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LEASES - Schedule of Lease Expense (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Finance lease costs      
Amortization of right-of-use assets $ 6.1 $ 5.3 $ 5.1
Interest on lease liabilities 2.3 2.4 2.5
Operating lease costs 20.5 21.9 21.8
Short-term lease costs 4.0 4.9 5.9
Variable lease costs for renewable purchase power agreements 266.5 318.0 280.3
Total lease costs 299.4 352.5 315.6
Evergy Kansas Central      
Finance lease costs      
Amortization of right-of-use assets 5.5 4.7 4.5
Interest on lease liabilities 2.2 2.2 2.4
Operating lease costs 10.0 12.1 12.9
Short-term lease costs 1.5 1.4 1.8
Variable lease costs for renewable purchase power agreements 122.6 155.2 145.8
Total lease costs 141.8 175.6 167.4
Evergy Metro      
Finance lease costs      
Amortization of right-of-use assets 0.5 0.5 0.4
Interest on lease liabilities 0.1 0.1 0.1
Operating lease costs 8.6 8.7 9.0
Short-term lease costs 2.2 3.3 3.0
Variable lease costs for renewable purchase power agreements 107.5 122.6 101.0
Total lease costs $ 118.9 $ 135.2 $ 113.5