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Segment Information (Segment Reporting Information) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Segment Reporting Information [Line Items]
Revenue	$ 74.9	$ 57.7	$ 302.5	$ 290.4
Cost of sales	79.2	48.8	220.0	240.7
Advanced technology license and decommissioning costs	1.7	4.1	8.0	13.9
Selling, general and administrative	8.9	9.6	25.9	24.6
Labor and Related Expense	0.6	0.4	5.3	1.1
Amortization of Intangible Assets	1.1	2.4	5.9	7.2
Nonoperating components of net periodic benefit expense (income)	1.0	0.8	2.9	(15.4)
Interest expense	3.4	0.1	9.9	0.8
Investment income	(12.9)	(2.6)	(28.2)	(7.8)
Other Nonoperating Income	(0.1)	0.0	0.0	0.1
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	(8.0)	(5.9)	64.6	25.2
Gross Profit	(4.3)	8.9	82.5	49.7
Low Enriched Uranium Segment [Member]
Segment Reporting Information [Line Items]
Cost of sales	59.0	29.6	158.4	189.3
Gross Profit	(7.9)	5.2	75.8	38.7
Technical Solutions Segment [Member] | Operating Segments
Segment Reporting Information [Line Items]
Revenue	81.2	57.7	314.9	290.4
Cost of sales	85.6	48.8	230.7	240.7
Gross Profit	3.5	3.7	8.4	11.0
Product [Member]
Segment Reporting Information [Line Items]
Revenue	44.8	34.8	221.8	228.0
Cost of sales	52.6	29.6	147.7	189.3
Product [Member] | Low Enriched Uranium Segment [Member]
Segment Reporting Information [Line Items]
Revenue	51.1	34.8	234.2	228.0
Gross Profit	(7.8)	5.2	74.1	38.7
Product [Member] | Low Enriched Uranium Segment [Member] | Intersegment Eliminations
Segment Reporting Information [Line Items]
Revenue	6.3	0.0	12.4	0.0
Cost of sales	6.4	0.0	10.7	0.0
Gross Profit	(0.1)	0.0	1.7	0.0
Separative Work Units [Member]
Segment Reporting Information [Line Items]
Revenue	10.7	34.8	187.7	198.1
Uranium [Member]
Segment Reporting Information [Line Items]
Revenue	34.1	0.0	34.1	29.9
Service [Member]
Segment Reporting Information [Line Items]
Revenue	30.1	22.9	80.7	62.4
Cost of sales	26.6	19.2	72.3	51.4
Gross Profit	3.5	3.7	8.4	11.0
Service [Member] | Intersegment Eliminations
Segment Reporting Information [Line Items]
Revenue	(6.3)	0.0	(12.4)	0.0
Cost of sales	(6.4)	0.0	(10.7)	0.0
Gross Profit	$ 0.1	$ 0.0	$ (1.7)	$ 0.0

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