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Revenue and Contracts with Customers (Tables) | 6 Months Ended
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Jun. 30, 2019
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,
| 2019 |  | 2018 |  | 2019 |  | 2018
United States | $ | 2.6 |  |  | $ | 32.9 |  |  | $ | 37.7 |  |  | $ | 54.0 |
Foreign | — |  |  | — |  |  | — |  |  | 0.2 |
Revenue - SWU and uranium | $ | 2.6 |  |  | $ | 32.9 |  |  | $ | 37.7 |  |  | $ | 54.2 |
Contract with Customer, Asset and Liability | The following table represents changes in contract assets and contract liabilities balances (in millions):
|  | June 30, 2019 |  | December 31, 2018 |  | Year-To-Date Change
Contract assets |  |  |  |  |  |
Accounts receivable: |  |  |  |  |  |
Billed |  | $ | 20.1 |  |  | $ | 50.4 |  |  | $ | (30.3 | )
Unbilled |  | 5.6 |  |  | — |  |  | 5.6 |
Uranium feed receivable |  | 4.5 |  |  | 9.8 |  |  | (5.3 | )
Accounts receivable |  | $ | 30.2 |  |  | $ | 60.2 |  |  | $ | (30.0 | )
Deferred costs associated with deferred revenue |  | $ | 138.7 |  |  | $ | 134.9 |  |  | $ | 3.8 |
Contract liabilities |  |  |  |  |  |
Accounts payable and accrued liabilities |  | $ | 0.5 |  |  | $ | — |  |  | $ | 0.5 |
Deferred revenue - current |  | $ | 220.5 |  |  | $ | 204.5 |  |  | $ | 16.0 |
Advances from customers - current |  | $ | 46.7 |  |  | $ | — |  |  | $ | 46.7 |
Advances from customers - noncurrent |  | $ | 29.4 |  |  | $ | 15.0 |  |  | $ | 14.4 |

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- Definition Tabular disclosure of contract balances and changes in contract balances. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=109196051&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=115929826&loc=d3e9038-108599 + Details
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