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Statutory Accounting and Regulatory Requirements - Additional Information (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2023
Statutory Accounting Practices [Line Items]        
Dividends to the Company 10.00%      
Dividends paid $ 77.7 $ 148.4 $ 88.6  
Forecast [Member]        
Statutory Accounting Practices [Line Items]        
Dividends permissible to pay without seeking regulatory approval       $ 56.0