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Segment reporting - Schedule of Non-Current Assets by Geography (Details) - EUR (€) € in Thousands | Dec. 31, 2025 | Dec. 31, 2024
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Disclosure of operating segments [line items] |  |
Total non-current assets (other than financial instruments and deferred tax assets) | € 1,441,952 | € 1,420,296
EMEA |  |
Disclosure of operating segments [line items] |  |
Total non-current assets (other than financial instruments and deferred tax assets) | 516,202 | 412,902
Italy |  |
Disclosure of operating segments [line items] |  |
Total non-current assets (other than financial instruments and deferred tax assets) | 302,941 | 236,496
Americas |  |
Disclosure of operating segments [line items] |  |
Total non-current assets (other than financial instruments and deferred tax assets) | 748,996 | 797,408
United States |  |
Disclosure of operating segments [line items] |  |
Total non-current assets (other than financial instruments and deferred tax assets) | 720,968 | 785,584
Greater China Region |  |
Disclosure of operating segments [line items] |  |
Total non-current assets (other than financial instruments and deferred tax assets) | 85,907 | 117,329
Rest of APAC |  |
Disclosure of operating segments [line items] |  |
Total non-current assets (other than financial instruments and deferred tax assets) | € 90,847 | € 92,657

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