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Asset Retirement Obligations - Additional Information (Details) - Asset retirement obligation - CAD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
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Disclosure of other provisions [line items] |  |  |
Estimated cash flows, undiscounted amount | $ 721,000 | $ 714,800 |
Estimated inflation rate | 1.50% | 1.40% |
Estimated risk free rate | 1.20% | 1.80% |
Other provisions | $ 760,383 | $ 667,974 | $ 646,898

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