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Foreign exchange rate used to translate amounts denominated in functional currency to reporting currency.

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Estimated amount of loss resulting from an adverse tax position.

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Minimum amount of purchase arrangement in which the entity has agreed to expend funds to procure goods or services from a supplier.

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Commitments and Contingencies (Narrative) (Details) kr in Millions, $ in Millions, $ in Millions	6 Months Ended		8 Months Ended	21 Months Ended	39 Months Ended	48 Months Ended
	Sep. 30, 2026 SEK (kr)	Sep. 30, 2026 USD ($)	Dec. 31, 2021 CAD ($)	Mar. 31, 2023 CAD ($)	Mar. 31, 2025 CAD ($)	Dec. 31, 2024 CAD ($)	Jun. 30, 2021 CAD ($)	Jun. 30, 2026	Mar. 31, 2026 USD ($)
Other Commitments [Line Items]
Provision for regulatory liabilities	kr 822.0	$ 84.7
Provision for regulatory liabilities, adjusted for surcharges and interest	845.0	$ 84.5
Exchange rate		10						9.71
Income tax assessment				$ 4.0		$ 5.6
Disallowed input tax credits being disputed							$ 0.6
GST/HST reassessment			$ 4.2
Proposed GST/HST adjustments					$ 56.8
Power purchase agreement [Member]
Other Commitments [Line Items]
Purchase commitments		$ 236.2							$ 29.1
STA has issued a decision [Member]
Other Commitments [Line Items]
Provision for regulatory liabilities \| kr	792.6
No decision has yet been issued [Member]
Other Commitments [Line Items]
Provision for regulatory liabilities \| kr	52.4
Bikupa Real Estate AB [Member]
Other Commitments [Line Items]
Provision for regulatory liabilities	kr 5.2	$ 0.5