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About the presentation of our financial statements - Exchange rate (Details) - USD ($)
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Pound sterling      
Disclosure Of Foreign Exchange Rates [Line Items]      
Full-year average 1.28 1.24 1.24
Year-end 1.25 1.28 1.21
Australian dollar      
Disclosure Of Foreign Exchange Rates [Line Items]      
Full-year average 0.66 0.66 0.69
Year-end 0.62 0.69 0.68
Canadian dollar      
Disclosure Of Foreign Exchange Rates [Line Items]      
Full-year average 0.73 0.74 0.77
Year-end 0.70 0.76 0.74
Euro      
Disclosure Of Foreign Exchange Rates [Line Items]      
Full-year average 1.08 1.08 1.05
Year-end 1.04 1.11 1.07
South African rand      
Disclosure Of Foreign Exchange Rates [Line Items]      
Full-year average 0.055 0.054 0.061
Year-end 0.053 0.054 0.059