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LEASES - Schedule of Lease Expense (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Finance lease costs    
Amortization of right-of-use assets $ 7.7 $ 5.2
Interest on lease liabilities 3.1 2.9
Operating lease costs 22.9 23.8
Short-term lease costs 2.1 4.0
Variable lease costs for renewable purchase power agreements 296.6 313.0
Total lease costs 332.4 348.9
Evergy Kansas Central    
Finance lease costs    
Amortization of right-of-use assets 7.2 5.0
Interest on lease liabilities 2.8 2.7
Operating lease costs 11.9 13.2
Short-term lease costs 0.5 1.2
Variable lease costs for renewable purchase power agreements 135.6 130.8
Total lease costs 158.0 152.9
Evergy Metro    
Finance lease costs    
Amortization of right-of-use assets 0.3 0.1
Interest on lease liabilities 0.1 0.1
Operating lease costs 9.3 9.2
Short-term lease costs 1.5 2.6
Variable lease costs for renewable purchase power agreements 112.2 129.2
Total lease costs $ 123.4 $ 141.2