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Share-Based Compensation Plan - Additional Information (Details) $ / shares in Units, shares in Thousands, share in Millions | 12 Months Ended
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Dec. 31, 2020 CAD ($) shares share $ / shares | Dec. 31, 2019 CAD ($) shares share $ / shares
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Compensation expense related to share awards | $ 9,469,000 | $ 15,894,000
Cash compensation expense related to share awards | 2,300,000 |
Financial derivatives | $ 26,792,000 | $ 8,668,000
Granted (in shares) | shares | 5,492 | 6,429
Options Outstanding, number outstanding at December 31, 2019 (in shares) | share | 0.3 | 2.5
Options Outstanding, weighted average remaining life | 3 months 18 days |
Options Outstanding, weighted average exercise price (in cad per share) | $ / shares | $ 5.40 | $ 6.83
Incentive Award Plan |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Weighted average fair value of share awards (in cad per share) | $ 1.50 |
Financial derivatives | $ 1,100,000 |
Granted (in shares) | share | 2.9 |
Restricted awards |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Weighted average fair value of share awards (in cad per share) | $ 1.48 | $ 2.63
Granted (in shares) | shares | 2,239 | 3,184

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- Definition The amount of current derivative financial liabilities. [Refer: Derivative financial liabilities] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_55&doctype=Standard -URIDate 2020-01-01 + 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 2020-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_112_c&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The number of other equity instruments (ie other than share options) granted in a share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2020-01-01 -Paragraph 47 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2020-en-r&anchor=para_47_b&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 2 -IssueDate 2020-01-01 -Paragraph 45 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2020-en-r&anchor=para_45&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The weighted average exercise price of share options outstanding in a share-based payment arrangement. [Refer: Weighted average [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2020-01-01 -Paragraph 45 -Subparagraph b -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2020-en-r&anchor=para_45_b_i&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2020-01-01 -Paragraph 45 -Subparagraph b -Clause vi -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2020-en-r&anchor=para_45_b_vi&doctype=Standard -URIDate 2020-01-01 + Details
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