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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Property, Plant and Equipment (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019
Property, Plant and Equipment [Line Items] |  |
Depreciation rates average | 3.00% |
Regulatory assets | $ 2,074.4 | $ 1,972.2
Depreciation expense reflected in retail rates | $ 9.0 |
Minimum |  |
Property, Plant and Equipment [Line Items] |  |
Generating facilities | 8 years |
Transmission facilities | 15 years |
Distribution facilities | 8 years |
Other | 5 years |
Maximum |  |
Property, Plant and Equipment [Line Items] |  |
Generating facilities | 87 years |
Transmission facilities | 94 years |
Distribution facilities | 73 years |
Other | 84 years |
Evergy Kansas Central |  |
Property, Plant and Equipment [Line Items] |  |
Regulatory assets | $ 896.3 | 823.7
Evergy Kansas Central | Minimum |  |
Property, Plant and Equipment [Line Items] |  |
Generating facilities | 8 years |
Transmission facilities | 36 years |
Distribution facilities | 19 years |
Other | 7 years |
Evergy Kansas Central | Maximum |  |
Property, Plant and Equipment [Line Items] |  |
Generating facilities | 87 years |
Transmission facilities | 94 years |
Distribution facilities | 73 years |
Other | 84 years |
Evergy Metro |  |
Property, Plant and Equipment [Line Items] |  |
Regulatory assets | $ 615.5 | 559.8
Evergy Metro | Minimum |  |
Property, Plant and Equipment [Line Items] |  |
Generating facilities | 20 years |
Transmission facilities | 15 years |
Distribution facilities | 8 years |
Other | 5 years |
Evergy Metro | Maximum |  |
Property, Plant and Equipment [Line Items] |  |
Generating facilities | 60 years |
Transmission facilities | 70 years |
Distribution facilities | 55 years |
Other | 50 years |
Retired Generation Facilities |  |
Property, Plant and Equipment [Line Items] |  |
Regulatory assets | $ 128.4 | 130.5
Retired Generation Facilities | Evergy Kansas Central |  |
Property, Plant and Equipment [Line Items] |  |
Regulatory assets | 0.0 | 0.0
Retired Generation Facilities | Evergy Metro |  |
Property, Plant and Equipment [Line Items] |  |
Regulatory assets | $ 0.0 | $ 0.0

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- Definition The expense charged against earnings during the period to allocate the capitalized costs of regulatory assets over the periods expected to benefit from such costs. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.3) -URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Composite depreciation rate for public utility plants in service. + References No definition available. + Details
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- Definition Useful life of utility distribution assets owned by public utility, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Useful life of utility generation assets owned by public utility, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Useful life of other property, plant and equipment (PPE) owned by public utility, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Useful life of utility transmission equipment owned by public utility, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition The amount for the individual regulatory asset as itemized in a table of regulatory assets as of the end of the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 340 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6499975&loc=d3e44250-110382 + Details
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