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Financial Instruments - Fair Values of Derivative Instruments (Detail) - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Derivatives, Fair Value [Line Items]    
Derivative assets, fair value $ 3.5 $ 5.6
Derivative liabilities, fair value 1.3 6.5
Foreign exchange contracts [Member] | Other Current Assets [Member]    
Derivatives, Fair Value [Line Items]    
Derivative assets, fair value 3.2 3.7
Foreign exchange contracts [Member] | Other Current Liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative liabilities, fair value 1.3 6.5
Commodity Contracts [Member] | Other Current Assets [Member]    
Derivatives, Fair Value [Line Items]    
Derivative assets, fair value 0.2 $ 1.9
Net Investment Hedges [Member] | Other Current Assets [Member]    
Derivatives, Fair Value [Line Items]    
Derivative assets, fair value $ 0.1