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Other (Income) Expense, Net - Components of Other (Income) Expense, Net (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Other Income And Expenses [Abstract]      
Defined benefit plan $ (1.3) $ 31.9 $ (6.5)
Foreign currency losses (gains) 2.8 (0.7) (2.0)
Gain on equity investment (11.0)    
Ineffective portion of cash flow hedge     (3.8)
Other items, net (3.8) (2.2) (4.0)
Total other (income) expense, net $ (13.3) $ 29.0 $ (16.3)