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Significant accounting policies, estimates and judgements - Currency (Details) | 12 Months Ended |  |  |
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Dec. 31, 2022 € / $ | Dec. 31, 2022 € / $ € / £ | Dec. 31, 2022 € / $ € / $ | Dec. 31, 2021 € / $ | Dec. 31, 2021 € / $ € / £ | Dec. 31, 2021 € / $ € / $ | Dec. 31, 2020 € / $ | Dec. 31, 2020 € / $ € / £ | Dec. 31, 2020 € / $ € / $ | Dec. 31, 2022 € / £ | Dec. 31, 2022 € / $ | Dec. 31, 2021 € / £ | Dec. 31, 2021 € / $ | Dec. 31, 2020 € / £ | Dec. 31, 2020 € / $
Significant accounting policies, estimates and judgements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Annual average exchange rate | 1.05 | 0.85 | 1.52 | 1.18 | 0.86 | 1.57 | 1.14 | 0.89 | 1.66 |  |  |  |  |  |
Exchange rate | 1.07 | 1.07 | 1.07 | 1.13 | 1.13 | 1.13 | 1.23 | 1.23 | 1.23 | 0.89 | 1.57 | 0.84 | 1.56 | 0.9 | 1.59

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- References No definition available. + Details
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- Definition The average exchange rate used by the entity. Exchange rate is the ratio of exchange for two currencies. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2022-03-24 -Paragraph 112 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2022-en-r&anchor=para_112_c&doctype=Standard -URIDate 2022-03-24 + Details
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- Definition The spot exchange rate at the end of the reporting period. Exchange rate is the ratio of exchange for two currencies. Spot exchange rate is the exchange rate for immediate delivery. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2022-03-24 -Paragraph 112 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2022-en-r&anchor=para_112_c&doctype=Standard -URIDate 2022-03-24 + Details
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