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RECEIVABLES - Narrative (Details) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
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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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.

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