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Financial risks (Narrative) (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Interest rate risk [Member]    
Disclosure Of Financial Risks [Line Items]    
Sensitivity analysis, variance, percentage 0.50% 0.50%
Currency risk [Member]    
Disclosure Of Financial Risks [Line Items]    
Sensitivity analysis, variance, percentage 5.00% 5.00%
Effect of variance on net earnings $ 1.3 $ 2.1
Market risk [Member]    
Disclosure Of Financial Risks [Line Items]    
Sensitivity analysis, variance, percentage 10.00% 10.00%
Effect of variance on net earnings $ 0.4 $ 0.5
Effect of variance on other comprehensive income $ 5.7 $ 9.0