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Revenue from Contracts with Customers - Summary of Revenue Recognized (Details) - EUR (€)
€ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure Of Revenue From Contracts With Customers [Abstract]      
Amounts included in contract liabilities at the beginning of the year € 58,895 € 84,112 € 59,583