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Regulatory Matters - Narative (Details)
 3 Months Ended
Mar. 31, 2022
USD ($)
Regulatory matters:  
Regulatory asset not accruing carrying costs $ (63,100,000)
Amount billed to customers as surcharges 0
Water Revenue Adjustment Mechanism and Modified Cost Balancing Account  
Regulatory matters:  
Increase (decrease) in other regulatory assets $ 8,800,000
Regulatory asset recovery periods 24 months
Excess deferred income taxes  
Regulatory matters:  
Regulatory asset not accruing carrying costs $ (76,700,000)
Flow-through taxes, net  
Regulatory matters:  
Regulatory asset not accruing carrying costs (5,800,000)
Pension and other post-retirement obligations  
Regulatory matters:  
Regulatory asset not accruing carrying costs (25,100,000)
Derivative unrealized (gain) loss  
Regulatory matters:  
Regulatory asset not accruing carrying costs $ (7,000,000)
GSWC  
Regulatory matters:  
Number of unresolved issues for the Water General Rate Case 3
GSWC | Cost of capital proceeding  
Regulatory matters:  
Average cost of debt rate requested (percent) 5.10%
Average cost of debt rate, current (percent) 6.60%
Revenue impact due to lower cost of debt $ (1,400,000)
GSWC | Water Revenue Adjustment Mechanism and Modified Cost Balancing Account  
Regulatory matters:  
Commercial paper, term 90 days
BVESI  
Regulatory matters:  
Regulatory asset CEMA - storm $ 448,000