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Financial risk management (Tables) | 12 Months Ended
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Dec. 31, 2025
Derivative Instruments and Hedging Activities Disclosure [Abstract] |
Schedule of foreign currency sensitivity | The following table details our sensitivity to a 10.0% strengthening of foreign currencies against the euro. The sensitivity analysis includes foreign currency denominated monetary items outstanding and adjusts their translation at the period end for a 10.0% strengthening in foreign currency rates. A positive amount indicates an increase in net income or equity.
Year ended December 31 (€, in millions) | 2024 |  | 2025
| Impact on net income | Impact on equity |  | Impact on net income | Impact on equity
US dollar | 10.3 | 81.3 |  | 1.1 | 88.2
Japanese yen | (30.4) | (0.4) |  | (23.2) | 7.4
Taiwanese dollar | (7.9) | — |  | (2.3) | —
South Korean won | (11.4) | — |  | 21.8 | —
Chinese yuan | 1.7 | — |  | (1.2) | —
Other currencies | (0.8) | — |  | 2.2 | —
Total | (38.5) | 80.9 |  | (1.6) | 95.6
Schedule of notional amounts of outstanding derivative positions | The following table details the notional principal amounts of the outstanding forward foreign exchange contracts.
Year ended December 31 (in billions) | 2024 |  | 2025
US dollar (USD) | 1.0 |  | 1.6
Japanese yen (JPY) | 1.1 |  | 39.7
Taiwanese dollar (TWD) | 27.6 |  | 18.0
South Korean won (KRW) | 66.4 |  | 144.9
Chinese yuan (CNY) | 1.1 |  | 1.1
Schedule of net investment hedges in accumulated other comprehensive income (loss) | The following table details the anticipated outstanding accumulated unrealized gains and losses in OCI from financial instruments for both foreign currency denominated forecasted purchase and sales transactions. All amounts related to the purchase transactions are expected to be released over the next 12 months and will offset the euro equivalent of foreign currency denominated forecasted purchase transactions.
Year ended December 31 (€, in millions) | 2023 | 2024 |  | 2025
Purchase transactions | (8.9) | 25.6 |  | (62.5)
Net of taxes | (7.6) | 21.7 |  | (52.9)
Schedule of interest rate sensitivity | The sensitivity analysis below has been determined based on the exposure to interest rates for both derivative financial and non-derivative financial instruments at the balance sheet date, with the stipulated change taking place at the beginning of the financial year and held constant throughout the reporting period. The table below shows the effect of a 100 basis point increase in interest rates on our net income and equity. A positive amount indicates an increase in net income and equity.
Year ended December 31 (€, in millions) | 2024 |  | 2025
| Impact on net income | Impact on equity |  | Impact on net income | Impact on equity
Effect of a 100 basis point increase in interest rates | 94.9 | — |  | 106.7 | —
Supplier finance program | The amount of the obligations outstanding that we have confirmed as valid to the third party a s of December 31, 2025, was €326.5 million (2024: €344.8 million) and is included in Accounts payable.
Year ended December 31 (€, in millions) | 2024 | 2025
Confirmed obligations outstanding at the beginning of the year | 408.5 | 344.8
Invoices confirmed during the year | 2,851.3 | 2,481.1
Confirmed invoices paid during the year | 2,915.0 | 2,499.4
Confirmed obligations outstanding at the end of the year | 344.8 | 326.5
Summary of notional amounts and estimated fair values of financial instruments | The following table summarizes the notional amounts and estimated fair values of our derivative financial instruments:
Year ended December 31 (€, in millions) | 2024 |  | 2025
| Notional amount | Fair value |  | Notional amount | Fair value
Forward foreign exchange contracts | 240.6 | 44.5 |  | 755.8 | (11.5)
Interest rate swaps | 3,250.0 | (61.6) |  | 2,250.0 | (47.9)
Derivative financial instruments per category | The following table summarizes our derivative financial instruments per category:
Year ended December 31 (€, in millions) | 2024 |  | 2025
| Assets | Liabilities |  | Assets | Liabilities
Interest rate swaps – fair value hedges | 9.3 | 70.9 |  | 0.2 | 48.1
Forward foreign exchange contracts – cash flow hedges | 31.5 | 0.1 |  | 0.9 | 21.6
Forward foreign exchange contracts – no hedge accounting | 55.7 | 42.6 |  | 32.5 | 23.3
Total | 96.5 | 113.6 |  | 33.6 | 93.0
Less non-current portion: |  |  |  |  |
Interest rate swaps – fair value hedges | — | 29.3 |  | — | 19.9
Total non-current portion | — | 29.3 |  | — | 19.9
Total current portion | 96.5 | 84.3 |  | 33.6 | 73.1
Schedule of fair value, assets and liabilities measured on recurring basis | The following tables present our financial assets and financial liabilities that are measured at fair value on a recurring basis and the assets and liabilities for which the fair value is only disclosed:
Year ended December 31, 2025 (€, in millions) | Level 1 | Level 2 | Level 3 |  | Total
Assets measured at fair value |  |  |  |  |
Derivative financial instruments 1 | — | 33.6 | — |  | 33.6
Money market funds 2 | 6,222.2 | — | — |  | 6,222.2
Short-term investments 3 | — | 405.9 | — |  | 405.9
Total | 6,222.2 | 439.5 | — |  | 6,661.7
Liabilities measured at fair value |  |  |  |  |
Derivative financial instruments 1 | — | 93.0 | — |  | 93.0
Assets and liabilities for which fair values are disclosed |  |  |  |  |
Loans receivable | — | — | 1,848.9 |  | 1,848.9
Long-term debt 4 | 3,590.8 | — | — |  | 3,590.8
Year ended December 31, 2024 (€, in millions) | Level 1 | Level 2 | Level 3 |  | Total
Assets measured at fair value |  |  |  |  |
Derivative financial instruments 1 | — | 96.5 | — |  | 96.5
Money market funds 2 | 6,379.2 | — | — |  | 6,379.2
Short-term investments 3 | — | 5.4 | — |  | 5.4
Total | 6,379.2 | 101.9 | — |  | 6,481.1
Liabilities measured at fair value |  |  |  |  |
Derivative financial instruments 1 | — | 113.6 | — |  | 113.6
Assets and liabilities for which fair values are disclosed |  |  |  |  |
Loans receivable | — | — | 1,339.4 |  | 1,339.4
Long-term debt 4 | 4,561.8 | — | — |  | 4,561.8
1.Derivative financial instruments consist of forward foreign exchange contracts and interest rate swaps. 2.Money market funds are part of our cash and cash equivalents. 3.Short-term investments consist of deposits with original maturities to the entity holding the investments longer than three months, but one year or less at the date of acquisition. These deposits are valued at amortized costs which is close to their fair value. Their fair value is determined with reference to quoted market prices in an active market for similar assets or discounted cash flow analysis. 4.Long-term debt mainly relates to Eurobonds.

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- Definition Tabular disclosure of pertinent information about a derivative or group of derivatives on a disaggregated basis, such as for individual instruments, or small groups of similar instruments. May include a combination of the type of instrument, risks being hedged, notional amount, hedge designation, related hedged item, inception date, maturity date, or other relevant item. + References No definition available. + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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