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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, 2022
Dec. 31, 2021
Numerator    
Net income attributable to common shareholders $ 945.1 $ 510.5
Diluted numerator $ 945.1 $ 510.5
Denominator    
Weighted average shares of common stock outstanding 265.5 255.9
Weighted average deferred share units outstanding 0.0 1.3
Weighted average shares of common stock outstanding - basic 265.5 257.2
Stock-based compensation 0.4 0.4
Weighted average shares of common stock outstanding- diluted 265.9 258.0
Earnings per common share    
Basic $ 3.56 $ 1.98
Diluted $ 3.55 $ 1.98