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Segment Information (Segment Reporting Information) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Segment Reporting Information [Line Items]
Revenue	$ 99.1	$ 62.4	$ 134.4	$ 118.0
Gross Profit	60.9	17.1	67.2	28.8
Low Enriched Uranium Segment [Member]
Segment Reporting Information [Line Items]
Gross Profit	59.4	18.2	62.3	30.9
Technical Solutions Segment [Member]
Segment Reporting Information [Line Items]
Gross Profit	1.5	(1.1)	4.9	(2.1)
Product [Member]
Segment Reporting Information [Line Items]
Revenue	85.5	45.2	103.2	83.3
Separative Work Units [Member]
Segment Reporting Information [Line Items]
Revenue	85.5	45.2	98.3	83.3
Uranium [Member]
Segment Reporting Information [Line Items]
Revenue	0.0	0.0	4.9	0.0
Service [Member]
Segment Reporting Information [Line Items]
Revenue	$ 13.6	$ 17.2	$ 31.2	$ 34.7

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