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INVENTORIES (Tables)
12 Months Ended
Dec. 31, 2020
Inventory Disclosure [Abstract]  
Inventories
December 31,
20202019
($ in millions)
Supplies$113.8 $105.6 
Raw materials116.3 69.2 
Work in process133.2 120.9 
Finished goods359.6 449.5 
722.9 745.2 
LIFO reserve(48.2)(49.5)
Inventories, net$674.7 $695.7