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Financial Instruments - Effects of Derivative Financial Instruments on Consolidated Statements of Income (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Derivative Instruments, Gain (Loss) [Line Items]      
Gain (Loss) Recognized in Income $ (1.1) $ (1.5) $ 11.8
Cash flow hedge [Member] | Cost of products sold [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Gain (Loss) Recognized in Income 0.9 (3.5) 3.6
Fair value hedge [Member] | Other (income) expense, net [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Gain (Loss) Recognized in Income $ (2.0) $ 2.0 $ 8.2