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About the presentation of our financial statements - Exchange rate (Details)
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Pound sterling      
Disclosure Of Foreign Exchange Rates [Line Items]      
Full-year average 1.24 1.24 1.38
Year-end 1.28 1.21 1.35
Australian dollar      
Disclosure Of Foreign Exchange Rates [Line Items]      
Full-year average 0.66 0.69 0.75
Year-end 0.69 0.68 0.73
Canadian dollar      
Disclosure Of Foreign Exchange Rates [Line Items]      
Full-year average 0.74 0.77 0.80
Year-end 0.76 0.74 0.78
Euro      
Disclosure Of Foreign Exchange Rates [Line Items]      
Full-year average 1.08 1.05 1.18
Year-end 1.11 1.07 1.13
South African rand      
Disclosure Of Foreign Exchange Rates [Line Items]      
Full-year average 0.054 0.061 0.068
Year-end 0.054 0.059 0.063