Significant accounting judgments, estimates and assumptions - Additional Information (Details) ¥ in Millions, $ in Millions	12 Months Ended
Dec. 31, 2024 CNY (¥)	Dec. 31, 2024 USD ($)	Dec. 31, 2023 CNY (¥)	Dec. 31, 2022 CNY (¥)
Significant accounting judgments, estimates and assumptions
Gain loss from asset transfer	¥ 0.9
Excess incentive amount reclassified to selling expenses	¥ 75.2	$ 10.3	¥ 224.5	¥ 140.8

The gain (loss) that both: (a) relates to identifiable assets acquired or liabilities assumed in a business combination; and (b) is of such size, nature or incidence that disclosure is relevant to understanding the combined entity's financial statements. [Refer: Total for all business combinations [member]]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 3
-IssueDate 2024-01-01
-Paragraph B67
-Subparagraph e
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2024-en-r&anchor=para_B67_e&doctype=Appendix&subtype=B
-URIDate 2024-03-27

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration