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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, 2023
Dec. 31, 2022
Numerator    
Net income attributable to common shareholders $ 977.7 $ 945.1
Diluted numerator $ 977.7 $ 945.1
Denominator    
Weighted average shares of common stock outstanding - basic 273.6 265.5
Stock-based compensation 0.2 0.4
Weighted average shares of common stock outstanding- diluted 273.8 265.9
Earnings per common share    
Basic $ 3.57 $ 3.56
Diluted $ 3.57 $ 3.55