v3.26.1
RELATED PARTY TRANSACTIONS AND RELATIONSHIPS (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Related Party Transaction [Line Items]          
Due to Related Party, Current $ (530.2)   $ (530.2)   $ (654.3)
Evergy Metro          
Related Party Transaction [Line Items]          
Due to Related Party, Current (215.6)   (215.6)   (257.9)
Evergy Metro | Evergy Missouri West          
Related Party Transaction [Line Items]          
Due from related party 87.3   87.3   96.2
Evergy Metro | Evergy Missouri West | Operating Expenses and Capital Costs Billed          
Related Party Transaction [Line Items]          
Related party transaction 28.0 $ 29.4 52.3 $ 55.2  
Evergy Metro | Evergy Kansas Central          
Related Party Transaction [Line Items]          
Due from related party 30.1   30.1    
Due to Related Party, Current         (10.6)
Evergy Metro | Evergy Kansas Central | Operating Expenses and Capital Costs Billed          
Related Party Transaction [Line Items]          
Related party transaction 38.1 35.2 70.3 68.1  
Evergy Metro | Evergy          
Related Party Transaction [Line Items]          
Due from related party 13.1   13.1   16.5
Evergy Metro | Evergy | Income Tax Receivable          
Related Party Transaction [Line Items]          
Due to Related Party, Current (14.3)   (14.3)   0.0
Evergy Metro | Related Party [Member]          
Related Party Transaction [Line Items]          
Due from related party 130.7   130.7   125.3
Due to Related Party, Current (0.2)   (0.2)   (23.2)
Evergy Metro | Related Party [Member] | Evergy Inc Money Pool          
Related Party Transaction [Line Items]          
Due from related party 0.0   0.0   0.0
Due to Related Party, Current 0.0   0.0   0.0
Evergy Kansas Central          
Related Party Transaction [Line Items]          
Due to Related Party, Current (228.6)   (228.6)   (256.4)
Evergy Kansas Central | Evergy Missouri West          
Related Party Transaction [Line Items]          
Due from related party 30.6   30.6   34.6
Evergy Kansas Central | Evergy Missouri West | Operating Expenses and Capital Costs Billed          
Related Party Transaction [Line Items]          
Related party transaction 69.1 61.9 149.0 69.6  
Evergy Kansas Central | Evergy Metro          
Related Party Transaction [Line Items]          
Due from related party         10.6
Due to Related Party, Current (30.1)   (30.1)    
Evergy Kansas Central | Evergy Metro | Operating Expenses and Capital Costs Billed          
Related Party Transaction [Line Items]          
Related party transaction 13.5 $ 13.5 25.8 $ 26.5  
Evergy Kansas Central | Evergy          
Related Party Transaction [Line Items]          
Due to Related Party, Current (15.9)   (15.9)   (13.3)
Evergy Kansas Central | Evergy | Income Tax Receivable          
Related Party Transaction [Line Items]          
Due to Related Party, Current (3.0)   (3.0)   (14.3)
Evergy Kansas Central | Related Party [Member]          
Related Party Transaction [Line Items]          
Due from related party 34.4   34.4   59.8
Due to Related Party, Current (49.8)   (49.8)   (27.9)
Evergy Kansas Central | Related Party [Member] | Evergy Inc Money Pool          
Related Party Transaction [Line Items]          
Due from related party 0.0   0.0   0.0
Due to Related Party, Current $ 0.0   $ 0.0   $ 0.0
Jointly Owned Electricity Generation Plant Iatan No 1 And 2 | Evergy Missouri West          
Related Party Transaction [Line Items]          
Jointly owned utility plant, proportionate ownership share 18.00%   18.00%    
Jeffrey Energy Center | Evergy Missouri West          
Related Party Transaction [Line Items]          
Jointly owned utility plant, proportionate ownership share 8.00%   8.00%    
La Cygne Station | Evergy Kansas Central          
Related Party Transaction [Line Items]          
Jointly owned utility plant, proportionate ownership share 50.00%   50.00%