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RECEIVABLES - Narrative (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Entity Information [Line Items] |  |
Other receivables, contracts with customers | $ 57.5 | $ 42.0
Accounts receivable pledged as collateral | 360.0 | 339.0
Evergy Kansas Central |  |
Entity Information [Line Items] |  |
Other receivables, contracts with customers | 49.9 | 37.7
Accounts receivable pledged as collateral | 180.0 | 171.0
Evergy Metro |  |
Entity Information [Line Items] |  |
Other receivables, contracts with customers | 6.9 | 1.2
Accounts receivable pledged as collateral | 130.0 | $ 118.0
Maximum amount of outstanding principal under receivables agreement | 130.0 |
Borrowings From Mid October Through Mid June | Evergy Kansas Central |  |
Entity Information [Line Items] |  |
Maximum amount of outstanding principal under receivables agreement | 185.0 |
Borrowing From Mid June Through Expiration | Evergy Kansas Central |  |
Entity Information [Line Items] |  |
Maximum amount of outstanding principal under receivables agreement | 200.0 |
Borrowing From Mid June Through Expiration | Evergy Missouri West |  |
Entity Information [Line Items] |  |
Maximum amount of outstanding principal under receivables agreement | 65.0 |
Borrowings From Mid-November Through Mid-June | Evergy Missouri West |  |
Entity Information [Line Items] |  |
Maximum amount of outstanding principal under receivables agreement | $ 50.0 |

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- Definition Carrying amount of financial assets accounted for as secured borrowings recognized in the transferor's statement of financial position at the end of each period presented. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 50 -Paragraph 1A -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=109249958&loc=SL6224234-111729 + Details
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