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Financial Instruments - Fair Values of Derivative Instruments (Detail) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Derivatives, Fair Value [Line Items]    
Derivative assets, fair value $ 3.4 $ 6.8
Derivative liabilities, fair value 3.1 3.1
Net investment hedges [Member] | Other current assets [Member]    
Derivatives, Fair Value [Line Items]    
Derivative assets, fair value 0.6 0.1
Net investment hedges [Member] | Other current liabilities    
Derivatives, Fair Value [Line Items]    
Derivative liabilities, fair value 0.2  
Foreign exchange contracts [Member] | Other current assets [Member]    
Derivatives, Fair Value [Line Items]    
Derivative assets, fair value 2.8 6.7
Foreign exchange contracts [Member] | Other current liabilities    
Derivatives, Fair Value [Line Items]    
Derivative liabilities, fair value $ 2.9 $ 3.1