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Fair Value Measurements - Summary of Fair Value Hierarchy for Liabilities (Details) - CAD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Disclosure of fair value measurement of liabilities [line items]    
Liabilities $ 2,459.6 $ 2,684.4
Not measured at fair value in statement of financial position but for which fair value is disclosed | Senior unsecured notes    
Disclosure of fair value measurement of liabilities [line items]    
Liabilities 299.5  
Not measured at fair value in statement of financial position but for which fair value is disclosed | Notes payable    
Disclosure of fair value measurement of liabilities [line items]    
Liabilities 68.8  
Not measured at fair value in statement of financial position but for which fair value is disclosed | Level 1 | Senior unsecured notes    
Disclosure of fair value measurement of liabilities [line items]    
Liabilities 0.0  
Not measured at fair value in statement of financial position but for which fair value is disclosed | Level 1 | Notes payable    
Disclosure of fair value measurement of liabilities [line items]    
Liabilities 0.0  
Not measured at fair value in statement of financial position but for which fair value is disclosed | Level 2 | Senior unsecured notes    
Disclosure of fair value measurement of liabilities [line items]    
Liabilities 297.8  
Not measured at fair value in statement of financial position but for which fair value is disclosed | Level 2 | Notes payable    
Disclosure of fair value measurement of liabilities [line items]    
Liabilities 69.5  
Not measured at fair value in statement of financial position but for which fair value is disclosed | Level 3 | Senior unsecured notes    
Disclosure of fair value measurement of liabilities [line items]    
Liabilities 0.0  
Not measured at fair value in statement of financial position but for which fair value is disclosed | Level 3 | Notes payable    
Disclosure of fair value measurement of liabilities [line items]    
Liabilities $ 0.0