The proportionate share of interest (percent) in a jointly owned utility plant.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 980
-SubTopic 360
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 10.C)
-URI http://asc.fasb.org/extlink&oid=115995737&loc=d3e659983-123033

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- Definition

Present value of lessee's discounted obligation for lease payments from operating lease, classified as current.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977

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- Definition

Present value of lessee's discounted obligation for lease payments from operating lease, classified as noncurrent.

+ References

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- Definition

Amount of lessee's right to use underlying asset under operating lease.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 1
-Subparagraph (a)
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- Definition

Amount of transactions with related party during the financial reporting period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 1
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- Definition

Receivables to be collected from (obligations owed to) related parties, net as of the balance sheet date within one year where one party can exercise control or significant influence over another party; including affiliates, owners or officers and their immediate families, pension trusts, and so forth.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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RELATED PARTY TRANSACTIONS AND RELATIONSHIPS (Details) - USD ($)	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Evergy Metro \| Money Pool
Related Party Transaction [Line Items]
Due from (to) related parties	$ 0		$ 0
Evergy Metro \| Evergy Missouri West Inc
Related Party Transaction [Line Items]
Due from (to) related parties	85,200,000		78,700,000
Evergy Metro \| Evergy Missouri West Inc \| Operating Expenses and Capital Costs Billed
Related Party Transaction [Line Items]
Related party transaction	39,300,000	$ 42,000,000.0
Evergy Metro \| Evergy Kansas Central
Related Party Transaction [Line Items]
Due from (to) related parties	16,100,000		14,900,000
Evergy Metro \| Evergy Kansas Central \| Operating Expenses and Capital Costs Billed
Related Party Transaction [Line Items]
Related party transaction	48,100,000	31,500,000
Evergy Metro \| Evergy
Related Party Transaction [Line Items]
Due from (to) related parties	26,500,000		(4,300,000)
Evergy Metro \| Evergy \| Income Taxes Payable
Related Party Transaction [Line Items]
Due from (to) related parties	4,200,000		14,100,000
Evergy Kansas Central \| Evergy Missouri West Inc
Related Party Transaction [Line Items]
Due from (to) related parties	1,300,000		3,100,000
Evergy Kansas Central \| Evergy Missouri West Inc \| Operating Expenses and Capital Costs Billed
Related Party Transaction [Line Items]
Related party transaction	4,300,000	6,300,000
Evergy Kansas Central \| Evergy Metro
Related Party Transaction [Line Items]
Due from (to) related parties	(16,100,000)		(14,900,000)
Evergy Kansas Central \| Evergy Metro \| Operating Expenses and Capital Costs Billed
Related Party Transaction [Line Items]
Related party transaction	15,000,000.0	$ 7,400,000
Evergy Kansas Central \| Evergy
Related Party Transaction [Line Items]
Due from (to) related parties	(700,000)		6,900,000
Evergy Kansas Central \| Evergy \| Income Tax Receivable
Related Party Transaction [Line Items]
Due from (to) related parties	(33,600,000)		(37,900,000)
Evergy Kansas Central \| Evergy Metro \| Subsidiary of Common Parent
Related Party Transaction [Line Items]
Right-of-use assets under operating leases	29,300,000		29,500,000
Lease liability recorded in other current liabilities	700,000		600,000
Total long-term obligations under operating leases	$ 28,600,000		$ 28,900,000
Jointly Owned Electricity Generation Plant Iatan No 1 And 2 \| Evergy Missouri West Inc
Related Party Transaction [Line Items]
Jointly owned utility plant, proportionate ownership share	18.00%
Jeffrey Energy Center \| Evergy Missouri West Inc
Related Party Transaction [Line Items]
Jointly owned utility plant, proportionate ownership share	8.00%
La Cygne Station \| Evergy Kansas Central
Related Party Transaction [Line Items]
Jointly owned utility plant, proportionate ownership share	50.00%