v3.25.4
Employee benefit plans - Defined benefit pension plans (Details)
€ in Thousands
12 Months Ended
Dec. 31, 2025
EUR (€)
plan
Dec. 31, 2024
EUR (€)
Dec. 31, 2023
EUR (€)
Employee benefit plans      
Number of defined benefit plans | plan 5    
Defined benefit liability (asset) € 590,684 € 692,638  
United States, France and Germany      
Employee benefit plans      
Defined benefit liability (asset) 554,730 657,239  
United States, France and Germany | Benefit obligation      
Employee benefit plans      
Defined benefit liability (asset) 818,337 917,071 € 890,025
United States      
Employee benefit plans      
Defined benefit liability (asset) € 40,650 83,148  
United States | Funded plan      
Employee benefit plans      
Number of defined benefit plans | plan 1    
United States | Funded plan | Benefit obligation      
Employee benefit plans      
Defined benefit liability (asset) € 304,184 338,757  
United States | Funded plan | FMCH      
Employee benefit plans      
Company contribution to plan 54,955    
Expected funding for next fiscal year 6,106    
Germany      
Employee benefit plans      
Defined benefit liability (asset) € 498,282 557,185  
Germany | Unfunded plan      
Employee benefit plans      
Number of defined benefit plans | plan 1    
Germany | Unfunded plan | Benefit obligation      
Employee benefit plans      
Defined benefit liability (asset) € 498,282 557,185  
Germany | Unfunded plan | Benefit obligation | Former board members of Management AG and active board members which were appointed before January 1, 2019      
Employee benefit plans      
Defined benefit liability (asset) 55,434 60,381  
Germany | Plan covered by insurance contracts      
Employee benefit plans      
Company contribution to plan 792    
Germany | Plan covered by insurance contracts | Benefit obligation      
Employee benefit plans      
Defined benefit liability (asset)   4,137  
Germany | Plan covered by insurance contracts | Benefit obligation | Active board members which were appointed after January 1, 2019      
Employee benefit plans      
Defined benefit liability (asset)   4,137  
France      
Employee benefit plans      
Defined benefit liability (asset) € 15,798 16,906  
France | Funded plan      
Employee benefit plans      
Number of defined benefit plans | plan 1    
France | Funded plan | Benefit obligation      
Employee benefit plans      
Defined benefit liability (asset) € 5,639 5,780  
France | Unfunded plan      
Employee benefit plans      
Number of defined benefit plans | plan 2    
France | Unfunded plan | Benefit obligation      
Employee benefit plans      
Defined benefit liability (asset) € 10,232 € 11,212