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Merger of Great Plains Energy and Westar Energy - Unaudited Pro Forma Financial Information (Details) - Great Plains Energy [Member] - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Business Acquisition [Line Items]        
Operating revenues $ 1,582.5 $ 1,651.5 $ 4,134.8 $ 4,086.7
Net income attributable to Evergy, Inc. $ 360.2 $ 321.8 $ 694.5 $ 543.3
Basic earnings per common share (in dollars per share) $ 1.34 $ 1.19 $ 2.56 $ 2.00
Diluted earnings per common share (in dollars per share) $ 1.34 $ 1.19 $ 2.55 $ 2.00