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INVENTORIES (Tables)
12 Months Ended
Dec. 31, 2021
Inventory Disclosure [Abstract]  
Inventories
December 31,
20212020
($ in millions)
Supplies$115.6 $113.8 
Raw materials180.7 116.3 
Work in process155.2 133.2 
Finished goods523.3 359.6 
974.8 722.9 
LIFO reserve(106.5)(48.2)
Inventories, net$868.3 $674.7