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ORGANIZATION AND BASIS OF PRESENTATION - Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Income
Net income	$ 103.4	$ 62.9
Less: Net income attributable to noncontrolling interests	3.9	2.4
Net income attributable to Evergy, Inc.	$ 99.5	$ 60.5
Common Shares Outstanding
Weighted average equivalent common shares outstanding - basic (in shares)	252.8	142.6
Add: effect of dilutive securities (in shares)	0.2	0.1
Diluted average number of common shares outstanding (in shares)	253.0	142.7
Basic and Diluted EPS (in dollars per share)	$ 0.39	$ 0.42

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The amount of net income or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements. Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period. Diluted earnings per share includes the amount of net income or loss for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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