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Segment Information (Segment Reporting Information) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Segment Reporting Information [Line Items]
Revenue	$ 43.7	$ 66.9
Gross Profit	4.3	23.0
Low Enriched Uranium Segment [Member]
Segment Reporting Information [Line Items]
Gross Profit	0.5	23.9
Technical Solutions Segment [Member]
Segment Reporting Information [Line Items]
Gross Profit	3.8	(0.9)
Product [Member]
Segment Reporting Information [Line Items]
Revenue	23.6	58.8
Separative Work Units [Member]
Segment Reporting Information [Line Items]
Revenue	23.6	58.8
Uranium [Member]
Segment Reporting Information [Line Items]
Revenue	0.0	0.0
Service [Member]
Segment Reporting Information [Line Items]
Revenue	$ 20.1	$ 8.1

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