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Commitments and contingencies (Details) $ in Millions | Sep. 30, 2025 USD ($)
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Firm Sale and Transportation Commitments |
Unrecorded Unconditional Purchase Obligation [Line Items] |
Future commitments | $ 69.8
Fixed Supply of Electricity Purchase Commitments |
Unrecorded Unconditional Purchase Obligation [Line Items] |
Purchase obligation | 217.0
Purchase Commitments |
Unrecorded Unconditional Purchase Obligation [Line Items] |
Purchase obligation | $ 26.9

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