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Changes in Accumulated Other Comprehensive Loss by Component (Parenthetical) (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Cost of products sold $ 1,758.0 $ 1,566.6 $ 1,526.7
Unrealized net gain on cash flow derivatives      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Realized gains on derivatives reclassified to cost of products sold, tax provision 0.4 0.1  
Pension liability      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Reclassification, before income tax benefit 17.5 16.0  
Tax provision (benefit) (6.8) (6.2)  
Reclassification net of tax [1] (10.7) (9.8)  
Actuarial losses      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Reclassification, before income tax benefit [2] 17.9 17.5  
Prior year service cost      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Reclassification, before income tax benefit [2] (0.4) (1.5)  
Reclassification out of Accumulated Other Comprehensive Income | Unrealized net gain on cash flow derivatives      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Cost of products sold (1.0) (0.2)  
Tax provision (benefit) (0.4) (0.1)  
Reclassification net of tax $ (0.6) $ (0.1)  
[1] Amounts reclassified from accumulated other comprehensive loss: Realized gains on derivatives reclassified to cost of products sold (1.0 ) (0.2 ) Tax provision 0.4 0.1 Reclassification net of tax $ (0.6 ) $ (0.1 ) Amortization of pension items: Actuarial losses $ 17.9 (2) $ 17.5 (2) Prior year service cost (0.4 )(2) (1.5 )(2) 17.5 16.0 Tax benefit (6.8 ) (6.2 ) Reclassification net of tax $ 10.7 $ 9.8
[2] These accumulated other comprehensive loss components are included in the computation of net periodic benefit cost. See Note 10 - Pensions and Other Post-retirement Benefits for additional details