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Segment Information (Segment Reporting Information) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Revenues [Abstract]
Revenue, Contract Services	$ 6.1	$ 8.5	$ 12.5	$ 24.9
Total Revenue	44.0	63.4	51.2	153.4
Gross Profit	(4.3)	5.5	(6.8)	21.3
Low Enriched Uranium Segment [Member]
Revenues [Abstract]
Revenue, Goods	37.9	54.9	38.7	128.5
Gross Profit	(4.2)	5.6	(5.7)	13.7
Contract Services Segment [Member]
Revenues [Abstract]
Gross Profit	(0.1)	(0.1)	(1.1)	7.6
Separative Work Units [Member]
Revenues [Abstract]
Revenue, Goods	37.9	54.9	38.7	114.2
Uranium [Member]
Revenues [Abstract]
Revenue, Goods	$ 0.0	$ 0.0	$ 0.0	$ 14.3

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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