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Inventories (Narrative) (Details) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended | 36 Months Ended
--- | --- | --- | ---
Oct. 31, 2022 | May 31, 2022 | Mar. 31, 2022 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Inventory, Net [Abstract] |  |  |  |  |  |  |
Separative work units borrowed in period, value | $ 10.4 | $ 8.5 | $ 9.4 |  |  |  | $ 20.7
Separative work units repaid in period, value |  |  |  | $ (11.1) |  |  |
Separative work units valuation change in period |  |  |  | 7.4 | $ 7.9 | $ 4.8 |
Separative work units owed to others noncurrent |  |  |  | 11.1 |  | $ 3.1 |
UF6 units borrowed in period |  |  |  | $ 22.5 |  |  |

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