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Revenue Recognition and Contracts with Customers (Tables) | 9 Months Ended
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Sep. 30, 2018
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,
| 2018 |  | 2017 |  | 2018 |  | 2017
United States | $ | 0.3 |  |  | $ | 26.2 |  |  | $ | 54.3 |  |  | $ | 37.1 |
Europe | 28.6 |  |  | 17.3 |  |  | 28.7 |  |  | 17.4 |
Asia | — |  |  | — |  |  | 0.1 |  |  | 27.7 |
Revenue - SWU and uranium | $ | 28.9 |  |  | $ | 43.5 |  |  | $ | 83.1 |  |  | $ | 82.2 |
Contract with Customer, Asset and Liability | The following table represents changes in our contract assets and contract liabilities balances (in millions):
|  | September 30, 2018 |  | January 1, 2018 |  | Year-To-Date Change
Contract assets |  |  |  |  |  |
Accounts receivable: |  |  |  |  |  |
Billed |  | $ | 2.5 |  |  | $ | 60.2 |  |  | $ | (57.7 | )
Unbilled contract revenue |  | — |  |  | 0.1 |  |  | (0.1 | )
Accounts receivable |  | $ | 2.5 |  |  | $ | 60.3 |  |  | $ | (57.8 | )
Deferred costs associated with deferred revenue |  | $ | 122.7 |  |  | $ | 122.3 |  |  | $ | 0.4 |
Contract liabilities |  |  |  |  |  |
Deferred revenue and advances from customers - current: |  |  |  |  |  |
Deferred revenue |  | $ | 175.6 |  |  | $ | 172.5 |  |  | $ | 3.1 |
Advances from customers |  | — |  |  | 19.3 |  |  | (19.3 | )
Deferred revenue and advances from customers - current |  | $ | 175.6 |  |  | $ | 191.8 |  |  | $ | (16.2 | )
Advances from customers - noncurrent |  | $ | 14.5 |  |  | $ | — |  |  | $ | 14.5 |
Deferred cost and deferred revenue activity in the nine months ended September 30, 2018, follows (in millions):
| Deferred Sales in the Period |  | Previously Deferred Sales Recognized in the Period |  | Year-To-Date Change
Deferred costs associated with deferred revenue | $ | 10.6 |  |  | $ | (10.2 | ) |  | $ | 0.4 |
Deferred revenue | 23.3 |  |  | (20.2 | ) |  | 3.1 |

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- Definition Tabular disclosure of contract balances and changes in contract balances. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=82913847&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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -Subparagraph a -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e9038-108599 + Details
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