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Segment Information (Segment Reporting Information) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Revenue:
Separative work units	$ 290.2	$ 537.9
Uranium	27.6
Revenue from low enriched uranium segment	317.8	537.9
Contract services revenue	2.6	4.1
Total revenue	320.4	542.0
LEU segment gross profit	14.0	36.7
Contract services segment gross profit	(0.7)
Gross profit	$ 13.3	$ 36.7

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=6880815&loc=d3e20235-122688

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- Definition

Aggregate revenue recognized during the period (derived from goods sold, services rendered, insurance premiums, or other activities that constitute an entity's earning process). For financial services companies, also includes investment and interest income, and sales and trading gains.

+ 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=6880815&loc=d3e20235-122688



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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Article 5

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- Definition

Contracts Gross Profit

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- Definition

Gross Profit From Low Enriched Uranium Segment

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- Definition

Gross profits all segments

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- Definition

Revenue from low enriched uranium segment

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- Definition

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

+ References

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- Definition

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

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