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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
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-URIDate 2020-01-01

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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
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-URIDate 2020-01-01

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