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Inventories (Tables)
9 Months Ended
Oct. 01, 2021
Inventory Disclosure [Abstract]  
Schedule of Inventory
The classes of inventory are summarized as follows ($ in millions):
October 1, 2021December 31, 2020
Finished goods$232.3 $179.3 
Work in process21.1 25.3 
Raw materials82.0 71.8 
Reserve for inventory obsolescence(61.1)(60.4)
Total$274.3 $216.0