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Financial Instruments - Notional Amount, Estimated Fair Value and Related Classification of Derivatives (Detail) - Foreign currency contract - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Contracts balance sheet classification:    
Derivative, fair value, asset (liability), net $ 31.1 $ (22.8)
Notional amount 2,637.9 2,219.6
Designated as hedging instrument | Cash flow hedge    
Contracts balance sheet classification:    
Other current assets 39.4 16.9
Other long-term assets 6.4 1.3
Other current liabilities (15.5) (28.4)
Other long-term liabilities (0.7) (8.0)
Derivative, fair value, asset (liability), net 29.6 (18.2)
Notional amount $ 1,408.0 $ 1,538.5
Designated as hedging instrument | Cash flow hedge | Maximum    
Contracts balance sheet classification:    
Outstanding maturities in months, not to exceed 24 months 24 months
Not designated as hedging instrument    
Contracts balance sheet classification:    
Other current assets $ 6.5 $ 1.8
Other current liabilities (5.0) (6.4)
Notional amount 1,229.9 681.1
Other derivatives not designated as hedging instruments at fair value, net $ 1.5 $ (4.6)
Not designated as hedging instrument | Maximum    
Contracts balance sheet classification:    
Outstanding maturities in months, not to exceed 9 months 12 months