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Derivative Instruments (Tables) | 12 Months Ended
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Dec. 31, 2023
Derivative Instruments and Hedging Activities Disclosure [Abstract] |
Schedule of Notional Amounts of Outstanding Derivative Positions [Table Text Block] | The gross notional contract amount by commodity type for derivative instruments is summarized in the following table.
|  | December 31
Non-hedging derivatives | Notional volume unit of measure | 2023 |  | 2022
Evergy |  | (millions)
Commodity contracts |  |  |  |
Power | MWhs | 52.9 |  |  | 67.2 |
Natural gas | MMBtu | 559.9 |  |  | 772.7 |
Evergy Kansas Central |  |  |  |
Commodity contracts |  |  |  |
Power | MWhs | 32.1 |  |  | 41.6 |
Natural gas | MMBtu | 558.7 |  |  | 769.6 |
Evergy Metro |  |  |  |
Commodity contracts |  |  |  |
Power | MWhs | 15.1 |  |  | 18.2 |
Fair value of open derivative positions, gross values before netting agreements and netting of cash collateral [Table Text Block] | The fair values of Evergy's open derivative positions and balance sheet classifications are summarized in the following tables. The fair values below are gross values before netting agreements and netting of cash collateral.
|  | December 31
Evergy |  | 2023 |  | 2022
Non-hedging derivatives | Balance sheet location |
Commodity contracts |  | (millions)
Power | Other assets - current | $ | 23.2 |  |  | $ | 41.6 |
| Other assets - long-term | 35.7 |  |  | 65.6 |
Natural gas | Other assets - current | 68.1 |  |  | 221.0 |
| Other assets - long-term | 6.0 |  |  | 1.6 |
Total derivative assets |  | $ | 133.0 |  |  | $ | 329.8 |
Commodity contracts |  |  |  |
Power | Other liabilities - current | $ | 21.0 |  |  | $ | 41.0 |
| Other liabilities - long-term | 32.9 |  |  | 61.5 |
Natural gas | Other liabilities - current | 68.1 |  |  | 218.8 |
| Other liabilities - long-term | 6.8 |  |  | 1.6 |
Total derivative liabilities |  | $ | 128.8 |  |  | $ | 322.9 |
|  | December 31
Evergy Kansas Central |  | 2023 |  | 2022
Non-hedging derivatives | Balance sheet location |
Commodity contracts |  | (millions)
Power | Other assets - current | $ | 18.3 |  |  | $ | 36.7 |
| Other assets - long-term | 35.7 |  |  | 65.6 |
Natural gas | Other assets - current | 68.1 |  |  | 221.0 |
| Other assets - long-term | 6.0 |  |  | 1.6 |
Total derivative assets |  | $ | 128.1 |  |  | $ | 324.9 |
Commodity contracts |  |  |  |
Power | Other liabilities - current | $ | 14.3 |  |  | $ | 35.6 |
| Other liabilities - long-term | 32.9 |  |  | 61.5 |
Natural gas | Other liabilities - current | 67.0 |  |  | 215.1 |
| Other liabilities - long-term | 6.8 |  |  | 1.6 |
Total derivative liabilities |  | $ | 121.0 |  |  | $ | 313.8 |
|  | December 31
Evergy Metro |  | 2023 |  | 2022
Non-hedging derivatives | Balance sheet location |
Commodity contracts |  | (millions)
Power | Other assets - current | $ | 2.1 |  |  | $ | 3.5 |
Total derivative assets |  | $ | 2.1 |  |  | $ | 3.5 |
Commodity contracts |  |  |  |
Power | Other liabilities - current | $ | 5.7 |  |  | $ | 4.1 |
Total derivative liabilities |  | $ | 5.7 |  |  | $ | 4.1 |
Offsetting Derivative Assets and Liabilities [Table Text Block] | The following tables present the line items on the Evergy Companies' consolidated balance sheets where derivative assets and liabilities are reported. The gross amounts offset in the tables below show the effect of master netting arrangements and include collateral posted to offset the net position.
December 31, 2023 | Evergy | Evergy Kansas Central | Evergy Metro
Derivative Assets | (millions)
Current |  |  |
Gross amounts recognized | $ | 91.3 |  | $ | 86.4 |  | $ | 2.1 |
Gross amounts offset | (78.4) |  | (75.3) |  | (2.1) |
Net amounts presented in other assets - current | $ | 12.9 |  | $ | 11.1 |  | $ | — |
Long-Term |  |  |
Gross amounts recognized | $ | 41.7 |  | $ | 41.7 |  | $ | — |
Gross amounts offset | (11.9) |  | (11.9) |  | — |
Net amounts presented in other assets - long-term | $ | 29.8 |  | $ | 29.8 |  | $ | — |
Derivative Liabilities |  |  |
Current |  |  |
Gross amounts recognized | $ | 89.1 |  | $ | 81.3 |  | $ | 5.7 |
Gross amounts offset | (77.5) |  | (74.4) |  | (2.1) |
Net amounts presented in other liabilities - current | $ | 11.6 |  | $ | 6.9 |  | $ | 3.6 |
Long-Term |  |  |
Gross amounts recognized | $ | 39.7 |  | $ | 39.7 |  | $ | — |
Gross amounts offset | (5.9) |  | (5.9) |  | — |
Net amounts presented in other liabilities - long-term | $ | 33.8 |  | $ | 33.8 |  | $ | — |
December 31, 2022 | Evergy | Evergy Kansas Central | Evergy Metro
Derivative Assets | (millions)
Current |  |  |
Gross amounts recognized | $ | 262.6 |  | $ | 257.7 |  | $ | 3.5 |
Gross amounts offset | (237.4) |  | (232.9) |  | (3.5) |
Net amounts presented in other assets - current | $ | 25.2 |  | $ | 24.8 |  | $ | — |
Long-Term |  |  |
Gross amounts recognized | $ | 67.2 |  | $ | 67.2 |  | $ | — |
Gross amounts offset | (42.1) |  | (42.1) |  | — |
Net amounts presented in other assets - long-term | $ | 25.1 |  | $ | 25.1 |  | $ | — |
Derivative Liabilities |  |  |
Current |  |  |
Gross amounts recognized | $ | 259.8 |  | $ | 250.7 |  | $ | 4.1 |
Gross amounts offset | (234.0) |  | (229.4) |  | (3.5) |
Net amounts presented in other liabilities - current | $ | 25.8 |  | $ | 21.3 |  | $ | 0.6 |
Long-Term |  |  |
Gross amounts recognized | $ | 63.1 |  | $ | 63.1 |  | $ | — |
Gross amounts offset | (36.4) |  | (36.4) |  | — |
Net amounts presented in other liabilities - long-term | $ | 26.7 |  | $ | 26.7 |  | $ | — |
Derivative Instruments, Gain (Loss) [Table Text Block] | The following table summarizes the amounts of gain (loss) recognized in income for the change in fair value of derivatives not designated as hedging instruments for the Evergy Companies.
Location of gain (loss) | Contract type |  |  | 2023 | 2022 | 2021 |
Evergy |  |  |  | (millions)
Operating revenues | Commodity |  |  | $ | 22.9 |  | $ | 84.6 |  | $ | 117.5 |  |
Total |  |  |  | $ | 22.9 |  | $ | 84.6 |  | $ | 117.5 |  |
Evergy Kansas Central |  |  |  |  |  |  |
Operating revenues | Commodity |  |  | $ | 22.9 |  | $ | 84.6 |  | $ | 117.5 |  |
Total |  |  |  | $ | 22.9 |  | $ | 84.6 |  | $ | 117.5 |  |

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