v3.26.1
REVENUE (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers $ 1,425.7 $ 1,354.7 $ 2,776.2 $ 2,649.2
OPERATING REVENUES 1,500.1 1,437.0 2,943.8 2,811.5
Revenue, Remaining Performance Obligation, Amount 8,900.0   8,900.0  
Revenue Not from Contract with Customer 74.4 82.3 167.6 162.3
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]        
Revenue, Remaining Performance Obligation, Amount 8,900.0   $ 8,900.0  
Weighted Average [Member]        
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]        
ContractWithCustomerRemainingContractDuration     15 years  
Residential        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 528.4 491.9 $ 1,011.1 1,001.8
Commercial        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 507.1 467.6 947.2 904.1
Industrial        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 170.2 160.5 330.5 305.5
Other retail        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 12.2 10.7 23.6 20.8
Total electric retail        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 1,217.9 1,130.7 2,312.4 2,232.2
Wholesale        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 68.1 91.2 175.2 139.8
Transmission        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 134.5 128.3 268.1 262.3
Other        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 5.2 4.5 20.5 14.9
Evergy Kansas Central        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 748.2 697.7 1,485.8 1,404.7
OPERATING REVENUES 769.5 733.5 1,542.6 1,442.6
Revenue, Remaining Performance Obligation, Amount 4,800.0   4,800.0  
Revenue Not from Contract with Customer 21.3 35.8 56.8 37.9
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]        
Revenue, Remaining Performance Obligation, Amount 4,800.0   $ 4,800.0  
Evergy Kansas Central | Weighted Average [Member]        
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]        
ContractWithCustomerRemainingContractDuration     14 years  
Evergy Kansas Central | Residential        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 240.5 208.4 $ 457.8 432.1
Evergy Kansas Central | Commercial        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 212.7 192.8 401.2 376.4
Evergy Kansas Central | Industrial        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 111.4 101.0 220.1 197.1
Evergy Kansas Central | Other retail        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 5.6 5.5 11.4 11.6
Evergy Kansas Central | Total electric retail        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 570.2 507.7 1,090.5 1,017.2
Evergy Kansas Central | Wholesale        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 52.9 70.3 139.5 142.8
Evergy Kansas Central | Transmission        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 126.2 119.6 250.9 242.8
Evergy Kansas Central | Other        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers (1.1) 0.1 4.9 1.9
Evergy Metro        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 436.4 425.1 824.4 775.3
OPERATING REVENUES 488.7 471.2 934.1 898.9
Revenue, Remaining Performance Obligation, Amount 2,300.0   2,300.0  
Revenue Not from Contract with Customer 52.3 46.1 109.7 123.6
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]        
Revenue, Remaining Performance Obligation, Amount 2,300.0   $ 2,300.0  
Evergy Metro | Weighted Average [Member]        
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]        
ContractWithCustomerRemainingContractDuration     17 years  
Evergy Metro | Residential        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 176.0 175.1 $ 331.4 342.0
Evergy Metro | Commercial        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 200.9 187.7 370.3 359.4
Evergy Metro | Industrial        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 33.8 34.8 63.3 63.1
Evergy Metro | Other retail        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 3.7 3.1 6.5 5.4
Evergy Metro | Total electric retail        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 414.4 400.7 771.5 769.9
Evergy Metro | Wholesale        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 15.2 18.6 37.1 (10.4)
Evergy Metro | Transmission        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 6.1 5.9 12.4 13.3
Evergy Metro | Other        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers $ 0.7 $ (0.1) $ 3.4 $ 2.5