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Customer Trust Fund - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Investment income from invested customer trust fund included in revenue	$ 52.3	$ 80.2	$ 67.0
Maturities ranging from one to 120 days [Member]
Average customer trust funds held in liquidity portfolios, Percentage	49.00%
Maturities ranging from 120 days to 10 years [Member]
Average customer trust funds held in fixed income portfolios, Percentage	51.00%

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- Definition

Average customer trust funds maintained in fixed income portfolios percentage.

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Average customer trust funds maintained in liquidity portfolios percentage.

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Investment Income From Invested Customer Trust Fund

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