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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Other Income (Expense) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Other Income Expense Net [Line Items] |  |  |
Non-service cost component of net benefit cost | $ (51.2) | $ (62.9) | $ (55.6)
Other | (23.9) | (34.4) | (31.8)
Other expense | (75.1) | (97.3) | (87.4)
Evergy Kansas Central |  |  |
Other Income Expense Net [Line Items] |  |  |
Non-service cost component of net benefit cost | (17.6) | (17.1) | (15.6)
Other | (21.1) | (22.5) | (20.3)
Other expense | (38.7) | (39.6) | (35.9)
Evergy Metro |  |  |
Other Income Expense Net [Line Items] |  |  |
Non-service cost component of net benefit cost | (24.8) | (31.0) | (26.7)
Other | (2.2) | (2.9) | (2.7)
Other expense | $ (27.0) | $ (33.9) | $ (29.4)

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- Definition Amount of expense related to nonoperating activities, classified as other. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.9) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483621/220-10-S99-2 + Details
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