v3.25.2
Contingencies - Additional Information (Detail) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2025
Dec. 31, 2024
Other Commitments [Line Items]    
Guarantees $ 8.3 $ 6.8
Maximum [Member]    
Other Commitments [Line Items]    
Fixed maturity guarantee remaining term 7 years