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REVENUE RECOGNITION: - Receivables by reporting segment (Details) - USD ($) $ in Millions | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Opening and closing balances of receivables |  |
Trade receivables | $ 873.9 | $ 890.6
Related parties | 66.1 | 26.1
Corporate, other and eliminations |  |
Opening and closing balances of receivables |  |
Related parties | 8.0 | 8.1
Mexican Open-pit | Operating segment |  |
Opening and closing balances of receivables |  |
Trade receivables | 539.7 | 556.2
Related parties | 58.1 | 18.0
Mexican IMMSA Unit | Operating segment |  |
Opening and closing balances of receivables |  |
Trade receivables | 71.7 | 79.7
Peruvian Operations | Operating segment |  |
Opening and closing balances of receivables |  |
Trade receivables | $ 262.5 | $ 254.7

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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/presentationRef -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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(4)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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