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Inventories (Tables)
3 Months Ended
Apr. 02, 2021
Inventory Disclosure [Abstract]  
Schedule of Inventory
The classes of inventory are summarized as follows ($ in millions):
April 2, 2021December 31, 2020
Finished goods$236.1 $219.0 
Work in process37.1 39.8 
Raw materials96.0 93.7 
Reserve for inventory obsolescence(86.0)(85.6)
Total$283.2 $266.9