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Investments in infrastructure projects - Narrative (Details) - EUR (€) € in Thousands | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Detail information investment in infrastructure projects [Line Items] |  |
Increase decrease in investments in infrastructure projects intangible asset model additions | € (154,000) | € 460,000
Increase decrease in investments in infrastructure projects intangible asset mode exchange rate | 812,000 | (376,000)
Cash flows due to intangible assets additions using the intangible asset model | (132,000) | (248,000)
Notional amount | 6,438,000 | 4,990
Airports division [Member] | Dalaman airport [Member] |  |
Detail information investment in infrastructure projects [Line Items] |  |
Notional amount | 592,000 | 617,000
I66 mobility partners [Member] |  |
Detail information investment in infrastructure projects [Line Items] |  |
Increase decrease in investments in infrastructure projects intangible asset model additions |  | 489,000
Notional amount | € 6,190,000 | 5,925,000
North tarrant express extension [Member] |  |
Detail information investment in infrastructure projects [Line Items] |  |
Increase decrease in investments in infrastructure projects intangible asset model additions |  | 178,000
Euroscut Azores toll road [Member] |  |
Detail information investment in infrastructure projects [Line Items] |  |
Increase decrease in investments in infrastructure projects intangible asset mode consolidation scope changes and transfers |  | € (255,000)

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