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Other Operating (Income) Expense (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Other Income And Expenses [Abstract]      
(Gain) loss on sale or disposition of business and assets $ 58.4 $ 71.1 $ (0.1)
Write-downs of assets [1] 55.6 17.9  
Other 2.6 0.2 3.6
Total other operating (income) expense $ 116.6 $ 89.2 $ 3.5
[1] Related to the write-down of certain assets to their recoverable amounts.