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Revenues - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Mar. 31, 2023 | Jun. 30, 2023
Disaggregation of Revenue [Line Items] |  |  |
Revenue, remaining performance obligation, amount | $ 3,600.0 |  | $ 3,600.0
ASUS |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Period of fixed price contracts to operate and maintain water systems at various military bases |  |  | 50 years
ASUS | Minimum |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue, remaining performance obligation, expected timing of satisfaction, period | 31 years |  | 31 years
ASUS | Maximum |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue, remaining performance obligation, expected timing of satisfaction, period | 45 years |  | 45 years
GSWC | Cost of capital proceeding |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue impact due to lower cost of debt | $ 9.3 | $ 2.9 | $ 6.4
Contracted services: | ASUS |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Period of fixed price contracts to operate and maintain water systems at various military bases |  |  | 50 years
Electric: | Golden State Water Company and Bear Valley Electric Service Inc. | Sales | Customer Concentration Risk |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Concentration risk, percentage |  |  | 90.00%
Water: |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Retroactive water revenues impact as a result of a proposed decision |  |  | $ 30.0
Water: | GSWC | Sales | Customer Concentration Risk |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Concentration risk, percentage |  |  | 90.00%

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