v3.25.1
Customer Funds - Amortized Cost and Fair Value of Investment Security Available for Sale (Detail) - USD ($)
$ in Millions
Mar. 31, 2025
Dec. 31, 2024
Investments, Debt and Equity Securities [Abstract]    
Due in one year or less, Cost $ 3,275.5  
Due in one to three years, Cost 1,002.1  
Due in three to five years, Cost 671.6  
Due after five years, Cost 387.0  
Invested customer funds, Cost 5,336.2 $ 5,003.8
Due in one year or less, Fair Value 3,273.2  
Due in one to three years, Fair Value 988.5  
Due in three to five years, Fair Value 683.2  
Due after five years, Fair Value 390.5  
Invested customer funds, Fair Value $ 5,335.4 $ 4,978.2