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Segment reporting - Financials (Details)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2022
USD ($)
Jun. 30, 2021
USD ($)
Jun. 30, 2022
USD ($)
item
Jun. 30, 2021
USD ($)
Disclosure of operating segments [line items]        
Number of operating segments | item     2  
Revenue $ 352.3 $ 347.1 $ 691.1 $ 656.0
Expenses        
Costs of sales 45.5 47.3 89.1 87.9
Depletion and depreciation 69.6 77.2 144.2 148.4
Gross profit 237.2 222.6 457.8 419.7
Other operating (income)/expenses        
General and administrative expenses 5.8 5.4 11.4 9.6
Share-based compensation expense   5.0 4.3 7.0
Impairment and charges   7.5   7.5
Gain on sale of gold bullion (0.2) (0.6) (1.5) (1.2)
Foreign exchange loss (gain) and other expenses (income) 0.4 1.2 (5.8) 1.3
Income before finance items and income taxes 231.2 204.1 449.4 395.5
Finance items        
Finance income 2.8 1.7 3.5 2.4
Finance expenses (0.8) (1.1) (1.7) (1.9)
Net income before income taxes 233.2 204.7 451.2 396.0
Operating Segments        
Disclosure of operating segments [line items]        
Revenue 352.3 347.1 691.1 656.0
Expenses        
Costs of sales 45.5 47.3 89.1 87.9
Depletion and depreciation 69.0 76.6 143.2 147.3
Gross profit 237.8 223.2 458.8 420.8
Other operating (income)/expenses        
General and administrative expenses 5.8 5.4 11.4 9.6
Share-based compensation expense   5.0 4.3 7.0
Impairment and charges   7.5   7.5
Gain on sale of gold bullion (0.2) (0.6) (1.5) (1.2)
Depreciation 0.6 0.6 1.0 1.1
Foreign exchange loss (gain) and other expenses (income) 0.4 1.2 (5.8) 1.3
Income before finance items and income taxes 231.2 204.1 449.4 395.5
Finance items        
Finance income 2.8 1.7 3.5 2.4
Finance expenses (0.8) (1.1) (1.7) (1.9)
Net income before income taxes 233.2 204.7 451.2 396.0
Operating Segments | Mining Segment        
Disclosure of operating segments [line items]        
Revenue 260.8 299.8 524.0 563.6
Expenses        
Costs of sales 41.7 44.7 82.2 82.4
Depletion and depreciation 53.7 61.1 110.9 120.3
Gross profit 165.4 194.0 330.9 360.9
Operating Segments | Energy Segment        
Disclosure of operating segments [line items]        
Revenue 91.5 47.3 167.1 92.4
Expenses        
Costs of sales 3.8 2.6 6.9 5.5
Depletion and depreciation 15.3 15.5 32.3 27.0
Gross profit $ 72.4 $ 29.2 $ 127.9 $ 59.9