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Cash and cash equivalents and short-term investments - Short-Term Investments (Details) - EUR (€) € in Millions	Dec. 31, 2025	Dec. 31, 2024
Short Term Investments [Line Items]
Cash and cash equivalents	€ 12,916.0	€ 12,735.9
Short-term investments	405.9	5.4
Deposits with financial institutions, governments and government-related bodies
Short Term Investments [Line Items]
Cash and cash equivalents	5,558.5	4,850.4
Bank accounts
Short Term Investments [Line Items]
Cash and cash equivalents	€ 1,135.3	1,506.3
Fair value, recurring
Short Term Investments [Line Items]
Investments in money market funds		€ 6,379.2

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Amount of cash and cash equivalent. Cash includes, but is not limited to, currency on hand, demand deposit with financial institution, and account with general characteristic of demand deposit. Cash equivalent includes, but is not limited to, short-term, highly liquid investment that is both readily convertible to known amount of cash and so near maturity that it presents insignificant risk of change in value because of change in interest rate.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 210
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-Name Accounting Standards Codification
-Section S99
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-Topic 210
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-Section 45
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-Section 45
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-Publisher FASB
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Investment in short-term money-market instruments (such as commercial paper, banker's acceptances, repurchase agreements, government securities, certificates of deposit, and so forth) which are highly liquid (that is, readily convertible to known amounts of cash) and so near their maturity that they present an insignificant risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify as cash equivalents by definition. Original maturity means an original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months.

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