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Significant accounting policies, estimates and judgements (Tables) | 12 Months Ended
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Dec. 31, 2021
Significant accounting policies, estimates and judgements |
Schedule of foreign exchange rates used to translate the financial statements into Parent's functional currency | The main foreign exchange rates used to translate the financial statements into the parent’s functional currency are indicated below: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Annual average | ​ | Exchange rate at | ​ | Annual average | ​ | Exchange rate at | ​ | Annual average | ​ | Exchange rate at
​ | ​ | exchange rate | ​ | December 31, | ​ | exchange rate | ​ | December 31, | ​ | exchange rate | ​ | December 31,
(currency amount for 1 €) | ​ | 2021 | ​ | 2021 | ​ | 2020 | ​ | 2020 | ​ | 2019 | ​ | 2019
U.S. Dollar |  | 1.18 |  | 1.13 |  | 1.14 |  | 1.23 |  | 1.12 |  | 1.12
Pound Sterling |  | 0.86 |  | 0.84 |  | 0.89 |  | 0.90 |  | 0.88 |  | 0.85
Australian Dollar |  | 1.57 |  | 1.56 |  | 1.66 |  | 1.59 |  | 1.61 |  | 1.60

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