XML 98 R67.htm IDEA: XBRL DOCUMENT
v3.19.3.a.u2

BENEFIT PLANS: - Post retirement (Details) - Post retirement defined benefit plans and defined contribution plan $ / shares in Units, $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 USD ($) entity $ / shares | Dec. 31, 2018
Expatriate Plan |  |
Benefit plans |  |
Net asset value (in dollars per share) | $ / shares | $ 1.00 |
Mexican Health Plan |  |
Assumptions used to determine the pension obligation and other post-retirement benefits and cost |  |
Number of financial institutions managing plan assets | entity | 3 |
Plan obligations as a percentage of benefit obligation | 100.00% |
Asset allocation (as a percent) | 100.00% | 100.00%
Expected employer contribution in next fiscal year | $ 2.5 |
Pending payments to former Buenavista workers | $ 1.7 |
Parent Company (Grupo Mexico) common shares | Mexican Health Plan |  |
Assumptions used to determine the pension obligation and other post-retirement benefits and cost |  |
Asset allocation (as a percent) | 20.00% |
Treasury bills | Mexican Health Plan |  |
Assumptions used to determine the pension obligation and other post-retirement benefits and cost |  |
Asset allocation (as a percent) | 80.00% | 78.00%
Equity securities | Mexican Health Plan |  |
Assumptions used to determine the pension obligation and other post-retirement benefits and cost |  |
Asset allocation (as a percent) | 20.00% | 22.00%

X
- Definition Represents the buyout payments outstanding to workers under defined benefit plans. + References No definition available. + Details
Name: | scco_DefinedBenefitPlanBuyoutPaymentsOutstandingToWorkers
Namespace Prefix: | scco_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Represents the number of financial institutions managing the plan assets. + References No definition available. + Details
Name: | scco_DefinedBenefitPlanNumberOfFinancialInstitutionsManagingPlanAssets
Namespace Prefix: | scco_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the plan obligation as a percentage of the entity's aggregate defined benefit obligation. + References No definition available. + Details
Name: | scco_DefinedBenefitPlanPlanObligationAsPercentageOfBenefitObligation
Namespace Prefix: | scco_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | scco_DefinedBenefitPlanWeightedAverageAssumptionsUsedInCalculatingBenefitObligationAndNetPeriodicBenefitCostAbstract
Namespace Prefix: | scco_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_DefinedBenefitPlanDisclosureLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of contributions expected to be received by defined benefit plan from employer in next fiscal year following latest fiscal year. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
Name: | us-gaap_DefinedBenefitPlanExpectedFutureEmployerContributionsNextFiscalYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Percentage of actual investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(i) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
Name: | us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Net asset value per share or per unit of investments in certain entities that calculate net asset value per share. Includes, but is not limited to, by unit, membership interest, or other ownership interest. Investment includes, but is not limited to, investment in certain hedge funds, venture capital funds, private equity funds, real estate partnerships or funds. Excludes fair value disclosure. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 35 -Paragraph 54B -URI http://asc.fasb.org/extlink&oid=117332851&loc=SL7495116-110257 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 205 -Section 50 -Paragraph 7 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=25866437&loc=d3e10246-115837 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 205 -Section 50 -Paragraph 7 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=25866437&loc=d3e10246-115837 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 6A -URI http://asc.fasb.org/extlink&oid=117815213&loc=SL6742756-110258 Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 35 -Paragraph 59 -URI http://asc.fasb.org/extlink&oid=117332851&loc=SL6740821-110257 + Details
Name: | us-gaap_NetAssetValuePerShare
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_RetirementPlanTypeAxis=us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PlanNameAxis=scco_ExpatriatePlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PlanNameAxis=scco_MexicanPlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ConsolidatedEntitiesAxis=scco_HoldingCompanyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=scco_MexicanTreasuryBillSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_EquitySecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |