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Deferred Policy Acquisition Costs (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward] |  |  |
Deferred Policy Acquisition Cost, Beginning Balance | $ 296.2 | $ 319.0 |
Acquisition costs deferred | 446.1 | 357.4 |
Amortization of deferred acquisition costs | (420.2) | (380.2) | $ (431.8)
Deferred Policy Acquisition Cost, Ending Balance | $ 322.1 | $ 296.2 | $ 319.0

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