v3.26.1
Contingencies - Additional Information (Detail) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2026
Dec. 31, 2025
Other Commitments [Line Items]    
Guarantees $ 5.9 $ 6.0
Maximum [Member]    
Other Commitments [Line Items]    
Fixed maturity guarantee remaining term 6 years