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Financial Assets and Financial Liabilities - Summary of Cash and Cash Equivalents (Details) - EUR (€)
€ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Cash And Cash Equivalents [Abstract]        
Cash and cash equivalents € 1,210,209 € 519,149 € 411,495 € 172,106
Total € 1,210,209 € 519,149 € 411,495 € 172,106