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MERGER OF GREAT PLAINS ENERGY AND EVERGY KANSAS CENTRAL - Purchase Price Allocation (Details) $ / shares in Units, $ in Millions | Jun. 04, 2018 USD ($) $ / shares shares
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Business Acquisition [Line Items] |
Common stock outstanding (in shares) | 215,800,074
Awards outstanding (in shares) | (204,825)
Great Plains Energy shares to be converted to Evergy shares (in shares) | 215,595,249
Great Plains Energy |
Business Acquisition [Line Items] |
Exchange ratio | 0.5981
Number of shares issued (in shares) | 128,947,518
Closing price (in dollars per share) | $ / shares | $ 54.00
Total purchase price | $ | $ 6,975.7
Common Stock | Great Plains Energy |
Business Acquisition [Line Items] |
Fair value of shares issued | $ | 6,963.2
Share-based Payment Arrangement | Great Plains Energy |
Business Acquisition [Line Items] |
Fair value of shares issued | $ | $ 12.5

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