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Income Taxes - Summary of Difference 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, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
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		$ 534.4	$ 468.4	$ 361.0
Differences in income taxes on foreign earnings, losses and remittances		(128.9)	(43.9)	(79.2)
Valuation allowance adjustments		(56.8)	(44.2)	24.6
Tax credits		(26.8)	(2.7)	(5.7)
Repatriation of certain foreign earnings		(289.7)	0.0	0.0
Transition tax on accumulated foreign earnings	$ 131.0	131.0	0.0	0.0
U.S. tax rate change and other tax reform items		42.5	0.0	0.0
Tax audits and assessments		(1.4)	(1.8)	0.7
Other		(6.8)	(5.6)	(15.9)
Provision for income taxes		$ 197.5	$ 370.2	$ 285.5

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Effective Income Tax Rate Reconciliation, Tax Cuts and Jobs Act of 2017, Transition Tax on Accumulated Foreign Earnings, Amount

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