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Inventories (Tables)
9 Months Ended
Sep. 30, 2022
Inventory Disclosure [Abstract]  
Schedule of Inventories Inventories, net” as of September 30, 2022 and December 31, 2021 consisted of the following:
September 30, 2022December 31, 2021
 (Dollars in millions)
Materials and supplies, net$121.7 $102.1 
Raw coal58.5 54.6 
Saleable coal97.2 70.0 
Inventories, net$277.4 $226.7