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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, 2019
Dec. 31, 2018
Disclosure of benefit plans [line items]    
Defined benefit expense $ 4,790 $ 3,527
Defined contribution pension expense 11,767 13,431
Employee benefit expense 312,561 395,220
Pension plans [member]    
Disclosure of benefit plans [line items]    
Current service cost 1,586 1,670
Interest income or cost 1,545 1,409
Administration cost 1 2
Defined benefit expense 3,132 3,081
Defined contribution pension expense 11,767 13,431
Employee benefit expense 14,899 16,512
Amount of actuarial losses (gains) recognized in other comprehensive income    
Actuarial loss (gain) 7,702 (3,720)
Return on assets excluding interest income (280) 292
Total actuarial losses (gains) recognized in other comprehensive income 7,422 (3,428)
Other Benefit Plans [Member]    
Disclosure of benefit plans [line items]    
Current service cost 817 1,429
Interest income or cost 841 946
Past service cost 0 (1,929)
Administration cost 0 0
Defined benefit expense 1,658 446
Defined contribution pension expense 0 0
Employee benefit expense 1,658 446
Amount of actuarial losses (gains) recognized in other comprehensive income    
Actuarial loss (gain) 2,991 (4,998)
Return on assets excluding interest income 0 0
Total actuarial losses (gains) recognized in other comprehensive income $ 2,991 $ (4,998)