Nature of activities (Narrative) (Details)	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020
Canadian Malartic Mine [Member]
Nature Of Activities [Line Items]
Net smelter return	5.00%
Osisko Development Corp [Member]
Nature Of Activities [Line Items]
Proportion of ownership interest	75.10%	84.10%

The proportion of ownership interest in a subsidiary attributable to the entity. [Refer: Subsidiaries [member]]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Number 27
-IssueDate 2021-01-01
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 27
-IssueDate 2021-01-01
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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Namespace Prefix:	ifrs-full_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration