Derivatives - Schedule of Fair Value of Derivative Financial Instruments (Detail) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Derivatives, Fair Value [Line Items]
Fair Value of Derivatives, Asset	$ 15.7	$ 14.9
Fair Value of Derivatives, Liability	26.9	56.7
Derivatives Designated as Effective Hedges [Member] | Cash Flow Hedges [Member] | Cross-currency Swaps [Member]
Derivatives, Fair Value [Line Items]
Fair Value of Derivatives, Liability		21.5
Derivatives Designated as Effective Hedges [Member] | Cash Flow Hedges [Member] | Foreign Currency Contracts [Member]
Derivatives, Fair Value [Line Items]
Fair Value of Derivatives, Asset	4.8	2.0
Fair Value of Derivatives, Liability	1.5	6.6
Derivatives Designated as Effective Hedges [Member] | Fair Value Hedges [Member] | Interest Rate Swaps [Member]
Derivatives, Fair Value [Line Items]
Fair Value of Derivatives, Liability	20.5	7.8
Derivatives Not Designated as Effective Hedges [Member] | Foreign Currency Contracts [Member]
Derivatives, Fair Value [Line Items]
Fair Value of Derivatives, Asset	10.8	12.7
Fair Value of Derivatives, Liability	4.9	20.8
Derivatives Not Designated as Effective Hedges [Member] | Commodity Contracts [Member]
Derivatives, Fair Value [Line Items]
Fair Value of Derivatives, Asset	$ 0.1	$ 0.2