Consolidated Statements of Changes in Equity - Evergy Kansas Central, Inc - USD ($) $ in Millions	Total	Common Stock	Retained earnings	Non-controlling interests	Evergy Kansas Central	Evergy Kansas Central Common Stock	Evergy Kansas Central Retained earnings	Evergy Kansas Central Non-controlling interests
Beginning balance (in shares) at Dec. 31, 2022		229,546,105				1
Beginning balance at Dec. 31, 2022	$ 9,493.3	$ 7,219.7	$ 2,298.5	$ 9.6	$ 4,507.4	$ 2,737.6	$ 1,760.2	$ 9.6
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	145.7		142.6	3.1	106.4		103.3	3.1
Dividends declared on common stock	(140.7)		(140.7)
Ending balance (in shares) at Mar. 31, 2023		229,676,699				1
Ending balance at Mar. 31, 2023	9,501.7	$ 7,222.2	2,300.0	12.7	4,613.8	$ 2,737.6	1,863.5	12.7
Beginning balance (in shares) at Dec. 31, 2023		229,729,296				1
Beginning balance at Dec. 31, 2023	9,685.0	$ 7,234.9	2,457.8	21.9	4,891.9	$ 2,737.6	2,132.4	21.9
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	125.8		122.7	3.1	111.6		108.5	3.1
Dividends declared on common stock	(147.7)		(147.7)
Ending balance (in shares) at Mar. 31, 2024		229,922,338				1
Ending balance at Mar. 31, 2024	$ 9,664.1	$ 7,235.0	$ 2,432.4	$ 25.0	$ 5,003.5	$ 2,737.6	$ 2,240.9	$ 25.0