The exercise price of outstanding share options.

Name:	ifrs-full_ExercisePriceOfOutstandingShareOptions
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

- Definition

The number of share options outstanding in a share-based payment arrangement.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 2
-IssueDate 2017-01-01
-Paragraph 45
-Subparagraph d
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2017-03-01&anchor=para_45_d&doctype=Standard
-URIDate 2017-03-09

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 2
-IssueDate 2017-01-01
-Paragraph 45
-Subparagraph b
-Clause i
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2017-03-01&anchor=para_45_b_i&doctype=Standard
-URIDate 2017-03-09

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 2
-IssueDate 2017-01-01
-Paragraph 45
-Subparagraph b
-Clause vi
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2017-03-01&anchor=para_45_b_vi&doctype=Standard
-URIDate 2017-03-09

+ Details

Name:	ifrs-full_NumberOfOutstandingShareOptions
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

- Definition

The number of share options exercisable in a share-based payment arrangement.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 2
-IssueDate 2017-01-01
-Paragraph 45
-Subparagraph b
-Clause vii
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2017-03-01&anchor=para_45_b_vii&doctype=Standard
-URIDate 2017-03-09

+ Details

Name:	ifrs-full_NumberOfShareOptionsExercisableInSharebasedPaymentArrangement
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

- Definition

The weighted average exercise price of share options exercisable in a share-based payment arrangement. [Refer: Weighted average [member]]

+ References

+ Details

Name:	ifrs-full_WeightedAverageExercisePriceOfShareOptionsExercisableInSharebasedPaymentArrangement
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

- Definition

The weighted average exercise price of share options outstanding in a share-based payment arrangement. [Refer: Weighted average [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 2
-IssueDate 2017-01-01
-Paragraph 45
-Subparagraph b
-Clause i
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2017-03-01&anchor=para_45_b_i&doctype=Standard
-URIDate 2017-03-09

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 2
-IssueDate 2017-01-01
-Paragraph 45
-Subparagraph b
-Clause vi
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2017-03-01&anchor=para_45_b_vi&doctype=Standard
-URIDate 2017-03-09

+ Details

Name:	ifrs-full_WeightedAverageExercisePriceOfShareOptionsOutstandingInSharebasedPaymentArrangement
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

- Definition

Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	kgc_IfrsShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm
Namespace Prefix:	kgc_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	kgc_IfrsShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm
Namespace Prefix:	kgc_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- References

No definition available.

+ Details

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

- References

No definition available.

+ Details

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

- Details

Name:	ifrs-full_TypesOfSharebasedPaymentArrangementsAxis=us-gaap_EmployeeStockOptionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_RangesOfExercisePricesForOutstandingShareOptionsAxis=kgc_ExercisePrice2.96To4.22Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_RangesOfExercisePricesForOutstandingShareOptionsAxis=kgc_ExercisePrice4.23To9.53Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_RangesOfExercisePricesForOutstandingShareOptionsAxis=kgc_ExercisePrice9.54To14.31Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_RangesOfExercisePricesForOutstandingShareOptionsAxis=kgc_ExercisePrice14.32To16.25Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_RangeAxis=ifrs-full_BottomOfRangeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_RangeAxis=ifrs-full_TopOfRangeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

SHARE-BASED PAYMENTS - Share option plan stock options outstanding (Details) - Share options Options in Thousands	12 Months Ended
	Dec. 31, 2017 CAD ($) Options	Dec. 31, 2016 CAD ($) Options	Dec. 31, 2015 CAD ($) Options
Share options outstanding
Number of options \| Options	12,173	12,429	13,513
Weighted average exercise price	$ 6.52	$ 6.95	$ 7.57
Weighted average remaining contractual life (years)	3 years 2 months 16 days
Share options exercisable
Exercisable at end of period \| Options	8,539	7,911
Weighted average exercise price	$ 7.41	$ 8.51
Weighted average remaining contractual life (years)	2 years 4 months 10 days
$2.96 - $4.22
Share options outstanding
Number of options \| Options	4,169
Weighted average exercise price	$ 3.87
Weighted average remaining contractual life (years)	4 years 1 month 13 days
Share options exercisable
Exercisable at end of period \| Options	2,151
Weighted average exercise price	$ 3.81
Weighted average remaining contractual life (years)	3 years 9 months 22 days
$4.23 - $9.53
Share options outstanding
Number of options \| Options	6,145
Weighted average exercise price	$ 6.41
Weighted average remaining contractual life (years)	3 years 3 months 26 days
Share options exercisable
Exercisable at end of period \| Options	4,528
Weighted average exercise price	$ 6.89
Weighted average remaining contractual life (years)	2 years 3 months 22 days
$9.54 - $14.31
Share options outstanding
Number of options \| Options	1,140
Weighted average exercise price	$ 10.70
Weighted average remaining contractual life (years)	1 year 2 months 12 days
Share options exercisable
Exercisable at end of period \| Options	1,141
Weighted average exercise price	$ 10.70
Weighted average remaining contractual life (years)	1 year 2 months 12 days
$14.32 - $16.25
Share options outstanding
Number of options \| Options	719
Weighted average exercise price	$ 16.25
Weighted average remaining contractual life (years)	1 month 24 days
Share options exercisable
Exercisable at end of period \| Options	719
Weighted average exercise price	$ 16.25
Weighted average remaining contractual life (years)	1 month 24 days
Minimum \| $2.96 - $4.22
Share options outstanding
Exercise price range	$ 2.96
Minimum \| $4.23 - $9.53
Share options outstanding
Exercise price range	4.23
Minimum \| $9.54 - $14.31
Share options outstanding
Exercise price range	9.54
Minimum \| $14.32 - $16.25
Share options outstanding
Exercise price range	14.32
Maximum \| $2.96 - $4.22
Share options outstanding
Exercise price range	4.22
Maximum \| $4.23 - $9.53
Share options outstanding
Exercise price range	9.53
Maximum \| $9.54 - $14.31
Share options outstanding
Exercise price range	14.31
Maximum \| $14.32 - $16.25
Share options outstanding
Exercise price range	$ 16.25