Income Taxes - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Income Taxes Disclosure [Line Items]
Decrease in unrecognized tax benefits within the next twelve months	$ 250.0		$ 250.0
Increase in unrecognized tax benefits within the next twelve months	20.0		20.0
Amount of potential additional income tax expense related to an IRS revenue agents report subject to interest and penalties	370.0		370.0
Provision (benefit) for income taxes	$ 31.4	$ (13.7)	$ 54.3	$ (8.5)
Effective tax rate	18.00%	6.20%	13.80%	1.20%
Goodwill impairment				$ 612.0
U.S. corporate income tax rate			21.00%
Tax Reform and AHV Financing [Member]
Income Taxes Disclosure [Line Items]
Provision (benefit) for income taxes			$ (10.0)

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

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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

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