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RELATED PARTY TRANSACTIONS AND RELATIONSHIPS (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Related Party Transaction [Line Items] |  |  |
Due to Related Party, Current | $ (616.9) | $ (600.8) |
Lease liability recorded in other current liabilities | 18.1 |  |
Evergy Metro |  |  |
Related Party Transaction [Line Items] |  |  |
Due to Related Party, Current | (272.5) | (252.3) |
Lease liability recorded in other current liabilities | 8.7 |  |
Evergy Metro | Evergy Missouri West |  |  |
Related Party Transaction [Line Items] |  |  |
Due from Related Party, Current | 91.9 | 137.5 |
Evergy Metro | Evergy Missouri West | Operating Expenses and Capital Costs Billed |  |  |
Related Party Transaction [Line Items] |  |  |
Related party transaction | 124.6 | 140.5 | $ 142.1
Evergy Metro | Evergy Kansas Central |  |  |
Related Party Transaction [Line Items] |  |  |
Due from Related Party, Current | 19.6 | 15.7 |
Evergy Metro | Evergy Kansas Central | Operating Expenses and Capital Costs Billed |  |  |
Related Party Transaction [Line Items] |  |  |
Related party transaction | 132.9 | 238.4 | 134.7
Evergy Metro | Evergy |  |  |
Related Party Transaction [Line Items] |  |  |
Due from Related Party, Current | 15.9 | 16.3 |
Evergy Metro | Evergy | Income Tax Receivable |  |  |
Related Party Transaction [Line Items] |  |  |
Due to Related Party, Current | (6.8) |  |
Evergy Metro | Evergy | Income Taxes Payable |  |  |
Related Party Transaction [Line Items] |  |  |
Due from Related Party, Current |  | 0.2 |
Evergy Metro | Related Party [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Due from Related Party, Current | 128.5 | 170.4 |
Due to Related Party, Current | (1.1) | (0.9) |
Evergy Metro | Related Party [Member] | Evergy Inc Money Pool |  |  |
Related Party Transaction [Line Items] |  |  |
Due from Related Party, Current | 0.0 | 31.0 |
Due to Related Party, Current | 0.0 |  |
Evergy Kansas Central |  |  |
Related Party Transaction [Line Items] |  |  |
Due to Related Party, Current | (244.7) | (247.3) |
Lease liability recorded in other current liabilities | 8.9 |  |
Evergy Kansas Central | Evergy Missouri West |  |  |
Related Party Transaction [Line Items] |  |  |
Due from Related Party, Current | 11.3 | 7.4 |
Evergy Kansas Central | Evergy Missouri West | Operating Expenses and Capital Costs Billed |  |  |
Related Party Transaction [Line Items] |  |  |
Related party transaction | 33.0 | 32.7 | 32.5
Evergy Kansas Central | Evergy Metro |  |  |
Related Party Transaction [Line Items] |  |  |
Due to Related Party, Current | (19.6) | (15.7) |
Evergy Kansas Central | Evergy Metro | Operating Expenses and Capital Costs Billed |  |  |
Related Party Transaction [Line Items] |  |  |
Related party transaction | 48.4 | 33.1 | $ 29.4
Evergy Kansas Central | Evergy |  |  |
Related Party Transaction [Line Items] |  |  |
Due to Related Party, Current | (274.5) | (12.7) |
Evergy Kansas Central | Evergy | Income Tax Receivable |  |  |
Related Party Transaction [Line Items] |  |  |
Due to Related Party, Current |  | (10.3) |
Evergy Kansas Central | Evergy | Income Taxes Payable |  |  |
Related Party Transaction [Line Items] |  |  |
Due from Related Party, Current | 11.5 |  |
Evergy Kansas Central | Related Party [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Due from Related Party, Current | 11.6 | 7.9 |
Due to Related Party, Current | (294.4) | (28.9) |
Evergy Kansas Central | Related Party [Member] | Evergy Inc Money Pool |  |  |
Related Party Transaction [Line Items] |  |  |
Due from Related Party, Current |  | 0.0 |
Due to Related Party, Current | $ (261.4) | $ 0.0 |
Jointly Owned Electricity Generation Plant Iatan No 1 And 2 | Evergy Missouri West |  |  |
Related Party Transaction [Line Items] |  |  |
Jointly owned utility plant, proportionate ownership share | 18.00% |  |
Jeffrey Energy Center | Evergy Missouri West |  |  |
Related Party Transaction [Line Items] |  |  |
Jointly owned utility plant, proportionate ownership share | 8.00% |  |
La Cygne Station | Evergy Kansas Central |  |  |
Related Party Transaction [Line Items] |  |  |
Jointly owned utility plant, proportionate ownership share | 50.00% |  |

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