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Accumulated Other Comprehensive (Loss) Income - Reclassifications Out of Accumulated Other Comprehensive (Loss) Income (Detail) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Cost of products sold $ 769.8 $ 728.7
Tax (expense) benefit 26.4 23.0
Reclassification from Accumulated Other Comprehensive Income (Loss), Current Period, Net of Tax 1.2 1.1
Defined benefit plan items [Member]    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax 3.0 1.4
Reclassification from AOCI, Current Period, Tax (1.2) (0.5)
Reclassification from Accumulated Other Comprehensive Income (Loss), Current Period, Net of Tax 1.8 0.9
Derivative Hedging Gains (Loss) [Member]    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Reclassification from Accumulated Other Comprehensive Income (Loss), Current Period, Net of Tax (0.6) 0.2
Prior service credits [Member]    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax [1] 3.0 2.3
Actuarial losses [Member]    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax [1]   (0.9)
Reclassification out of Accumulated Other Comprehensive Income (Loss) [Member] | Derivative Hedging Gains (Loss) [Member]    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Tax (expense) benefit   (0.4)
Reclassification from Accumulated Other Comprehensive Income (Loss), Current Period, Net of Tax (0.6) 0.2
Reclassification out of Accumulated Other Comprehensive Income (Loss) [Member] | Derivative Hedging Gains (Loss) [Member] | Foreign exchange contracts [Member]    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Cost of products sold $ (0.6) $ 0.6
[1] These accumulated other comprehensive loss components are included in the computation of net periodic benefit cost. Refer to Note 11, "Defined Benefit Plans," for additional information.