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Revenue and Contracts with Customers (Tables) | 6 Months Ended
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Jun. 30, 2024
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 June 30, |  | Six Months Ended June 30,
| 2024 |  | 2023 |  | 2024 |  | 2023
United States | $ | 62.5 |  |  | $ | 72.8 |  |  | $ | 86.1 |  |  | $ | 131.5 |
Foreign | 107.1 |  |  | 14.8 |  |  | 107.1 |  |  | 14.9
Revenue - SWU and uranium | $ | 169.6 |  |  | $ | 87.6 |  |  | $ | 193.2 |  |  | $ | 146.4 |
Contract with Customer, Asset and Liability |
|  | June 30, 2024 |  | December 31, 2023
|  | (in millions)
Accounts receivable: |  |  |  |
Billed |  | $ | 25.8 |  |  | $ | 40.2 |
Unbilled * |  | 8.7 |  |  | 9.2 |
Accounts receivable |  | $ | 34.5 |  |  | $ | 49.4 |
* 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 the customer and approved. 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.
|  | June 30, 2024 |  | December 31, 2023 |  | Year-To-Date Change
Deferred revenue - current |  | $ | 224.6 |  |  | $ | 252.4 |  |  | $ | (27.8) |
Advances from customers - current |  | $ | 32.8 |  |  | $ | 30.2 |  |  | $ | 2.6 |
Advances from customers - noncurrent |  | $ | — |  |  | $ | 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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