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FAIR VALUE MEASUREMENTS - Recurring (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Assets
Derivative Asset, Statement of Financial Position [Extensible Enumeration]	Other assets, Other	Other assets, Other
Derivative Liability, Statement of Financial Position [Extensible Enumeration]	Other, Other	Other, Other
Fair Value, Measurements, Recurring
Assets
Total nuclear decommissioning trust	$ 766.4	$ 653.3
Total rabbi trust	33.3	34.1
Derivative Asset	42.7	50.3
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset	(90.3)	(279.5)
Total self-insured health plan trust	15.7	11.2
Total Assets	858.1	748.9
Derivative Liability	45.4	52.5
FIN 39 Derivative liability netting	(83.4)	(270.4)
Total Liabilities	45.4	52.5
Fair Value, Measurements, Recurring | Level 1
Assets
Total nuclear decommissioning trust	653.7	547.1
Total rabbi trust	33.3	34.1
Derivative Asset, Fair Value, Gross Asset	89.0	268.0
Total self-insured health plan trust	8.8	5.7
Total Assets	784.8	854.9
Derivative Liability, Fair Value, Gross Liability	82.0	250.8
Total Liabilities	82.0	250.8
Fair Value, Measurements, Recurring | Level 2
Assets
Total nuclear decommissioning trust	47.8	43.4
Total rabbi trust	0.0	0.0
Derivative Asset, Fair Value, Gross Asset	33.6	46.6
Total self-insured health plan trust	6.9	5.5
Total Assets	88.3	95.5
Derivative Liability, Fair Value, Gross Liability	36.9	59.7
Total Liabilities	36.9	59.7
Fair Value, Measurements, Recurring | Level 3
Assets
Total nuclear decommissioning trust	0.0	0.0
Total rabbi trust	0.0	0.0
Derivative Asset, Fair Value, Gross Asset	10.4	15.2
Total self-insured health plan trust	0.0	0.0
Total Assets	10.4	15.2
Derivative Liability, Fair Value, Gross Liability	9.9	12.4
Total Liabilities	9.9	12.4
Fair Value, Measurements, Recurring | NAV
Assets
Total nuclear decommissioning trust	64.9	62.8
Total rabbi trust	0.0	0.0
Derivative Asset, Fair Value, Gross Asset	0.0	0.0
Total self-insured health plan trust	0.0	0.0
Total Assets	64.9	62.8
Derivative Liability, Fair Value, Gross Liability	0.0	0.0
Total Liabilities	0.0	0.0
Fair Value, Measurements, Recurring | Power commodity contract
Assets
Derivative Asset	42.0	43.0
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset	(16.9)	(64.2)
Derivative Liability	43.9	47.4
FIN 39 Derivative liability netting	(10.0)	(55.1)
Fair Value, Measurements, Recurring | Power commodity contract | Level 1
Assets
Derivative Asset, Fair Value, Gross Asset	16.3	45.5
Derivative Liability, Fair Value, Gross Liability	9.4	34.2
Fair Value, Measurements, Recurring | Power commodity contract | Level 2
Assets
Derivative Asset, Fair Value, Gross Asset	32.2	46.5
Derivative Liability, Fair Value, Gross Liability	34.6	55.9
Fair Value, Measurements, Recurring | Power commodity contract | Level 3
Assets
Derivative Asset, Fair Value, Gross Asset	10.4	15.2
Derivative Liability, Fair Value, Gross Liability	9.9	12.4
Fair Value, Measurements, Recurring | Power commodity contract | NAV
Assets
Derivative Asset, Fair Value, Gross Asset	0.0	0.0
Derivative Liability, Fair Value, Gross Liability	0.0	0.0
Fair Value, Measurements, Recurring | Natural gas commodity contract
Assets
Derivative Asset	0.7	7.3
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset	(73.4)	(215.3)
Derivative Liability	1.5	5.1
FIN 39 Derivative liability netting	(73.4)	(215.3)
Fair Value, Measurements, Recurring | Natural gas commodity contract | Level 1
Assets
Derivative Asset, Fair Value, Gross Asset	72.7	222.5
Derivative Liability, Fair Value, Gross Liability	72.6	216.6
Fair Value, Measurements, Recurring | Natural gas commodity contract | Level 2
Assets
Derivative Asset, Fair Value, Gross Asset	1.4	0.1
Derivative Liability, Fair Value, Gross Liability	2.3	3.8
Fair Value, Measurements, Recurring | Natural gas commodity contract | Level 3
Assets
Derivative Asset, Fair Value, Gross Asset	0.0	0.0
Derivative Liability, Fair Value, Gross Liability	0.0	0.0
Fair Value, Measurements, Recurring | Natural gas commodity contract | NAV
Assets
Derivative Asset, Fair Value, Gross Asset	0.0	0.0
Derivative Liability, Fair Value, Gross Liability	$ 0.0	$ 0.0
Evergy Kansas Central
Assets
Derivative Asset, Statement of Financial Position [Extensible Enumeration]	Other assets, Other	Other assets, Other
Derivative Liability, Statement of Financial Position [Extensible Enumeration]	Other, Other	Other, Other
Evergy Kansas Central | Fair Value, Measurements, Recurring
Assets
Total nuclear decommissioning trust	$ 365.1	$ 318.8
Total rabbi trust	24.5	24.9
Derivative Asset	40.9	49.9
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset	(87.2)	(275.0)
Total Assets	430.5	393.6
Derivative Liability	40.7	48.0
FIN 39 Derivative liability netting	(80.3)	(265.8)
Total Liabilities	40.7	48.0
Evergy Kansas Central | Fair Value, Measurements, Recurring | Core bond fund
Assets
Total nuclear decommissioning trust	56.2	51.0
Evergy Kansas Central | Fair Value, Measurements, Recurring | High-yield bond fund
Assets
Total nuclear decommissioning trust	29.1	25.3
Evergy Kansas Central | Fair Value, Measurements, Recurring | Emerging markets bond fund
Assets
Total nuclear decommissioning trust	18.3	16.0
Evergy Kansas Central | Fair Value, Measurements, Recurring | Combination debt/equity/other fund
Assets
Total rabbi trust	1.7	1.9
Evergy Kansas Central | Fair Value, Measurements, Recurring | Alternative investments fund
Assets
Total nuclear decommissioning trust	37.9	31.8
Evergy Kansas Central | Fair Value, Measurements, Recurring | Real estate securities fund
Assets
Total nuclear decommissioning trust	17.2	18.9
Evergy Kansas Central | Fair Value, Measurements, Recurring | Cash equivalents
Assets
Total nuclear decommissioning trust	0.7	0.4
Total rabbi trust	0.2	0.1
Evergy Kansas Central | Fair Value, Measurements, Recurring | Equity funds
Assets
Total rabbi trust	7.4	7.3
Evergy Kansas Central | Fair Value, Measurements, Recurring | Fixed income funds
Assets
Total rabbi trust	15.2	15.6
Evergy Kansas Central | Fair Value, Measurements, Recurring | Level 1
Assets
Total nuclear decommissioning trust	300.2	256.0
Total rabbi trust	24.5	24.9
Derivative Asset, Fair Value, Gross Asset	89.0	268.0
Total Assets	413.7	548.9
Derivative Liability, Fair Value, Gross Liability	82.0	250.6
Total Liabilities	82.0	250.6
Evergy Kansas Central | Fair Value, Measurements, Recurring | Level 1 | Core bond fund
Assets
Total nuclear decommissioning trust	56.2	51.0
Evergy Kansas Central | Fair Value, Measurements, Recurring | Level 1 | High-yield bond fund
Assets
Total nuclear decommissioning trust	29.1	25.3
Evergy Kansas Central | Fair Value, Measurements, Recurring | Level 1 | Emerging markets bond fund
Assets
Total nuclear decommissioning trust	18.3	16.0
Evergy Kansas Central | Fair Value, Measurements, Recurring | Level 1 | Combination debt/equity/other fund
Assets
Total rabbi trust	1.7	1.9
Evergy Kansas Central | Fair Value, Measurements, Recurring | Level 1 | Alternative investments fund
Assets
Total nuclear decommissioning trust	0.0	0.0
Evergy Kansas Central | Fair Value, Measurements, Recurring | Level 1 | Real estate securities fund
Assets
Total nuclear decommissioning trust	0.0	0.0
Evergy Kansas Central | Fair Value, Measurements, Recurring | Level 1 | Cash equivalents
Assets
Total nuclear decommissioning trust	0.7	0.4
Total rabbi trust	0.2	0.1
Evergy Kansas Central | Fair Value, Measurements, Recurring | Level 1 | Equity funds
Assets
Total rabbi trust	7.4	7.3
Evergy Kansas Central | Fair Value, Measurements, Recurring | Level 1 | Fixed income funds
Assets
Total rabbi trust	15.2	15.6
Evergy Kansas Central | Fair Value, Measurements, Recurring | Level 2
Assets
Total nuclear decommissioning trust	0.0	0.0
Total rabbi trust	0.0	0.0
Derivative Asset, Fair Value, Gross Asset	33.6	46.6
Total Assets	33.6	46.6
Derivative Liability, Fair Value, Gross Liability	35.8	56.0
Total Liabilities	35.8	56.0
Evergy Kansas Central | Fair Value, Measurements, Recurring | Level 2 | Core bond fund
Assets
Total nuclear decommissioning trust	0.0	0.0
Evergy Kansas Central | Fair Value, Measurements, Recurring | Level 2 | High-yield bond fund
Assets
Total nuclear decommissioning trust	0.0	0.0
Evergy Kansas Central | Fair Value, Measurements, Recurring | Level 2 | Emerging markets bond fund
Assets
Total nuclear decommissioning trust	0.0	0.0
Evergy Kansas Central | Fair Value, Measurements, Recurring | Level 2 | Combination debt/equity/other fund
Assets
Total rabbi trust	0.0	0.0
Evergy Kansas Central | Fair Value, Measurements, Recurring | Level 2 | Alternative investments fund
Assets
Total nuclear decommissioning trust	0.0	0.0
Evergy Kansas Central | Fair Value, Measurements, Recurring | Level 2 | Real estate securities fund
Assets
Total nuclear decommissioning trust	0.0	0.0
Evergy Kansas Central | Fair Value, Measurements, Recurring | Level 2 | Cash equivalents
Assets
Total nuclear decommissioning trust	0.0	0.0
Total rabbi trust	0.0	0.0
Evergy Kansas Central | Fair Value, Measurements, Recurring | Level 2 | Equity funds
Assets
Total rabbi trust	0.0	0.0
Evergy Kansas Central | Fair Value, Measurements, Recurring | Level 2 | Fixed income funds
Assets
Total rabbi trust	0.0	0.0
Evergy Kansas Central | Fair Value, Measurements, Recurring | Level 3
Assets
Total nuclear decommissioning trust	0.0	0.0
Total rabbi trust	0.0	0.0
Derivative Asset, Fair Value, Gross Asset	5.5	10.3
Total Assets	5.5	10.3
Derivative Liability, Fair Value, Gross Liability	3.2	7.2
Total Liabilities	3.2	7.2
Evergy Kansas Central | Fair Value, Measurements, Recurring | Level 3 | Core bond fund
Assets
Total nuclear decommissioning trust	0.0	0.0
Evergy Kansas Central | Fair Value, Measurements, Recurring | Level 3 | High-yield bond fund
Assets
Total nuclear decommissioning trust	0.0	0.0
Evergy Kansas Central | Fair Value, Measurements, Recurring | Level 3 | Emerging markets bond fund
Assets
Total nuclear decommissioning trust	0.0	0.0
Evergy Kansas Central | Fair Value, Measurements, Recurring | Level 3 | Combination debt/equity/other fund
Assets
Total rabbi trust	0.0	0.0
Evergy Kansas Central | Fair Value, Measurements, Recurring | Level 3 | Alternative investments fund
Assets
Total nuclear decommissioning trust	0.0	0.0
Evergy Kansas Central | Fair Value, Measurements, Recurring | Level 3 | Real estate securities fund
Assets
Total nuclear decommissioning trust	0.0	0.0
Evergy Kansas Central | Fair Value, Measurements, Recurring | Level 3 | Cash equivalents
Assets
Total nuclear decommissioning trust	0.0	0.0
Total rabbi trust	0.0	0.0
Evergy Kansas Central | Fair Value, Measurements, Recurring | Level 3 | Equity funds
Assets
Total rabbi trust	0.0	0.0
Evergy Kansas Central | Fair Value, Measurements, Recurring | Level 3 | Fixed income funds
Assets
Total rabbi trust	0.0	0.0
Evergy Kansas Central | Fair Value, Measurements, Recurring | NAV
Assets
Total nuclear decommissioning trust	64.9	62.8
Total rabbi trust	0.0	0.0
Derivative Asset, Fair Value, Gross Asset	0.0	0.0
Total Assets	64.9	62.8
Derivative Liability, Fair Value, Gross Liability	0.0	0.0
Total Liabilities	0.0	0.0
Evergy Kansas Central | Fair Value, Measurements, Recurring | NAV | Core bond fund
Assets
Total nuclear decommissioning trust	0.0	0.0
Evergy Kansas Central | Fair Value, Measurements, Recurring | NAV | High-yield bond fund
Assets
Total nuclear decommissioning trust	0.0	0.0
Evergy Kansas Central | Fair Value, Measurements, Recurring | NAV | Emerging markets bond fund
Assets
Total nuclear decommissioning trust	0.0	0.0
Evergy Kansas Central | Fair Value, Measurements, Recurring | NAV | Combination debt/equity/other fund
Assets
Total rabbi trust	0.0	0.0
Evergy Kansas Central | Fair Value, Measurements, Recurring | NAV | Alternative investments fund
Assets
Total nuclear decommissioning trust	37.9	31.8
Evergy Kansas Central | Fair Value, Measurements, Recurring | NAV | Real estate securities fund
Assets
Total nuclear decommissioning trust	17.2	18.9
Evergy Kansas Central | Fair Value, Measurements, Recurring | NAV | Cash equivalents
Assets
Total nuclear decommissioning trust	0.0	0.0
Total rabbi trust	0.0	0.0
Evergy Kansas Central | Fair Value, Measurements, Recurring | NAV | Equity funds
Assets
Total rabbi trust	0.0	0.0
Evergy Kansas Central | Fair Value, Measurements, Recurring | NAV | Fixed income funds
Assets
Total rabbi trust	0.0	0.0
Evergy Kansas Central | Fair Value, Measurements, Recurring | Power commodity contract
Assets
Derivative Asset	40.2	42.6
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset	(13.8)	(59.7)
Derivative Liability	40.3	46.6
FIN 39 Derivative liability netting	(6.9)	(50.5)
Evergy Kansas Central | Fair Value, Measurements, Recurring | Power commodity contract | Level 1
Assets
Derivative Asset, Fair Value, Gross Asset	16.3	45.5
Derivative Liability, Fair Value, Gross Liability	9.4	34.0
Evergy Kansas Central | Fair Value, Measurements, Recurring | Power commodity contract | Level 2
Assets
Derivative Asset, Fair Value, Gross Asset	32.2	46.5
Derivative Liability, Fair Value, Gross Liability	34.6	55.9
Evergy Kansas Central | Fair Value, Measurements, Recurring | Power commodity contract | Level 3
Assets
Derivative Asset, Fair Value, Gross Asset	5.5	10.3
Derivative Liability, Fair Value, Gross Liability	3.2	7.2
Evergy Kansas Central | Fair Value, Measurements, Recurring | Power commodity contract | NAV
Assets
Derivative Asset, Fair Value, Gross Asset	0.0	0.0
Derivative Liability, Fair Value, Gross Liability	0.0	0.0
Evergy Kansas Central | Fair Value, Measurements, Recurring | Natural gas commodity contract
Assets
Derivative Asset	0.7	7.3
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset	(73.4)	(215.3)
Derivative Liability	0.4	1.4
FIN 39 Derivative liability netting	(73.4)	(215.3)
Evergy Kansas Central | Fair Value, Measurements, Recurring | Natural gas commodity contract | Level 1
Assets
Derivative Asset, Fair Value, Gross Asset	72.7	222.5
Derivative Liability, Fair Value, Gross Liability	72.6	216.6
Evergy Kansas Central | Fair Value, Measurements, Recurring | Natural gas commodity contract | Level 2
Assets
Derivative Asset, Fair Value, Gross Asset	1.4	0.1
Derivative Liability, Fair Value, Gross Liability	1.2	0.1
Evergy Kansas Central | Fair Value, Measurements, Recurring | Natural gas commodity contract | Level 3
Assets
Derivative Asset, Fair Value, Gross Asset	0.0	0.0
Derivative Liability, Fair Value, Gross Liability	0.0	0.0
Evergy Kansas Central | Fair Value, Measurements, Recurring | Natural gas commodity contract | NAV
Assets
Derivative Asset, Fair Value, Gross Asset	0.0	0.0
Derivative Liability, Fair Value, Gross Liability	0.0	0.0
Evergy Kansas Central | Domestic | Fair Value, Measurements, Recurring | Equity securities
Assets
Total nuclear decommissioning trust	133.1	112.5
Evergy Kansas Central | Domestic | Fair Value, Measurements, Recurring | Level 1 | Equity securities
Assets
Total nuclear decommissioning trust	123.3	100.4
Evergy Kansas Central | Domestic | Fair Value, Measurements, Recurring | Level 2 | Equity securities
Assets
Total nuclear decommissioning trust	0.0	0.0
Evergy Kansas Central | Domestic | Fair Value, Measurements, Recurring | Level 3 | Equity securities
Assets
Total nuclear decommissioning trust	0.0	0.0
Evergy Kansas Central | Domestic | Fair Value, Measurements, Recurring | NAV | Equity securities
Assets
Total nuclear decommissioning trust	9.8	12.1
Evergy Kansas Central | International | Fair Value, Measurements, Recurring | Equity securities
Assets
Total nuclear decommissioning trust	72.6	62.9
Evergy Kansas Central | International | Fair Value, Measurements, Recurring | Level 1 | Equity securities
Assets
Total nuclear decommissioning trust	72.6	62.9
Evergy Kansas Central | International | Fair Value, Measurements, Recurring | Level 2 | Equity securities
Assets
Total nuclear decommissioning trust	0.0	0.0
Evergy Kansas Central | International | Fair Value, Measurements, Recurring | Level 3 | Equity securities
Assets
Total nuclear decommissioning trust	0.0	0.0
Evergy Kansas Central | International | Fair Value, Measurements, Recurring | NAV | Equity securities
Assets
Total nuclear decommissioning trust	$ 0.0	$ 0.0
Evergy Metro
Assets
Derivative Asset, Statement of Financial Position [Extensible Enumeration]	Other assets, Other	Other assets, Other
Derivative Liability, Statement of Financial Position [Extensible Enumeration]	Other, Other	Other, Other
Evergy Metro | Fair Value, Measurements, Recurring
Assets
Total nuclear decommissioning trust	$ 401.3	$ 334.5
Derivative Asset	0.0	0.0
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset	(2.1)	(3.5)
Total self-insured health plan trust	15.7	11.2
Total Assets	417.0	345.7
Derivative Liability	3.6	0.6
FIN 39 Derivative liability netting	(2.1)	(3.5)
Total Liabilities	3.6	0.6
Evergy Metro | Fair Value, Measurements, Recurring | Equity securities
Assets
Total nuclear decommissioning trust	302.4	243.4
Total self-insured health plan trust	2.0	1.6
Evergy Metro | Fair Value, Measurements, Recurring | Cash equivalents
Assets
Total nuclear decommissioning trust	3.2	6.6
Evergy Metro | Fair Value, Measurements, Recurring | U.S. Treasury
Assets
Total nuclear decommissioning trust	47.9	40.7
Evergy Metro | Fair Value, Measurements, Recurring | U.S. Agency
Assets
Total nuclear decommissioning trust		0.4
Evergy Metro | Fair Value, Measurements, Recurring | State and local obligations
Assets
Total nuclear decommissioning trust	3.8	4.2
Evergy Metro | Fair Value, Measurements, Recurring | Corporate bonds
Assets
Total nuclear decommissioning trust	43.9	39.1
Evergy Metro | Fair Value, Measurements, Recurring | Foreign governments
Assets
Total nuclear decommissioning trust	0.1	0.1
Evergy Metro | Fair Value, Measurements, Recurring | Debt securities
Assets
Total self-insured health plan trust	9.4	8.0
Evergy Metro | Fair Value, Measurements, Recurring | Cash and cash equivalents
Assets
Total self-insured health plan trust	4.3	1.6
Evergy Metro | Fair Value, Measurements, Recurring | Level 1
Assets
Total nuclear decommissioning trust	353.5	291.1
Derivative Asset, Fair Value, Gross Asset	0.0	0.0
Total self-insured health plan trust	8.8	5.7
Total Assets	362.3	296.8
Derivative Liability, Fair Value, Gross Liability	0.0	0.0
Total Liabilities	0.0	0.0
Evergy Metro | Fair Value, Measurements, Recurring | Level 1 | Equity securities
Assets
Total nuclear decommissioning trust	302.4	243.4
Total self-insured health plan trust	2.0	1.6
Evergy Metro | Fair Value, Measurements, Recurring | Level 1 | Cash equivalents
Assets
Total nuclear decommissioning trust	3.2	6.6
Evergy Metro | Fair Value, Measurements, Recurring | Level 1 | U.S. Treasury
Assets
Total nuclear decommissioning trust	47.9	40.7
Evergy Metro | Fair Value, Measurements, Recurring | Level 1 | U.S. Agency
Assets
Total nuclear decommissioning trust		0.4
Evergy Metro | Fair Value, Measurements, Recurring | Level 1 | State and local obligations
Assets
Total nuclear decommissioning trust	0.0	0.0
Evergy Metro | Fair Value, Measurements, Recurring | Level 1 | Corporate bonds
Assets
Total nuclear decommissioning trust	0.0	0.0
Evergy Metro | Fair Value, Measurements, Recurring | Level 1 | Foreign governments
Assets
Total nuclear decommissioning trust	0.0	0.0
Evergy Metro | Fair Value, Measurements, Recurring | Level 1 | Debt securities
Assets
Total self-insured health plan trust	2.5	2.5
Evergy Metro | Fair Value, Measurements, Recurring | Level 1 | Cash and cash equivalents
Assets
Total self-insured health plan trust	4.3	1.6
Evergy Metro | Fair Value, Measurements, Recurring | Level 2
Assets
Total nuclear decommissioning trust	47.8	43.4
Derivative Asset, Fair Value, Gross Asset	0.0	0.0
Total self-insured health plan trust	6.9	5.5
Total Assets	54.7	48.9
Derivative Liability, Fair Value, Gross Liability	0.0	0.0
Total Liabilities	0.0	0.0
Evergy Metro | Fair Value, Measurements, Recurring | Level 2 | Equity securities
Assets
Total nuclear decommissioning trust	0.0	0.0
Total self-insured health plan trust	0.0	0.0
Evergy Metro | Fair Value, Measurements, Recurring | Level 2 | Cash equivalents
Assets
Total nuclear decommissioning trust	0.0	0.0
Evergy Metro | Fair Value, Measurements, Recurring | Level 2 | U.S. Treasury
Assets
Total nuclear decommissioning trust	0.0	0.0
Evergy Metro | Fair Value, Measurements, Recurring | Level 2 | U.S. Agency
Assets
Total nuclear decommissioning trust		0.0
Evergy Metro | Fair Value, Measurements, Recurring | Level 2 | State and local obligations
Assets
Total nuclear decommissioning trust	3.8	4.2
Evergy Metro | Fair Value, Measurements, Recurring | Level 2 | Corporate bonds
Assets
Total nuclear decommissioning trust	43.9	39.1
Evergy Metro | Fair Value, Measurements, Recurring | Level 2 | Foreign governments
Assets
Total nuclear decommissioning trust	0.1	0.1
Evergy Metro | Fair Value, Measurements, Recurring | Level 2 | Debt securities
Assets
Total self-insured health plan trust	6.9	5.5
Evergy Metro | Fair Value, Measurements, Recurring | Level 2 | Cash and cash equivalents
Assets
Total self-insured health plan trust	0.0	0.0
Evergy Metro | Fair Value, Measurements, Recurring | Level 3
Assets
Total nuclear decommissioning trust	0.0	0.0
Derivative Asset, Fair Value, Gross Asset	2.1	3.5
Total self-insured health plan trust	0.0	0.0
Total Assets	2.1	3.5
Derivative Liability, Fair Value, Gross Liability	5.7	4.1
Total Liabilities	5.7	4.1
Evergy Metro | Fair Value, Measurements, Recurring | Level 3 | Equity securities
Assets
Total nuclear decommissioning trust	0.0	0.0
Total self-insured health plan trust	0.0	0.0
Evergy Metro | Fair Value, Measurements, Recurring | Level 3 | Cash equivalents
Assets
Total nuclear decommissioning trust	0.0	0.0
Evergy Metro | Fair Value, Measurements, Recurring | Level 3 | U.S. Treasury
Assets
Total nuclear decommissioning trust	0.0	0.0
Evergy Metro | Fair Value, Measurements, Recurring | Level 3 | U.S. Agency
Assets
Total nuclear decommissioning trust		0.0
Evergy Metro | Fair Value, Measurements, Recurring | Level 3 | State and local obligations
Assets
Total nuclear decommissioning trust	0.0	0.0
Evergy Metro | Fair Value, Measurements, Recurring | Level 3 | Corporate bonds
Assets
Total nuclear decommissioning trust	0.0	0.0
Evergy Metro | Fair Value, Measurements, Recurring | Level 3 | Foreign governments
Assets
Total nuclear decommissioning trust	0.0	0.0
Evergy Metro | Fair Value, Measurements, Recurring | Level 3 | Debt securities
Assets
Total self-insured health plan trust	0.0	0.0
Evergy Metro | Fair Value, Measurements, Recurring | Level 3 | Cash and cash equivalents
Assets
Total self-insured health plan trust	0.0	0.0
Evergy Metro | Fair Value, Measurements, Recurring | NAV
Assets
Total nuclear decommissioning trust	0.0	0.0
Derivative Asset, Fair Value, Gross Asset	0.0	0.0
Total self-insured health plan trust	0.0	0.0
Total Assets	0.0	0.0
Derivative Liability, Fair Value, Gross Liability	0.0	0.0
Total Liabilities	0.0	0.0
Evergy Metro | Fair Value, Measurements, Recurring | NAV | Equity securities
Assets
Total nuclear decommissioning trust	0.0	0.0
Total self-insured health plan trust	0.0	0.0
Evergy Metro | Fair Value, Measurements, Recurring | NAV | Cash equivalents
Assets
Total nuclear decommissioning trust	0.0	0.0
Evergy Metro | Fair Value, Measurements, Recurring | NAV | U.S. Treasury
Assets
Total nuclear decommissioning trust	0.0	0.0
Evergy Metro | Fair Value, Measurements, Recurring | NAV | U.S. Agency
Assets
Total nuclear decommissioning trust		0.0
Evergy Metro | Fair Value, Measurements, Recurring | NAV | State and local obligations
Assets
Total nuclear decommissioning trust	0.0	0.0
Evergy Metro | Fair Value, Measurements, Recurring | NAV | Corporate bonds
Assets
Total nuclear decommissioning trust	0.0	0.0
Evergy Metro | Fair Value, Measurements, Recurring | NAV | Foreign governments
Assets
Total nuclear decommissioning trust	0.0	0.0
Evergy Metro | Fair Value, Measurements, Recurring | NAV | Debt securities
Assets
Total self-insured health plan trust	0.0	0.0
Evergy Metro | Fair Value, Measurements, Recurring | NAV | Cash and cash equivalents
Assets
Total self-insured health plan trust	0.0	0.0
Evergy Metro | Fair Value, Measurements, Recurring | Power commodity contract
Assets
Derivative Asset	0.0	0.0
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset	(2.1)	(3.5)
Derivative Liability	3.6	0.6
FIN 39 Derivative liability netting	(2.1)	(3.5)
Evergy Metro | Fair Value, Measurements, Recurring | Power commodity contract | Level 1
Assets
Derivative Asset, Fair Value, Gross Asset	0.0	0.0
Derivative Liability, Fair Value, Gross Liability	0.0	0.0
Evergy Metro | Fair Value, Measurements, Recurring | Power commodity contract | Level 2
Assets
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Derivative Liability, Fair Value, Gross Liability	0.0	0.0
Evergy Metro | Fair Value, Measurements, Recurring | Power commodity contract | Level 3
Assets
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Derivative Liability, Fair Value, Gross Liability	5.7	4.1
Evergy Metro | Fair Value, Measurements, Recurring | Power commodity contract | NAV
Assets
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Derivative Liability, Fair Value, Gross Liability	$ 0.0	$ 0.0
Other Evergy
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Derivative Liability, Statement of Financial Position [Extensible Enumeration]	Other, Other	Other, Other
Other Evergy | Fair Value, Measurements, Recurring
Assets
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Derivative Asset	1.8	0.4
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset	(1.0)	(1.0)
Total Assets	10.6	9.6
Derivative Liability	1.1	3.9
FIN 39 Derivative liability netting	(1.0)	(1.1)
Total Liabilities	1.1	3.9
Other Evergy | Fair Value, Measurements, Recurring | Core bond fund
Assets
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Other Evergy | Fair Value, Measurements, Recurring | Level 1
Assets
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Derivative Asset, Fair Value, Gross Asset	0.0	0.0
Total Assets	8.8	9.2
Derivative Liability, Fair Value, Gross Liability	0.0	0.2
Total Liabilities	0.0	0.2
Other Evergy | Fair Value, Measurements, Recurring | Level 1 | Core bond fund
Assets
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Other Evergy | Fair Value, Measurements, Recurring | Level 2
Assets
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Derivative Asset, Fair Value, Gross Asset	0.0	0.0
Total Assets	0.0	0.0
Derivative Liability, Fair Value, Gross Liability	1.1	3.7
Total Liabilities	1.1	3.7
Other Evergy | Fair Value, Measurements, Recurring | Level 2 | Core bond fund
Assets
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Other Evergy | Fair Value, Measurements, Recurring | Level 3
Assets
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Derivative Asset, Fair Value, Gross Asset	2.8	1.4
Total Assets	2.8	1.4
Derivative Liability, Fair Value, Gross Liability	1.0	1.1
Total Liabilities	1.0	1.1
Other Evergy | Fair Value, Measurements, Recurring | Level 3 | Core bond fund
Assets
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Other Evergy | Fair Value, Measurements, Recurring | NAV
Assets
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Derivative Asset, Fair Value, Gross Asset	0.0	0.0
Total Assets	0.0	0.0
Derivative Liability, Fair Value, Gross Liability	0.0	0.0
Total Liabilities	0.0	0.0
Other Evergy | Fair Value, Measurements, Recurring | NAV | Core bond fund
Assets
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Other Evergy | Fair Value, Measurements, Recurring | Power commodity contract
Assets
Derivative Asset	1.8	0.4
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset	(1.0)	(1.0)
Derivative Liability	0.0	0.2
FIN 39 Derivative liability netting	(1.0)	(1.1)
Other Evergy | Fair Value, Measurements, Recurring | Power commodity contract | Level 1
Assets
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Derivative Liability, Fair Value, Gross Liability	0.0	0.2
Other Evergy | Fair Value, Measurements, Recurring | Power commodity contract | Level 2
Assets
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Derivative Liability, Fair Value, Gross Liability	0.0	0.0
Other Evergy | Fair Value, Measurements, Recurring | Power commodity contract | Level 3
Assets
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Derivative Liability, Fair Value, Gross Liability	1.0	1.1
Other Evergy | Fair Value, Measurements, Recurring | Power commodity contract | NAV
Assets
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Derivative Liability, Fair Value, Gross Liability	0.0	0.0
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FIN 39 Derivative liability netting	0.0	0.0
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Other Evergy | Fair Value, Measurements, Recurring | Natural gas commodity contract | Level 3
Assets
Derivative Liability, Fair Value, Gross Liability	0.0	0.0
Other Evergy | Fair Value, Measurements, Recurring | Natural gas commodity contract | NAV
Assets
Derivative Liability, Fair Value, Gross Liability	$ 0.0	$ 0.0

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