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Revenue by Geographic Area, Major Customers and Segment Information
 12 Months Ended
Dec. 31, 2011
Revenue by Geographic Area, Major Customers and Segment Information  
Revenue by Geographic Area, Major Customers and Segment Information
17.  REVENUE BY GEOGRAPHIC AREA, MAJOR CUSTOMERS AND SEGMENT INFORMATION

Revenue attributed to domestic and foreign customers, including customers in a foreign country representing 10% or more of total revenue (Japan in 2011 and 2009), follows (in millions):
 
   
Years Ended December 31,
  
   
2011
    
2010
    
2009
  
United States
  $ 1,322.7     $ 1,487.5     $ 1,402.2  
Foreign:
                        
Japan
    200.0       199.7       305.0  
Other
    149.1       348.2       329.6  
      349.1       547.9       634.6  
    $ 1,671.8     $ 2,035.4     $ 2,036.8  

In 2011, USEC's 10 largest customers in the LEU segment represented 55% of total revenue and USEC's three largest customers in the LEU segment represented 26% of total revenue. In 2011, 2010 and 2009, revenue from Exelon Corporation and in 2010, revenue from Entergy Corporation and from U.S. government contracts, each represented more than 10%, but less than 15%, of total revenue. No other customer represented more than 10% of total revenue in 2011, 2010 or 2009.

USEC has two reportable segments: the low enriched uranium ("LEU") segment with two components, separative work units ("SWU") and uranium, and the contract services segment.  The LEU segment is USEC's primary business focus and includes sales of the SWU component of LEU, sales of both the SWU and uranium components of LEU, and sales of uranium. The contract services segment includes work performed for DOE and DOE contractors at the Portsmouth site and the Paducah GDP as well as nuclear energy services and technologies provided by NAC International Inc. Gross profit is USEC's measure for segment reporting. Intersegment sales were less than $0.1 million in each of 2011, 2010 and 2009 and have been eliminated in consolidation.
 
   
Years Ended December 31,
  
   
2011
    
2010
    
2009
  
   
(millions)
  
Revenue
                  
LEU segment:
                  
Separative work units                                                                   
   $ 1,330.9     $ 1,521.4     $ 1,647.0  
Uranium                                                                   
     131.8       236.1       180.7  
      1,462.7       1,757.5       1,827.7  
Contract services segment                                                                       
     209.1       277.9       209.1  
    $ 1,671.8     $ 2,035.4     $ 2,036.8  
                         
Segment Gross Profit
                        
LEU segment                                                                       
   $ 71.6     $ 134.3     $ 187.4  
Contract services segment                                                                       
     12.6       24.1       17.3  
Gross profit                                                                   
     84.2       158.4       204.7  
Special charges                                                                       
     -       -       4.1  
Advanced technology costs                                                                       
     273.2       110.2       118.4  
Selling, general, and administrative                                                                       
     62.1       58.9       58.8  
Other (income)                                                                       
     (3.7 )     (44.4 )     (70.7 )
Operating income (loss)                                                                       
     (247.4 )     33.7       94.1  
Interest expense (income) and issuance costs, net
     11.1       6.8       (0.1 )
Income (loss) before income taxes                                                                       
   $ (258.5 )   $ 26.9     $ 94.2  

   
December 31,
  
   
2011
    
2010
    
2009
  
   
(millions)
  
Assets
                  
LEU segment                                                                       
   $ 3,491.4     $ 3,760.6     $ 3,444.9  
Contract services segment                                                                       
     57.9       87.6       87.2  
    $ 3,549.3     $ 3,848.2     $ 3,532.1  


USEC's long-term or long-lived assets include property, plant and equipment and other assets reported on the balance sheet at December 31, 2011, all of which were located in the United States.