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Revenue and Contracts with Customers - Narrative (Details) - USD ($) $ in Millions | 9 Months Ended | 31 Months Ended | 78 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2025 | Jun. 17, 2025 | Dec. 31, 2024 | Nov. 05, 2024 | Nov. 01, 2023 | Sep. 28, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Government cost share, percentage | 80.00% |  |  |  |  |  |  |  |
Deferred revenue, revenue recognized | $ 68.5 | $ 99.6 |  |  |  |  |  |  |
Revenue, remaining performance obligation, amount | 700.0 |  |  |  |  | $ 800.0 |  |  |
LEU Segment |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Revenue, remaining performance obligation, amount | 600.0 |  |  |  |  | 700.0 |  |  |
Deferred Revenue and Advances from Customers - Current and Noncurrent | 154.8 |  |  |  |  | 216.4 |  |  |
Technical Solutions Segment |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Revenue, remaining performance obligation, amount | 98.7 |  |  |  |  | $ 28.0 |  |  |
Phase 2 |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Contract Value |  |  |  |  |  |  |  | $ 90.0 |
Option 1a |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Contract Value | 108.2 |  |  |  |  |  |  |  |
Contract Minimum Fee |  |  |  |  | $ 99.3 |  |  |  |
Contract Estimated Fee |  |  |  |  | 8.7 |  |  |  |
Option 1b |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Contract Minimum Fee |  |  |  |  | 163.5 |  |  |  |
Contract Estimated Fee |  |  |  |  | $ 15.2 |  |  |  |
HALEU Ops Contract |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Cost obligated to DOE |  |  | $ 316.2 |  |  |  |  |  |
Contract Value | 150.0 |  |  |  |  |  |  |  |
HALEU Ops Contract | Phase 2 |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Contract Value |  |  |  |  |  |  | $ 170.1 |  |
HALEU Ops Contract | Phase Scope |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Contract Value | 8.8 |  |  |  |  |  |  |  | $ 5.8
Government [Member] |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from Customers |  |  |  | $ 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] |  |  |  |  |  |  |  |  |
Proceeds from Customers |  |  | $ 195.4 |  |  |  |  |  |
Maximum [Member] | HALEU Ops Contract | Phase 1 |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Government cost share portion | 30.0 |  |  |  |  |  |  |  |
Company cost share portion | $ 30.0 |  |  |  |  |  |  |  |

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