Derivatives - Schedule of Pretax Effects of Derivative Financial Instruments Designated or Previously Designated as Effective Hedges (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Derivative Instruments, Gain (Loss) [Line Items]
Gain/(Loss) Recognized in OCI (effective portion)	$ 1.7	$ (13.2)	$ 10.0	$ (37.4)
Gain/(Loss) Reclassified from AOCL to Income	(4.9)	(3.2)	(24.2)	(0.1)
Interest Rate Swaps [Member] | Interest Expense, Net [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain/(Loss) Reclassified from AOCL to Income	(1.9)	(2.1)	(5.7)	(6.2)
Foreign Currency Contracts [Member] | Sales and Cost of Sales [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain/(Loss) Recognized in OCI (effective portion)	1.7	(12.8)	11.7	(35.8)
Gain/(Loss) Reclassified from AOCL to Income	$ (3.0)	(0.4)	(15.5)	12.4
Cross-currency Swaps [Member] | Other Income (Expense), Net [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain/(Loss) Recognized in OCI (effective portion)		(0.4)	(1.7)	(1.6)
Gain/(Loss) Reclassified from AOCL to Income		$ (0.7)	$ (3.0)	$ (6.3)