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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Allowance For Funds Used During Construction (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Property, Plant and Equipment [Line Items]
AFUDC borrowed funds	$ 16.5	$ 14.5	$ 10.4
AFUDC equity funds	17.2	2.2	3.1
Total	33.7	16.7	13.5
Evergy Kansas Central
Property, Plant and Equipment [Line Items]
AFUDC borrowed funds	8.5	7.5	6.6
AFUDC equity funds	9.1	0.0	2.9
Total	$ 17.6	$ 7.5	$ 9.5
Public utilities, allowance for funds used during construction, rate	4.70%	3.00%	3.30%
Evergy Metro
Property, Plant and Equipment [Line Items]
AFUDC borrowed funds	$ 6.0	$ 4.3	$ 4.9
AFUDC equity funds	8.0	2.2	1.4
Total	$ 14.0	$ 6.5	$ 6.3
Public utilities, allowance for funds used during construction, rate	5.20%	4.60%	3.90%
Evergy Missouri West
Property, Plant and Equipment [Line Items]
Public utilities, allowance for funds used during construction, rate	3.50%	3.70%	2.90%

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

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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.

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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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
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-Name Accounting Standards Codification
-Topic 980
-SubTopic 340
-Section 50
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-Section 25
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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.

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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.

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