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Share based compensation - JSOP 2016 and SOP 2019 narrative (Details) |  | 12 Months Ended
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Apr. 12, 2019 | Dec. 31, 2020 EUR (€) € / shares shares | Dec. 31, 2019 EUR (€) item € / shares shares
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Total share-based payment expense recognized |  | € 21,600,000 |
JSOP 2016 |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Stock options exercised |  | 5,701,996 |
Outstanding vested options | shares |  | 919,733 |
Total share-based payment expense recognized |  | € 3,500,000 | € 28,400,000
SOP 2019 |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Total share-based payment expense recognized |  | € 100,000 |
Number of shares per option | shares |  | 1 | 1
Exercise price, share options granted | € / shares |  | € 1.00 | € 1
Options waiting period |  | 4 years | 4 years
Options exercise period |  | 7 years |
Minimum growth to exercise options (as a percent) |  | 10.00% | 10.00%
Number of tranches | item |  |  | 1
SOP 2019 | Minimum |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Vesting period |  | 3 years | 4 years
SOP 2019 | Maximum |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Vesting period |  | 4 years |
Option forfeiture period |  |  | 6 months
Termination forfeiture period | 4 years |  |

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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- Definition The exercise price of share options granted. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2020-01-01 -Paragraph 47 -Subparagraph a -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2020-en-r&anchor=para_47_a_i&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amount of expense from share-based payment transactions with employees. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_112_c&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The number of share options exercised in a share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2020-01-01 -Paragraph 45 -Subparagraph b -Clause iv -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2020-en-r&anchor=para_45_b_iv&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition. + References No definition available. + Details
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- Definition The number of shares of the entity's stock to be received for each option granted under the share-based compensation plan. + References No definition available. + Details
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- Definition The length of the period, after expiration of the waiting period, during which recipients can exercise options received under the share based compensation plan. + References No definition available. + Details
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- Definition The minimum annual growth in sales volume necessary in order to exercise options granted under the share-based compensation plan. + References No definition available. + Details
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- Definition The period during which former management beneficiaries incept work for a competitor of the entity which triggers forfeiture of unexercised options granted under the share-based compensation plan. + References No definition available. + Details
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- Definition The waiting period that must expire before options granted under the share-based compensation plan can be exercised. + References No definition available. + Details
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