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Inventories (Tables)
9 Months Ended
Sep. 30, 2021
Inventory Disclosure [Abstract]  
Schedule of Inventories by Major Class The following schedule details inventories by major class ($ in millions):
September 30,
2021
December 31,
2020
Raw materials$113.8 $65.3 
Work in process43.4 23.2 
Finished goods95.7 83.5 
Supplies and other8.4 7.7 
Total$261.3 $179.7