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Cash and cash equivalents and borrowings other borrowing table (Details) - Exinfrastructure project [Member] - EUR (€)
€ in Millions
Dec. 31, 2027
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2018
Corporate debt [Member]        
Corporate debt and other borrowings [Line Items]        
Credit limit   € 3,377.0 € 4,041.0  
Credit utilized   2,839.0 3,391.0  
Credit drawable   538.0 650.0  
Consolidated debt   2,852.0 3,386.0  
Corporate debt [Member] | Construction division [Member]        
Corporate debt and other borrowings [Line Items]        
Credit limit   131.0 163.0  
Credit utilized   17.0 26.0  
Credit drawable   114.0 137.0  
Consolidated debt   14.0 13.0  
Corporate debt [Member] | Airports division [Member]        
Corporate debt and other borrowings [Line Items]        
Credit limit   0.0 0.0  
Credit utilized   0.0 0.0  
Credit drawable   0.0 0.0  
Consolidated debt   14.0 31.0  
Other borrowings [Member]        
Corporate debt and other borrowings [Line Items]        
Credit limit   140.0 185.0  
Credit utilized   26.0 46.0  
Credit drawable   114.0 139.0  
Consolidated debt   36.0 63.0  
Corporate bonds and debentures [Member] | Corporate debt [Member]        
Corporate debt and other borrowings [Line Items]        
Credit limit   788.0   € 1.1
Credit utilized   250.0    
Consolidated debt € 60.0      
Corporate bonds and debentures [Member] | Other borrowings [Member]        
Corporate debt and other borrowings [Line Items]        
Credit limit   2,280.0 2,581.0  
Credit utilized   2,280.0 2,581.0  
Credit drawable   0.0 0.0  
Consolidated debt   2,292.0 2,590.0  
Syndicated facility [Member] | Other borrowings [Member]        
Corporate debt and other borrowings [Line Items]        
Credit limit   788.0 900.0  
Credit utilized   250.0 250.0  
Credit drawable     650.0  
Consolidated debt   252.0 236.0  
Euro commercial paper [Member] | Other borrowings [Member]        
Corporate debt and other borrowings [Line Items]        
Credit limit   249.0 500.0  
Credit utilized   249.0 500.0  
Credit drawable   0.0 0.0  
Consolidated debt   249.0 500.0  
Credit lines [Member] | Other borrowings [Member]        
Corporate debt and other borrowings [Line Items]        
Credit limit   60.0 60.0  
Credit utilized   60.0 60.0  
Credit drawable   0.0 0.0  
Consolidated debt   € 60.0 € 60.0