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Financial Instruments - Notional Amount, Estimated Fair Value and Related Balance Sheet Classification of Foreign Currency Derivative Contracts (Detail) - Foreign currency contract - USD ($)
$ in Millions
6 Months Ended 12 Months Ended
Jun. 30, 2018
Dec. 31, 2017
Contracts balance sheet classification:    
Derivative, fair value, asset (liability), net $ (3.4) $ (22.8)
Notional amount 2,413.6 2,219.6
Designated as hedging instrument | Cash flow hedge    
Contracts balance sheet classification:    
Other current assets 14.1 16.9
Other long-term assets 1.4 1.3
Other current liabilities (18.5) (28.4)
Other long-term liabilities (6.9) (8.0)
Derivative, fair value, asset (liability), net (9.9) (18.2)
Notional amount $ 1,298.5 $ 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 $ 10.7 $ 1.8
Other current liabilities (4.2) (6.4)
Notional amount 1,115.1 681.1
Other derivatives not designated as hedging instruments at fair value, net $ 6.5 $ (4.6)
Not designated as hedging instrument | Maximum    
Contracts balance sheet classification:    
Outstanding maturities in months, not to exceed 12 months 12 months