Inventories (Narrative) (Details) - USD ($) $ in Millions |
3 Months Ended | 9 Months Ended | |||
|---|---|---|---|---|---|
Sep. 30, 2026 |
Sep. 30, 2025 |
Sep. 30, 2026 |
Sep. 30, 2025 |
Dec. 31, 2025 |
|
| Inventory, Net [Abstract] | |||||
| Separative work units valuation change in period | $ 0.0 | $ 0.5 | $ (0.6) | $ 4.1 | |
| Separative work units repaid in period, value | 0.0 | 0.0 | 38.3 | (38.8) | |
| Conversion credits, inventory | $ 4.3 | $ 10.4 | $ 4.3 | $ 10.4 | $ 0.0 |