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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Allowance For Funds Used During Construction (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Property, Plant and Equipment [Line Items]
AFUDC borrowed funds	$ 39.3	$ 15.8	$ 14.7
AFUDC equity funds	10.8	22.5	29.4
Total	50.1	38.3	44.1
Evergy Kansas Central
Property, Plant and Equipment [Line Items]
AFUDC borrowed funds	22.2	6.9	7.1
AFUDC equity funds	6.4	8.5	14.9
Total	$ 28.6	$ 15.4	$ 22.0
Public utilities, allowance for funds used during construction, rate	5.70%	3.10%	4.90%
Evergy Metro
Property, Plant and Equipment [Line Items]
AFUDC borrowed funds	$ 11.8	$ 6.5	$ 6.0
AFUDC equity funds	4.4	14.2	12.6
Total	$ 16.2	$ 20.7	$ 18.6
Public utilities, allowance for funds used during construction, rate	5.20%	5.70%	5.60%
Evergy Missouri West
Property, Plant and Equipment [Line Items]
Public utilities, allowance for funds used during construction, rate	5.60%	2.30%	2.60%

X

- Definition

The component of the allowance for funds used during construction during the period based on the interest rate on borrowed funds used in financing the construction of regulated assets.

+ References

No definition available.

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- Definition

Total increase in earnings in the period representing the cost of equity (based on assumed rate of return) and/or borrowed funds (based on interest rate) used to finance construction of regulated assets, which is expected to be recovered through rate adjustments.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 45
-Paragraph 28
-Subparagraph (b)
-SubTopic 10
-Topic 230
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482740/230-10-45-28

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 980
-SubTopic 360
-Section 25
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481711/980-360-25-1

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-Name Accounting Standards Codification
-Topic 980
-SubTopic 340
-Section 50
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481878/980-340-50-3

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The component of the allowance for funds used during construction during the period based on an assumed rate of return on equity funds used in financing the construction of regulated assets.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 980
-SubTopic 835
-Section 25
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481668/980-835-25-1

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- Definition

Effective rate, including composite rate, of cost of financing additions to qualifying regulated assets, commonly called allowance for funds used during construction.

+ References

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-Name Accounting Standards Codification
-Topic 980
-SubTopic 835
-Section 25
-Paragraph 1
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