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Segment Information (Segment Reporting Information) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Segment Reporting Information [Line Items]    
Revenue $ 73.1 $ 43.7
Cost of sales 40.2 39.4
Advanced technology license and decommissioning costs 3.0 5.7
Selling, general and administrative 8.3 8.1
Amortization of Intangible Assets 1.1 1.1
Nonoperating components of net periodic benefit expense (income) 0.9 0.1
Interest expense 3.4 0.4
Investment income (7.3) (2.8)
Other Nonoperating Income 0.1 0.1
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest 35.2 (8.4)
Gross Profit 32.9 4.3
Low Enriched Uranium Segment [Member]    
Segment Reporting Information [Line Items]    
Gross Profit 31.2 0.5
Technical Solutions Segment [Member]    
Segment Reporting Information [Line Items]    
Gross Profit 1.7 3.8
Product [Member]    
Segment Reporting Information [Line Items]    
Revenue 51.3 23.6
Cost of sales 20.1 23.1
Separative Work Units [Member]    
Segment Reporting Information [Line Items]    
Revenue 51.3 23.6
Uranium [Member]    
Segment Reporting Information [Line Items]    
Revenue 0.0 0.0
Service [Member]    
Segment Reporting Information [Line Items]    
Revenue 21.8 20.1
Cost of sales $ 20.1 $ 16.3