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Investment Income
12 Months Ended
Dec. 31, 2021
Analysis of income and expense [abstract]  
Investment Income INVESTMENT INCOME
United States Dollar
Figures in millions unless otherwise stated202120202019
Dividends received0.1 
0.4
Interest received – environmental trust funds0.8 0.7 0.7 
Interest received – cash balances7.4 7.6 6.6 
Total investment income8.3 8.7 7.3