v3.26.1
Administrative expenses (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Expense by nature        
Cash flow projection period for assessment of withholding tax asset recoverability     5 years  
Expense from acceleration of vesting of share-based payment awards $ 10.1   $ 25.7  
Expense from long-term employee benefits due to changes in expected vesting and settlement amounts in connection with merger agreement 39.9 $ 0.0 57.4 $ 0.0
Contingent amount payable for advisory fees if merger closes 42.0   42.0  
Administrative expense        
Expense by nature        
Staff costs 85.6 43.3 159.3 83.1
Net loss allowance on trade receivables 0.2 1.3 4.3 1.7
Professional fees 22.7 8.8 36.4 18.2
Facilities, short term rental and upkeep 8.5 7.2 16.1 14.3
Travel costs 2.6 2.6 5.1 4.8
Depreciation 1.5 1.9 2.9 4.3
Amortization 0.3 0.2 0.5 0.5
Net gain on disposal of property, plant and equipment and right-of-use assets (1.9) (2.2) (3.3) (3.2)
Operating taxes 0.2 0.2 0.2 0.3
Business combination costs 5.5 0.3 14.7 1.2
Net impairment (reversal)/loss of withholding tax receivables (4.9) (0.5) 0.6 (12.9)
Other 5.1 5.3 9.4 8.9
Total $ 125.4 $ 68.4 $ 246.2 $ 121.2