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Inventories
12 Months Ended
Dec. 31, 2021
Inventory Disclosure [Abstract]  
Inventories INVENTORIES
The classes of inventory as of December 31 are summarized as follows ($ in millions):
20212020
Finished goods$214.3 $179.3 
Work in process22.0 25.3 
Raw materials88.3 71.8 
Reserve for inventory obsolescence(60.8)(60.4)
Total$263.8 $216.0