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Share Capital (Share Capital) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Reconciliation of number of shares outstanding [abstract]    
Beginning balance $ 2,695.3  
Shares issued through:    
Ending balance $ 2,851.5 $ 2,695.3
Issued capital [member]    
Reconciliation of number of shares outstanding [abstract]    
Number of shares outstanding 391,070,817 391,250,203
Beginning balance $ 3,693.3 $ 3,705.2
Shares issued through:    
Share-based employment compensation plans (in shares) 1,653,361 1,555,989
Share-based compensation plans $ 10.3 $ 9.5
Shares repurchased and cancelled (in shares) (1,133,561) (2,748,352)
Shares repurchased and cancelled $ (10.7) $ (26.1)
Exercise of warrants (in shares)   45
Exercise of warrants   $ 0.0
Flow-through share financing (in shares)   1,132,169
Flow-through share financing 0.0 $ 5.9
Cancellation of unexchanged post-amalgamation shares   (119,237)
Cancellation of unexchanged post-amalgamation shares $ 0.0 $ (1.2)
Dividend reinvestment plan and share purchase plan (in shares) 1,186,205  
Dividend reinvestment plan and share purchase plan (ii) $ 10.0  
Number of shares outstanding 392,776,822 391,070,817
Ending balance $ 3,702.9 $ 3,693.3