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Inventories
6 Months Ended
Jun. 30, 2011
Inventories [Abstract]  
Inventories
(4) Inventories
     Inventories consisted of the following:
                 
    June 30,     December 31,  
    2011     2010  
    (Dollars in millions)  
Materials and supplies
  $ 109.7     $ 97.1  
Raw coal
    72.7       55.4  
Saleable coal
    191.6       180.4  
 
           
Total
  $ 374.0     $ 332.9