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Deferred Policy Acquisition Costs (Details) - USD ($)
$ in Millions
 12 Months Ended
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