The amount of cash on hand and demand deposits, along with short-term, highly liquid investments that are readily convertible to known amounts of cash and that are subject to an insignificant risk of changes in value. [Refer: Cash; Cash equivalents]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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CASH AND CASH EQUIVALENTS AND NOTES TO THE CONSOLIDATED STATEMENT OF CASH FLOWS - Cash and Cash Equivalents by Denomination (Details) - EUR (€) € in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Currency [Line Items]
Cash and cash equivalents	€ 1,121,981	€ 1,388,901	€ 1,344,146	€ 1,362,406
Euro
Currency [Line Items]
Cash and cash equivalents	894,509	1,181,354
U.S. Dollar
Currency [Line Items]
Cash and cash equivalents	96,663	70,261
Chinese Yuan
Currency [Line Items]
Cash and cash equivalents	80,716	95,835
Pound Sterling
Currency [Line Items]
Cash and cash equivalents	19,706	9,453
Other currencies
Currency [Line Items]
Cash and cash equivalents	€ 30,387	€ 31,998