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REVENUE (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2022
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers   $ 5,345.1 $ 5,589.2 $ 5,329.1
Other   163.1 269.9 257.6
Revenues   5,508.2 5,859.1 5,586.7
Evergy Kansas Central        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers   2,645.2 2,983.7 2,705.2
Other   53.2 72.2 142.1
Revenues   2,698.4 3,055.9 2,847.3
Evergy Metro        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers   1,780.4 1,774.5 1,799.7
Other   108.6 196.1 114.0
Revenues   1,889.0 1,970.6 1,913.7
Residential        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers   2,036.7 2,168.2 1,918.3
Residential | Evergy Kansas Central        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers   821.0 980.1 824.1
Residential | Evergy Metro        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers   748.4 746.4 691.9
Commercial        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers   1,832.4 1,888.5 1,681.3
Commercial | Evergy Kansas Central        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers   722.9 822.9 694.1
Commercial | Evergy Metro        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers   778.9 758.6 713.3
Industrial        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers   625.9 686.2 597.0
Industrial | Evergy Kansas Central        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers   398.5 465.7 391.7
Industrial | Evergy Metro        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers   130.9 127.0 122.0
Other retail        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers   43.2 (32.1) 33.1
Deferral of revenues to regulatory liability for refund to customers for return on investment of retired Sibley Station $ 68.0   68.0  
Other retail | Evergy Kansas Central        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers   18.1 17.9 17.1
Other retail | Evergy Metro        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers   12.7 11.5 9.2
Total electric retail        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers   4,538.2 4,710.8 4,229.7
Total electric retail | Evergy Kansas Central        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers   1,960.5 2,286.6 1,927.0
Total electric retail | Evergy Metro        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers   1,670.9 1,643.5 1,536.4
Wholesale        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers   373.5 509.9 717.2
Wholesale | Evergy Kansas Central        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers   296.8 389.9 453.1
Wholesale | Evergy Metro        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers   91.9 111.9 242.6
Transmission        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers   403.2 343.7 356.8
Transmission | Evergy Kansas Central        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers   385.8 305.0 322.9
Transmission | Evergy Metro        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers   14.3 18.2 17.1
Industrial steam and other        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers   30.2 24.8 25.4
Industrial steam and other | Evergy Kansas Central        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers   2.1 2.2 2.2
Industrial steam and other | Evergy Metro        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers   $ 3.3 $ 0.9 $ 3.6