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v3.19.1

REVENUE (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Disaggregation of Revenue [Line Items] |  |
Total revenue from contracts with customers | $ 1,185.1 | $ 601.3
Other | 31.8 | (1.1)
Revenues | 1,216.9 | 600.2
Westar Energy |  |
Disaggregation of Revenue [Line Items] |  |
Total revenue from contracts with customers | 592.3 | 601.3
Other | 4.5 | (1.1)
Revenues | 596.8 | 600.2
KCP&L |  |
Disaggregation of Revenue [Line Items] |  |
Total revenue from contracts with customers | 402.9 | 378.0
Other | 22.5 | 19.1
Revenues | 425.4 | 397.1
Residential |  |
Disaggregation of Revenue [Line Items] |  |
Total revenue from contracts with customers | 451.7 | 180.3
Residential | Westar Energy |  |
Disaggregation of Revenue [Line Items] |  |
Total revenue from contracts with customers | 192.3 | 180.3
Residential | KCP&L |  |
Disaggregation of Revenue [Line Items] |  |
Total revenue from contracts with customers | 164.2 | 154.9
Commercial |  |
Disaggregation of Revenue [Line Items] |  |
Total revenue from contracts with customers | 413.5 | 155.4
Commercial | Westar Energy |  |
Disaggregation of Revenue [Line Items] |  |
Total revenue from contracts with customers | 164.3 | 155.4
Commercial | KCP&L |  |
Disaggregation of Revenue [Line Items] |  |
Total revenue from contracts with customers | 183.8 | 181.8
Industrial |  |
Disaggregation of Revenue [Line Items] |  |
Total revenue from contracts with customers | 147.0 | 93.5
Industrial | Westar Energy |  |
Disaggregation of Revenue [Line Items] |  |
Total revenue from contracts with customers | 98.4 | 93.5
Industrial | KCP&L |  |
Disaggregation of Revenue [Line Items] |  |
Total revenue from contracts with customers | 29.7 | 32.2
Other retail |  |
Disaggregation of Revenue [Line Items] |  |
Total revenue from contracts with customers | 9.8 | 4.2
Other retail | Westar Energy |  |
Disaggregation of Revenue [Line Items] |  |
Total revenue from contracts with customers | 5.1 | 4.2
Other retail | KCP&L |  |
Disaggregation of Revenue [Line Items] |  |
Total revenue from contracts with customers | 2.6 | 2.7
Total electric retail |  |
Disaggregation of Revenue [Line Items] |  |
Total revenue from contracts with customers | 1,022.0 | 433.4
Total electric retail | Westar Energy |  |
Disaggregation of Revenue [Line Items] |  |
Total revenue from contracts with customers | 460.1 | 433.4
Total electric retail | KCP&L |  |
Disaggregation of Revenue [Line Items] |  |
Total revenue from contracts with customers | 380.3 | 371.6
Wholesale |  |
Disaggregation of Revenue [Line Items] |  |
Total revenue from contracts with customers | 83.1 | 94.2
Wholesale | Westar Energy |  |
Disaggregation of Revenue [Line Items] |  |
Total revenue from contracts with customers | 61.3 | 94.2
Wholesale | KCP&L |  |
Disaggregation of Revenue [Line Items] |  |
Total revenue from contracts with customers | 18.1 | 3.1
Transmission |  |
Disaggregation of Revenue [Line Items] |  |
Total revenue from contracts with customers | 76.7 | 71.9
Transmission | Westar Energy |  |
Disaggregation of Revenue [Line Items] |  |
Total revenue from contracts with customers | 69.2 | 71.9
Transmission | KCP&L |  |
Disaggregation of Revenue [Line Items] |  |
Total revenue from contracts with customers | 3.1 | 3.3
Industrial steam and other |  |
Disaggregation of Revenue [Line Items] |  |
Total revenue from contracts with customers | 3.3 | 1.8
Industrial steam and other | Westar Energy |  |
Disaggregation of Revenue [Line Items] |  |
Total revenue from contracts with customers | 1.7 | 1.8
Industrial steam and other | KCP&L |  |
Disaggregation of Revenue [Line Items] |  |
Total revenue from contracts with customers | $ 1.4 | $ 0.0

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