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Property, Plant and Equipment, Net - Depreciation Expense (Details) - USD ($)
$ in Millions
6 Months Ended 12 Months Ended
Dec. 31, 2020
Dec. 31, 2021
Jun. 30, 2020
Jun. 30, 2019
Property, Plant and Equipment [Abstract]        
Depreciation expense $ 5.0 $ 12.1 $ 11.0 $ 13.7