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Segment Information (Segment Reporting Information) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Segment Reporting Information [Line Items]
Revenue	$ 35.3	$ 55.6
Gross Profit	6.3	11.7
Low Enriched Uranium Segment [Member]
Segment Reporting Information [Line Items]
Gross Profit	2.9	12.7
Technical Solutions Segment [Member]
Segment Reporting Information [Line Items]
Gross Profit	3.4	(1.0)
Product [Member]
Segment Reporting Information [Line Items]
Revenue	17.7	38.1
Separative Work Units [Member]
Segment Reporting Information [Line Items]
Revenue	12.8	38.1
Uranium [Member]
Segment Reporting Information [Line Items]
Revenue	4.9	0.0
Service [Member]
Segment Reporting Information [Line Items]
Revenue	$ 17.6	$ 17.5

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