v3.26.1
Employment, Post-Employment Benefits and Share Compensation Plans - Share compensation plans (Details)
1 Months Ended 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Oct. 31, 2023
Mar. 31, 2023
Oct. 31, 2022
May 31, 2022
Jan. 31, 2022
Oct. 31, 2021
May 31, 2021
Feb. 28, 2021
Dec. 31, 2025
USD ($)
EquityInstruments
item
Y
€ / shares
shares
Dec. 31, 2024
EquityInstruments
Dec. 31, 2023
EquityInstruments
Feb. 14, 2023
Employment, Post-Employment Benefits and Share Compensation Plans                            
Contribution per share | € / shares                     € 1      
Restricted Share Awards                            
Employment, Post-Employment Benefits and Share Compensation Plans                            
Number of subscription rights to shares | item                     1      
Restricted Share Awards | Restricted Share Plan 2020                            
Employment, Post-Employment Benefits and Share Compensation Plans                            
Number of bearer shares that may be granted                     1,200,000      
Threshold number of consecutive calendar years for achievement of targets | Y                     4      
Assumed fluctuation of share price, share units granted     5.00%   5.00%     5.00%            
Restricted Share Awards | Restricted Share Plan 2020 | Minimum                            
Employment, Post-Employment Benefits and Share Compensation Plans                            
Exercise period for share-based payments                     4 years      
Assumed fluctuation of share price, share units granted           0.00%     0.00%          
Restricted Share Awards | Restricted Share Plan 2020 | Maximum                            
Employment, Post-Employment Benefits and Share Compensation Plans                            
Exercise period for share-based payments                     5 years      
Assumed fluctuation of share price, share units granted           5.00%     5.00%          
Share Performance Awards                            
Employment, Post-Employment Benefits and Share Compensation Plans                            
Number of subscription rights to shares | item                     2      
Number of shares to which one subscription right entitles                     1      
Share Performance Awards | Share Performance Plan 2017 and 2022                            
Employment, Post-Employment Benefits and Share Compensation Plans                            
Number of trading days for exercise of shares                     10 days      
Holding period for share-based payments                     4 years      
Threshold number of consecutive calendar years for achievement of targets | Y                     4      
Number of key performance indicators in share-based payments | item                     2      
Share Performance Awards | Share Performance Plan 2017                            
Employment, Post-Employment Benefits and Share Compensation Plans                            
Number of bearer shares that may be granted                     6,000,000      
Share Performance Awards | Share Performance Plan 2017 | Minimum                            
Employment, Post-Employment Benefits and Share Compensation Plans                            
Assumed fluctuation of share price, share units granted             0.00%     0.00%        
Share Performance Awards | Share Performance Plan 2017 | Maximum                            
Employment, Post-Employment Benefits and Share Compensation Plans                            
Assumed fluctuation of share price, share units granted             5.00%     5.00%        
Share Performance Awards | Share Performance Plan 2022                            
Employment, Post-Employment Benefits and Share Compensation Plans                            
Number of bearer shares that may be granted                     6,000,000      
Assumed fluctuation of share price, share units granted       5.00%                    
Share Performance Awards | Share Performance Plan 2022 | Minimum                            
Employment, Post-Employment Benefits and Share Compensation Plans                            
Assumed fluctuation of share price, share units granted 0.00% 0.00%                        
Share Performance Awards | Share Performance Plan 2022 | Maximum                            
Employment, Post-Employment Benefits and Share Compensation Plans                            
Assumed fluctuation of share price, share units granted 5.00% 5.00%                        
Restricted Share Units                            
Employment, Post-Employment Benefits and Share Compensation Plans                            
Number of share units granted | EquityInstruments                     1,105,000 592,000 603,000  
Restricted Share Units | U.S. Restricted Share Unit Plan                            
Employment, Post-Employment Benefits and Share Compensation Plans                            
Number of ordinary shares represented by each ADS                           0.5
Number of share units granted | EquityInstruments                     591,829      
Fair value of share units granted | $                     € 7.07      
Assumed fluctuation of share price, share units granted                     5.00%