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Segment Reporting - Financials (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2022
USD ($)
item
Dec. 31, 2021
USD ($)
Disclosure of operating segments [line items]    
Number of operating segments | item 2  
Revenue $ 1,315.7 $ 1,300.0
Expenses    
Costs of sales 176.9 178.3
Depletion and depreciation 286.2 299.6
Gross profit 852.6 822.1
Other operating expenses (income)    
General and administrative expenses 22.5 19.6
Share-based compensation expense 10.1 11.2
Impairment reversals   (68.0)
Gain on sale of gold bullion (0.7) (1.4)
Foreign exchange (gain) loss and other (income) expenses (3.6) 3.0
Income before finance items and income taxes 824.3 857.7
Finance items    
Finance income 12.6 3.7
Finance expenses (3.2) (3.6)
Net income before income taxes 833.7 857.8
Operating Segments    
Disclosure of operating segments [line items]    
Revenue 1,315.7 1,300.0
Expenses    
Costs of sales 176.9 178.3
Depletion and depreciation 285.6 297.4
Gross profit 853.2 824.3
Other operating expenses (income)    
General and administrative expenses   (68.0)
Share-based compensation expense 22.5 19.6
Impairment reversals 10.1 11.2
Gain on sale of gold bullion (0.7) (1.4)
Depreciation 0.6 2.2
Foreign exchange (gain) loss and other (income) expenses (3.6) 3.0
Income before finance items and income taxes 824.3 857.7
Finance items    
Finance income 12.6 3.7
Finance expenses (3.2) (3.6)
Net income before income taxes 833.7 857.8
Operating Segments | Mining Segment    
Disclosure of operating segments [line items]    
Revenue 982.1 1,090.5
Expenses    
Costs of sales 160.3 166.6
Depletion and depreciation 217.6 239.5
Gross profit 604.2 684.4
Operating Segments | Energy Segment    
Disclosure of operating segments [line items]    
Revenue 333.6 209.5
Expenses    
Costs of sales 16.6 11.7
Depletion and depreciation 68.0 57.9
Gross profit $ 249.0 $ 139.9