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RECEIVABLES - Narrative (Details) - USD ($) $ in Millions | Mar. 31, 2019 | Dec. 31, 2018
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Entity Information [Line Items] |  |
Other receivables, contracts with customers | $ 39.6 | $ 65.8
Sale Of Accounts Receivable - KCPL and GMO |  |
Accounts receivable pledged as collateral | 359.0 | 365.0
Collateralized note payable | 359.0 | 365.0
Westar Energy |  |
Entity Information [Line Items] |  |
Other receivables, contracts with customers | 36.8 | 55.9
Sale Of Accounts Receivable - KCPL and GMO |  |
Accounts receivable pledged as collateral | 185.0 | 185.0
Collateralized note payable | 185.0 | 185.0
Maximum amount of outstanding principal under receivables agreement from mid-Dec to mid-Jan | 185.0 |
Maximum amount of outstanding principal under receivables agreement from mid-Jan to mid Feb | 125.0 |
Maximum amount of outstanding principal under receivables agreement from mid February to mid July | 185.0 |
Maximum amount of outstanding principal under receivable agreement from mid-July to expiration | 200.0 |
KCP&L |  |
Entity Information [Line Items] |  |
Other receivables, contracts with customers | 1.0 | 5.5
Sale Of Accounts Receivable - KCPL and GMO |  |
Accounts receivable pledged as collateral | 124.0 | 130.0
Collateralized note payable | 124.0 | $ 130.0
Maximum amount of outstanding principal under receivables agreement | 130.0 |
GMO |  |
Sale Of Accounts Receivable - KCPL and GMO |  |
Maximum amount of outstanding principal under receivables agreement from mid-November to mid-June | 50.0 |
Maximum amount of outstanding principal under receivables agreement from mid-June to expiration | $ 65.0 |

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