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Reserves for Losses and Adjustment Expenses - Additional Information (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Insurance [Abstract]      
Provision for losses and LAE for claims incurred $ 28.1 $ 45.1 $ (0.9)
Prior years 28.1 45.1 (0.9)
Financial Guarantee Insurance Contracts, Premium Received over Contract Period [Line Items]      
Prior years 28.1 $ 45.1 $ (0.9)
Insurance      
Insurance [Abstract]      
Provision for losses and LAE for claims incurred 86.9    
Prior years 86.9    
Financial Guarantee Insurance Contracts, Premium Received over Contract Period [Line Items]      
Prior years $ 86.9