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Revenue and Contracts with Customers (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Dec. 31, 2019
Revenue, nonmonetary transaction | $ 23.4 |  |
Nonmonetary transaction, amount of barter transaction | 29.4 |  |
Separative work units owed to others noncurrent | 10.8 |  |
Government cost obligation | 53.2 |  |
Loss on contracts |  | $ 0.0 |
Provision for Loss on Contracts | 15.3 |  |
Accounts receivable, net | 17.5 |  | $ 21.1
Minimum [Member] |  |  |
Company cost share portion |  |  | 18.3
Maximum [Member] |  |  |
Government cost share portion | 115.0 |  |
Government [Member] |  |  |
Provision for Loss on Contracts | 9.7 |  | $ 10.0
Proceeds from Customers | $ 19.0 |  |

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