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Share-based compensation - Weighted average assumptions (Details) - SARs and TSARs - $ / shares | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Risk-free interest rate | 0.70% | 0.10%
Expected dividend yield | 1.30% | 0.30%
Expected life of SARs and TSARs (years) | 1 year 8 months 12 days | 1 year 7 months 6 days
Expected volatility | 51.00% | 60.00%
Expected forfeitures | 0.00% | 0.00%
Weighted average fair value (in usd per share) | $ 8.81 | $ 13.36

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- Definition The weighted average exercise price of other equity instruments (ie other than share options) granted in a share-based payment arrangement. [Refer: Weighted average [member]] + References Reference 1: 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 Expected Dividend As Percentage, Other Equity Instruments Granted + References No definition available. + Details
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- Details
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