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Revenue and Contracts with Customers (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Dec. 31, 2018
Advances from customers, noncurrent | $ 29.4 | $ 14.5 | $ 29.4 | $ 15.0
Separative work units owed to others noncurrent | 7.3 |  | 7.3 |
Government cost share portion | 115.0 |  | 115.0 |
Company cost share portion | 29.0 |  | 29.0 |
Government cost obligation | 18.6 |  | 18.6 |
Government spending authorization | 6.4 |  | 6.4 |
Loss on contracts | 0.5 |  | 0.5 |
Accounts receivable, net | 30.2 |  | 30.2 | 60.2
Government [Member] |  |  |  |
Proceeds from Customers |  | 4.7 |  |
Advances from customers |  |  |  | 19.3
Gain (loss) related to litigation settlement |  | $ 9.5 |  |
Low Enriched Uranium Segment [Member] |  |  |  |
Revenue, remaining performance obligation, amount | $ 1,100.0 |  | $ 1,100.0 | $ 1,000.0

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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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