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Inventories (Narrative) (Details) - USD ($)
$ in Millions
 1 Months Ended 3 Months Ended 12 Months Ended
Mar. 31, 2023
Oct. 31, 2022
May 31, 2022
Mar. 31, 2022
Dec. 31, 2023
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Inventory, Net [Abstract]                
Separative work units borrowed in period, value   $ 10.4 $ 8.5 $ 9.4        
Separative work units repaid in period, value         $ 11.1 $ (13.6)    
Separative work units valuation change in period           $ 2.1 $ 7.4 $ 7.9
UF6 units borrowed in period $ 22.5