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Events after the reporting period (Details) $ in Millions |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Oct. 09, 2025 | Mar. 31, 2025 item | Sep. 30, 2025 USD ($) | Sep. 30, 2024 USD ($) | Sep. 30, 2025 USD ($) | Sep. 30, 2024 USD ($) | Oct. 08, 2025 | May 20, 2025 USD ($)
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |  |  |  |  |
Repayments of borrowings, classified as financing activities |  |  | $ 19.9 | $ 59.2 | $ 368.8 | $ 465.8 |  |
Number of towers converted from right-of-use assets to property, plant and equipment through business combination | item |  | 1,562 |  |  |  |  |  |
Number of tower related land assets converted from right-of-use assets to property, plant and equipment through business combination | item |  | 187 |  |  |  |  |  |
IHS Rwanda Limited |  |  |  |  |  |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |  |  |  |  |
Percentage of ownership interests in subsidiary to be disposed |  |  |  |  |  |  |  | 100.00%
Between one and two years | IHS Rwanda Limited |  |  |  |  |  |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |  |  |  |  |
Agreed deferred consideration for sale of subsidiary |  |  |  |  |  |  |  | $ 70.0
Between two and three years | IHS Rwanda Limited |  |  |  |  |  |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |  |  |  |  |
Agreed deferred consideration for sale of subsidiary |  |  |  |  |  |  |  | 24.5
Maximum | IHS Rwanda Limited |  |  |  |  |  |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |  |  |  |  |
Agreed consideration for sale of subsidiary |  |  |  |  |  |  |  | 274.5
Agreed performance related earn out consideration from sale of subsidiary |  |  |  |  |  |  |  | $ 5.0
Disposal of major subsidiary | IHS Rwanda Limited |  |  |  |  |  |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |  |  |  |  |
Percentage of ownership interests in subsidiary sold | 100.00% |  |  |  |  |  |  |
Number of sites sold as part of sale of subsidiary | 1,467 |  |  |  |  |  |  |
Site agreement with Tim S.A. | Maximum | BRAZIL |  |  |  |  |  |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |  |  |  |  |
Number of sites to be built over duration of agreement |  |  |  |  |  |  | 3,000 |
Site agreement with Tim S.A. | Minimum | BRAZIL |  |  |  |  |  |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |  |  |  |  |
Number of sites for initial deployment in agreement |  |  |  |  |  |  | 500 |

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