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Inventories
9 Months Ended
Sep. 30, 2013
Inventory Disclosure [Abstract]  
Inventories
Inventories
Inventories consisted of the following:
 
September 30, 2013
 
December 31, 2012
 
(Dollars in millions)
Materials and supplies
$
166.2

 
$
157.6

Raw coal
126.7

 
164.3

Saleable coal
270.3

 
226.5

Total
$
563.2

 
$
548.4