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Revenue and Contracts with Customers (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended | 36 Months Ended | 48 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2022 | Jun. 30, 2022 | Mar. 31, 2022 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2020 | Dec. 31, 2022 | Nov. 30, 2022 | Sep. 30, 2021
Revenue, nonmonetary transaction |  |  |  | $ 14.5 | $ 0.0 | $ 23.4 |  |  |  |
Deferred revenue, additions in period |  |  |  | 33.7 | 47.2 |  |  |  |  |
Deferred revenue, revenue recognized |  |  |  | 62.4 | 42.6 |  |  |  |  |
Separative work units borrowed in period, value | $ 10.4 | $ 8.5 | $ 9.4 |  |  |  | $ 20.7 |  |  |
Separative work units owed to others noncurrent |  |  |  |  |  |  |  |  |  | $ 25.5
Provision for Loss on Contracts | 20.0 |  |  | 20.0 | 0.5 |  |  | $ 20.0 |  |
Accounts receivable, net | 38.1 |  |  | 38.1 | 29.1 |  |  | 38.1 |  |
Gain (loss) related to litigation settlement |  |  |  |  | 43.5 | 32.6 |  |  |  |
Revenue, remaining performance obligation, amount | 1,000.0 |  |  | 1,000.0 |  |  |  | 1,000.0 |  |
Deferred Revenue and Advances from Customers - Current and Noncurrent | 319.0 |  |  | 319.0 |  |  |  | 319.0 |  |
Provision for loss on contracts total | 20.0 |  |  | 20.0 | 0.0 |  |  | 20.0 |  |
Provision for loss on contracts utilized |  |  |  | 0.5 | (7.2) | $ 10.6 |  | 19.6 |  |
Contract with Customer, Advances, Liability | $ 61.0 |  |  | 61.0 | 59.6 |  |  | 61.0 |  |
Cost obligated to DOE |  |  |  | 5.0 |  |  |  |  |  |
Total Amount Program Cost |  |  |  | 120.1 |  |  |  |  |  |
accrued loss |  |  |  | $ 21.3 |  |  |  |  |  |
Maximum [Member] |  |  |  |  |  |  |  |  |  |
Government cost share portion |  |  |  |  |  |  |  |  | $ 168.7 |
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 |  |  |  |  |  |  |  | $ 164.3 |  |

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