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Financial Instruments - Fair Values of Derivative Instruments (Detail) - USD ($)
$ in Millions
Jun. 30, 2016
Dec. 31, 2015
Derivatives, Fair Value [Line Items]    
Derivative assets, fair value $ 0.9 $ 6.8
Net investment hedges [Member] | Other current assets [Member]    
Derivatives, Fair Value [Line Items]    
Derivative assets, fair value 0.3 0.1
Foreign exchange contracts [Member] | Other current assets [Member]    
Derivatives, Fair Value [Line Items]    
Derivative assets, fair value 0.6 6.7
Foreign exchange contracts [Member] | Other current liabilities    
Derivatives, Fair Value [Line Items]    
Derivative liabilities, fair value $ 4.7 $ 3.1