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Fair Value Measurements - Schedule of Fair Value Hierarchy for Liabilities (Details) - CAD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Jan. 01, 2023
 [1]
Disclosure of fair value measurement of liabilities [line items]      
Liabilities $ 4,011.0 $ 3,315.2 [1] $ 3,347.3
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 548.1 547.6  
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 548.2 523.2  
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  
[1] Revised for change in accounting policy (see Note 6.c)