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Revenue and Contracts with Customers (Tables) | 12 Months Ended
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Dec. 31, 2023
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, including foreign countries representing 10% or more of revenue, based on the billing addresses of customers (in millions):
| Year Ended December 31,
| 2023 |  | 2022 |  | 2021
United States | $ | 230.4 |  |  | $ | 96.1 |  |  | $ | 108.3 |
Foreign: |  |  |  |  |
Belgium | 0.1 |  |  | 38.3 |  |  | 36.6 |
Japan | 23.6 |  |  | 61.6 |  |  | 34.6 |
Other | 14.9 |  |  | 39.6 |  |  | 6.6 |
Total foreign | 38.6 |  |  | 139.5 |  |  | 77.8 |
Revenue - SWU and uranium | $ | 269.0 |  |  | $ | 235.6 |  |  | $ | 186.1 |
Revenue by customer location, including customers in a foreign country representing 10% or more of total revenue, follows (in millions):
| Year Ended December 31,
| 2023 |  | 2022 |  | 2021
United States | $ | 281.6 |  |  | $ | 154.3 |  |  | $ | 220.5 |
Foreign: |  |  |  |  |
Belgium | 0.1 |  |  | 38.3 |  |  | 36.6 |
Japan | 23.6 |  |  | 61.6 |  |  | 34.6 |
Other | 14.9 |  |  | 39.6 |  |  | 6.6 |
Total foreign | 38.6 |  |  | 139.5 |  |  | 77.8 |
Total revenue | $ | 320.2 |  |  | $ | 293.8 |  |  | $ | 298.3 |
Contract with Customer, Asset and Liability | The following table presents changes in contract liability balances (in millions):
|  | December 31, |  |
|  | 2023 |  | 2022 |  | Change
Accrued losses on HALEU Operation Contract: |  |  |  |  |  |
Current - Accounts payable and accrued liabilities |  | $ | — |  |  | $ | 20.0 |  |  | $ | (20.0) |
Deferred revenue - current |  | $ | 252.4 |  |  | $ | 258.4 |  |  | $ | (6.0) |
Advances from customers - current |  | $ | 30.2 |  |  | $ | 14.8 |  |  | $ | 15.4 |
Advances from customers - non current |  | $ | 32.8 |  |  | $ | 46.2 |  |  | $ | (13.4) |

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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 -Name Accounting Standards Codification -Section 50 -Paragraph 41 -Subparagraph a -SubTopic 10 -Topic 280 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-41 + Details
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