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Other Charges, Net - Components of other charges (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Other Charges (Gain), Net        
Information technology transformation costs $ 0.8 $ 0.4 $ 1.5 $ 1.3
Professional fees incurred in connection with investigation matters (0.1) 1.1   4.5
Restructuring charges 1.4 1.2 2.7 2.7
Acquisition-related charges 2.3 (0.8) 3.2 (1.9)
Long-lived asset impairments       1.2
Other   (0.1)   0.2
Other charges, net $ 4.4 $ 1.8 $ 7.4 $ 8.0