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Inventories (Tables)
12 Months Ended
Dec. 31, 2021
Inventory Disclosure [Abstract]  
Schedule of Inventories by Major Class The following schedule details inventories by major class ($ in millions):
December 31,
20212020
Raw materials$113.4 $65.3 
Work in process41.9 23.2 
Finished goods95.7 83.5 
Supplies and other8.5 7.7 
Inventories$259.5 $179.7