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Inventories (Tables)
3 Months Ended
Mar. 31, 2015
Inventory Disclosure [Abstract]  
Inventories
Inventories as of March 31, 2015 and December 31, 2014 consisted of the following:
 
March 31, 2015
 
December 31, 2014
 
(Dollars in millions)
Materials and supplies
$
137.1

 
$
143.6

Raw coal
76.1

 
115.0

Saleable coal
156.3

 
147.9

Total
$
369.5

 
$
406.5