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Segment Information (Segment Reporting Information) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019
Segment Reporting Information [Line Items]
Revenue									$ 247.2	$ 209.7
Gross Profit	$ 35.0	$ (0.8)	$ 43.8	$ 19.6	$ 6.8	$ 35.5	$ (4.3)	$ (5.5)	97.6	32.5
Low Enriched Uranium Segment [Member]
Segment Reporting Information [Line Items]
Gross Profit									97.8	50.8
Technical Solutions Segment [Member]
Segment Reporting Information [Line Items]
Gross Profit									(0.2)	(18.3)
Separative Work Units [Member]
Segment Reporting Information [Line Items]
Revenue									151.5	123.7
Uranium [Member]
Segment Reporting Information [Line Items]
Revenue									39.0	45.7
Product [Member]
Segment Reporting Information [Line Items]
Revenue									190.5	169.4
Service [Member]
Segment Reporting Information [Line Items]
Revenue									$ 56.7	$ 40.3

X

- Definition

Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity.

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