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Pension and other post-retirement benefits (Defined benefit plans) (Details) - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Actuarial loss (gain) arising from:    
Administrative costs paid $ 172,029 $ 127,566
Pension Plans [member]    
Disclosure of fair value of plan [line items]    
Current service cost 2,302 2,332
Interest income or cost (1,710) (1,406)
Return on assets excluding interest income 555 (172)
Pension Plans [member] | Plan Assets [Member]    
Disclosure of fair value of plan [line items]    
Fair value of plan assets, beginning of year 5,693 6,217
Interest income or cost 157 144
Return on assets excluding interest income (555) 172
Employer contributions 0 67
Actuarial loss (gain) arising from:    
Benefits paid (890) (903)
Administrative costs paid (3) (4)
Fair value of plan assets, end of year 4,402 5,693
Pension Plans [member] | Defined Benefit Obligations [Member]    
Disclosure of fair value of plan [line items]    
Defined benefit obligation, beginning of year 69,998 72,119
Current service cost 2,302 2,332
Interest income or cost 1,867 1,550
Actuarial loss (gain) arising from:    
- financial assumptions (20,913) (1,996)
- experience adjustment 1,396 (903)
Benefits paid (3,666) (1,741)
Foreign exchange 234 (1,363)
Defined benefit obligation, end of year 51,218 69,998
Defined benefit liability (46,816) (64,305)
Other Benefit Plans [Member]    
Disclosure of fair value of plan [line items]    
Current service cost 915 956
Interest income or cost (726) (652)
Return on assets excluding interest income 0 0
Other Benefit Plans [Member] | Plan Assets [Member]    
Disclosure of fair value of plan [line items]    
Fair value of plan assets, beginning of year 0 0
Interest income or cost 0 0
Return on assets excluding interest income 0 0
Employer contributions 0 0
Actuarial loss (gain) arising from:    
Benefits paid 0 0
Administrative costs paid 0 0
Fair value of plan assets, end of year 0 0
Other Benefit Plans [Member] | Defined Benefit Obligations [Member]    
Disclosure of fair value of plan [line items]    
Defined benefit obligation, beginning of year 24,697 25,827
Current service cost 915 956
Interest income or cost 726 652
Actuarial loss (gain) arising from:    
- financial assumptions (5,881) (1,403)
- experience adjustment 161 (697)
Benefits paid (1,254) (638)
Foreign exchange 0 0
Defined benefit obligation, end of year 19,364 24,697
Defined benefit liability $ (19,364) $ (24,697)