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Pension and Postretirement Health and Life Benefits (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2015 | Dec. 31, 2015 | Jun. 30, 2015 | Dec. 31, 2014
Defined Benefit Plan, Contributions by Employer |  |  | $ 7.4 |
Defined Benefit Plan, Actuarial Gain (Loss) | $ 3.9 |  | $ 3.9 |
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate | 4.50% |  | 4.50% | 4.10%
Scenario, Forecast [Member] |  |  |  |
Expected defined benefit plan contributions for next fiscal year for non-qualified plans |  | $ 1.0 |  |
Non-qualified defined benefit pension plans [Member] |  |  |  |
Defined Benefit Plan, Lump Sum Benefits Paid |  |  | $ 7.3 |
Employees' Retirement Plan of Centrus Energy Corp. [Member] |  |  |  |
Defined Benefit Plan, Lump Sum Benefits Paid |  |  | 3.1 |
Retirement Program Plan for Employees of United States Enrichment Corporation [Member] |  |  |  |
Defined Benefit Plan, Lump Sum Benefits Paid |  |  | $ 37.9 |

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- Definition Expected defined benefit plan contributions for next fiscal year for non-qualified plans + References No definition available. + Details
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- Definition Amount of gain (loss) related to change in benefit obligation resulting from changes in actuarial assumptions, for example, but not limited to, interest, mortality, employee turnover, salary, and temporary deviation from the substantive plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Gain or Loss -URI http://asc.fasb.org/extlink&oid=49168827 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition The interest rate used to adjust for the time value of money for the plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(1) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition The increase in the fair value of plan assets from contributions made by the employer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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