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v3.19.1

Revenue and Contracts with Customers (Contract with Customer Asset and Liability) (Details) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Jun. 30, 2018 | Jan. 01, 2018
Revenue from Contract with Customer [Abstract] |  |  |  |  |
Billed accounts receivable | $ 50.4 | $ 50.4 |  |  | $ 60.2
Billed accounts receivable – increase (decrease) | (9.8) |  |  |  |
Uranium feed receivable | 9.8 | 9.8 |  |  |
Uranium feed receivable - increase (decrease) | 9.8 |  |  |  |
Unbilled contract revenue | 0.0 | 0.0 |  |  | 0.1
Unbilled receivables – increase (decrease) | (0.1) |  |  |  |
Accounts receivable, net | 60.2 | 60.2 | $ 60.2 |  | 60.3
Accounts receivable – increase (decrease) | (0.1) | (9.7) | 17.6 |  |
Deferred costs associated with deferred revenue | 134.9 | 134.9 | 122.3 |  | 122.3
Deferred costs – increase (decrease) | 12.6 |  |  |  |
Deferred revenue | 204.5 | 204.5 |  |  | 172.5
Deferred revenue – increase (decrease) | 32.0 |  |  |  |
Advances from customers | 0.0 | 0.0 |  |  | 19.3
Customer advances – increase (decrease) | (19.3) |  |  |  |
Deferred revenue and advances from customers | 204.5 | 204.5 | 191.8 |  | $ 191.8
Deferred revenue and customer advances – increase (decrease) | 12.7 |  |  |  |
Advances from customers, noncurrent | 15.0 | 15.0 | $ 0.0 | $ 14.5 |
Advances from customers, noncurrent - increase (decrease) | $ 15.0 |  |  |  |
Deferred costs, additions |  | 25.4 |  |  |
Deferred costs, costs recognized |  | (12.8) |  |  |
Deferred revenue, additions |  | 55.3 |  |  |
Deferred revenue, revenue recognized |  | $ (23.3) |  |  |

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- Definition Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130549-203045 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(3)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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