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SHAREHOLDERS' EQUITY - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions | 17 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2019 | Feb. 25, 2021 | Dec. 31, 2020 | Jul. 31, 2018
Line of Credit Facility [Line Items] |  |  |  |
Common stock, shares authorized (in shares) | 600,000,000 |  | 600,000,000 |
Preferred stock, shares authorized (in shares) |  |  | 12,000,000 |
Number of shares authorized to be repurchased (in shares) |  |  |  | 60,000,000
Stock repurchased and retired during period under repurchase plan, value | $ 2,671.0 |  |  |
Stock repurchased and retired during period (in shares) | 45,200,000 |  |  |
Restriction on payment of dividends (at least) |  |  | 35.00% |
Restricted net assets of subsidiaries |  |  | $ 5,700.0 |
Subsequent Event |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Stock to be Sold and Issued Under Securities Purchase Agreement, Shares |  | 2,269,447 |  |
Stock to be Sold and Issued Under Securities Purchase Agreement, Value |  | $ 113.2 |  |
Warrant to be Issued Under Securities Purchase Agreement for Potential Shares, Maximum |  | 3,950,000 |  |
Warrants and Rights Outstanding, Term |  | 3 years |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights |  | $ 64.70 |  |
Cash Borrowings |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Debt instrument, debt to capitalization ratio (no more than) |  |  | 65.00% |
Evergy Kansas Central |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Common stock, shares authorized (in shares) | 1,000 |  | 1,000 |
Restriction on payment of dividends (at least) |  |  | 40.00% |
Evergy Kansas Central | Cash Borrowings |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Debt instrument, debt to capitalization ratio (no more than) |  |  | 65.00% |
Evergy Metro |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Common stock, shares authorized (in shares) | 1,000 |  | 1,000 |
Restriction on payment of dividends (at least) |  |  | 40.00% |
Retained earnings restrictions |  |  | $ 385.6 |
Evergy Metro | Cash Borrowings |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Debt instrument, debt to capitalization ratio (no more than) |  |  | 65.00% |
Evergy Missouri West | Cash Borrowings |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Debt instrument, debt to capitalization ratio (no more than) |  |  | 65.00% |

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