Income Taxes - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Tax Note Textuals [Line Items]
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount			$ (22.9)
Tax Benefit, CARES Act	$ 10.7
Undistributed Earnings of Foreign Subsidiaries	913.7
Deferred Tax Liability Not Recognized, Amount of Unrecognized Deferred Tax Liability, Undistributed Earnings of Foreign Subsidiaries	240.9
Net operating loss carryforwards in Luxembourg	224.9
Excess Tax benefit from stock activity	3.0	$ 4.6	2.2
Estimated change in unrecognized tax benefits	15.0
Interest (income) expense related to tax matters	(2.0)	(0.3)	(0.9)
Interest accrued from income tax examinations	0.9	$ 2.9	$ 3.2
Continuing Operations [Member]
Tax Note Textuals [Line Items]
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	16.7
Discontinued Operations [Member]
Tax Note Textuals [Line Items]
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	0.5
Luxembourg Deferred Tax Assets
Tax Note Textuals [Line Items]
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	(25.9)
German and UK Deferred Tax Assets
Tax Note Textuals [Line Items]
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	$ 21.7