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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Supplemental Cash Flow Information (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Cash paid for (received from):      
Interest, net of amount capitalized $ 367.6 $ 329.5 $ 255.9
Income taxes, net of refunds (46.5) (5.2) (0.9)
Non-cash investing transactions:      
Property, plant and equipment additions (reductions) 463.3 186.0 (7.8)
Non-cash financing transactions:      
Issuance of stock for compensation and reinvested dividends 0.9 (0.3) 0.5
Variable Interest Entities      
Cash paid for (received from):      
Interest of VIEs 0.8 1.6 2.3
Evergy Kansas Central      
Cash paid for (received from):      
Interest, net of amount capitalized 157.5 143.0 155.3
Income taxes, net of refunds 4.7 29.9 37.5
Non-cash investing transactions:      
Property, plant and equipment additions (reductions) 235.4 92.1 (32.5)
Evergy Kansas Central | Variable Interest Entities      
Cash paid for (received from):      
Interest of VIEs 0.8 1.6 2.3
Evergy Metro      
Cash paid for (received from):      
Interest, net of amount capitalized 109.9 118.4 129.4
Income taxes, net of refunds 4.8 77.0 31.2
Non-cash investing transactions:      
Property, plant and equipment additions (reductions) $ 192.5 $ 80.7 $ 19.2