Segment Information (Segment Reporting Information) (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2021	Mar. 31, 2020
Segment Reporting Information [Line Items]
Revenue	$ 55.6	$ 45.0
Gross Profit	11.7	19.6
Low Enriched Uranium Segment [Member]
Segment Reporting Information [Line Items]
Gross Profit	12.7	17.4
Technical Solutions Segment [Member]
Segment Reporting Information [Line Items]
Gross Profit	(1.0)	2.2
Separative Work Units [Member]
Segment Reporting Information [Line Items]
Revenue	38.1	30.7
Uranium [Member]
Segment Reporting Information [Line Items]
Revenue	0.0	0.0
Product [Member]
Segment Reporting Information [Line Items]
Revenue	38.1	30.7
Service [Member]
Segment Reporting Information [Line Items]
Revenue	$ 17.5	$ 14.3

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

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