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CONSOLIDATED FINANCIAL STATEMENT DETAILS - Restricted Cash (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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CONSOLIDATED FINANCIAL STATEMENT DETAILS |  |
Restricted cash | $ 13.7 | $ 15.2

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- Definition The amount of cash and cash equivalents whose use or withdrawal is restricted. [Refer: Cash and cash equivalents] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_55&doctype=Standard -URIDate 2020-01-01 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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