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Consolidated Statements of Changes in Shareholders' Equity - USD ($)
$ in Millions
Share Capital
Contributed Surplus
Accumulated other comprehensive loss
Retained Earnings (Deficit)
Total
Balance at beginning 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 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
Net income       733.7 733.7
Other comprehensive income     18.6   18.6
Total comprehensive income         752.3
Exercise of stock options 0.5 (0.1)     0.4
Share-based payments   8.3     8.3
Vesting of restricted share units 6.1 (6.1)      
Transfer of gain on disposal of equity investments at FVTOCI     (7.0) 7.0  
Dividend reinvestment plan 41.8       41.8
Dividends declared       (221.4) (221.4)
Balance at end of period at Dec. 31, 2021 $ 5,628.5 $ 16.1 $ (104.3) $ 484.9 $ 6,025.2