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Share Capital - Additional Information (Details)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2021
CAD ($)
day
$ / shares
shares
Dec. 31, 2020
CAD ($)
shares
Dec. 31, 2019
Nov. 09, 2021
shares
Disclosure of range of exercise prices of outstanding share options [line items]        
Common shares repurchased for cancellation (in shares) | shares 939,482 2,047,948    
Cost of common shares repurchased and cancelled $ 50.7 $ 78.3    
Reduction in share capital 8.1 16.8    
Reduction in contributed surplus accounts 0.1 0.4    
Charges to retained earnings 42.5 61.1    
Dividends declared included in trade and other payables 18.3 17.2    
Share-based compensation expense 46.7 16.4    
Expense related to fair value of options granted 0.1 1.0    
Expense related to amortization of fair value of options granted 46.6 15.4    
Decrease (increase) through tax on share-based payment transactions, equity 4.9 0.9    
Outstanding fair value $ 62.0 $ 25.5    
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 $ 31.75      
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       5,559,312
Range of exercise prices per share (in cad per share) | $ / shares $ 32.98      
RSUs        
Disclosure of range of exercise prices of outstanding share options [line items]        
Number of share units granted 128,579 142,043    
Vesting period for share-based payment arrangement   3 years    
Number of trading days | day 5      
Outstanding fair value $ 15.4 $ 4.2    
Number of units paid 0 0    
PSUs        
Disclosure of range of exercise prices of outstanding share options [line items]        
Number of share units granted 251,120 320,256    
Vesting period for share-based payment arrangement 3 years      
Outstanding fair value $ 32.5 $ 14.3    
Number of units paid 235,373 234,966    
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 242,701 308,136    
Fair value of share units granted $ 14.0 $ 16.4    
Number of units paid 235,373 234,966    
Amount of units paid $ 9.0 $ 6.6    
DSUs, excluding dividends        
Disclosure of range of exercise prices of outstanding share options [line items]        
Number of share units granted 37,162 37,147    
Fair value of share units granted $ 1.8 $ 1.4    
Number of trading days | day 10      
DSUs        
Disclosure of range of exercise prices of outstanding share options [line items]        
Number of share units granted 37,162 37,147    
Number of units paid 0 149,848    
Amount of units paid   $ 6.1    
Fair value of outstanding and vested DSUs $ 14.1 $ 6.7    
Officers and employees        
Disclosure of range of exercise prices of outstanding share options [line items]        
Weighted average remaining contractual life of outstanding share options 9 months 10 days      
Officers and employees | RSUs        
Disclosure of range of exercise prices of outstanding share options [line items]        
Number of share units granted 124,599 138,148,000,000    
Fair value of share units granted $ 6.7 $ 5.8