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Properties, Plant and Equipment - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Property, Plant and Equipment [Abstract]        
Depreciation expense $ 0.1 $ 0.7 $ 0.3 $ 1.1