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Share Capital - Additional Information (Details)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2024
CAD ($)
shares
day
Dec. 31, 2023
CAD ($)
shares
$ / shares
Dec. 11, 2023
shares
Disclosure of range of exercise prices of outstanding share options [line items]      
Common shares repurchased for cancellation (in shares) | shares 0 129,036  
Cost of common shares repurchased and cancelled   $ 10.0  
Increase (decrease) in number of ordinary shares issued (in shares) | shares   3,108,450  
Treasury price per share (in cad per share) | $ / shares   $ 92.50  
Gross proceeds from issuing shares   $ 287.5  
Proceeds from issue of share capital, net of transaction costs $ 0.0 277.8  
Dividends declared included in trade and other payables 23.9 22.3  
Net share-based compensation expense 43.0 75.6  
Expense related to amortization of fair value of options granted 49.6 60.1  
Reclassification adjustments on cash flow hedges, net of tax 6.6 (15.5)  
Outstanding fair value $ 85.2 $ 95.5  
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     2,281,339
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 | shares 118,812 121,498  
Number of units paid | shares 114,329 127,173  
Payments made for RSUs $ 13.8 $ 10.2  
Outstanding fair value $ 22.2 $ 20.2  
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 | shares 130,644 183,388  
Number of units paid | shares 229,024 284,209  
Outstanding fair value $ 39.5 $ 51.5  
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 | 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 | shares 126,023 177,897  
Fair value of share units granted $ 13.9 $ 15.7  
Number of units paid | shares 229,024 284,209  
Amount of units paid $ 41.6 $ 28.2  
PSUs, Return On Equity Weighting      
Disclosure of range of exercise prices of outstanding share options [line items]      
Weighting of the return on equity target 60.00%    
PSUs, Total Shareholder Return Weighting      
Disclosure of range of exercise prices of outstanding share options [line items]      
Weighting of the return on equity target 40.00%    
Performance Share Units (PSUs), Adjusted Earnings Per Share Growth And Total Shareholder Return Weighting      
Disclosure of range of exercise prices of outstanding share options [line items]      
Weighting of the return on equity target 50.00%    
DSUs      
Disclosure of range of exercise prices of outstanding share options [line items]      
Number of share units granted | shares 13,070 26,146  
Number of units paid | shares 39,424 24,081  
Fair value of outstanding and vested DSUs $ 23.5 $ 23.8  
DSUs, excluding dividends      
Disclosure of range of exercise prices of outstanding share options [line items]      
Number of trading days | day 10    
Number of share units granted | shares 11,446 23,077  
Fair value of share units granted $ 1.3 $ 1.8  
Percentage of compensation 70.00%    
Officers and employees | RSUs      
Disclosure of range of exercise prices of outstanding share options [line items]      
Number of share units granted | shares 116,111 118,259  
Fair value of share units granted $ 13.3 $ 9.5