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Remuneration of the board of directors and senior management - Narrative (Details) - EUR (€)
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Detail information about remuneration of the board of directors and senior management [Line Items]      
Basis of a certain percentage of the total monetary compensation of each senior manager. € 2,391,000 € 2,076,000  
Basis of a certain percentage of the total monetary compensation of each executive director 582,000 527,000  
Remuneration in kind relating to a company car     € 8,000
Directors' remuneration expense 1,900,000 1,900,000  
Senior management remuneration [Member] | Pension defined benefit plans [member]      
Detail information about remuneration of the board of directors and senior management [Line Items]      
Remuneration paid in the form of a premium under a group insurance policy 137,000 71,000  
Directors remuneration for holding office [Member]      
Detail information about remuneration of the board of directors and senior management [Line Items]      
Post-employment benefit expense, defined contribution plans 0    
Directors remuneration for holding office [Member] | Ferrovial SE [Member]      
Detail information about remuneration of the board of directors and senior management [Line Items]      
Maximum annual amount of directors remuneration   1,900,000  
Directors remuneration for holding office [Member] | Insurance policies covering death [Member]      
Detail information about remuneration of the board of directors and senior management [Line Items]      
Life insurance premiums for executive directors 18,000 15,000  
Directors remuneration for holding office [Member] | Third party liability insurance [Member]      
Detail information about remuneration of the board of directors and senior management [Line Items]      
Premium paid to policy covering the directors and managers of the group companies € 1,757,000 € 1,073,000