v3.26.1
Employee benefits - Schedule of main actuarial assumptions used (Details) - Defined-benefit plans
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Italy    
Employee benefits    
Salary increase rate   2.50%
Italy | Maximum    
Employee benefits    
Average duration of plan (years) 15 years 9 months 3 days 17 years 6 months 10 days
Discount rate 3.98% 3.41%
Inflation rate 2.18% 2.21%
Salary increase rate 2.50%  
Italy | Minimum    
Employee benefits    
Average duration of plan (years) 15 years 6 months 7 years 9 months 18 days
Discount rate 2.36% 2.57%
Inflation rate 1.61% 1.84%
Salary increase rate 0.50%  
Austria | Maximum    
Employee benefits    
Average duration of plan (years) 11 years 3 months 18 days 11 years
Discount rate 4.06% 3.45%
Salary increase rate 3.00% 3.00%
Austria | Minimum    
Employee benefits    
Average duration of plan (years) 8 years 3 months 18 days 7 years 4 months 24 days
Discount rate 3.88% 3.25%
Salary increase rate 1.70% 1.70%