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FAIR VALUE MEASUREMENTS - Recurring (Details) - Fair Value, Measurements, Recurring - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2019
Assets    
Total nuclear decommissioning trust $ 497.4 $ 573.2
Total rabbi trust 43.1 45.5
Total self-insured health plan trust 11.9 9.9
Total Assets 552.4 628.6
Level 1    
Assets    
Total nuclear decommissioning trust 413.0 493.0
Total rabbi trust 0.6 0.6
Total self-insured health plan trust 6.8 4.6
Total Assets 420.4 498.2
Level 2    
Assets    
Total nuclear decommissioning trust 39.1 36.2
Total rabbi trust 0.0 0.0
Total self-insured health plan trust 5.1 5.3
Total Assets 44.2 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 45.3 44.0
Total rabbi trust 42.5 44.9
Total self-insured health plan trust 0.0 0.0
Total Assets 87.8 88.9
Evergy Kansas Central    
Assets    
Total nuclear decommissioning trust 240.2 272.5
Total rabbi trust 29.4 31.7
Total Assets 269.6 304.2
Evergy Kansas Central | Core bond fund    
Assets    
Total nuclear decommissioning trust 37.9 39.3
Total rabbi trust 23.4 25.3
Evergy Kansas Central | High-yield bond fund    
Assets    
Total nuclear decommissioning trust 18.8 22.3
Evergy Kansas Central | Emerging markets bond fund    
Assets    
Total nuclear decommissioning trust 16.3 19.4
Evergy Kansas Central | Combination debt/equity/other fund    
Assets    
Total nuclear decommissioning trust 13.9 16.4
Total rabbi trust 5.9 6.3
Evergy Kansas Central | Alternative investments fund    
Assets    
Total nuclear decommissioning trust 25.3 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 2.6 0.5
Total rabbi trust 0.1 0.1
Evergy Kansas Central | Level 1    
Assets    
Total nuclear decommissioning trust 194.9 228.5
Total rabbi trust 0.1 0.1
Total Assets 195.0 228.6
Evergy Kansas Central | Level 1 | Core bond fund    
Assets    
Total nuclear decommissioning trust 37.9 39.3
Total rabbi trust 0.0 0.0
Evergy Kansas Central | Level 1 | High-yield bond fund    
Assets    
Total nuclear decommissioning trust 18.8 22.3
Evergy Kansas Central | Level 1 | Emerging markets bond fund    
Assets    
Total nuclear decommissioning trust 16.3 19.4
Evergy Kansas Central | Level 1 | Combination debt/equity/other fund    
Assets    
Total nuclear decommissioning trust 13.9 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 2.6 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 45.3 44.0
Total rabbi trust 29.3 31.6
Total Assets 74.6 75.6
Evergy Kansas Central | NAV | Core bond fund    
Assets    
Total nuclear decommissioning trust 0.0 0.0
Total rabbi trust 23.4 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 5.9 6.3
Evergy Kansas Central | NAV | Alternative investments fund    
Assets    
Total nuclear decommissioning trust 25.3 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 70.7 86.1
Evergy Kansas Central | Domestic | Level 1 | Equity securities    
Assets    
Total nuclear decommissioning trust 63.5 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 7.2 7.5
Evergy Kansas Central | International | Equity securities    
Assets    
Total nuclear decommissioning trust 41.9 52.0
Evergy Kansas Central | International | Level 1 | Equity securities    
Assets    
Total nuclear decommissioning trust 41.9 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 257.2 300.7
Total self-insured health plan trust 11.9 9.9
Total Assets 269.1 310.6
Evergy Metro | Equity securities    
Assets    
Total nuclear decommissioning trust 161.2 211.1
Total self-insured health plan trust 0.4 0.5
Evergy Metro | Cash equivalents    
Assets    
Total nuclear decommissioning trust 3.7 3.1
Evergy Metro | U.S. Treasury    
Assets    
Total nuclear decommissioning trust 53.2 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 2.1 2.2
Evergy Metro | Corporate bonds    
Assets    
Total nuclear decommissioning trust 35.7 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 6.5 6.7
Evergy Metro | Cash and cash equivalents    
Assets    
Total self-insured health plan trust 5.0 2.7
Evergy Metro | Level 1    
Assets    
Total nuclear decommissioning trust 218.1 264.5
Total self-insured health plan trust 6.8 4.6
Total Assets 224.9 269.1
Evergy Metro | Level 1 | Equity securities    
Assets    
Total nuclear decommissioning trust 161.2 211.1
Total self-insured health plan trust 0.4 0.5
Evergy Metro | Level 1 | Cash equivalents    
Assets    
Total nuclear decommissioning trust 3.7 3.1
Evergy Metro | Level 1 | U.S. Treasury    
Assets    
Total nuclear decommissioning trust 53.2 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 1.4 1.4
Evergy Metro | Level 1 | Cash and cash equivalents    
Assets    
Total self-insured health plan trust 5.0 2.7
Evergy Metro | Level 2    
Assets    
Total nuclear decommissioning trust 39.1 36.2
Total self-insured health plan trust 5.1 5.3
Total Assets 44.2 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 2.1 2.2
Evergy Metro | Level 2 | Corporate bonds    
Assets    
Total nuclear decommissioning trust 35.7 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 5.1 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 13.2 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 13.2 13.3
Other Evergy | NAV | Fixed income fund    
Assets    
Total rabbi trust 13.2 13.3
Other Evergy | NAV | Cash and cash equivalents    
Assets    
Total rabbi trust $ 0.0 $ 0.0