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Segment Information (Segment Reporting Information) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Revenues [Abstract]
Separative work units	$ 295.8	$ 559.5	$ 853.4	$ 1,444.6
Uranium	3.8	0	45.3	3.6
Revenue from low enriched uranium segment	299.6	559.5	898.7	1,448.2
Contract services	4.2	3.5	10.3	10.6
Total Revenue	303.8	563.0	909.0	1,458.8
LEU segment gross profit	(30.8)	36.7	(63.7)	83.8
Contract services segment gross profit	0.8	(0.1)	0.1	(0.3)
Gross profit	$ (30.0)	$ 36.6	$ (63.6)	$ 83.5

X

- Definition

Revenue earned during the period arising from products sold or services provided under the terms of a contract, not elsewhere specified in the taxonomy. May include government contracts, construction contracts, and any other contract related to a particular project or product.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

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Contracts Gross Profit

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Gross Profit From Low Enriched Uranium Segment

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Gross profits all segments

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Revenue from low enriched uranium segment

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Revenue derived from sales of the separative work unit (SWU) component of low enriched uranium (LEU).

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Revenue derived from sales of uranium and the uranium component of low enriched uranium (LEU).

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