v3.26.1
Share based compensation reserve - Director and Senior Management Share Awards (Narrative) (Details)
€ in Millions
3 Months Ended 6 Months Ended
Jun. 22, 2026
shares
$ / shares
Jun. 22, 2026
$ / shares
Jul. 10, 2025
$ / shares
shares
Jul. 10, 2024
$ / shares
Jun. 30, 2026
EUR (€)
Jun. 30, 2025
EUR (€)
Jun. 30, 2026
EUR (€)
shares
Jun. 30, 2025
EUR (€)
shares
Jul. 30, 2026
Rate
Jun. 30, 2026
$ / shares
May 07, 2026
Dec. 31, 2025
$ / shares
Oct. 16, 2025
$ / shares
Disclosure of terms and conditions of share-based payment arrangement [line items]                          
Key management personnel compensation | €         € (4.7) € 0.3 € (3.3) € 3.8          
Ordinary shares                          
Disclosure of terms and conditions of share-based payment arrangement [line items]                          
Shares issued, price per share (in dollars per share) | $ / shares                   $ 10.33   $ 16.28  
Key Management Personnel Of Entity Or Parent, Non-Executive Director [Member]                          
Disclosure of terms and conditions of share-based payment arrangement [line items]                          
Number of other equity instruments exercised or vested in share-based payment arrangement (in shares) 49,092 29,707           24,135          
Liabilities from share-based payment transactions (in shares) 19,385   12,603                    
New awards granted in the period (in shares)   94,110 49,092 36,738                  
New awards granted in the period (in shares)   94,110 49,092 36,738                  
Restricted shares                          
Disclosure of terms and conditions of share-based payment arrangement [line items]                          
Number of other equity instruments exercised or vested in share-based payment arrangement (in shares)             49,000 631,994          
New awards granted in the period (in shares)             1,213,028 1,159,853          
New awards granted in the period (in shares)             1,213,028 1,159,853          
Restricted shares | January 1, 2022                          
Disclosure of terms and conditions of share-based payment arrangement [line items]                          
Number of other equity instruments exercised or vested in share-based payment arrangement (in shares)               349,823          
Liabilities from share-based payment transactions (in shares)               282,171          
Restricted shares | January 1, 2023                          
Disclosure of terms and conditions of share-based payment arrangement [line items]                          
Number of other equity instruments exercised or vested in share-based payment arrangement (in shares)             28,683            
Liabilities from share-based payment transactions (in shares)             20,317            
Restricted shares | Other Awards                          
Disclosure of terms and conditions of share-based payment arrangement [line items]                          
Number of other equity instruments exercised or vested in share-based payment arrangement (in shares)             56,000 62,000          
Restricted shares | January 1, 2025                          
Disclosure of terms and conditions of share-based payment arrangement [line items]                          
Number of other equity instruments exercised or vested in share-based payment arrangement (in shares)               114,669          
Restricted shares | Key Management Personnel Of Entity Or Parent, Non-Executive Director [Member]                          
Disclosure of terms and conditions of share-based payment arrangement [line items]                          
Shares issued, price per share (in dollars per share) | $ / shares $ 10.02 $ 10.02 $ 17.11 $ 16.33                 $ 16.71
Restricted shares | January 1, 2026                          
Disclosure of terms and conditions of share-based payment arrangement [line items]                          
Number of other equity instruments exercised or vested in share-based payment arrangement (in shares)             114,997            
Restricted shares | January 1, 2022                          
Disclosure of terms and conditions of share-based payment arrangement [line items]                          
Number of other equity instruments exercised or vested in share-based payment arrangement (in shares)               555,994          
New awards granted in the period (in shares)               0          
New awards granted in the period (in shares)               0          
Restricted shares | Other Awards                          
Disclosure of terms and conditions of share-based payment arrangement [line items]                          
Number of other equity instruments exercised or vested in share-based payment arrangement (in shares)             49,000 76,000          
New awards granted in the period (in shares)             56,000 62,000          
New awards granted in the period (in shares)             56,000 62,000          
Restricted shares | January 1, 2023                          
Disclosure of terms and conditions of share-based payment arrangement [line items]                          
Number of other equity instruments exercised or vested in share-based payment arrangement (in shares)             0            
New awards granted in the period (in shares)             0 0          
New awards granted in the period (in shares)             0 0          
Restricted shares | January 1, 2024                          
Disclosure of terms and conditions of share-based payment arrangement [line items]                          
Number of other equity instruments exercised or vested in share-based payment arrangement (in shares)             0            
New awards granted in the period (in shares)             0 0          
New awards granted in the period (in shares)             0 0          
Performance share awards | January 1, 2025                          
Disclosure of terms and conditions of share-based payment arrangement [line items]                          
New awards granted in the period (in shares)               1,024,922          
New awards granted in the period (in shares)               1,024,922          
Performance share awards | January 1, 2026                          
Disclosure of terms and conditions of share-based payment arrangement [line items]                          
New awards granted in the period (in shares)             1,098,031            
New awards granted in the period (in shares)             1,098,031            
Share options [member] | 2026 Share options                          
Disclosure of terms and conditions of share-based payment arrangement [line items]                          
Number of share options outstanding in share-based payment arrangement                     9,925,000    
option life             3 years            
Option life, share options granted maximum             5 years            
Description of method used and assumptions made to incorporate effects of expected early exercise, share options granted | Rate                 10.00%