Income Taxes - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Income Taxes [Line Items]
Effective income tax rate	29.30%	27.40%	26.50%	27.40%
Increase/(decrease) in effective tax rate due to impact of discrete tax items	(4.40%)	1.30%	(7.60%)	0.40%
Net increase to income tax reserves for unrecognized tax benefits based on tax positions related to current and prior years			$ 3.0
Unrecognized tax benefits reserve that would impact effective tax rate if released into income	$ 68.3		68.3
Current Tax Payable Within Other Current Liabilities
Income Taxes [Line Items]
Unrecognized tax benefits reserve that would impact effective tax rate if released into income	1.8		1.8
Non-Current Tax Payable Within Other Non-current Liabilities
Income Taxes [Line Items]
Unrecognized tax benefits reserve that would impact effective tax rate if released into income	$ 66.5		$ 66.5