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, 2020		226,836,670				1
Beginning balance at Dec. 31, 2020	$ 8,718.5	$ 7,080.0	$ 1,702.8	$ (14.9)	$ 4,280.8	$ 2,737.6	$ 1,558.1	$ (14.9)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	194.6		191.6	3.0	181.1		178.1	3.0
Dividends declared on common stock	(121.4)		(121.4)
Ending balance (in shares) at Mar. 31, 2021		226,995,620				1
Ending balance at Mar. 31, 2021	8,794.4	$ 7,081.5	1,772.8	(11.9)	4,461.9	$ 2,737.6	1,736.2	(11.9)
Beginning balance (in shares) at Dec. 31, 2020		226,836,670				1
Beginning balance at Dec. 31, 2020	8,718.5	$ 7,080.0	1,702.8	(14.9)	4,280.8	$ 2,737.6	1,558.1	(14.9)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	835.4				461.4
Ending balance (in shares) at Sep. 30, 2021		229,301,079				1
Ending balance at Sep. 30, 2021	9,312.0	$ 7,201.8	2,161.3	(5.8)	4,572.2	$ 2,737.6	1,840.4	(5.8)
Beginning balance (in shares) at Mar. 31, 2021		226,995,620				1
Beginning balance at Mar. 31, 2021	8,794.4	$ 7,081.5	1,772.8	(11.9)	4,461.9	$ 2,737.6	1,736.2	(11.9)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	188.3		185.3	3.0	79.6		76.6	3.0
Dividends declared on common stock	(122.6)		(122.6)
Ending balance (in shares) at Jun. 30, 2021		229,296,214				1
Ending balance at Jun. 30, 2021	8,977.1	$ 7,197.6	1,835.0	(8.9)	4,541.5	$ 2,737.6	1,812.8	(8.9)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	452.5		449.4	3.1	200.7		197.6	3.1
Dividends declared on common stock	(122.7)		(122.7)		(170.0)		(170.0)
Ending balance (in shares) at Sep. 30, 2021		229,301,079				1
Ending balance at Sep. 30, 2021	9,312.0	$ 7,201.8	2,161.3	(5.8)	4,572.2	$ 2,737.6	1,840.4	(5.8)
Beginning balance (in shares) at Dec. 31, 2021		229,299,900				1
Beginning balance at Dec. 31, 2021	9,241.7	$ 7,205.5	2,082.9	(2.7)	4,541.5	$ 2,737.6	1,806.6	(2.7)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	125.6		122.5	3.1	75.1		72.0	3.1
Dividends declared on common stock	(131.3)		(131.3)		(25.0)		(25.0)
Ending balance (in shares) at Mar. 31, 2022		229,476,558				1
Ending balance at Mar. 31, 2022	9,237.5	$ 7,206.4	2,073.3	0.4	4,591.6	$ 2,737.6	1,853.6	0.4
Beginning balance (in shares) at Dec. 31, 2021		229,299,900				1
Beginning balance at Dec. 31, 2021	9,241.7	$ 7,205.5	2,082.9	(2.7)	4,541.5	$ 2,737.6	1,806.6	(2.7)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	754.4				381.8
Ending balance (in shares) at Sep. 30, 2022		229,532,136				1
Ending balance at Sep. 30, 2022	9,615.5	$ 7,216.6	2,432.2	6.5	4,538.3	$ 2,737.6	1,794.2	6.5
Beginning balance (in shares) at Mar. 31, 2022		229,476,558				1
Beginning balance at Mar. 31, 2022	9,237.5	$ 7,206.4	2,073.3	0.4	4,591.6	$ 2,737.6	1,853.6	0.4
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	197.6		194.5	3.1	90.6		87.5	3.1
Dividends declared on common stock	(131.4)		(131.4)		(200.0)		(200.0)
Ending balance (in shares) at Jun. 30, 2022		229,515,301				1
Ending balance at Jun. 30, 2022	9,310.8	$ 7,212.5	2,136.0	3.5	4,482.2	$ 2,737.6	1,741.1	3.5
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	431.2		428.2	3.0	216.1		213.1	3.0
Dividends declared on common stock	(131.4)		(131.4)		(160.0)		(160.0)
Ending balance (in shares) at Sep. 30, 2022		229,532,136				1
Ending balance at Sep. 30, 2022	$ 9,615.5	$ 7,216.6	$ 2,432.2	$ 6.5	$ 4,538.3	$ 2,737.6	$ 1,794.2	$ 6.5