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Inventories
3 Months Ended
Mar. 31, 2013
Inventory Disclosure [Abstract]  
Inventories
Inventories
Inventories consisted of the following:
 
March 31, 2013
 
December 31, 2012
 
(Dollars in millions)
Materials and supplies
$
156.8

 
$
157.6

Raw coal
125.3

 
164.3

Saleable coal
283.9

 
226.5

Total
$
566.0

 
$
548.4