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Financial Instruments - Fair Values of Derivative Instruments (Detail) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Derivatives, Fair Value [Line Items]    
Derivative assets, fair value $ 3.0 $ 6.0
Derivative liabilities, fair value 2.5 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 0.3  
Foreign exchange contracts [Member] | Other Current Assets [Member]    
Derivatives, Fair Value [Line Items]    
Derivative assets, fair value 2.9 5.3
Foreign exchange contracts [Member] | Other Current Liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative liabilities, fair value 2.2 $ 1.9
Commodity Contracts [Member] | Other Current Assets [Member]    
Derivatives, Fair Value [Line Items]    
Derivative assets, fair value $ 0.1