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Inventories, Net (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Inventory Disclosure [Abstract]    
Finished goods $ 38.4 $ 45.3
Semi-finished goods 64.9 48.8
Raw materials, supplies and other 10.8 19.3
Inventory, net $ 114.1 $ 113.4