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Share capital - Narrative (Details)
$ in Millions
 2 Months Ended
Dec. 31, 2020
CAD ($)
vote
shares
Nov. 04, 2020
Dec. 31, 2019
shares
Maximum      
Disclosure of classes of share capital [line items]      
Percentage of public float   10.00%  
Percentage of public float   10.00%  
Preferred shares      
Disclosure of classes of share capital [line items]      
Shares repurchased and canceled 41,400    
Value of shares repurchased and canceled | $ $ 1    
Special circumstance vote per share | vote 1    
Share conversion ratio 1    
Number of shares outstanding (in shares) 160,258,600    
Class B | Issued capital      
Disclosure of classes of share capital [line items]      
Number of shares outstanding (in shares) 0   0