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Shareholders' Capital (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
CAD ($)
shares
vote
Dec. 31, 2019
CAD ($)
shares
Number of Common Shares    
Vested and converted to common shares (in shares) | shares 2,922,000 4,245,000
Changes in equity [abstract]    
Beginning balance | $ $ 2,947,209 $ 3,055,424
Share-based compensation | $ 7,216 15,894
Ending balance | $ $ 578,213 $ 2,947,209
Shareholders’ capital    
Number of Common Shares    
Beginning balance (in shares) | shares 558,305,000 554,060,000
Vested and converted to common shares (in shares) | shares 2,922,000 4,245,000
Ending balance (in shares) | shares 561,227,000 558,305,000
Changes in equity [abstract]    
Beginning balance | $ $ 5,718,835 $ 5,701,516
Share-based compensation | $ 10,583 17,319
Ending balance | $ $ 5,729,418 $ 5,718,835
Preference shares    
Preferred shares without nominal or par value (in shares) | shares 10,000,000.0  
Issued on corporate acquisition (in shares) | shares 0  
Ordinary shares    
Voting rights, votes per share | vote 1