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Share Capital (Share Capital) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Reconciliation of number of shares outstanding [abstract]    
Beginning balance $ 2,735.6  
Shares issued through:    
Ending balance $ 2,721.1 $ 2,735.6
Issued capital [member]    
Reconciliation of number of shares outstanding [abstract]    
Number of shares outstanding 391,889,733 392,776,822
Beginning balance $ 3,692.9 $ 3,702.9
Shares issued through:    
Share-based employment compensation plans (in shares) 1,198,125 40,000
Share-based compensation plans $ 7.6 $ 0.3
Shares repurchased and cancelled (in shares) (1,100,000) (1,583,562)
Shares repurchased and cancelled   $ (14.9)
Flow-through share financing (in shares) 922,483  
Flow-through share financing $ 6.9 $ 0.0
Dividend reinvestment plan and share purchase plan (in shares) 527,770 656,473
Dividend reinvestment plan (iii) $ 4.1 $ 4.6
Shares issued through share purchase plan (in shares) 373,806  
Shares issued through share purchase plan $ 2.7 $ 0.0
Cancellation of unexchanged shares $ 0.0  
Cancellation of unexchanged shares (in shares) (5,428)  
Number of shares outstanding 393,806,489 391,889,733
Ending balance $ 3,703.8 $ 3,692.9