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Financial Instruments - Fair Values of Derivative Instruments (Detail) - USD ($)
$ in Millions
Jun. 30, 2017
Dec. 31, 2016
Derivatives, Fair Value [Line Items]    
Derivative assets, fair value $ 3.8 $ 3.4
Derivative liabilities, fair value 1.2 3.1
Net investment hedges [Member] | Other current assets [Member]    
Derivatives, Fair Value [Line Items]    
Derivative assets, fair value   0.6
Net investment hedges [Member] | Other current liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative liabilities, fair value 0.4 0.2
Foreign exchange contracts [Member] | Other current assets [Member]    
Derivatives, Fair Value [Line Items]    
Derivative assets, fair value 3.8 2.8
Foreign exchange contracts [Member] | Other current liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative liabilities, fair value $ 0.8 $ 2.9