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Segmented information - Geographical segment (Details) - CAD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Disclosure of geographical areas [line items]
Revenue	$ 1,862,925	$ 2,091,661
Non-current assets	3,781,082	3,947,528
Canada [member]
Disclosure of geographical areas [line items]
Revenue	567,730	424,079
Non-current assets	3,267,376	3,401,828
Australia [Member]
Disclosure of geographical areas [line items]
Non-current assets	392,500	414,084
United States [Member]
Disclosure of geographical areas [line items]
Revenue	1,295,195	1,660,727
Non-current assets	121,102	131,526
Kazakhstan [Member]
Disclosure of geographical areas [line items]
Non-current assets	80	49
Germany [Member]
Disclosure of geographical areas [line items]
Revenue	0	2,817
Non-current assets	24	41
Switzerland [Member]
Disclosure of geographical areas [line items]
Revenue	$ 0	$ 4,038

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The amount of non-current assets other than financial instruments, deferred tax assets, post-employment benefit assets and rights arising under insurance contracts. [Refer: Deferred tax assets; Financial instruments, class [member]; Non-current assets; Types of insurance contracts [member]]

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Expiry date 2020-01-01: The income arising in the course of an entity's ordinary activities. Income is increases in economic benefits during the accounting period in the form of inflows or enhancements of assets or decreases of liabilities that result in an increase in equity, other than those relating to contributions from equity participants. Effective 2020-01-01: The income arising in the course of an entity's ordinary activities. Income is increases in assets, or decreases in liabilities, that result in increases in equity, other than those relating to contributions from holders of equity claims.

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