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Property, plant, and equipment - Additional Information (Details) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Property, Plant and Equipment      
Increase in net value of property, plant and equipment € 3.9    
Acquisitions     € 0.7
Fibroscan machines      
Property, Plant and Equipment      
Acquisitions € 3.7    
Additions to right-of-use assets   € 5.1  
Technical facilities, equipment and tooling      
Property, Plant and Equipment      
Acquisitions     0.3
Other property, plant and equipment      
Property, Plant and Equipment      
Acquisitions     € 0.2