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Share capital - Classification (Details) - € / shares
Nov. 19, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of classes of share capital [line items]        
Share capital   20,000 20,000 20,000
Ordinary Shares        
Disclosure of classes of share capital [line items]        
Number of shares converted 20,000      
Share capital     0  
Share price € 1 € 1 € 1  
Class A shares        
Disclosure of classes of share capital [line items]        
Number of shares converted 19,040      
Share capital   18,940 19,040  
Share price € 1 € 1 € 1  
Class B shares        
Disclosure of classes of share capital [line items]        
Number of shares converted 960      
Share capital   1,060 960  
Share price € 1 € 1 € 1