v3.26.1
Share based payments - Summary of subscription rights outstanding and exercisable (Details)
12 Months Ended
Nov. 19, 2025
shares
Aug. 07, 2025
shares
May 27, 2025
shares
Dec. 31, 2025
EquityInstruments
€ / shares
Dec. 31, 2024
EquityInstruments
€ / shares
Dec. 31, 2023
EquityInstruments
€ / shares
Dec. 31, 2022
EquityInstruments
€ / shares
Disclosure of terms and conditions of share-based payment arrangement [line items]              
Exercise Price | € / shares       € 65.24 € 73.19 € 77.93 € 83.12
Outstanding at the beginning of the year       11,911,109 11,472,520 10,816,856  
Granted during the year 420,000 905,000 925,000 2,250,000 1,381,000 1,538,400  
Exercised during year           (61,560)  
Forfeited during the year       (232,299) (547,911) (544,676)  
Expired during the year       (700,000) (394,500) (276,500)  
Outstanding at the end of the year       13,228,810 11,911,109 11,472,520  
Exercisable       8,822,812 5,182,941 5,836,538 2,574,218
Subscription rights              
Disclosure of terms and conditions of share-based payment arrangement [line items]              
Exercise Price | € / shares       € 65.24 € 73.19 € 77.93  
Outstanding at the beginning of the year       11,911,109 11,472,520    
Granted during the year       2,250,000      
Forfeited during the year       (232,299)      
Expired during the year       (700,000)      
Outstanding at the end of the year       13,228,810 11,911,109 11,472,520  
Exercisable       8,822,812      
2016 (B) allocated on January 2017              
Disclosure of terms and conditions of share-based payment arrangement [line items]              
Exercise Price | € / shares       € 62.5      
Outstanding at the beginning of the year       10,000      
Expired during the year       (10,000)      
Outstanding at the end of the year         10,000    
2017 allocated on May 2017              
Disclosure of terms and conditions of share-based payment arrangement [line items]              
Exercise Price | € / shares       € 80.57      
Outstanding at the beginning of the year       585,000      
Expired during the year       (585,000)      
Outstanding at the end of the year         585,000    
2017 RMV allocated on May 2017              
Disclosure of terms and conditions of share-based payment arrangement [line items]              
Exercise Price | € / shares       € 80.57      
Outstanding at the beginning of the year       105,000      
Expired during the year       (105,000)      
Outstanding at the end of the year         105,000    
2018 allocated on April 2018              
Disclosure of terms and conditions of share-based payment arrangement [line items]              
Exercise Price | € / shares       € 79.88      
Outstanding at the beginning of the year       929,995      
Forfeited during the year       (5,000)      
Outstanding at the end of the year       924,995 929,995    
Exercisable       924,995      
2018 RMV allocated on April 2018              
Disclosure of terms and conditions of share-based payment arrangement [line items]              
Exercise Price | € / shares       € 79.88      
Outstanding at the beginning of the year       117,500      
Outstanding at the end of the year       117,500 117,500    
Exercisable       117,500      
2019 allocated on April 2019              
Disclosure of terms and conditions of share-based payment arrangement [line items]              
Exercise Price | € / shares       € 95.11      
Outstanding at the beginning of the year       1,144,990      
Forfeited during the year       (17,000)      
Outstanding at the end of the year       1,127,990 1,144,990    
Exercisable       1,127,990      
2019 RMV allocated on April 2019              
Disclosure of terms and conditions of share-based payment arrangement [line items]              
Exercise Price | € / shares       € 95.11      
Outstanding at the beginning of the year       153,500      
Forfeited during the year       (1,750)      
Outstanding at the end of the year       151,750 153,500    
Exercisable       151,750      
2020 allocated on April 2020              
Disclosure of terms and conditions of share-based payment arrangement [line items]              
Exercise Price | € / shares       € 168.42      
Outstanding at the beginning of the year       1,315,692      
Forfeited during the year       (13,456)      
Outstanding at the end of the year       1,302,236 1,315,692    
Exercisable       1,302,236      
2020 RMV allocated on April 2020              
Disclosure of terms and conditions of share-based payment arrangement [line items]              
Exercise Price | € / shares       € 168.42      
Outstanding at the beginning of the year       179,175      
Forfeited during the year       (11,100)      
Outstanding at the end of the year       168,075 179,175    
Exercisable       168,075      
2021 BE allocated on April 2021              
Disclosure of terms and conditions of share-based payment arrangement [line items]              
Exercise Price | € / shares       € 64.76      
Outstanding at the beginning of the year       1,015,033      
Forfeited during the year       (252)      
Outstanding at the end of the year       1,014,781 1,015,033    
Exercisable       1,014,781      
2021 RMV allocated on April 2021              
Disclosure of terms and conditions of share-based payment arrangement [line items]              
Exercise Price | € / shares       € 64.76      
Outstanding at the beginning of the year       218,925      
Forfeited during the year       (8,325)      
Outstanding at the end of the year       210,600 218,925    
Exercisable       210,600      
2021 ROW allocated on April 2021              
Disclosure of terms and conditions of share-based payment arrangement [line items]              
Exercise Price | € / shares       € 64.76      
Outstanding at the beginning of the year       591,450      
Forfeited during the year       (5,625)      
Outstanding at the end of the year       585,825 591,450    
Exercisable       585,825      
2022 (A) allocated on January 2022              
Disclosure of terms and conditions of share-based payment arrangement [line items]              
Exercise Price | € / shares       € 46.18      
Outstanding at the beginning of the year       30,000      
Outstanding at the end of the year       30,000 30,000    
Exercisable       30,000      
2022 (B) allocated on January 2022              
Disclosure of terms and conditions of share-based payment arrangement [line items]              
Exercise Price | € / shares       € 50      
Outstanding at the beginning of the year       1,000,000      
Outstanding at the end of the year       1,000,000 1,000,000    
Exercisable       1,000,000      
2022 BE allocated on May 2022              
Disclosure of terms and conditions of share-based payment arrangement [line items]              
Exercise Price | € / shares       € 57.46      
Outstanding at the beginning of the year       804,232      
Forfeited during the year       (1,588)      
Outstanding at the end of the year       802,644 804,232    
Exercisable       802,644      
2022 BE allocated on August 2022              
Disclosure of terms and conditions of share-based payment arrangement [line items]              
Exercise Price | € / shares       € 51.58      
Outstanding at the beginning of the year       78,000      
Forfeited during the year       (6,000)      
Outstanding at the end of the year       72,000 78,000    
Exercisable       72,000      
2022 RMV allocated on May 2022              
Disclosure of terms and conditions of share-based payment arrangement [line items]              
Exercise Price | € / shares       € 57.46      
Outstanding at the beginning of the year       199,069      
Forfeited during the year       (4,780)      
Outstanding at the end of the year       194,289 199,069    
Exercisable       194,289      
2022 ROW allocated on May 2022              
Disclosure of terms and conditions of share-based payment arrangement [line items]              
Exercise Price | € / shares       € 57.46      
Outstanding at the beginning of the year       631,100      
Forfeited during the year       (16,673)      
Outstanding at the end of the year       614,427 631,100    
Exercisable       614,427      
2022 BE/ROW allocated on August 2022              
Disclosure of terms and conditions of share-based payment arrangement [line items]              
Exercise Price | € / shares       € 51.58      
Outstanding at the beginning of the year       60,000      
Outstanding at the end of the year       60,000 60,000    
Exercisable       60,000      
2023 BE allocated on May 2023              
Disclosure of terms and conditions of share-based payment arrangement [line items]              
Exercise Price | € / shares       € 35.11      
Outstanding at the beginning of the year       593,250      
Outstanding at the end of the year       593,250 593,250    
2023 RMV allocated on May 2023              
Disclosure of terms and conditions of share-based payment arrangement [line items]              
Exercise Price | € / shares       € 35.11      
Outstanding at the beginning of the year       100,000      
Outstanding at the end of the year       100,000 100,000    
Exercisable       50,000      
2023 ROW allocated on May 2023              
Disclosure of terms and conditions of share-based payment arrangement [line items]              
Exercise Price | € / shares       € 35.11      
Outstanding at the beginning of the year       496,900      
Forfeited during the year       (28,750)      
Outstanding at the end of the year       468,150 496,900    
Exercisable       235,950      
2023 BE allocated on June 2023              
Disclosure of terms and conditions of share-based payment arrangement [line items]              
Exercise Price | € / shares       € 38.58      
Outstanding at the beginning of the year       200,000      
Outstanding at the end of the year       200,000 200,000    
2023 ROW allocated on November 2023              
Disclosure of terms and conditions of share-based payment arrangement [line items]              
Exercise Price | € / shares       € 32.99      
Outstanding at the beginning of the year       20,000      
Outstanding at the end of the year       20,000 20,000    
Exercisable       10,000      
2024 BE allocated in May 2024              
Disclosure of terms and conditions of share-based payment arrangement [line items]              
Exercise Price | € / shares       € 26.9      
Outstanding at the beginning of the year       667,798      
Forfeited during the year       (50,000)      
Outstanding at the end of the year       617,798 667,798    
2024 RMV allocated in May 2024              
Disclosure of terms and conditions of share-based payment arrangement [line items]              
Exercise Price | € / shares       € 26.9      
Outstanding at the beginning of the year       21,500      
Outstanding at the end of the year       21,500 21,500    
Exercisable       5,375      
2024 ROW allocated on May 2024              
Disclosure of terms and conditions of share-based payment arrangement [line items]              
Exercise Price | € / shares       € 26.9      
Outstanding at the beginning of the year       602,000      
Forfeited during the year       (62,000)      
Outstanding at the end of the year       540,000 602,000    
Exercisable       135,000      
2024 BE allocated in October 2024              
Disclosure of terms and conditions of share-based payment arrangement [line items]              
Exercise Price | € / shares       € 25.88      
Outstanding at the beginning of the year       3,500      
Outstanding at the end of the year       3,500 3,500    
2024 ROW allocated in October 2024              
Disclosure of terms and conditions of share-based payment arrangement [line items]              
Exercise Price | € / shares       € 25.88      
Outstanding at the beginning of the year       37,500      
Outstanding at the end of the year       37,500 37,500    
Exercisable       9,375      
2025 (A) allocated in May 2025              
Disclosure of terms and conditions of share-based payment arrangement [line items]              
Exercise Price | € / shares       € 25.64      
Granted during the year       925,000      
Outstanding at the end of the year       925,000      
2025 (B) allocated in August 2025              
Disclosure of terms and conditions of share-based payment arrangement [line items]              
Exercise Price | € / shares       € 28.16      
Granted during the year       905,000      
Outstanding at the end of the year       905,000      
2025 (C) allocated in November 2025              
Disclosure of terms and conditions of share-based payment arrangement [line items]              
Exercise Price | € / shares       € 26.75      
Granted during the year       420,000      
Outstanding at the end of the year       420,000