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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, 2021 $ 5,628.5 $ 16.1 $ (104.3) $ 484.9 $ 6,025.2
Net (loss) income       700.6 700.6
Other comprehensive loss, net of taxes     (128.7)   (128.7)
Total comprehensive income (loss)         571.9
Exercise of stock options 12.2 (2.7)     9.5
Share-based payments   8.6     8.6
Vesting of restricted share units 6.4 (6.4)      
Transfer of gain on disposal of equity investments at FVTOCI     (0.7) 0.7  
Dividend reinvestment plan 48.2       48.2
Dividends declared       (245.8) (245.8)
Balance at end of period at Dec. 31, 2022 5,695.3 15.6 (233.7) 940.4 6,417.6
Net (loss) income       (466.4) (466.4)
Other comprehensive loss, net of taxes     42.1   42.1
Total comprehensive income (loss)         (424.3)
Exercise of stock options 3.8 (0.9)     2.9
Share-based payments   5.9     5.9
Transfer of gain on disposal of equity investments at FVTOCI     (0.4) 0.4  
Dividend reinvestment plan 29.1       29.1
Dividends declared       (262.1) (262.1)
Balance at end of period at Dec. 31, 2023 $ 5,728.2 $ 20.6 $ (192.0) $ 212.3 $ 5,769.1