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Segment Information (Segment Reporting Information) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Segment Reporting Information [Line Items]
Revenue	$ 189.0	$ 98.4	$ 232.7	$ 165.3
Gross Profit	36.5	28.0	40.8	51.0
Low Enriched Uranium Segment [Member]
Segment Reporting Information [Line Items]
Gross Profit	33.0	26.8	33.5	50.7
Technical Solutions Segment [Member]
Segment Reporting Information [Line Items]
Gross Profit	3.5	1.2	7.3	0.3
Product [Member]
Segment Reporting Information [Line Items]
Revenue	169.6	87.6	193.2	146.4
Separative Work Units [Member]
Segment Reporting Information [Line Items]
Revenue	139.7	48.1	163.3	106.9
Uranium [Member]
Segment Reporting Information [Line Items]
Revenue	29.9	39.5	29.9	39.5
Service [Member]
Segment Reporting Information [Line Items]
Revenue	$ 19.4	$ 10.8	$ 39.5	$ 18.9

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