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Stockholders' Equity | 12 Months Ended
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Dec. 31, 2012
Stockholders' Equity [Abstract] |
Stockholders' Equity | 15. STOCKHOLDERS' EQUITY Common Stock Changes in the number of shares of common stock outstanding follow (in thousands):
|  | Shares Issued |  |  | Treasury Stock |  |  | Shares Outstanding |
Balance at December 31, 2009 |  |  | 123,320 |  |  |  | (9,926 | ) |  |  | 113,394 |
Common stock issued |  |  | - |  |  |  | 1,836 |  |  |  | 1,836 |
Balance at December 31, 2010 |  |  | 123,320 |  |  |  | (8,090 | ) |  |  | 115,230 |
Common stock issued |  |  | 6,953 - |  |  |  | 1,008 |  |  |  | 7,961 |
Balance at December 31, 2011 |  |  | 130,273 |  |  |  | (7,082 | ) |  |  | 123,191 |
Common stock issued |  |  | - |  |  |  | 2,012 |  |  |  | 2,012 |
Balance at December 31, 2012 |  |  | 130,273 |  |  |  | (5,070 | ) |  |  | 125,203 |
Preferred Stock Purchase Rights On September 30, 2011, the Board of Directors adopted a tax benefit preservation plan to help preserve the value of certain deferred tax benefits, including those generated by net operating losses and net unrealized built-in losses. The tax benefit preservation plan was approved by USEC's shareholders on April 26, 2012. USEC's ability to use these tax benefits would be substantially limited if it were to experience an "ownership change" as defined under Section 382 of the Internal Revenue Code. Holders of USEC's common stock of record on October 10, 2011 received rights that initially trade together with USEC's common stock and are not exercisable. Effective September 30, 2011, the plan, subject to limited exceptions, provides that any stockholder or group that acquires beneficial ownership of 4.9 percent or more of USEC's securities without the approval of the Board of Directors would be subject to significant dilution of its holdings. In addition, subject to limited exceptions, any existing 4.9 percent or greater stockholder that acquires beneficial ownership of any additional shares of USEC's securities without the approval of the Board of Directors would also be subject to dilution. In both cases, such person would be deemed to be an "acquiring person" for purposes of the tax plan. The dilution features of the tax plan are designed to reduce the likelihood that USEC experiences an ownership change by discouraging acquisitions that would impact the ownership change analysis for purposes of Section 382. If a person becomes an acquiring person, then, subject to certain exceptions, the preferred stock purchase rights would separate from the common stock and common stock equivalents and become exercisable for USEC's common stock or other securities or assets having a market value equal to twice the exercise price of the right. The Board of Directors has established procedures to consider requests to exempt certain acquisitions of the company's securities from the plan if the Board determines that doing so would not limit or impair the availability of the tax benefits or is otherwise in the best interests of the company. Convertible Preferred Stock and Common Stock Warrants Refer to Note 10 regarding the investment in USEC by Toshiba and B&W. In the first phase closing on September 2, 2010, USEC received $75 million and the investors in aggregate received 75,000 shares of Series B-1 12.75% Convertible Preferred Stock, par value $1.00 per share and warrants to purchase 6.25 million shares of Class B Common Stock, par value $.10 per share, at an exercise price of $7.50 per share. The creation of the Class B Common Stock will require the approval of USEC's stockholders, so the warrants will, in lieu thereof, until such stockholder approval has been obtained, be exercisable for 6,250 shares of a newly created Series C Convertible Participating Preferred Stock, par value $1.00 per share, at an exercise price of $7,500.00 per share. The warrants are exercisable at any time from January 1, 2015 to December 31, 2016. If, at the time the warrants are exercised, the approvals for the creation of the Class B Common have not been obtained, the warrants will be exercisable for shares of Series C Convertible Participating Preferred Stock.

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- Definition The entire disclosure for shareholders' equity, comprised of portions attributable to the parent entity and noncontrolling interest, if any, including other comprehensive income (as applicable). Including, but not limited to: (1) balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings; (2) accumulated balance for each classification of other comprehensive income and total amount of comprehensive income; (3) amount and nature of changes in separate accounts, including the number of shares authorized and outstanding, number of shares issued upon exercise and conversion, and for other comprehensive income, the adjustments for reclassifications to net income; (4) rights and privileges of each class of stock authorized; (5) basis of treasury stock, if other than cost, and amounts paid and accounting treatment for treasury stock purchased significantly in excess of market; (6) dividends paid or payable per share and in the aggregate for each class of stock for each period presented; (7) dividend restrictions and accumulated preferred dividends in arrears (in aggregate and per share amount); (8) retained earnings appropriations or restrictions, such as dividend restrictions; (9) impact of change in accounting principle, initial adoption of new accounting principle and correction of an error in previously issued financial statements; (10) shares held in trust for Employee Stock Ownership Plan (ESOP); (11) deferred compensation related to issuance of capital stock; (12) note received for issuance of stock; (13) unamortized discount on shares; (14) description, terms, and number of warrants or rights outstanding; (15) shares under subscription and subscription receivables, effective date of new retained earnings after quasi-reorganization and deficit eliminated by quasi-reorganization and, for a period of at least ten years after the effective date, the point in time from which the new retained dates; and (16) retroactive effective of subsequent change in capital structure. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21488-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30, 31 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 4 -Section E Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Preferred Stock -URI http://asc.fasb.org/extlink&oid=6521494 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21564-112644 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SAB TOPIC 4.C) -URI http://asc.fasb.org/extlink&oid=6959260&loc=d3e187143-122770 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21484-112644 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644 Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21506-112644 Reference 11: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6405834&loc=d3e23285-112656 Reference 12: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 43 -Section B -Paragraph 7, 11A -Chapter 1 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. 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