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Segmented information - Geographical segment (Details) - CAD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Disclosure of geographical areas [line items] |  |
Revenue | $ 2,091,661 | $ 2,156,852
Non-current assets, excluding deferred tax assets and financial instruments | 3,947,528 | 4,261,904
Canada [member] |  |
Disclosure of geographical areas [line items] |  |
Revenue | 424,079 | 316,611
Non-current assets, excluding deferred tax assets and financial instruments | 3,401,828 | 3,417,254
Australia [Member] |  |
Disclosure of geographical areas [line items] |  |
Non-current assets, excluding deferred tax assets and financial instruments | 414,084 | 422,400
United States [Member] |  |
Disclosure of geographical areas [line items] |  |
Revenue | 1,660,727 | 1,692,936
Non-current assets, excluding deferred tax assets and financial instruments | 131,526 | 138,455
Kazakhstan [Member] |  |
Disclosure of geographical areas [line items] |  |
Non-current assets, excluding deferred tax assets and financial instruments | 49 | 283,562
Germany [Member] |  |
Disclosure of geographical areas [line items] |  |
Revenue | 2,817 | 147,305
Non-current assets, excluding deferred tax assets and financial instruments | 41 | 233
Switzerland [Member] |  |
Disclosure of geographical areas [line items] |  |
Revenue | $ 4,038 | $ 0

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