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Share Capital - Additional Information (Detail) - CAD ($)
$ in Millions
 12 Months Ended
Nov. 13, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of classes of share capital [abstract]      
Description of unlimited shares authorized   Common shares, with no par value  
Repurchase of common shares 5,559,313    
Shares Repurchased for cancellation   1,400,713 2,470,560
Shares repurchased for cancellation   $ 43.2 $ 76.7
Reduction in share capital   10.9 19.1
Reduction in contributed surplus accounts   0.3 0.5
Charges to retained earnings   32.0 57.1
Share-based compensation expense   18.1 5.3
Expense related to fair value of options granted   3.4 5.6
Expense related to amortization of fair value of options granted   14.7 0.3
Dividends declared included in trade and other payables   $ 16.1 $ 15.4