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Critical accounting estimates and judgments - Key assumptions to fair value less costs of disposals calculation (Details) - I-Systems | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2025 | Dec. 31, 2024
Disclosure of intangible assets material to entity [line items] |  |
Discount rate | 10.40% | 9.40%
Terminal growth rate | 4.60% | 4.70%
Forecast period for calculation of fair value less costs of disposal | 10 years |
Minimum |  |
Disclosure of intangible assets material to entity [line items] |  |
Homes connected | 600,000 | 700,000
Maximum |  |
Disclosure of intangible assets material to entity [line items] |  |
Homes connected | 1,800,000 | 3,100,000

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- Definition The discount rate used in the current measurement of fair value less costs of disposal. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2024-01-01 -Paragraph 130 -Subparagraph f -Clause iii -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=36&code=ifrs-tx-2024-en-r&anchor=para_130_f_iii&doctype=Standard -URIDate 2024-03-27 + Details
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