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Other Charges, Net - Components of other charges (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Other Charges (Gain), Net    
Information technology transformation costs $ 0.7 $ 0.9
Professional fees incurred in connection with investigation matters 0.1 3.4
Restructuring charges 1.3 1.5
Acquisition-related charges 0.9 (1.1)
Long-lived asset impairments   1.2
Other   0.3
Other charges, net $ 3.0 $ 6.2