v3.26.3
Cost of sales (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Expense by nature        
Impairment of assets held for sale $ 0.0   $ 75.4 $ 0.0
Cost of sales        
Expense by nature        
Power generation 129.6 $ 89.3 335.0 254.7
Depreciation 47.9 45.1 146.9 139.8
Amortization 4.8 6.4 14.4 15.2
Tower repairs and maintenance 16.0 13.5 44.2 35.8
Staff costs 7.5 6.5 22.7 19.1
Regulatory fees 6.2 6.2 20.0 20.0
Security services 6.3 5.6 17.5 15.6
Travel costs 2.3 2.1 6.2 4.8
Net impairment of property, plant and equipment, intangible assets excluding goodwill and related prepaid land rent 2.1 1.6 5.9 3.4
Insurance 0.7 0.8 2.0 2.3
Short-term rental 1.2 1.2 3.6 4.1
Vehicle maintenance and repairs 0.5 0.5 1.4 1.5
Professional fees 0.3 0.5 1.1 1.0
Other 5.0 2.9 14.5 9.8
Total $ 230.4 $ 182.2 $ 635.4 $ 527.1