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ORGANIZATION AND BASIS OF PRESENTATION - Fuel Inventory and Supplies (Details) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Inventory [Line Items]
Fuel inventory	$ 132.2	$ 168.9
Supplies	334.3	342.1
Fuel inventory and supplies	466.5	511.0
Westar Energy
Inventory [Line Items]
Fuel inventory	74.2	87.8
Supplies	180.8	189.0
Fuel inventory and supplies	255.0	276.8
KCP&L
Inventory [Line Items]
Fuel inventory	39.2	57.8
Supplies	120.1	119.8
Fuel inventory and supplies	$ 159.3	$ 177.6

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- Definition

Energy Related Inventory, Supplies

+ References

No definition available.

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- Definition

Carrying amount as of the balance sheet date of merchandise, goods, commodities, or supplies relating to a source of usable power held for future sale or future use in manufacturing or production process.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.6(a))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

Carrying amount as of the balance sheet date of coal, which is a combustible rock or minerals which are extracted from the ground and used as fuel.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.6(a))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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