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TAXES - Income Tax Expense (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Current Income Tax Expense (Benefit), Continuing Operations [Abstract] |  |  |
Current Federal Tax Expense (Benefit) | $ 25.3 | $ 31.9 | $ 15.6
Current State and Local Tax Expense (Benefit) | 6.9 | 8.3 | (0.4)
Current Income Tax Expense (Benefit), Total | 32.2 | 40.2 | 15.2
Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract] |  |  |
Deferred Federal Income Tax Expense (Benefit) | 10.2 | 17.2 | 92.8
Deferred State and Local Income Tax Expense (Benefit) | (21.7) | (3.4) | 14.7
Deferred Income Tax Expense (Benefit), Total | (11.5) | 13.8 | 107.5
Investment Tax Credits |  |  |
Deferral | 2.2 | 0.0 | 0.4
Investment tax credit amortization | (7.3) | (6.5) | (5.7)
Total | (5.1) | (6.5) | (5.3)
Income Tax Expense (Benefit), Total | $ 15.6 | $ 47.5 | $ 117.4
Effective Income Tax Rate Reconciliation, Percent [Abstract] |  |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent | 21.00% | 21.00% | 21.00%
Effect Of [Abstract] |  |  |
COLI policies | (1.90%) | (1.20%) | (1.00%)
State income taxes | (1.90%) | 0.30% | 1.00%
Flow through depreciation for plant-related differences | (8.00%) | (8.40%) | (5.40%)
Federal tax credits | (6.20%) | (4.00%) | (2.80%)
Non-controlling interest | (0.30%) | (0.30%) | (0.30%)
AFUDC equity | (0.30%) | (0.60%) | (0.60%)
Amortization of federal investment tax credits | (0.70%) | (0.60%) | (0.40%)
Valuation allowance | 0.40% | 0.00% | 0.00%
Stock compensation | 0.00% | (0.20%) | 0.00%
Officer compensation limitation | 0.30% | 0.30% | 0.50%
Other | (0.40%) | (0.50%) | (0.40%)
Effective Income Tax Rate Reconciliation, Percent, Total | 2.00% | 5.80% | 11.60%
Evergy Kansas Central |  |  |
Current Income Tax Expense (Benefit), Continuing Operations [Abstract] |  |  |
Current Federal Tax Expense (Benefit) | $ 27.8 | $ 95.8 | $ 53.3
Current State and Local Tax Expense (Benefit) | 4.7 | 3.9 | (0.2)
Current Income Tax Expense (Benefit), Total | 32.5 | 99.7 | 53.1
Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract] |  |  |
Deferred Federal Income Tax Expense (Benefit) | (29.3) | (78.7) | 3.8
Deferred State and Local Income Tax Expense (Benefit) | (7.4) | (4.6) | (1.2)
Deferred Income Tax Expense (Benefit), Total | (36.7) | (83.3) | 2.6
Investment Tax Credits |  |  |
Deferral | 2.2 | 0.0 | 0.3
Investment tax credit amortization | (3.9) | (4.1) | (4.3)
Total | (1.7) | (4.1) | (4.0)
Income Tax Expense (Benefit), Total | $ (5.9) | $ 12.3 | $ 51.7
Effective Income Tax Rate Reconciliation, Percent [Abstract] |  |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent | 21.00% | 21.00% | 21.00%
Effect Of [Abstract] |  |  |
COLI policies | (3.60%) | (2.20%) | (1.70%)
State income taxes | (1.00%) | (0.40%) | (0.40%)
Flow through depreciation for plant-related differences | (5.00%) | (6.60%) | (3.00%)
Federal tax credits | (11.70%) | (7.20%) | (5.00%)
Non-controlling interest | (0.70%) | (0.60%) | (0.50%)
AFUDC equity | (0.40%) | (0.40%) | (0.60%)
Amortization of federal investment tax credits | (0.60%) | (0.50%) | (0.50%)
Valuation allowance | 0.70% | 0.00% | 0.00%
Stock compensation | 0.00% | (0.20%) | (0.10%)
Officer compensation limitation | 0.00% | 0.10% | 0.30%
Other | (0.30%) | (0.20%) | (0.10%)
Effective Income Tax Rate Reconciliation, Percent, Total | (1.60%) | 2.80% | 9.40%
Evergy Metro |  |  |
Current Income Tax Expense (Benefit), Continuing Operations [Abstract] |  |  |
Current Federal Tax Expense (Benefit) | $ 13.2 | $ (21.9) | $ 39.2
Current State and Local Tax Expense (Benefit) | 3.7 | 4.1 | 3.2
Current Income Tax Expense (Benefit), Total | 16.9 | (17.8) | 42.4
Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract] |  |  |
Deferred Federal Income Tax Expense (Benefit) | 33.6 | 69.9 | 6.5
Deferred State and Local Income Tax Expense (Benefit) | (7.8) | 0.6 | 4.8
Deferred Income Tax Expense (Benefit), Total | 25.8 | 70.5 | 11.3
Investment Tax Credits |  |  |
Investment tax credit amortization | (3.5) | (2.4) | (1.3)
Income Tax Expense (Benefit), Total | $ 39.2 | $ 50.3 | $ 52.4
Effective Income Tax Rate Reconciliation, Percent [Abstract] |  |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent | 21.00% | 21.00% | 21.00%
Effect Of [Abstract] |  |  |
COLI policies | (0.10%) | (0.10%) | (0.20%)
State income taxes | (0.90%) | 0.90% | 1.70%
Flow through depreciation for plant-related differences | (7.60%) | (7.20%) | (7.80%)
Federal tax credits | (0.70%) | (0.10%) | (0.20%)
AFUDC equity | (0.30%) | (0.70%) | (0.70%)
Amortization of federal investment tax credits | (0.90%) | (0.60%) | (0.40%)
Stock compensation | 0.10% | (0.20%) | 0.00%
Officer compensation limitation | 0.50% | 0.50% | 0.90%
Other | (0.50%) | (1.10%) | 0.10%
Effective Income Tax Rate Reconciliation, Percent, Total | 10.60% | 12.40% | 14.40%

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