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Segment Information (Segment Reporting Information) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Revenues [Abstract]
Revenue, Contract Services	$ 8.5	$ 21.1	$ 24.9	$ 42.1
Total Revenue	63.4	63.3	153.4	231.1
Gross Profit	5.5	4.3	21.3	11.2
Low Enriched Uranium Segment [Member]
Revenues [Abstract]
Revenue, Goods	54.9	42.2	128.5	189.0
Gross Profit	5.6	5.5	13.7	12.7
Contract Services Segment [Member]
Revenues [Abstract]
Gross Profit	(0.1)	(1.2)	7.6	(1.5)
Separative Work Units [Member]
Revenues [Abstract]
Revenue, Goods	54.9	42.2	114.2	145.8
Uranium [Member]
Revenues [Abstract]
Revenue, Goods	$ 0.0	$ 0.0	$ 14.3	$ 43.2

X

- Definition

Amount of revenue earned from products sold or services provided under the terms of a contract, including, but not limited to, government contracts and construction contracts, classified as other.

+ 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=63488584&loc=d3e20235-122688

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Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity.

+ 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 210.5-03.1,2)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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+ 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)
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Aggregate revenue during the period from the sale of goods in the normal course of business, after deducting returns, allowances and discounts.

+ 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(a))
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