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MERGER OF GREAT PLAINS ENERGY AND EVERGY KANSAS CENTRAL - Unaudited Pro Forma Financial Information (Details) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2018 USD ($) $ / shares
Business Acquisition [Line Items]
Diluted earnings per common share (in dollars per share) | $ / shares	$ 2.67
Great Plains Energy
Business Acquisition [Line Items]
Operating revenues	$ 5,334.6
Net income attributable to Evergy, Inc.	$ 714.3
Basic earnings per common share (in dollars per share) | $ / shares	$ 2.67
Acquisition-related Costs
Business Acquisition [Line Items]
Merger-related, after tax costs	$ 74.7
Merger-related, reductions of revenues for customer bill credits	44.4
Merger contingent, after-tax mark-to-market interest rate swap gains	$ 36.6

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