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Commitments and Contingencies - Gas Cost Adjustment NOPR (Details)
Jun. 30, 2021
Loss Contingencies [Line Items]  
recoverability of costs in excess of forecasted amount - low end 9000.00%
recoverability of costs in excess of forecasted amount - high end 9500.00%
Breckenridge Litigation  
Loss Contingencies [Line Items]  
Loss Contingency, Pending Claims, Number 3,000,000