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Inventories (Tables)
9 Months Ended
Sep. 30, 2018
Inventory Disclosure [Abstract]  
Inventories
Inventories as of September 30, 2018 and December 31, 2017 consisted of the following:
 
September 30, 2018
 
December 31, 2017
 
(Dollars in millions)
Materials and supplies
$
104.3

 
$
101.5

Raw coal
57.5

 
78.1

Saleable coal
115.3

 
111.7

Total
$
277.1

 
$
291.3