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Share capital and share premium (Details) € / shares in Units, € in Thousands, $ in Millions | 1 Months Ended | 12 Months Ended
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Dec. 31, 2020 EUR (€) € / shares shares | Dec. 31, 2020 USD ($) shares | Dec. 31, 2020 EUR (€) item € / shares shares | Dec. 31, 2019 EUR (€) item € / shares shares | Dec. 31, 2018 EUR (€)
Disclosure of classes of share capital [line items] |  |  |  |  |
Par value per share | € / shares | € 1 |  | € 1 | € 1 |
Share capital | € 179,259 |  | € 179,259 | € 156,816 |
Share premium | 1,205,340 |  | 1,205,340 | 1,018,276 |
Total share capital and share premium | 1,384,599 |  | 1,384,599 | 1,175,092 |
Net proceeds from stock issuance | 10,849 | $ 231.4 | 194,300 |  |
Proceeds from equity offering | € 194,300 | $ 231.4 | 203,006 | 329,161 | € 215,985
Settlement of share-based claims |  |  | (203,006) | (329,172) | (216,021)
Shares issued, transaction costs |  |  | € 553 | € 7,357 |
Shares issued during the period | shares | 15,939,968 | 15,939,968 | 6,502,784 | 156,683,863 |
Ordinary shares [member] |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |
Number of ordinary shares issued | shares | 179,259,246 |  | 179,259,246 | 156,816,494 |
Par value per share | € / shares | € 1 |  | € 1 | € 1.00 |
Share capital | € 179,259 |  | € 179,259 | € 156,816 |
Share premium | 1,205,340 |  | 1,205,340 | 1,018,276 |
Total share capital and share premium | € 1,384,599 |  | € 1,384,599 | € 1,175,092 |
Number of votes per share | item |  |  | 1 | 1 |
Equity attributable to the Equity holders of the Company |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |
Settlement of share-based claims |  |  | € (203,006) | € (329,172) | € (215,985)

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