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Revenue and Contracts with Customers (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Revenue, nonmonetary transaction |  | $ 23.4 |
Advances from customers, noncurrent |  | 45.2 | $ 29.4
Deferred revenue, additions in period |  | 38.7 | 49.2
Deferred revenue, revenue recognized |  | 0.0 | 10.7
Separative work units borrowed in period, value |  | 11.2 |
Separative work units owed to others noncurrent |  | 20.7 |
Government cost share portion |  | 115.0 |
Company cost share portion |  |  | 18.3
Government cost obligation |  | 87.4 |
Provision for Loss on Contracts |  | 7.0 | 10.0
Provision for loss on contracts, noncurrent |  | 0.7 | 8.3
Accounts receivable, net |  | 29.6 | 21.1
Gain (loss) related to litigation settlement |  | 32.6 |
Revenue, remaining performance obligation, amount |  | 960.0 | 1,000.0
Deferred Revenue and Advances from Customers - Current and Noncurrent |  | 328.0 |
Contract with Customer, Liability, Revenue Recognized |  | 44.4 |
Provision for loss on contract noncurrent |  | 0.7 |
Provision for loss on contracts total |  | 7.7 |
Provision for loss on contracts utilized |  | 10.6 |
Contract revenue portion after next twelve months |  | 4.9 |
Government [Member] |  |  |
Proceeds from Customers |  | 55.8 |
Low Enriched Uranium Segment [Member] |  |  |
Revenue, remaining performance obligation, amount |  | $ 960.0 | $ 1,000.0
Scenario, Forecast [Member] |  |  |
Litigation settlement, amount awarded from other party | $ 43.5 |  |

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