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Accounts Receivable and Other Current Assets
 12 Months Ended
Dec. 31, 2011
Accounts Receivable and Other Current Assets  
Accounts Receivable and Other Current Assets
2.  ACCOUNTS RECEIVABLE AND OTHER CURRENT ASSETS
   
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  

   
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  

 
(1)  
Accounts receivable are net of valuation allowances and allowances for doubtful accounts totaling $13.7 million at December 31, 2011 and $18.6 million at December 31, 2010.
 
(2)  
Billings for contract services related to DOE are invoiced based on provisional billing rates approved by DOE. Unbilled revenue represents the difference between actual costs incurred, prior to DCAA audit and notice by DOE authorizing final billing, and provisional billing rate invoiced amounts. USEC expects to invoice and collect the unbilled amounts as billing rates are revised, submitted to and approved by DOE.