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RATE MATTERS AND REGULATION - Regulatory Matters Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Regulatory Liabilities [Line Items]
Regulatory liabilities	$ 2,725.5	$ 2,722.2
Less: current portion	(183.0)	(155.4)
Total noncurrent regulatory liabilities	2,542.5	2,566.8
Taxes refundable through future rates
Regulatory Liabilities [Line Items]
Regulatory liabilities	1,737.8	1,866.6
Deferred regulatory gain from sale leaseback
Regulatory Liabilities [Line Items]
Regulatory liabilities	31.6	37.1
Emission allowances
Regulatory Liabilities [Line Items]
Regulatory liabilities	34.2	38.2
Nuclear decommissioning
Regulatory Liabilities [Line Items]
Regulatory liabilities	318.7	246.3
Pension and post-retirement costs
Regulatory Liabilities [Line Items]
Regulatory liabilities	124.8	98.4
Jurisdictional allowance for funds used during construction
Regulatory Liabilities [Line Items]
Regulatory liabilities	24.4	25.9
La Cygne leasehold dismantling costs
Regulatory Liabilities [Line Items]
Regulatory liabilities	29.6	29.6
Kansas tax credits
Regulatory Liabilities [Line Items]
Regulatory liabilities	16.8	23.5
Purchase power agreement
Regulatory Liabilities [Line Items]
Regulatory liabilities	$ 3.7	4.1
Regulatory Liability, Amortization Period	5 years
Fuel recovery mechanisms
Regulatory Liabilities [Line Items]
Regulatory liabilities	$ 34.7	4.7
Regulatory Liability, Amortization Period	1 year
February 2021 winter weather event
Regulatory Liabilities [Line Items]
Regulatory liabilities	$ 13.0	37.8
Sibley AAO
Regulatory Liabilities [Line Items]
Regulatory liabilities	$ 79.2	108.0
Regulatory Liability, Amortization Period	4 years
TFR Refund
Regulatory Liabilities [Line Items]
Regulatory liabilities	$ 11.2	55.5
COLI rate credits refund
Regulatory Liabilities [Line Items]
Regulatory liabilities	$ 96.5	0.0
Regulatory Liability, Amortization Period	3 years
Phase-in plan
Regulatory Liabilities [Line Items]
Regulatory liabilities	$ 38.1	25.1
Other regulatory liabilities
Regulatory Liabilities [Line Items]
Regulatory liabilities	131.2	121.4
Evergy Kansas Central
Regulatory Liabilities [Line Items]
Regulatory liabilities	1,536.5	1,441.0
Less: current portion	(104.1)	(72.1)
Total noncurrent regulatory liabilities	1,432.4	1,368.9
Evergy Kansas Central | Taxes refundable through future rates
Regulatory Liabilities [Line Items]
Regulatory liabilities	1,047.2	1,084.2
Evergy Kansas Central | Deferred regulatory gain from sale leaseback
Regulatory Liabilities [Line Items]
Regulatory liabilities	31.6	37.1
Evergy Kansas Central | Emission allowances
Regulatory Liabilities [Line Items]
Regulatory liabilities	0.0	0.0
Evergy Kansas Central | Nuclear decommissioning
Regulatory Liabilities [Line Items]
Regulatory liabilities	125.5	103.4
Evergy Kansas Central | Pension and post-retirement costs
Regulatory Liabilities [Line Items]
Regulatory liabilities	21.9	23.0
Evergy Kansas Central | Jurisdictional allowance for funds used during construction
Regulatory Liabilities [Line Items]
Regulatory liabilities	22.7	24.2
Evergy Kansas Central | La Cygne leasehold dismantling costs
Regulatory Liabilities [Line Items]
Regulatory liabilities	29.6	29.6
Evergy Kansas Central | Kansas tax credits
Regulatory Liabilities [Line Items]
Regulatory liabilities	16.8	23.5
Evergy Kansas Central | Purchase power agreement
Regulatory Liabilities [Line Items]
Regulatory liabilities	3.7	4.1
Evergy Kansas Central | Fuel recovery mechanisms
Regulatory Liabilities [Line Items]
Regulatory liabilities	34.7	4.5
Evergy Kansas Central | February 2021 winter weather event
Regulatory Liabilities [Line Items]
Regulatory liabilities	0.0	0.0
Evergy Kansas Central | Sibley AAO
Regulatory Liabilities [Line Items]
Regulatory liabilities	0.0	0.0
Evergy Kansas Central | TFR Refund
Regulatory Liabilities [Line Items]
Regulatory liabilities	11.2	55.5
Evergy Kansas Central | COLI rate credits refund
Regulatory Liabilities [Line Items]
Regulatory liabilities	96.5	0.0
Evergy Kansas Central | Phase-in plan
Regulatory Liabilities [Line Items]
Regulatory liabilities	38.1	25.1
Evergy Kansas Central | Other regulatory liabilities
Regulatory Liabilities [Line Items]
Regulatory liabilities	57.0	26.8
Evergy Metro
Regulatory Liabilities [Line Items]
Regulatory liabilities	903.2	928.1
Less: current portion	(43.0)	(55.3)
Total noncurrent regulatory liabilities	860.2	872.8
Evergy Metro | Taxes refundable through future rates
Regulatory Liabilities [Line Items]
Regulatory liabilities	519.2	586.6
Evergy Metro | Deferred regulatory gain from sale leaseback
Regulatory Liabilities [Line Items]
Regulatory liabilities	0.0	0.0
Evergy Metro | Emission allowances
Regulatory Liabilities [Line Items]
Regulatory liabilities	34.2	38.2
Evergy Metro | Nuclear decommissioning
Regulatory Liabilities [Line Items]
Regulatory liabilities	193.2	142.9
Evergy Metro | Pension and post-retirement costs
Regulatory Liabilities [Line Items]
Regulatory liabilities	100.5	72.5
Evergy Metro | Jurisdictional allowance for funds used during construction
Regulatory Liabilities [Line Items]
Regulatory liabilities	1.7	1.7
Evergy Metro | La Cygne leasehold dismantling costs
Regulatory Liabilities [Line Items]
Regulatory liabilities	0.0	0.0
Evergy Metro | Kansas tax credits
Regulatory Liabilities [Line Items]
Regulatory liabilities	0.0	0.0
Evergy Metro | Purchase power agreement
Regulatory Liabilities [Line Items]
Regulatory liabilities	0.0	0.0
Evergy Metro | Fuel recovery mechanisms
Regulatory Liabilities [Line Items]
Regulatory liabilities	0.0	0.2
Evergy Metro | February 2021 winter weather event
Regulatory Liabilities [Line Items]
Regulatory liabilities	13.0	37.8
Evergy Metro | Sibley AAO
Regulatory Liabilities [Line Items]
Regulatory liabilities	0.0	0.0
Evergy Metro | TFR Refund
Regulatory Liabilities [Line Items]
Regulatory liabilities	0.0	0.0
Evergy Metro | COLI rate credits refund
Regulatory Liabilities [Line Items]
Regulatory liabilities	0.0	0.0
Evergy Metro | Phase-in plan
Regulatory Liabilities [Line Items]
Regulatory liabilities	0.0	0.0
Evergy Metro | Other regulatory liabilities
Regulatory Liabilities [Line Items]
Regulatory liabilities	$ 41.4	$ 48.2

X

- Definition

The amount for the individual regulatory liability as itemized in a table of regulatory liabilities as of the end of the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 980
-SubTopic 405
-Name Accounting Standards Codification
-Section 25
-Paragraph 1
-Publisher FASB
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+ References

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-Name Accounting Standards Codification
-Section 25
-Paragraph 1
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+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.24)
-Publisher FASB
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