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RECEIVABLES - Summary of Bad Debt Expense (Details) - SEC Schedule, 12-09, Allowance, Credit Loss - Customer Contracts - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Impairment losses recognized on receivables	$ 4.0	$ 4.0
Westar Energy
Accounts, Notes, Loans and Financing Receivable [Line Items]
Impairment losses recognized on receivables	(0.3)	4.0
KCP&L
Accounts, Notes, Loans and Financing Receivable [Line Items]
Impairment losses recognized on receivables	$ 2.8	$ 1.7

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+ References

No definition available.

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- Definition

Amount of increase in valuation and qualifying accounts and reserves from charge to cost and expense.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 4
-Subparagraph (SX 210.12-09)
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690

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