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Segment Information (Tables) | 12 Months Ended
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Dec. 31, 2013
Segment Reporting Information, Revenue for Reportable Segment [Abstract] |
Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area [Table Text Block] | 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 |
Segment Reporting Information |
| 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 |

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- Definition Tabular disclosure of the names of foreign countries from which revenue is material and the amount of revenue from external customers attributed to those countries. An entity may also provide subtotals of geographic information about groups of countries. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e9038-108599 + Details
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- Definition Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8721-108599 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8813-108599 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 Reference 4: 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 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8736-108599 + Details
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