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Staff expenses - Summary of changes in share awards (Details) - Share awards | 12 Months Ended
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Dec. 31, 2024 shares € / shares | Dec. 31, 2023 shares € / shares | Dec. 31, 2022 shares € / shares
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Options outstanding, Opening balance (in shares) | shares | 3,897,800 | 3,699,555 | 3,674,672
Share awards granted (in shares) | shares | 4,429,394 | 3,469,747 | 3,107,083
Share awards, Vested (in shares) | shares | (3,343,429) | (3,113,115) | (2,962,698)
Share awards, Forfeited (in shares) | shares | (128,223) | (158,387) | (119,502)
Options outstanding, Closing balance (in shares) | shares | 4,855,542 | 3,897,800 | 3,699,555
Weighted average grant date fair value, Opening balance (in eur per share) | € / shares | € 8.81 | € 7.97 | € 7.60
Weighted average grant date fair values, Granted (in eur per share) | € / shares | 13.75 | 9.71 | 8.99
Weighted average grant date fair value, Vested (in eur per share) | € / shares | 12.29 | 8.83 | 8.60
Weighted average grant date fair value, Forfeited (in eur per share) | € / shares | 10.73 | 8.54 | 7.63
Weighted average grant date fair value, Closing balance (in eur per share) | € / shares | € 10.88 | € 8.81 | € 7.97

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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 2024-01-01 -Paragraph 45 -Subparagraph b -Clause iv -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2024-en-r&anchor=para_45_b_iv&doctype=Standard -URIDate 2024-03-27 + Details
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