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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Fuel Inventory and Supplies (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Inventory [Line Items] |  |
Fuel inventory | $ 145.0 | $ 146.4
Supplies | 359.5 | 335.2
Fuel inventory and supplies | 504.5 | 481.6
Evergy Kansas Central |  |
Inventory [Line Items] |  |
Fuel inventory | 79.3 | 80.2
Supplies | 197.1 | 186.2
Fuel inventory and supplies | 276.4 | 266.4
Evergy Metro |  |
Inventory [Line Items] |  |
Fuel inventory | 44.9 | 46.1
Supplies | 125.5 | 116.9
Fuel inventory and supplies | $ 170.4 | $ 163.0

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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=120391452&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=120391452&loc=d3e13212-122682 + Details
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