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Segment Information (Segment Reporting Information) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Segment Reporting Information [Line Items]
Revenue	$ 98.4	$ 99.1	$ 165.3	$ 134.4
Gross Profit	28.0	60.9	51.0	67.2
Low Enriched Uranium Segment [Member]
Segment Reporting Information [Line Items]
Gross Profit	26.8	59.4	50.7	62.3
Technical Solutions Segment [Member]
Segment Reporting Information [Line Items]
Gross Profit	1.2	1.5	0.3	4.9
Product [Member]
Segment Reporting Information [Line Items]
Revenue	87.6	85.5	146.4	103.2
Separative Work Units [Member]
Segment Reporting Information [Line Items]
Revenue	48.1	85.5	106.9	98.3
Uranium [Member]
Segment Reporting Information [Line Items]
Revenue	39.5	0.0	39.5	4.9
Service [Member]
Segment Reporting Information [Line Items]
Revenue	$ 10.8	$ 13.6	$ 18.9	$ 31.2

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