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FAIR VALUE MEASUREMENTS - Narrative (Details) - USD ($) $ in Millions	1 Months Ended	10 Months Ended	12 Months Ended
	Sep. 30, 2019	Sep. 30, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Payment for settlement of interest rate swap accounted for as a cash flow hedge	$ 69.8		$ 0.0	$ 69.8	$ 0.0
Notional amount	500.0	$ 500.0
Other comprehensive loss		69.8	0.0	64.4	5.4
Interest expense			(383.9)	(374.0)	(279.6)
Income tax benefit			(102.2)	(97.0)	$ (59.0)
Accumulated other comprehensive loss over the next twelve months			5.4
Senior Notes Due 2029 Evergy | Senior Notes
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Debt issued	$ 800.0	$ 800.0
Interest rate	2.90%	2.90%
Debt instrument, term		10 years
Reclassification out of Accumulated Other Comprehensive Income | Accumulated Gain (Loss), Cash Flow Hedge, Including Noncontrolling Interest
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Interest expense			7.0	2.0
Income tax benefit			$ (4.0)	$ (0.5)

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