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Financial Instruments - Fair Values of Derivative Instruments (Detail) - USD ($)
$ in Millions
Mar. 31, 2018
Dec. 31, 2017
Derivatives, Fair Value [Line Items]    
Derivative assets, fair value $ 2.8 $ 1.0
Derivative liabilities, fair value 2.7 6.4
Net investment hedges [Member] | Other current liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative liabilities, fair value 1.1 0.8
Foreign exchange contracts [Member] | Other current assets [Member]    
Derivatives, Fair Value [Line Items]    
Derivative assets, fair value 2.8 0.8
Foreign exchange contracts [Member] | Other current liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative liabilities, fair value $ 1.6 5.6
Commodity Contracts [Member] | Other current assets [Member]    
Derivatives, Fair Value [Line Items]    
Derivative assets, fair value   $ 0.2