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Financial Instruments - Schedule of Loss Allowance Provision (Details) - CAD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Disclosure of provision matrix [line items]    
Loss allowance provision, end of the year $ 2.7 $ 2.0
Cost    
Disclosure of provision matrix [line items]    
Gross carrying amount 1,844.5 1,720.1
Accumulated impairment    
Disclosure of provision matrix [line items]    
Loss allowance provision, end of the year $ 3.5 $ 2.6
1–30    
Disclosure of provision matrix [line items]    
Expected loss rate 0.09% 0.07%
1–30 | Cost    
Disclosure of provision matrix [line items]    
Gross carrying amount $ 1,329.5 $ 1,286.3
1–30 | Accumulated impairment    
Disclosure of provision matrix [line items]    
Loss allowance provision, end of the year $ 1.2 $ 1.1
31–60    
Disclosure of provision matrix [line items]    
Expected loss rate 0.08% 0.11%
31–60 | Cost    
Disclosure of provision matrix [line items]    
Gross carrying amount $ 309.0 $ 246.9
31–60 | Accumulated impairment    
Disclosure of provision matrix [line items]    
Loss allowance provision, end of the year $ 0.3 $ 0.2
61–90    
Disclosure of provision matrix [line items]    
Expected loss rate 0.23% 0.28%
61–90 | Cost    
Disclosure of provision matrix [line items]    
Gross carrying amount $ 92.1 $ 71.6
61–90 | Accumulated impairment    
Disclosure of provision matrix [line items]    
Loss allowance provision, end of the year $ 0.2 $ 0.2
91–120    
Disclosure of provision matrix [line items]    
Expected loss rate 0.75% 0.61%
91–120 | Cost    
Disclosure of provision matrix [line items]    
Gross carrying amount $ 31.7 $ 39.8
91–120 | Accumulated impairment    
Disclosure of provision matrix [line items]    
Loss allowance provision, end of the year $ 0.3 $ 0.2
121+    
Disclosure of provision matrix [line items]    
Expected loss rate 1.41% 1.27%
121+ | Cost    
Disclosure of provision matrix [line items]    
Gross carrying amount $ 82.2 $ 75.5
121+ | Accumulated impairment    
Disclosure of provision matrix [line items]    
Loss allowance provision, end of the year $ 1.5 $ 0.9