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Financial Instruments - Schedule of Loss Allowance Provision (Details) - CAD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Cost    
Disclosure of provision matrix [line items]    
Gross carrying amount $ 2,271.8 $ 1,844.5
Accumulated impairment    
Disclosure of provision matrix [line items]    
Loss allowance provision, end of the year $ 3.5 $ 3.5
1–30    
Disclosure of provision matrix [line items]    
Expected loss rate 0.07% 0.09%
1–30 | Cost    
Disclosure of provision matrix [line items]    
Gross carrying amount $ 1,642.6 $ 1,329.5
1–30 | Accumulated impairment    
Disclosure of provision matrix [line items]    
Loss allowance provision, end of the year $ 1.2 $ 1.2
31–60    
Disclosure of provision matrix [line items]    
Expected loss rate 0.11% 0.08%
31–60 | Cost    
Disclosure of provision matrix [line items]    
Gross carrying amount $ 380.6 $ 309.0
31–60 | Accumulated impairment    
Disclosure of provision matrix [line items]    
Loss allowance provision, end of the year $ 0.4 $ 0.3
61–90    
Disclosure of provision matrix [line items]    
Expected loss rate 0.25% 0.23%
61–90 | Cost    
Disclosure of provision matrix [line items]    
Gross carrying amount $ 118.3 $ 92.1
61–90 | Accumulated impairment    
Disclosure of provision matrix [line items]    
Loss allowance provision, end of the year $ 0.3 $ 0.2
91–120    
Disclosure of provision matrix [line items]    
Expected loss rate 0.55% 0.75%
91–120 | Cost    
Disclosure of provision matrix [line items]    
Gross carrying amount $ 36.1 $ 31.7
91–120 | Accumulated impairment    
Disclosure of provision matrix [line items]    
Loss allowance provision, end of the year $ 0.2 $ 0.3
121+    
Disclosure of provision matrix [line items]    
Expected loss rate 1.49% 1.41%
121+ | Cost    
Disclosure of provision matrix [line items]    
Gross carrying amount $ 94.2 $ 82.2
121+ | Accumulated impairment    
Disclosure of provision matrix [line items]    
Loss allowance provision, end of the year $ 1.4 $ 1.5