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REVENUE (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disaggregation of Revenue [Line Items]                      
Total revenue from contracts with customers                 $ 4,781.6 $ 5,019.6 $ 4,224.0
Other                 131.8 128.2 51.9
Operating revenues $ 1,094.4 $ 1,517.6 $ 1,184.7 $ 1,116.7 $ 1,131.6 $ 1,577.6 $ 1,221.7 $ 1,216.9 4,913.4 5,147.8 4,275.9
Evergy Kansas Central                      
Disaggregation of Revenue [Line Items]                      
Total revenue from contracts with customers                 2,369.4 2,444.3 2,606.6
Other                 48.7 63.1 8.3
Operating revenues 553.6 733.6 570.8 560.1 576.1 749.0 585.5 596.8 2,418.1 2,507.4 2,614.9
Evergy Metro                      
Disaggregation of Revenue [Line Items]                      
Total revenue from contracts with customers                 1,623.8 1,742.9 1,752.0
Other                 81.8 63.6 71.1
Operating revenues $ 377.3 $ 528.5 $ 424.3 $ 375.5 $ 375.3 $ 568.8 $ 437.0 $ 425.4 1,705.6 1,806.5 1,823.1
Residential                      
Disaggregation of Revenue [Line Items]                      
Total revenue from contracts with customers                 1,909.2 1,908.1 1,578.8
Residential | Evergy Kansas Central                      
Disaggregation of Revenue [Line Items]                      
Total revenue from contracts with customers                 801.2 793.9 846.4
Residential | Evergy Metro                      
Disaggregation of Revenue [Line Items]                      
Total revenue from contracts with customers                 714.7 712.4 735.6
Commercial                      
Disaggregation of Revenue [Line Items]                      
Total revenue from contracts with customers                 1,641.7 1,781.6 1,356.4
Commercial | Evergy Kansas Central                      
Disaggregation of Revenue [Line Items]                      
Total revenue from contracts with customers                 665.6 709.1 702.8
Commercial | Evergy Metro                      
Disaggregation of Revenue [Line Items]                      
Total revenue from contracts with customers                 717.1 786.1 794.8
Industrial                      
Disaggregation of Revenue [Line Items]                      
Total revenue from contracts with customers                 588.7 621.6 527.8
Industrial | Evergy Kansas Central                      
Disaggregation of Revenue [Line Items]                      
Total revenue from contracts with customers                 379.9 401.3 396.4
Industrial | Evergy Metro                      
Disaggregation of Revenue [Line Items]                      
Total revenue from contracts with customers                 128.8 136.9 138.8
Other retail                      
Disaggregation of Revenue [Line Items]                      
Total revenue from contracts with customers                 38.5 47.1 30.6
Other retail | Evergy Kansas Central                      
Disaggregation of Revenue [Line Items]                      
Total revenue from contracts with customers                 17.7 21.0 20.0
Other retail | Evergy Metro                      
Disaggregation of Revenue [Line Items]                      
Total revenue from contracts with customers                 11.7 16.3 10.4
Total electric retail                      
Disaggregation of Revenue [Line Items]                      
Total revenue from contracts with customers                 4,178.1 4,358.4 3,493.6
Total electric retail | Evergy Kansas Central                      
Disaggregation of Revenue [Line Items]                      
Total revenue from contracts with customers                 1,864.4 1,925.3 1,965.6
Total electric retail | Evergy Metro                      
Disaggregation of Revenue [Line Items]                      
Total revenue from contracts with customers                 1,572.3 1,651.7 1,679.6
Wholesale                      
Disaggregation of Revenue [Line Items]                      
Total revenue from contracts with customers                 264.0 327.5 404.4
Wholesale | Evergy Kansas Central                      
Disaggregation of Revenue [Line Items]                      
Total revenue from contracts with customers                 215.4 239.9 346.1
Wholesale | Evergy Metro                      
Disaggregation of Revenue [Line Items]                      
Total revenue from contracts with customers                 35.0 70.9 53.5
Transmission                      
Disaggregation of Revenue [Line Items]                      
Total revenue from contracts with customers                 318.5 309.2 308.1
Transmission | Evergy Kansas Central                      
Disaggregation of Revenue [Line Items]                      
Total revenue from contracts with customers                 287.3 273.3 288.9
Transmission | Evergy Metro                      
Disaggregation of Revenue [Line Items]                      
Total revenue from contracts with customers                 13.9 17.5 14.5
Industrial steam and other                      
Disaggregation of Revenue [Line Items]                      
Total revenue from contracts with customers                 21.0 24.5 17.9
Industrial steam and other | Evergy Kansas Central                      
Disaggregation of Revenue [Line Items]                      
Total revenue from contracts with customers                 2.3 5.8 6.0
Industrial steam and other | Evergy Metro                      
Disaggregation of Revenue [Line Items]                      
Total revenue from contracts with customers                 $ 2.6 $ 2.8 $ 4.4