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INCOME TAXES: (Details 4) (USD $) In Millions, unless otherwise specified | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Foreign tax credits |  |  |  |
Unrecognized tax benefits | $ 319.4 us-gaap_UnrecognizedTaxBenefits | $ 221.2 us-gaap_UnrecognizedTaxBenefits | $ 221.2 us-gaap_UnrecognizedTaxBenefits | $ 70.6 us-gaap_UnrecognizedTaxBenefits
Foreign |  |  |  |
Foreign tax credits |  |  |  |
Tax credits carryback period | 1 year |  |  |
Tax credits carryforward period | 10 years |  |  |
Foreign tax credit carryforward | 447.0 us-gaap_TaxCreditCarryforwardAmount / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember |  |  |
Unrecognized tax benefits | 302.2 us-gaap_UnrecognizedTaxBenefits / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember |  |  |
Foreign tax credit carryforward net of unrecognized | 144.8 scco_TaxCarryforwardNetOfUnrecognizedTaxBenefit / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember |  |  |
2016 | Foreign |  |  |  |
Foreign tax credits |  |  |  |
Foreign tax credit carryforward | 19.0 us-gaap_TaxCreditCarryforwardAmount / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember / us-gaap_TaxCreditCarryforwardAxis = scco_TaxCreditCarryforwardExpirationDate2016Member |  |  |
2018 | Foreign |  |  |  |
Foreign tax credits |  |  |  |
Foreign tax credit carryforward | 20.4 us-gaap_TaxCreditCarryforwardAmount / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember / us-gaap_TaxCreditCarryforwardAxis = scco_TaxCreditCarryforwardExpirationDate2018Member |  |  |
2019 | Foreign |  |  |  |
Foreign tax credits |  |  |  |
Foreign tax credit carryforward | 63.7 us-gaap_TaxCreditCarryforwardAmount / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember / us-gaap_TaxCreditCarryforwardAxis = scco_TaxCreditCarryForwardExpirationDate2019Member |  |  |
2020 | Foreign |  |  |  |
Foreign tax credits |  |  |  |
Foreign tax credit carryforward | 42.0 us-gaap_TaxCreditCarryforwardAmount / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember / us-gaap_TaxCreditCarryforwardAxis = scco_TaxCreditCarryforwardExpirationDate2020Member |  |  |
2021 | Foreign |  |  |  |
Foreign tax credits |  |  |  |
Foreign tax credit carryforward | 11.7 us-gaap_TaxCreditCarryforwardAmount / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember / us-gaap_TaxCreditCarryforwardAxis = scco_TaxCreditCarryforwardExpirationDate2021Member |  |  |
2022 | Foreign |  |  |  |
Foreign tax credits |  |  |  |
Foreign tax credit carryforward | 84.1 us-gaap_TaxCreditCarryforwardAmount / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember / us-gaap_TaxCreditCarryforwardAxis = scco_TaxCreditCarryforwardExpirationDate2022Member |  |  |
2023 | Foreign |  |  |  |
Foreign tax credits |  |  |  |
Foreign tax credit carryforward | 69.2 us-gaap_TaxCreditCarryforwardAmount / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember / us-gaap_TaxCreditCarryforwardAxis = scco_TaxCreditCarryforwardExpirationDate2023Member |  |  |
Foreign tax credit carryforward net of unrecognized | 7.9 scco_TaxCarryforwardNetOfUnrecognizedTaxBenefit / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember / us-gaap_TaxCreditCarryforwardAxis = scco_TaxCreditCarryforwardExpirationDate2023Member |  |  |
2024 | Foreign |  |  |  |
Foreign tax credits |  |  |  |
Foreign tax credit carryforward | 136.9 us-gaap_TaxCreditCarryforwardAmount / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember / us-gaap_TaxCreditCarryforwardAxis = scco_TaxCreditCarryForwardExpirationDate2024Member |  |  |
Foreign tax credit carryforward net of unrecognized | $ 136.9 scco_TaxCarryforwardNetOfUnrecognizedTaxBenefit / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember / us-gaap_TaxCreditCarryforwardAxis = scco_TaxCreditCarryForwardExpirationDate2024Member |  |  |

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