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Fair value measurement - Summary of Financial Assets (Details) - EUR (€) € in Thousands | Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | --- | ---
Disclosure of financial assets [line items] |  |  |
Financial assets | € 570,191 | € 588,386 |
Other current financial assets | 77,432 | 77,269 |
Level 1 |  |  |
Disclosure of financial assets [line items] |  |  |
Financial assets | 10,309 | 15,428 |
Other current financial assets | 10,309 | 15,428 |
Level 2 |  |  |
Disclosure of financial assets [line items] |  |  |
Financial assets | 501,083 | 513,602 |
Other current financial assets | 12,747 | 7,775 |
Level 3 |  |  |
Disclosure of financial assets [line items] |  |  |
Financial assets | 58,799 | 59,356 |
Other current financial assets | 54,376 | 54,066 |
FVPL |  |  |
Disclosure of financial assets [line items] |  |  |
Financial assets | 73,521 | 67,295 |
Other current financial assets | 68,635 | 61,415 | € 56,880
FVOCI |  |  |
Disclosure of financial assets [line items] |  |  |
Financial assets | 14,102 | 13,935 |
Other current financial assets | 7,047 | 12,224 | 28,440
Amortized cost |  |  |
Disclosure of financial assets [line items] |  |  |
Financial assets | 482,568 | 507,156 |
Other current financial assets | 1,750 | 3,630 |
Derivative financial instruments |  |  |
Disclosure of financial assets [line items] |  |  |
Financial assets | 7,055 | 1,711 |
Derivative financial instruments | Level 1 |  |  |
Disclosure of financial assets [line items] |  |  |
Financial assets | 0 | 0 |
Derivative financial instruments | Level 2 |  |  |
Disclosure of financial assets [line items] |  |  |
Financial assets | 7,055 | 1,711 |
Derivative financial instruments | Level 3 |  |  |
Disclosure of financial assets [line items] |  |  |
Financial assets | 0 | 0 |
Derivative financial instruments | FVPL |  |  |
Disclosure of financial assets [line items] |  |  |
Financial assets | 0 | 0 |
Derivative financial instruments | FVOCI |  |  |
Disclosure of financial assets [line items] |  |  |
Financial assets | 7,055 | 1,711 |
Derivative financial instruments | Amortized cost |  |  |
Disclosure of financial assets [line items] |  |  |
Financial assets | 0 | 0 |
Cash and cash equivalents |  |  |
Disclosure of financial assets [line items] |  |  |
Financial assets | 220,121 | 219,130 |
Cash and cash equivalents | Level 1 |  |  |
Disclosure of financial assets [line items] |  |  |
Financial assets | 0 | 0 |
Cash and cash equivalents | Level 2 |  |  |
Disclosure of financial assets [line items] |  |  |
Financial assets | 220,121 | 219,130 |
Cash and cash equivalents | Level 3 |  |  |
Disclosure of financial assets [line items] |  |  |
Financial assets | 0 | 0 |
Cash and cash equivalents | FVPL |  |  |
Disclosure of financial assets [line items] |  |  |
Financial assets | 0 | 0 |
Cash and cash equivalents | FVOCI |  |  |
Disclosure of financial assets [line items] |  |  |
Financial assets | 0 | 0 |
Cash and cash equivalents | Amortized cost |  |  |
Disclosure of financial assets [line items] |  |  |
Financial assets | 220,121 | 219,130 |
Trade receivables |  |  |
Disclosure of financial assets [line items] |  |  |
Financial assets | 227,087 | 248,790 |
Trade receivables | Level 1 |  |  |
Disclosure of financial assets [line items] |  |  |
Financial assets | 0 | 0 |
Trade receivables | Level 2 |  |  |
Disclosure of financial assets [line items] |  |  |
Financial assets | 227,087 | 248,790 |
Trade receivables | Level 3 |  |  |
Disclosure of financial assets [line items] |  |  |
Financial assets | 0 | 0 |
Trade receivables | FVPL |  |  |
Disclosure of financial assets [line items] |  |  |
Financial assets | 0 | 0 |
Trade receivables | FVOCI |  |  |
Disclosure of financial assets [line items] |  |  |
Financial assets | 0 | 0 |
Trade receivables | Amortized cost |  |  |
Disclosure of financial assets [line items] |  |  |
Financial assets | 227,087 | 248,790 |
Other non-current financial assets |  |  |
Disclosure of financial assets [line items] |  |  |
Financial assets | 38,496 | 41,486 |
Other non-current financial assets | Level 1 |  |  |
Disclosure of financial assets [line items] |  |  |
Financial assets | 0 | 0 |
Other non-current financial assets | Level 2 |  |  |
Disclosure of financial assets [line items] |  |  |
Financial assets | 34,073 | 36,196 |
Other non-current financial assets | Level 3 |  |  |
Disclosure of financial assets [line items] |  |  |
Financial assets | 4,423 | 5,290 |
Other non-current financial assets | FVPL |  |  |
Disclosure of financial assets [line items] |  |  |
Financial assets | 4,886 | 5,880 |
Other non-current financial assets | FVOCI |  |  |
Disclosure of financial assets [line items] |  |  |
Financial assets | 0 | 0 |
Other non-current financial assets | Amortized cost |  |  |
Disclosure of financial assets [line items] |  |  |
Financial assets | 33,610 | 35,606 |
Other current financial assets |  |  |
Disclosure of financial assets [line items] |  |  |
Financial assets | 77,432 | 77,269 |
Other current financial assets | Level 1 |  |  |
Disclosure of financial assets [line items] |  |  |
Financial assets | 10,309 | 15,428 |
Other current financial assets | Level 2 |  |  |
Disclosure of financial assets [line items] |  |  |
Financial assets | 12,747 | 7,775 |
Other current financial assets | Level 3 |  |  |
Disclosure of financial assets [line items] |  |  |
Financial assets | 54,376 | 54,066 |
Other current financial assets | FVPL |  |  |
Disclosure of financial assets [line items] |  |  |
Financial assets | 68,635 | 61,415 |
Other current financial assets | FVOCI |  |  |
Disclosure of financial assets [line items] |  |  |
Financial assets | 7,047 | 12,224 |
Other current financial assets | Amortized cost |  |  |
Disclosure of financial assets [line items] |  |  |
Financial assets | 1,750 | 3,630 |
Private equity |  |  |
Disclosure of financial assets [line items] |  |  |
Other current financial assets | 21,565 | 23,954 |
Private equity | Level 1 |  |  |
Disclosure of financial assets [line items] |  |  |
Other current financial assets | 0 | 0 |
Private equity | Level 2 |  |  |
Disclosure of financial assets [line items] |  |  |
Other current financial assets | 0 | 0 |
Private equity | Level 3 |  |  |
Disclosure of financial assets [line items] |  |  |
Other current financial assets | 21,565 | 23,954 |
Private equity | FVPL |  |  |
Disclosure of financial assets [line items] |  |  |
Other current financial assets | 21,565 | 23,954 | 22,399
Private equity | FVOCI |  |  |
Disclosure of financial assets [line items] |  |  |
Other current financial assets | 0 | 0 |
Private equity | Amortized cost |  |  |
Disclosure of financial assets [line items] |  |  |
Other current financial assets | 0 | 0 |
Private debt |  |  |
Disclosure of financial assets [line items] |  |  |
Other current financial assets | 11,720 | 10,395 |
Private debt | Level 1 |  |  |
Disclosure of financial assets [line items] |  |  |
Other current financial assets | 0 | 0 |
Private debt | Level 2 |  |  |
Disclosure of financial assets [line items] |  |  |
Other current financial assets | 284 | 281 |
Private debt | Level 3 |  |  |
Disclosure of financial assets [line items] |  |  |
Other current financial assets | 11,436 | 10,114 |
Private debt | FVPL |  |  |
Disclosure of financial assets [line items] |  |  |
Other current financial assets | 11,720 | 10,395 | 10,106
Private debt | FVOCI |  |  |
Disclosure of financial assets [line items] |  |  |
Other current financial assets | 0 | 0 |
Private debt | Amortized cost |  |  |
Disclosure of financial assets [line items] |  |  |
Other current financial assets | 0 | 0 |
Hedge funds |  |  |
Disclosure of financial assets [line items] |  |  |
Other current financial assets | 11,370 | 10,285 |
Hedge funds | Level 1 |  |  |
Disclosure of financial assets [line items] |  |  |
Other current financial assets | 0 | 0 |
Hedge funds | Level 2 |  |  |
Disclosure of financial assets [line items] |  |  |
Other current financial assets | 0 | 0 |
Hedge funds | Level 3 |  |  |
Disclosure of financial assets [line items] |  |  |
Other current financial assets | 11,370 | 10,285 |
Hedge funds | FVPL |  |  |
Disclosure of financial assets [line items] |  |  |
Other current financial assets | 11,370 | 10,285 | 8,995
Hedge funds | FVOCI |  |  |
Disclosure of financial assets [line items] |  |  |
Other current financial assets | 0 | 0 |
Hedge funds | Amortized cost |  |  |
Disclosure of financial assets [line items] |  |  |
Other current financial assets | 0 | 0 |
Real estate funds |  |  |
Disclosure of financial assets [line items] |  |  |
Other current financial assets | 10,005 | 9,713 |
Real estate funds | Level 1 |  |  |
Disclosure of financial assets [line items] |  |  |
Other current financial assets | 0 | 0 |
Real estate funds | Level 2 |  |  |
Disclosure of financial assets [line items] |  |  |
Other current financial assets | 0 | 0 |
Real estate funds | Level 3 |  |  |
Disclosure of financial assets [line items] |  |  |
Other current financial assets | 10,005 | 9,713 |
Real estate funds | FVPL |  |  |
Disclosure of financial assets [line items] |  |  |
Other current financial assets | 10,005 | 9,713 |
Real estate funds | FVOCI |  |  |
Disclosure of financial assets [line items] |  |  |
Other current financial assets | 0 | 0 |
Real estate funds | Amortized cost |  |  |
Disclosure of financial assets [line items] |  |  |
Other current financial assets | 0 | 0 |
Money market funds and floating income |  |  |
Disclosure of financial assets [line items] |  |  |
Other current financial assets | 13,864 | 9,649 |
Money market funds and floating income | Level 1 |  |  |
Disclosure of financial assets [line items] |  |  |
Other current financial assets | 3,151 | 5,785 |
Money market funds and floating income | Level 2 |  |  |
Disclosure of financial assets [line items] |  |  |
Other current financial assets | 10,713 | 3,864 |
Money market funds and floating income | Level 3 |  |  |
Disclosure of financial assets [line items] |  |  |
Other current financial assets | 0 | 0 |
Money market funds and floating income | FVPL |  |  |
Disclosure of financial assets [line items] |  |  |
Other current financial assets | 10,713 | 3,864 |
Money market funds and floating income | FVOCI |  |  |
Disclosure of financial assets [line items] |  |  |
Other current financial assets | 3,151 | 5,785 |
Money market funds and floating income | Amortized cost |  |  |
Disclosure of financial assets [line items] |  |  |
Other current financial assets | 0 | 0 |
Fixed income |  |  |
Disclosure of financial assets [line items] |  |  |
Other current financial assets | 3,896 | 6,439 |
Fixed income | Level 1 |  |  |
Disclosure of financial assets [line items] |  |  |
Other current financial assets | 3,896 | 6,439 |
Fixed income | Level 2 |  |  |
Disclosure of financial assets [line items] |  |  |
Other current financial assets | 0 | 0 |
Fixed income | Level 3 |  |  |
Disclosure of financial assets [line items] |  |  |
Other current financial assets | 0 | 0 |
Fixed income | FVPL |  |  |
Disclosure of financial assets [line items] |  |  |
Other current financial assets | 0 | 0 |
Fixed income | FVOCI |  |  |
Disclosure of financial assets [line items] |  |  |
Other current financial assets | 3,896 | 6,439 | 11,748
Fixed income | Amortized cost |  |  |
Disclosure of financial assets [line items] |  |  |
Other current financial assets | 0 | 0 |
Guarantee deposits |  |  |
Disclosure of financial assets [line items] |  |  |
Other current financial assets | 1,492 | 3,360 |
Guarantee deposits | Level 1 |  |  |
Disclosure of financial assets [line items] |  |  |
Other current financial assets | 0 | 0 |
Guarantee deposits | Level 2 |  |  |
Disclosure of financial assets [line items] |  |  |
Other current financial assets | 1,492 | 3,360 |
Guarantee deposits | Level 3 |  |  |
Disclosure of financial assets [line items] |  |  |
Other current financial assets | 0 | 0 |
Guarantee deposits | FVPL |  |  |
Disclosure of financial assets [line items] |  |  |
Other current financial assets | 0 | 0 |
Guarantee deposits | FVOCI |  |  |
Disclosure of financial assets [line items] |  |  |
Other current financial assets | 0 | 0 |
Guarantee deposits | Amortized cost |  |  |
Disclosure of financial assets [line items] |  |  |
Other current financial assets | 1,492 | 3,360 |
Equity |  |  |
Disclosure of financial assets [line items] |  |  |
Other current financial assets | 3,262 | 3,204 |
Equity | Level 1 |  |  |
Disclosure of financial assets [line items] |  |  |
Other current financial assets | 3,262 | 3,204 |
Equity | Level 2 |  |  |
Disclosure of financial assets [line items] |  |  |
Other current financial assets | 0 | 0 |
Equity | Level 3 |  |  |
Disclosure of financial assets [line items] |  |  |
Other current financial assets | 0 | 0 |
Equity | FVPL |  |  |
Disclosure of financial assets [line items] |  |  |
Other current financial assets | 3,262 | 3,204 | € 1,141
Equity | FVOCI |  |  |
Disclosure of financial assets [line items] |  |  |
Other current financial assets | 0 | 0 |
Equity | Amortized cost |  |  |
Disclosure of financial assets [line items] |  |  |
Other current financial assets | 0 | 0 |
Financial receivables |  |  |
Disclosure of financial assets [line items] |  |  |
Other current financial assets | 258 | 270 |
Financial receivables | Level 1 |  |  |
Disclosure of financial assets [line items] |  |  |
Other current financial assets | 0 | 0 |
Financial receivables | Level 2 |  |  |
Disclosure of financial assets [line items] |  |  |
Other current financial assets | 258 | 270 |
Financial receivables | Level 3 |  |  |
Disclosure of financial assets [line items] |  |  |
Other current financial assets | 0 | 0 |
Financial receivables | FVPL |  |  |
Disclosure of financial assets [line items] |  |  |
Other current financial assets | 0 | 0 |
Financial receivables | FVOCI |  |  |
Disclosure of financial assets [line items] |  |  |
Other current financial assets | 0 | 0 |
Financial receivables | Amortized cost |  |  |
Disclosure of financial assets [line items] |  |  |
Other current financial assets | € 258 | € 270 |

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