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Personnel expenses and employee information - Bonus Expenses (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Bonus Expenses [Line Items]      
Total STI bonus expenses € 958.3 € 823.1 € 718.6
Board of Management      
Bonus Expenses [Line Items]      
Total STI bonus expenses 7.3 5.3 6.0
Former Board of Management      
Bonus Expenses [Line Items]      
Total STI bonus expenses 0.0 1.0 0.0
Other employees      
Bonus Expenses [Line Items]      
Total STI bonus expenses € 951.0 € 816.8 € 712.6