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Capital management (Capital management) (Details) - CAD ($)
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of objectives policies and processes for managing capital abstract      
Long-term debt $ 997,000,000 $ 996,250,000  
Cash and cash equivalents (1,143,674,000) (1,247,447,000) $ (918,382,000)
Short-term investments (1,138,174,000) (84,906,000)  
Net debt (1,284,848,000) (336,103,000)  
Non-controlling interest 11,000 127,000  
Shareholders' equity 5,836,054,000 4,845,841,000  
Total equity 5,836,065,000 4,845,968,000 $ 4,958,561,000
Total capital $ 4,551,217,000 $ 4,509,865,000