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Inventories (Tables)
 12 Months Ended
Dec. 31, 2022
Inventory Disclosure [Abstract]  
Components of inventories These components of inventories, net of lower of cost or net realizable value adjustments of $2.6 million, were as follows:
 December 31,
 20222021
 (Dollars in millions)
Coal$109.4 $63.5 
Coke14.3 16.6 
Materials, supplies and other51.5 46.9 
Total inventories$175.2 $127.0