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ORGANIZATION AND BASIS OF PRESENTATION - Other Income And Expense (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018
Entity Information [Line Items] |  |
Non-service cost component of net benefit cost | $ (13.1) | $ (5.7)
Other | (6.3) | (4.9)
Other expense | (19.4) | (10.6)
Westar Energy |  |
Entity Information [Line Items] |  |
Non-service cost component of net benefit cost | (4.4) | (5.7)
Other | (6.2) | (4.9)
Other expense | (10.6) | (10.6)
KCP&L |  |
Entity Information [Line Items] |  |
Non-service cost component of net benefit cost | (5.1) | (6.7)
Other | 0.1 | (1.2)
Other expense | $ (5.0) | $ (7.9)

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