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Consolidated Statements of Income and Comprehensive Income - USD ($)
shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Ifrs Statement Line Items    
Revenue (note 12) $ 1,300.0 $ 1,020.2
Costs of sales    
Costs of sales (note 13) 178.3 158.8
Depletion and depreciation 299.6 241.0
Total costs of sales 477.9 399.8
Gross profit 822.1 620.4
Other operating expenses (income)    
General and administrative expenses 19.6 19.2
Share-based compensation expenses (note 14) 11.2 9.6
Impairment (reversals) and charges (68.0) 262.1
Gain on sale of gold bullion (1.4) (7.0)
Total other operating expenses (income) (38.6) 283.9
Operating income 860.7 336.5
Foreign exchange (loss) gain and other income (expenses) (3.0) 2.8
Income before finance items and income taxes 857.7 339.3
Finance items (note 16)    
Finance income 3.7 3.7
Finance expenses (3.6) (3.5)
Net income before income taxes 857.8 339.5
Income tax expense (note 17) 124.1 13.3
Net income 733.7 326.2
Items that may be reclassified subsequently to profit and loss:    
Currency translation adjustment (4.0) 19.6
Items that will not be reclassified subsequently to profit and loss:    
Gain on changes in the fair value of equity investments at fair value through other comprehensive income ("FVTOCI"), net of income tax (note 6) 22.6 43.8
Other comprehensive income 18.6 63.4
Comprehensive income $ 752.3 $ 389.6
Basic earnings per share (in dollars per share) $ 3.84 $ 1.71
Diluted earnings per share (in dollars per share) $ 3.83 $ 1.71
Weighted average basic number of shares outstanding 191.1 190.3
Weighted average diluted number of shares outstanding 191.5 190.7