Derivative Instruments and Hedging Activities - Gross Unrealized Losses from Derivative Instruments (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized cash flow hedge gains, Before Tax	$ 81.1	$ (116.0)	$ 29.7
Cash Flow Hedges [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized cash flow hedge gains, Before Tax	81.1	(116.0)	29.7
Amount of Gain / (Loss) Reclassified from AOCI	(26.8)	4.6	19.6
Cash Flow Hedges [Member] | Foreign Exchange Forward Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized cash flow hedge gains, Before Tax	82.8	(116.5)	25.7
Cash Flow Hedges [Member] | Foreign Exchange Forward Contracts [Member] | Cost of Products Sold [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain / (Loss) Reclassified from AOCI	(26.2)	5.1	87.7
Cash Flow Hedges [Member] | Interest Rate Swaps [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized cash flow hedge gains, Before Tax	(1.7)	0.5	4.0
Cash Flow Hedges [Member] | Forward Starting Interest Rate Swaps [Member] | Interest Expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain / (Loss) Reclassified from AOCI	$ (0.6)	$ (0.5)	(1.7)
Cash Flow Hedges [Member] | Forward Starting Interest Rate Swaps [Member] | Other Expense Net [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain / (Loss) Reclassified from AOCI			$ (66.4)