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Recent Accounting Pronouncements and Changes to Accounting Policies - Consolidated Statements of Income (Details) - CAD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Disclosure of detailed information about financial instruments [line items]    
Administrative and marketing expenses $ 2,286.1 $ 1,965.3 [1]
Income before income taxes 465.3 407.7 [1]
Deferred income taxes (42.4) (50.4) [1]
Net income $ 361.5 $ 316.5 [1]
Earnings per share, basic (in cad per share) $ 3.17 $ 2.85 [1]
Earnings per share, diluted (in cad per share) $ 3.17 $ 2.85 [1]
Previously stated    
Disclosure of detailed information about financial instruments [line items]    
Administrative and marketing expenses   $ 1,945.8
Income before income taxes   427.2
Deferred income taxes   (45.6)
Net income   $ 331.2
Earnings per share, basic (in cad per share)   $ 2.98
Earnings per share, diluted (in cad per share)   $ 2.98
Increase (Decrease)    
Disclosure of detailed information about financial instruments [line items]    
Administrative and marketing expenses   $ 19.5
Income before income taxes   (19.5)
Deferred income taxes   (4.8)
Net income   $ (14.7)
Earnings per share, basic (in cad per share)   $ (0.13)
Earnings per share, diluted (in cad per share)   $ (0.13)
[1] Revised for change in accounting policy (see Note 6.c)