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Consolidated Statements of Income and Comprehensive Income - USD ($)
shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Consolidated Statements of Income and Comprehensive Income    
Revenue (note 12) $ 1,020.2 $ 844.1
Costs of sales    
Costs of sales (note 13) 158.8 144.8
Depletion and depreciation 241.0 263.2
Total costs of sales 399.8 408.0
Gross profit 620.4 436.1
Other operating expenses (income)    
Impairment charges and reversals (note 8) 262.1  
General and administrative expenses 28.8 28.8
Gain on sale of gold bullion (7.0) (2.9)
Total other operating expenses 283.9 25.9
Operating income 336.5 410.2
Foreign exchange gain (loss) and other income (expenses) 2.8 2.8
Income before finance items and income taxes 339.3 413.0
Finance items (note 15)    
Finance income 3.7 3.5
Finance expenses (3.5) (10.6)
Net income before income taxes 339.5 405.9
Income tax expense (note 16) 13.3 61.8
Net income 326.2 344.1
Items that may be reclassified subsequently to profit and loss:    
Currency translation adjustment 19.6 32.3
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) 43.8 9.9
Other comprehensive income 63.4 42.2
Comprehensive income $ 389.6 $ 386.3
Basic earnings per share (in dollars per share) $ 1.71 $ 1.83
Diluted earnings per share (in dollars per share) $ 1.71 $ 1.83
Weighted average basic number of shares outstanding 190.3 187.7
Weighted average diluted number of shares outstanding 190.7 188.0