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Financial Instruments - Summary of Loss Allowance Provision (Details) - CAD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Disclosure of provision matrix [line items]    
Loss allowance provision, end of the year $ 3.0 $ 2.2
Cost    
Disclosure of provision matrix [line items]    
Gross carrying amount 1,180.9 1,308.3
Accumulated impairment    
Disclosure of provision matrix [line items]    
Loss allowance provision, end of the year $ 3.7 $ 2.8
1–30    
Disclosure of provision matrix [line items]    
Expected loss rate 0.12% 0.10%
1–30 | Cost    
Disclosure of provision matrix [line items]    
Gross carrying amount $ 864.7 $ 914.7
1–30 | Accumulated impairment    
Disclosure of provision matrix [line items]    
Loss allowance provision, end of the year $ 1.3 $ 1.1
31–60    
Disclosure of provision matrix [line items]    
Expected loss rate 0.16% 0.13%
31–60 | Cost    
Disclosure of provision matrix [line items]    
Gross carrying amount $ 160.3 $ 221.1
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 0.38% 0.30%
61–90 | Cost    
Disclosure of provision matrix [line items]    
Gross carrying amount $ 60.9 $ 63.5
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 0.76% 0.59%
91–120 | Cost    
Disclosure of provision matrix [line items]    
Gross carrying amount $ 25.9 $ 27.8
91–120 | Accumulated impairment    
Disclosure of provision matrix [line items]    
Loss allowance provision, end of the year $ 0.3 $ 0.3
121+    
Disclosure of provision matrix [line items]    
Expected loss rate 1.52% 1.05%
121+ | Cost    
Disclosure of provision matrix [line items]    
Gross carrying amount $ 69.1 $ 81.2
121+ | Accumulated impairment    
Disclosure of provision matrix [line items]    
Loss allowance provision, end of the year $ 1.6 $ 1.0