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TAXES - Net Operating Loss Carryforwards (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Operating Loss Carryforwards [Line Items] |  |
Deferred tax benefits | $ 42.2 | $ 132.4
Operating loss carryforwards of federal income tax benefit | 7.1 |
Tax credit carryforward, amount | 379.6 |
Federal Alternative Minimum Tax Credit Carryforward |  |
Operating Loss Carryforwards [Line Items] |  |
Tax credit carryforward, amount |  | 37.9
Internal Revenue Service (IRS) |  |
Operating Loss Carryforwards [Line Items] |  |
Tax benefits related to NOLs | 7.1 |
State and Local Jurisdiction |  |
Operating Loss Carryforwards [Line Items] |  |
Deferred tax benefits | 8.8 | 31.0
Operating loss carryforwards of federal income tax benefit | 7.1 |
Evergy Kansas Central |  |
Operating Loss Carryforwards [Line Items] |  |
Tax credit carryforward, amount | 176.5 |
Evergy Kansas Central | Federal Alternative Minimum Tax Credit Carryforward |  |
Operating Loss Carryforwards [Line Items] |  |
Tax credit carryforward, amount |  | 13.4
Evergy Kansas Central | Internal Revenue Service (IRS) |  |
Operating Loss Carryforwards [Line Items] |  |
Deferred tax benefits |  | 12.3
Evergy Kansas Central | State and Local Jurisdiction |  |
Operating Loss Carryforwards [Line Items] |  |
Deferred tax benefits |  | 10.8
Evergy Metro |  |
Operating Loss Carryforwards [Line Items] |  |
Tax credit carryforward, amount | 195.9 |
Evergy Metro | Internal Revenue Service (IRS) |  |
Operating Loss Carryforwards [Line Items] |  |
Deferred tax benefits |  | 56.2
Evergy Metro | State and Local Jurisdiction |  |
Operating Loss Carryforwards [Line Items] |  |
Deferred tax benefits | 0.2 | $ 5.7
2005 |  |
Operating Loss Carryforwards [Line Items] |  |
Deferred tax benefits | 10.2 |
Tax credit carryforward, amount | 0.1 |
2005 | Evergy Kansas Central |  |
Operating Loss Carryforwards [Line Items] |  |
Tax credit carryforward, amount | 0.0 |
2005 | Evergy Metro |  |
Operating Loss Carryforwards [Line Items] |  |
Tax credit carryforward, amount | 0.0 |
2006 |  |
Operating Loss Carryforwards [Line Items] |  |
Deferred tax benefits | 32.0 |
Tax credit carryforward, amount | 0.1 |
2006 | Evergy Kansas Central |  |
Operating Loss Carryforwards [Line Items] |  |
Tax credit carryforward, amount | 0.0 |
2006 | Evergy Metro |  |
Operating Loss Carryforwards [Line Items] |  |
Tax credit carryforward, amount | 0.0 |
2014 |  |
Operating Loss Carryforwards [Line Items] |  |
Tax credit carryforward, amount | 24.1 |
2014 | Evergy Kansas Central |  |
Operating Loss Carryforwards [Line Items] |  |
Tax credit carryforward, amount | 10.7 |
2014 | Evergy Metro |  |
Operating Loss Carryforwards [Line Items] |  |
Tax credit carryforward, amount | 13.0 |
2015 |  |
Operating Loss Carryforwards [Line Items] |  |
Tax credit carryforward, amount | 24.7 |
2015 | Evergy Kansas Central |  |
Operating Loss Carryforwards [Line Items] |  |
Tax credit carryforward, amount | 10.9 |
2015 | Evergy Metro |  |
Operating Loss Carryforwards [Line Items] |  |
Tax credit carryforward, amount | 13.2 |
2016 |  |
Operating Loss Carryforwards [Line Items] |  |
Tax credit carryforward, amount | 27.1 |
2016 | Evergy Kansas Central |  |
Operating Loss Carryforwards [Line Items] |  |
Tax credit carryforward, amount | 11.0 |
2016 | Evergy Metro |  |
Operating Loss Carryforwards [Line Items] |  |
Tax credit carryforward, amount | 12.4 |
2017 |  |
Operating Loss Carryforwards [Line Items] |  |
Tax credit carryforward, amount | 43.9 |
2017 | Evergy Kansas Central |  |
Operating Loss Carryforwards [Line Items] |  |
Tax credit carryforward, amount | 35.1 |
2017 | Evergy Metro |  |
Operating Loss Carryforwards [Line Items] |  |
Tax credit carryforward, amount | $ 8.2 |

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- Definition The amount of net operating loss carryforwards acquired in in the GMO acquisition. + References No definition available. + Details
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- Definition Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32559-109319 + Details
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