Income Taxes - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Taxes [Line Items]
Tax benefits recognized for net operating loss carryforwards	$ 17.8	$ 12.4	$ 5.0
Net operating loss carryforwards	492.2
Deferred tax asset related to operating loss carryforwards	129.2
Valuation allowance	$ 102.1	118.5
Carryforward description	The carryforward periods range from four years to indefinite, subject to certain limitations under applicable laws.
Cash paid for income taxes	$ 374.0	586.0	607.6
Unrecognized tax benefits	24.5	30.7	21.2	$ 22.9
Unrecognized tax benefits that, if recognized, would affect the effective tax rate	23.2	28.4	18.9
(Income) expense related to interest	(0.7)	0.8	(0.1)
Accrued interest expense and penalties	1.2	$ 1.9	$ 1.1
Unrecognized tax benefits resulting from research and development tax credits	$ 5.5
Internal Revenue Service (IRS)
Income Taxes [Line Items]
Tax examinations	the United States Internal Revenue Service has completed examinations of the Company’s tax returns for all years through 2014.
Net Operating Loss Carryforwards
Income Taxes [Line Items]
Valuation allowance	$ 95.6
Minimum
Income Taxes [Line Items]
Operating loss carryforwards periods	4 years
Foreign
Income Taxes [Line Items]
Net operating loss carryforwards	$ 416.2
United States
Income Taxes [Line Items]
Net operating loss carryforwards	$ 76.0
Other Major Jurisdictions | Earliest Tax Year
Income Taxes [Line Items]
Tax year remain subject to examination	2012
Other Major Jurisdictions | Latest Tax Year
Income Taxes [Line Items]
Tax year remain subject to examination	2020