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Inventories
9 Months Ended
Sep. 30, 2023
Inventory Disclosure [Abstract]  
Inventories
2. Inventories
The components of inventories were as follows:
September 30, 2023December 31, 2022
 
(Dollars in millions)
Coal$127.8 $109.4 
Coke21.5 14.3 
Materials, supplies and other57.5 51.5 
Total inventories$206.8 $175.2