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Financial risks (Narrative) (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Interest rate risk [Member]    
Disclosure of Financial Risks [Line Items]    
Sensitivity analysis, variance, percentage 0.50%  
Foreign exchange risk [Member]    
Disclosure of Financial Risks [Line Items]    
Sensitivity analysis, variance, percentage 5.00%  
Effect of variance on net earnings $ 1.8 $ 1.2
Other price risk [Member]    
Disclosure of Financial Risks [Line Items]    
Sensitivity analysis, variance, percentage 10.00%  
Effect of variance on net earnings $ 2.5 1.7
Effect of variance on other comprehensive income 8.2 10.0
Credit risk [Member]    
Disclosure of Financial Risks [Line Items]    
Expected credit loss $ 14.2 $ 12.7