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Inventories (Tables)
6 Months Ended
Jun. 30, 2014
Inventory Disclosure [Abstract]  
Inventories
Inventories as of June 30, 2014 and December 31, 2013 consisted of the following:
 
June 30, 2014
 
December 31, 2013
 
(Dollars in millions)
Materials and supplies
$
166.3

 
$
166.8

Raw coal
141.5

 
122.6

Saleable coal
240.6

 
217.3

Total
$
548.4

 
$
506.7