Income Taxes - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Income Tax Examination [Line Items]
Effective tax benefit rate	23.10%	0.80%
U.S. federal statutory rate	21.00%	21.00%
Effective Income Tax, Reconciliation Foreign, Federal, and State, Amount	$ 16.2	$ 13.7
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount	(2.1)	(7.9)
Effective Income Tax Rate Reconciliation, Tax Expense (Benefit), Share-based Payment Arrangement, Amount	(16.2)	$ (21.0)
Unrecognized tax benefits	34.7		$ 32.8
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	$ 14.1		$ 13.6