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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
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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

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