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Segment Information (Segment Reporting Information) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Segment Reporting Information [Line Items]
Revenue	$ 51.3	$ 33.2	$ 216.6	$ 167.6
Gross Profit	11.3	2.3	62.3	69.5
Low Enriched Uranium Segment [Member]
Segment Reporting Information [Line Items]
Gross Profit	10.1	1.3	60.8	63.6
Technical Solutions Segment [Member]
Segment Reporting Information [Line Items]
Gross Profit	1.2	1.0	1.5	5.9
Product [Member]
Segment Reporting Information [Line Items]
Revenue	40.5	20.2	186.9	123.4
Separative Work Units [Member]
Segment Reporting Information [Line Items]
Revenue	40.5	7.7	147.4	106.0
Uranium [Member]
Segment Reporting Information [Line Items]
Revenue	0.0	12.5	39.5	17.4
Service [Member]
Segment Reporting Information [Line Items]
Revenue	$ 10.8	$ 13.0	$ 29.7	$ 44.2

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