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Segment Information (Segment Reporting Information) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Segment Reporting Information [Line Items]
Revenue	$ 66.9	$ 35.3
Gross Profit	23.0	6.3
Low Enriched Uranium Segment [Member]
Segment Reporting Information [Line Items]
Gross Profit	23.9	2.9
Technical Solutions Segment [Member]
Segment Reporting Information [Line Items]
Gross Profit	(0.9)	3.4
Product [Member]
Segment Reporting Information [Line Items]
Revenue	58.8	17.7
Separative Work Units [Member]
Segment Reporting Information [Line Items]
Revenue	58.8	12.8
Uranium [Member]
Segment Reporting Information [Line Items]
Revenue	0.0	4.9
Service [Member]
Segment Reporting Information [Line Items]
Revenue	$ 8.1	$ 17.6

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