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MERGER OF GREAT PLAINS ENERGY AND EVERGY KANSAS CENTRAL - Narrative (Details) $ in Millions		12 Months Ended
	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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Anticipated Acquisition Of Westar Energy, Inc.

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Business Acquisition, Conversion Ratio

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This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 25
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This element represents the amount of earnings or loss of the acquiree since the acquisition date included in the consolidated income statement for the reporting period.

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This element represents the amount of revenue of the acquiree since the acquisition date included in the consolidated income statement for the reporting period.

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