Commitments and contingencies (Details) $ in Millions |
Jun. 30, 2025
USD ($)
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| Firm Sale and Transportation Commitments | |
| Unrecorded Unconditional Purchase Obligation [Line Items] | |
| Future commitments | $ 77.2 |
| Fixed Supply of Electricity Purchase Commitments | |
| Unrecorded Unconditional Purchase Obligation [Line Items] | |
| Purchase obligation | 228.4 |
| Purchase Commitments | |
| Unrecorded Unconditional Purchase Obligation [Line Items] | |
| Purchase obligation | $ 31.1 |
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- Definition Minimum amount of purchase arrangement in which the entity has agreed to expend funds to procure goods or services from a supplier. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Amount of unrecorded obligation to transfer funds in future for fixed or minimum amount or quantity of product and service at fixed or minimum price. Includes, but is not limited to, lease not yet commenced and take-or-pay and throughput contracts. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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