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RELATED PARTY TRANSACTIONS AND RELATIONSHIPS (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Related Party Transaction [Line Items] |  |  |
Right-of-use assets under operating leases | $ 93.2 |  |
Evergy Metro |  |  |
Related Party Transaction [Line Items] |  |  |
Right-of-use assets under operating leases | 71.3 |  |
Evergy Metro | Evergy Inc Money Pool |  |  |
Related Party Transaction [Line Items] |  |  |
Due from Related Parties, Current | 100.0 |  |
Due to Related Parties, Current | 0.0 |  |
Due from (to) related parties |  | $ 0.0 |
Evergy Metro | Evergy Missouri West |  |  |
Related Party Transaction [Line Items] |  |  |
Due from (to) related parties | 188.1 | 78.7 |
Evergy Metro | Evergy Missouri West | Operating Expenses and Capital Costs Billed |  |  |
Related Party Transaction [Line Items] |  |  |
Related party transaction | 168.7 | 172.8 | $ 183.2
Evergy Metro | Evergy Kansas Central |  |  |
Related Party Transaction [Line Items] |  |  |
Due from (to) related parties | 21.7 | 14.9 |
Evergy Metro | Evergy Kansas Central | Operating Expenses and Capital Costs Billed |  |  |
Related Party Transaction [Line Items] |  |  |
Related party transaction | 130.8 | 154.9 | 82.9
Evergy Metro | Evergy |  |  |
Related Party Transaction [Line Items] |  |  |
Due from (to) related parties | 15.7 | (4.3) |
Evergy Metro | Evergy | Income Tax Receivable |  |  |
Related Party Transaction [Line Items] |  |  |
Due from (to) related parties | 3.2 |  |
Evergy Metro | Evergy | Income Taxes Payable |  |  |
Related Party Transaction [Line Items] |  |  |
Due from (to) related parties |  | 14.1 |
Evergy Kansas Central |  |  |
Related Party Transaction [Line Items] |  |  |
Right-of-use assets under operating leases | 34.4 |  |
Evergy Kansas Central | Evergy Missouri West |  |  |
Related Party Transaction [Line Items] |  |  |
Due from (to) related parties | 6.6 | 3.1 |
Evergy Kansas Central | Evergy Missouri West | Operating Expenses and Capital Costs Billed |  |  |
Related Party Transaction [Line Items] |  |  |
Related party transaction | 37.6 | 24.9 | 12.3
Evergy Kansas Central | Evergy Metro |  |  |
Related Party Transaction [Line Items] |  |  |
Due from (to) related parties | (21.7) | (14.9) |
Evergy Kansas Central | Evergy Metro | Operating Expenses and Capital Costs Billed |  |  |
Related Party Transaction [Line Items] |  |  |
Related party transaction | 34.7 | 40.6 | $ 17.5
Evergy Kansas Central | Evergy |  |  |
Related Party Transaction [Line Items] |  |  |
Due from (to) related parties | 0.1 | 6.9 |
Evergy Kansas Central | Evergy | Income Tax Receivable |  |  |
Related Party Transaction [Line Items] |  |  |
Due from (to) related parties | 25.3 | 37.9 |
Evergy Kansas Central | Evergy Metro | Subsidiary of Common Parent |  |  |
Related Party Transaction [Line Items] |  |  |
Right-of-use assets under operating leases | 28.9 | 29.5 |
Lease liability recorded in other current liabilities | 0.7 | 0.6 |
Total long-term obligations under operating leases | $ 28.2 | $ 28.9 |
Jointly Owned Electricity Generation Plant Iatan No 1 And 2 | Evergy Missouri West |  |  |
Related Party Transaction [Line Items] |  |  |
Jointly owned utility plant, proportionate ownership share | 18.00% |  |
Jeffrey Energy Center | Evergy Missouri West |  |  |
Related Party Transaction [Line Items] |  |  |
Jointly owned utility plant, proportionate ownership share | 8.00% |  |
La Cygne Station | Evergy Kansas Central |  |  |
Related Party Transaction [Line Items] |  |  |
Jointly owned utility plant, proportionate ownership share | 50.00% |  |

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- Definition The aggregate amount of receivables to be collected from related parties where one party can exercise control or significant influence over another party; including affiliates, owners or officers and their immediate families, pension trusts, and so forth, at the financial statement date. which are usually due within one year (or one business cycle). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(k)(1)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 Reference 2: 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(11)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 Reference 4: 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(3)(a)(2)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=121566466&loc=d3e6676-107765 + Details
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