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Financial Instruments - Gross Notional Amounts for Outstanding Derivatives (Detail) - Forward contracts - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Derivatives Designated as Hedging Instruments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Notional amounts of outstanding currency forward contracts $ 128.5 $ 109.7
Derivatives Not Designated as Hedging Instruments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Notional amounts of outstanding currency forward contracts 168.4 143.7
Prepaid and other current assets | Derivatives Designated as Hedging Instruments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Notional amounts of outstanding currency forward contracts 0.9 6.2
Prepaid and other current assets | Derivatives Not Designated as Hedging Instruments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Notional amounts of outstanding currency forward contracts 1.2 5.6
Other accrued liabilities | Derivatives Designated as Hedging Instruments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Notional amounts of outstanding currency forward contracts 2.9 1.0
Other accrued liabilities | Derivatives Not Designated as Hedging Instruments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Notional amounts of outstanding currency forward contracts $ 4.6 $ 0.6