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Inventories (Tables)
6 Months Ended
Jun. 30, 2020
Inventory, Net [Abstract]  
Schedule of Inventories
Inventories consist of the following:
June 30, 2020
December 31, 2019
Raw materials$81.8  $101.3  
Work-in-process32.2  44.1  
Finished goods26.1  34.3  
Operating and other supplies134.9  140.9  
Total inventories$275.0  $320.6