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Capital commitments and contingent liabilities (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
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Capital commitments and contingent liabilities. |  |
Commitments to purchase property, plant and equipment | $ 108.8 | $ 98.9

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- Definition The amount of contractual commitments for the acquisition of property, plant and equipment. [Refer: Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2024-01-01 -Paragraph 74 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=16&code=ifrs-tx-2024-en-r&anchor=para_74_c&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_ContractualCommitmentsForAcquisitionOfPropertyPlantAndEquipment
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition No definition available + References No definition available. + Details
Name: | ihs_CapitalCommitmentsAndContingentLiabilitiesAbstract
Namespace Prefix: | ihs_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration