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Inventories
 9 Months Ended
Sep. 30, 2021
Inventory Disclosure [Abstract]  
Inventories Inventories
Inventories as of September 30, 2021 and December 31, 2020 consisted of the following:
September 30, 2021December 31, 2020
 (Dollars in millions)
Materials and supplies$98.3 $102.6 
Raw coal53.5 70.5 
Saleable coal72.7 88.5 
Total$224.5 $261.6 
Materials and supplies inventories presented above have been shown net of reserves of $9.8 million and $10.4 million as of September 30, 2021 and December 31, 2020, respectively.