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Inventories
 3 Months Ended
Mar. 31, 2024
Inventory Disclosure [Abstract]  
Inventories Inventories
“Inventories, net” as of March 31, 2024 and December 31, 2023 consisted of the following:
March 31, 2024December 31, 2023
 (Dollars in millions)
Materials and supplies, net$161.4 $153.0 
Raw coal125.8 105.6 
Saleable coal117.1 93.2 
Inventories, net$404.3 $351.8 
Materials and supplies inventories, net presented above have been shown net of reserves of $6.4 million and $7.2 million as of March 31, 2024 and December 31, 2023, respectively.