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Segment Information Schedule Of Entity Wide Revenue By Major Customers (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Customer A [Member] | Low Enriched Uranium Segment [Member]
Revenue, Major Customer [Line Items]
Revenue	$ 12.5	$ 12.6	$ 54.1
Customer A [Member] | Technical Solutions Segment [Member]
Revenue, Major Customer [Line Items]
Revenue	10.7	11.7	29.4	$ 35.7
Customer B [Member] | Low Enriched Uranium Segment [Member]
Revenue, Major Customer [Line Items]
Revenue		$ 7.3	$ 47.8
Customer C [Member] | Low Enriched Uranium Segment [Member]
Revenue, Major Customer [Line Items]
Revenue	14.9
Customer E [Member] | Low Enriched Uranium Segment [Member]
Revenue, Major Customer [Line Items]
Revenue				44.9
Customer D [Member] | Low Enriched Uranium Segment [Member]
Revenue, Major Customer [Line Items]
Revenue	$ 8.7			$ 19.2

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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