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Inventories (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended	9 Months Ended
Inventories (Narrative) (Details) - USD ($) $ in Millions	Sep. 30, 2025	Sep. 30, 2024	Jun. 30, 2025	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Inventory, Net [Abstract]
Separative work units valuation change in period	$ 0.5	$ 1.9		$ 4.1	$ 3.7
Separative work units repaid in period, value			$ (38.8)
Conversion credits, inventory	$ 10.4			$ 10.4		$ 0.0
UF6 repaid in period, value			$ 29.8