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Financial risks (Narrative) (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Interest rate risk [Member]    
Disclosure of Financial Risks [Line Items]    
Sensitivity analysis, variance, percentage 1.00%  
Effect of variance on net financial expenses $ 1.9 $ 1.5
Foreign exchange risk [Member]    
Disclosure of Financial Risks [Line Items]    
Sensitivity analysis, variance, percentage 5.00%  
Effect of variance on net earnings $ 7.0 1.4
Other price risk [Member]    
Disclosure of Financial Risks [Line Items]    
Sensitivity analysis, variance, percentage 10.00%  
Effect of variance on other comprehensive income $ 1.6 1.6
Credit risk [Member]    
Disclosure of Financial Risks [Line Items]    
Expected credit loss $ 43.8 $ 13.9