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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Fuel Inventory and Supplies (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
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Inventory [Line Items] |  |
Fuel inventory | $ 257.3 | $ 180.7
Supplies | 518.9 | 492.2
Fuel inventory and supplies | 776.2 | 672.9
Evergy Kansas Central |  |
Inventory [Line Items] |  |
Fuel inventory | 138.6 | 97.2
Supplies | 273.3 | 252.3
Fuel inventory and supplies | 411.9 | 349.5
Evergy Metro |  |
Inventory [Line Items] |  |
Fuel inventory | 81.5 | 59.0
Supplies | 183.1 | 181.6
Fuel inventory and supplies | $ 264.6 | $ 240.6

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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://www.xbrl.org/2009/role/commonPracticeRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(6)(a)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 + 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://www.xbrl.org/2009/role/commonPracticeRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(6)(a)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 + Details
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