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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)

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