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Fair value measurement - Summary of Fair Value Measurement of Equity (Details) - EUR (€) € in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2025 | Dec. 31, 2024
Disclosure of fair value measurement of equity [line items] |  |
At beginning of period | € 982,887 | € 900,896
At end of period | 1,099,081 | 982,887
Level 3 |  |
Disclosure of fair value measurement of equity [line items] |  |
At beginning of period | 59,356 | 57,131
Investments | 5,297 | 2,969
Disposals | (6,831) | (5,617)
Fair value adjustments | 2,994 | 3,598
Realized gains | 155 | 94
Exchange rate (losses)/gains | (2,172) | 1,181
At end of period | € 58,799 | € 59,356

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