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Other Charges, Net - Components of other charges (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Other Charges (Gain), Net        
Information technology transformation costs $ 1.1 $ 0.5 $ 2.6 $ 1.8
Professional fees incurred in connection with investigation matters 0.1 0.3 0.1 4.8
Restructuring charges 0.9 1.7 3.6 4.4
Acquisition-related charges 0.6 0.9 3.8 (1.0)
Long-lived asset impairments (0.6) 0.7 (0.6) 1.9
Other   0.1   0.3
Other charges, net $ 2.1 $ 4.2 $ 9.5 $ 12.2