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Inventories (Tables)
6 Months Ended
Jun. 30, 2022
Inventory Disclosure [Abstract]  
Components of Inventories
The components of inventories were as follows:
June 30, 2022December 31, 2021
 
(Dollars in millions)
Coal$120.7 $63.5 
Coke21.2 16.6 
Materials, supplies and other51.2 46.9 
Total inventories$193.1 $127.0