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Accounts Receivable
 6 Months Ended
Jun. 30, 2011
Accounts Receivable  
Accounts Receivable
2.  ACCOUNTS RECEIVABLE
   
June 30,
2011
    
December 31,
2010
  
   
(millions)
  
Accounts receivable (1):
      
Utility customers:
            
Trade receivables
  $ 39.1     $ 249.1  
Uranium loaned to customer (2)
    41.2       -  
Unbilled revenue (3)
    0.3       0.4  
      80.6       249.5  
Contract services, primarily Department of Energy (4):
                
Billed revenue
    17.8       34.8  
Unbilled revenue
    35.6       24.3  
      53.4       59.1  
    $ 134.0     $ 308.6  

 
(1)  
Accounts receivable are net of valuation allowances and allowances for doubtful accounts totaling $17.8 million at June 30, 2011 and $18.6 million at December 31, 2010.
 
(2)  
The loan period for the investment grade-rated utility customer ends in the third quarter of 2011.
 
(3)  
Unbilled revenue for utility customers represents price adjustments for past deliveries that are not yet billable under the applicable contracts.
 
(4)  
Billings for contract services related to the U.S. Department of Energy ("DOE") are invoiced based on provisional billing rates approved by DOE. Unbilled revenue represents the difference between actual costs incurred, prior to incurred cost 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.