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Risk Management Activities - Maturity of Non-Hedges (Details) - 12 months ended Dec. 31, 2021 - Non-Hedges - Commodity risk management | CAD ($) $ / $ | CAD ($) $ / $ | AUD ($) | cADPerMegawattHour
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Foreign exchange forward contracts – foreign-denominated receipts/expenditures | 2022 |  |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |  |  |
Notional amount | $ 8,000,000 | $ 8,000,000 | $ 14,000,000 |
Average foreign exchange rate | 0.7893 | 0.7352 |  |
Foreign exchange forward contracts – foreign-denominated receipts/expenditures | 2023 |  |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |  |  |
Notional amount | $ 0 | $ 0 | 0 |
Average foreign exchange rate | 0 | 0 |  |
Foreign exchange forward contracts – foreign-denominated receipts/expenditures | 2024 |  |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |  |  |
Notional amount | $ 0 | $ 0 | 0 |
Average foreign exchange rate | 0 | 0 |  |
Foreign exchange forward contracts – foreign-denominated receipts/expenditures | 2025 |  |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |  |  |
Notional amount | $ 0 | $ 0 | 0 |
Average foreign exchange rate | 0 | 0 |  |
Foreign exchange forward contracts – foreign-denominated receipts/expenditures | 2026 |  |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |  |  |
Notional amount | $ 0 | $ 0 | 0 |
Average foreign exchange rate | 0 | 0 |  |
Foreign exchange forward contracts – foreign-denominated receipts/expenditures | More than five years |  |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |  |  |
Notional amount | $ 0 | $ 0 | $ 0 |
Average foreign exchange rate | 0 | 0 |  |
Electricity | 2022 |  |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |  |  |
Notional amount | $ | $ 3,329,000 | $ 3,329,000 |  |
Average power prices | cADPerMegawattHour |  |  |  | cADPerMegawattHour 71.95
Electricity | 2023 |  |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |  |  |
Notional amount | $ | 3,329,000 | 3,329,000 |  |
Average power prices | cADPerMegawattHour |  |  |  | 73.76
Electricity | 2024 |  |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |  |  |
Notional amount | $ | 3,338,000 | 3,338,000 |  |
Average power prices | cADPerMegawattHour |  |  |  | 75.6
Electricity | 2025 |  |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |  |  |
Notional amount | $ | 2,628,000 | 2,628,000 |  |
Average power prices | cADPerMegawattHour |  |  |  | 77.49
Electricity | 2026 |  |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |  |  |
Notional amount | $ | 0 | 0 |  |
Average power prices | cADPerMegawattHour |  |  |  | 0
Electricity | More than five years |  |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |  |  |
Notional amount | $ | $ 0 | $ 0 |  |
Average power prices | cADPerMegawattHour |  |  |  | cADPerMegawattHour 0

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