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Other income and expenses - LPC GmbH (Details) - EUR (€)
€ in Thousands
6 Months Ended
Jun. 30, 2020
Jun. 30, 2021
Dec. 31, 2020
Other income and expenses      
Noncontrolling interests   € 141 € 95
LPC GmbH      
Other income and expenses      
Proportion of ownership interest in subsidiary 51.00%    
Consideration for disposal of subsidiary € 213    
Consideration to be received over time € 200    
Payment due period (in years) 4 years    
Noncontrolling interests € (268)    
Profit/(loss) allocated to non-controlling interest € (101)