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Segment Information (Segment Reporting Information) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Revenues [Abstract]
Revenue, Goods	$ 32.9	$ 37.9	$ 54.2	$ 38.7
Revenue, Contract Services	6.5	6.1	20.9	12.5
Total Revenue	39.4	44.0	75.1	51.2
Gross Profit	(10.7)	(4.7)	(16.0)	(7.6)
Low Enriched Uranium Segment [Member]
Revenues [Abstract]
Revenue, Goods	32.9	37.9	54.2	38.7
Gross Profit	(10.0)	(4.6)	(23.5)	(6.5)
Contract Services Segment [Member]
Revenues [Abstract]
Gross Profit	(0.7)	(0.1)	7.5	(1.1)
Separative Work Units [Member]
Revenues [Abstract]
Revenue, Goods	32.9	37.9	50.6	38.7
Uranium [Member]
Revenues [Abstract]
Revenue, Goods	$ 0.0	$ 0.0	$ 3.6	$ 0.0

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
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-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1(a))
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