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Reinsurance - Amount Recoverable From Reinsurers (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Insurance [Abstract]      
Reinsurance recoverable on paid loss $ 59.9 $ 57.5  
Ceded unpaid loss and LAE 221.4 228.8 $ 216.8
Total reinsurance recoverable $ 281.3 $ 286.3