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Income Tax - Additional Information (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Corporate tax rate (as a percent) 15.00%    
Solidarity surcharge rate (as a percent) 5.50%    
Statutory tax rate (as a percent) 27.10% 27.20% 30.70%
Tax rate for deferred taxes (as a percent) 27.10%    
State income tax with average rate (as a percent) 21.60% 27.20% 31.60%
Deferred tax assets settlement € 17.8    
Non cash current tax relating to items credited (charged) directly to equity 19.8    
Deferred tax assets 81.3 € 229.6  
Deferred tax (assets) and liabilities, net recognized 41.6 223.4 € (66.7)
Federal tax losses   128.9  
State tax losses   128.9  
Deferred tax liabilities have not been recognized 2.8    
Deductible Temporary Differences, Unused Tax Losses, And Unused Tax Credits      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets 531.5    
Tax losses      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax (assets) and liabilities, net recognized 31.9    
Tax losses / tax credits      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax (assets) and liabilities, net recognized € 2.8    
Austria      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Corporate tax rate (as a percent) 24.00%    
Decrease in corporate tax rate (as a percent) 23.00%    
United States      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Federal corporate income tax (as a percent) 21.00%    
State income tax with average rate (as a percent) 4.50%    
Valuation adjustment      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax (assets) and liabilities, net recognized € (138.0) € (136.7) € (81.0)
Chief Executive Officer Grant      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax (assets) and liabilities, net recognized € 108.8