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Inventories (Tables)
12 Months Ended
Dec. 31, 2022
Inventory Disclosure [Abstract]  
Inventories
Inventories as of December 31, 2022 and 2021 consisted of the following:
December 31,
 20222021
 (Dollars in millions)
Materials and supplies, net$130.8 $102.1 
Raw coal98.3 54.6 
Saleable coal67.0 70.0 
Inventories, net$296.1 $226.7