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ORGANIZATION AND BASIS OF PRESENTATION - Restricted Cash (Details) - USD ($) $ in Millions | Mar. 31, 2019 | Dec. 31, 2018 | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |
Restricted cash | $ 414.3 | $ 0.0 | $ 0.1 | $ 0.1
KCP&L |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Restricted cash | 414.3 | $ 0.0 | $ 0.0 | $ 0.0
KCP&L | Senior Notes Due 2049 KCPL | Senior Notest |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt gross | $ 400.0 |  |  |
Interest rates (in hundredths) | 4.125% |  |  |
KCP&L | Senior Notes Due 2019 KCPL | Senior Notest |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rates (in hundredths) | 7.15% |  |  |

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