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Share Capital - Additional Information (Details)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2022
CAD ($)
day
$ / shares
shares
Dec. 31, 2021
CAD ($)
shares
Dec. 31, 2020
Nov. 09, 2021
shares
Disclosure of range of exercise prices of outstanding share options [line items]        
Common shares repurchased for cancellation (in shares) | shares 1,085,676 939,482    
Cost of common shares repurchased and cancelled $ 65.3 $ 50.7    
Reduction in share capital 9.6 8.1    
Reduction in contributed surplus accounts 0.1 0.1    
Charges to retained earnings 55.6 42.5    
Dividends declared included in trade and other payables 20.0 18.3    
Share-based compensation expense 26.0 46.7    
Expense related to fair value of options granted 0.0 0.1    
Expense related to amortization of fair value of options granted 26.0 46.6    
Decrease (increase) through tax on share-based payment transactions, equity 0.8 4.9    
Outstanding fair value $ 60.4 $ 62.0    
Bottom of range        
Disclosure of range of exercise prices of outstanding share options [line items]        
Range of exercise prices per share (in cad per share) | $ / shares $ 32.98      
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       5,538,309
RSUs        
Disclosure of range of exercise prices of outstanding share options [line items]        
Vesting period for share-based payment arrangement   3 years    
Number of trading days | day 5      
Number of share units granted 150,591 128,579    
Number of units paid 148,327 0    
Payments made for RSUs $ 8.0 $ 0.0    
Outstanding fair value $ 12.7 $ 15.4    
PSUs        
Disclosure of range of exercise prices of outstanding share options [line items]        
Vesting period for share-based payment arrangement 3 years      
Number of trading days | day 5      
Number of share units granted 263,434 251,120    
Number of units paid 318,058 235,373    
Outstanding fair value $ 32.8 $ 32.5    
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 253,938 242,701    
Fair value of share units granted $ 14.5 $ 14.0    
Number of units paid 318,058 235,373    
Amount of units paid $ 15.3 $ 9.0    
DSUs, excluding dividends        
Disclosure of range of exercise prices of outstanding share options [line items]        
Percentage of compensation 70.00%      
Number of trading days | day 10      
Number of share units granted 28,871 37,162    
Fair value of share units granted $ 1.6 $ 1.8    
DSUs        
Disclosure of range of exercise prices of outstanding share options [line items]        
Number of share units granted 28,871 37,162    
Number of units paid 0 0    
Fair value of outstanding and vested DSUs $ 14.9 $ 14.1    
Officers and employees | RSUs        
Disclosure of range of exercise prices of outstanding share options [line items]        
Number of share units granted 145,884 124,599    
Fair value of share units granted $ 8.0 $ 6.7