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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

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