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Employee benefits - Summary of Defined Benefit Obligation and Plan Assets (Parenthetical) (Details) - EUR (€)
€ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Disclosure of net defined benefit liability (asset)    
Defined benefit obligation € 14,129 € 10,412
Switzerland    
Disclosure of net defined benefit liability (asset)    
Defined benefit obligation 13,300 9,700
Austria    
Disclosure of net defined benefit liability (asset)    
Defined benefit obligation 400 400
Slovenia    
Disclosure of net defined benefit liability (asset)    
Defined benefit obligation 300 200
Philippines    
Disclosure of net defined benefit liability (asset)    
Defined benefit obligation € 200 € 100