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Inventories (Tables)
6 Months Ended
Jun. 30, 2024
Inventory Disclosure [Abstract]  
Schedule of Inventories
“Inventories, net” as of June 30, 2024 and December 31, 2023 consisted of the following:
June 30, 2024December 31, 2023
 (Dollars in millions)
Materials and supplies, net$169.2 $153.0 
Raw coal122.6 105.6 
Saleable coal130.3 93.2 
Inventories, net$422.1 $351.8