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Financial Instruments - Summary of Loss Allowance Provision (Details) - CAD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Disclosure of provision matrix [line items]    
Loss allowance provision, end of the year $ 2.0 $ 3.0
Cost    
Disclosure of provision matrix [line items]    
Gross carrying amount 1,348.3 1,180.9
Accumulated impairment    
Disclosure of provision matrix [line items]    
Loss allowance provision, end of the year $ 2.6 $ 3.7
1–30    
Disclosure of provision matrix [line items]    
Expected loss rate 0.09% 0.12%
1–30 | Cost    
Disclosure of provision matrix [line items]    
Gross carrying amount $ 1,026.1 $ 864.7
1–30 | Accumulated impairment    
Disclosure of provision matrix [line items]    
Loss allowance provision, end of the year $ 1.1 $ 1.3
31–60    
Disclosure of provision matrix [line items]    
Expected loss rate 0.14% 0.16%
31–60 | Cost    
Disclosure of provision matrix [line items]    
Gross carrying amount $ 181.1 $ 160.3
31–60 | Accumulated impairment    
Disclosure of provision matrix [line items]    
Loss allowance provision, end of the year $ 0.2 $ 0.3
61–90    
Disclosure of provision matrix [line items]    
Expected loss rate 0.34% 0.38%
61–90 | Cost    
Disclosure of provision matrix [line items]    
Gross carrying amount $ 56.3 $ 60.9
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 0.73% 0.76%
91–120 | Cost    
Disclosure of provision matrix [line items]    
Gross carrying amount $ 30.7 $ 25.9
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 1.55% 1.52%
121+ | Cost    
Disclosure of provision matrix [line items]    
Gross carrying amount $ 54.1 $ 69.1
121+ | Accumulated impairment    
Disclosure of provision matrix [line items]    
Loss allowance provision, end of the year $ 0.9 $ 1.6