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Segment Information (Segment Reporting Information) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Segment Reporting Information [Line Items]        
Revenue $ 154.5 $ 189.0 $ 227.6 $ 232.7
Cost of sales 100.6 152.5 140.8 191.9
Advanced technology license and decommissioning costs 3.3 4.1 6.3 9.8
Selling, general and administrative 9.2 7.1 17.0 15.0
Labor and Related Expense 4.2 0.5 4.7 0.7
Amortization of Intangible Assets 3.7 3.7 4.8 4.8
Nonoperating components of net periodic benefit expense (income) 1.0 (16.3) 1.9 (16.2)
Interest expense 3.1 0.3 6.5 0.7
Investment income (8.0) (2.4) (15.3) (5.2)
Other Nonoperating Income 0.0 0.0 0.1 0.1
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest 37.4 39.5 72.6 31.1
Gross Profit 53.9 36.5 86.8 40.8
Low Enriched Uranium Segment [Member]        
Segment Reporting Information [Line Items]        
Cost of sales 79.3 136.6 99.4 159.7
Gross Profit 52.5 33.0 83.7 33.5
Technical Solutions Segment [Member] | Operating Segments        
Segment Reporting Information [Line Items]        
Revenue 160.6 189.0 233.7 232.7
Cost of sales 104.9 152.5 145.1 191.9
Gross Profit 3.2 3.5 4.9 7.3
Product [Member]        
Segment Reporting Information [Line Items]        
Revenue 125.7 169.6 177.0 193.2
Cost of sales 75.0 136.6 95.1 159.7
Product [Member] | Low Enriched Uranium Segment [Member]        
Segment Reporting Information [Line Items]        
Revenue 131.8 169.6 183.1 193.2
Gross Profit 50.7 33.0 81.9 33.5
Product [Member] | Low Enriched Uranium Segment [Member] | Intersegment Eliminations        
Segment Reporting Information [Line Items]        
Revenue 6.1 0.0 6.1 0.0
Cost of sales 4.3 0.0 4.3 0.0
Gross Profit 1.8 0.0 1.8 0.0
Separative Work Units [Member]        
Segment Reporting Information [Line Items]        
Revenue 125.7 139.7 177.0 163.3
Uranium [Member]        
Segment Reporting Information [Line Items]        
Revenue 0.0 29.9 0.0 29.9
Service [Member]        
Segment Reporting Information [Line Items]        
Revenue 28.8 19.4 50.6 39.5
Cost of sales 25.6 15.9 45.7 32.2
Gross Profit 3.2 3.5 4.9 7.3
Service [Member] | Intersegment Eliminations        
Segment Reporting Information [Line Items]        
Revenue (6.1) 0.0 (6.1) 0.0
Cost of sales (4.3) 0.0 (4.3) 0.0
Gross Profit $ (1.8) $ 0.0 $ (1.8) $ 0.0