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CONSOLIDATED INCOME STATEMENTS - USD ($)
shares in Millions, $ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Profit or loss [abstract]    
Revenues $ 745.5 $ 643.4
Operating expenses 377.3 339.9
Depreciation and depletion 195.7 193.1
Revenue less cost of goods sold 172.5 110.4
Corporate administration 21.8 15.6
Share-based payment expenses 2.2 7.6
Exploration and business development 11.2 5.8
Income from operations 137.3 81.4
Finance income 0.3 1.1
Finance costs (34.8) (79.2)
Other gains (losses) 57.5 (78.3)
Income (loss) before taxes 160.3 (75.0)
Income tax expense (19.7) (4.3)
Net earnings (loss) $ 140.6 $ (79.3)
Earnings (loss) per share    
Basic (in dollars per share) $ 0.21 $ (0.12)
Diluted (in dollars per share) $ 0.21 $ (0.12)
Weighted average number of shares outstanding (in millions)    
Basic (in shares) 680.8 676.3
Diluted (in shares) 682.4 676.3