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Balances under contracts with customers and other - Narrative (Details) € in Millions	12 Months Ended
	Dec. 31, 2024 EUR (€) year	Dec. 31, 2023 EUR (€) year	Dec. 31, 2022 EUR (€)
Balances under contracts with customers and other IFRS15 disclosures [Line Items]
Revenue from contracts with customers | €	€ 9,024.0	€ 8,339.0	€ 7,385.0
Percentage of revenue from contracts with customers over total revenue	98.70%	97.90%	97.80%
Construction division [Member]
Balances under contracts with customers and other IFRS15 disclosures [Line Items]
Revenue from contracts with customers | €	€ 7,091.0	€ 6,909.0	€ 6,287.0
Number of contracts with customers in force | year	738	750
Energy infraestructure and Mobility [Member]
Balances under contracts with customers and other IFRS15 disclosures [Line Items]
Number of contracts with customers in force | year	138	198

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- Definition

Balances under contracts with customers and other IFRS15 disclosures

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No definition available.

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Number of contracts with customers in force

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Percentage of revenue from contracts with customers over total revenue

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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.

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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

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