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Shareholders' equity - Restricted stock unit (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 USD ($) EquityInstruments | Dec. 31, 2019 USD ($) EquityInstruments
Restricted Share Units |  |
Stock-based payments |  |
Fair value of RSUs granted | $ 5.0 | $ 3.9
Number of trading days immediately preceding the date of conversion or award grant for determining fair value | 5 days |
Stock-based compensation expenses | $ 3.4 | 2.6
Capitalised to royalty, stream and working interest | 0.1 | 0.6
Total unrecognized non-cash stock-based compensation expense | $ 7.7 | $ 6.4
Expected to be recognized over weighted average period | 2 years 1 month 6 days | 2 years 1 month 6 days
Performance based RSU |  |
Stock-based payments |  |
Granted | EquityInstruments | 22,519 | 20,153
Time-based RSU |  |
Stock-based payments |  |
Granted | EquityInstruments | 14,546 | 19,863

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- Definition The amount of unrecognized expense arising from share-based payment transactions in which the goods or services received did not qualify for recognition as assets. + References No definition available. + 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 fair value at the measurement date of granted equity instruments other than share options. [Refer: Weighted average [member]] + 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 + Details
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