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Fair Value Measurements - Summary of Fair Value Hierarchy for Liabilities (Details) - CAD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Disclosure of fair value measurement of liabilities [line items]    
Liabilities $ 3,224.2 $ 2,459.6
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 298.2  
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 64.7  
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 290.1  
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 64.7  
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