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Defined benefit plans - Summary of actuarial assumptions (Details)	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Bottom of range [member]
Defined Benefit Plan Actuarial Assumptions [Line Items]
Discount rate	3.81%	3.45%
Future salary increase rate	1.94%	1.94%
Weighted average maturity	4.98	5.00
Top of range [member]
Defined Benefit Plan Actuarial Assumptions [Line Items]
Discount rate	4.93%	4.66%
Future salary increase rate	5.96%	5.94%
Weighted average maturity	10.04	11.00

X

- Definition

The discount rate used as the significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit obligation, at present value; Actuarial assumptions [domain]]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 19
-IssueDate 2025-01-01
-Paragraph 144
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2025-en-r&anchor=para_144&doctype=Standard
-URIDate 2025-03-27

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X

- Definition

The expected rate of salary increases used as a significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit plans [domain]; Defined benefit obligation, at present value; Actuarial assumptions [domain]]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 19
-IssueDate 2025-01-01
-Paragraph 144
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2025-en-r&anchor=para_144&doctype=Standard
-URIDate 2025-03-27

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X

- Definition

Defined Benefit Plan Actuarial assumption.

+ References

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- Definition

Weighted average maturity.

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