Derivatives - Schedule of Pretax Effects of Derivative Financial Instruments Designated or Previously Designated as Effective Hedges (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Derivative Instruments, Gain (Loss) [Line Items]
Gain/(Loss) Recognized in OCI (effective portion)	$ 17.0	$ (8.8)	$ 8.3	$ (24.2)
Gain/(Loss) Reclassified from AOCI to Income	(6.2)	3.4	(19.3)	3.1
Interest Rate Swaps [Member] | Interest Expense, Net [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain/(Loss) Reclassified from AOCI to Income	(1.9)	(2.1)	(3.8)	(4.1)
Foreign Currency Contracts [Member] | Sales and Cost of Sales [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain/(Loss) Recognized in OCI (effective portion)	15.3	(11.2)	10.0	(23.0)
Gain/(Loss) Reclassified from AOCI to Income	(6.1)	4.2	(12.5)	12.8
Cross-currency Swaps [Member] | Other Income (Expense), Net [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain/(Loss) Recognized in OCI (effective portion)	1.7	2.4	(1.7)	(1.2)
Gain/(Loss) Reclassified from AOCI to Income	$ 1.8	$ 1.3	$ (3.0)	$ (5.6)