Income Taxes - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2021	Mar. 31, 2020
Income Taxes Disclosure [Line Items]
Decrease in unrecognized tax benefits within the next twelve months	$ 260.0
Increase in unrecognized tax benefits within the next twelve months	20.0
Amount of potential additional income tax expense related to an IRS revenue agents’ report subject to interest and penalties.	370.0
Provision for income taxes	$ 22.9	$ 5.2
Effective tax rate	10.40%	(1.00%)
Goodwill impairment		$ 612.0
U.S. corporate income tax rate	21.00%
Tax Reform and AHV Financing [Member]
Income Taxes Disclosure [Line Items]
Provision for income taxes	$ (10.0)

Amount of decrease reasonably possible in the next twelve months for the unrecognized tax benefit.

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Amount of increase reasonably possible in the next twelve months for the unrecognized tax benefit.

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