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Financial Instruments - Fair Values of Derivative Instruments (Detail) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Derivatives, Fair Value [Line Items]    
Derivative assets, fair value $ 5.6 $ 3.0
Derivative liabilities, fair value 6.5 2.5
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 3.7 2.9
Foreign exchange contracts [Member] | Other Current Liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative liabilities, fair value 6.5 2.2
Commodity Contracts [Member] | Other Current Assets [Member]    
Derivatives, Fair Value [Line Items]    
Derivative assets, fair value $ 1.9 $ 0.1