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INCOME TAXES: (Details 3) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Mar. 31, 2009
Assets:
Inventories	$ 32.5us-gaap_DeferredTaxAssetsInventory	$ 18.7us-gaap_DeferredTaxAssetsInventory
Capitalized exploration expenses	27.8scco_DeferredTaxAssetsCapitalizedExplorationExpenses	29.4scco_DeferredTaxAssetsCapitalizedExplorationExpenses
U.S. foreign tax credit carryforward, net of FIN 48 liability	144.8us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsForeign	52.6us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsForeign
U.S. tax effect of Peruvian deferred tax liability	251.4scco_DeferredTaxAssetsTaxEffectOfPeruvianDeferredTaxLiability	68.0scco_DeferredTaxAssetsTaxEffectOfPeruvianDeferredTaxLiability
Reserves	101.7us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals	35.0us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals
Other	19.8us-gaap_DeferredTaxAssetsOther	27.9us-gaap_DeferredTaxAssetsOther
Total deferred tax assets	578.0us-gaap_DeferredTaxAssetsNet	231.6us-gaap_DeferredTaxAssetsNet
Liabilities:
Property, plant and equipment	(213.0)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment	(105.8)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Deferred charges	(74.9)us-gaap_DeferredTaxLiabilitiesDeferredExpense	(79.6)us-gaap_DeferredTaxLiabilitiesDeferredExpense
Mexican tax on consolidated dividends	(5.7)scco_DeferredTaxLiabilitiesMexicanTaxOnConsolidatedDividends	(31.5)scco_DeferredTaxLiabilitiesMexicanTaxOnConsolidatedDividends
Outside basis difference		(7.4)scco_OutsideBasisDifference
Other	(9.8)us-gaap_DeferredTaxLiabilitiesOther	(0.1)us-gaap_DeferredTaxLiabilitiesOther
Total deferred tax liabilities	(303.4)us-gaap_DeferredTaxLiabilities	(224.4)us-gaap_DeferredTaxLiabilities
Total net deferred tax assets / (liabilities)	274.6us-gaap_DeferredTaxAssetsLiabilitiesNet	7.2us-gaap_DeferredTaxAssetsLiabilitiesNet
Other U.S. tax credits	$ 0us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsOther
Related party transactions
Percentage of ownership interest held by the parent company	84.60%scco_PercentageOfOwnershipByParent	82.30%scco_PercentageOfOwnershipByParent
AMC | Minimum
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