REVENUE (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2023	Mar. 31, 2022
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	$ 1,246.9	$ 1,167.4
Other	49.9	56.5
Revenues	1,296.8	1,223.9
Evergy Kansas Central
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	652.9	604.4
Other	25.7	9.5
Revenues	678.6	613.9
Evergy Metro
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	382.6	376.2
Other	23.8	46.3
Revenues	406.4	422.5
Residential
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	458.6	451.8
Residential \| Evergy Kansas Central
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	192.1	196.1
Residential \| Evergy Metro
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	158.0	159.9
Commercial
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	430.0	403.1
Commercial \| Evergy Kansas Central
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	178.1	165.2
Commercial \| Evergy Metro
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	175.9	173.6
Industrial
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	159.1	150.3
Industrial \| Evergy Kansas Central
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	108.5	100.8
Industrial \| Evergy Metro
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	28.4	28.8
Other retail
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	11.3	9.0
Other retail \| Evergy Kansas Central
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	4.3	4.1
Other retail \| Evergy Metro
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	2.7	2.6
Total electric retail
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	1,059.0	1,014.2
Total electric retail \| Evergy Kansas Central
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	483.0	466.2
Total electric retail \| Evergy Metro
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	365.0	364.9
Wholesale
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	70.4	51.9
Wholesale \| Evergy Kansas Central
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	67.6	50.1
Wholesale \| Evergy Metro
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	11.4	7.7
Transmission
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	105.8	98.0
Transmission \| Evergy Kansas Central
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	100.6	87.5
Transmission \| Evergy Metro
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	3.8	5.4
Industrial steam and other
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	11.7	3.3
Industrial steam and other \| Evergy Kansas Central
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	1.7	0.6
Industrial steam and other \| Evergy Metro
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	$ 2.4	$ (1.8)