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Pension and other post-retirement benefits (Components of net pension and other benefit expense) (Details) - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Disclosure of fair value of plan [line items]    
Defined benefit expense $ 5,656 $ 5,350
Defined contribution pension expense 15,189 12,939
Employee benefit expense 383,300 348,016
Pension Plans [member]    
Disclosure of fair value of plan [line items]    
Current service cost 2,302 2,332
Net interest cost 1,710 1,406
Administration cost 3 4
Defined benefit expense 4,015 3,742
Defined contribution pension expense 15,189 12,939
Employee benefit expense 19,204 16,681
Amount of actuarial losses (gains) recognized in other comprehensive income    
Actuarial gains (19,517) (2,899)
Return on plan assets excluding interest income 555 (172)
Total actuarial losses (gains) recognized in other comprehensive income (18,962) (3,071)
Other Benefit Plans [Member]    
Disclosure of fair value of plan [line items]    
Current service cost 915 956
Net interest cost 726 652
Administration cost 0 0
Defined benefit expense 1,641 1,608
Defined contribution pension expense 0 0
Employee benefit expense 1,641 1,608
Amount of actuarial losses (gains) recognized in other comprehensive income    
Actuarial gains (5,720) (2,100)
Return on plan assets excluding interest income 0 0
Total actuarial losses (gains) recognized in other comprehensive income $ (5,720) $ (2,100)