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Financial Instruments - Effects of Derivative Financial Instruments on Consolidated Statements of Income (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (Loss) Recognized in Income $ 0.9 $ (1.0) $ 2.3 $ (0.5)
Cash flow hedge [Member] | Cost of products sold [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (Loss) Recognized in Income 0.5 (0.1) 0.5 0.9
Fair value hedge [Member] | Other expense (income), net [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (Loss) Recognized in Income $ 0.4 $ (0.9) $ 1.8 $ (1.4)