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Financial Instruments - Fair Values of Derivative Instruments (Detail) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Derivatives, Fair Value [Line Items]    
Derivative assets, fair value $ 2.0 $ 6.0
Derivative liabilities, fair value 1.6 1.9
Net investment hedges [Member] | Other Current Assets [Member]    
Derivatives, Fair Value [Line Items]    
Derivative assets, fair value   0.7
Net investment hedges [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 1.3 3.9
Foreign exchange contracts [Member] | Cash flow hedging [Member] | Other Current Liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative liabilities, fair value 0.7 0.3
Foreign exchange contracts [Member] | Fair value hedging [Member] | Other Current Assets [Member]    
Derivatives, Fair Value [Line Items]    
Derivative assets, fair value 0.7 1.4
Foreign exchange contracts [Member] | Fair value hedging [Member] | Other Current Liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative liabilities, fair value $ 0.4 $ 1.6