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Employee benefits - Summary of Main Assumptions for Quantitative Sensitivity Analysis (Detail) - EUR (€) | Dec. 31, 2025 | Dec. 31, 2024
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Discount rate |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |
Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption | € (0.0757) | € (0.0855)
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption | 0.0807 | 0.0916
Increase (decrease) in service cost due to reasonably possible increase in actuarial assumption | (0.0117) | (0.0141)
Increase (decrease) in service cost due to reasonably possible decrease in actuarial assumption | 0.0125 | 0.0153
Inflation rate |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |
Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption | 0.0687 | 0.0805
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption | (0.0652) | (0.0762)
Increase (decrease) in service cost due to reasonably possible increase in actuarial assumption | 0.0115 | 0.0147
Increase (decrease) in service cost due to reasonably possible decrease in actuarial assumption | (0.0108) | (0.0137)
Turn-over rate |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |
Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption | 0.2314 | 0.2684
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption | (0.4037) | (0.4075)
Increase (decrease) in service cost due to reasonably possible increase in actuarial assumption | 0.0345 | 0.0469
Increase (decrease) in service cost due to reasonably possible decrease in actuarial assumption | € (0.0655) | € (0.0735)

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- Definition The increase (decrease) in a defined benefit obligation that would have been caused by a decrease in a significant actuarial assumption that was reasonably possible at the end of the reporting period. [Refer: Actuarial assumptions [domain]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2025-01-01 -Paragraph 145 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2025-en-r&anchor=para_145_a&doctype=Standard -URIDate 2025-03-27 + Details
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- Definition The increase (decrease) in a defined benefit obligation that would have been caused by an increase in a significant actuarial assumption that was reasonably possible at the end of the reporting period. [Refer: Actuarial assumptions [domain]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2025-01-01 -Paragraph 145 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2025-en-r&anchor=para_145_a&doctype=Standard -URIDate 2025-03-27 + Details
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