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Inventories (Narrative) (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended		6 Months Ended
Inventories (Narrative) (Details) - USD ($) $ in Millions	Jun. 30, 2025	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Inventory, Net [Abstract]
Separative work units valuation change in period		$ 1.5	$ 1.5	$ 3.6	$ 1.8
Separative work units repaid in period, value	$ (29.8)	$ (12.3)		$ (38.8)