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Segment Information
 12 Months Ended
Dec. 31, 2013
Segment Reporting Information, Revenue for Reportable Segment [Abstract]  
Segment Information
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,
 
2013
 
2012
 
2011
United States
$
1,024.4

 
$
1,538.0

 
$
1,259.3

Foreign:
 
 
 
 
 
Japan
105.6

 
182.1

 
199.7

Other
177.5

 
142.0

 
141.8

 
283.1

 
324.1

 
341.5

Total revenue
$
1,307.5

 
$
1,862.1

 
$
1,600.8


In 2013, our 10 largest customers represented 69% of total revenue and our three largest customers represented 37% of total revenue. Revenue from Energy Northwest represented approximately 20% of total revenue in 2013 and 2012. In 2012 and 2011, revenue from Exelon Corporation represented approximately 15% of total revenue. No other customer represented more than 10% of total revenue in 2013, 2012 or 2011.
        
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 consists of work performed for DOE and DOE contractors at the Portsmouth site and the Paducah GDP.  The contract services segment formerly included nuclear energy services and technologies provided by NAC International Inc. Refer to Note 3 regarding the sale of NAC in March 2013 and results of operations for NAC. Gross profit is USEC’s measure for segment reporting. There were no intersegment sales in the periods presented.

 
Years Ended December 31,
 
2013
 
2012
 
2011
 
(millions)
Revenue
 
 
 
 
 
LEU segment:
 
 
 
 
 
Separative work units
$
1,222.9

 
$
1,821.8

 
$
1,330.9

Uranium
71.2

 
26.0

 
131.8

 
1,294.1

 
1,847.8

 
1,462.7

Contract services segment
13.4

 
14.3

 
138.1

Revenue
$
1,307.5

 
$
1,862.1

 
$
1,600.8

 
 
 
 
 
 
Segment Gross Profit (Loss)
 
 
 
 
 
LEU segment
$
(94.7
)
 
$
129.3

 
$
71.6

Contract services segment
(0.2
)
 
0.1

 
3.8

Gross profit (loss)
$
(94.9
)
 
$
129.4

 
$
75.4



 
December 31,
 
2013
 
2012
 
2011
 
(millions)
Assets
 
 
 
 
 
LEU segment
$
1,646.0

 
$
2,208.5

 
$
3,491.4

Contract services segment:
 
 
 
 
 
NAC (divested March 2013)
—

 
15.6

 
20.1

Other
59.5

 
42.3

 
37.8

Contract services segment
59.5

 
57.9

 
57.9

 
$
1,705.5

 
$
2,266.4


$
3,549.3



USEC’s long-term or long-lived assets include property, plant and equipment and other assets reported on the balance sheet at December 31, 2013, all of which were located in the United States.