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Capital Stock and Long-term Retention Plan - Weighted-average assumptions (Details) - LTRP - EquityInstruments EquityInstruments in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Assumptions: |  |  |  |  |
Dividend yield | 0.94% | 1.38% | 0.82% | 0.55% | 0.38%
Expected volatility | 43.74% | 35.13% | 30.47% | 25.38% | 24.58%
Risk-free interest rate | 5.51% | 5.74% | 6.88% | 7.17% | 7.04%
Expected average life of awards | 3 years | 3 years | 2 years 8 months 1 day | 3 years | 2 years 11 months 16 days
CPOs |  |  |  |  |
Arrangements: |  |  |  |  |
Number of CPOs or CPOs equivalent granted (in units) | 38,800 | 39,200 | 72,558 | 32,500 | 37,000
Contractual life | 3 years | 3 years | 2 years 8 months 1 day | 3 years | 3 years

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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 2021-01-01 -Paragraph 47 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2021-en-r&anchor=para_47_b&doctype=Standard -URIDate 2021-03-24 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 2 -IssueDate 2021-01-01 -Paragraph 45 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2021-en-r&anchor=para_45&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition The expected average award life of the other equity instruments. + References No definition available. + Details
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- Definition The percentage of an expected dividend used to calculate the fair value of other equity instruments granted. + References No definition available. + Details
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- Definition The expected volatility of the share price used to calculate the fair value of the other equity instruments granted. Expected volatility is a measure of the amount by which a price is expected to fluctuate during a period. + References No definition available. + Details
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- Definition Period from grant date that an equity-based award expires, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition The implied yield currently available on zero-coupon government issues of the country in whose currency the exercise price for other equity instruments granted is expressed, with a remaining term equal to the expected term of the award being valued (based on the award's remaining contractual life and taking into account the effects of expected early exercise). + References No definition available. + Details
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- References No definition available. + Details
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- References No definition available. + Details
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- Details
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- Details
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