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Financial risk management objectives and policies (Details)
€ in Thousands, $ in Millions
1 Months Ended 12 Months Ended
Dec. 31, 2020
EUR (€)
Dec. 31, 2020
USD ($)
Dec. 31, 2020
EUR (€)
Dec. 31, 2019
EUR (€)
Dec. 31, 2018
EUR (€)
Disclosure of detailed information about financial instruments [line items]          
Offset trade receivables and payables € 902   € 902 € 1,802  
Proceeds from issuing shares 194,300 $ 231.4 203,006 329,161 € 215,985
Trade notes and accounts receivable          
Disclosure of detailed information about financial instruments [line items]          
Financial assets 6,651   6,651 9,497  
Trade notes and accounts receivable | Cost          
Disclosure of detailed information about financial instruments [line items]          
Financial assets 14,712   14,712 17,780  
Trade notes and accounts receivable | Accumulated impairment          
Disclosure of detailed information about financial instruments [line items]          
Financial assets (8,061)   (8,061) (8,283) (4,254)
Other receivables | Cost          
Disclosure of detailed information about financial instruments [line items]          
Financial assets 3,406   3,406 4,728  
Other receivables | Accumulated impairment          
Disclosure of detailed information about financial instruments [line items]          
Financial assets € (589)   € (589) € (503) € (484)