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Pension and other post-retirement benefits - percentages of the total fair value of assets (Details) - Pension plans [member] - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure of benefit plans [line items]    
The percentages of the total fair value of assets [1] 100.00% 100.00%
Description of the refundable tax account held by CRA equal to half of the sum of the realized investment income plus employer contributions less half of the benefits paid by the plan  
Related Parties [member]    
Disclosure of benefit plans [line items]    
Defined benefit plan assets $ 0 $ 0
Canadian Equity Securities [member]    
Disclosure of benefit plans [line items]    
The percentages of the total fair value of assets 9.00% 9.00%
US equity securities [Member]    
Disclosure of benefit plans [line items]    
The percentages of the total fair value of assets 12.00% 0.00%
Global Equity Securities [member]    
Disclosure of benefit plans [line items]    
The percentages of the total fair value of assets 9.00% 21.00%
Canadian Fixed Income [member]    
Disclosure of benefit plans [line items]    
The percentages of the total fair value of assets 30.00% 29.00%
Other [member]    
Disclosure of benefit plans [line items]    
The percentages of the total fair value of assets [2] 40.00% 41.00%
[1]

The defined benefit plan assets contain no material amounts of related p arty assets at December 31, 2019 and 2018 respectively.

[2]

Relates to the value of the refundable tax account held by the Canada Revenue Agency. The refundable total is approximately equal to half of the sum of the realized investment income plus employer contributions less half of the benefits paid by the plan .