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Financial Instruments - Effects of Derivative Financial Instruments on Consolidated Statements of Income (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (Loss) Recognized in Income $ 2.0 $ 2.2 $ 1.4 $ 0.5
Cash flow hedge [Member] | Cost of products sold [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (Loss) Recognized in Income 0.5 1.6   1.0
Fair value hedge [Member] | Other expense (income), net [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (Loss) Recognized in Income $ 1.5 $ 0.6 $ 1.4 $ (0.5)