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Segment Information (Segment Reporting Information) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Segment Reporting Information [Line Items]
Revenue	$ 91.3	$ 33.6	$ 209.3	$ 154.3
Gross Profit	49.5	(0.8)	78.3	62.6
Low Enriched Uranium Segment [Member]
Segment Reporting Information [Line Items]
Gross Profit	8.3	(0.9)	39.2	61.0
Technical Solutions Segment [Member]
Segment Reporting Information [Line Items]
Gross Profit	41.2	0.1	39.1	1.6
Separative Work Units [Member]
Segment Reporting Information [Line Items]
Revenue	19.1	0.1	102.4	89.4
Uranium [Member]
Segment Reporting Information [Line Items]
Revenue	12.9	18.6	12.9	23.4
Product [Member]
Segment Reporting Information [Line Items]
Revenue	32.0	18.7	115.3	112.8
Service [Member]
Segment Reporting Information [Line Items]
Revenue	$ 59.3	$ 14.9	$ 94.0	$ 41.5

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