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PENSION PLANS AND POST-RETIREMENT BENEFITS (Tables)
3 Months Ended
Mar. 31, 2023
Retirement Benefits [Abstract]  
Schedule of Net Benefit Costs
The following tables provide the components of net periodic benefit costs prior to the effects of capitalization and sharing with joint owners of power plants.
Pension BenefitsPost-Retirement Benefits
Three Months Ended March 31, 2023EvergyEvergy Kansas CentralEvergy MetroEvergyEvergy Kansas CentralEvergy Metro
Components of net periodic benefit costs(millions)
Service cost$11.2 $4.6 $6.6 $0.4 $0.2 $0.2 
Interest cost22.4 11.4 10.8 2.8 1.4 1.3 
Expected return on plan assets(21.8)(11.0)(10.8)(3.0)(1.5)(1.4)
Prior service cost0.5 0.5 — — — (0.1)
Recognized net actuarial gain(5.6)(0.8)(4.6)(1.0)(0.5)(0.5)
Settlement benefits (costs)(15.9)0.4 (16.3)— — — 
Net periodic benefit costs before regulatory adjustment and intercompany allocations
(9.2)5.1 (14.3)(0.8)(0.4)(0.5)
Regulatory adjustment33.5 7.4 25.9 (0.1)(0.6)0.6 
Intercompany allocations— (0.5)(0.2)— 0.1 — 
Net periodic benefit costs (income)$24.3 $12.0 $11.4 $(0.9)$(0.9)$0.1 
Pension BenefitsPost-Retirement Benefits
Three Months Ended March 31, 2022EvergyEvergy Kansas CentralEvergy MetroEvergyEvergy Kansas CentralEvergy Metro
Components of net periodic benefit costs(millions)
Service cost$19.9 $7.7 $12.2 $0.8 $0.4 $0.4 
Interest cost19.8 9.7 9.9 2.0 1.0 1.0 
Expected return on plan assets(26.0)(12.8)(14.1)(2.5)(1.6)(0.9)
Prior service cost0.5 0.5 — 0.1 0.1 (0.4)
Recognized net actuarial (gain)/loss8.7 6.4 9.7 (0.1)(0.1)(0.2)
Net periodic benefit costs before regulatory adjustment and intercompany allocations
22.9 11.5 17.7 0.3 (0.2)(0.1)
Regulatory adjustment15.9 2.9 6.5 (0.6)(0.7)0.6 
Intercompany allocations— 0.5 (4.5)— 0.1 (0.1)
Net periodic benefit costs (income)$38.8 $14.9 $19.7 $(0.3)$(0.8)$0.4