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Financial risk management - Aging of Debtors (Details) - EUR (€)
€ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Financial risk management      
Financial assets € 5,847,242 € 1,316,539 € 1,181,545
60 - 90 days | Trade receivables | Credit risk      
Financial risk management      
Financial assets 87 236  
90 - 120 days | Trade receivables | Credit risk      
Financial risk management      
Financial assets   12 1
more than 120 days | Trade receivables | Credit risk      
Financial risk management      
Financial assets € 0 € 0 € 0