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Segment Information | 12 Months Ended
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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.

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- Definition The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8380-108599 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8933-108599 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8538-108599 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 26 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8844-108599 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 29 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8864-108599 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 34 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8981-108599 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 35 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8984-108599 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e9038-108599 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8906-108599 Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 42 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e9054-108599 Reference 11: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 31 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8924-108599 Reference 12: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 40 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e9031-108599 Reference 13: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8971-108599 Reference 14: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8595-108599 + Details
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