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Share Capital (Share Capital) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Reconciliation of number of shares outstanding [abstract]    
Beginning balance $ 2,721.1  
Shares issued through:    
Shares repurchased and cancelled (in shares) 0 (1,100,000)
Exercise of Manitou warrants (in shares) 60,983  
Ending balance $ 2,923.5 $ 2,721.1
Issued capital [member]    
Reconciliation of number of shares outstanding [abstract]    
Number of shares outstanding 393,806,489 391,889,733
Beginning balance $ 3,703.8 $ 3,692.9
Shares issued through:    
Share-based employment compensation plans (in shares) 1,425,024 1,198,125
Share-based compensation plans $ 12.3 $ 7.6
Shares repurchased and cancelled (in shares)   (1,100,000)
Shares repurchased and cancelled (i) 0.0 $ (10.4)
Flow-through share financing (in shares)   922,483
Flow-through share financing $ 0.0 $ 6.9
Stock Issued During Period, Share, Acquisition 1,045,593  
Dividend reinvestment plan and share purchase plan (in shares) 353,084 527,770
DRIP (ii) $ 4.1 $ 4.1
Shares issued through share purchase plan (in shares) 469,566 373,806
ESPP (iii) $ 5.6 $ 2.7
Exercise of Manitou warrants (note 8) 0.9 0.0
Issuance of shares related to Manitou acquisition (note 8) 13.4 0.0
Cancellation of unexchanged shares $ (1.5) $ 0.0
Cancellation of unexchanged shares (in shares) (203,755) (5,428)
Number of shares outstanding 396,956,984 393,806,489
Ending balance $ 3,738.6 $ 3,703.8