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Trade and Other Receivables, Net - Schedule of Trade and Other Receivables, Net (Detail) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Receivables [Abstract]    
Trade receivables from customers $ 95.1 $ 75.7
Interest receivable from invested customer trust funds 1.8 1.3
Other 11.7 9.5
Total gross receivables 108.6 86.5
Less: reserve for sales adjustments (4.4) (3.7)
Less: allowance for doubtful accounts (3.1) (2.4)
Trade and other receivables, net $ 101.1 $ 80.4