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Other Income, Net - Components of Other Expense Net (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Component Of Other Expense Income Nonoperating [Line Items]      
Defined benefit plan [1] $ (6.5) $ (9.6) $ (14.2)
Asset impairment charge   7.0  
Foreign currency (gains)/losses (2.0) 0.9 2.8
Ineffective portion of cash flow hedge (3.8)    
Other items, net (4.0)   (1.2)
Total other income, net $ (16.3) $ (1.7) $ (12.6)
[1] Amounts revised to reflect adoption of ASU 2017-07 “Presentation of Net Periodic Pension and Postretirement Costs.”