v3.26.1
Segment Information (Segment Reporting Information) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Segment Reporting [Line Items]        
Revenue $ 176.1 $ 154.5 $ 252.8 $ 227.6
Cost of sales 126.2 100.6 171.4 140.8
Advanced technology license and decommissioning costs 10.8 3.3 29.7 6.3
Selling, general and administrative 26.2 13.4 36.2 21.7
Intangible Asset, Finite-Lived, Amortization Expense 2.5 3.7 4.3 4.8
Nonoperating components of net periodic benefit expense (income) 1.0 1.0 2.0 1.9
Interest expense 4.2 3.1 8.2 6.5
Investment income (16.3) (8.0) (33.3) (15.3)
Other Nonoperating Income (0.1) 0.0 0.2 0.1
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest 21.6 37.4 34.1 72.6
Gross Profit 49.9 53.9 $ 81.4 86.8
NumberOfReportableSegmentsNotDisclosedFlag     true  
Low Enriched Uranium Segment [Member]        
Segment Reporting [Line Items]        
Cost of sales 101.8 79.3 $ 123.1 99.4
Low Enriched Uranium Segment [Member] | Operating Segments        
Segment Reporting [Line Items]        
Gross Profit 51.6 52.5 81.7 83.7
Technical Solutions Segment [Member] | Operating Segments        
Segment Reporting [Line Items]        
Revenue 176.1 160.6 259.6 233.7
Cost of sales 126.2 104.9 176.0 145.1
Gross Profit (1.7) 3.2 1.9 4.9
Product [Member]        
Segment Reporting [Line Items]        
Revenue 153.4 125.7 198.0 177.0
Cost of sales 101.8 75.0 118.5 95.1
Product [Member] | Low Enriched Uranium Segment [Member]        
Segment Reporting [Line Items]        
Revenue 153.4 131.8 204.8 183.1
Gross Profit 51.6 50.7 79.5 81.9
Product [Member] | Low Enriched Uranium Segment [Member] | Intersegment Eliminations        
Segment Reporting [Line Items]        
Revenue 0.0 6.1 6.8 6.1
Cost of sales 0.0 4.3 4.6 4.3
Gross Profit 0.0 1.8 2.2 1.8
Separative Work Units [Member]        
Segment Reporting [Line Items]        
Revenue 100.0 125.7 141.6 177.0
Uranium [Member]        
Segment Reporting [Line Items]        
Revenue 53.4 0.0 56.4 0.0
Service [Member]        
Segment Reporting [Line Items]        
Revenue 22.7 28.8 54.8 50.6
Cost of sales 24.4 25.6 52.9 45.7
Gross Profit (1.7) 3.2 1.9 4.9
Service [Member] | Intersegment Eliminations        
Segment Reporting [Line Items]        
Revenue 0.0 (6.1) (6.8) (6.1)
Cost of sales 0.0 (4.3) (4.6) (4.3)
Gross Profit $ 0.0 $ (1.8) $ (2.2) $ (1.8)