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Inventories (Tables)
3 Months Ended
Mar. 31, 2022
Inventory Disclosure [Abstract]  
Schedule of Inventories by Major Class The following schedule details inventories by major class ($ in millions):
March 31,
2022
December 31,
2021
Raw materials$119.5 $113.4 
Work in process44.6 41.9 
Finished goods99.0 95.7 
Supplies and other9.3 8.5 
Total$272.4 $259.5