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CONSOLIDATED INCOME STATEMENTS - USD ($)
shares in Millions, $ in Millions
 1 Months Ended 12 Months Ended
Dec. 31, 2022
Dec. 31, 2022
Dec. 31, 2021
Profit or loss [abstract]      
Revenues   $ 604.4 $ 745.5
Operating expenses   382.7 377.3
Depreciation and depletion   195.4 195.7
Revenue less cost of goods sold   26.3 172.5
Corporate administration   21.3 21.8
Corporate restructuring $ 2.1 2.1 0.0
Share-based payment expenses   2.6 2.2
Exploration and business development   16.0 11.2
(Loss) income from operations   (15.7) 137.3
Finance income   3.8 0.3
Finance costs   (27.8) (34.8)
Other (losses) gains   (25.7) 57.5
(Loss) income before taxes   (65.4) 160.3
Income tax expense   (1.4) (19.7)
Net (loss) earnings   $ (66.8) $ 140.6
Earnings (loss) per share      
Basic (in dollars per share)   $ (0.10) $ 0.21
Diluted (in dollars per share)   $ (0.10) $ 0.21
Weighted average number of shares outstanding (in millions)      
Basic (in shares)   681.9 680.8
Diluted (in shares)   681.9 682.4