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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 |

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