v3.25.1
Fair Value Measurements - Asset and Liability Measured at Fair Value Measured on Recurring Basis (Detail) - USD ($)
$ in Millions
Mar. 31, 2025
Dec. 31, 2024
Assets    
Available for sale customer funds assets $ 2,447.0 $ 2,327.3
Total assets measured at fair value 2,447.0 2,327.3
Fair Value, Inputs, Level 2 [Member]    
Assets    
Available for sale customer funds assets [1] 2,447.0 2,327.3
Total assets measured at fair value $ 2,447.0 $ 2,327.3
[1] Fair value is based on inputs that are observable for the asset or liability, other than quoted prices.