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Inventories (Tables)
9 Months Ended
Sep. 30, 2020
Inventory Disclosure [Abstract]  
Schedule of Inventories
Inventories as of September 30, 2020 and December 31, 2019 consisted of the following:
September 30, 2020December 31, 2019
 (Dollars in millions)
Materials and supplies$108.0 $116.3 
Raw coal73.5 85.1 
Saleable coal138.2 130.1 
Total$319.7 $331.5