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Income taxes - Summary of tax loss carryforwards that are not recognized as deferred tax assets (Details) - EUR (€)
€ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Tax loss carryforwards that are not recognized as deferred tax assets    
Tax loss carry-forward € 2,601,313 € 2,696,010
Unlimited    
Tax loss carryforwards that are not recognized as deferred tax assets    
Tax loss carry-forward 105,143 102,450
will expire within 5 years    
Tax loss carryforwards that are not recognized as deferred tax assets    
Tax loss carry-forward 2,470,875 18,508
will expire thereafter    
Tax loss carryforwards that are not recognized as deferred tax assets    
Tax loss carry-forward € 25,295 € 2,575,052