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Financial Instruments - Fair Values of Derivative Instruments (Detail) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Derivatives, Fair Value [Line Items]    
Derivative assets, fair value $ 3.3 $ 1.0
Derivative liabilities, fair value 1.1 6.4
Net investment hedges [Member] | Other current assets [Member]    
Derivatives, Fair Value [Line Items]    
Derivative assets, fair value 0.3  
Net investment hedges [Member] | Other current liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative liabilities, fair value 0.1 0.8
Foreign exchange contracts [Member] | Other current assets [Member]    
Derivatives, Fair Value [Line Items]    
Derivative assets, fair value 2.9 0.8
Foreign exchange contracts [Member] | Other current liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative liabilities, fair value 1.0 5.6
Commodity Contracts [Member] | Other current assets [Member]    
Derivatives, Fair Value [Line Items]    
Derivative assets, fair value $ 0.1 $ 0.2