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Inventories
 3 Months Ended
Mar. 31, 2023
Inventory Disclosure [Abstract]  
Inventories Inventories
“Inventories, net” as of March 31, 2023 and December 31, 2022 consisted of the following:
March 31, 2023December 31, 2022
 (Dollars in millions)
Materials and supplies, net$145.5 $130.8 
Raw coal83.5 98.3 
Saleable coal102.5 67.0 
Inventories, net$331.5 $296.1 
Materials and supplies inventories, net presented above have been shown net of reserves of $9.4 million and $9.5 million as of March 31, 2023 and December 31, 2022.