v3.26.1
TAXES - Income Tax Expense (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Investment Tax Credits        
Income Tax Expense (Benefit), Total $ 16.4 $ 10.0 $ 19.8 $ 19.6
Effect Of [Abstract]        
Effective Income Tax Rate Reconciliation, Percent, Total 7.00% 5.50% 5.10% 6.10%
Evergy Kansas Central        
Investment Tax Credits        
Income Tax Expense (Benefit), Total $ 9.1 $ 6.0 $ 11.5 $ 10.9
Effect Of [Abstract]        
Effective Income Tax Rate Reconciliation, Percent, Total 6.00% 4.60% 3.80% 4.50%
Evergy Metro        
Investment Tax Credits        
Income Tax Expense (Benefit), Total $ 13.3 $ 9.7 $ 16.1 $ 16.3
Effect Of [Abstract]        
Effective Income Tax Rate Reconciliation, Percent, Total 14.60% 12.40% 12.30% 13.40%