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Income Taxes Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2013
Income Tax Disclosure [Abstract] |
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] | The provision (benefit) for income taxes from continuing operations is as follows (in millions):
| Years Ended December 31,
| 2013 |  | 2012 |  | 2011
Current: |  |  |  |  |
Federal | $ | — |  |  | $ | (2.9 | ) |  | $ | (21.2 | )
State and local | (1.8 | ) |  | 2.0 |  |  | 0.6 |
Foreign | — |  |  | — |  |  | — |
| (1.8 | ) |  | (0.9 | ) |  | (20.6 | )
Deferred: |  |  |  |  |
Federal | (83.0 | ) |  | (0.2 | ) |  | 237.2 |
State and local | (1.7 | ) |  | 0.1 |  |  | 15.2 |
Foreign | — |  |  | — |  |  | — |
| (84.7 | ) |  | (0.1 | ) |  | 252.4 |
| $ | (86.5 | ) |  | $ | (1.0 | ) |  | $ | 231.8 |
Schedule of Deferred Tax Assets and Liabilities [Table Text Block] | Future tax consequences of temporary differences between the carrying amounts for financial reporting purposes and USEC’s estimate of the tax bases of its assets and liabilities result in deferred tax assets and liabilities, as follows (in millions):
| December 31,
| 2013 |  | 2012
Deferred tax assets: |  |  |
Plant lease turnover and other exit costs | $ | 17.4 |  |  | $ | 15.8 |
Employee benefits costs | 119.7 |  |  | 215.0 |
Inventory | 10.1 |  |  | 15.9 |
Property, plant and equipment | 508.8 |  |  | 490.5 |
Tax intangibles | — |  |  | 0.3 |
Depleted uranium and stored wastes | 2.9 |  |  | 3.4 |
Net operating loss and credit carryforwards | 89.2 |  |  | 35.5 |
Accrued expenses | 4.7 |  |  | 7.1 |
Prepaid expenses | — |  |  | 2.4 |
Other | 12.3 |  |  | 8.0 |
| 765.1 |  |  | 793.9 |
Valuation allowance | (763.5 | ) |  | (793.9 | )
Deferred tax assets, net of valuation allowance | 1.6 |  |  | — |
Deferred tax liabilities: |  |  |
Prepaid expenses | 1.6 |  |  | — |
Deferred tax liabilities | 1.6 |  |  | — |
| — |  |  | — |
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] | A reconciliation of income taxes calculated based on the federal statutory income tax rate of 35% and the effective tax rate follows:
| Years Ended December 31,
| 2013 |  | 2012 |  | 2011
Federal statutory tax rate | 35 | % |  | 35 | % |  | 35 | %
State income taxes, net of federal | 2 |  |  | — |  |  | — |
Research and other tax credits | — |  |  | — |  |  | 1 |
Other nondeductible expenses | (1 | ) |  | — |  |  | (1 | )
Preferred stock issuance costs and dividends paid-in-kind | (2 | ) |  | — |  |  | (1 | )
Valuation allowance against deferred tax assets | 3 |  |  | (35 | ) |  | (123 | )
Restructuring costs | (1 | ) |  | — |  |  | — |
Impact of state rate changes on deferred taxes | (4 | ) |  | — |  |  | — |
| 32 | % |  | — | % |  | (89 | )%
Summary of Income Tax Contingencies [Table Text Block] | A reconciliation of the beginning and ending amount of unrecognized tax benefits follows (in millions):
| Years Ended December 31,
| 2013 |  | 2012
Balance at beginning of the year | $ | 3.0 |  |  | $ | 3.7 |
Reductions to tax positions of prior years | (0.7 | ) |  | (0.8 | )
Additions for tax positions of current year | — |  |  | 0.1 |
Balance at end of the year | $ | 2.3 |  |  | $ | 3.0 |

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- Definition Tabular disclosure of the components of income tax expense attributable to continuing operations for each year presented including, but not limited to: current tax expense (benefit), deferred tax expense (benefit), investment tax credits, government grants, the benefits of operating loss carryforwards, tax expense that results from allocating certain tax benefits either directly to contributed capital or to reduce goodwill or other noncurrent intangible assets of an acquired entity, adjustments of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity, and adjustments of the beginning-of-the-year balances of a valuation allowance because of a change in circumstances that causes a change in judgment about the realizability of the related deferred tax asset in future years. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319 + Details
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- Definition Tabular disclosure of the components of net deferred tax asset or liability recognized in an entity's statement of financial position, including the following: the total of all deferred tax liabilities, the total of all deferred tax assets, the total valuation allowance recognized for deferred tax assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 + Details
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- Definition Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 + Details
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- Definition Tabular disclosure of tax positions taken in the tax returns filed or to be filed for which it is more likely than not that the tax position will not be sustained upon examination by taxing authorities (i.e., uncertain tax positions) and other types of income tax contingencies, including: (1) the policy on classification of interest and penalties; (2) a tabular reconciliation of the total amounts of unrecognized tax benefits at the beginning and end of the period; the total amount(s) of: (3) unrecognized tax benefits that, if recognized, would affect the effective tax rate, and (4) interest and penalties recognized in each of the income statement and balance sheet; (5) for positions for which it is reasonably possible that the total amounts unrecognized will significantly change within 12 months of the reporting date the: (i) nature of the uncertainty, (ii) nature of the event that could occur that would cause the change, and (iii) an estimate of the range of the reasonably possible change or a statement that an estimate of the range cannot be made; and (6) a description of tax years that remain subject to examination by major tax jurisdictions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319 + Details
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