OTHER LIABILITIES - Components of pension expense (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018
Defined benefit pension plan expense
Current service cost	$ 1,020	$ 975
Administrative expenses	109	109
Interest cost on defined benefit obligation	889	758
Interest on assets	(93)	(79)
Pension expense	$ 1,925	$ 1,763

The amount of pension and other (such as medical, dental and life insurance) postretirement benefit costs recognized during the period for (1) defined benefit plans (periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain (loss) on assets, prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments) and for (2) defined contribution plans (to the extent that a plan's defined contributions to an individual's account are to be made for periods in which that individual renders services, the net cost for a period is the contribution called for in that period; if a plan calls for contributions for periods after an individual retires or terminates, the estimated cost is accrued during the employee's service period).

No definition available.

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