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Revenue and Contracts with Customers (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 39 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2022 | Mar. 31, 2021 | Mar. 31, 2022 | Apr. 07, 2022 | Dec. 31, 2021
Advances from customers, noncurrent | $ 45.1 |  | $ 45.1 |  | $ 45.1
Deferred revenue, revenue recognized | 0.3 | $ 28.5 |  |  |
Separative work units owed to others noncurrent | $ 31.8 |  | $ 31.8 |  | 22.4
Government cost share, percentage | 80.00% |  | 80.00% |  |
Government cost share portion | $ 115.0 |  | $ 115.0 |  |
Company cost share portion, percentage | 20.00% |  | 20.00% |  |
Provision for Loss on Contracts Utilized | $ (0.5) | (2.0) |  |  |
Accounts receivable, net | 12.5 |  | $ 12.5 |  | 29.1
Revenue, remaining performance obligation, amount | 1,000.0 |  | 1,000.0 |  |
Deferred Revenue and Advances from Customers - Current and Noncurrent | 300.0 |  | 300.0 |  |
Maximum [Member] |  |  |  |  |
Government cost share portion | 130.0 |  | 130.0 |  |
Government [Member] |  |  |  |  |
Provision for Loss on Contracts | 0.0 |  | 0.0 |  | $ 0.5
Provision for Loss on Contracts Utilized | $ 0.5 | $ (2.0) | 19.6 |  |
Proceeds from Customers |  |  | $ 132.3 |  |
Forecast [Member] |  |  |  |  |
Government cost share portion, increase |  |  |  | $ 12.0 |
Forecast [Member] | Maximum [Member] |  |  |  |  |
Government cost share portion |  |  |  | $ 142.0 |

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