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SCHEDULE I - CONDENSED FINANCIAL INFORMATION OF PARENT - Dividend from Subsidiaries (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Subsidiaries
Dividends Payable [Line Items]
Payments of dividends from subsidiaries	$ (51.1)	$ (71.4)	$ (56.4)

X

- 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

Name:	awr_PaymentsOfDividendsFromSubsidiaries
Namespace Prefix:	awr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- 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

Name:	us-gaap_DividendsPayableLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

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