Basis of Presentation	6 Months Ended
Jun. 30, 2013
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	BASIS OF PRESENTATION The unaudited consolidated condensed financial statements as of and for the three and six months ended June 30, 2013 and 2012 have been prepared pursuant to the rules and regulations of the Securities and Exchange Commission. The unaudited consolidated condensed financial statements reflect all adjustments which are, in the opinion of management, necessary for a fair statement of the financial results for the interim period. Certain information and notes normally included in financial statements prepared in accordance with generally accepted accounting principles in the United States (“GAAP”) have been omitted pursuant to such rules and regulations. Certain amounts in the consolidated condensed financial statements have been reclassified to conform to the current presentation. Operating results for the three and six months ended June 30, 2013 are not necessarily indicative of the results that may be expected for the year ending December 31, 2013. The unaudited consolidated condensed financial statements should be read in conjunction with the consolidated financial statements and related notes and management's discussion and analysis of financial condition and results of operations included in the annual report on Form 10-K for the year ended December 31, 2012. Reverse Stock Split On July 1, 2013, USEC effectuated a reverse stock split of 1-for-25 shares as described below, resulting in a reclassification from Common Stock to Excess of Capital over Par Value of $12.5 million. Liquidity Risks and Uncertainties USEC's consolidated condensed financial statements have been prepared assuming that USEC will continue as a going concern, which contemplates the realization of assets and the satisfaction of liabilities in the normal course of business for the 12-month period following the date of these financial statements. USEC reported a net loss of $1.2 billion in the year ended December 31, 2012 and a net loss of $491.1 million in the year ended December 31, 2011. These net losses were primarily the result of expenses related to the development of the American Centrifuge project, including the expense of previously capitalized amounts during both periods and related tax valuation allowances. USEC reported a net loss of $42.9 million for the six months ended June 30, 2013 and cash and cash equivalents of $194.7 million as of June 30, 2013. USEC expects that its cash balance, internally generated cash from its ongoing operations, and available borrowings under its revolving credit facility will provide sufficient cash to meet its obligations as they become due for at least 12 months from the date of the financial statements, assuming the renewal or replacement of its revolving credit facility past September 2013 and depending on the level of American Centrifuge expenditures after the conclusion of the research, development and demonstration (“RD&D”) program which is scheduled to be completed by December 31, 2013. USEC's credit facility is available to finance working capital needs and general corporate purposes. On March 14, 2013, USEC amended its credit facility, among other things, to extend the expiration date of the credit facility from May 31, 2013 to September 30, 2013. USEC repaid its existing term loan in connection with the amendment. USEC expects to renew or replace its credit facility at or prior to maturity either as part of a potential balance sheet restructuring (discussed below) or with another short term credit facility based on USEC's working capital needs. If USEC were unable to renew or replace its credit facility beyond September 2013, USEC would seek to work with customers, if needed, to effect further order movements to provide sufficient liquidity and working capital. Although USEC expects to have adequate liquidity to meet its obligations for at least 12 months, its $530 million of convertible senior notes mature on October 1, 2014. USEC's liquidity over the next 12 months is also dependent on the level of American Centrifuge expenditures after the conclusion of the RD&D program which is scheduled to be completed by December 31, 2013. In light of the significant transition of USEC's business and the uncertainties and challenges facing USEC and in order to address the convertible notes maturity and improve USEC's credit profile and its ability to successfully finance and deploy the American Centrifuge project and to maximize USEC's participation in such project, USEC is engaged with its advisors and certain stakeholders on alternatives for a possible restructuring of its balance sheet. Although USEC has no assurance regarding its ability to pursue or complete a restructuring, a restructuring could result in significant changes to the Company's capital structure and adjustments to its balance sheet, including the creation of a new entity for accounting purposes, which would have a material impact on USEC's financial statements, including the going concern assumption on which they have been prepared. Given the current enrichment market conditions and the challenges these conditions present for obtaining the capital necessary for commercialization of the American Centrifuge Plant (“ACP”), USEC is evaluating and pursuing the feasibility of alternatives and the actions necessary to proceed with the commercial deployment of the American Centrifuge technology including the availability of additional government support. USEC has no assurance that it will be successful in achieving any of these measures, including obtaining additional government support that may be necessary to successful commercial deployment, or the timing thereof. Therefore, USEC continues to evaluate its options concerning the American Centrifuge project including its ability to continue the project prior to or upon completion of the RD&D program, further demobilization of or delays in the commercial deployment of the project, and termination of the project. Any such actions may have a material adverse impact on USEC's ability to deploy the American Centrifuge technology, on its liquidity and on the long-term viability of its enrichment business. See Note 15, “American Centrifuge Plant” for additional information. In addition, on May 8, 2012, USEC received a notice from the New York Stock Exchange (“NYSE”) that the average closing price of its common stock was below the NYSE's continued listing criteria relating to minimum share price. On July 1, 2013, USEC effectuated a reverse stock split of 1-for-25 shares in order to regain compliance with the NYSE continued listing criteria related to minimum share price. This action resulted in USEC's closing share price exceeding $1.00 per share, and the condition will be deemed cured if the average closing price remains above the level for at least the following 30 trading days. However, on April 30, 2013, USEC received notice from the NYSE that the decline in USEC's total market capitalization has caused it to be out of compliance with another of the NYSE's continued listing standards. In accordance with the NYSE's rules, USEC submitted a plan advising the NYSE of definitive action it has taken, or is taking, that would bring it into conformity with the market capitalization listing standards within 18 months of receipt of the letter. On August 1, 2013, the NYSE accepted USEC's plan of compliance and USEC's common stock will continue to be listed on the NYSE during the 18-month cure period, subject to the compliance with other NYSE continued listing standards and continued periodic review by the NYSE of USEC's progress with respect to its plan. USEC's plan outlines initiatives USEC must execute by quarter. These initiatives include the successful completion of American Centrifuge plant development milestones, as well as the successful execution of the Company's Russian supply agreement and the Company's potential balance sheet restructuring. The NYSE has notified us that if USEC does not achieve these financial and operational goals, the Company will be subject to NYSE trading suspension at the point the initiative or goal is not met. Under the terms of USEC's convertible notes, a "fundamental change" is triggered if USEC's shares of common stock are not listed for trading on any of the NYSE, the American Stock Exchange (now NYSE-MKT), the NASDAQ Global Market or the NASDAQ Global Select Market, and the holders of the notes can require USEC to repurchase the notes at par for cash. USEC has no assurance that it would be eligible for listing on an alternate exchange in light of its market capitalization, stockholders' deficit and net losses. In the event a fundamental change under the convertible notes is triggered, USEC does not have adequate cash to repurchase the notes. A failure by USEC to offer to repurchase the notes or to repurchase the notes after the occurrence of a fundamental change is an event of default under the indenture governing the notes. The occurrence of a fundamental change under the convertible notes that permits the holders of the convertible notes to require a repurchase for cash is also an event of default under USEC's credit facility. See Note 15, “NYSE Listing Standards Notices” for additional information. USEC is in discussions with the Pension Benefit Guaranty Corporation (“PBGC”) regarding the impact of its de-lease of the Portsmouth gaseous diffusion plant ("GDP") and related transition of employees on its defined benefit plan funding obligations as well as the impact of ceasing enrichment at the Paducah GDP and related transition of employees as part of future reductions in force. See Note 15, “Potential ERISA Section 4062(e) Liability” for additional information. The above noted actions, as well as actions that may be taken by vendors, customers, creditors and other third parties in response to its actions or based on their view of its financial strength and future business prospects, could give rise to events that individually, or in the aggregate, impose significant demands on USEC's liquidity. New Accounting Standard In February 2013, the Financial Accounting Standards Board (“FASB”) issued guidance on the presentation of accumulated other comprehensive income (“AOCI”), adding new disclosure requirements for items reclassified out of AOCI. The new guidance does not amend any existing requirements for reporting net income or other comprehensive income in the financial statements. The implementation of the new guidance in 2013 is reflected in the notes to USEC’s consolidated condensed financial statements and did not have an effect on USEC’s results of operations, cash flows or financial position.

BASIS OF PRESENTATION

The unaudited consolidated condensed financial statements as of and for the three and six months ended June 30, 2013 and 2012 have been prepared pursuant to the rules and regulations of the Securities and Exchange Commission. The unaudited consolidated condensed financial statements reflect all adjustments which are, in the opinion of management, necessary for a fair statement of the financial results for the interim period. Certain information and notes normally included in financial statements prepared in accordance with generally accepted accounting principles in the United States (“GAAP”) have been omitted pursuant to such rules and regulations. Certain amounts in the consolidated condensed financial statements have been reclassified to conform to the current presentation.

Operating results for the three and six months ended June 30, 2013 are not necessarily indicative of the results that may be expected for the year ending December 31, 2013. The unaudited consolidated condensed financial statements should be read in conjunction with the consolidated financial statements and related notes and management's discussion and analysis of financial condition and results of operations included in the annual report on Form 10-K for the year ended December 31, 2012.

Reverse Stock Split

On July 1, 2013, USEC effectuated a reverse stock split of 1-for-25 shares as described below, resulting in a reclassification from Common Stock to Excess of Capital over Par Value of $12.5 million.

Liquidity Risks and Uncertainties

USEC's consolidated condensed financial statements have been prepared assuming that USEC will continue as a going concern, which contemplates the realization of assets and the satisfaction of liabilities in the normal course of business for the 12-month period following the date of these financial statements.

USEC reported a net loss of $1.2 billion in the year ended December 31, 2012 and a net loss of $491.1 million in the year ended December 31, 2011. These net losses were primarily the result of expenses related to the development of the American Centrifuge project, including the expense of previously capitalized amounts during both periods and related tax valuation allowances. USEC reported a net loss of $42.9 million for the six months ended June 30, 2013 and cash and cash equivalents of $194.7 million as of June 30, 2013. USEC expects that its cash balance, internally generated cash from its ongoing operations, and available borrowings under its revolving credit facility will provide sufficient cash to meet its obligations as they become due for at least 12 months from the date of the financial statements, assuming the renewal or replacement of its revolving credit facility past September 2013 and depending on the level of American Centrifuge expenditures after the conclusion of the research, development and demonstration (“RD&D”) program which is scheduled to be completed by December 31, 2013. USEC's credit facility is available to finance working capital needs and general corporate purposes. On March 14, 2013, USEC amended its credit facility, among other things, to extend the expiration date of the credit facility from May 31, 2013 to September 30, 2013. USEC repaid its existing term loan in connection with the amendment. USEC expects to renew or replace its credit facility at or prior to maturity either as part of a potential balance sheet restructuring (discussed below) or with another short term credit facility based on USEC's working capital needs. If USEC were unable to renew or replace its credit facility beyond September 2013, USEC would seek to work with customers, if needed, to effect further order movements to provide sufficient liquidity and working capital.

Although USEC expects to have adequate liquidity to meet its obligations for at least 12 months, its $530 million of convertible senior notes mature on October 1, 2014. USEC's liquidity over the next 12 months is also dependent on the level of American Centrifuge expenditures after the conclusion of the RD&D program which is scheduled to be completed by December 31, 2013. In light of the significant transition of USEC's business and the uncertainties and challenges facing USEC and in order to address the convertible notes maturity and improve USEC's credit profile and its ability to successfully finance and deploy the American Centrifuge project and to maximize USEC's participation in such project, USEC is engaged with its advisors and certain stakeholders on alternatives for a possible restructuring of its balance sheet. Although USEC has no assurance regarding its ability to pursue or complete a restructuring, a restructuring could result in significant changes to the Company's capital structure and adjustments to its balance sheet, including the creation of a new entity for accounting purposes, which would have a material impact on USEC's financial statements, including the going concern assumption on which they have been prepared.

Given the current enrichment market conditions and the challenges these conditions present for obtaining the capital necessary for commercialization of the American Centrifuge Plant (“ACP”), USEC is evaluating and pursuing the feasibility of alternatives and the actions necessary to proceed with the commercial deployment of the American Centrifuge technology including the availability of additional government support. USEC has no assurance that it will be successful in achieving any of these measures, including obtaining additional government support that may be necessary to successful commercial deployment, or the timing thereof. Therefore, USEC continues to evaluate its options concerning the American Centrifuge project including its ability to continue the project prior to or upon completion of the RD&D program, further demobilization of or delays in the commercial deployment of the project, and termination of the project. Any such actions may have a material adverse impact on USEC's ability to deploy the American Centrifuge technology, on its liquidity and on the long-term viability of its enrichment business. See Note 15, “American Centrifuge Plant” for additional information.

In addition, on May 8, 2012, USEC received a notice from the New York Stock Exchange (“NYSE”) that the average closing price of its common stock was below the NYSE's continued listing criteria relating to minimum share price. On July 1, 2013, USEC effectuated a reverse stock split of 1-for-25 shares in order to regain compliance with the NYSE continued listing criteria related to minimum share price. This action resulted in USEC's closing share price exceeding $1.00 per share, and the condition will be deemed cured if the average closing price remains above the level for at least the following 30 trading days. However, on April 30, 2013, USEC received notice from the NYSE that the decline in USEC's total market capitalization has caused it to be out of compliance with another of the NYSE's continued listing standards. In accordance with the NYSE's rules, USEC submitted a plan advising the NYSE of definitive action it has taken, or is taking, that would bring it into conformity with the market capitalization listing standards within 18 months of receipt of the letter. On August 1, 2013, the NYSE accepted USEC's plan of compliance and USEC's common stock will continue to be listed on the NYSE during the 18-month cure period, subject to the compliance with other NYSE continued listing standards and continued periodic review by the NYSE of USEC's progress with respect to its plan. USEC's plan outlines initiatives USEC must execute by quarter. These initiatives include the successful completion of American Centrifuge plant development milestones, as well as the successful execution of the Company's Russian supply agreement and the Company's potential balance sheet restructuring. The NYSE has notified us that if USEC does not achieve these financial and operational goals, the Company will be subject to NYSE trading suspension at the point the initiative or goal is not met.

Under the terms of USEC's convertible notes, a "fundamental change" is triggered if USEC's shares of common stock are not listed for trading on any of the NYSE, the American Stock Exchange (now NYSE-MKT), the NASDAQ Global Market or the NASDAQ Global Select Market, and the holders of the notes can require USEC to repurchase the notes at par for cash. USEC has no assurance that it would be eligible for listing on an alternate exchange in light of its market capitalization, stockholders' deficit and net losses. In the event a fundamental change under the convertible notes is triggered, USEC does not have adequate cash to repurchase the notes. A failure by USEC to offer to repurchase the notes or to repurchase the notes after the occurrence of a fundamental change is an event of default under the indenture governing the notes. The occurrence of a fundamental change under the convertible notes that permits the holders of the convertible notes to require a repurchase for cash is also an event of default under USEC's credit facility. See Note 15, “NYSE Listing Standards Notices” for additional information.

USEC is in discussions with the Pension Benefit Guaranty Corporation (“PBGC”) regarding the impact of its de-lease of the Portsmouth gaseous diffusion plant ("GDP") and related transition of employees on its defined benefit plan funding obligations as well as the impact of ceasing enrichment at the Paducah GDP and related transition of employees as part of future reductions in force. See Note 15, “Potential ERISA Section 4062(e) Liability” for additional information.

The above noted actions, as well as actions that may be taken by vendors, customers, creditors and other third parties in response to its actions or based on their view of its financial strength and future business prospects, could give rise to events that individually, or in the aggregate, impose significant demands on USEC's liquidity.

New Accounting Standard

In February 2013, the Financial Accounting Standards Board (“FASB”) issued guidance on the presentation of accumulated other comprehensive income (“AOCI”), adding new disclosure requirements for items reclassified out of AOCI. The new guidance does not amend any existing requirements for reporting net income or other comprehensive income in the financial statements. The implementation of the new guidance in 2013 is reflected in the notes to USEC’s consolidated condensed financial statements and did not have an effect on USEC’s results of operations, cash flows or financial position.