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Financial Instruments - Fair Values of Derivative Instruments (Detail) - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
Derivatives, Fair Value [Line Items]    
Derivative assets, fair value $ 2.6 $ 3.0
Derivative liabilities, fair value 6.4 2.5
Net investment hedges [Member] | Other Current Assets [Member]    
Derivatives, Fair Value [Line Items]    
Derivative assets, fair value 0.1  
Net investment hedges [Member] | Other Current Liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative liabilities, fair value 0.4 0.3
Foreign exchange contracts [Member] | Other Current Assets [Member]    
Derivatives, Fair Value [Line Items]    
Derivative assets, fair value 2.5 2.9
Foreign exchange contracts [Member] | Other Current Liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative liabilities, fair value $ 6.0 2.2
Commodity Contracts [Member] | Other Current Assets [Member]    
Derivatives, Fair Value [Line Items]    
Derivative assets, fair value   $ 0.1