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Inventories (Tables)
6 Months Ended
Jun. 30, 2011
Inventories  
Schedule of Inventories
   
June 30,
2011
   
December 31,
2010
 
   
(millions)
 
Current assets:
           
Separative work units    
  $ 914.2     $ 947.4  
Uranium       
    790.5       562.5  
Materials and supplies   
    12.5       12.6  
      1,717.2       1,522.5  
Current liabilities:
               
Inventories owed to customers and suppliers
    (1,084.4 )     (715.8 )
Inventories, net
  $ 632.8     $ 806.7