Aggregate number of common shares reserved for future issuance.

No definition available.

Name:	aem_CommonStockReservedForFutureIssuance
Namespace Prefix:	aem_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Range of exercise prices and number and weighted average remaining contractual life of stock options.

+ References

No definition available.

+ Details

Name:	aem_DisclosureOfRangeOfExercisePricesAndNumberAndWeightedAverageRemainingContractualLifeOfStockOptionsAbstract
Namespace Prefix:	aem_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Expense from share-based payment transactions in which goods or services received qualify for recognition as assets in property, plant and mine development.

+ References

No definition available.

+ Details

Name:	aem_ExpenseFromShareBasedPaymentTransactionsInWhichGoodsOrServicesReceivedQualifyForRecognitionAsAssetsInPropertyPlantAndMineDevelopment
Namespace Prefix:	aem_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

+ References

No definition available.

+ Details

Name:	aem_IfrsShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
Namespace Prefix:	aem_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

n/a

+ References

No definition available.

+ Details

Name:	aem_SignificantAssumptionsUsedToEstimateFairValueOfStockOptionsAbstract
Namespace Prefix:	aem_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The weighted average remaining contractual life of exercisable share options.

+ References

No definition available.

+ Details

Name:	aem_WeightedAverageRemainingContractualLifeOfExercisableShareOptions
Namespace Prefix:	aem_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

The expected volatility of the share price used to calculate the fair value of the share options granted. Expected volatility is a measure of the amount by which a price is expected to fluctuate during a period. The measure of volatility used in option pricing models is the annualised standard deviation of the continuously compounded rates of return on the share over a period of time.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 2
-IssueDate 2019-01-01
-Paragraph 47
-Subparagraph a
-Clause i
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2019-en-r&anchor=para_47_a_i&doctype=Standard
-URIDate 2019-03-27

+ Details

Name:	ifrs-full_DescriptionOfExpectedVolatilityShareOptionsGranted
Namespace Prefix:	ifrs-full_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The option life of share options granted.

+ References

+ Details

Name:	ifrs-full_DescriptionOfOptionLifeShareOptionsGranted
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	duration

- Definition

The implied yield currently available on zero-coupon government issues of the country in whose currency the exercise price for share options granted is expressed, with a remaining term equal to the expected term of the option being valued (based on the option's remaining contractual life and taking into account the effects of expected early exercise). [Refer: Government [member]]

+ References

+ Details

Name:	ifrs-full_DescriptionOfRiskFreeInterestRateShareOptionsGranted
Namespace Prefix:	ifrs-full_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The exercise price of outstanding share options.

+ References

+ Details

Name:	ifrs-full_ExercisePriceOfOutstandingShareOptions2019
Namespace Prefix:	ifrs-full_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

The percentage of an expected dividend used to calculate the fair value of share options granted.

+ References

+ Details

Name:	ifrs-full_ExpectedDividendAsPercentageShareOptionsGranted
Namespace Prefix:	ifrs-full_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The amount of expense arising from share-based payment transactions in which the goods or services received did not qualify for recognition as assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 2
-IssueDate 2019-01-01
-Paragraph 51
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2019-en-r&anchor=para_51_a&doctype=Standard
-URIDate 2019-03-27

+ Details

Name:	ifrs-full_ExpenseFromSharebasedPaymentTransactionsInWhichGoodsOrServicesReceivedDidNotQualifyForRecognitionAsAssets
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- 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 2019-01-01
-Paragraph 45
-Subparagraph d
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2019-en-r&anchor=para_45_d&doctype=Standard
-URIDate 2019-03-27

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 2
-IssueDate 2019-01-01
-Paragraph 45
-Subparagraph b
-Clause i
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2019-en-r&anchor=para_45_b_i&doctype=Standard
-URIDate 2019-03-27

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 2
-IssueDate 2019-01-01
-Paragraph 45
-Subparagraph b
-Clause vi
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2019-en-r&anchor=para_45_b_vi&doctype=Standard
-URIDate 2019-03-27

+ 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 2019-01-01
-Paragraph 45
-Subparagraph b
-Clause vii
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2019-en-r&anchor=para_45_b_vii&doctype=Standard
-URIDate 2019-03-27

+ 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_WeightedAverageExercisePriceOfShareOptionsExercisableInSharebasedPaymentArrangement2019
Namespace Prefix:	ifrs-full_
Data Type:	num:perShareItemType
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 2019-01-01
-Paragraph 45
-Subparagraph b
-Clause i
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2019-en-r&anchor=para_45_b_i&doctype=Standard
-URIDate 2019-03-27

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 2
-IssueDate 2019-01-01
-Paragraph 45
-Subparagraph b
-Clause vi
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2019-en-r&anchor=para_45_b_vi&doctype=Standard
-URIDate 2019-03-27

+ Details

Name:	ifrs-full_WeightedAverageExercisePriceOfShareOptionsOutstandingInSharebasedPaymentArrangement2019
Namespace Prefix:	ifrs-full_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

The weighted average remaining contractual life of outstanding share options. [Refer: Weighted average [member]]

+ References

+ Details

Name:	ifrs-full_WeightedAverageRemainingContractualLifeOfOutstandingShareOptions2019
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Details

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

- Details

Name:	ifrs-full_RangesOfExercisePricesForOutstandingShareOptionsAxis=aem_ExercisePriceRange28.92To36.37Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_RangesOfExercisePricesForOutstandingShareOptionsAxis=aem_ExercisePriceRange55.10To66.57Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_RangesOfExercisePricesForOutstandingShareOptionsAxis=aem_ExercisePriceRange28.92To66.57Member
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:

STOCK-BASED COMPENSATION - Stock options exercisable (Details) - Ifrs Employee Stock Option [Member] $ in Millions	12 Months Ended
	Dec. 31, 2019 USD ($) Y	Dec. 31, 2018 USD ($) Y	Dec. 31, 2019 Options $ / shares shares	Dec. 31, 2018 Options $ / shares	Dec. 31, 2017 Options $ / shares
Range of exercise prices and number and weighted average remaining contractual life of stock options
Number of stock options outstanding \| Options			4,122,300	6,361,265	5,857,504
Weighted average exercise price of outstanding stock options			$ 54.86	$ 47.65	$ 41.18
Number of exercisable stock options \| Options			1,195,730	3,429,813
Weighted average exercise price of exercisable stock options			$ 51.39	$ 42.28
Common stock reserved for future issuance \| shares			4,122,300
Number of common shares available for grant \| shares			5,071,614
Significant assumptions used to estimate the fair value of stock options
Risk-free interest rate	2.23%	2.10%
Expected life of stock options (in years) \| Y	2.4	2.4
Expected volatility (as a percent)	30.00%	35.00%
Expected dividend yield	1.20%	1.00%
Total compensation expense recorded in the general and administrative \| $	$ 16.8	$ 19.8
Share based compensation cost capitalized as part of the property, plant and mine development \| $	$ 0.7	$ 0.5
Exercise Price Range 28.92 to 36.37
Range of exercise prices and number and weighted average remaining contractual life of stock options
Number of stock options outstanding \| Options			311,550
Weighted average remaining contractual life of outstanding share options	11 months 27 days
Weighted average exercise price of outstanding stock options			$ 36.20
Number of exercisable stock options \| Options			311,550
Weighted average remaining contractual life of exercisable stock options	11 months 27 days
Weighted average exercise price of exercisable stock options			$ 36.20
Exercise Price Range 55.10 to 66.57
Range of exercise prices and number and weighted average remaining contractual life of stock options
Number of stock options outstanding \| Options			3,810,750
Weighted average remaining contractual life of outstanding share options	3 years 2 months 27 days
Weighted average exercise price of outstanding stock options			$ 56.38
Number of exercisable stock options \| Options			884,180
Weighted average remaining contractual life of exercisable stock options	2 years 9 months 11 days
Weighted average exercise price of exercisable stock options			$ 56.74
Exercise Price Range 28.92 to 66.57
Range of exercise prices and number and weighted average remaining contractual life of stock options
Number of stock options outstanding \| Options			4,122,300
Weighted average remaining contractual life of outstanding share options	3 years 26 days
Weighted average exercise price of outstanding stock options			$ 54.86
Number of exercisable stock options \| Options			1,195,730
Weighted average remaining contractual life of exercisable stock options	2 years 3 months 26 days
Weighted average exercise price of exercisable stock options			$ 51.39
Minimum \| Exercise Price Range 28.92 to 36.37
Range of exercise prices and number and weighted average remaining contractual life of stock options
Range of exercise prices			28.92
Minimum \| Exercise Price Range 55.10 to 66.57
Range of exercise prices and number and weighted average remaining contractual life of stock options
Range of exercise prices			55.10
Minimum \| Exercise Price Range 28.92 to 66.57
Range of exercise prices and number and weighted average remaining contractual life of stock options
Range of exercise prices			28.92
Maximum \| Exercise Price Range 28.92 to 36.37
Range of exercise prices and number and weighted average remaining contractual life of stock options
Range of exercise prices			36.37
Maximum \| Exercise Price Range 55.10 to 66.57
Range of exercise prices and number and weighted average remaining contractual life of stock options
Range of exercise prices			66.57
Maximum \| Exercise Price Range 28.92 to 66.57
Range of exercise prices and number and weighted average remaining contractual life of stock options
Range of exercise prices			$ 66.57