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Administrative expenses (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 loss/(gain) on disposal of property, plant and equipment and right-of-use assets $ 0.6 $ (1.3) $ (0.4) $ (3.6)
Business combination costs 0.1 0.6 1.3 1.0
Impairment of goodwill       87.9
Net (reversal of impairment)/impairment of withholding tax receivables (24.9) 21.9 (37.8) 32.8
Other 13.1 1.8 21.7 8.1
Administrative expense        
Expense by nature        
Staff costs 41.2 43.6 131.8 126.0
Net loss allowance/(reversal of loss allowance) on trade receivables 11.8 (4.3) 13.6 (2.1)
Professional fees 10.8 11.0 32.1 38.1
Facilities, short term rental and upkeep 8.4 7.0 24.9 23.6
Travel costs 2.9 2.4 8.4 8.4
Depreciation 2.3 2.6 7.2 8.0
Amortization 0.8 4.1 2.5 6.2
Net loss/(gain) on disposal of property, plant and equipment and right-of-use assets 0.6 (1.3) (0.4) (3.6)
Operating taxes 0.1 0.4 0.7 1.1
Business combination costs 0.1 0.6 1.3 1.0
Impairment of goodwill       87.9
Net (reversal of impairment)/impairment of withholding tax receivables (24.9) 21.9 (37.8) 32.8
Other 4.2 4.8 14.8 18.1
Total $ 58.3 $ 92.8 $ 199.1 $ 345.5