FAIR VALUE MEASUREMENTS - Recurring (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Millions | Jun. 30, 2022 | Dec. 31, 2021 |
Assets | | |
Total nuclear decommissioning trust | $ 687.6 | $ 768.7 |
Total rabbi trust | 37.2 | 44.2 |
Total self-insured health plan trust | 12.2 | 12.5 |
Equity securities | | 31.4 |
Total Assets | 737 | 856.8 |
Level 1 | | |
Assets | | |
Total nuclear decommissioning trust | 576.3 | 658.7 |
Total rabbi trust | 37.2 | 44.2 |
Total self-insured health plan trust | 6.8 | 6.5 |
Equity securities | | 0 |
Total Assets | 620.3 | 709.4 |
Level 2 | | |
Assets | | |
Total nuclear decommissioning trust | 45.9 | 48.2 |
Total rabbi trust | 0 | 0 |
Total self-insured health plan trust | 5.4 | 6 |
Equity securities | | 31.4 |
Total Assets | 51.3 | 85.6 |
Level 3 | | |
Assets | | |
Total nuclear decommissioning trust | 0 | 0 |
Total rabbi trust | 0 | 0 |
Total self-insured health plan trust | 0 | 0 |
Equity securities | | 0 |
Total Assets | 0 | 0 |
NAV | | |
Assets | | |
Total nuclear decommissioning trust | 65.4 | 61.8 |
Total rabbi trust | 0 | 0 |
Total self-insured health plan trust | 0 | 0 |
Equity securities | | 0 |
Total Assets | 65.4 | 61.8 |
Evergy Kansas Central | | |
Assets | | |
Total nuclear decommissioning trust | 334.5 | 368.4 |
Total rabbi trust | 26 | 31.7 |
Total Assets | 360.5 | 400.1 |
Evergy Kansas Central | Core bond fund | | |
Assets | | |
Total nuclear decommissioning trust | 53.9 | 58.1 |
Evergy Kansas Central | High-yield bond fund | | |
Assets | | |
Total nuclear decommissioning trust | 26.5 | 29.6 |
Evergy Kansas Central | Emerging markets bond fund | | |
Assets | | |
Total nuclear decommissioning trust | 16.3 | 18 |
Evergy Kansas Central | Combination debt/equity/other fund | | |
Assets | | |
Total rabbi trust | 2 | 2.4 |
Evergy Kansas Central | Alternative investments fund | | |
Assets | | |
Total nuclear decommissioning trust | 33.4 | 32.7 |
Evergy Kansas Central | Real estate securities fund | | |
Assets | | |
Total nuclear decommissioning trust | 17.7 | 15.2 |
Evergy Kansas Central | Cash equivalents | | |
Assets | | |
Total nuclear decommissioning trust | 0.5 | 0.4 |
Total rabbi trust | 0.2 | 0.2 |
Evergy Kansas Central | Equity funds | | |
Assets | | |
Total rabbi trust | 7.2 | 9.5 |
Evergy Kansas Central | Fixed income funds | | |
Assets | | |
Total rabbi trust | 16.6 | 19.6 |
Evergy Kansas Central | Level 1 | | |
Assets | | |
Total nuclear decommissioning trust | 269.1 | 306.6 |
Total rabbi trust | 26 | 31.7 |
Total Assets | 295.1 | 338.3 |
Evergy Kansas Central | Level 1 | Core bond fund | | |
Assets | | |
Total nuclear decommissioning trust | 53.9 | 58.1 |
Evergy Kansas Central | Level 1 | High-yield bond fund | | |
Assets | | |
Total nuclear decommissioning trust | 26.5 | 29.6 |
Evergy Kansas Central | Level 1 | Emerging markets bond fund | | |
Assets | | |
Total nuclear decommissioning trust | 16.3 | 18 |
Evergy Kansas Central | Level 1 | Combination debt/equity/other fund | | |
Assets | | |
Total rabbi trust | 2 | 2.4 |
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 | 0.5 | 0.4 |
Total rabbi trust | 0.2 | 0.2 |
Evergy Kansas Central | Level 1 | Equity funds | | |
Assets | | |
Total rabbi trust | 7.2 | 9.5 |
Evergy Kansas Central | Level 1 | Fixed income funds | | |
Assets | | |
Total rabbi trust | 16.6 | 19.6 |
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 |
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 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 2 | Equity funds | | |
Assets | | |
Total rabbi trust | 0 | 0 |
Evergy Kansas Central | Level 2 | Fixed income funds | | |
Assets | | |
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 |
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 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 | Level 3 | Equity funds | | |
Assets | | |
Total rabbi trust | 0 | 0 |
Evergy Kansas Central | Level 3 | Fixed income funds | | |
Assets | | |
Total rabbi trust | 0 | 0 |
Evergy Kansas Central | NAV | | |
Assets | | |
Total nuclear decommissioning trust | 65.4 | 61.8 |
Total rabbi trust | 0 | 0 |
Total Assets | 65.4 | 61.8 |
Evergy Kansas Central | NAV | Core bond fund | | |
Assets | | |
Total nuclear decommissioning trust | 0 | 0 |
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 rabbi trust | 0 | 0 |
Evergy Kansas Central | NAV | Alternative investments fund | | |
Assets | | |
Total nuclear decommissioning trust | 33.4 | 32.7 |
Evergy Kansas Central | NAV | Real estate securities fund | | |
Assets | | |
Total nuclear decommissioning trust | 17.7 | 15.2 |
Evergy Kansas Central | NAV | Cash equivalents | | |
Assets | | |
Total nuclear decommissioning trust | 0 | 0 |
Total rabbi trust | 0 | 0 |
Evergy Kansas Central | NAV | Equity funds | | |
Assets | | |
Total rabbi trust | 0 | 0 |
Evergy Kansas Central | NAV | Fixed income funds | | |
Assets | | |
Total rabbi trust | 0 | 0 |
Evergy Kansas Central | Domestic | Equity securities | | |
Assets | | |
Total nuclear decommissioning trust | 120.4 | 140.4 |
Evergy Kansas Central | Domestic | Level 1 | Equity securities | | |
Assets | | |
Total nuclear decommissioning trust | 106.1 | 126.5 |
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 | 14.3 | 13.9 |
Evergy Kansas Central | International | Equity securities | | |
Assets | | |
Total nuclear decommissioning trust | 65.8 | 74 |
Evergy Kansas Central | International | Level 1 | Equity securities | | |
Assets | | |
Total nuclear decommissioning trust | 65.8 | 74 |
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 | 353.1 | 400.3 |
Total self-insured health plan trust | 12.2 | 12.5 |
Total Assets | 365.3 | 412.8 |
Evergy Metro | Equity securities | | |
Assets | | |
Total nuclear decommissioning trust | 260.4 | 299.2 |
Total self-insured health plan trust | 1.6 | 2 |
Evergy Metro | Cash equivalents | | |
Assets | | |
Total nuclear decommissioning trust | 3 | 6.8 |
Evergy Metro | U.S. Treasury | | |
Assets | | |
Total nuclear decommissioning trust | 43.8 | 46.1 |
Evergy Metro | U.S. Agency | | |
Assets | | |
Total nuclear decommissioning trust | 0.4 | 0.4 |
Evergy Metro | State and local obligations | | |
Assets | | |
Total nuclear decommissioning trust | 5.2 | 4 |
Evergy Metro | Corporate bonds | | |
Assets | | |
Total nuclear decommissioning trust | 40.2 | 43.7 |
Evergy Metro | Foreign governments | | |
Assets | | |
Total nuclear decommissioning trust | 0.1 | 0.1 |
Evergy Metro | Debt securities | | |
Assets | | |
Total self-insured health plan trust | 7.7 | 8.7 |
Evergy Metro | Cash and cash equivalents | | |
Assets | | |
Total self-insured health plan trust | 2.9 | 1.8 |
Evergy Metro | Level 1 | | |
Assets | | |
Total nuclear decommissioning trust | 307.2 | 352.1 |
Total self-insured health plan trust | 6.8 | 6.5 |
Total Assets | 314 | 358.6 |
Evergy Metro | Level 1 | Equity securities | | |
Assets | | |
Total nuclear decommissioning trust | 260.4 | 299.2 |
Total self-insured health plan trust | 1.6 | 2 |
Evergy Metro | Level 1 | Cash equivalents | | |
Assets | | |
Total nuclear decommissioning trust | 3 | 6.8 |
Evergy Metro | Level 1 | U.S. Treasury | | |
Assets | | |
Total nuclear decommissioning trust | 43.8 | 46.1 |
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 | Debt securities | | |
Assets | | |
Total self-insured health plan trust | 2.3 | 2.7 |
Evergy Metro | Level 1 | Cash and cash equivalents | | |
Assets | | |
Total self-insured health plan trust | 2.9 | 1.8 |
Evergy Metro | Level 2 | | |
Assets | | |
Total nuclear decommissioning trust | 45.9 | 48.2 |
Total self-insured health plan trust | 5.4 | 6 |
Total Assets | 51.3 | 54.2 |
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 | 0.4 | 0.4 |
Evergy Metro | Level 2 | State and local obligations | | |
Assets | | |
Total nuclear decommissioning trust | 5.2 | 4 |
Evergy Metro | Level 2 | Corporate bonds | | |
Assets | | |
Total nuclear decommissioning trust | 40.2 | 43.7 |
Evergy Metro | Level 2 | Foreign governments | | |
Assets | | |
Total nuclear decommissioning trust | 0.1 | 0.1 |
Evergy Metro | Level 2 | Debt securities | | |
Assets | | |
Total self-insured health plan trust | 5.4 | 6 |
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 | 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 | 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 | | 12.5 |
Equity securities | | 31.4 |
Total Assets | 11.2 | 43.9 |
Other Evergy | Equity securities | | |
Assets | | |
Equity securities | | 31.4 |
Other Evergy | Core bond fund | | |
Assets | | |
Total rabbi trust | 11.1 | 12.5 |
Other Evergy | Cash and cash equivalents | | |
Assets | | |
Total rabbi trust | 0.1 | |
Other Evergy | Level 1 | | |
Assets | | |
Total rabbi trust | | 12.5 |
Equity securities | | 0 |
Total Assets | 11.2 | 12.5 |
Other Evergy | Level 1 | Equity securities | | |
Assets | | |
Equity securities | | 0 |
Other Evergy | Level 1 | Core bond fund | | |
Assets | | |
Total rabbi trust | 11.1 | 12.5 |
Other Evergy | Level 1 | Cash and cash equivalents | | |
Assets | | |
Total rabbi trust | 0.1 | |
Other Evergy | Level 2 | | |
Assets | | |
Total rabbi trust | | 0 |
Equity securities | | 31.4 |
Total Assets | 0 | 31.4 |
Other Evergy | Level 2 | Equity securities | | |
Assets | | |
Equity securities | | 31.4 |
Other Evergy | Level 2 | Core bond fund | | |
Assets | | |
Total rabbi trust | 0 | 0 |
Other Evergy | Level 2 | Cash and cash equivalents | | |
Assets | | |
Total rabbi trust | 0 | |
Other Evergy | Level 3 | | |
Assets | | |
Total rabbi trust | | 0 |
Equity securities | | 0 |
Total Assets | 0 | 0 |
Other Evergy | Level 3 | Equity securities | | |
Assets | | |
Equity securities | | 0 |
Other Evergy | Level 3 | Core bond fund | | |
Assets | | |
Total rabbi trust | 0 | 0 |
Other Evergy | Level 3 | Cash and cash equivalents | | |
Assets | | |
Total rabbi trust | 0 | |
Other Evergy | NAV | | |
Assets | | |
Total rabbi trust | | 0 |
Equity securities | | 0 |
Total Assets | 0 | 0 |
Other Evergy | NAV | Equity securities | | |
Assets | | |
Equity securities | | 0 |
Other Evergy | NAV | Core bond fund | | |
Assets | | |
Total rabbi trust | 0 | $ 0 |
Other Evergy | NAV | Cash and cash equivalents | | |
Assets | | |
Total rabbi trust | $ 0 | |