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FAIR VALUE MEASUREMENTS - Recurring (Details) - Fair Value, Measurements, Recurring - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Assets    
Total nuclear decommissioning trust $ 652.1 $ 573.2
Total rabbi trust 46.3 45.5
Total self-insured health plan trust 13.2 9.9
Total Assets 711.6 628.6
Level 1    
Assets    
Total nuclear decommissioning trust 560.6 493.0
Total rabbi trust 0.5 0.6
Total self-insured health plan trust 8.0 4.6
Total Assets 569.1 498.2
Level 2    
Assets    
Total nuclear decommissioning trust 47.8 36.2
Total rabbi trust 0.0 0.0
Total self-insured health plan trust 5.2 5.3
Total Assets 53.0 41.5
Level 3    
Assets    
Total nuclear decommissioning trust 0.0 0.0
Total rabbi trust 0.0 0.0
Total self-insured health plan trust 0.0 0.0
Total Assets 0.0 0.0
NAV    
Assets    
Total nuclear decommissioning trust 43.7 44.0
Total rabbi trust 45.8 44.9
Total self-insured health plan trust 0.0 0.0
Total Assets 89.5 88.9
Evergy Kansas Central    
Assets    
Total nuclear decommissioning trust 309.8 272.5
Total rabbi trust 32.7 31.7
Total Assets 342.5 304.2
Evergy Kansas Central | Core bond fund    
Assets    
Total nuclear decommissioning trust 40.6 39.3
Total rabbi trust 25.6 25.3
Evergy Kansas Central | High-yield bond fund    
Assets    
Total nuclear decommissioning trust 25.0 22.3
Evergy Kansas Central | Emerging markets bond fund    
Assets    
Total nuclear decommissioning trust 21.0 19.4
Evergy Kansas Central | Combination debt/equity/other fund    
Assets    
Total nuclear decommissioning trust 20.1 16.4
Total rabbi trust 7.1 6.3
Evergy Kansas Central | Alternative investments fund    
Assets    
Total nuclear decommissioning trust 23.2 23.9
Evergy Kansas Central | Real estate securities fund    
Assets    
Total nuclear decommissioning trust 12.9 12.6
Evergy Kansas Central | Cash equivalents    
Assets    
Total nuclear decommissioning trust 0.5 0.5
Total rabbi trust   0.1
Evergy Kansas Central | Level 1    
Assets    
Total nuclear decommissioning trust 266.1 228.5
Total rabbi trust 0.0 0.1
Total Assets 266.1 228.6
Evergy Kansas Central | Level 1 | Core bond fund    
Assets    
Total nuclear decommissioning trust 40.6 39.3
Total rabbi trust 0.0 0.0
Evergy Kansas Central | Level 1 | High-yield bond fund    
Assets    
Total nuclear decommissioning trust 25.0 22.3
Evergy Kansas Central | Level 1 | Emerging markets bond fund    
Assets    
Total nuclear decommissioning trust 21.0 19.4
Evergy Kansas Central | Level 1 | Combination debt/equity/other fund    
Assets    
Total nuclear decommissioning trust 20.1 16.4
Total rabbi trust 0.0 0.0
Evergy Kansas Central | Level 1 | Alternative investments fund    
Assets    
Total nuclear decommissioning trust 0.0 0.0
Evergy Kansas Central | Level 1 | Real estate securities fund    
Assets    
Total nuclear decommissioning trust 0.0 0.0
Evergy Kansas Central | Level 1 | Cash equivalents    
Assets    
Total nuclear decommissioning trust 0.5 0.5
Total rabbi trust   0.1
Evergy Kansas Central | Level 2    
Assets    
Total nuclear decommissioning trust 0.0 0.0
Total rabbi trust 0.0 0.0
Total Assets 0.0 0.0
Evergy Kansas Central | Level 2 | Core bond fund    
Assets    
Total nuclear decommissioning trust 0.0 0.0
Total rabbi trust 0.0 0.0
Evergy Kansas Central | Level 2 | High-yield bond fund    
Assets    
Total nuclear decommissioning trust 0.0 0.0
Evergy Kansas Central | Level 2 | Emerging markets bond fund    
Assets    
Total nuclear decommissioning trust 0.0 0.0
Evergy Kansas Central | Level 2 | Combination debt/equity/other fund    
Assets    
Total nuclear decommissioning trust 0.0 0.0
Total rabbi trust 0.0 0.0
Evergy Kansas Central | Level 2 | Alternative investments fund    
Assets    
Total nuclear decommissioning trust 0.0 0.0
Evergy Kansas Central | Level 2 | Real estate securities fund    
Assets    
Total nuclear decommissioning trust 0.0 0.0
Evergy Kansas Central | Level 2 | Cash equivalents    
Assets    
Total nuclear decommissioning trust 0.0 0.0
Total rabbi trust   0.0
Evergy Kansas Central | Level 3    
Assets    
Total nuclear decommissioning trust 0.0 0.0
Total rabbi trust 0.0 0.0
Total Assets 0.0 0.0
Evergy Kansas Central | Level 3 | Core bond fund    
Assets    
Total nuclear decommissioning trust 0.0 0.0
Total rabbi trust 0.0 0.0
Evergy Kansas Central | Level 3 | High-yield bond fund    
Assets    
Total nuclear decommissioning trust 0.0 0.0
Evergy Kansas Central | Level 3 | Emerging markets bond fund    
Assets    
Total nuclear decommissioning trust 0.0 0.0
Evergy Kansas Central | Level 3 | Combination debt/equity/other fund    
Assets    
Total nuclear decommissioning trust 0.0 0.0
Total rabbi trust 0.0 0.0
Evergy Kansas Central | Level 3 | Alternative investments fund    
Assets    
Total nuclear decommissioning trust 0.0 0.0
Evergy Kansas Central | Level 3 | Real estate securities fund    
Assets    
Total nuclear decommissioning trust 0.0 0.0
Evergy Kansas Central | Level 3 | Cash equivalents    
Assets    
Total nuclear decommissioning trust 0.0 0.0
Total rabbi trust   0.0
Evergy Kansas Central | NAV    
Assets    
Total nuclear decommissioning trust 43.7 44.0
Total rabbi trust 32.7 31.6
Total Assets 76.4 75.6
Evergy Kansas Central | NAV | Core bond fund    
Assets    
Total nuclear decommissioning trust 0.0 0.0
Total rabbi trust 25.6 25.3
Evergy Kansas Central | NAV | High-yield bond fund    
Assets    
Total nuclear decommissioning trust 0.0 0.0
Evergy Kansas Central | NAV | Emerging markets bond fund    
Assets    
Total nuclear decommissioning trust 0.0 0.0
Evergy Kansas Central | NAV | Combination debt/equity/other fund    
Assets    
Total nuclear decommissioning trust 0.0 0.0
Total rabbi trust 7.1 6.3
Evergy Kansas Central | NAV | Alternative investments fund    
Assets    
Total nuclear decommissioning trust 23.2 23.9
Evergy Kansas Central | NAV | Real estate securities fund    
Assets    
Total nuclear decommissioning trust 12.9 12.6
Evergy Kansas Central | NAV | Cash equivalents    
Assets    
Total nuclear decommissioning trust 0.0 0.0
Total rabbi trust   0.0
Evergy Kansas Central | Domestic | Equity securities    
Assets    
Total nuclear decommissioning trust 102.7 86.1
Evergy Kansas Central | Domestic | Level 1 | Equity securities    
Assets    
Total nuclear decommissioning trust 95.1 78.6
Evergy Kansas Central | Domestic | Level 2 | Equity securities    
Assets    
Total nuclear decommissioning trust 0.0 0.0
Evergy Kansas Central | Domestic | Level 3 | Equity securities    
Assets    
Total nuclear decommissioning trust 0.0 0.0
Evergy Kansas Central | Domestic | NAV | Equity securities    
Assets    
Total nuclear decommissioning trust 7.6 7.5
Evergy Kansas Central | International | Equity securities    
Assets    
Total nuclear decommissioning trust 63.8 52.0
Evergy Kansas Central | International | Level 1 | Equity securities    
Assets    
Total nuclear decommissioning trust 63.8 52.0
Evergy Kansas Central | International | Level 2 | Equity securities    
Assets    
Total nuclear decommissioning trust 0.0 0.0
Evergy Kansas Central | International | Level 3 | Equity securities    
Assets    
Total nuclear decommissioning trust 0.0 0.0
Evergy Kansas Central | International | NAV | Equity securities    
Assets    
Total nuclear decommissioning trust 0.0 0.0
Evergy Metro    
Assets    
Total nuclear decommissioning trust 342.3 300.7
Total self-insured health plan trust 13.2 9.9
Total Assets 355.5 310.6
Evergy Metro | Equity securities    
Assets    
Total nuclear decommissioning trust 243.1 211.1
Total self-insured health plan trust 1.7 0.5
Evergy Metro | Cash equivalents    
Assets    
Total nuclear decommissioning trust 3.2 3.1
Evergy Metro | U.S. Treasury    
Assets    
Total nuclear decommissioning trust 47.7 50.3
Evergy Metro | U.S. Agency    
Assets    
Total nuclear decommissioning trust 0.5 0.4
Evergy Metro | State and local obligations    
Assets    
Total nuclear decommissioning trust 4.1 2.2
Evergy Metro | Corporate bonds    
Assets    
Total nuclear decommissioning trust 43.1 33.2
Evergy Metro | Foreign governments    
Assets    
Total nuclear decommissioning trust 0.1 0.1
Evergy Metro | Other    
Assets    
Total nuclear decommissioning trust 0.5 0.3
Evergy Metro | Debt securities    
Assets    
Total self-insured health plan trust 8.0 6.7
Evergy Metro | Cash and cash equivalents    
Assets    
Total self-insured health plan trust 3.5 2.7
Evergy Metro | Level 1    
Assets    
Total nuclear decommissioning trust 294.5 264.5
Total self-insured health plan trust 8.0 4.6
Total Assets 302.5 269.1
Evergy Metro | Level 1 | Equity securities    
Assets    
Total nuclear decommissioning trust 243.1 211.1
Total self-insured health plan trust 1.7 0.5
Evergy Metro | Level 1 | Cash equivalents    
Assets    
Total nuclear decommissioning trust 3.2 3.1
Evergy Metro | Level 1 | U.S. Treasury    
Assets    
Total nuclear decommissioning trust 47.7 50.3
Evergy Metro | Level 1 | U.S. Agency    
Assets    
Total nuclear decommissioning trust 0.0 0.0
Evergy Metro | Level 1 | State and local obligations    
Assets    
Total nuclear decommissioning trust 0.0 0.0
Evergy Metro | Level 1 | Corporate bonds    
Assets    
Total nuclear decommissioning trust 0.0 0.0
Evergy Metro | Level 1 | Foreign governments    
Assets    
Total nuclear decommissioning trust 0.0 0.0
Evergy Metro | Level 1 | Other    
Assets    
Total nuclear decommissioning trust 0.5 0.0
Evergy Metro | Level 1 | Debt securities    
Assets    
Total self-insured health plan trust 2.8 1.4
Evergy Metro | Level 1 | Cash and cash equivalents    
Assets    
Total self-insured health plan trust 3.5 2.7
Evergy Metro | Level 2    
Assets    
Total nuclear decommissioning trust 47.8 36.2
Total self-insured health plan trust 5.2 5.3
Total Assets 53.0 41.5
Evergy Metro | Level 2 | Equity securities    
Assets    
Total nuclear decommissioning trust 0.0 0.0
Total self-insured health plan trust 0.0 0.0
Evergy Metro | Level 2 | Cash equivalents    
Assets    
Total nuclear decommissioning trust 0.0 0.0
Evergy Metro | Level 2 | U.S. Treasury    
Assets    
Total nuclear decommissioning trust 0.0 0.0
Evergy Metro | Level 2 | U.S. Agency    
Assets    
Total nuclear decommissioning trust 0.5 0.4
Evergy Metro | Level 2 | State and local obligations    
Assets    
Total nuclear decommissioning trust 4.1 2.2
Evergy Metro | Level 2 | Corporate bonds    
Assets    
Total nuclear decommissioning trust 43.1 33.2
Evergy Metro | Level 2 | Foreign governments    
Assets    
Total nuclear decommissioning trust 0.1 0.1
Evergy Metro | Level 2 | Other    
Assets    
Total nuclear decommissioning trust 0.0 0.3
Evergy Metro | Level 2 | Debt securities    
Assets    
Total self-insured health plan trust 5.2 5.3
Evergy Metro | Level 2 | Cash and cash equivalents    
Assets    
Total self-insured health plan trust 0.0 0.0
Evergy Metro | Level 3    
Assets    
Total nuclear decommissioning trust 0.0 0.0
Total self-insured health plan trust 0.0 0.0
Total Assets 0.0 0.0
Evergy Metro | Level 3 | Equity securities    
Assets    
Total nuclear decommissioning trust 0.0 0.0
Total self-insured health plan trust 0.0 0.0
Evergy Metro | Level 3 | Cash equivalents    
Assets    
Total nuclear decommissioning trust 0.0 0.0
Evergy Metro | Level 3 | U.S. Treasury    
Assets    
Total nuclear decommissioning trust 0.0 0.0
Evergy Metro | Level 3 | U.S. Agency    
Assets    
Total nuclear decommissioning trust 0.0 0.0
Evergy Metro | Level 3 | State and local obligations    
Assets    
Total nuclear decommissioning trust 0.0 0.0
Evergy Metro | Level 3 | Corporate bonds    
Assets    
Total nuclear decommissioning trust 0.0 0.0
Evergy Metro | Level 3 | Foreign governments    
Assets    
Total nuclear decommissioning trust 0.0 0.0
Evergy Metro | Level 3 | Other    
Assets    
Total nuclear decommissioning trust 0.0 0.0
Evergy Metro | Level 3 | Debt securities    
Assets    
Total self-insured health plan trust 0.0 0.0
Evergy Metro | Level 3 | Cash and cash equivalents    
Assets    
Total self-insured health plan trust 0.0 0.0
Evergy Metro | NAV    
Assets    
Total nuclear decommissioning trust 0.0 0.0
Total self-insured health plan trust 0.0 0.0
Total Assets 0.0 0.0
Evergy Metro | NAV | Equity securities    
Assets    
Total nuclear decommissioning trust 0.0 0.0
Total self-insured health plan trust 0.0 0.0
Evergy Metro | NAV | Cash equivalents    
Assets    
Total nuclear decommissioning trust 0.0 0.0
Evergy Metro | NAV | U.S. Treasury    
Assets    
Total nuclear decommissioning trust 0.0 0.0
Evergy Metro | NAV | U.S. Agency    
Assets    
Total nuclear decommissioning trust 0.0 0.0
Evergy Metro | NAV | State and local obligations    
Assets    
Total nuclear decommissioning trust 0.0 0.0
Evergy Metro | NAV | Corporate bonds    
Assets    
Total nuclear decommissioning trust 0.0 0.0
Evergy Metro | NAV | Foreign governments    
Assets    
Total nuclear decommissioning trust 0.0 0.0
Evergy Metro | NAV | Other    
Assets    
Total nuclear decommissioning trust 0.0 0.0
Evergy Metro | NAV | Debt securities    
Assets    
Total self-insured health plan trust 0.0 0.0
Evergy Metro | NAV | Cash and cash equivalents    
Assets    
Total self-insured health plan trust 0.0 0.0
Other Evergy    
Assets    
Total rabbi trust 13.6 13.8
Other Evergy | Fixed income fund    
Assets    
Total rabbi trust 13.1 13.3
Other Evergy | Cash and cash equivalents    
Assets    
Total rabbi trust 0.5 0.5
Other Evergy | Level 1    
Assets    
Total rabbi trust 0.5 0.5
Other Evergy | Level 1 | Fixed income fund    
Assets    
Total rabbi trust 0.0 0.0
Other Evergy | Level 1 | Cash and cash equivalents    
Assets    
Total rabbi trust 0.5 0.5
Other Evergy | Level 2    
Assets    
Total rabbi trust 0.0 0.0
Other Evergy | Level 2 | Fixed income fund    
Assets    
Total rabbi trust 0.0 0.0
Other Evergy | Level 2 | Cash and cash equivalents    
Assets    
Total rabbi trust 0.0 0.0
Other Evergy | Level 3    
Assets    
Total rabbi trust 0.0 0.0
Other Evergy | Level 3 | Fixed income fund    
Assets    
Total rabbi trust 0.0 0.0
Other Evergy | Level 3 | Cash and cash equivalents    
Assets    
Total rabbi trust 0.0 0.0
Other Evergy | NAV    
Assets    
Total rabbi trust 13.1 13.3
Other Evergy | NAV | Fixed income fund    
Assets    
Total rabbi trust 13.1 13.3
Other Evergy | NAV | Cash and cash equivalents    
Assets    
Total rabbi trust $ 0.0 $ 0.0