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Customer Trust Fund - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Investments Debt And Equity Securities [Abstract]
Investment income from invested customer trust fund included in revenue	$ 24.3	$ 17.6

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- Definition

Investment Income From Invested Customer Trust Fund

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No definition available.

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