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Income tax - Schedule of unused tax losses carried forward (Details) - EUR (€)
€ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Income tax      
Unused tax losses for corporate income tax € 1,700,475 € 1,427,735 € 1,180,227
Unused tax losses for trade tax 1,685,517 1,419,217 1,175,846
Unused interest carryforward ("Zinsschranke")     2,879
Deferred tax assets, temporary differences 20,900 21,800  
Temporary differences valuation of deferred tax assets 0 0 € 0
Current tax assets € 5,201 € 285