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Share-based payments - Outstanding DSUs Activity (Details) - Deferred Stock Units (DSU) | 12 Months Ended
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Dec. 31, 2020 CAD ($) shares | Dec. 31, 2019 CAD ($) shares
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Beginning balance, outstanding (in shares) | 4,623,099 | 4,391,997
Issued (in shares) | 77,042 | 84,588
Settlement of RSUs/PSUs (in shares) | 90,435 | 146,960
Dividends credited (in shares) | 255,960 | 236,079
Settled (in shares) | (815,864) | (236,525)
Ending balance, outstanding (in shares) | 4,230,672 | 4,623,099
Weighted average fair value at measurement date, other equity instruments granted | $ | $ 61 | $ 59

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