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Finance Expense (Tables)
 12 Months Ended
Dec. 31, 2023
Disclosure of finance expense [abstract]  
Summary of finance expense
United States Dollar
Figures in millions unless otherwise stated
2023
2022
2021
Interest expense – environmental rehabilitation
(21.8)
(11.8)
(8.6)
Unwinding of discount rate on silicosis settlement costs
(0.9)
(1.0)
(1.1)
Interest expense – lease liability
(22.7)
(22.5)
(24.1)
Interest expense – borrowings
(82.4)
(75.1)
(79.6)
Borrowing costs capitalised1
64.9
37.9
12.5
Total finance expense
(62.9)
(72.5)
(100.9)
1Borrowing costs capitalised of US$64.9 million (2022: US$37.9 million and 2021: US$12.5 million) comprise borrowing costs relating to general
borrowings.
2Interest paid amounts to US$104.8 million (2022: US$97.2 million and 2021: US$103.2 million) and comprises interest expense - lease liability of
US$22.7 million (2022: US$22.5 million and 2021: US$24.1 million), interest expense - borrowings of US$82.4 million (2022: US$75.1 million  and
2021: US$79.6 million), partially offset by non-cash interest of US$0.3 million  (2022: US$0.4 million and 2021: US$0.5 million).