ORGANIZATION AND BASIS OF PRESENTATION - Supplemental Cash Flow Information (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Cash paid for (received from):
Interest, net of amount capitalized	$ 178.9	$ 179.9
Income taxes, net of refunds	0.8	0.4
Right-of-use assets obtained in exchange for new operating lease liabilities	6.2	2.4
Right-of-use assets obtained in exchange for new finance lease liabilities	2.4	0.6
Non-cash investing transactions:
Property, plant and equipment additions	127.0	149.1
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	80.0	74.4
Income taxes, net of refunds	5.2	37.0
Right-of-use assets obtained in exchange for new operating lease liabilities	6.0	1.7
Right-of-use assets obtained in exchange for new finance lease liabilities	2.4	0.6
Non-cash investing transactions:
Property, plant and equipment additions	49.4	61.1
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	52.3	56.8
Income taxes, net of refunds	15.0	43.9
Right-of-use assets obtained in exchange for new operating lease liabilities	0.2	0.7
Non-cash investing transactions:
Property, plant and equipment additions	$ 45.0	$ 53.1