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Fair Value Measurements - Schedule of Fair Value Hierarchy for Liabilities (Details) - CAD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Disclosure of fair value measurement of liabilities [line items]    
Liabilities $ 3,320.1 $ 3,366.9
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 547.6 298.6
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 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 523.2 259.8
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 $ 0.0