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Commitments and contingencies (Details)
$ in Millions
Sep. 30, 2025
USD ($)
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