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Property, Plant and Equipment, Net - Depreciation Expense (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Property, Plant and Equipment [Abstract]        
Depreciation expense $ 3.4 $ 2.5 $ 6.3 $ 5.1