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Share-based compensation - Weighted average assumptions (Details) - SARs and TSARs | 12 Months Ended
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Dec. 31, 2020 USD ($) year | Dec. 31, 2019 USD ($) year
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Risk-free interest rate | 0.10% | 1.60%
Expected dividend yield | 0.30% | 3.70%
Expected life of SARs and TSARs (years) | year | 1.6 | 1.2
Expected volatility | 60.00% | 38.00%
Expected forfeitures | 0.00% | 0.10%
Weighted average fair value (USD per share) | $ | $ 13.36 | $ 3.03

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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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- Details
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