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Nature of Operations and Basis of Presentation (Narrative) (Details) item in Millions, $ in Millions | 1 Months Ended | 9 Months Ended
--- | --- | ---
Oct. 31, 2021 USD ($) | Sep. 30, 2021 USD ($) | Feb. 28, 2021 USD ($) | Dec. 31, 2021 USD ($) item
Conversion of Stock [Line Items] |  |  |  |
Lease extension |  |  |  | 10 years
Ameren [Member] |  |  |  |
Conversion of Stock [Line Items] |  |  |  |
Number of people | item |  |  |  | 7.5
Lessor Operating Lease Term Of Contract, Combined |  |  |  | 40 years
Lease term |  |  |  | 30 years
Lease extension |  |  |  | 10 years
Scheduled prepayments |  |  |  | $ 47.7
Lessor Operating Lease Payments Received | $ 17.2 | $ 5.4 | $ 0.3 |
Evergy [Member] |  |  |  |
Conversion of Stock [Line Items] |  |  |  |
Number of people | item |  |  |  | 3.9
Lease term |  |  |  | 20 years
Lease extension |  |  |  | 10 years
Scheduled prepayments |  |  |  | $ 30.2
Maximum [Member] | Ameren [Member] |  |  |  |
Conversion of Stock [Line Items] |  |  |  |
Lease term |  |  |  | 40 years
Maximum [Member] | Evergy [Member] |  |  |  |
Conversion of Stock [Line Items] |  |  |  |
Lease term |  |  |  | 40 years

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- Definition Amount of lease payments to be received by lessor for operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 30 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=124258985&loc=SL77919396-209981 + Details
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