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Segment Information (Segment Reporting Information) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Segment Reporting Information [Line Items]
Revenue	$ 10.6	$ 39.4	$ 49.3	$ 75.1
Gross Profit	(4.3)	(10.7)	(9.8)	(16.0)
Low Enriched Uranium Segment [Member]
Segment Reporting Information [Line Items]
Gross Profit	(5.1)	(10.0)	(8.3)	(23.5)
Contract Services Segment [Member]
Segment Reporting Information [Line Items]
Gross Profit	0.8	(0.7)	(1.5)	7.5
Separative Work Units [Member]
Segment Reporting Information [Line Items]
Revenue	0.0	32.9	12.4	50.6
Uranium [Member]
Segment Reporting Information [Line Items]
Revenue	2.6	0.0	25.3	3.6
Product [Member]
Segment Reporting Information [Line Items]
Revenue	2.6	32.9	37.7	54.2
Service [Member]
Segment Reporting Information [Line Items]
Revenue	$ 8.0	$ 6.5	$ 11.6	$ 20.9

X

- Definition

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

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1,2)
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+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
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