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Inventories - Narrative (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Jun. 30, 2020
Dec. 31, 2019
Inventory [Line Items]      
Inventory valuation reserves $ 13.9   $ 10.7
Scrap Processing Facility      
Inventory [Line Items]      
Inventory valuation reserves     $ 4.8
Disposal Group, Held-for-sale, Not Discontinued Operation      
Inventory [Line Items]      
Inventory valuation reserves   $ 3.1