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Segment Information (Segment Reporting Information) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Revenues [Abstract]
Revenue, Goods	$ 28.9	$ 43.5	$ 83.1	$ 82.2
Revenue, Contract Services	5.2	6.8	26.1	19.3
Total Revenue	34.1	50.3	109.2	101.5
Gross Profit	7.8	11.3	(8.2)	3.7
Low Enriched Uranium Segment [Member]
Revenues [Abstract]
Revenue, Goods	28.9	43.5	83.1	82.2
Gross Profit	8.0	10.8	(15.5)	4.3
Contract Services Segment [Member]
Revenues [Abstract]
Gross Profit	(0.2)	0.5	7.3	(0.6)
Separative Work Units [Member]
Revenues [Abstract]
Revenue, Goods	17.6	43.5	68.2	82.2
Uranium [Member]
Revenues [Abstract]
Revenue, Goods	$ 11.3	$ 0.0	$ 14.9	$ 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
-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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