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Revenue and Contracts with Customers (Narrative) (Details) - USD ($)
$ in Millions
 12 Months Ended 36 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2021
Dec. 31, 2020
Sep. 30, 2021
Revenue, nonmonetary transaction $ 23.4        
Advances from customers, noncurrent 45.1 $ 45.2 $ 45.1 $ 45.2  
Deferred revenue, additions in period 47.2 38.7      
Deferred revenue, revenue recognized 42.6 0.0      
Separative work units borrowed in period, value       20.7  
Separative work units owed to others noncurrent 22.4   22.4   $ 25.5
Provision for Loss on Contracts 0.5 7.0 0.5 7.0  
Provision for loss on contracts, noncurrent 0.0 0.7 0.0 0.7  
Litigation settlement, amount awarded from other party 43.5        
Accounts receivable, net 29.1 29.6 29.1 29.6  
Gain (loss) related to litigation settlement 43.5 32.6      
Revenue, remaining performance obligation, amount 986.0 960.0 986.0 960.0  
Deferred Revenue and Advances from Customers - Current and Noncurrent 348.2   348.2    
Contract with Customer, Liability, Revenue Recognized 59.6 44.4      
Provision for loss on contracts total 0.5   0.5    
Provision for loss on contracts utilized 7.2 10.6 19.1    
Maximum [Member]          
Government cost share portion 126.7 $ 115.0 126.7 $ 115.0  
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     $ 120.3