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PENSION PLANS AND POST-RETIREMENT BENEFITS PENSION PLANS AND POST-RETIREMENT BENEFITS - Schedule of Components of Net Periodic Benefit Costs (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment, Tax [Abstract]    
Total recognized in OCI or regulatory asset/liability $ (1.3) $ (1.4)
Pension Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 11.2 19.9
Interest cost 22.4 19.8
Expected return on plan assets (21.8) (26.0)
Prior service cost 0.5 0.5
Recognized net actuarial (gain) loss (5.6) 8.7
Settlement and special termination benefits (15.9)  
Net periodic benefit costs before regulatory adjustment and intercompany allocations (9.2) 22.9
Regulatory adjustment 33.5 15.9
Intercompany allocations 0.0 0.0
Net periodic benefit costs (income) 24.3 38.8
Post-Retirement Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 0.4 0.8
Interest cost 2.8 2.0
Expected return on plan assets (3.0) (2.5)
Prior service cost 0.0 0.1
Recognized net actuarial (gain) loss (1.0) (0.1)
Settlement and special termination benefits 0.0  
Net periodic benefit costs before regulatory adjustment and intercompany allocations (0.8) 0.3
Regulatory adjustment (0.1) (0.6)
Intercompany allocations 0.0 0.0
Net periodic benefit costs (income) (0.9) (0.3)
Evergy Kansas Central | Pension Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 4.6 7.7
Interest cost 11.4 9.7
Expected return on plan assets (11.0) (12.8)
Prior service cost 0.5 0.5
Recognized net actuarial (gain) loss (0.8) 6.4
Settlement and special termination benefits 0.4  
Net periodic benefit costs before regulatory adjustment and intercompany allocations 5.1 11.5
Regulatory adjustment 7.4 2.9
Intercompany allocations (0.5) 0.5
Net periodic benefit costs (income) 12.0 14.9
Evergy Kansas Central | Post-Retirement Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 0.2 0.4
Interest cost 1.4 1.0
Expected return on plan assets (1.5) (1.6)
Prior service cost 0.0 0.1
Recognized net actuarial (gain) loss (0.5) (0.1)
Settlement and special termination benefits 0.0  
Net periodic benefit costs before regulatory adjustment and intercompany allocations (0.4) (0.2)
Regulatory adjustment (0.6) (0.7)
Intercompany allocations 0.1 0.1
Net periodic benefit costs (income) (0.9) (0.8)
Evergy Metro    
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment, Tax [Abstract]    
Total recognized in OCI or regulatory asset/liability 0.1 0.0
Evergy Metro | Pension Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 6.6 12.2
Interest cost 10.8 9.9
Expected return on plan assets (10.8) (14.1)
Prior service cost 0.0 0.0
Recognized net actuarial (gain) loss (4.6) 9.7
Settlement and special termination benefits (16.3)  
Net periodic benefit costs before regulatory adjustment and intercompany allocations (14.3) 17.7
Regulatory adjustment 25.9 6.5
Intercompany allocations (0.2) (4.5)
Net periodic benefit costs (income) 11.4 19.7
Evergy Metro | Post-Retirement Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 0.2 0.4
Interest cost 1.3 1.0
Expected return on plan assets (1.4) (0.9)
Prior service cost (0.1) (0.4)
Recognized net actuarial (gain) loss (0.5) (0.2)
Settlement and special termination benefits 0.0  
Net periodic benefit costs before regulatory adjustment and intercompany allocations (0.5) (0.1)
Regulatory adjustment 0.6 0.6
Intercompany allocations 0.0 (0.1)
Net periodic benefit costs (income) $ 0.1 $ 0.4