Inventories (Narrative) (Details) - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
Jun. 30, 2026 |
Jun. 30, 2025 |
|
| Inventory, Net [Abstract] | ||||
| Separative work units valuation change in period | $ 0.0 | $ 1.5 | $ (0.6) | $ 3.6 |
| Separative work units repaid in period, value | $ 2.5 | $ (12.3) | $ 38.3 | (38.8) |
| UF6 repaid in period, value | $ 29.8 | |||