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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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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

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-Name Accounting Standards Codification
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The aggregate amount of receivables to be collected from related parties where one party can exercise control or significant influence over another party; including affiliates, owners or officers and their immediate families, pension trusts, and so forth, at the financial statement date. which are usually due within one year (or one business cycle).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(k)(1))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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