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v3.23.1

Revenue and Contracts with Customers - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 4 Months Ended | 51 Months Ended |
--- | --- | --- | --- | ---
Mar. 31, 2023 | Mar. 31, 2022 | Mar. 31, 2023 | Mar. 31, 2023 | Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Provision for Loss on Contracts Utilized | $ (5.6) | $ (0.5) |  |  |
Deferred revenue, revenue recognized | 0.0 | 0.3 |  |  |
Revenue, remaining performance obligation, amount | 1,000.0 |  | $ 1,000.0 | $ 1,000.0 |
Deferred Revenue and Advances from Customers - Current and Noncurrent | $ 320.0 |  | $ 320.0 | $ 320.0 | $ 319.0
HALEU Demo Contract |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Government cost share, percentage | 80.00% |  | 80.00% | 80.00% |
HALEU Ops Contract |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Cost obligated to DOE |  |  | $ 33.0 |  |
Total Amount Program Cost |  |  | 120.1 |  |
Contract Value | $ 150.0 |  | 150.0 | $ 150.0 |
HALEU Ops Contract | Phase 2 |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Contract Value | 90.0 |  | 90.0 | 90.0 |
Government [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Provision for Loss on Contracts | 14.5 |  | 14.5 | 14.5 | $ 20.0
Proceeds from Customers |  |  | 4.1 | 171.1 |
Government [Member] | HALEU Demo Contract |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Provision for Loss on Contracts Utilized | 0.0 | $ (0.5) |  | 19.6 |
Provision for Loss on Contracts | 0.0 |  | 0.0 | 0.0 |
Government [Member] | HALEU Ops Contract |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Provision for Loss on Contracts Utilized | 5.5 |  | 6.8 |  |
Provision for Loss on Contracts | 14.5 |  | 14.5 | 14.5 |
Maximum [Member] | HALEU Demo Contract |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Government cost share portion | 173.0 |  | 173.0 | 173.0 |
Maximum [Member] | HALEU Ops Contract | Phase 1 |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Government cost share portion | 30.0 |  | 30.0 | 30.0 |
Company cost share portion | $ 30.0 |  | $ 30.0 | $ 30.0 |

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