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Share-based compensation plans (Equity-settled and cash-settled) (Details) - CAD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Disclosure of terms and conditions of share-based payment arrangement [line items]
Expenses under equity settled plans	$ 6,859,000	$ 7,837,000
Expenses (recoveries) under cash-settled plans	24,369,000	41,839,000
Stock Option Plan [member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Expenses under equity settled plans	45,000	366,000
Performance Share Unit Plan [member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Expenses under equity settled plans	0	1,237,000
Expenses (recoveries) under cash-settled plans	11,221,000	25,784,000
Restricted Share Unit Plan [member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Expenses under equity settled plans	3,273,000	2,933,000
Expenses (recoveries) under cash-settled plans	9,342,000	6,890,000
Employee Share Ownership Plan [member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Expenses under equity settled plans	3,541,000	3,301,000
Deferred Share Unit Plan [member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Expenses (recoveries) under cash-settled plans	2,811,000	6,741,000
Phantom Stock Option Plan [member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Expenses (recoveries) under cash-settled plans	751,000	2,261,000
Phantom Restricted Share Unit Plan [Member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Expenses (recoveries) under cash-settled plans	$ 244,000	$ 163,000

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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with 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]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2021-01-01
-Paragraph 112
-Subparagraph c
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-URIDate 2021-03-24

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X

- 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]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 2
-IssueDate 2021-01-01
-Paragraph 51
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2021-en-r&anchor=para_51_a&doctype=Standard
-URIDate 2021-03-24

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