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Segment Information (Segment Reporting Information) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Revenues [Abstract]
Revenue, Contract Services	$ 6.8	$ 7.3	$ 19.3	$ 32.2
Total Revenue	50.3	21.4	101.5	174.8
Gross Profit	11.6	(2.1)	4.8	19.2
Low Enriched Uranium Segment [Member]
Revenues [Abstract]
Revenue, Goods	43.5	14.1	82.2	142.6
Gross Profit	11.1	(1.8)	5.4	11.9
Contract Services Segment [Member]
Revenues [Abstract]
Gross Profit	0.5	(0.3)	(0.6)	7.3
Separative Work Units [Member]
Revenues [Abstract]
Revenue, Goods	43.5	14.1	82.2	128.3
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)
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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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+ References

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-Name Accounting Standards Codification
-Topic 225
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