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MERGER OF GREAT PLAINS ENERGY AND EVERGY KANSAS CENTRAL - Narrative (Details) $ in Millions |  | 12 Months Ended
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Jun. 04, 2018 | Dec. 31, 2018 USD ($)
Evergy Kansas Central |  |
Anticipated Merger With Westar Energy, Inc. [Line Items] |  |
Conversion ratio | 1 |
Great Plains Energy |  |
Anticipated Merger With Westar Energy, Inc. [Line Items] |  |
Conversion ratio | 0.5981 |
Revenue of acquiree since acquisition |  | $ 1,661.1
Earnings or loss of acquiree since acquisition date, actual |  | 236.2
Merger-related costs |  | $ 148.0

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