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Revenue and Contracts with Customers (Tables) | 6 Months Ended
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Jun. 30, 2021
Revenue from Contract with Customer [Abstract] |
Revenue from External Customers by Geographic Areas | The following table presents revenue from separative work units (“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,
| 2021 |  | 2020 |  | 2021 |  | 2020
United States | $ | 45.2 |  |  | $ | 43.1 |  |  | $ | 54.8 |  |  | $ | 50.4 |
Foreign | — |  |  | 20.3 |  |  | 28.5 |  |  | 43.7 |
Revenue - SWU and uranium | $ | 45.2 |  |  | $ | 63.4 |  |  | $ | 83.3 |  |  | $ | 94.1 |
Contract with Customer, Asset and Liability |
|  | June 30, 2021 |  | December 31, 2020 |  | Year-To-Date Change
Accrued loss on HALEU Contract: |  |  |  |  |  |
Current - Accounts payable and accrued liabilities |  | $ | 3.1 |  |  | $ | 7.0 |  |  | $ | (3.9) |
Noncurrent - Other long-term liabilities |  | $ | — |  |  | $ | 0.7 |  |  | $ | (0.7) |
Deferred revenue - current |  | $ | 259.1 |  |  | $ | 281.7 |  |  | $ | (22.6) |
Advances from customers - current |  | $ | 16.9 |  |  | $ | 1.5 |  |  | $ | 15.4 |
Advances from customers - noncurrent |  | $ | 45.1 |  |  | $ | 45.2 |  |  | $ | (0.1) |

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130551-203045 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -Subparagraph a -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9038-108599 + Details
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