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Inventories
9 Months Ended
Sep. 30, 2020
Inventory Disclosure [Abstract]  
Inventories
3. Inventories
The components of inventories were as follows:
September 30, 2020December 31, 2019
 
(Dollars in millions)
Coal$71.6 $94.4 
Coke11.7 8.1 
Materials, supplies and other46.4 44.5 
Total inventories$129.7 $147.0