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v3.26.1

Employee benefits - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024
Italian leaving indemnities (TFR) |  |
Employee Benefits [Line Items] |  |
Weighted average duration of defined benefit obligation | 7 years 2 months 12 days | 7 years 10 months 24 days
Leaving indemnities | China |  |
Employee Benefits [Line Items] |  |
Weighted average duration of defined benefit obligation | 8 years 6 months | 9 years 8 months 12 days
Leaving indemnities | Spain |  |
Employee Benefits [Line Items] |  |
Weighted average duration of defined benefit obligation | 7 years 4 months 24 days | 10 years 2 months 12 days

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- Definition The weighted average duration of a defined benefit obligation. [Refer: Weighted average [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2025-01-01 -Paragraph 147 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2025-en-r&anchor=para_147_c&doctype=Standard -URIDate 2025-03-27 + Details
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- Definition Employee benefits. + References No definition available. + Details
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- Details
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- Details
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- Details
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