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Share-based compensation plans - equity-settled and cash-settled (Details) - CAD ($) $ in Thousands | 12 Months Ended
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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 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 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_112_c&doctype=Standard -URIDate 2019-03-27 + Details
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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 + Details
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- Details
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