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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
	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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Defined Benefit Plan, Lump Sum Benefits Paid

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- Definition

Expected defined benefit plan contributions for current fiscal year for non-qualified plans

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- Definition

Expected defined benefit plan contributions for current fiscal year under ERISA

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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

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The interest rate used to adjust for the time value of money.

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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

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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

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Amount of employer's best estimate of contributions expected to be paid to the plan in the current remaining fiscal period.

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Amount of fresh-start adjustment to accumulated other comprehensive Income or Loss.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 852

-SubTopic 10

-Section 55

-Paragraph 10

-URI http://asc.fasb.org/extlink&oid=34712771&loc=d3e56426-112766

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