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Investment Income
12 Months Ended
Dec. 31, 2023
Analysis of income and expense [abstract]  
Investment Income Investment income
United States Dollar
Figures in millions unless otherwise stated
2023
2022
2021
Dividends received
0.3
0.1
0.1
Interest received – environmental trust funds
1.2
1.1
0.8
Interest received – cash balances
23.4
12.1
7.4
Total investment income
24.9
13.3
8.3