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CONDENSED CONSOLIDATED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
CONDENSED CONSOLIDATED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME        
Revenue (Note 10) $ 170.6 $ 171.5 $ 505.0 $ 507.8
Cost of sales        
Costs of sales (Note 11) 33.4 33.0 93.4 106.8
Depletion and depreciation 66.0 70.5 186.2 209.2
Total cost of sales 99.4 103.5 279.6 316.0
Gross profit 71.2 68.0 225.4 191.8
Other operating expenses (income)        
General and administrative expenses 5.2 5.2 17.4 17.9
Loss (gain) on sale of gold bullion 0.2 (0.2) (0.1) (0.3)
Total other operating expenses (income) 5.4 5.0 17.3 17.6
Operating income 65.8 63.0 208.1 174.2
Foreign exchange gain (loss) and other income (expense) 0.1 (0.9) 0.6 0.2
Income before finance items and income taxes 65.9 62.1 208.7 174.4
Finance items        
Finance income 0.7 1.6 2.4 3.6
Finance expenses (0.7) (0.8) (2.4) (2.4)
Net income before income taxes 65.9 62.9 208.7 175.6
Income tax expense (Note 13) 13.8 2.9 38.4 24.4
Net income 52.1 60.0 170.3 151.2
Items that may be reclassified subsequently to profit and loss:        
Changes in the fair value of available-for-sale investments, net of income tax (Note 5)   17.7   7.4
Currency translation adjustment 11.2 41.4 (29.3) 81.9
Items that will not be reclassified subsequently to profit and loss        
Changes in the fair value of equity investments at fair value through other comprehensive income, net of income tax (Note 5) 13.6   (1.7)  
Other comprehensive income (loss) 24.8 59.1 (31.0) 89.3
Comprehensive income $ 76.9 $ 119.1 $ 139.3 $ 240.5
Basic earnings per share (Note 15) (in dollars per share) $ 0.28 $ 0.32 $ 0.92 $ 0.83
Diluted earnings per share (Note 15) (in dollars per share) $ 0.28 $ 0.32 $ 0.91 $ 0.83