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Business Combinations - Summary of Reconciliation of Goodwill (Details)
€ in Thousands
12 Months Ended
Dec. 31, 2020
EUR (€)
Disclosure Of Business Combinations [Abstract]  
As of January 1, 2020 € 2,978
Acquisition of subsidiaries and businesses 57,469
Currency differences (6,750)
As of December 31, 2020 € 53,697