VARIABLE INTEREST ENTITIES - Assets and Liabilities Related to VIE (Details) - USD ($)	Mar. 31, 2024	Dec. 31, 2023
Assets:
Property, plant and equipment, net	$ 23,945,700,000	$ 23,728,700,000
Liabilities:
Accrued interest	177,000,000.0	134,200,000
Variable Interest Entities
Assets:
Property, plant and equipment, net	131,800,000	133,600,000
Liabilities:
Accrued interest	1,700,000
Evergy Kansas Central
Assets:
Property, plant and equipment, net	12,244,900,000	12,121,900,000
Liabilities:
Accrued interest	96,300,000	79,700,000
Evergy Kansas Central | Variable Interest Entities
Assets:
Property, plant and equipment, net	$ 131,800,000	$ 133,600,000