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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, 2020
Dec. 31, 2019
Numerator    
Net income attributable to common shareholders $ 937.6 $ 662.8
Diluted numerator $ 937.6 $ 662.8
Denominator    
Weighted average shares of common stock outstanding 246.5 238.5
Weighted average deferred share units outstanding 1.3 1.4
Weighted average shares of common stock outstanding - basic 247.8 239.9
Stock-based compensation 0.4 0.6
Weighted average shares of common stock outstanding- diluted 248.2 240.5
Earnings per common share    
Basic $ 3.78 $ 2.76
Diluted $ 3.78 $ 2.76