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Inventories (Narrative) (Details) - USD ($)
$ in Millions
 1 Months Ended 12 Months Ended 36 Months Ended
Oct. 31, 2022
May 31, 2022
Mar. 31, 2022
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Inventory, Net [Abstract]              
Separative work units borrowed in period, value $ 10.4 $ 8.5 $ 9.4       $ 20.7
Separative work units repaid in period, value       $ (11.1)      
Separative work units valuation change in period       7.4 $ 7.9 $ 4.8  
Separative work units owed to others noncurrent       11.1   $ 3.1  
UF6 units borrowed in period       $ 22.5