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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 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 + Details
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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. + 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 + Details
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