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Revenue by Geographic Area, Major Customers and Segment Information
 12 Months Ended
Dec. 31, 2012
Revenue by Geographic Area, Major Customers and Segment Information  
Revenue by Geographic Area, Major Customers and Segment Information
19. 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), follows (in millions):
Years Ended December 31,
2012
2011
2010
United States
$ 1,584.2 $ 1,322.7 $ 1,487.5
Foreign:
Japan
183.7 200.0 199.7
Other
150.2 149.1 348.2
333.9 349.1 547.9
Total revenue
$ 1,918.1 $ 1,671.8 $ 2,035.4


In 2012, USEC's 10 largest customers in the LEU segment represented 68% of total revenue and USEC's three largest customers in the LEU segment represented 46% of total revenue. Revenue from Energy Northwest represented approximately 20% of total revenue in 2012. In 2012, 2011 and 2010, revenue from Exelon Corporation and in 2010, revenue from Entergy Corporation and from U.S. government contracts, each represented between 10% and 15% of total revenue. No other customer represented more than 10% of total revenue in 2012, 2011 or 2010.

USEC has two reportable segments: the LEU segment with two components, 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 2012, 2011 and 2010 and have been eliminated in consolidation.

Years Ended December 31,
2012
2011
2010
(millions)
Revenue
LEU segment:
Separative work units
$ 1,821.8 $ 1,330.9 $ 1,521.4
Uranium
26.0 131.8 236.1
1,847.8 1,462.7 1,757.5
Contract services segment
70.3 209.1 277.9
Revenue
$ 1,918.1 $ 1,671.8 $ 2,035.4
Segment Gross Profit
LEU segment
$ 129.3 $ 71.6 $ 134.3
Contract services segment
8.7 12.6 24.1
Gross profit
$ 138.0 $ 84.2 $ 158.4



December 31,
2012
2011
2010
(millions)
Assets
LEU segment
$ 2,208.5 $ 3,491.4 $ 3,760.6
Contract services segment
57.9 57.9 87.6
$ 2,266.4 $ 3,549.3 $ 3,848.2

USEC's long-term or long-lived assets include property, plant and equipment and other assets reported on the balance sheet at December 31, 2012, all of which were located in the United States.