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Financial Instruments - Fair Values of Derivative Instruments (Detail) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Derivatives, Fair Value [Line Items]    
Derivative assets, fair value $ 5.1 $ 6.0
Derivative liabilities, fair value 0.6 1.9
Net investment hedges [Member] | Other Current Assets [Member]    
Derivatives, Fair Value [Line Items]    
Derivative assets, fair value 0.2 0.7
Foreign exchange contracts [Member] | Fair value hedging [Member] | Other Current Assets [Member]    
Derivatives, Fair Value [Line Items]    
Derivative assets, fair value 2.3 1.4
Foreign exchange contracts [Member] | Fair value hedging [Member] | Other current liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative liabilities, fair value 0.5 1.6
Foreign exchange contracts [Member] | Cash flow hedging [Member] | Other Current Assets [Member]    
Derivatives, Fair Value [Line Items]    
Derivative assets, fair value 2.6 3.9
Foreign exchange contracts [Member] | Cash flow hedging [Member] | Other current liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative liabilities, fair value $ 0.1 $ 0.3