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Fair Value Measurements - Unobservable Inputs for Level 3 Natural Gas Supply Contracts (Details) - Natural gas supply contracts	Jun. 30, 2026 $ / MMBTU
Forward natural gas price per MMBtu | Minimum | Discounted cash flow
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative, measurement input	2.07
Forward natural gas price per MMBtu | Maximum | Discounted cash flow
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative, measurement input	5.37
Forward natural gas price per MMBtu | Arithmetic average | Discounted cash flow
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative, measurement input	3.47
Volatility | Minimum | Option pricing model
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative, measurement input	0.192
Volatility | Maximum | Option pricing model
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative, measurement input	0.663
Volatility | Arithmetic average | Option pricing model
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative, measurement input	0.282

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Value of input used to measure net derivative asset (liability).

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