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FAIR VALUE MEASUREMENTS - Recurring (Details) - Fair Value, Measurements, Recurring - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Assets    
Total nuclear decommissioning trust $ 587.5 $ 573.2
Total rabbi trust 45.5 45.5
Total self-insured health plan trust 13.0 9.9
Total Assets 646.0 628.6
Level 1    
Assets    
Total nuclear decommissioning trust 501.9 493.0
Total rabbi trust 0.8 0.6
Total self-insured health plan trust 7.6 4.6
Total Assets 510.3 498.2
Level 2    
Assets    
Total nuclear decommissioning trust 45.2 36.2
Total rabbi trust 0.0 0.0
Total self-insured health plan trust 5.4 5.3
Total Assets 50.6 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 40.4 44.0
Total rabbi trust 44.7 44.9
Total self-insured health plan trust 0.0 0.0
Total Assets 85.1 88.9
Evergy Kansas Central    
Assets    
Total nuclear decommissioning trust 279.1 272.5
Total rabbi trust 31.8 31.7
Total Assets 310.9 304.2
Evergy Kansas Central | Core bond fund    
Assets    
Total nuclear decommissioning trust 39.6 39.3
Total rabbi trust 25.3 25.3
Evergy Kansas Central | High-yield bond fund    
Assets    
Total nuclear decommissioning trust 23.0 22.3
Evergy Kansas Central | Emerging markets bond fund    
Assets    
Total nuclear decommissioning trust 18.8 19.4
Evergy Kansas Central | Combination debt/equity/other fund    
Assets    
Total nuclear decommissioning trust 18.2 16.4
Total rabbi trust 6.3 6.3
Evergy Kansas Central | Alternative investments fund    
Assets    
Total nuclear decommissioning trust 20.2 23.9
Evergy Kansas Central | Real estate securities fund    
Assets    
Total nuclear decommissioning trust 12.8 12.6
Evergy Kansas Central | Cash equivalents    
Assets    
Total nuclear decommissioning trust 0.4 0.5
Total rabbi trust 0.2 0.1
Evergy Kansas Central | Level 1    
Assets    
Total nuclear decommissioning trust 238.7 228.5
Total rabbi trust 0.2 0.1
Total Assets 238.9 228.6
Evergy Kansas Central | Level 1 | Core bond fund    
Assets    
Total nuclear decommissioning trust 39.6 39.3
Total rabbi trust 0.0 0.0
Evergy Kansas Central | Level 1 | High-yield bond fund    
Assets    
Total nuclear decommissioning trust 23.0 22.3
Evergy Kansas Central | Level 1 | Emerging markets bond fund    
Assets    
Total nuclear decommissioning trust 18.8 19.4
Evergy Kansas Central | Level 1 | Combination debt/equity/other fund    
Assets    
Total nuclear decommissioning trust 18.2 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 0.4 0.5
Total rabbi trust 0.2 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 40.4 44.0
Total rabbi trust 31.6 31.6
Total Assets 72.0 75.6
Evergy Kansas Central | NAV | Core bond fund    
Assets    
Total nuclear decommissioning trust 0.0 0.0
Total rabbi trust 25.3 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 6.3 6.3
Evergy Kansas Central | NAV | Alternative investments fund    
Assets    
Total nuclear decommissioning trust 20.2 23.9
Evergy Kansas Central | NAV | Real estate securities fund    
Assets    
Total nuclear decommissioning trust 12.8 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 90.9 86.1
Evergy Kansas Central | Domestic | Level 1 | Equity securities    
Assets    
Total nuclear decommissioning trust 83.5 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 7.4 7.5
Evergy Kansas Central | International | Equity securities    
Assets    
Total nuclear decommissioning trust 55.2 52.0
Evergy Kansas Central | International | Level 1 | Equity securities    
Assets    
Total nuclear decommissioning trust 55.2 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 308.4 300.7
Total self-insured health plan trust 13.0 9.9
Total Assets 321.4 310.6
Evergy Metro | Equity securities    
Assets    
Total nuclear decommissioning trust 208.0 211.1
Total self-insured health plan trust 1.1 0.5
Evergy Metro | Cash equivalents    
Assets    
Total nuclear decommissioning trust 7.1 3.1
Evergy Metro | U.S. Treasury    
Assets    
Total nuclear decommissioning trust 48.1 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 3.7 2.2
Evergy Metro | Corporate bonds    
Assets    
Total nuclear decommissioning trust 40.9 33.2
Evergy Metro | Foreign governments    
Assets    
Total nuclear decommissioning trust 0.1 0.1
Evergy Metro | Other    
Assets    
Total nuclear decommissioning trust 0.0 0.3
Evergy Metro | Debt securities    
Assets    
Total self-insured health plan trust 8.6 6.7
Evergy Metro | Cash and cash equivalents    
Assets    
Total self-insured health plan trust 3.3 2.7
Evergy Metro | Level 1    
Assets    
Total nuclear decommissioning trust 263.2 264.5
Total self-insured health plan trust 7.6 4.6
Total Assets 270.8 269.1
Evergy Metro | Level 1 | Equity securities    
Assets    
Total nuclear decommissioning trust 208.0 211.1
Total self-insured health plan trust 1.1 0.5
Evergy Metro | Level 1 | Cash equivalents    
Assets    
Total nuclear decommissioning trust 7.1 3.1
Evergy Metro | Level 1 | U.S. Treasury    
Assets    
Total nuclear decommissioning trust 48.1 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 3.3 2.7
Evergy Metro | Level 2    
Assets    
Total nuclear decommissioning trust 45.2 36.2
Total self-insured health plan trust 5.4 5.3
Total Assets 50.6 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 3.7 2.2
Evergy Metro | Level 2 | Corporate bonds    
Assets    
Total nuclear decommissioning trust 40.9 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 5.4 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 13.7 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 0.6 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 13.1 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