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Share-based compensation plans - equity-settled and cash-settled (Details) - CAD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Disclosure of terms and conditions of share-based payment arrangement [line items]
Expenses under equity settled plans	$ 9,738	$ 17,469
Expenses (recoveries) under cash-settled plans	27,241	(1,437)
Stock Option Plan [member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Expenses under equity settled plans	1,011	4,418
Performance Share Unit Plan [member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Expenses under equity settled plans	2,650	7,245
Expenses (recoveries) under cash-settled plans	20,287	0
Restricted Share Unit Plan [member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Expenses under equity settled plans	2,903	2,679
Expenses (recoveries) under cash-settled plans	1,849	0
Employee Share Ownership Plan [member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Expenses under equity settled plans	3,174	3,127
Deferred Share Unit Plan [member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Expenses (recoveries) under cash-settled plans	3,765	(1,001)
Phantom Stock Option Plan [member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Expenses (recoveries) under cash-settled plans	$ 1,340	$ (436)

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- Definition

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.

+ References

No definition available.

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- Definition

The amount of expense arising from cash-settled share-based payment transactions in which the goods or services received did not qualify for recognition as assets. [Refer: Expense from share-based payment transactions in which goods or services received did not qualify for recognition as assets]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2020-01-01
-Paragraph 112
-Subparagraph c
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-URIDate 2020-01-01

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- Definition

The amount of expense arising from equity-settled share-based payment transactions in which the goods or services received did not qualify for recognition as assets. [Refer: Expense from share-based payment transactions in which goods or services received did not qualify for recognition as assets]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 2
-IssueDate 2020-01-01
-Paragraph 51
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2020-en-r&anchor=para_51_a&doctype=Standard
-URIDate 2020-01-01

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