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Summary of significant accounting policies - Leases (Details)	12 Months Ended
	Dec. 31, 2023
Summary of significant accounting policies
Term of land use rights as operating lease (in years)	50 years
Terms of operating and finance leases (in years)	20 years

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- References

No definition available.

+ Details

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- Definition

Term of lessee's operating lease and finance lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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No definition available.

+ Details

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- Definition

Term of lessee's land use rights as operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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Period Type:	duration