REVENUE (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	$ 1,280.6	$ 1,246.9
Other	50.4	49.9
Revenues	1,331.0	1,296.8
Evergy Kansas Central
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	688.8	652.9
Other	4.4	25.7
Revenues	693.2	678.6
Evergy Metro
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	375.3	382.6
Other	45.6	23.8
Revenues	420.9	406.4
Residential
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	479.0	458.6
Residential | Evergy Kansas Central
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	214.3	192.1
Residential | Evergy Metro
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	156.0	158.0
Commercial
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	432.7	430.0
Commercial | Evergy Kansas Central
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	183.6	178.1
Commercial | Evergy Metro
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	171.2	175.9
Industrial
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	160.4	159.1
Industrial | Evergy Kansas Central
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	106.0	108.5
Industrial | Evergy Metro
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	31.2	28.4
Other retail
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	11.9	11.3
Other retail | Evergy Kansas Central
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	6.1	4.3
Other retail | Evergy Metro
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	3.2	2.7
Total electric retail
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	1,084.0	1,059.0
Total electric retail | Evergy Kansas Central
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	510.0	483.0
Total electric retail | Evergy Metro
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	361.6	365.0
Wholesale
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	71.0	70.4
Wholesale | Evergy Kansas Central
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	68.1	67.6
Wholesale | Evergy Metro
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	6.3	11.4
Transmission
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	115.4	105.8
Transmission | Evergy Kansas Central
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	108.9	100.6
Transmission | Evergy Metro
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	4.9	3.8
Industrial steam and other
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	10.2	11.7
Industrial steam and other | Evergy Kansas Central
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	1.8	1.7
Industrial steam and other | Evergy Metro
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	$ 2.5	$ 2.4