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Equity Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Equity [Abstract]
Sale of stock, number of shares issued in transaction (in shares)	1,064,957	432,420	2,185,873	1,225,572
Proceeds from sale of common stock	$ 65.4	$ 20.1	$ 127.0	$ 57.3
Payments for commissions	$ 0.7	$ 0.2	$ 1.3	$ 0.6

X

- Definition

Proceeds From Sale Of Common Stock

+ References

No definition available.

+ Details

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Namespace Prefix:	cwt_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
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X

- Definition

The amount of cash paid for commissions during the current period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 25
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3536-108585

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X

- Definition

The number of shares issued or sold by the subsidiary or equity method investee per stock transaction.

+ References

No definition available.

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