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v3.20.4

Provisions - Additional Information (Detail) $ in Millions |  | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jan. 01, 2020 CAD ($) | Sep. 30, 2020 CAD ($) yr | Dec. 31, 2019 CAD ($) | Dec. 31, 2018 CAD ($)
Disclosure of provision matrix [line items] |  |  |  |
Decommissioning liability, inflation factor rate |  | 2.00% | 2.00% |
Decommissioning liability, credit-adjusted rate |  | 9.00% | 7.00% |
Decommissioning liability, expected useful life | yr |  | 50 |  |
Decommissioning liability |  | $ 60.0 | $ 100.0 | $ 129.0
Office lease provision, credit-adjusted discount rate |  | 6.50% | 6.00% |
Office Lease Amendment Agreement [Member] | 2020 [member] |  |  |  |
Disclosure of provision matrix [line items] |  |  |  |
Lease rent monthly payment | $ 0.8 |  |  |
Lease rent annual payment | 10.0 |  |  |
Office Lease Amendment Agreement [Member] | 2021 [member] |  |  |  |
Disclosure of provision matrix [line items] |  |  |  |
Lease rent monthly payment | 0.8 |  |  |
Lease rent annual payment | 10.0 |  |  |
Office Lease Amendment Agreement [Member] | 2022 [member] |  |  |  |
Disclosure of provision matrix [line items] |  |  |  |
Lease rent monthly payment | 0.8 |  |  |
Lease rent annual payment | 10.0 |  |  |
Office Lease Amendment Agreement [Member] | 2023 [Member] |  |  |  |
Disclosure of provision matrix [line items] |  |  |  |
Lease rent monthly payment | 0.8 |  |  |
Lease rent annual payment | 10.0 |  |  |
Office Lease Amendment Agreement [Member] | 2024 [Member] |  |  |  |
Disclosure of provision matrix [line items] |  |  |  |
Lease rent monthly payment | 0.8 |  |  |
Lease rent annual payment | 10.0 |  |  |
Office Lease Amendment Agreement [Member] | 2025 [Member] |  |  |  |
Disclosure of provision matrix [line items] |  |  |  |
Lease rent monthly payment | 0.8 |  |  |
Lease rent annual payment | $ 10.0 |  |  |
Decommissioning liability on undiscounted uninflated basis [member] |  |  |  |
Disclosure of provision matrix [line items] |  |  |  |
Decommissioning liability |  | $ 605.0 | $ 621.0 |

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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- Definition The amount of provision for costs related to decommissioning, restoration and rehabilitation. [Refer: Other provisions] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 37 -IssueDate 2020-01-01 -Section D Examples: disclosures -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=37&code=ifrs-tx-2020-en-r&doctype=Illustrative%20Examples&dita_xref=IAS37_IE_D_TI -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 37 -IssueDate 2020-01-01 -Paragraph 87 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=37&code=ifrs-tx-2020-en-r&anchor=para_87&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition Decommissioning liability inflation factor rate. + References No definition available. + Details
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