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Share-based compensation plans - equity-settled and cash-settled (Details) - CAD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Disclosure of terms and conditions of share-based payment arrangement [line items]
Total compensation expenses under equity settled plans	$ 17,469	$ 18,821
Expenses (recoveries) under its cash-settled plan	(1,437)	3,597
Stock Option Plan [member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Total compensation expenses under equity settled plans	4,418	4,744
Performance Share Unit Plan [member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Total compensation expenses under equity settled plans	7,245	7,690
Restricted Share Unit Plan [member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Total compensation expenses under equity settled plans	2,679	2,542
Employee Share Ownership Plan [member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Total compensation expenses under equity settled plans	3,127	3,845
Deferred Share Unit Plan [member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Expenses (recoveries) under its cash-settled plan	(1,001)	2,922
Phantom Stock Option Plan [member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Expenses (recoveries) under its cash-settled plan	$ (436)	$ 675

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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.

+ Details

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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 2019-01-01
-Paragraph 112
-Subparagraph c
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-URIDate 2019-03-27

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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 2019-01-01
-Paragraph 51
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2019-en-r&anchor=para_51_a&doctype=Standard
-URIDate 2019-03-27

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