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Share Capital - Additional Information (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2020
CAD ($)
day
shares
Dec. 31, 2019
CAD ($)
shares
Nov. 12, 2020
shares
Disclosure of range of exercise prices of outstanding share options [line items]      
Common shares repurchased for cancellation (in shares) | shares 2,047,948 1,400,713  
Cost of common shares repurchased and cancelled $ 78.3 $ 43.2  
Reduction in share capital 16.8 10.9  
Reduction in contributed surplus accounts 0.4 0.3  
Charges to retained earnings (61.1) (32.0)  
Dividends declared included in trade and other payables 17.2 16.1  
Share-based compensation expense 16.4 18.1  
Expense related to fair value of options granted 1.0 3.4  
Expense related to amortization of fair value of options granted 15.4 14.7  
Adjustments for share-based payments 0.9    
Outstanding fair value $ 25.5 $ 23.0  
Top of range      
Disclosure of range of exercise prices of outstanding share options [line items]      
Maximum common shares authorized to be repurchased (in shares) | shares     5,605,224
RSUs      
Disclosure of range of exercise prices of outstanding share options [line items]      
Number of share units granted 142,043 166,963  
Outstanding fair value $ 4.2 $ 1.1  
Number of DSUs paid 0 0  
PSUs      
Disclosure of range of exercise prices of outstanding share options [line items]      
Number of share units granted 320,256 379,289  
Vesting period for share-based payment arrangement 3 years    
Outstanding fair value $ 14.3 $ 11.1  
Number of DSUs paid 234,966 198,815  
PSUs | Bottom of range      
Disclosure of range of exercise prices of outstanding share options [line items]      
Weighting of the return on equity target   40.00%  
PSUs | Bottom of range | Option pricing model      
Disclosure of range of exercise prices of outstanding share options [line items]      
Number of units vest percentage 0.00%    
PSUs | Top of range      
Disclosure of range of exercise prices of outstanding share options [line items]      
Weighting of the return on equity target   60.00%  
PSUs | Top of range | Option pricing model      
Disclosure of range of exercise prices of outstanding share options [line items]      
Number of units vest percentage 200.00%    
PSUs, excluding dividends      
Disclosure of range of exercise prices of outstanding share options [line items]      
Number of share units granted 308,136 378,049  
Fair value of share units granted $ 16.4 $ 11.6  
DSUs      
Disclosure of range of exercise prices of outstanding share options [line items]      
Number of share units granted 37,147 44,806  
Number of DSUs paid 149,848 75,315  
Amount of DSUs paid $ 6.1 $ 2.4  
Fair value of outstanding and vested DSUs $ 6.7 $ 10.2  
DSUs, excluding dividends      
Disclosure of range of exercise prices of outstanding share options [line items]      
Number of share units granted 37,147 44,772  
Fair value of share units granted $ 1.4 $ 1.2  
DSUs conversion rate to common share 1    
Number of trading days | day 10    
Officers and employees | RSUs      
Disclosure of range of exercise prices of outstanding share options [line items]      
Number of share units granted 138,148    
Fair value of share units granted $ 5.8    
Vesting period for share-based payment arrangement 3 years