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TAXES - Tax Credit Carryforwards (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Tax Credit Carryforward [Line Items]    
Tax credit carryforward, amount $ 379.6  
Evergy Kansas Central    
Tax Credit Carryforward [Line Items]    
Tax credit carryforward, amount 176.5  
Evergy Metro    
Tax Credit Carryforward [Line Items]    
Tax credit carryforward, amount 195.9  
General Business Tax Credit Carryforward    
Tax Credit Carryforward [Line Items]    
Tax credit carryforward, amount 379.6 $ 379.0
Amount of tax credit acquired in business combination 0.2  
Valuation allowance 0.2  
General Business Tax Credit Carryforward | Evergy Kansas Central    
Tax Credit Carryforward [Line Items]    
Tax credit carryforward, amount 176.5 168.8
General Business Tax Credit Carryforward | Evergy Metro    
Tax Credit Carryforward [Line Items]    
Tax credit carryforward, amount 195.9 203.2
State and Local Jurisdiction    
Tax Credit Carryforward [Line Items]    
Tax credit carryforward, amount   169.9
State and Local Jurisdiction | Evergy Kansas Central    
Tax Credit Carryforward [Line Items]    
Tax credit carryforward, amount   168.5
State and Local Jurisdiction | Evergy Metro    
Tax Credit Carryforward [Line Items]    
Tax credit carryforward, amount   1.2
Federal Alternative Minimum Tax Credit Carryforward [Member]    
Tax Credit Carryforward [Line Items]    
Tax credit carryforward, amount   37.9
Federal Alternative Minimum Tax Credit Carryforward [Member] | Evergy Kansas Central    
Tax Credit Carryforward [Line Items]    
Tax credit carryforward, amount   $ 13.4
2003    
Tax Credit Carryforward [Line Items]    
Tax credit carryforward, amount 0.1  
2003 | Evergy Kansas Central    
Tax Credit Carryforward [Line Items]    
Tax credit carryforward, amount 0.0  
2003 | Evergy Metro    
Tax Credit Carryforward [Line Items]    
Tax credit carryforward, amount 0.0  
2004    
Tax Credit Carryforward [Line Items]    
Tax credit carryforward, amount 0.1  
2004 | Evergy Kansas Central    
Tax Credit Carryforward [Line Items]    
Tax credit carryforward, amount 0.0  
2004 | Evergy Metro    
Tax Credit Carryforward [Line Items]    
Tax credit carryforward, amount 0.0  
2005    
Tax Credit Carryforward [Line Items]    
Tax credit carryforward, amount 0.1  
2005 | Evergy Kansas Central    
Tax Credit Carryforward [Line Items]    
Tax credit carryforward, amount 0.0  
2005 | Evergy Metro    
Tax Credit Carryforward [Line Items]    
Tax credit carryforward, amount 0.0  
2006    
Tax Credit Carryforward [Line Items]    
Tax credit carryforward, amount 0.1  
2006 | Evergy Kansas Central    
Tax Credit Carryforward [Line Items]    
Tax credit carryforward, amount 0.0  
2006 | Evergy Metro    
Tax Credit Carryforward [Line Items]    
Tax credit carryforward, amount 0.0  
2007    
Tax Credit Carryforward [Line Items]    
Tax credit carryforward, amount 0.1  
2007 | Evergy Kansas Central    
Tax Credit Carryforward [Line Items]    
Tax credit carryforward, amount 0.0  
2007 | Evergy Metro    
Tax Credit Carryforward [Line Items]    
Tax credit carryforward, amount 0.0  
2008    
Tax Credit Carryforward [Line Items]    
Tax credit carryforward, amount 27.4  
2008 | Evergy Kansas Central    
Tax Credit Carryforward [Line Items]    
Tax credit carryforward, amount 0.5  
2008 | Evergy Metro    
Tax Credit Carryforward [Line Items]    
Tax credit carryforward, amount 26.6  
2009    
Tax Credit Carryforward [Line Items]    
Tax credit carryforward, amount 47.7  
2009 | Evergy Kansas Central    
Tax Credit Carryforward [Line Items]    
Tax credit carryforward, amount 0.2  
2009 | Evergy Metro    
Tax Credit Carryforward [Line Items]    
Tax credit carryforward, amount 47.3  
2010    
Tax Credit Carryforward [Line Items]    
Tax credit carryforward, amount 18.3  
2010 | Evergy Kansas Central    
Tax Credit Carryforward [Line Items]    
Tax credit carryforward, amount 0.0  
2010 | Evergy Metro    
Tax Credit Carryforward [Line Items]    
Tax credit carryforward, amount 18.2  
2011    
Tax Credit Carryforward [Line Items]    
Tax credit carryforward, amount 13.3  
2011 | Evergy Kansas Central    
Tax Credit Carryforward [Line Items]    
Tax credit carryforward, amount 0.0  
2011 | Evergy Metro    
Tax Credit Carryforward [Line Items]    
Tax credit carryforward, amount 13.2  
2012    
Tax Credit Carryforward [Line Items]    
Tax credit carryforward, amount 12.8  
2012 | Evergy Kansas Central    
Tax Credit Carryforward [Line Items]    
Tax credit carryforward, amount 2.0  
2012 | Evergy Metro    
Tax Credit Carryforward [Line Items]    
Tax credit carryforward, amount 10.7  
2013    
Tax Credit Carryforward [Line Items]    
Tax credit carryforward, amount 24.3  
2013 | Evergy Kansas Central    
Tax Credit Carryforward [Line Items]    
Tax credit carryforward, amount 11.3  
2013 | Evergy Metro    
Tax Credit Carryforward [Line Items]    
Tax credit carryforward, amount 12.9  
2014    
Tax Credit Carryforward [Line Items]    
Tax credit carryforward, amount 24.1  
2014 | Evergy Kansas Central    
Tax Credit Carryforward [Line Items]    
Tax credit carryforward, amount 10.7  
2014 | Evergy Metro    
Tax Credit Carryforward [Line Items]    
Tax credit carryforward, amount 13.0  
2015    
Tax Credit Carryforward [Line Items]    
Tax credit carryforward, amount 24.7  
2015 | Evergy Kansas Central    
Tax Credit Carryforward [Line Items]    
Tax credit carryforward, amount 10.9  
2015 | Evergy Metro    
Tax Credit Carryforward [Line Items]    
Tax credit carryforward, amount 13.2  
2016    
Tax Credit Carryforward [Line Items]    
Tax credit carryforward, amount 27.1  
2016 | Evergy Kansas Central    
Tax Credit Carryforward [Line Items]    
Tax credit carryforward, amount 11.0  
2016 | Evergy Metro    
Tax Credit Carryforward [Line Items]    
Tax credit carryforward, amount 12.4  
2017    
Tax Credit Carryforward [Line Items]    
Tax credit carryforward, amount 43.9  
2017 | Evergy Kansas Central    
Tax Credit Carryforward [Line Items]    
Tax credit carryforward, amount 35.1  
2017 | Evergy Metro    
Tax Credit Carryforward [Line Items]    
Tax credit carryforward, amount 8.2  
2018    
Tax Credit Carryforward [Line Items]    
Tax credit carryforward, amount 43.9  
2018 | Evergy Kansas Central    
Tax Credit Carryforward [Line Items]    
Tax credit carryforward, amount 36.3  
2018 | Evergy Metro    
Tax Credit Carryforward [Line Items]    
Tax credit carryforward, amount 7.5  
2019    
Tax Credit Carryforward [Line Items]    
Tax credit carryforward, amount 37.7  
2019 | Evergy Kansas Central    
Tax Credit Carryforward [Line Items]    
Tax credit carryforward, amount 30.9  
2019 | Evergy Metro    
Tax Credit Carryforward [Line Items]    
Tax credit carryforward, amount 6.7  
2020    
Tax Credit Carryforward [Line Items]    
Tax credit carryforward, amount 33.9  
2020 | Evergy Kansas Central    
Tax Credit Carryforward [Line Items]    
Tax credit carryforward, amount 27.6  
2020 | Evergy Metro    
Tax Credit Carryforward [Line Items]    
Tax credit carryforward, amount $ 6.0