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Segment Information (Segment Reporting Information) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Segment Reporting Information [Line Items]
Revenue	$ 45.0	$ 38.7
Gross Profit	19.6	(5.5)
Low Enriched Uranium Segment [Member]
Segment Reporting Information [Line Items]
Gross Profit	17.4	(3.2)
Contract Services Segment [Member]
Segment Reporting Information [Line Items]
Gross Profit	2.2	(2.3)
Separative Work Units [Member]
Segment Reporting Information [Line Items]
Revenue	30.7	12.4
Uranium [Member]
Segment Reporting Information [Line Items]
Revenue	0.0	22.7
Product [Member]
Segment Reporting Information [Line Items]
Revenue	30.7	35.1
Service [Member]
Segment Reporting Information [Line Items]
Revenue	$ 14.3	$ 3.6

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- Definition

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

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
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