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Segment Information (Segment Reporting Information) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Segment Reporting Information [Line Items]
Revenue	$ 62.4	$ 75.7	$ 118.0	$ 120.7
Gross Profit	17.1	43.8	28.8	63.4
Low Enriched Uranium Segment [Member]
Segment Reporting Information [Line Items]
Gross Profit	18.2	44.5	30.9	61.9
Technical Solutions Segment [Member]
Segment Reporting Information [Line Items]
Gross Profit	(1.1)	(0.7)	(2.1)	1.5
Separative Work Units [Member]
Segment Reporting Information [Line Items]
Revenue	45.2	58.6	83.3	89.3
Uranium [Member]
Segment Reporting Information [Line Items]
Revenue	0.0	4.8	0.0	4.8
Product [Member]
Segment Reporting Information [Line Items]
Revenue	45.2	63.4	83.3	94.1
Service [Member]
Segment Reporting Information [Line Items]
Revenue	$ 17.2	$ 12.3	$ 34.7	$ 26.6

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