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Fair Value - Natural Gas Derivatives (Details) - Not designated as hedging instrument - Natural Gas Fixed Price Forward Contracts
MMBTU in Thousands, $ in Millions
12 Months Ended
Dec. 31, 2022
USD ($)
MMBTU
Dec. 31, 2021
USD ($)
MMBTU
Fair Value, Option, Quantitative Disclosures [Line Items]    
Number of Contracts (MMBTU) | MMBTU 0 88
Derivative liability | $ $ 0.0 $ 0.0