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Financial Instruments - Summary of Loss Allowance Provision (Details) - CAD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Disclosure of provision matrix [line items]    
Loss allowance provision, end of the year $ 2.0 $ 2.0
Cost    
Disclosure of provision matrix [line items]    
Gross carrying amount 1,720.1 1,348.3
Accumulated impairment    
Disclosure of provision matrix [line items]    
Loss allowance provision, end of the year $ 2.6 $ 2.6
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 $ 1,286.3 $ 1,026.1
1–30 | Accumulated impairment    
Disclosure of provision matrix [line items]    
Loss allowance provision, end of the year $ 1.1 $ 1.1
31–60    
Disclosure of provision matrix [line items]    
Expected loss rate 0.11% 0.14%
31–60 | Cost    
Disclosure of provision matrix [line items]    
Gross carrying amount $ 246.9 $ 181.1
31–60 | Accumulated impairment    
Disclosure of provision matrix [line items]    
Loss allowance provision, end of the year $ 0.2 $ 0.2
61–90    
Disclosure of provision matrix [line items]    
Expected loss rate 0.28% 0.34%
61–90 | Cost    
Disclosure of provision matrix [line items]    
Gross carrying amount $ 71.6 $ 56.3
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 0.61% 0.73%
91–120 | Cost    
Disclosure of provision matrix [line items]    
Gross carrying amount $ 39.8 $ 30.7
91–120 | Accumulated impairment    
Disclosure of provision matrix [line items]    
Loss allowance provision, end of the year $ 0.2 $ 0.2
121+    
Disclosure of provision matrix [line items]    
Expected loss rate 1.27% 1.55%
121+ | Cost    
Disclosure of provision matrix [line items]    
Gross carrying amount $ 75.5 $ 54.1
121+ | Accumulated impairment    
Disclosure of provision matrix [line items]    
Loss allowance provision, end of the year $ 0.9 $ 0.9