v3.26.3
Significant events for the year ended December 31, 2025 and the six-month period ended June 30, 2026 and subsequent events - Subsequent events (Details)
€ / shares in Units, $ / shares in Units, € in Millions, $ in Millions
1 Months Ended 6 Months Ended
Jul. 06, 2026
USD ($)
$ / shares
shares
Jul. 06, 2026
EUR (€)
shares
Jul. 28, 2025
USD ($)
$ / shares
shares
Jul. 28, 2025
EUR (€)
shares
Sep. 30, 2026
shares
Jul. 31, 2026
shares
Jun. 30, 2026
shares
Jul. 06, 2026
€ / shares
May 07, 2026
$ / shares
May 07, 2026
€ / shares
Apr. 30, 2026
Jul. 28, 2025
€ / shares
Jul. 23, 2025
Disclosure of detailed information about borrowings [line items]                          
Number of ordinary shares issued (in shares)             877,310            
Closing foreign exchange rate             1.1394       1.1702   1.1726
Proceeds from issue of ordinary shares     $ 747.5 € 637.5                  
Net proceeds from issuance of ordinary shares     $ 700.3 € 597.2                  
ADS                          
Disclosure of detailed information about borrowings [line items]                          
Number of ordinary shares issued (in shares)     11,679,400 11,679,400                  
Issue of equity, offering price per share (in dollar/euro per share) | $ / shares     $ 64.00           $ 111.57        
Ordinary shares                          
Disclosure of detailed information about borrowings [line items]                          
Issue of equity, offering price per share (in dollar/euro per share) | € / shares                   € 95.34   € 54.58  
Completion of a public offering                          
Disclosure of detailed information about borrowings [line items]                          
Proceeds from issue of ordinary shares $ 920.0 € 807.4                      
Net proceeds from issuance of ordinary shares $ 874.1 € 767.1                      
Completion of a public offering | ADS                          
Disclosure of detailed information about borrowings [line items]                          
Number of ordinary shares issued (in shares) 7,360,000 7,360,000                      
Issue of equity, offering price per share (in dollar/euro per share) | $ / shares $ 125.00                        
Completion of a public offering | Ordinary shares                          
Disclosure of detailed information about borrowings [line items]                          
Issue of equity, offering price per share (in dollar/euro per share) | € / shares               € 109.71          
July share-based compensation plan | AGA-2026-5                          
Disclosure of detailed information about borrowings [line items]                          
Number of instruments issued (in shares)           25,620              
July share-based compensation plan | AGA-2026-5 | Tranche 1                          
Disclosure of detailed information about borrowings [line items]                          
Vesting percentage           50.00%              
Vesting period           2 years              
July share-based compensation plan | AGA-2026-5 | Tranche 2                          
Disclosure of detailed information about borrowings [line items]                          
Vesting percentage           25.00%              
Vesting period           3 years              
July share-based compensation plan | AGA-2026-5 | Tranche 3                          
Disclosure of detailed information about borrowings [line items]                          
Vesting percentage           25.00%              
Vesting period           4 years              
September Share-Based Compensation Plan [Member] | AGA-2026-6 [Member]                          
Disclosure of detailed information about borrowings [line items]                          
Number of instruments issued (in shares)         45,551                
September Share-Based Compensation Plan [Member] | AGA-2026-6 [Member] | Tranche 1                          
Disclosure of detailed information about borrowings [line items]                          
Vesting percentage         50.00%                
Vesting period         2 years                
September Share-Based Compensation Plan [Member] | AGA-2026-6 [Member] | Tranche 2                          
Disclosure of detailed information about borrowings [line items]                          
Vesting percentage         25.00%                
Vesting period         3 years                
September Share-Based Compensation Plan [Member] | AGA-2026-6 [Member] | Tranche 3                          
Disclosure of detailed information about borrowings [line items]                          
Vesting percentage         25.00%                
Vesting period         4 years