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Interests in equity-accounted investees - Summary of interests in associates and joint ventures (Details) - shares	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Direct beneficial interest (%) | Insighta
Disclosure of associates [line items]
Proportion of nominal value of issue capital held by the Company (%)		35.00%
Proportion of voting rights held in associate (%)		35.00%
Indirect beneficial interest (%) | Insighta
Disclosure of associates [line items]
Proportion of nominal value of issue capital held by the Company (%)		0.00%
Proportion of voting rights held in associate (%)		0.00%
Insighta
Disclosure of associates [line items]
Number of shares issued (in shares)	2,000,000
Proportion of nominal value of issue capital held by the Company (%)		35.00%
Proportion of voting rights held in associate (%)		35.00%
Insighta | Direct beneficial interest (%)
Disclosure of associates [line items]
Proportion of nominal value of issue capital held by the Company (%)	35.00%
Proportion of voting rights held in associate (%)	35.00%
Insighta | Indirect beneficial interest (%)
Disclosure of associates [line items]
Proportion of nominal value of issue capital held by the Company (%)	0.00%
Proportion of voting rights held in associate (%)	0.00%
CERBACT Asia Holdings Pte. Ltd. (“CERBACT”)
Disclosure of associates [line items]
Number of shares issued (in shares)	100
CERBACT Asia Holdings Pte. Ltd. (“CERBACT”) | Direct beneficial interest (%)
Disclosure of associates [line items]
Proportion of nominal value of issue capital held by the Company (%)	0.00%	0.00%
Proportion of voting rights held in associate (%)	0.00%	0.00%
CERBACT Asia Holdings Pte. Ltd. (“CERBACT”) | Indirect beneficial interest (%)
Disclosure of associates [line items]
Proportion of nominal value of issue capital held by the Company (%)	0.00%	26.04%
Proportion of voting rights held in associate (%)	0.00%	26.04%

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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

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- Definition

The proportion of the voting rights in an associate held by the entity. [Refer: Total for all associates [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 27
-IssueDate 2025-01-01
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-URIDate 2025-03-27

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Note Effective 2027-01-01
-Name IFRS
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-URIDate 2025-03-27

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Note Effective 2027-01-01
-Name IFRS
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