning of the period | $ 319.0 | $ 290.8 |
Acquisition costs deferred | 357.4 | 460.0 |
Amortization of deferred acquisition costs | (380.2) | (431.8) | $ (414.1)
Balance at the end of the period | $ 296.2 | $ 319.0 | $ 290.8

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