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Personnel expenses business (Details) - EUR (€) | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Disclosure of detailed information about the average workforce by business division [Line Items] |  |  |
Average number of employees | 25,857 | 25,166 | 34,351
Percentage of variation average number of employee | 3.00% | (27.00%) |
Men [Member] |  |  |
Disclosure of detailed information about the average workforce by business division [Line Items] |  |  |
Average number of employees | 21,333 | 20,855 | 27,029
Women [Member] |  |  |
Disclosure of detailed information about the average workforce by business division [Line Items] |  |  |
Average number of employees | 4,523 | 4,311 | 7,322
Construction division [Member] |  |  |
Disclosure of detailed information about the average workforce by business division [Line Items] |  |  |
Average number of employees | 18,299 | 19,412 | 18,451
Percentage of variation average number of employee | (6.00%) | 5.00% |
Construction division [Member] | Men [Member] |  |  |
Disclosure of detailed information about the average workforce by business division [Line Items] |  |  |
Average number of employees | 14,944 | 16,067 | 15,316
Construction division [Member] | Women [Member] |  |  |
Disclosure of detailed information about the average workforce by business division [Line Items] |  |  |
Average number of employees | 3,355 | 3,345 | 3,135
Toll roads division [Member] |  |  |
Disclosure of detailed information about the average workforce by business division [Line Items] |  |  |
Average number of employees | 815 | 911 | 541
Percentage of variation average number of employee | (11.00%) | 68.00% |
Toll roads division [Member] | Men [Member] |  |  |
Disclosure of detailed information about the average workforce by business division [Line Items] |  |  |
Average number of employees | 588 | 678 | 373
Toll roads division [Member] | Women [Member] |  |  |
Disclosure of detailed information about the average workforce by business division [Line Items] |  |  |
Average number of employees | 227 | 233 | 169
Airports division [Member] |  |  |
Disclosure of detailed information about the average workforce by business division [Line Items] |  |  |
Average number of employees | 248 | 237 | 235
Percentage of variation average number of employee | 5.00% | 1.00% |
Airports division [Member] | Men [Member] |  |  |
Disclosure of detailed information about the average workforce by business division [Line Items] |  |  |
Average number of employees | 201 | 195 | 192
Airports division [Member] | Women [Member] |  |  |
Disclosure of detailed information about the average workforce by business division [Line Items] |  |  |
Average number of employees | 46 | 42 | 43
Energy and mobility infrastructure division [Member] |  |  |
Disclosure of detailed information about the average workforce by business division [Line Items] |  |  |
Average number of employees | 1,661 | 69 | 23
Percentage of variation average number of employee | 2296.00% | 202.00% |
Energy and mobility infrastructure division [Member] | Men [Member] |  |  |
Disclosure of detailed information about the average workforce by business division [Line Items] |  |  |
Average number of employees | 1,460 | 48 | 17
Energy and mobility infrastructure division [Member] | Women [Member] |  |  |
Disclosure of detailed information about the average workforce by business division [Line Items] |  |  |
Average number of employees | 201 | 21 | 6
Others [Member] |  |  |
Disclosure of detailed information about the average workforce by business division [Line Items] |  |  |
Average number of employees | 4,834 | 4,536 | 4,402
Percentage of variation average number of employee | 7.00% | 3.00% |
Others [Member] | Men [Member] |  |  |
Disclosure of detailed information about the average workforce by business division [Line Items] |  |  |
Average number of employees | 4,140 | 3,866 | 3,785
Others [Member] | Women [Member] |  |  |
Disclosure of detailed information about the average workforce by business division [Line Items] |  |  |
Average number of employees | 694 | 670 | 617
Continuining operations of the company [Member] |  |  |
Disclosure of detailed information about the average workforce by business division [Line Items] |  |  |
Average number of employees |  |  | 23,653
Continuining operations of the company [Member] | Men [Member] |  |  |
Disclosure of detailed information about the average workforce by business division [Line Items] |  |  |
Average number of employees |  |  | 19,683
Continuining operations of the company [Member] | Women [Member] |  |  |
Disclosure of detailed information about the average workforce by business division [Line Items] |  |  |
Average number of employees |  |  | 3,970
Discontinued operations of the company [Member] |  |  |
Disclosure of detailed information about the average workforce by business division [Line Items] |  |  |
Average number of employees |  |  | 10,698
Discontinued operations of the company [Member] | Men [Member] |  |  |
Disclosure of detailed information about the average workforce by business division [Line Items] |  |  |
Average number of employees |  |  | 7,346
Discontinued operations of the company [Member] | Women [Member] |  |  |
Disclosure of detailed information about the average workforce by business division [Line Items] |  |  |
Average number of employees |  |  | 3,352

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