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Inventories (Tables)
9 Months Ended
Sep. 30, 2016
Inventory Disclosure [Abstract]  
Inventories
Inventories as of September 30, 2016 and December 31, 2015 consisted of the following:
 
September 30, 2016
 
December 31, 2015
 
(Dollars in millions)
Materials and supplies
$
110.7

 
$
115.9

Raw coal
53.0

 
75.9

Saleable coal
95.9

 
116.0

Total
$
259.6

 
$
307.8