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Segment Information (Segment Reporting Information) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Segment Reporting Information [Line Items]
Revenue	$ 57.7	$ 51.3	$ 290.4	$ 216.6
Gross Profit	8.9	11.3	49.7	62.3
Low Enriched Uranium Segment [Member]
Segment Reporting Information [Line Items]
Gross Profit	5.2	10.1	38.7	60.8
Technical Solutions Segment [Member]
Segment Reporting Information [Line Items]
Gross Profit	3.7	1.2	11.0	1.5
Product [Member]
Segment Reporting Information [Line Items]
Revenue	34.8	40.5	228.0	186.9
Separative Work Units [Member]
Segment Reporting Information [Line Items]
Revenue	34.8	40.5	198.1	147.4
Uranium [Member]
Segment Reporting Information [Line Items]
Revenue	0.0	0.0	29.9	39.5
Service [Member]
Segment Reporting Information [Line Items]
Revenue	$ 22.9	$ 10.8	$ 62.4	$ 29.7

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