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Intangible Assets - Summary of Detailed Information About Intangible Assets (Details) - EUR (€)
€ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure Of Intangible Assets [Line Items]    
Beginning Balance € 89,434 € 88,042
Ending Balance 163,490 89,434
Gross Carrying Amount    
Disclosure Of Intangible Assets [Line Items]    
Beginning Balance 121,693 103,883
Additions 8,613 13,273
Disposals (6,078) (610)
Currency differences (10,647) (23)
Acquisition of subsidiaries and businesses 93,314 5,170
Ending Balance 206,895 121,693
Cumulative Depreciation and Impairment Charges    
Disclosure Of Intangible Assets [Line Items]    
Beginning Balance (32,260) (15,842)
Amortization 16,627 16,502
Disposals 5,410 81
Currency differences (72) (3)
Ending Balance (43,405) (32,260)
Goodwill    
Disclosure Of Intangible Assets [Line Items]    
Beginning Balance 2,978 534
Ending Balance 53,697 2,978
Goodwill | Gross Carrying Amount    
Disclosure Of Intangible Assets [Line Items]    
Beginning Balance 2,978 534
Currency differences (6,750)  
Acquisition of subsidiaries and businesses 57,469 2,444
Ending Balance 53,697 2,978
Concessions, Licenses, in-process R&D and Similar Rights    
Disclosure Of Intangible Assets [Line Items]    
Beginning Balance 84,053 86,011
Ending Balance 103,841 84,053
Concessions, Licenses, in-process R&D and Similar Rights | Gross Carrying Amount    
Disclosure Of Intangible Assets [Line Items]    
Beginning Balance 116,313 101,853
Additions 4,187 11,744
Disposals (5,435) (133)
Reclassifications 233 146
Currency differences (3,897) (23)
Acquisition of subsidiaries and businesses 35,845 2,726
Ending Balance 147,246 116,313
Concessions, Licenses, in-process R&D and Similar Rights | Cumulative Depreciation and Impairment Charges    
Disclosure Of Intangible Assets [Line Items]    
Beginning Balance (32,260) (15,842)
Amortization 16,627 16,502
Disposals 5,410 81
Currency differences (72) (3)
Ending Balance (43,405) (32,260)
Advance Payments    
Disclosure Of Intangible Assets [Line Items]    
Beginning Balance 2,403 1,497
Ending Balance 5,953 2,403
Advance Payments | Gross Carrying Amount    
Disclosure Of Intangible Assets [Line Items]    
Beginning Balance 2,403 1,497
Additions 4,426 1,529
Disposals (643) (477)
Reclassifications (233) (146)
Ending Balance € 5,953 € 2,403