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Consolidated Statement of Changes in Equity (Parenthetical) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Statement of Stockholders Equity    
Issue costs, net of taxes $ 0.1  
Accumulated other comprehensive loss comprises items that will not be recycled 19.2 $ 37.6
Accumulated other comprehensive loss comprises items that may be recycled $ 32.7 $ 61.1
Number of shares issued 157,469,361  
Number of common shares deemed to have been repurchased 517,409