Cash and cash equivalents (Details) - EUR (€) € in Thousands	Dec. 31, 2025	Dec. 31, 2024
Cash and cash equivalents
Cash	€ 929,692	€ 837,328
Securities and time deposits	669,421	342,859
Cash and cash equivalents	1,599,113	1,180,187
Restricted cash	€ 16,595	€ 29,240

The amount of cash on hand and demand deposits. [Refer: Cash on hand]

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition

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]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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No definition available.

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The amount of 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.

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- Definition

The amount of cash and cash equivalents whose use or withdrawal is restricted. [Refer: Cash and cash equivalents]

+ References

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