v3.26.1
Share Based Payments - Schedule of stock option arrangement (Details)
1 Months Ended
Dec. 31, 2025
shares
$ / shares
Sep. 30, 2025
$ / shares
Jun. 30, 2025
$ / shares
Mar. 31, 2025
$ / shares
Dec. 31, 2024
shares
$ / shares
Sep. 30, 2024
$ / shares
Jun. 30, 2024
$ / shares
Apr. 30, 2024
$ / shares
Dec. 31, 2023
shares
$ / shares
Oct. 31, 2023
$ / shares
Jul. 31, 2023
$ / shares
Apr. 30, 2023
$ / shares
Dec. 31, 2022
shares
Disclosure of terms and conditions of share-based payment arrangement [line items]                          
Exercise price per stock options (in USD per share) | $ / shares $ 837.78 $ 717.61 $ 561.74 $ 596.99 $ 618.56 $ 535.95 $ 445.76 $ 396.30 $ 329.26 $ 485.01 $ 387.35 $ 370.34  
Outstanding stock options (in shares) | shares 3,883,114       4,300,760       5,118,949       5,511,767
Belgian taxed beneficiaries | Bottom of range                          
Disclosure of terms and conditions of share-based payment arrangement [line items]                          
Time period for beneficiaries to choose contractual term (in years) 5 years                        
Belgian taxed beneficiaries | Top of range                          
Disclosure of terms and conditions of share-based payment arrangement [line items]                          
Time period for beneficiaries to choose contractual term (in years) 10 years                        
2024 | 2.87                          
Disclosure of terms and conditions of share-based payment arrangement [line items]                          
Exercise price per stock options (in USD per share) | $ / shares $ 2.87                        
Outstanding stock options (in shares) | shares 0       0       3,308        
2024 | 4.64                          
Disclosure of terms and conditions of share-based payment arrangement [line items]                          
Exercise price per stock options (in USD per share) | $ / shares $ 4.64                        
Outstanding stock options (in shares) | shares 0       0       532        
2024 | 8.43                          
Disclosure of terms and conditions of share-based payment arrangement [line items]                          
Exercise price per stock options (in USD per share) | $ / shares $ 8.43                        
Outstanding stock options (in shares) | shares 0       0       81,500        
2024 | 133.35                          
Disclosure of terms and conditions of share-based payment arrangement [line items]                          
Exercise price per stock options (in USD per share) | $ / shares $ 133.35                        
Outstanding stock options (in shares) | shares 0       0       26,171        
2024 | 159.51                          
Disclosure of terms and conditions of share-based payment arrangement [line items]                          
Exercise price per stock options (in USD per share) | $ / shares $ 159.51                        
Outstanding stock options (in shares) | shares 0       0       104,176        
2025 | 13.44                          
Disclosure of terms and conditions of share-based payment arrangement [line items]                          
Exercise price per stock options (in USD per share) | $ / shares $ 13.44                        
Outstanding stock options (in shares) | shares 0       400       1,600        
2025 | 11.13                          
Disclosure of terms and conditions of share-based payment arrangement [line items]                          
Exercise price per stock options (in USD per share) | $ / shares $ 11.13                        
Outstanding stock options (in shares) | shares 0       78,690       99,326        
2025 | 140.45                          
Disclosure of terms and conditions of share-based payment arrangement [line items]                          
Exercise price per stock options (in USD per share) | $ / shares $ 140.45                        
Outstanding stock options (in shares) | shares 0       3,758       16,712        
2025 | 230.48                          
Disclosure of terms and conditions of share-based payment arrangement [line items]                          
Exercise price per stock options (in USD per share) | $ / shares $ 230.48                        
Outstanding stock options (in shares) | shares 0       7,926       126,331        
2025 | 235.26                          
Disclosure of terms and conditions of share-based payment arrangement [line items]                          
Exercise price per stock options (in USD per share) | $ / shares $ 235.26                        
Outstanding stock options (in shares) | shares 0       5,629       31,424        
2025 | 290.93                          
Disclosure of terms and conditions of share-based payment arrangement [line items]                          
Exercise price per stock options (in USD per share) | $ / shares $ 290.93                        
Outstanding stock options (in shares) | shares 0       90,425       202,205        
2025 | 363.31                          
Disclosure of terms and conditions of share-based payment arrangement [line items]                          
Exercise price per stock options (in USD per share) | $ / shares $ 363.31                        
Outstanding stock options (in shares) | shares 0       0       16,000        
2026 | 13.48                          
Disclosure of terms and conditions of share-based payment arrangement [line items]                          
Exercise price per stock options (in USD per share) | $ / shares $ 13.48                        
Outstanding stock options (in shares) | shares 75,643       93,378       97,972        
2026 | 13.37                          
Disclosure of terms and conditions of share-based payment arrangement [line items]                          
Exercise price per stock options (in USD per share) | $ / shares $ 13.37                        
Outstanding stock options (in shares) | shares 10,000       14,000       24,400        
2026 | 16.61                          
Disclosure of terms and conditions of share-based payment arrangement [line items]                          
Exercise price per stock options (in USD per share) | $ / shares $ 16.61                        
Outstanding stock options (in shares) | shares 95,749       103,859       111,811        
2026 | 275.42                          
Disclosure of terms and conditions of share-based payment arrangement [line items]                          
Exercise price per stock options (in USD per share) | $ / shares $ 275.42                        
Outstanding stock options (in shares) | shares 9,413       23,491       23,491        
2026 | 299.74                          
Disclosure of terms and conditions of share-based payment arrangement [line items]                          
Exercise price per stock options (in USD per share) | $ / shares $ 299.74                        
Outstanding stock options (in shares) | shares 22,733       59,527       59,626        
2026 | 304.91                          
Disclosure of terms and conditions of share-based payment arrangement [line items]                          
Exercise price per stock options (in USD per share) | $ / shares $ 304.91                        
Outstanding stock options (in shares) | shares 5,085       45,044       45,228        
2026 | 363.31                          
Disclosure of terms and conditions of share-based payment arrangement [line items]                          
Exercise price per stock options (in USD per share) | $ / shares $ 363.31                        
Outstanding stock options (in shares) | shares 47,559       80,179       80,425        
2027 | 21.63                          
Disclosure of terms and conditions of share-based payment arrangement [line items]                          
Exercise price per stock options (in USD per share) | $ / shares $ 21.63                        
Outstanding stock options (in shares) | shares 31,646       35,046       38,434        
2027 | 24.87                          
Disclosure of terms and conditions of share-based payment arrangement [line items]                          
Exercise price per stock options (in USD per share) | $ / shares $ 24.87                        
Outstanding stock options (in shares) | shares 136,705       152,085       225,852        
2027 | 331.94                          
Disclosure of terms and conditions of share-based payment arrangement [line items]                          
Exercise price per stock options (in USD per share) | $ / shares $ 331.94                        
Outstanding stock options (in shares) | shares 13,876       13,876       13,957        
2027 | 420.06                          
Disclosure of terms and conditions of share-based payment arrangement [line items]                          
Exercise price per stock options (in USD per share) | $ / shares $ 420.06                        
Outstanding stock options (in shares) | shares 57,024       57,118       58,091        
2027 | 432.99                          
Disclosure of terms and conditions of share-based payment arrangement [line items]                          
Exercise price per stock options (in USD per share) | $ / shares $ 432.99                        
Outstanding stock options (in shares) | shares 13,764       13,764       13,764        
2027 | 422.53                          
Disclosure of terms and conditions of share-based payment arrangement [line items]                          
Exercise price per stock options (in USD per share) | $ / shares $ 422.53                        
Outstanding stock options (in shares) | shares 134,492       134,748       136,459        
2028 | 94.96                          
Disclosure of terms and conditions of share-based payment arrangement [line items]                          
Exercise price per stock options (in USD per share) | $ / shares $ 94.96                        
Outstanding stock options (in shares) | shares 6,670       7,370       13,890        
2028 | 101.43                          
Disclosure of terms and conditions of share-based payment arrangement [line items]                          
Exercise price per stock options (in USD per share) | $ / shares $ 101.43                        
Outstanding stock options (in shares) | shares 187,281       190,011       225,457        
2028 | 400.32                          
Disclosure of terms and conditions of share-based payment arrangement [line items]                          
Exercise price per stock options (in USD per share) | $ / shares $ 400.32                        
Outstanding stock options (in shares) | shares 15,014       15,014       15,014        
2028 | 417.60                          
Disclosure of terms and conditions of share-based payment arrangement [line items]                          
Exercise price per stock options (in USD per share) | $ / shares $ 417.60                        
Outstanding stock options (in shares) | shares 120,517       121,071       127,490        
2028 | 541.21                          
Disclosure of terms and conditions of share-based payment arrangement [line items]                          
Exercise price per stock options (in USD per share) | $ / shares $ 541.21                        
Outstanding stock options (in shares) | shares 2,173       2,235       2,235        
2028 | 350.97                          
Disclosure of terms and conditions of share-based payment arrangement [line items]                          
Exercise price per stock options (in USD per share) | $ / shares $ 350.97                        
Outstanding stock options (in shares) | shares 6,043       6,043       0        
2029 | 133.35                          
Disclosure of terms and conditions of share-based payment arrangement [line items]                          
Exercise price per stock options (in USD per share) | $ / shares $ 133.35                        
Outstanding stock options (in shares) | shares 33,513       44,158       71,573        
2029 | 159.51                          
Disclosure of terms and conditions of share-based payment arrangement [line items]                          
Exercise price per stock options (in USD per share) | $ / shares $ 159.51                        
Outstanding stock options (in shares) | shares 251,019       275,154       370,566        
2029 | 430.17                          
Disclosure of terms and conditions of share-based payment arrangement [line items]                          
Exercise price per stock options (in USD per share) | $ / shares $ 430.17                        
Outstanding stock options (in shares) | shares 3,202       3,291       0        
2029 | 489.27                          
Disclosure of terms and conditions of share-based payment arrangement [line items]                          
Exercise price per stock options (in USD per share) | $ / shares $ 489.27                        
Outstanding stock options (in shares) | shares 87,700       88,157       0        
2029 | 562.47                          
Disclosure of terms and conditions of share-based payment arrangement [line items]                          
Exercise price per stock options (in USD per share) | $ / shares $ 562.47                        
Outstanding stock options (in shares) | shares 6,023       6,023       0        
2029 | 699.60                          
Disclosure of terms and conditions of share-based payment arrangement [line items]                          
Exercise price per stock options (in USD per share) | $ / shares $ 699.60                        
Outstanding stock options (in shares) | shares 2,079       2,137       0        
2030 | 140.45                          
Disclosure of terms and conditions of share-based payment arrangement [line items]                          
Exercise price per stock options (in USD per share) | $ / shares $ 140.45                        
Outstanding stock options (in shares) | shares 18,291       30,675       50,801        
2030 | 230.48                          
Disclosure of terms and conditions of share-based payment arrangement [line items]                          
Exercise price per stock options (in USD per share) | $ / shares $ 230.48                        
Outstanding stock options (in shares) | shares 69,359       79,691       160,677        
2030 | 235.26                          
Disclosure of terms and conditions of share-based payment arrangement [line items]                          
Exercise price per stock options (in USD per share) | $ / shares $ 235.26                        
Outstanding stock options (in shares) | shares 31,388       47,908       78,534        
2030 | 290.93                          
Disclosure of terms and conditions of share-based payment arrangement [line items]                          
Exercise price per stock options (in USD per share) | $ / shares $ 290.93                        
Outstanding stock options (in shares) | shares 246,192       351,911       559,173        
2030 | 648.60                          
Disclosure of terms and conditions of share-based payment arrangement [line items]                          
Exercise price per stock options (in USD per share) | $ / shares $ 648.60                        
Outstanding stock options (in shares) | shares 3,763       0       0        
2030 | 563.18                          
Disclosure of terms and conditions of share-based payment arrangement [line items]                          
Exercise price per stock options (in USD per share) | $ / shares $ 563.18                        
Outstanding stock options (in shares) | shares 64,565       0       0        
2030 | 718.16                          
Disclosure of terms and conditions of share-based payment arrangement [line items]                          
Exercise price per stock options (in USD per share) | $ / shares $ 718.16                        
Outstanding stock options (in shares) | shares 1,519       0       0        
2031 | 275.42                          
Disclosure of terms and conditions of share-based payment arrangement [line items]                          
Exercise price per stock options (in USD per share) | $ / shares $ 275.42                        
Outstanding stock options (in shares) | shares 8,820       19,486       27,201        
2031 | 299.74                          
Disclosure of terms and conditions of share-based payment arrangement [line items]                          
Exercise price per stock options (in USD per share) | $ / shares $ 299.74                        
Outstanding stock options (in shares) | shares 38,475       96,888       128,600        
2031 | 304.91                          
Disclosure of terms and conditions of share-based payment arrangement [line items]                          
Exercise price per stock options (in USD per share) | $ / shares $ 304.91                        
Outstanding stock options (in shares) | shares 24,697       39,359       62,138        
2031 | 363.31                          
Disclosure of terms and conditions of share-based payment arrangement [line items]                          
Exercise price per stock options (in USD per share) | $ / shares $ 363.31                        
Outstanding stock options (in shares) | shares 124,043       169,196       226,520        
2032 | 331.94                          
Disclosure of terms and conditions of share-based payment arrangement [line items]                          
Exercise price per stock options (in USD per share) | $ / shares $ 331.94                        
Outstanding stock options (in shares) | shares 19,412       34,773       58,255        
2032 | 420.06                          
Disclosure of terms and conditions of share-based payment arrangement [line items]                          
Exercise price per stock options (in USD per share) | $ / shares $ 420.06                        
Outstanding stock options (in shares) | shares 104,811       144,505       192,291        
2032 | 432.99                          
Disclosure of terms and conditions of share-based payment arrangement [line items]                          
Exercise price per stock options (in USD per share) | $ / shares $ 432.99                        
Outstanding stock options (in shares) | shares 41,692       56,820       73,288        
2032 | 422.53                          
Disclosure of terms and conditions of share-based payment arrangement [line items]                          
Exercise price per stock options (in USD per share) | $ / shares $ 422.53                        
Outstanding stock options (in shares) | shares 179,832       249,755       347,765        
2033 | 400.32                          
Disclosure of terms and conditions of share-based payment arrangement [line items]                          
Exercise price per stock options (in USD per share) | $ / shares $ 400.32                        
Outstanding stock options (in shares) | shares 28,285       36,065       43,856        
2033 | 417.60                          
Disclosure of terms and conditions of share-based payment arrangement [line items]                          
Exercise price per stock options (in USD per share) | $ / shares $ 417.60                        
Outstanding stock options (in shares) | shares 318,762       415,859       495,821        
2033 | 541.21                          
Disclosure of terms and conditions of share-based payment arrangement [line items]                          
Exercise price per stock options (in USD per share) | $ / shares $ 541.21                        
Outstanding stock options (in shares) | shares 43,035       56,782       69,704        
2033 | 350.97                          
Disclosure of terms and conditions of share-based payment arrangement [line items]                          
Exercise price per stock options (in USD per share) | $ / shares $ 350.97                        
Outstanding stock options (in shares) | shares 43,405       61,806       79,305        
2034 | 430.17                          
Disclosure of terms and conditions of share-based payment arrangement [line items]                          
Exercise price per stock options (in USD per share) | $ / shares $ 430.17                        
Outstanding stock options (in shares) | shares 27,767       37,642       0        
2034 | 489.27                          
Disclosure of terms and conditions of share-based payment arrangement [line items]                          
Exercise price per stock options (in USD per share) | $ / shares $ 489.27                        
Outstanding stock options (in shares) | shares 454,081       553,251       0        
2034 | 562.47                          
Disclosure of terms and conditions of share-based payment arrangement [line items]                          
Exercise price per stock options (in USD per share) | $ / shares $ 562.47                        
Outstanding stock options (in shares) | shares 23,579       26,622       0        
2034 | 699.60                          
Disclosure of terms and conditions of share-based payment arrangement [line items]                          
Exercise price per stock options (in USD per share) | $ / shares $ 699.60                        
Outstanding stock options (in shares) | shares 15,737       18,159       0        
2035 | 648.60                          
Disclosure of terms and conditions of share-based payment arrangement [line items]                          
Exercise price per stock options (in USD per share) | $ / shares $ 648.60                        
Outstanding stock options (in shares) | shares 16,453       0       0        
2035 | 563.18                          
Disclosure of terms and conditions of share-based payment arrangement [line items]                          
Exercise price per stock options (in USD per share) | $ / shares $ 563.18                        
Outstanding stock options (in shares) | shares 513,390       0       0        
2035 | 718.16                          
Disclosure of terms and conditions of share-based payment arrangement [line items]                          
Exercise price per stock options (in USD per share) | $ / shares $ 718.16                        
Outstanding stock options (in shares) | shares 29,243       0       0        
2030-2035 | 837.78                          
Disclosure of terms and conditions of share-based payment arrangement [line items]                          
Exercise price per stock options (in USD per share) | $ / shares $ 837.78                        
Outstanding stock options (in shares) | shares 17,595       0       0