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Revenue and Contracts with Customers (Narrative) (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended 36 Months Ended 48 Months Ended
Dec. 31, 2022
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2020
Dec. 31, 2022
Nov. 30, 2022
Sep. 30, 2021
Revenue, nonmonetary transaction       $ 14.5 $ 0.0 $ 23.4        
Deferred revenue, additions in period       33.7 47.2          
Deferred revenue, revenue recognized       62.4 42.6          
Separative work units borrowed in period, value $ 10.4 $ 8.5 $ 9.4       $ 20.7      
Separative work units owed to others noncurrent                   $ 25.5
Provision for Loss on Contracts 20.0     20.0 0.5     $ 20.0    
Accounts receivable, net 38.1     38.1 29.1     38.1    
Gain (loss) related to litigation settlement         43.5 32.6        
Revenue, remaining performance obligation, amount 1,000.0     1,000.0       1,000.0    
Deferred Revenue and Advances from Customers - Current and Noncurrent 319.0     319.0       319.0    
Provision for loss on contracts total 20.0     20.0 0.0     20.0    
Provision for loss on contracts utilized       0.5 (7.2) $ 10.6   19.6    
Contract with Customer, Advances, Liability $ 61.0     61.0 59.6     61.0    
Cost obligated to DOE       5.0            
Total Amount Program Cost       120.1            
accrued loss       $ 21.3            
Maximum [Member]                    
Government cost share portion                 $ 168.7  
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               $ 164.3