COMMITMENTS AND CONTINGENCIES - Contractual Commitments (Details) $ in Millions	Dec. 31, 2023 USD ($)
Unrecorded Unconditional Purchase Obligations and Lease Commitments [Line Items]
2024	$ 298.5
2025	242.1
2026	241.7
2027	151.9
2028	138.8
After 2028	324.1
Total	1,397.1
Fuel
Unrecorded Unconditional Purchase Obligations and Lease Commitments [Line Items]
2024	240.5
2025	183.7
2026	183.3
2027	93.5
2028	81.7
After 2028	145.8
Total	928.5
Power
Unrecorded Unconditional Purchase Obligations and Lease Commitments [Line Items]
2024	58.0
2025	58.4
2026	58.4
2027	58.4
2028	57.1
After 2028	178.3
Total	468.6
Evergy Kansas Central
Unrecorded Unconditional Purchase Obligations and Lease Commitments [Line Items]
2024	152.1
2025	108.7
2026	111.1
2027	54.7
2028	43.7
After 2028	72.3
Total	542.6
Evergy Kansas Central \| Fuel
Unrecorded Unconditional Purchase Obligations and Lease Commitments [Line Items]
2024	151.2
2025	107.8
2026	110.2
2027	53.8
2028	42.8
After 2028	71.0
Total	536.8
Evergy Kansas Central \| Power
Unrecorded Unconditional Purchase Obligations and Lease Commitments [Line Items]
2024	0.9
2025	0.9
2026	0.9
2027	0.9
2028	0.9
After 2028	1.3
Total	5.8
Evergy Metro
Unrecorded Unconditional Purchase Obligations and Lease Commitments [Line Items]
2024	107.7
2025	97.4
2026	94.5
2027	64.7
2028	68.1
After 2028	183.3
Total	615.7
Evergy Metro \| Fuel
Unrecorded Unconditional Purchase Obligations and Lease Commitments [Line Items]
2024	78.5
2025	68.2
2026	65.3
2027	35.5
2028	38.9
After 2028	74.8
Total	361.2
Evergy Metro \| Power
Unrecorded Unconditional Purchase Obligations and Lease Commitments [Line Items]
2024	29.2
2025	29.2
2026	29.2
2027	29.2
2028	29.2
After 2028	108.5
Total	$ 254.5

Amount of fixed and determinable portion of unrecorded unconditional purchase obligation to be paid in fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 440
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482648/440-10-50-4

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- Definition

Amount of fixed and determinable portion of unrecorded unconditional purchase obligation to be paid in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

+ Details

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- Definition

Amount of fixed and determinable portion of unrecorded unconditional purchase obligation to be paid in fourth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

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- Definition

Amount of fixed and determinable portion of unrecorded unconditional purchase obligation to be paid in second fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

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- Definition

Amount of fixed and determinable portion of unrecorded unconditional purchase obligation to be paid in third fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

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- Definition

Amount of the unrecorded obligation to transfer funds in the future for fixed or minimum amounts or quantities of goods or services at fixed or minimum prices (for example, as in take-or-pay contracts or throughput contracts).

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- Definition

Amount of fixed and determinable portion of unrecorded unconditional purchase obligation to be paid after fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 440
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482648/440-10-50-4

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- 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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 440
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482648/440-10-50-4

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 440
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482648/440-10-50-4

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 440
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482648/440-10-50-4

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