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Revenue and Contracts with Customers (Narrative) (Details) - USD ($)
$ in Millions
 1 Months Ended 12 Months Ended 13 Months Ended 36 Months Ended 60 Months Ended
Oct. 19, 2023
Oct. 31, 2022
May 31, 2022
Mar. 31, 2022
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2023
Dec. 31, 2020
Dec. 31, 2023
Revenue, nonmonetary transaction         $ 14.8 $ 14.5 $ 0.0      
Deferred revenue, additions in period         33.4 33.7        
Deferred revenue, revenue recognized         23.6 62.4        
Separative work units borrowed in period, value   $ 10.4 $ 8.5 $ 9.4         $ 20.7  
Separative work units owed to others noncurrent         11.1   3.1 $ 11.1   $ 11.1
Government cost share portion         173.0     173.0   173.0
Provision for Loss on Contracts         0.0 20.0   0.0   0.0
Accounts receivable, net         49.4 38.1   49.4   49.4
Gain (loss) related to litigation settlement             43.5      
Revenue, remaining performance obligation, amount         1,000.0     1,000.0   1,000.0
Deferred Revenue and Advances from Customers - Current and Noncurrent         315.0 319.0   315.0   315.0
Provision for loss on contracts utilized         0.0 0.5 (7.2)     19.6
Contract with Customer, Advances, Liability         63.0 61.0   63.0   63.0
accrued loss           21.3        
HALEU Ops Contract                    
Provision for loss on contracts total         0.0 20.0   0.0   0.0
Cost obligated to DOE               59.4    
Total Amount Program Cost               125.9    
Contract Value         150.0     150.0   150.0
Additional costs obligated to DOE $ 5.5                  
HALEU Ops Contract | Phase 2                    
Contract Value         90.0     90.0   90.0
HALEU Demo Contract                    
Provision for loss on contracts total           0.0        
Maximum [Member] | HALEU Ops Contract | Phase 1                    
Government cost share portion         30.0     30.0   30.0
Company cost share portion         30.0     30.0   30.0
Pension Plan, Defined Benefit [Member]                    
Gain (loss) related to litigation settlement             33.8      
Other Postretirement Benefits Plan [Member]                    
Gain (loss) related to litigation settlement             $ 9.7      
Government [Member]                    
Proceeds from Customers               $ 32.6   $ 171.2
Government [Member] | HALEU Ops Contract                    
Provision for loss on contracts utilized         $ 20.0 $ 1.3