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Significant accounting principles and policies (Details Textual) $ in Millions | Jan. 01, 2019 USD ($) | Dec. 31, 2018 | Dec. 31, 2017
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Property, Plant and Equipment [Member] |  |  |
DisclosureOfSummaryOfSignificantAccountingPoliciesExplanatory [Line Items] |  |  |
Right-of-use assets | $ 96.8 |  |
Other financial liabilities [Member] |  |  |
DisclosureOfSummaryOfSignificantAccountingPoliciesExplanatory [Line Items] |  |  |
Lease liabilities | $ 95.7 |  |
Written put options [member] |  |  |
DisclosureOfSummaryOfSignificantAccountingPoliciesExplanatory [Line Items] |  |  |
Closing foreign exchange rate |  | 0.2959 | 0.3082
Purchased call options [member] |  |  |
DisclosureOfSummaryOfSignificantAccountingPoliciesExplanatory [Line Items] |  |  |
Closing foreign exchange rate |  | 0.2968 | 0.3088
Sociedad Minera Cerro Verde S.A.A. [Member] | Written put options [member] |  |  |
DisclosureOfSummaryOfSignificantAccountingPoliciesExplanatory [Line Items] |  |  |
Closing foreign exchange rate |  | 3.379 | 3.245
Sociedad Minera Cerro Verde S.A.A. [Member] | Purchased call options [member] |  |  |
DisclosureOfSummaryOfSignificantAccountingPoliciesExplanatory [Line Items] |  |  |
Closing foreign exchange rate |  | 3.369 | 3.238

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- Definition The spot exchange rate at the end of the reporting period. Exchange rate is the ratio of exchange for two currencies. Spot exchange rate is the exchange rate for immediate delivery. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_112_c&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The amount of liabilities related to the entity's leases. Lease is a contract, or part of a contract, that conveys the right to use an underlying asset for a period of time in exchange for consideration. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2019-01-01 -Name IFRS -Number 16 -IssueDate 2018-01-01 -Paragraph 47 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=16&date=2018-03-01&anchor=para_47_b&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The amount of assets that represent a lessee's right to use an underlying asset for the lease term. Underlying asset is an asset that is the subject of a lease, for which the right to use that asset has been provided by a lessor to a lessee. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2019-01-01 -Name IFRS -Number 16 -IssueDate 2018-01-01 -Paragraph 53 -Subparagraph j -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=16&date=2018-03-01&anchor=para_53_j&doctype=Standard -URIDate 2018-03-16 + Details
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