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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 |

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