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Inventories (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Inventories (Narrative) (Details) - USD ($) $ in Millions	Jun. 30, 2023	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Inventory, Net [Abstract]
UF6 units borrowed in period, value		$ 22.5
Inventory Loans, Current & Noncurrent	$ 84.0	84.0		$ 58.6
Inventory Loans, Current	9.9	9.9		$ 9.9
Separative work units valuation change in period	$ 0.8	$ 2.9	$ 5.5