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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Income      
Net income $ 743.6 $ 765.0 $ 891.9
Less: Net income attributable to noncontrolling interests 12.3 12.3 12.2
Net income attributable to Evergy, Inc. $ 731.3 $ 752.7 $ 879.7
Common Shares Outstanding      
Weighted average number of common shares outstanding - basic (in shares) 230.0 229.9 229.0
Add: effect of dilutive securities (in shares) 0.5 0.4 0.6
Diluted average number of common shares outstanding (in shares) 230.5 230.3 229.6
Basic earnings per common share (in dollars per share) $ 3.18 $ 3.27 $ 3.84
Diluted EPS (in dollars per share) $ 3.17 $ 3.27 $ 3.83