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Revenue and Contracts with Customers (Narrative) (Details) - USD ($) $ in Millions |  | 1 Months Ended | 12 Months Ended | 13 Months Ended | 36 Months Ended | 60 Months Ended
--- | --- | --- | --- | --- | --- | ---
Oct. 19, 2023 | Oct. 31, 2022 | May 31, 2022 | Mar. 31, 2022 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2023 | Dec. 31, 2020 | Dec. 31, 2023
Revenue, nonmonetary transaction |  |  |  |  | $ 14.8 | $ 14.5 | $ 0.0 |  |  |
Deferred revenue, additions in period |  |  |  |  | 33.4 | 33.7 |  |  |  |
Deferred revenue, revenue recognized |  |  |  |  | 23.6 | 62.4 |  |  |  |
Separative work units borrowed in period, value |  | $ 10.4 | $ 8.5 | $ 9.4 |  |  |  |  | $ 20.7 |
Separative work units owed to others noncurrent |  |  |  |  | 11.1 |  | 3.1 | $ 11.1 |  | $ 11.1
Government cost share portion |  |  |  |  | 173.0 |  |  | 173.0 |  | 173.0
Provision for Loss on Contracts |  |  |  |  | 0.0 | 20.0 |  | 0.0 |  | 0.0
Accounts receivable, net |  |  |  |  | 49.4 | 38.1 |  | 49.4 |  | 49.4
Gain (loss) related to litigation settlement |  |  |  |  |  |  | 43.5 |  |  |
Revenue, remaining performance obligation, amount |  |  |  |  | 1,000.0 |  |  | 1,000.0 |  | 1,000.0
Deferred Revenue and Advances from Customers - Current and Noncurrent |  |  |  |  | 315.0 | 319.0 |  | 315.0 |  | 315.0
Provision for loss on contracts utilized |  |  |  |  | 0.0 | 0.5 | (7.2) |  |  | 19.6
Contract with Customer, Advances, Liability |  |  |  |  | 63.0 | 61.0 |  | 63.0 |  | 63.0
accrued loss |  |  |  |  |  | 21.3 |  |  |  |
HALEU Ops Contract |  |  |  |  |  |  |  |  |  |
Provision for loss on contracts total |  |  |  |  | 0.0 | 20.0 |  | 0.0 |  | 0.0
Cost obligated to DOE |  |  |  |  |  |  |  | 59.4 |  |
Total Amount Program Cost |  |  |  |  |  |  |  | 125.9 |  |
Contract Value |  |  |  |  | 150.0 |  |  | 150.0 |  | 150.0
Additional costs obligated to DOE | $ 5.5 |  |  |  |  |  |  |  |  |
HALEU Ops Contract | Phase 2 |  |  |  |  |  |  |  |  |  |
Contract Value |  |  |  |  | 90.0 |  |  | 90.0 |  | 90.0
HALEU Demo Contract |  |  |  |  |  |  |  |  |  |
Provision for loss on contracts total |  |  |  |  |  | 0.0 |  |  |  |
Maximum [Member] | HALEU Ops Contract | Phase 1 |  |  |  |  |  |  |  |  |  |
Government cost share portion |  |  |  |  | 30.0 |  |  | 30.0 |  | 30.0
Company cost share portion |  |  |  |  | 30.0 |  |  | 30.0 |  | 30.0
Pension Plan, Defined Benefit [Member] |  |  |  |  |  |  |  |  |  |
Gain (loss) related to litigation settlement |  |  |  |  |  |  | 33.8 |  |  |
Other Postretirement Benefits Plan [Member] |  |  |  |  |  |  |  |  |  |
Gain (loss) related to litigation settlement |  |  |  |  |  |  | $ 9.7 |  |  |
Government [Member] |  |  |  |  |  |  |  |  |  |
Proceeds from Customers |  |  |  |  |  |  |  | $ 32.6 |  | $ 171.2
Government [Member] | HALEU Ops Contract |  |  |  |  |  |  |  |  |  |
Provision for loss on contracts utilized |  |  |  |  | $ 20.0 | $ 1.3 |  |  |  |

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