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Accounting policies (Tables)
 12 Months Ended
Dec. 31, 2024
Significant Accounting Policies [Abstract]  
Summary of Intangible Asset Useful Economic Life
Amortization is provided at rates calculated to write off the valuation of each asset over its expected useful life, as follows:
Intangible AssetAmortization methodUseful economic life
Customer databasesDiminishing balance method
2-5 years
BrandsStraight-line method
Assessed separately for each asset, with lives ranging up to 20 years
Marketing and data analytics know-howStraight-line method
4-5 years
LicensesStraight-line method
1-10 years
Exclusive license rightsStraight-line method
3 years
Acquired technologyStraight-line method
2-10 years
Internally-generated software development costsStraight-line method
2-10 years
Summary of Property, Plant and Equipment Useful Economic Life
Property, plant and equipment is stated at historical cost less accumulated depreciation and any accumulated impairment losses.
Property plant and equipmentDepreciation methodUseful economic life
Leasehold property improvementsStraight-lineOver the life of the lease or the useful life of the asset, whichever is shorter
Furniture and fittingsStraight-line
3-6 years
Office equipmentStraight-line
3-10 years
Computer hardware and softwareStraight-line
2-5 years straight-line