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Financial Assets and Financial Liabilities - Summary of Changes in Liabilities Arising From Financing Activities (Details) - EUR (€)
€ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure Of Reconciliation Of Liabilities Arising From Financing Activities [Line Items]    
Beginning balance € 74,211 € 56,352
Cash flows 141,718 7,939
Acquisition of subsidiaries and businesses 35,050  
New leases and disposals 4,240 9,920
Other 15,873  
Ending balance 271,092 74,211
Current Obligations under Lease Contracts    
Disclosure Of Reconciliation Of Liabilities Arising From Financing Activities [Line Items]    
Beginning balance 3,485 2,134
Cash flows (12,743) (3,061)
Acquisition of subsidiaries and businesses 2,719  
New leases and disposals 8,684 1,484
Reclassification 3,982 2,928
Ending balance 6,127 3,485
Non-current Obligations under Lease Contracts    
Disclosure Of Reconciliation Of Liabilities Arising From Financing Activities [Line Items]    
Beginning balance 54,126 48,618
Acquisition of subsidiaries and businesses 32,331  
New leases and disposals (4,444) 8,436
Reclassification (3,982) (2,928)
Ending balance 78,031 54,126
Interest-bearing Loans and Borrowings    
Disclosure Of Reconciliation Of Liabilities Arising From Financing Activities [Line Items]    
Beginning balance 16,600 5,600
Cash flows 140,847 11,000
Other (1,416)  
Ending balance 156,031 € 16,600
Convertible Note - Embedded Derivative    
Disclosure Of Reconciliation Of Liabilities Arising From Financing Activities [Line Items]    
Cash flows 13,614  
Other 17,289  
Ending balance € 30,903