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Accounts Receivable (Tables)
 12 Months Ended
Dec. 31, 2011
Accounts Receivable and Other Current Assets  
Schedule of Accounts Receivable
   
December 31,
 
   
2011
    
2010
  
   
(millions)
  
Accounts receivable (1):
      
Utility customers                    
   $ 124.2     $ 249.5  
Contract services, primarily Department of Energy (2):
                
Billed revenue      
     18.8       34.8  
Unbilled revenue       
     19.0       24.3  
      37.8       59.1  
    $ 162.0     $ 308.6  
Schedule of Other Current Assets
   
December 31,
 
   
2011
    
2010
  
   
(millions)
  
Other current assets:
            
      Prepayments to American Centrifuge suppliers   
   $ 21.1     $ 34.4  
      Prepaid taxes, power purchases and insurance  
     29.4       21.0  
      Deferred financing costs for credit facility 
     2.4       7.4  
      Other            
     11.9       8.8  
    $ 64.8     $ 71.6