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Revenue and Contracts with Customers - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended | 22 Months Ended | 69 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2022 | Sep. 30, 2024 | Sep. 30, 2024 | Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Provision for Loss on Contracts Utilized |  |  | $ 0.0 | $ (16.7) |  |  |  |
Deferred revenue, revenue recognized |  |  | 99.6 | 23.6 |  |  |  |
Revenue, remaining performance obligation, amount | $ 800.0 |  | 800.0 |  |  | $ 800.0 | $ 800.0 | $ 1,000.0
Unrealized Gain (Loss), Foreign Currency Transaction, before Tax | (0.1) | $ 0.6 |  | 0.6 |  |  |  |
Accrued loss |  |  |  |  | $ 21.3 |  |  |
Contract Minimum Fee | 6.9 |  | 6.9 |  |  | 6.9 | 6.9 |
LEU Segment |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Revenue, remaining performance obligation, amount | 800.0 |  | 800.0 |  |  | 800.0 | 800.0 | 1,000.0
Deferred Revenue and Advances from Customers - Current and Noncurrent | 223.0 |  | 223.0 |  |  | 223.0 | 223.0 | 315.0
Technical Solutions Segment |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Revenue, remaining performance obligation, amount | $ 18.0 |  | $ 18.0 |  |  | $ 18.0 | $ 18.0 | $ 77.0
HALEU Demo Contract |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Government cost share, percentage | 80.00% |  | 80.00% |  |  | 80.00% | 80.00% |
HALEU Ops Contract |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Cost obligated to DOE |  |  |  |  |  | $ 118.4 |  |
Total Amount Program Cost |  |  |  |  |  | 126.3 |  |
Contract Value | $ 150.0 |  | $ 150.0 |  |  | 150.0 | $ 150.0 |
New Amount Program Cost |  |  |  |  |  | 6.2 |  |
HALEU Ops Contract | Phase 2 |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Contract Value | 90.0 |  | 90.0 |  |  | 90.0 | 90.0 |
Contract Estimated Value | 7.5 |  | 7.5 |  |  | 7.5 | 7.5 |
Government [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Proceeds from Customers |  |  |  |  |  | 95.2 | 173.0 |
Government [Member] | HALEU Demo Contract |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Proceeds from Customers |  |  |  |  |  |  | 171.2 |
Government [Member] | HALEU Ops Contract |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Provision for Loss on Contracts Utilized |  | $ 5.4 |  | $ 16.7 |  |  |  |
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 | 30.0 |
Company cost share portion | $ 30.0 |  | $ 30.0 |  |  | $ 30.0 | $ 30.0 |

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