v3.25.2
Trade and other receivables (Details) - USD ($)
$ in Millions
 6 Months Ended 12 Months Ended
Jan. 01, 2025
Jun. 30, 2025
Dec. 31, 2024
Trade and other non-current receivables [abstract]      
Accrued revenue and lease incentive   $ 81.1 $ 73.5
Other tax receivables   5.9 5.6
Payment in advance for property, plant and equipment   38.1 24.6
Withholding tax receivables   14.3 14.9
Contingent consideration receivable   2.7 2.4
Trade and other non-current receivables   142.1 121.0 [1]
Trade and other current receivables [abstract]      
Net trade receivables   201.9 220.9
Other receivables   57.1 44.4
Prepaid land rent   2.7 0.8
Other prepaid expenses   15.4 14.5
Advance payments   18.4 10.9
Withholding tax receivables   5.7 10.3
VAT receivables   9.3 10.0
Contingent consideration receivable     1.6
Trade and other current receivables   310.5 $ 313.4 [1]
NIGERIA      
Trade and other current receivables [abstract]      
Withholding tax rate 2.00%   10.00%
Reversal of impairment of withholding tax receivables   $ 20.0 $ 25.2
Maximum      
Trade and other current receivables [abstract]      
Non-current receivable due term   20 years  
Cost      
Trade and other current receivables [abstract]      
Net trade receivables   $ 219.7 237.2
Allowance for expected credit losses      
Trade and other current receivables [abstract]      
Net trade receivables   $ (17.8) $ (16.3)
[1] Revised for corrections to Property, plant and equipment and Trade and other payables (see note 21).