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Cash and cash equivalents and borrowings and other borrowings (Details) - EUR (€) € in Thousands | Dec. 31, 2024 | Dec. 31, 2023
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Corporate debt ex infrastructure project [Line Items] |  |
Notional amount | € 6,438,000 | € 4,990
Exinfrastructure project [Member] |  |
Corporate debt ex infrastructure project [Line Items] |  |
Notional amount | € 2,865,000 | € 3,437,000
Exinfrastructure project [Member] | 13 September 2030 [Member] |  |
Corporate debt ex infrastructure project [Line Items] |  |
Borrowings, interest rate | 4.375% |
Exinfrastructure project [Member] | 31 March 2025 [Member] |  |
Corporate debt ex infrastructure project [Line Items] |  |
Borrowings, interest rate | 1.375% |
Exinfrastructure project [Member] | 14 May 2026 [Member] |  |
Corporate debt ex infrastructure project [Line Items] |  |
Borrowings, interest rate | 1.38% |
Exinfrastructure project [Member] | 12 November 2028 [Member] |  |
Corporate debt ex infrastructure project [Line Items] |  |
Borrowings, interest rate | 0.54% |
Exinfrastructure project [Member] | 13 September 2023 |  |
Corporate debt ex infrastructure project [Line Items] |  |
Notional amount | € 500,000 |
Exinfrastructure project [Member] | 29 March 2017 |  |
Corporate debt ex infrastructure project [Line Items] |  |
Notional amount | 500,000 |
Exinfrastructure project [Member] | 14 May 2020 |  |
Corporate debt ex infrastructure project [Line Items] |  |
Notional amount | 780,000 |
Exinfrastructure project [Member] | 12 November 2020 |  |
Corporate debt ex infrastructure project [Line Items] |  |
Notional amount | € 500,000 |

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