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Other Expense (Income), Net - Components of Other Expense (Income), Net (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Other Income And Expenses [Abstract]      
Defined benefit plan $ 31.9 $ (6.5) $ (9.6)
Asset impairment charge     7.0
Foreign currency (gains)/losses (0.7) (2.0) 0.9
Ineffective portion of cash flow hedge   (3.8)  
Other items, net (2.2) (4.0)  
Total other expense (income), net $ 29.0 $ (16.3) $ (1.7)