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Share Capital (Share Capital) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Reconciliation of number of shares outstanding [abstract]    
Beginning balance $ 2,851.5  
Shares issued through:    
Ending balance $ 2,735.6 $ 2,851.5
Issued capital [member]    
Reconciliation of number of shares outstanding [abstract]    
Number of shares outstanding 392,776,822 391,070,817
Beginning balance $ 3,702.9 $ 3,693.3
Shares issued through:    
Share-based employment compensation plans (in shares) 40,000 1,653,361
Share-based compensation plans $ 0.3 $ 10.3
Shares repurchased and cancelled (in shares) (1,583,562) (1,133,561)
Shares repurchased and cancelled   $ (10.7)
Dividend reinvestment plan and share purchase plan (in shares) 656,473 1,186,205
Dividend reinvestment plan (ii) $ 4.6 $ 10.0
Number of shares outstanding 391,889,733 392,776,822
Ending balance $ 3,692.9 $ 3,702.9