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LONG-TERM DEBT - Scheduled Maturities (Details) $ in Millions	Dec. 31, 2023 USD ($)
Debt Instrument [Line Items]
2024	$ 800.0
2025	636.0
2026	429.5
2027	2,021.9
2028	0.0
Evergy Kansas Central
Debt Instrument [Line Items]
2024	0.0
2025	250.0
2026	350.0
2027	321.9
2028	0.0
Evergy Metro
Debt Instrument [Line Items]
2024	0.0
2025	350.0
2026	79.5
2027	0.0
2028	$ 0.0

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