v3.26.1
Segment Information (Segment Reporting Information) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Segment Reporting [Line Items]    
Revenue $ 76.7 $ 73.1
Cost of sales 45.2 40.2
Advanced technology license and decommissioning costs 18.9 3.0
Selling, general and administrative 10.0 8.3
Intangible Asset, Finite-Lived, Amortization Expense 1.8 1.1
Nonoperating components of net periodic benefit expense (income) 1.0 0.9
Interest expense 4.0 3.4
Investment income (17.0) (7.3)
Other Nonoperating Income 0.3 0.1
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest 12.5 35.2
Gross Profit $ 31.5 32.9
NumberOfReportableSegmentsNotDisclosedFlag true  
Low Enriched Uranium Segment [Member]    
Segment Reporting [Line Items]    
Cost of sales $ 21.3 20.1
Gross Profit 30.1 31.2
Technical Solutions Segment [Member] | Operating Segments    
Segment Reporting [Line Items]    
Revenue 83.5 73.1
Cost of sales 49.8 40.2
Gross Profit 3.6 1.7
Product [Member]    
Segment Reporting [Line Items]    
Revenue 44.6 51.3
Cost of sales 16.7 20.1
Product [Member] | Low Enriched Uranium Segment [Member]    
Segment Reporting [Line Items]    
Revenue 51.4 51.3
Gross Profit 27.9 31.2
Product [Member] | Low Enriched Uranium Segment [Member] | Intersegment Eliminations    
Segment Reporting [Line Items]    
Revenue 6.8 0.0
Cost of sales 4.6 0.0
Gross Profit 2.2 0.0
Separative Work Units [Member]    
Segment Reporting [Line Items]    
Revenue 41.6 51.3
Uranium [Member]    
Segment Reporting [Line Items]    
Revenue 3.0 0.0
Service [Member]    
Segment Reporting [Line Items]    
Revenue 32.1 21.8
Cost of sales 28.5 20.1
Gross Profit 3.6 1.7
Service [Member] | Intersegment Eliminations    
Segment Reporting [Line Items]    
Revenue (6.8) 0.0
Cost of sales (4.6) 0.0
Gross Profit $ (2.2) $ 0.0