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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Share-based payments (Details)	12 Months Ended
	Dec. 31, 2018 item
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
Number of trading sessions	20

X

- Definition

Number of most recent trading sessions that the weighted average cost of ESPP are based on.

+ References

No definition available.

+ Details

Name:	kgc_NumberOfTradingSessions
Namespace Prefix:	kgc_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

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- Definition

This concept does not have any references.

+ References

No definition available.

+ Details

Name:	kgc_SummaryOfSignificantAccountingPoliciesAbstract
Namespace Prefix:	kgc_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration