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Inventories (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
Inventories (Narrative) (Details) - USD ($) $ in Millions	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Inventory, Net [Abstract]
UF6 units borrowed in period, value			$ 22.5
Inventory Loans, Current & Noncurrent	$ 84.6		84.6		$ 58.6
Inventory Loans, Current	9.9		9.9		$ 9.9
Separative work units valuation change in period	$ 0.6	$ 0.0	$ 3.5	$ 5.5