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Inventories
9 Months Ended
Sep. 30, 2024
Inventory Disclosure [Abstract]  
Inventories Inventories
Inventories are valued at the lower of cost (on a first-in, first-out basis) or net realizable value. Inventory balances were as follows:
($ in millions)September 30,
2024
December 31,
2023
Raw materials$170.3 $172.3 
Work in process80.0 87.3 
Finished goods150.9 175.1 
 $401.2 $434.7