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Financial and Other Derivative Instruments (Cumulative Gross Volume of Derivative Contracts) (Details) - 9 months ended Sep. 30, 2025 | CAD ($) MWh MMBTU T | USD ($)
--- | --- | ---
Natural gas (MMBtu) |  |
Derivative [Line Items] |  |
Commodity, energy measures | MMBTU | 2,291,617,186 |
Electricity (MWh) |  |
Derivative [Line Items] |  |
Commodity, energy measures | 40,367,854 |
Foreign currency exchange ($ CAD) |  |
Derivative [Line Items] |  |
Commodity, monetary measure | $ | $ 74,745,468 |
FTR (MWh) |  |
Derivative [Line Items] |  |
Commodity, energy measures | 129,597 |
Renewable Energy Certificates (MWh) |  |
Derivative [Line Items] |  |
Commodity, energy measures | 13,426,465 |
Carbon emissions (Metric Tons) |  |
Derivative [Line Items] |  |
Commodity, mass measure | T | 1,655,907 |
Interest rate contracts ($ USD) |  |
Derivative [Line Items] |  |
Commodity, monetary measure | $ |  | $ 100,000,000

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