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Customer Trust Fund - Amortized Cost and Fair Value of Investment Security Available for Sale (Detail) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Investments Debt And Equity Securities [Abstract]    
Due in one year or less, Cost $ 3,161.8  
Due in one to three years, Cost 545.1  
Due in three to five years, Cost 601.1  
Due after five years, Cost 235.2  
Invested customer trust funds, Cost 4,543.2 $ 2,608.1
Due in one year or less, Fair Value 3,160.9  
Due in one to three years, Fair Value 545.3  
Due in three to five years, Fair Value 608.0  
Due after five years, Fair Value 234.7  
Invested customer trust funds, Fair Value $ 4,548.9 $ 2,591.9