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Revenue and Contracts with Customers (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019
Deferred revenue, revenue recognized |  | $ 28.5 | $ 0.0 |  |
Separative work units owed to others | $ 25.5 | 25.5 |  | $ 20.7 |
Separative work units owed to others current | 3.0 | 3.0 |  |  |
Separative work units owed to others noncurrent | 22.5 | 22.5 |  |  |
Separative work units owed to others valuation adjustment | 4.8 |  |  |  |
Government cost share portion | 117.9 | 117.9 |  |  |
Accounts receivable, net | 16.9 | 16.9 |  | 29.6 |
Proceeds from settlement with customer |  | 43.5 |  |  |
Revenue, remaining performance obligation, amount | 1,000.0 | 1,000.0 |  | 960.0 |
Gain Related to Litigation Settlement |  | 43.5 |  |  |
Minimum [Member] |  |  |  |  |
Company cost share portion |  |  |  |  | $ 18.3
Maximum [Member] |  |  |  |  |
Government cost share portion | 115.0 | 115.0 |  |  |
Government [Member] |  |  |  |  |
Provision for Loss on Contracts | 1.2 | 1.2 |  | $ 7.0 |
Proceeds from Customers | $ 101.9 |  |  |  |
Pension Plan, Defined Benefit [Member] |  |  |  |  |
Defined Contribution Plan, Employer Supplemental Contribution Amount |  | 33.8 |  |  |
Other Postretirement Benefits Plan [Member] |  |  |  |  |
Defined Contribution Plan, Employer Supplemental Contribution Amount |  | $ 9.7 |  |  |

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