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Share-based payments - Outstanding DSUs Activity (Details) - Deferred Stock Units (DSU)	12 Months Ended
	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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Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

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The number of other equity instruments (ie other than share options) granted in a share-based payment arrangement.

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The weighted average fair value at the measurement date of granted equity instruments other than share options. [Refer: Weighted average [member]]

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