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Goodwill - Schedule of Goodwill Allocated (Details) - CAD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Jan. 01, 2023
Disclosure of information for cash-generating units [line items]      
Goodwill $ 2,712.5 $ 2,073.6 [1] $ 2,032.6 [1]
Canada      
Disclosure of information for cash-generating units [line items]      
Goodwill   293.8 293.8
United States      
Disclosure of information for cash-generating units [line items]      
Goodwill   1,316.0 1,268.4
Global      
Disclosure of information for cash-generating units [line items]      
Goodwill   463.8 $ 470.4
Total for all cash-generating units      
Disclosure of information for cash-generating units [line items]      
Goodwill 2,712.5 2,073.6  
Total for all cash-generating units | Canada      
Disclosure of information for cash-generating units [line items]      
Goodwill 422.7 293.8  
Total for all cash-generating units | United States      
Disclosure of information for cash-generating units [line items]      
Goodwill 1,479.3 1,316.0  
Total for all cash-generating units | Global      
Disclosure of information for cash-generating units [line items]      
Goodwill $ 810.5 $ 463.8  
[1] Revised for change in accounting policy (see Note 6.c)