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Fair value of financial instruments - Fair value measurement sensitivity to unobservable inputs (Details) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019
Volatility | Minimum |  |
Disclosure of Fair value of financial instruments [Line Items] |  |
A significant increase would result in a lower fair value | 3.128% |
Volatility | Maximum |  |
Disclosure of Fair value of financial instruments [Line Items] |  |
A significant increase would result in a lower fair value | 8.89% |
Level 3 |  |
Disclosure of Fair value of financial instruments [Line Items] |  |
Description of sensitivity of fair value measurement to changes in unobservable inputs, assets | A significant increase in volatility would result in a lower fair value |
Level 3 | Volatility | Minimum |  |
Disclosure of Fair value of financial instruments [Line Items] |  |
A significant increase would result in a lower fair value | 10.00% | 12.97%
Level 3 | Volatility | Maximum |  |
Disclosure of Fair value of financial instruments [Line Items] |  |
A significant increase would result in a lower fair value | 20.00% | 27.50%

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- Definition The description of the sensitivity of the fair value measurement of assets to changes in unobservable inputs if a change to those inputs might result in a higher or lower fair value measurement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 13 -IssueDate 2020-01-01 -Paragraph 93 -Subparagraph h -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2020-en-r&anchor=para_93_h_i&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The percentage of a reasonably possible increase in an unobservable input used in fair value measurement of assets. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 13 -IssueDate 2020-01-01 -Paragraph 93 -Subparagraph h -Clause ii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2020-en-r&anchor=para_93_h_ii&doctype=Standard -URIDate 2020-01-01 + Details
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