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Customer Trust Fund - Gross Unrealized Losses and Related Fair Value of Investment (Detail)
$ in Millions
Mar. 31, 2020
USD ($)
Debt Securities, Available-for-sale [Line Items]  
Less than 12 months, Unrealized Losses $ (1.3)
Less than 12 months, Fair Value 200.6
12 months or more, Fair Value 31.2
Total, Unrealized Losses (1.3)
Total, Fair Value 231.8
Corporate Debt Securities [Member]  
Debt Securities, Available-for-sale [Line Items]  
Less than 12 months, Unrealized Losses (0.5)
Less than 12 months, Fair Value 86.6
12 months or more, Fair Value 31.2
Total, Unrealized Losses (0.5)
Total, Fair Value 117.8
Asset-backed Securities [Member]  
Debt Securities, Available-for-sale [Line Items]  
Less than 12 months, Unrealized Losses (0.8)
Less than 12 months, Fair Value 114.0
Total, Unrealized Losses (0.8)
Total, Fair Value $ 114.0