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FAIR VALUE MEASUREMENTS - Recurring (Details) - Fair Value, Measurements, Recurring - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
Assets    
Total nuclear decommissioning trust $ 557.4 $ 573.2
Total rabbi trust 45.1 45.5
Total self-insured health plan trust 10.8 9.9
Total Assets 613.3 628.6
Level 1    
Assets    
Total nuclear decommissioning trust 474.5 493.0
Total rabbi trust 0.7 0.6
Total self-insured health plan trust 5.2 4.6
Total Assets 480.4 498.2
Level 2    
Assets    
Total nuclear decommissioning trust 45.1 36.2
Total rabbi trust 0.0 0.0
Total self-insured health plan trust 5.6 5.3
Total Assets 50.7 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 37.8 44.0
Total rabbi trust 44.4 44.9
Total self-insured health plan trust 0.0 0.0
Total Assets 82.2 88.9
Evergy Kansas Central    
Assets    
Total nuclear decommissioning trust 263.2 272.5
Total rabbi trust 31.5 31.7
Total Assets 294.7 304.2
Evergy Kansas Central | Core bond fund    
Assets    
Total nuclear decommissioning trust 39.7 39.3
Total rabbi trust 25.0 25.3
Evergy Kansas Central | High-yield bond fund    
Assets    
Total nuclear decommissioning trust 20.6 22.3
Evergy Kansas Central | Emerging markets bond fund    
Assets    
Total nuclear decommissioning trust 18.5 19.4
Evergy Kansas Central | Combination debt/equity/other fund    
Assets    
Total nuclear decommissioning trust 16.9 16.4
Total rabbi trust 6.4 6.3
Evergy Kansas Central | Alternative investments fund    
Assets    
Total nuclear decommissioning trust 17.4 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 0.8 0.5
Total rabbi trust 0.1 0.1
Evergy Kansas Central | Level 1    
Assets    
Total nuclear decommissioning trust 225.4 228.5
Total rabbi trust 0.1 0.1
Total Assets 225.5 228.6
Evergy Kansas Central | Level 1 | Core bond fund    
Assets    
Total nuclear decommissioning trust 39.7 39.3
Total rabbi trust 0.0 0.0
Evergy Kansas Central | Level 1 | High-yield bond fund    
Assets    
Total nuclear decommissioning trust 20.6 22.3
Evergy Kansas Central | Level 1 | Emerging markets bond fund    
Assets    
Total nuclear decommissioning trust 18.5 19.4
Evergy Kansas Central | Level 1 | Combination debt/equity/other fund    
Assets    
Total nuclear decommissioning trust 16.9 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 0.8 0.5
Total rabbi trust 0.1 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 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 0.0
Evergy Kansas Central | NAV    
Assets    
Total nuclear decommissioning trust 37.8 44.0
Total rabbi trust 31.4 31.6
Total Assets 69.2 75.6
Evergy Kansas Central | NAV | Core bond fund    
Assets    
Total nuclear decommissioning trust 0.0 0.0
Total rabbi trust 25.0 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 6.4 6.3
Evergy Kansas Central | NAV | Alternative investments fund    
Assets    
Total nuclear decommissioning trust 17.4 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 0.0
Evergy Kansas Central | Domestic | Equity securities    
Assets    
Total nuclear decommissioning trust 85.2 86.1
Evergy Kansas Central | Domestic | Level 1 | Equity securities    
Assets    
Total nuclear decommissioning trust 77.7 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 7.5 7.5
Evergy Kansas Central | International | Equity securities    
Assets    
Total nuclear decommissioning trust 51.2 52.0
Evergy Kansas Central | International | Level 1 | Equity securities    
Assets    
Total nuclear decommissioning trust 51.2 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 294.2 300.7
Total self-insured health plan trust 10.8 9.9
Total Assets 305.0 310.6
Evergy Metro | Equity securities    
Assets    
Total nuclear decommissioning trust 196.5 211.1
Total self-insured health plan trust 0.5 0.5
Evergy Metro | Cash equivalents    
Assets    
Total nuclear decommissioning trust 1.8 3.1
Evergy Metro | U.S. Treasury    
Assets    
Total nuclear decommissioning trust 50.8 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 3.1 2.2
Evergy Metro | Corporate bonds    
Assets    
Total nuclear decommissioning trust 40.7 33.2
Evergy Metro | Foreign governments    
Assets    
Total nuclear decommissioning trust 0.1 0.1
Evergy Metro | Other    
Assets    
Total nuclear decommissioning trust 0.7 0.3
Evergy Metro | Debt securities    
Assets    
Total self-insured health plan trust 8.8 6.7
Evergy Metro | Cash and cash equivalents    
Assets    
Total self-insured health plan trust 1.5 2.7
Evergy Metro | Level 1    
Assets    
Total nuclear decommissioning trust 249.1 264.5
Total self-insured health plan trust 5.2 4.6
Total Assets 254.3 269.1
Evergy Metro | Level 1 | Equity securities    
Assets    
Total nuclear decommissioning trust 196.5 211.1
Total self-insured health plan trust 0.5 0.5
Evergy Metro | Level 1 | Cash equivalents    
Assets    
Total nuclear decommissioning trust 1.8 3.1
Evergy Metro | Level 1 | U.S. Treasury    
Assets    
Total nuclear decommissioning trust 50.8 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 0.0 0.0
Evergy Metro | Level 1 | Debt securities    
Assets    
Total self-insured health plan trust 3.2 1.4
Evergy Metro | Level 1 | Cash and cash equivalents    
Assets    
Total self-insured health plan trust 1.5 2.7
Evergy Metro | Level 2    
Assets    
Total nuclear decommissioning trust 45.1 36.2
Total self-insured health plan trust 5.6 5.3
Total Assets 50.7 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 3.1 2.2
Evergy Metro | Level 2 | Corporate bonds    
Assets    
Total nuclear decommissioning trust 40.7 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 0.7 0.3
Evergy Metro | Level 2 | Debt securities    
Assets    
Total self-insured health plan trust 5.6 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 13.0 13.3
Other Evergy | Cash and cash equivalents    
Assets    
Total rabbi trust 0.6 0.5
Other Evergy | Level 1    
Assets    
Total rabbi trust 0.6 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 0.6 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 13.0 13.3
Other Evergy | NAV | Fixed income fund    
Assets    
Total rabbi trust 13.0 13.3
Other Evergy | NAV | Cash and cash equivalents    
Assets    
Total rabbi trust $ 0.0 $ 0.0