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ORGANIZATION AND BASIS OF PRESENTATION - Dividends Declared (Details) - USD ($) $ / shares in Units, $ in Millions |  | 3 Months Ended
--- | --- | ---
May 08, 2019 | Mar. 31, 2019 | Mar. 31, 2018
Dividends Payable [Line Items] |  |  |
Dividends declared on common stock (in dollars per share) |  | $ 0.475 | $ 0.4
Subsequent Event | KCP&L |  |  |
Dividends Payable [Line Items] |  |  |
Dividends payable | $ 65.0 |  |
Common stock | Subsequent Event |  |  |
Dividends Payable [Line Items] |  |  |
Dividends declared on common stock (in dollars per share) | $ 0.475 |  |

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