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Derivative Instruments and Hedging Activities - Gross Unrealized Losses from Derivative Instruments (Detail) - Cash Flow Hedges [Member] - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Derivative Instruments, Gain (Loss) [Line Items]      
Amount of Gain / (Loss) Recognized in OCI $ (116.0) $ 29.7 $ 59.1
Amount of Gain / (Loss) Reclassified from OCI 4.6 19.6 121.0
Foreign Exchange Forward Contracts [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Amount of Gain / (Loss) Recognized in OCI (116.5) 25.7 97.4
Foreign Exchange Forward Contracts [Member] | Cost of Products Sold [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Amount of Gain / (Loss) Reclassified from OCI 5.1 87.7 122.3
Interest Rate Swaps [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Amount of Gain / (Loss) Recognized in OCI 0.5 4.0  
Forward Starting Interest Rate Swaps [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Amount of Gain / (Loss) Recognized in OCI     (38.3)
Forward Starting Interest Rate Swaps [Member] | Interest Expense [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Amount of Gain / (Loss) Reclassified from OCI $ (0.5) (1.7) $ (1.3)
Forward Starting Interest Rate Swaps [Member] | Other Expense Net [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Amount of Gain / (Loss) Reclassified from OCI   $ (66.4)