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Revenue from Contracts with Customers - Summary of Contract Liabilities Allocated to Remaining Performance Obligations (Unsatisfied or Partially Unsatisfied) (Details) - EUR (€)
€ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Disclosure Of Performance Obligations [Line Items]    
Contract liabilities € 371,475 € 190,692
Unsatisfied Or Partially Unsatisfied    
Disclosure Of Performance Obligations [Line Items]    
Contract liabilities 371,475 190,692
Within One Year | Unsatisfied Or Partially Unsatisfied    
Disclosure Of Performance Obligations [Line Items]    
Contract liabilities 299,583 93,583
More Than One Year | Unsatisfied Or Partially Unsatisfied    
Disclosure Of Performance Obligations [Line Items]    
Contract liabilities € 71,892 € 97,109