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Revenue and Contracts with Customers (Narrative) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Revenue, nonmonetary transaction   $ 23.4  
Advances from customers, noncurrent   45.2 $ 29.4
Deferred revenue, additions in period   38.7 49.2
Deferred revenue, revenue recognized   0.0 10.7
Separative work units borrowed in period, value   11.2  
Separative work units owed to others noncurrent   20.7  
Government cost share portion   115.0  
Company cost share portion     18.3
Government cost obligation   87.4  
Provision for Loss on Contracts   7.0 10.0
Provision for loss on contracts, noncurrent   0.7 8.3
Accounts receivable, net   29.6 21.1
Gain (loss) related to litigation settlement   32.6  
Revenue, remaining performance obligation, amount   960.0 1,000.0
Deferred Revenue and Advances from Customers - Current and Noncurrent   328.0  
Contract with Customer, Liability, Revenue Recognized   44.4  
Provision for loss on contract noncurrent   0.7  
Provision for loss on contracts total   7.7  
Provision for loss on contracts utilized   10.6  
Contract revenue portion after next twelve months   4.9  
Government [Member]      
Proceeds from Customers   55.8  
Low Enriched Uranium Segment [Member]      
Revenue, remaining performance obligation, amount   $ 960.0 $ 1,000.0
Scenario, Forecast [Member]      
Litigation settlement, amount awarded from other party $ 43.5