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Revenue and Contracts with Customers (Contract with Customer Asset and Liability) (Details) - USD ($) $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2019 | Dec. 31, 2018 | Jun. 30, 2018
Revenue from Contract with Customer [Abstract] |  |  |
Billed accounts receivable | $ 39.5 | $ 50.4 |
Billed accounts receivable – increase (decrease) | (10.9) |  |
Uranium feed receivable | 0.0 | 9.8 |
Uranium feed receivable - increase (decrease) | (9.8) |  |
Accounts receivable, net | 39.5 | 60.2 |
Accounts receivable - increase (decrease) | (20.7) |  |
Deferred costs associated with deferred revenue | 134.9 | 134.9 |
Deferred costs – increase (decrease) | 0.0 |  |
Deferred revenue | 204.5 | 204.5 |
Deferred revenue – increase (decrease) | 0.0 |  |
Deferred revenue and advances from customers | 204.5 | 204.5 |
Advances from customers, noncurrent | 15.0 | $ 15.0 | $ 14.5
Advances from customers, noncurrent - increase (decrease) | $ 0.0 |  |

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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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- Definition Amounts due for billed services rendered or to be rendered, actions taken or to be taken, or a promise to refrain from taking certain actions in accordance with the terms of a legally binding agreement between the Company and, at a minimum, one other party. An example would be amounts billed to customers under contracts or programs but not paid as of the balance sheet date. + References Reference 1: 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(c)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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