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Impact of Derivative Contracts on Company's Financial Statements (Detail) - Designated as Hedging Instrument - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Derivatives, Fair Value [Line Items]    
Fair value of derivative instruments, total $ (1.4) $ 0.4
Foreign Currency Contracts | Other Current Assets    
Derivatives, Fair Value [Line Items]    
Fair value of derivative instruments, assets 0.2 1.9
Foreign Currency Contracts | Accrued Liabilities    
Derivatives, Fair Value [Line Items]    
Fair value of derivative instruments, liabilities (1.8) (2.0)
Commodities Contracts | Other Current Assets    
Derivatives, Fair Value [Line Items]    
Fair value of derivative instruments, assets $ 0.2 0.8
Commodities Contracts | Accrued Liabilities    
Derivatives, Fair Value [Line Items]    
Fair value of derivative instruments, liabilities   $ (0.3)