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Pension and other post-retirement benefits - Defined benefit plans (Details) - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Actuarial loss (gain) arising from:    
Administration $ 124,869 $ 141,552
Pension plans [member]    
Disclosure of benefit plans [line items]    
Current service cost 1,586 1,670
Interest income or cost (1,545) (1,409)
Return on assets excluding interest income (280) 292
Pension plans [member] | Plan assets [member]    
Disclosure of benefit plans [line items]    
Fair value of plan assets, beginning of year 7,177 8,061
Interest income or cost 262 259
Return on assets excluding interest income 280 (292)
Employer contributions 0 61
Actuarial loss (gain) arising from:    
Benefits paid (912) (910)
Administration (1) (2)
Fair value of plan assets, end of year 6,806 7,177
Pension plans [member] | Defined benefit obligations [member]    
Disclosure of benefit plans [line items]    
Defined benefit obligation, beginning of year 54,271 55,972
Current service cost 1,586 1,670
Interest income or cost 1,807 1,668
Actuarial loss (gain) arising from:    
- demographic assumptions 0 0
- financial assumptions 6,925 (3,776)
- experience adjustment 777 56
Past service cost 0 0
Benefits paid (1,705) (2,028)
Foreign exchange (1,073) 709
Defined benefit obligation, end of year 62,588 54,271
Defined benefit liability (55,782) (47,094)
Other Benefit Plans [Member]    
Disclosure of benefit plans [line items]    
Current service cost 817 1,429
Interest income or cost (841) (946)
Return on assets excluding interest income 0 0
Actuarial loss (gain) arising from:    
Past service cost 0 (1,929)
Defined benefit liability (24,955) (21,161)
Other Benefit Plans [Member] | Defined benefit obligations [member]    
Disclosure of benefit plans [line items]    
Defined benefit obligation, beginning of year 21,161 26,893
Current service cost 817 1,429
Interest income or cost 841 946
Actuarial loss (gain) arising from:    
- demographic assumptions 0 (192)
- financial assumptions 2,877 (1,887)
- experience adjustment 114 (2,919)
Past service cost 0 (1,929)
Benefits paid (855) (1,180)
Foreign exchange 0 0
Defined benefit obligation, end of year $ 24,955 $ 21,161