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Inventories (Tables)
12 Months Ended
Dec. 31, 2021
Inventory Disclosure [Abstract]  
Schedule of inventory classes The classes of inventory as of December 31 are summarized as follows ($ in millions):
20212020
Finished goods$215.4 $227.9 
Work in process94.0 75.2 
Raw materials203.3 152.4 
Total$512.7 $455.5