Employee benefits - Additional Information (Details) € in Millions	12 Months Ended
Dec. 31, 2023 EUR (€) plan	Dec. 31, 2022 EUR (€)	Dec. 31, 2021 EUR (€)
Employee benefits
Post employment benefit expense, Defined contribution plans \| €	€ 4.9	€ 3.5	€ 3.5
Number of pension plans classified as defined benefit plans \| plan	4

The amount of post-employment benefit expense relating to defined contribution plans. Defined contribution plans are post-employment benefit plans under which an entity pays fixed contributions into a separate entity (a fund) and will have no legal or constructive obligation to pay further contributions if the fund does not hold sufficient assets to pay all employee benefits relating to employee service in the current and prior periods.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 19
-IssueDate 2023-01-01
-Paragraph 53
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2023-en-r&anchor=para_53&doctype=Standard
-URIDate 2023-03-23

Name:	ifrs-full_PostemploymentBenefitExpenseDefinedContributionPlans
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration