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Pension and Postretirement Health and Life Benefits (Narrative) (Details) (USD $) In Millions, unless otherwise specified |  | 9 Months Ended | 12 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended
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Sep. 30, 2014 | Sep. 30, 2014 Defined Benefit Pension Plans [Member] | Dec. 31, 2013 Defined Benefit Pension Plans [Member] | Sep. 30, 2014 Pension Plan A [Member] | Sep. 30, 2014 Pension Plan B [Member] | Sep. 30, 2014 Pension Plan C [Member] | Sep. 30, 2014 Pension Plan C [Member] | Sep. 30, 2014 Postretirement Health and Life Benefits Plans [Member] | Dec. 31, 2013 Postretirement Health and Life Benefits Plans [Member]
Expected defined benefit plan contributions for current fiscal year |  | $ 20.4 |  |  |  |  |  |  |
Expected defined benefit plan contributions for current fiscal year under ERISA |  | 20.1 |  |  |  |  |  |  |
Expected defined benefit plan contributions for current fiscal year for non-qualified plans |  | 0.3 |  |  |  |  |  |  |
USEC contributions |  | 20.3 |  |  |  |  |  |  |
Defined Benefit Plan, Lump Sum Benefits Paid |  | 24.7 |  |  |  |  |  |  |
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate |  |  | 4.87% | 4.44% | 4.33% |  | 4.41% | 4.03% | 4.45%
Defined Benefit Plan, Actuarial Gain (Loss) |  | 85.5 |  |  |  | 2.2 |  | 9.2 |
Fresh-Start Adjustment, Increase (Decrease), Accumulated Other Comprehensive Income (Loss) | $ 121.7 |  |  |  |  |  |  |  |

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- Definition Expected defined benefit plan contributions for current fiscal year for non-qualified plans + References No definition available. + Details
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- Definition Expected defined benefit plan contributions for current fiscal year under ERISA + 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 -Topic 715 -SubTopic 30 -Glossary Gain or Loss -URI http://asc.fasb.org/extlink&oid=6514294 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=35743120&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Glossary Gain or Loss -URI http://asc.fasb.org/extlink&oid=6749293 + Details
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- Definition The interest rate used to adjust for the time value of money. + 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=35743120&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=35743120&loc=d3e1928-114920 + Details
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