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Inventories (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended | 36 Months Ended |
--- | --- | --- | --- | --- | ---
Dec. 31, 2022 | Jun. 30, 2022 | Mar. 31, 2022 | Jun. 30, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Sep. 30, 2021
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 |  |  |  |  | $ 3.1 |  |
Separative work units valuation change in period | $ 2.4 |  |  | $ 5.5 | $ 4.8 |  |
Separative work units owed to others noncurrent |  |  |  |  |  |  | $ 25.5

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