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Inventories (Tables)
3 Months Ended
Mar. 31, 2014
Inventory Disclosure [Abstract]  
Inventories
Inventories as of March 31, 2014 and December 31, 2013 consisted of the following:
 
March 31, 2014
 
December 31, 2013
 
(Dollars in millions)
Materials and supplies
$
168.2

 
$
166.8

Raw coal
134.2

 
122.6

Saleable coal
247.0

 
217.3

Total
$
549.4

 
$
506.7