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RELATED PARTY TRANSACTIONS AND RELATIONSHIPS (Details) - USD ($)	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Related Party Transaction [Line Items]
Less: current portion	$ 16,100,000
Total long-term obligations under operating leases	86,900,000
Westar Energy
Related Party Transaction [Line Items]
Less: current portion	10,500,000
Total long-term obligations under operating leases	24,300,000
Westar Energy | GMO
Related Party Transaction [Line Items]
Due from (to) related parties	2,500,000		$ 2,600,000
Westar Energy | KCP&L
Related Party Transaction [Line Items]
Due from (to) related parties	(8,300,000)		(13,500,000)
Westar Energy | KCP&L | Operating Expenses and Capital Costs Billed
Related Party Transaction [Line Items]
Related party transaction	7,400,000
Westar Energy | Evergy
Related Party Transaction [Line Items]
Due from (to) related parties	(500,000)		(1,400,000)
Westar Energy | Evergy | Income Tax Receivable
Related Party Transaction [Line Items]
Due from (to) related parties	32,000,000		42,700,000
KCP&L
Related Party Transaction [Line Items]
Less: current portion	6,300,000
Total long-term obligations under operating leases	93,000,000
KCP&L | Money Pool
Related Party Transaction [Line Items]
Due from (to) related parties	0		0
KCP&L | GMO
Related Party Transaction [Line Items]
Due from (to) related parties	53,600,000		72,600,000
KCP&L | Westar Energy
Related Party Transaction [Line Items]
Due from (to) related parties	8,300,000		13,500,000
KCP&L | Evergy
Related Party Transaction [Line Items]
Due from (to) related parties	19,300,000		15,700,000
KCP&L | Evergy | Income Taxes Payable
Related Party Transaction [Line Items]
Due from (to) related parties	$ (10,600,000)		$ (2,000,000)
Iatan No 1 And 2 | GMO
Related Party Transaction [Line Items]
Jointly owned utility plant, proportionate ownership share	18.00%
Iatan No 1 And 2 | KCP&L | GMO | Operating Expenses and Capital Costs Billed
Related Party Transaction [Line Items]
Related party transaction	$ 42,000,000	$ 46,400,000
Jeffrey Energy Center | GMO
Related Party Transaction [Line Items]
Jointly owned utility plant, proportionate ownership share	8.00%
Jeffrey Energy Center | Westar Energy | GMO | Operating Expenses and Capital Costs Billed
Related Party Transaction [Line Items]
Related party transaction	$ 6,300,000
La Cygne Station | Westar Energy
Related Party Transaction [Line Items]
Jointly owned utility plant, proportionate ownership share	50.00%
La Cygne Station | KCP&L | Westar Energy | Operating Expenses and Capital Costs Billed
Related Party Transaction [Line Items]
Related party transaction	$ 31,500,000
Westar Energy | KCP&L | Subsidiary of Common Parent
Related Party Transaction [Line Items]
Operating lease, right-of-use asset	30,000,000
Less: current portion	600,000
Total long-term obligations under operating leases	$ 29,400,000

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- Definition

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

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