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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