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Other Charges, Net - Components of other charges (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Other Charges, Net      
Acquisition-related expenses (income), net $ 2.4 $ 4.6 $ 3.4
Professional fees incurred in connection with investigation matters and other legal matters 5.9 2.1 4.5
Information technology transformation costs 2.5 3.7 4.8
Restructuring charges 12.0 (3.9) 6.8
Long-lived asset impairments 2.1    
Other charges, net $ 24.9 $ 6.5 $ 19.5