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Fair Value Measurements - Summary of Fair Value Hierarchy for Liabilities (Details) - CAD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Disclosure of fair value measurement of liabilities [line items] |  |
Liabilities | $ 2,459.6 | $ 2,684.4
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 | 299.5 |
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 | 68.8 |
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 | 297.8 |
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 | 69.5 |
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 |

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