Income Taxes - Additional Information (Detail) $ in Millions	1 Months Ended	9 Months Ended
	Apr. 30, 2020 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2019	Dec. 31, 2019 USD ($)
Income Tax Disclosure [Abstract]
Effective income tax rate		19.90%	14.20%
Coronavirus Aid, Relief, and Economic Security Act, Income Tax Expense (Benefit)		$ 28.7
Effective Income Tax Rate Reconciliation, Tax Cuts and Jobs Act, Percent	0.005	0.010
Tax Cuts and Jobs Act, Transition Tax for Accumulated Foreign Earnings, Income Tax Expense		$ 5.1
Tax Cuts and Jobs Act, Income Tax Expense (Benefit)	$ 14.1
Total gross liability for unrecognized tax benefits		$ 46.8		$ 47.4