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Segment Reporting - Financials (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2023
USD ($)
item
Dec. 31, 2022
USD ($)
Segment Reporting    
Number of operating segments | item 2  
Revenue $ 1,219.0 $ 1,315.7
Expenses    
Costs of sales 179.3 176.9
Depletion and depreciation 273.1 286.2
Gross profit 766.6 852.6
Other operating expenses (income)    
General and administrative expenses 24.5 22.5
Share-based compensation expenses 4.4 10.1
Impairment losses (Note 9) 1,173.3  
Gain on sale of royalty interest (Note 9) (3.7)  
Gain on sale of gold bullion (3.9) (0.7)
Foreign exchange gain and other income (14.4) (3.6)
(Loss) income before finance items and income taxes (413.6) 824.3
Finance items    
Finance income 52.3 12.6
Finance expenses (2.9) (3.2)
Net (loss) income before income taxes (364.2) 833.7
Operating Segments    
Segment Reporting    
Revenue 1,219.0 1,315.7
Expenses    
Costs of sales 179.3 176.9
Depletion and depreciation 272.4 285.6
Gross profit 767.3 853.2
Other operating expenses (income)    
General and administrative expenses 24.5 22.5
Share-based compensation expenses 4.4 10.1
Impairment losses (Note 9) 1,173.3  
Gain on sale of royalty interest (Note 9) (3.7)  
Gain on sale of gold bullion (3.9) (0.7)
Depreciation 0.7 0.6
Foreign exchange gain and other income (14.4) (3.6)
(Loss) income before finance items and income taxes (413.6) 824.3
Finance items    
Finance income 52.3 12.6
Finance expenses (2.9) (3.2)
Net (loss) income before income taxes (364.2) 833.7
Operating Segments | Mining Segment    
Segment Reporting    
Revenue 1,011.3 982.1
Expenses    
Costs of sales 166.6 160.3
Depletion and depreciation 209.9 217.6
Gross profit 634.8 604.2
Operating Segments | Energy Segment    
Segment Reporting    
Revenue 207.7 333.6
Expenses    
Costs of sales 12.7 16.6
Depletion and depreciation 62.5 68.0
Gross profit $ 132.5 $ 249.0