Basis of Presentation	3 Months Ended
Mar. 31, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	BASIS OF PRESENTATION The unaudited consolidated condensed financial statements of USEC Inc. ("USEC" or the "Company") as of and for the three months ended March 31, 2014 and 2013 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. In March 2013, USEC’s wholly owned subsidiary NAC International, Inc. (“NAC”) was acquired by Hitz Holdings U.S.A. Inc., a subsidiary of Hitachi Zosen Corporation. USEC recorded a gain on the sale of $35.6 million in the first quarter of 2013. Results for NAC through the date of divestiture of March 15, 2013 are segregated from continuing operations and reported as discontinued operations. Operating results for the three months ended March 31, 2014 are not necessarily indicative of the results that may be expected for the year ending December 31, 2014. 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, 2013. Chapter 11 Filing On March 5, 2014, USEC Inc. filed a voluntary petition for relief (the "Bankruptcy Filing") under Chapter 11 of the United States Bankruptcy Code in the United States Bankruptcy Court for the District of Delaware (the "Bankruptcy Court"). The Bankruptcy Filing was a “pre-arranged” filing which included the filing of a proposed reorganization plan which is supported by certain holders of the claims and interests impaired under the reorganization plan. The Bankruptcy Filing is intended to strengthen the Company’s balance sheet, enhance its ability to sponsor the American Centrifuge project and improve its long-term business opportunities. Additional details are provided in Note 2. The Company incurred a net loss for the three months ended March 31, 2014 and for the years ended December 31, 2013, 2012 and, 2011, and had a shareholders’ deficit as of March 31, 2014. USEC’s business is in a state of significant transition and is subject to numerous risks and uncertainties. The increasingly competitive industry conditions under which USEC operates have negatively impacted the Company’s results of operations and cash flows and may continue to do so in the future. These factors raise substantial doubt about the Company’s ability to continue as a going concern. The consolidated condensed financial statements have been prepared assuming that USEC will continue as a going concern and contemplate the realization of assets and the satisfaction of liabilities in the normal course of business. USEC Inc.’s ability to continue as a going concern is contingent upon the Bankruptcy Court’s approval of the proposed reorganization plan and the Company’s ability to successfully implement the proposed reorganization plan, among other factors. As a result of the Bankruptcy Filing, the realization of assets and the satisfaction of liabilities are subject to uncertainty. While operating as a debtor-in-possession under Chapter 11, USEC Inc. may sell or otherwise dispose of or liquidate assets or settle liabilities, subject to the approval of the Bankruptcy Court or as otherwise permitted in the ordinary course of business (subject to restrictions), for amounts other than those reflected in the consolidated condensed financial statements. Further, USEC's reorganization could materially change the amounts and classifications of assets and liabilities reported in the consolidated condensed financial statements. The consolidated condensed financial statements do not include any adjustments related to the recoverability and classification of assets or the amounts and classification of liabilities or any other adjustments that might be necessary should the Company be unable to continue as a going concern or as a consequence of the Bankruptcy Filing, including confirmation of a plan of reorganization or emergence from bankruptcy. Financial Reporting in Reorganization Liabilities subject to compromise in the Chapter 11 proceedings are distinguished from liabilities of the Company's subsidiaries that were not part of the Bankruptcy Filing and from post-petition liabilities in the accompanying Consolidated Condensed Balance Sheet as of March 31, 2014. Under Section 362 of the Bankruptcy Code, the filing of a voluntary bankruptcy petition by USEC Inc. automatically stayed most actions against USEC Inc., including most actions to collect indebtedness incurred prior to March 5, 2014 or to exercise control over USEC Inc.’s property. Accordingly, although the Bankruptcy Filing triggered defaults for certain of USEC Inc.’s obligations, creditors are stayed from taking any actions as a result of such defaults. Absent an order of the Bankruptcy Court, substantially all of USEC Inc.’s pre-petition liabilities are subject to settlement under the proposed reorganization plan. Expenses, gains and losses directly associated with reorganization proceedings are reported as Reorganization Items, Net in the accompanying Consolidated Condensed Statement of Operations. Reorganization Items are indicated as cash or non-cash items in the accompanying Consolidated Condensed Statement of Cash Flows. New Accounting Standards In July 2013, the Financial Accounting Standards Board ("FASB") issued guidance requiring an entity to present unrecognized tax benefits as a reduction to deferred tax assets when a net operating loss carryforward, similar tax loss or a tax credit carryforward exists, with limited exceptions. This pronouncement is effective beginning in the first quarter of 2014. USEC has historically presented uncertain tax positions in accordance with the new guidance and the implementation of the guidance did not have a material impact on its consolidated financial statements. In April 2014, the FASB issued amendments to guidance for reporting discontinued operations and disposals of components of an entity. The amended guidance changes the definition of a discontinued operation to include only those disposals of components of an entity that represent a strategic shift that has, or will have, a major effect on an entity’s operations and financial results. The amendments also expand the disclosure requirements for discontinued operations and add new disclosures for individually significant dispositions that do not qualify as discontinued operations. The amendments are effective prospectively beginning in the first quarter of 2015 (early adoption is permitted only for disposals that have not been previously reported). The implementation of the amended guidance is not expected to have a material impact on USEC's results of operations, cash flows or financial position.

BASIS OF PRESENTATION

The unaudited consolidated condensed financial statements of USEC Inc. ("USEC" or the "Company") as of and for the three months ended March 31, 2014 and 2013 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.

In March 2013, USEC’s wholly owned subsidiary NAC International, Inc. (“NAC”) was acquired by Hitz Holdings U.S.A. Inc., a subsidiary of Hitachi Zosen Corporation. USEC recorded a gain on the sale of $35.6 million in the first quarter of 2013. Results for NAC through the date of divestiture of March 15, 2013 are segregated from continuing operations and reported as discontinued operations.

Operating results for the three months ended March 31, 2014 are not necessarily indicative of the results that may be expected for the year ending December 31, 2014. 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, 2013.

Chapter 11 Filing

On March 5, 2014, USEC Inc. filed a voluntary petition for relief (the "Bankruptcy Filing") under Chapter 11 of the United States Bankruptcy Code in the United States Bankruptcy Court for the District of Delaware (the "Bankruptcy Court"). The Bankruptcy Filing was a “pre-arranged” filing which included the filing of a proposed reorganization plan which is supported by certain holders of the claims and interests impaired under the reorganization plan. The Bankruptcy Filing is intended to strengthen the Company’s balance sheet, enhance its ability to sponsor the American Centrifuge project and improve its long-term business opportunities. Additional details are provided in Note 2.

The Company incurred a net loss for the three months ended March 31, 2014 and for the years ended December 31, 2013, 2012 and, 2011, and had a shareholders’ deficit as of March 31, 2014. USEC’s business is in a state of significant transition and is subject to numerous risks and uncertainties. The increasingly competitive industry conditions under which USEC operates have negatively impacted the Company’s results of operations and cash flows and may continue to do so in the future. These factors raise substantial doubt about the Company’s ability to continue as a going concern. The consolidated condensed financial statements have been prepared assuming that USEC will continue as a going concern and contemplate the realization of assets and the satisfaction of liabilities in the normal course of business. USEC Inc.’s ability to continue as a going concern is contingent upon the Bankruptcy Court’s approval of the proposed reorganization plan and the Company’s ability to successfully implement the proposed reorganization plan, among other factors. As a result of the Bankruptcy Filing, the realization of assets and the satisfaction of liabilities are subject to uncertainty. While operating as a debtor-in-possession under Chapter 11, USEC Inc. may sell or otherwise dispose of or liquidate assets or settle liabilities, subject to the approval of the Bankruptcy Court or as otherwise permitted in the ordinary course of business (subject to restrictions), for amounts other than those reflected in the consolidated condensed financial statements. Further, USEC's reorganization could materially change the amounts and classifications of assets and liabilities reported in the consolidated condensed financial statements. The consolidated condensed financial statements do not include any adjustments related to the recoverability and classification of assets or the amounts and classification of liabilities or any other adjustments that might be necessary should the Company be unable to continue as a going concern or as a consequence of the Bankruptcy Filing, including confirmation of a plan of reorganization or emergence from bankruptcy.

Financial Reporting in Reorganization

Liabilities subject to compromise in the Chapter 11 proceedings are distinguished from liabilities of the Company's subsidiaries that were not part of the Bankruptcy Filing and from post-petition liabilities in the accompanying Consolidated Condensed Balance Sheet as of March 31, 2014. Under Section 362 of the Bankruptcy Code, the filing of a voluntary bankruptcy petition by USEC Inc. automatically stayed most actions against USEC Inc., including most actions to collect indebtedness incurred prior to March 5, 2014 or to exercise control over USEC Inc.’s property. Accordingly, although the Bankruptcy Filing triggered defaults for certain of USEC Inc.’s obligations, creditors are stayed from taking any actions as a result of such defaults. Absent an order of the Bankruptcy Court, substantially all of USEC Inc.’s pre-petition liabilities are subject to settlement under the proposed reorganization plan.

Expenses, gains and losses directly associated with reorganization proceedings are reported as Reorganization Items, Net in the accompanying Consolidated Condensed Statement of Operations. Reorganization Items are indicated as cash or non-cash items in the accompanying Consolidated Condensed Statement of Cash Flows.

New Accounting Standards

In July 2013, the Financial Accounting Standards Board ("FASB") issued guidance requiring an entity to present unrecognized tax benefits as a reduction to deferred tax assets when a net operating loss carryforward, similar tax loss or a tax credit carryforward exists, with limited exceptions. This pronouncement is effective beginning in the first quarter of 2014. USEC has historically presented uncertain tax positions in accordance with the new guidance and the implementation of the guidance did not have a material impact on its consolidated financial statements.

In April 2014, the FASB issued amendments to guidance for reporting discontinued operations and disposals of components of an entity. The amended guidance changes the definition of a discontinued operation to include only those disposals of components of an entity that represent a strategic shift that has, or will have, a major effect on an entity’s operations and financial results. The amendments also expand the disclosure requirements for discontinued operations and add new disclosures for individually significant dispositions that do not qualify as discontinued operations. The amendments are effective prospectively beginning in the first quarter of 2015 (early adoption is permitted only for disposals that have not been previously reported). The implementation of the amended guidance is not expected to have a material impact on USEC's results of operations, cash flows or financial position.