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Finance Expense (Tables)
 12 Months Ended
Dec. 31, 2022
Disclosure of finance expense [abstract]  
Summary of finance expense
United States Dollar
Figures in millions unless otherwise stated202220212020
Interest expense – environmental rehabilitation(11.8)(8.6)(10.7)
Unwinding of discount rate on silicosis settlement costs(1.0)(1.1)(1.5)
Interest expense – lease liability(22.5)(24.1)(22.4)
Interest expense – borrowings(75.1)(79.6)(105.3)
Borrowing costs capitalised1
37.9 12.5 13.2 
Total finance expense(72.5)(100.9)(126.7)
1    Borrowing costs capitalised of US$37.9 million (2021: US$12.5 million and 2020: US$13.2 million) comprise borrowing costs relating to general borrowings.
2    Interest paid amounts to US$97.2 million (2021: US$103.2 million and 2020: US$127.2 million) and comprises interest expense - lease liability of US$22.5 million (2021: US$24.1 million and 2020: US$22.4 million), interest expense - borrowings of US$75.1 million (2021: US$79.6 million and 2020: US$105.3 million), partially offset by non-cash interest of US$0.4 million (2021: US$0.5 million and 2020: US$0.5 million).