Financial risk management - Aging of Debtors (Details)	12 Months Ended
Dec. 31, 2024 EUR (€) item	Dec. 31, 2023 EUR (€)	Dec. 31, 2022 EUR (€)
Financial risk management
Financial assets	€ 3,494,788,000	€ 3,721,421,000	€ 4,128,033,000
Number Of Uncollectable Invoices \| item	2
Trade receivables \| Accumulated impairment [member]
Financial risk management
Financial assets	€ (9,600,000)
60 - 90 days \| Trade receivables \| Credit risk
Financial risk management
Financial assets	552,000	3,000	424,000
90 - 120 days \| Trade receivables \| Credit risk
Financial risk management
Financial assets	24,000	3,000	208,000
more than 120 days \| Trade receivables \| Credit risk
Financial risk management
Financial assets	€ 19,000	€ 117,000	€ 473,000

- Definition

The amount of assets that are: (a) cash; (b) an equity instrument of another entity; (c) a contractual right: (i) to receive cash or another financial asset from another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially favourable to the entity; or (d) a contract that will, or may be, settled in the entity’s own equity instruments and is: (i) a non-derivative for which the entity is, or may be, obliged to receive a variable number of the entity’s own equity instruments; or (ii) a derivative that will, or may be, settled other than by the exchange of a fixed amount of cash or another financial asset for a fixed number of the entity’s own equity instruments. For this purpose the entity’s own equity instruments do not include puttable financial instruments classified as equity instruments in accordance with paragraphs 16A-16B of IAS 32, instruments that impose on the entity an obligation to deliver to another party a pro rata share of the net assets of the entity only on liquidation and are classified as equity instruments in accordance with paragraphs 16C-16D of IAS 32, or instruments that are contracts for the future receipt or delivery of the entity’s own equity instruments. [Refer: Classes of financial instruments [domain]; Financial liabilities]

+ References+ Details