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Other Expense (Income), Net - Components of Other Expense (Income), Net (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Other expense (income), net $ 0.9 $ (13.3) $ 29.0
Defined Benefit Plan [Member]      
Other expense (income), net (9.1) (1.3) 31.9
Foreign Currency Gain (Loss) [Member]      
Other expense (income), net 6.0 2.8 (0.7)
Losses (Gains) on Equity Investment [Member]      
Other expense (income), net 5.0 (11.0)  
Other Items, Net [Member]      
Other expense (income), net $ (1.0) $ (3.8) $ (2.2)