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Revenue and Contracts with Customers (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
Revenue, nonmonetary transaction |  | $ 23.4 |  |
Nonmonetary transaction, amount of barter transaction |  | 44.4 |  |
Separative work units owed to others noncurrent | $ 10.8 | 10.8 |  |
Government cost obligation | 65.1 | 65.1 |  |
Loss on contracts |  |  | $ 0.0 |
Provision for Loss on Contracts | 13.0 | 13.0 |  |
Accounts receivable, net | 31.2 | 31.2 |  | $ 21.1
Proceeds from settlement with customer | 32.4 |  |  |
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 | 9.1 | $ 9.1 |  | $ 10.0
Proceeds from Customers | $ 30.2 |  |  |

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