XML 50 R33.htm IDEA: XBRL DOCUMENT v3.20.2
Inventories (Tables)
6 Months Ended
Jun. 30, 2020
Inventory Disclosure [Abstract]  
Inventories
Inventories as of June 30, 2020 and December 31, 2019 consisted of the following:
June 30, 2020December 31, 2019
 (Dollars in millions)
Materials and supplies$111.2  $116.3  
Raw coal49.7  85.1  
Saleable coal140.7  130.1  
Total$301.6  $331.5