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Staff expenses - Summary of changes in share awards (Details) - Share awards	12 Months Ended
	Dec. 31, 2023 shares € / shares	Dec. 31, 2022 shares € / shares	Dec. 31, 2021 shares € / shares
Disclosure of terms and conditions of share-based payment arrangement [line items]
Options outstanding, Opening balance (in shares) | shares	3,699,555	3,674,672	3,878,219
Share awards granted (in shares) | shares	3,469,747	3,107,083	3,391,122
Share awards, Vested (in shares) | shares	(3,113,115)	(2,962,698)	(3,459,163)
Share awards, Forfeited (in shares) | shares	(158,387)	(119,502)	(135,506)
Options outstanding, Closing balance (in shares) | shares	3,897,800	3,699,555	3,674,672
Weighted average grant date fair value, Opening balance (in eur per share) | € / shares	€ 7.97	€ 7.60	€ 7.25
Weighted average grant date fair values, Granted (in eur per share) | € / shares	9.71	8.99	9.69
Weighted average grant date fair value, Vested (in eur per share) | € / shares	8.83	8.60	9.25
Weighted average grant date fair value, Forfeited (in eur per share) | € / shares	8.54	7.63	7.61
Weighted average grant date fair value, Closing balance (in eur per share) | € / shares	€ 8.81	€ 7.97	€ 7.60

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