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Inventories (Tables)
9 Months Ended
Sep. 30, 2020
Inventory Disclosure [Abstract]  
Schedule of Inventories by Major Class The following schedule details inventories by major class ($ in millions):
September 30,
2020
December 31,
2019
Raw materials$66.5 $61.1 
Work in process24.8 20.7 
Finished goods71.1 65.3 
Supplies and other10.4 14.3 
Total$172.8 $161.4