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SCHEDULE I - CONDENSED FINANCIAL INFORMATION OF PARENT - Dividend from Subsidiaries (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Subsidiaries |  |  |
Dividends Payable [Line Items] |  |  |
Payments of Dividends from Subsidiaries | $ (56.4) | $ (38.3) | $ (47.3)

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- Definition Cash outflow from subsidiaries in the form of capital distributions and dividends to common shareholders, preferred shareholders and noncontrolling interests. + References No definition available. + Details
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Namespace Prefix: | awr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | srt_ConsolidatedEntitiesAxis=srt_SubsidiariesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |