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Balances under contracts with customers and other ifrs 15 disclosures (Details) - EUR (€) € in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenue from contracts with customers | € 9,024.0 | € 8,339.0 | € 7,385.0
Construction division [Member] |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenue from contracts with customers | 7,091.0 | 6,909.0 | 6,287.0
Toll roads division [Member] |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenue from contracts with customers | 1,236.0 | 1,071.0 | 765.0
Airports division [Member] |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenue from contracts with customers | 90.0 | 8.0 | 5.0
Corporation division [Member] |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenue from contracts with customers | 607.0 | 351.0 | 328.0
Completed work pending certification [Member] |  |  |
Customer contract assets liabilities [Line Items] |  |  |
Total customer contract balances | 573.0 | 446.0 | 406.0
Increase decrease in customer contract balances exchange rate | 10.0 | 2.0 |
Increase decrease in customer contract balances consolidation scope changes | 0.0 | 0.0 |
Increase decrease in customer contract balances other | 118.0 | 38.0 |
Retentions member [Member] |  |  |
Customer contract assets liabilities [Line Items] |  |  |
Total customer contract balances | 191.0 | 160.0 | 141.0
Increase decrease in customer contract balances exchange rate | 3.0 | 1.0 |
Increase decrease in customer contract balances consolidation scope changes | 0.0 | 0.0 |
Increase decrease in customer contract balances other | 28.0 | 18.0 |
Total customer contract assets [Member] |  |  |
Customer contract assets liabilities [Line Items] |  |  |
Total customer contract balances | 764.0 | 606.0 | 547.0
Increase decrease in customer contract balances exchange rate | 13.0 | 3.0 |
Increase decrease in customer contract balances consolidation scope changes | 0.0 | 0.0 |
Increase decrease in customer contract balances other | 146.0 | 56.0 |
Work certified in advance [Member] |  |  |
Customer contract assets liabilities [Line Items] |  |  |
Total customer contract balances | 1,227.0 | 1,124.0 | 962.0
Increase decrease in customer contract balances exchange rate | 26.0 | (3.0) |
Increase decrease in customer contract balances consolidation scope changes | 0.0 | 0.0 |
Increase decrease in customer contract balances other | 77.0 | 165.0 |
Advance payments [Member] |  |  |
Customer contract assets liabilities [Line Items] |  |  |
Total customer contract balances | 392.0 | 406.0 | 402.0
Increase decrease in customer contract balances exchange rate | 1.0 | 5.0 |
Increase decrease in customer contract balances consolidation scope changes | 0.0 | 0.0 |
Increase decrease in customer contract balances other | (14.0) | (1.0) |
Total customer contract liabilities [Member] |  |  |
Customer contract assets liabilities [Line Items] |  |  |
Total customer contract balances | 1,619.0 | 1,530.0 | € 1,364.0
Increase decrease in customer contract balances exchange rate | 27.0 | 2.0 |
Increase decrease in customer contract balances consolidation scope changes | 0.0 | 0.0 |
Increase decrease in customer contract balances other | € 63.0 | € 164.0 |

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- Definition The amount of revenue from contracts with customers. A customer is a party that has contracted with an entity to obtain goods or services that are an output of the entity’s ordinary activities in exchange for consideration. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 15 -IssueDate 2024-01-01 -Paragraph 114 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2024-en-r&anchor=para_114&doctype=Standard -URIDate 2024-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 15 -IssueDate 2024-01-01 -Paragraph 113 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2024-en-r&anchor=para_113_a&doctype=Standard -URIDate 2024-03-27 + Details
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