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Earnings Per Share (Computation of Basic and Diluted Earnings per Share) (Details) - CAD ($)
$ / shares in Units, shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Numerator    
Net income attributable to common shareholders $ 493.6 $ 977.7
Diluted numerator $ 493.6 $ 977.7
Denominator    
Weighted average shares of common stock outstanding - basic 289.1 273.6
Stock-based compensation 0.1 0.2
Weighted average shares of common stock outstanding- diluted 289.2 273.8
Earnings per common share    
Basic $ 1.71 $ 3.57
Diluted $ 1.71 $ 3.57