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Segment Information (Segment Reporting Information) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Segment Reporting Information [Line Items]
Revenue	$ 38.7	$ 35.7
Gross Profit	(5.5)	(5.6)
Low Enriched Uranium Segment [Member]
Segment Reporting Information [Line Items]
Gross Profit		(13.5)
Contract Services Segment [Member]
Segment Reporting Information [Line Items]
Gross Profit		7.9
Separative Work Units [Member]
Segment Reporting Information [Line Items]
Revenue		17.7
Uranium [Member]
Segment Reporting Information [Line Items]
Revenue	22.7
Product [Member]
Segment Reporting Information [Line Items]
Revenue	$ 35.1	$ 21.3

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

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