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Revenue and Contracts with Customers (Tables) | 12 Months Ended
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Dec. 31, 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):
| Year Ended December 31,
| 2018 |  | 2017
United States | $ | 112.7 |  |  | $ | 111.5 |
Foreign: |  |  |
Belgium | 35.2 |  |  | 34.9 |
Japan | 3.1 |  |  | 49.0 |
Other | 13.4 |  |  | — |
Revenue - SWU and uranium | $ | 164.4 |  |  | $ | 195.4 |
The following table presents revenue from SWU and uranium sales disaggregated by geographical region based on the billing addresses of customers (in millions):
| Year Ended December 31,
| 2018 |  | 2017
United States | $ | 112.7 |  |  | $ | 111.5 |
Foreign: |  |  |
Belgium | 35.2 |  |  | 34.9 |
Japan | 3.1 |  |  | 49.0 |
Other | 13.4 |  |  | — |
Revenue - SWU and uranium | $ | 164.4 |  |  | $ | 195.4 |
Revenue by customer location, including customers in a foreign country representing 10% or more of total revenue, follows (in millions):
| Year Ended December 31,
| 2018 |  | 2017
United States | $ | 141.3 |  |  | $ | 134.5 |
Foreign: |  |  |
Belgium | 35.2 |  |  | 34.9 |
Japan | 3.1 |  |  | 49.0 |
Other | 13.4 |  |  | — |
Total foreign | 51.7 |  |  | 83.9 |
Total revenue | $ | 193.0 |  |  | $ | 218.4 |
Contract with Customer, Asset and Liability | The following table represents changes in the Company’s contract assets and contract liabilities balances (in millions):
|  | December 31, 2018 |  | January 1, 2018 |  | Year-To-Date Change
Contract assets |  |  |  |  |  |
Accounts receivable: |  |  |  |  |  |
Billed |  | $ | 50.4 |  |  | $ | 60.2 |  |  | $ | (9.8 | )
Uranium feed receivable |  | 9.8 |  |  | — |  |  | 9.8 |
Unbilled contract revenue |  | — |  |  | 0.1 |  |  | (0.1 | )
Accounts receivable |  | $ | 60.2 |  |  | $ | 60.3 |  |  | $ | (0.1 | )
Deferred costs associated with deferred revenue |  | $ | 134.9 |  |  | $ | 122.3 |  |  | $ | 12.6 |
Contract liabilities |  |  |  |  |  |
Deferred revenue and advances from customers - current: |  |  |  |  |  |
Deferred revenue |  | $ | 204.5 |  |  | $ | 172.5 |  |  | $ | 32.0 |
Advances from customers |  | — |  |  | 19.3 |  |  | (19.3 | )
Deferred revenue and advances from customers - current |  | $ | 204.5 |  |  | $ | 191.8 |  |  | $ | 12.7 |
Advances from customers - noncurrent |  | $ | 15.0 |  |  | $ | — |  |  | $ | 15.0 |
Deferred cost and deferred revenue activity for the year ended December 31, 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 | $ | 25.4 |  |  | $ | (12.8 | ) |  | $ | 12.6 |
Deferred revenue | 55.3 |  |  | (23.3 | ) |  | 32.0 |

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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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