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SHARE-BASED PAYMENTS - Employee share purchase plans (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Employee share purchase plan |  |
Total share-based compensation | $ 29.0 | $ 30.0
ESPP |  |
Employee share purchase plan |  |
Maximum contribution of annual base salary of employees (as a percent) | 10.00% |
Employer contributions (as a percent) | 50.00% |
Total share-based compensation | $ 2.0 | $ 2.0

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

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- Definition The percentage of employer contributions in share based payment arrangement. + References No definition available. + Details
Name: | kgc_PercentageOfContributionsByEmployerInShareBasedPaymentArrangement
Namespace Prefix: | kgc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition The maximum percentage of employee contribution of annual base salary to acquire common shares. + References No definition available. + Details
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Namespace Prefix: | kgc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Represents the expense recognised during the period arising from share based payments. + References No definition available. + Details
Name: | kgc_ShareBasedPaymentsExpense
Namespace Prefix: | kgc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | ifrs-full_TypesOfSharebasedPaymentArrangementsAxis=kgc_EmployeeSharePurchasePlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |