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Segment Reporting - Financials (Details)
$ in Millions
 12 Months Ended
Mar. 31, 2020
USD ($)
Dec. 31, 2021
USD ($)
item
Dec. 31, 2020
USD ($)
Segment Reporting      
Number of operating segments | item   2  
Revenue   $ 1,300.0 $ 1,020.2
Expenses      
Costs of sales   178.3 158.8
Depletion and depreciation   299.6 241.0
Gross profit   822.1 620.4
Other operating (income)/expenses      
Impairment (reversals) and charges $ 271.7 (68.0) 262.1
General and administrative expenses   19.6 19.2
Share-based compensation expense   11.2 9.6
Gain on sale of gold bullion   (1.4) (7.0)
Foreign exchange loss and other (income) expenses   3.0 (2.8)
Income before finance items and income taxes   857.7 339.3
Finance items      
Finance income   3.7 3.7
Finance expenses   (3.6) (3.5)
Net income before income taxes   857.8 339.5
Operating Segments      
Segment Reporting      
Revenue   1,300.0 1,020.2
Expenses      
Costs of sales   178.3 158.8
Depletion and depreciation   297.4 238.7
Gross profit   824.3 622.7
Other operating (income)/expenses      
Impairment (reversals) and charges   (68.0) 262.1
General and administrative expenses   19.6 19.2
Share-based compensation expense   11.2 9.6
Gain on sale of gold bullion   (1.4) (7.0)
Depreciation   2.2 2.3
Foreign exchange loss and other (income) expenses   3.0 (2.8)
Income before finance items and income taxes   857.7 339.3
Finance items      
Finance income   3.7 3.7
Finance expenses   (3.6) (3.5)
Net income before income taxes   857.8 339.5
Operating Segments | Mining Segment      
Segment Reporting      
Revenue   1,090.5 928.5
Expenses      
Costs of sales   166.6 152.4
Depletion and depreciation   239.5 193.8
Gross profit   684.4 582.3
Operating Segments | Energy Segment      
Segment Reporting      
Revenue   209.5 91.7
Expenses      
Costs of sales   11.7 6.4
Depletion and depreciation   57.9 44.9
Gross profit   $ 139.9 $ 40.4