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Inventories (Tables)
9 Months Ended
Sep. 30, 2024
Inventory Disclosure [Abstract]  
Schedule of Components of Inventories
The components of inventories were as follows:
September 30, 2024December 31, 2023
 
(Dollars in millions)
Coal$119.0 $107.7 
Coke18.0 17.4 
Materials, supplies and other58.9 57.5 
Total inventories$195.9 $182.6