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Income Taxes - Summary of Differences Between Provision (Benefit) for Income Taxes Calculated at United States Federal Statutory Income Tax Rate and Consolidated Provision (Benefit) for Income Taxes (Detail) - USD ($) $ in Millions	3 Months Ended				12 Months Ended
	Dec. 31, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Consolidated income before provision for income taxes and equity in net income of affiliates multiplied by the United States federal statutory income tax rate					$ 323.1	$ 534.4	$ 468.4
Differences in income taxes on foreign earnings, losses and remittances					56.6	(128.9)	(43.9)
Valuation allowance adjustments	$ 11.1				(52.4)	(56.8)	(44.2)
Research and development and other tax credits					(9.9)	(26.8)	(2.7)
Repatriation of certain foreign earnings			$ 22.0		0.0	(289.7)	0.0
Transition tax on accumulated foreign earnings				$ 131.0	(15.1)	131.0	0.0
U.S. tax rate change and other tax reform items					9.8	42.5	0.0
Foreign-derived intangible income (FDII) deduction					(27.6)	0.0	0.0
U.S. expenses apportioned to GILTI and foreign branches					17.6	0.0	0.0
Tax audits and assessments	$ (15.8)	$ (17.4)			6.9	(1.4)	(1.8)
Other					2.9	(6.8)	(5.6)
Provision for income taxes					$ 311.9	$ 197.5	$ 370.2

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