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Revenue and Contracts with Customers (Tables) | 9 Months Ended
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Sep. 30, 2025
Revenue from Contract with Customer [Abstract] |
Revenue from External Customers by Geographic Areas | The following table presents revenue from SWU and uranium sales disaggregated by geographical region based on the billing addresses of customers (in millions):
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2025 |  | 2024 |  | 2025 |  | 2024
United States | $ | 34.1 |  |  | $ | — |  |  | $ | 142.5 |  |  | $ | 86.1 |
Foreign | 10.7 |  |  | 34.8 |  |  | 79.3 |  |  | 141.9
Revenue - SWU and uranium | $ | 44.8 |  |  | $ | 34.8 |  |  | $ | 221.8 |  |  | $ | 228.0 |
Contract with Customer, Asset and Liability | The following table presents the components of accounts receivable (in millions):
|  | September 30, 2025 |  | December 31, 2024
Accounts receivable: |  |  |  |
Billed |  | $ | 44.1 |  |  | $ | 69.8 |
Unbilled * |  | 16.6 |  |  | 10.2 |
Accounts receivable |  | $ | 60.7 |  |  | $ | 80.0 |
* Billings under certain contracts in the Technical Solutions segment are invoiced based on approved provisional billing rates. Unbilled revenue represents the difference between actual costs incurred and invoiced amounts. The Company expects to invoice and collect the unbilled amounts after actual rates are submitted to and approved by the customer. Unbilled revenue also includes unconditional rights to payment that are not yet billable under applicable contracts due to timing of invoice processing or pending the compilation of supporting documentation.
Contract Liabilities The following table presents changes in contract liability balances (in millions):
|  | September 30, 2025 |  | December 31, 2024 |  | Year-To-Date Change
Deferred revenue - current |  | $ | 154.8 |  |  | $ | 183.6 |  |  | $ | (28.8) |
Advances from customers - current |  | $ | — |  |  | $ | 32.8 |  |  | $ | (32.8) |

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- Definition Tabular disclosure of receivable, contract asset, and contract liability from contract with customer. Includes, but is not limited to, change in contract asset and contract liability. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 10 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-10 + Details
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- Definition Tabular disclosure of revenue from external customers by geographic areas attributed to the entity's country of domicile and to foreign countries from which the entity derives revenue. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 41 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-41 + Details
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