Income Taxes - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Tax Note Textuals [Line Items]
Change in assessment	$ (5.6)	$ 22.9	$ 0.0
Aggregate Net Tax Expense from US Tax Reform			129.2
Undistributed Earnings of Foreign Subsidiaries	1,415.0
Deferred Tax Liability Not Recognized, Amount of Unrecognized Deferred Tax Liability, Undistributed Earnings of Foreign Subsidiaries	107.5
Net operating loss carryforwards in Luxembourg	230.3
Excess Tax benefit from stock activity	$ 4.6	2.2	2.7
The tax benefits recognized in the Consolidated Financial Statements from such positions are measured based on the largest benefit that has a greater than 50% likelihood of being realized upon ultimate settlement	The tax benefits recognized in the Consolidated Financial Statements from such positions are measured based on the largest benefit that has a greater than 50% likelihood of being realized upon ultimate settlement.
Estimated change in unrecognized tax benefits	$ 14.0
Interest (income) expense related to tax matters	(0.3)	(0.9)	(2.4)
Interest accrued from income tax examinations	2.9	$ 3.2	$ 4.1
Continuing Operations [Member]
Tax Note Textuals [Line Items]
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	20.9
Discontinued Operations [Member]
Tax Note Textuals [Line Items]
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	1.2
Impacts from U.S. Tax Act of 2017 [Member]
Tax Note Textuals [Line Items]
2017 U.S. Federal Statutory Tax Rate			35.00%
2018 U.S. Federal Statutory Tax Rate		21.00%
One Time Provisional US Tax Expense on Post 1986 Foreign Earnings			$ 57.9
Remeasurement of US Net Deferred Taxes			86.0
Tax Expense on Undistributed Foreign Earnings			14.7
Foreign Tax Authority [Member]
Tax Note Textuals [Line Items]
Change in assessment	$ (5.6)	$ 22.9	$ 0.0