Income Taxes - Additional Information (Detail) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
	Jun. 18, 2019	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Income Tax Contingency [Line Items]
Effective Income Tax Rate		16.80%	(226.50%)	0.00%	20.30%
Discrete tax benefit for a withholding tax refund received from Switzerland		$ (13.2)
Discrete tax benefit related to change in tax status of various non-U.S. jurisdictions		(10.7)		$ (10.7)	$ (6.8)
Discrete tax expense for excess book deductions for equity-based compensation				14.4
Discrete tax expense for excess book deductions for equity-based compensation		14.4	$ 11.0		(5.2)
Tax expense for interest related to uncertain tax liabilities		4.6		4.6	3.8
Discrete tax adjustments for certain state tax return to provision adjustments				(10.1)
Tax expense for additional interest related to uncertain tax liabilities		3.8		3.8
Discrete tax benefit for return to provision adjustments		$ (0.7)	$ (0.7)		(0.7)
Discrete tax adjustment for reduction in valuation allowance related to operations in France					(69.4)
Swiss Federal Tax Administration
Income Tax Contingency [Line Items]
Discrete tax benefit for a withholding tax refund received from Switzerland				$ (13.2)
Minimum | Internal Revenue Service (IRS) | 2018 Tax Year
Income Tax Contingency [Line Items]
Unrecognized income tax expense due to change in tax regulations	$ 180.0
Maximum | Internal Revenue Service (IRS) | 2018 Tax Year
Income Tax Contingency [Line Items]
Unrecognized income tax expense due to change in tax regulations	$ 220.0
FRANCE
Income Tax Contingency [Line Items]
Discrete tax expense for excess book deductions for equity-based compensation					11.0
Europe
Income Tax Contingency [Line Items]
Tax expense for additional interest related to uncertain tax liabilities					2.2
Tax expense related to tax audits in Europe					$ 26.1