ORGANIZATION AND BASIS OF PRESENTATION - Supplemental Cash Flow Information (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Cash paid for (received from):
Interest, net of amount capitalized	$ 305.5	$ 257.0
Income taxes, net of refunds	8.0	1.7
Right-of-use assets obtained in exchange for new operating lease liabilities	8.2	8.1
Right-of-use assets obtained in exchange for new finance lease liabilities	7.0	0.6
Non-cash investing transactions:
Property, plant and equipment additions	128.6	184.8
Non-cash financing transactions:
Issuance of stock for compensation and reinvested dividends	0.0	0.7
Variable Interest Entities
Cash paid for (received from):
Interest of VIEs	0.0	0.2
Evergy Kansas Central
Cash paid for (received from):
Interest, net of amount capitalized	130.9	105.8
Income taxes, net of refunds	43.1	37.2
Right-of-use assets obtained in exchange for new operating lease liabilities	8.0	3.6
Right-of-use assets obtained in exchange for new finance lease liabilities	7.0	0.6
Non-cash investing transactions:
Property, plant and equipment additions	51.7	64.6
Evergy Kansas Central | Variable Interest Entities
Cash paid for (received from):
Interest of VIEs	0.0	0.2
Evergy Metro
Cash paid for (received from):
Interest, net of amount capitalized	84.3	73.3
Income taxes, net of refunds	(0.4)	66.8
Right-of-use assets obtained in exchange for new operating lease liabilities	0.2	4.5
Non-cash investing transactions:
Property, plant and equipment additions	$ 53.7	$ 75.2