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Share-based payments - Outstanding RSUs/PSUs Activity (Details) - RSUs/PSUs	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)	2,915,118	2,812,697
Granted (in shares)	866,127	975,348
Dividends credited (in shares)	165,435	149,648
Settled (in shares)	(935,117)	(932,133)
Forfeited (in shares)	(38,170)	(90,442)
Ending balance, outstanding (in shares)	2,973,393	2,915,118
Vested (in shares)	1,065,454	904,266
Weighted average fair value at measurement date, other equity instruments granted | $	$ 63	$ 58

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Number Of Other Equity Instruments Settled In Share-Based Payment Arrangement

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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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- Definition

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

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-IssueDate 2020-01-01
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The number of other equity instruments (ie other than share options) outstanding 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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