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Investment Income
12 Months Ended
Dec. 31, 2022
Analysis of income and expense [abstract]  
Investment Income INVESTMENT INCOME
United States Dollar
Figures in millions unless otherwise stated202220212020
Dividends received0.1 
0.1
0.4
Interest received – environmental trust funds1.1 0.8 0.7 
Interest received – cash balances12.1 7.4 7.6 
Total investment income13.3 8.3 8.7