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Inventories (Tables)
12 Months Ended
Dec. 31, 2023
Inventory Disclosure [Abstract]  
Inventories Inventories, net” as of December 31, 2023 and 2022 consisted of the following:
December 31,
 20232022
 (Dollars in millions)
Materials and supplies, net$153.0 $130.8 
Raw coal105.6 98.3 
Saleable coal93.2 67.0 
Inventories, net$351.8 $296.1