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Cost of sales (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Expense by nature        
Net impairment of property, plant and equipment, intangible assets excluding goodwill and related prepaid land rent $ 1.8 $ 1.2 $ 5.4 $ 10.1
Impairment of assets held for sale   2.9   2.9
Cost of sales        
Expense by nature        
Power generation 91.0 84.3 258.4 263.8
Depreciation 75.4 75.4 226.9 223.1
Amortization 26.5 9.2 46.8 28.8
Tower repairs and maintenance 16.2 13.0 43.3 37.5
Staff costs 8.1 5.8 23.3 18.6
Regulatory fees 6.2 (2.8) 20.0 11.7
Security services 6.0 5.2 16.7 13.1
Travel costs 2.1 0.7 4.9 4.0
Net impairment of property, plant and equipment, intangible assets excluding goodwill and related prepaid land rent 1.8 1.2 5.4 10.1
Insurance 0.8 1.1 2.5 3.5
Short-term rental 0.5 2.4 1.9 6.1
Vehicle maintenance and repairs 0.5 0.5 1.5 1.4
Professional fees 0.5 0.5 1.1 1.3
Impairment of assets held for sale   2.9   2.9
Other 3.4 2.3 11.0 36.8
Total 239.0 $ 201.7 663.7 662.7
Accelerated amortization expense on customer related intangible assets due to customer insolvency proceedings $ 13.8   $ 13.8  
Foreign exchange gains (losses)       $ (30.4)