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Leases - Additional Information (Details) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure Of Quantitative Information About Rightofuse Assets [Line Items]      
Additions to right-of-use assets € 22.1 € 10.0  
Advance payments related to embedded leases 10.8    
Total cash outflow for leases 14.7 € 4.8 € 2.3
Maximum      
Disclosure Of Quantitative Information About Rightofuse Assets [Line Items]      
Undiscounted potential future lease payments related to renewal options not included in lease liabilities until 2049 38.3    
Within One Year      
Disclosure Of Quantitative Information About Rightofuse Assets [Line Items]      
Future lease payments for non-cancellable lease contracts 2.8    
More Than One Year      
Disclosure Of Quantitative Information About Rightofuse Assets [Line Items]      
Future lease payments for non-cancellable lease contracts € 10.2