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Summary of significant accounting policies - Treasury Shares (Details)	12 Months Ended
	Dec. 31, 2023 EUR (€)
Corporate information and statement of IFRS compliance [abstract]
Gain (loss) recognized on purchase of treasury shares	€ 0
Gain (loss) recognized on sale of treasury shares	0
Gain (loss) recognized on impairment of treasury shares	0
Gain (loss) recognized on cancellation of treasury shares	€ 0

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Gain (loss) on cancellation of treasury shares.

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Gain (loss) on impairment of treasury shares.

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Gain (loss) on purchase of treasury shares.

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Gain (loss) on sale of treasury shares.

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