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Fair Value Measurements - Asset and Liability Measured at Fair Value Measured on Recurring Basis (Detail) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Assets    
Available for sale customer funds assets $ 2,163.0 $ 1,719.1
Total assets measured at fair value 2,163.0 1,719.1
Fair Value, Inputs, Level 2 [Member]    
Assets    
Available for sale customer funds assets [1] 2,163.0 1,719.1
Total assets measured at fair value $ 2,163.0 $ 1,719.1
[1] Fair value is based on inputs that are observable for the asset or liability, other than quoted prices.