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 | 493 |
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 |
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 |
Total rabbi trust | 0 | 0 |
Total self-insured health plan trust | 0 | 0 |
Total Assets | 0 | 0 |
NAV | | |
Assets | | |
Total nuclear decommissioning trust | 45.3 | 44 |
Total rabbi trust | 42.5 | 44.9 |
Total self-insured health plan trust | 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 | 228.6 |
Evergy Kansas Central | Level 1 | Core bond fund | | |
Assets | | |
Total nuclear decommissioning trust | 37.9 | 39.3 |
Total rabbi trust | 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 |
Evergy Kansas Central | Level 1 | Alternative investments fund | | |
Assets | | |
Total nuclear decommissioning trust | 0 | 0 |
Evergy Kansas Central | Level 1 | Real estate securities fund | | |
Assets | | |
Total nuclear decommissioning trust | 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 |
Total rabbi trust | 0 | 0 |
Total Assets | 0 | 0 |
Evergy Kansas Central | Level 2 | Core bond fund | | |
Assets | | |
Total nuclear decommissioning trust | 0 | 0 |
Total rabbi trust | 0 | 0 |
Evergy Kansas Central | Level 2 | High-yield bond fund | | |
Assets | | |
Total nuclear decommissioning trust | 0 | 0 |
Evergy Kansas Central | Level 2 | Emerging markets bond fund | | |
Assets | | |
Total nuclear decommissioning trust | 0 | 0 |
Evergy Kansas Central | Level 2 | Combination debt/equity/other fund | | |
Assets | | |
Total nuclear decommissioning trust | 0 | 0 |
Total rabbi trust | 0 | 0 |
Evergy Kansas Central | Level 2 | Alternative investments fund | | |
Assets | | |
Total nuclear decommissioning trust | 0 | 0 |
Evergy Kansas Central | Level 2 | Real estate securities fund | | |
Assets | | |
Total nuclear decommissioning trust | 0 | 0 |
Evergy Kansas Central | Level 2 | Cash equivalents | | |
Assets | | |
Total nuclear decommissioning trust | 0 | 0 |
Total rabbi trust | 0 | 0 |
Evergy Kansas Central | Level 3 | | |
Assets | | |
Total nuclear decommissioning trust | 0 | 0 |
Total rabbi trust | 0 | 0 |
Total Assets | 0 | 0 |
Evergy Kansas Central | Level 3 | Core bond fund | | |
Assets | | |
Total nuclear decommissioning trust | 0 | 0 |
Total rabbi trust | 0 | 0 |
Evergy Kansas Central | Level 3 | High-yield bond fund | | |
Assets | | |
Total nuclear decommissioning trust | 0 | 0 |
Evergy Kansas Central | Level 3 | Emerging markets bond fund | | |
Assets | | |
Total nuclear decommissioning trust | 0 | 0 |
Evergy Kansas Central | Level 3 | Combination debt/equity/other fund | | |
Assets | | |
Total nuclear decommissioning trust | 0 | 0 |
Total rabbi trust | 0 | 0 |
Evergy Kansas Central | Level 3 | Alternative investments fund | | |
Assets | | |
Total nuclear decommissioning trust | 0 | 0 |
Evergy Kansas Central | Level 3 | Real estate securities fund | | |
Assets | | |
Total nuclear decommissioning trust | 0 | 0 |
Evergy Kansas Central | Level 3 | Cash equivalents | | |
Assets | | |
Total nuclear decommissioning trust | 0 | 0 |
Total rabbi trust | 0 | 0 |
Evergy Kansas Central | NAV | | |
Assets | | |
Total nuclear decommissioning trust | 45.3 | 44 |
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 |
Total rabbi trust | 23.4 | 25.3 |
Evergy Kansas Central | NAV | High-yield bond fund | | |
Assets | | |
Total nuclear decommissioning trust | 0 | 0 |
Evergy Kansas Central | NAV | Emerging markets bond fund | | |
Assets | | |
Total nuclear decommissioning trust | 0 | 0 |
Evergy Kansas Central | NAV | Combination debt/equity/other fund | | |
Assets | | |
Total nuclear decommissioning trust | 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 |
Total rabbi trust | 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 |
Evergy Kansas Central | Domestic | Level 3 | Equity securities | | |
Assets | | |
Total nuclear decommissioning trust | 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 |
Evergy Kansas Central | International | Level 1 | Equity securities | | |
Assets | | |
Total nuclear decommissioning trust | 41.9 | 52 |
Evergy Kansas Central | International | Level 2 | Equity securities | | |
Assets | | |
Total nuclear decommissioning trust | 0 | 0 |
Evergy Kansas Central | International | Level 3 | Equity securities | | |
Assets | | |
Total nuclear decommissioning trust | 0 | 0 |
Evergy Kansas Central | International | NAV | Equity securities | | |
Assets | | |
Total nuclear decommissioning trust | 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 | 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 |
Evergy Metro | Level 1 | State and local obligations | | |
Assets | | |
Total nuclear decommissioning trust | 0 | 0 |
Evergy Metro | Level 1 | Corporate bonds | | |
Assets | | |
Total nuclear decommissioning trust | 0 | 0 |
Evergy Metro | Level 1 | Foreign governments | | |
Assets | | |
Total nuclear decommissioning trust | 0 | 0 |
Evergy Metro | Level 1 | Other | | |
Assets | | |
Total nuclear decommissioning trust | 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 | 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 |
Total self-insured health plan trust | 0 | 0 |
Evergy Metro | Level 2 | Cash equivalents | | |
Assets | | |
Total nuclear decommissioning trust | 0 | 0 |
Evergy Metro | Level 2 | U.S. Treasury | | |
Assets | | |
Total nuclear decommissioning trust | 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 |
Evergy Metro | Level 3 | | |
Assets | | |
Total nuclear decommissioning trust | 0 | 0 |
Total self-insured health plan trust | 0 | 0 |
Total Assets | 0 | 0 |
Evergy Metro | Level 3 | Equity securities | | |
Assets | | |
Total nuclear decommissioning trust | 0 | 0 |
Total self-insured health plan trust | 0 | 0 |
Evergy Metro | Level 3 | Cash equivalents | | |
Assets | | |
Total nuclear decommissioning trust | 0 | 0 |
Evergy Metro | Level 3 | U.S. Treasury | | |
Assets | | |
Total nuclear decommissioning trust | 0 | 0 |
Evergy Metro | Level 3 | U.S. Agency | | |
Assets | | |
Total nuclear decommissioning trust | 0 | 0 |
Evergy Metro | Level 3 | State and local obligations | | |
Assets | | |
Total nuclear decommissioning trust | 0 | 0 |
Evergy Metro | Level 3 | Corporate bonds | | |
Assets | | |
Total nuclear decommissioning trust | 0 | 0 |
Evergy Metro | Level 3 | Foreign governments | | |
Assets | | |
Total nuclear decommissioning trust | 0 | 0 |
Evergy Metro | Level 3 | Other | | |
Assets | | |
Total nuclear decommissioning trust | 0 | 0 |
Evergy Metro | Level 3 | Debt securities | | |
Assets | | |
Total self-insured health plan trust | 0 | 0 |
Evergy Metro | Level 3 | Cash and cash equivalents | | |
Assets | | |
Total self-insured health plan trust | 0 | 0 |
Evergy Metro | NAV | | |
Assets | | |
Total nuclear decommissioning trust | 0 | 0 |
Total self-insured health plan trust | 0 | 0 |
Total Assets | 0 | 0 |
Evergy Metro | NAV | Equity securities | | |
Assets | | |
Total nuclear decommissioning trust | 0 | 0 |
Total self-insured health plan trust | 0 | 0 |
Evergy Metro | NAV | Cash equivalents | | |
Assets | | |
Total nuclear decommissioning trust | 0 | 0 |
Evergy Metro | NAV | U.S. Treasury | | |
Assets | | |
Total nuclear decommissioning trust | 0 | 0 |
Evergy Metro | NAV | U.S. Agency | | |
Assets | | |
Total nuclear decommissioning trust | 0 | 0 |
Evergy Metro | NAV | State and local obligations | | |
Assets | | |
Total nuclear decommissioning trust | 0 | 0 |
Evergy Metro | NAV | Corporate bonds | | |
Assets | | |
Total nuclear decommissioning trust | 0 | 0 |
Evergy Metro | NAV | Foreign governments | | |
Assets | | |
Total nuclear decommissioning trust | 0 | 0 |
Evergy Metro | NAV | Other | | |
Assets | | |
Total nuclear decommissioning trust | 0 | 0 |
Evergy Metro | NAV | Debt securities | | |
Assets | | |
Total self-insured health plan trust | 0 | 0 |
Evergy Metro | NAV | Cash and cash equivalents | | |
Assets | | |
Total self-insured health plan trust | 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 |
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 |
Other Evergy | Level 2 | Fixed income fund | | |
Assets | | |
Total rabbi trust | 0 | 0 |
Other Evergy | Level 2 | Cash and cash equivalents | | |
Assets | | |
Total rabbi trust | 0 | 0 |
Other Evergy | Level 3 | | |
Assets | | |
Total rabbi trust | 0 | 0 |
Other Evergy | Level 3 | Fixed income fund | | |
Assets | | |
Total rabbi trust | 0 | 0 |
Other Evergy | Level 3 | Cash and cash equivalents | | |
Assets | | |
Total rabbi trust | 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 |