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Financial Instruments - Effects of Derivative Financial Instruments on Consolidated Statements of Income (Detail) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Derivative Instruments, Gain (Loss) [Line Items]    
(Loss) Gain Recognized in Income $ (0.6) $ (1.7)
Cash flow hedge [Member] | Cost of products sold [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
(Loss) Gain Recognized in Income (0.5) (0.6)
Fair value hedge [Member] | Other income, net [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
(Loss) Gain Recognized in Income $ (0.1) $ (1.1)