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Segment Information
 12 Months Ended
Dec. 31, 2016
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, follows (in millions):
 
Year Ended December 31,
 
2016
 
2015
United States
$
242.8

 
$
272.8

Foreign:
 
 
 
Japan
49.1

 
77.8

Belgium
*

 
55.5

Other
19.4

 
12.1

 
68.5

 
145.4

Total revenue
$
311.3

 
$
418.2

 
 
 
 
* less than 10%
 
 
 


In 2016, our 10 largest customers represented approximately 90% of total revenue and our four largest customers represented approximately 50% of total revenue. In our LEU segment, revenue from Exelon Corporation, South Carolina Electric & Gas and American Electric Power represented approximately 15%, 12% and 11%, respectively, of total revenue in 2016. In 2015, revenue from Exelon Corporation, Synatom S.A. and Kansai Electric Power Co., Inc. represented approximately 25%, 13%, and 10%, respectively, of total revenue. In our contract services segment, the U.S. government and its contractors represented approximately 12% of total revenue in 2016 and 15% of total revenue in 2015. No other customer represented more than 10% of total revenue in 2016 or 2015.

Centrus has two reportable segments: the LEU segment with two components, SWU and uranium, and the contract services segment. The LEU segment 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 revenue and cost of sales for work that Centrus performs as a contractor to UT-Battelle. The contract services segment also includes limited services provided by Centrus to DOE and its contractors at the Portsmouth site related to facilities we continue to lease for the American Centrifuge Plant and formerly at the Paducah GDP. Gross profit is Centrus’ measure for segment reporting. There were no intersegment sales in the periods presented.
 
Year Ended December 31,
(in millions)
2016
 
2015
 
 
 
 
Revenue
 
 
 
LEU segment:
 
 
 
Separative work units
$
258.5

 
$
289.9

Uranium
14.3

 
65.5

 
272.8

 
355.4

Contract services segment
38.5

 
62.8

Revenue
$
311.3

 
$
418.2

 
 
 
 
Segment Gross Profit
 
 
 
LEU segment
$
38.5

 
$
70.1

Contract services segment
6.6

 
(1.2
)
Gross profit
$
45.1

 
$
68.9



 
December 31,
(in millions)
2016
 
2015
 
 
 
 
Assets
 
 
 
LEU segment
$
686.0

 
$
795.3

Contract services segment
27.5

 
24.8

 
$
713.5

 
$
820.1


Centrus’ long-term or long-lived assets include property, plant and equipment and other assets are reported on the balance sheet at December 31, 2016, all of which were located in the United States.