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Inventories (Tables)
12 Months Ended
Dec. 31, 2011
Inventories  
Schedule of Inventories
   
December 31,
 
   
2011
   
2010
 
   
(millions)
 
Current assets:
           
Separative work units
  $ 1,048.6     $ 947.4  
Uranium
    690.0       562.5  
Materials and supplies
    13.4       12.6  
      1,752.0       1,522.5  
Current liabilities:
               
Inventories owed to customers and suppliers
    (870.1 )     (715.8 )
Inventories, net
  $ 881.9     $ 806.7