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Inventories (Tables)
 6 Months Ended
Jun. 30, 2023
Inventory Disclosure [Abstract]  
Schedule of Inventories Inventories, net” as of June 30, 2023 and December 31, 2022 consisted of the following:
June 30, 2023December 31, 2022
 (Dollars in millions)
Materials and supplies, net$152.0 $130.8 
Raw coal94.2 98.3 
Saleable coal66.7 67.0 
Inventories, net$312.9 $296.1