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Consolidated Statements of Changes in Shareholders' Equity - USD ($)
$ in Millions
Share Capital (Note 17)
Contributed Surplus
Accumulated Other Comprehensive Income (Loss)
Deficit
Total
Balance at beginning of period at Dec. 31, 2018 $ 5,158.3 $ 15.6 $ (220.3) $ (321.7) $ 4,631.9
Net income       344.1 344.1
Other comprehensive (loss) income     42.2   42.2
Total comprehensive income         386.3
At-the-market equity offering 136.0       136.0
Acquisition of Salares Norte 27.0       27.0
Exercise of stock options 17.3 (4.1)     13.2
Share-based payments   6.0     6.0
Vesting of restricted share units 3.3 (3.3)      
Transfer of gain on disposal of equity investments at FVTOCI     (0.2) 0.2  
Dividend reinvestment plan 48.8       48.8
Dividends declared       (187.0) (187.0)
Balance at end of period at Dec. 31, 2019 5,390.7 14.2 (178.3) (164.4) 5,062.2
Net income       326.2 326.2
Other comprehensive (loss) income     63.4   63.4
Total comprehensive income         389.6
At-the-market equity offering 133.7       133.7
Exercise of stock options 9.7 (2.3)     7.4
Share-based payments   5.8     5.8
Vesting of restricted share units 3.7 (3.7)      
Transfer of gain on disposal of equity investments at FVTOCI     (1.0) 1.0  
Dividend reinvestment plan 42.3       42.3
Dividends declared       (197.2) (197.2)
Balance at end of period at Dec. 31, 2020 $ 5,580.1 $ 14.0 $ (115.9) $ (34.4) $ 5,443.8