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, 2018		255,326,252				1
Beginning balance at Dec. 31, 2018	$ 9,990.7	$ 8,685.2	$ 1,346.0	$ (37.5)	$ 3,960.7	$ 2,737.6	$ 1,260.6	$ (37.5)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	103.4		99.5	3.9	68.3		64.4	3.9
Dividends declared on common stock	(119.8)		(119.8)		(110.0)		(110.0)
Consolidation of noncontrolling interests	5.4	5.4			3.8			3.8
Distributions to shareholders of noncontrolling interests	(0.3)	$ (0.3)			(1.4)			(1.4)
Ending balance (in shares) at Mar. 31, 2019		244,838,786				1
Ending balance at Mar. 31, 2019	9,391.7	$ 8,110.4	1,325.7	(31.2)	3,921.4	$ 2,737.6	1,215.0	(31.2)
Beginning balance (in shares) at Dec. 31, 2018		255,326,252				1
Beginning balance at Dec. 31, 2018	9,990.7	$ 8,685.2	1,346.0	(37.5)	3,960.7	$ 2,737.6	1,260.6	(37.5)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	248.0				135.5
Ending balance (in shares) at Jun. 30, 2019		235,465,848				1
Ending balance at Jun. 30, 2019	8,854.7	$ 7,563.0	1,349.1	(28.4)	3,986.5	$ 2,737.6	1,277.3	(28.4)
Beginning balance (in shares) at Mar. 31, 2019		244,838,786				1
Beginning balance at Mar. 31, 2019	9,391.7	$ 8,110.4	1,325.7	(31.2)	3,921.4	$ 2,737.6	1,215.0	(31.2)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	144.6		139.7	4.9	67.2		62.3	4.9
Dividends declared on common stock	(115.8)		(115.8)
Consolidation of noncontrolling interests	4.0	4.0
Distributions to shareholders of noncontrolling interests	(0.3)	$ (0.3)			(2.1)			(2.1)
Ending balance (in shares) at Jun. 30, 2019		235,465,848				1
Ending balance at Jun. 30, 2019	8,854.7	$ 7,563.0	1,349.1	(28.4)	3,986.5	$ 2,737.6	1,277.3	(28.4)
Beginning balance (in shares) at Dec. 31, 2019		226,641,443				1
Beginning balance at Dec. 31, 2019	8,545.3	$ 7,070.4	1,551.5	(26.6)	4,205.0	$ 2,737.6	1,494.0	(26.6)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	72.2		69.4	2.8	55.2		52.4	2.8
Dividends declared on common stock	(114.5)		(114.5)		(60.0)		(60.0)
Consolidation of noncontrolling interests	4.6	4.6
Distributions to shareholders of noncontrolling interests	0.2	$ 0.2
Ending balance (in shares) at Mar. 31, 2020		226,738,748				1
Ending balance at Mar. 31, 2020	8,505.4	$ 7,072.2	1,505.7	(23.8)	4,200.2	$ 2,737.6	1,486.4	(23.8)
Beginning balance (in shares) at Dec. 31, 2019		226,641,443				1
Beginning balance at Dec. 31, 2019	8,545.3	$ 7,070.4	1,551.5	(26.6)	4,205.0	$ 2,737.6	1,494.0	(26.6)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	208.5				17.6
Ending balance (in shares) at Jun. 30, 2020		226,825,105				1
Ending balance at Jun. 30, 2020	8,526.9	$ 7,073.5	1,524.1	(20.9)	4,102.6	$ 2,737.6	1,385.9	(20.9)
Beginning balance (in shares) at Mar. 31, 2020		226,738,748				1
Beginning balance at Mar. 31, 2020	8,505.4	$ 7,072.2	1,505.7	(23.8)	4,200.2	$ 2,737.6	1,486.4	(23.8)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	136.3		133.4	2.9	(37.6)		(40.5)	2.9
Dividends declared on common stock	(114.6)		(114.6)		(60.0)		(60.0)
Consolidation of noncontrolling interests	4.1	4.1
Distributions to shareholders of noncontrolling interests	0.1	$ 0.1
Ending balance (in shares) at Jun. 30, 2020		226,825,105				1
Ending balance at Jun. 30, 2020	$ 8,526.9	$ 7,073.5	$ 1,524.1	$ (20.9)	$ 4,102.6	$ 2,737.6	$ 1,385.9	$ (20.9)