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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ 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
Income                      
Net income $ 54.0 $ 367.5 $ 136.3 $ 72.2 $ 66.7 $ 370.9 $ 144.6 $ 103.4 $ 630.0 $ 685.6 $ 546.0
Less: Net income attributable to noncontrolling interests                 11.7 15.7 10.2
Net income attributable to Evergy, Inc. $ 51.0 $ 364.5 $ 133.4 $ 69.4 $ 63.9 $ 366.8 $ 139.7 $ 99.5 $ 618.3 $ 669.9 $ 535.8
Common Shares Outstanding                      
Weighted average number of common shares outstanding - basic (in shares)                 227.2 239.5 213.9
Add: effect of dilutive securities (in shares)                 0.3 0.4 0.2
Diluted average number of common shares outstanding (in shares)                 227.5 239.9 214.1
Basic earnings per common share (in dollars per share)                 $ 2.72 $ 2.80 $ 2.50
Diluted EPS (in dollars per share)                 $ 2.72 $ 2.79 $ 2.50