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Nature of Operations (Details) item in Millions | 1 Months Ended | 6 Months Ended | 30 Months Ended
--- | --- | --- | ---
Oct. 31, 2021 USD ($) | Sep. 30, 2021 USD ($) | Feb. 28, 2021 USD ($) item | Sep. 30, 2021 USD ($) item | Mar. 31, 2024 USD ($)
Conversion of Stock [Line Items] |  |  |  |  |
Lease term |  | 30 years |  | 30 years |
Lease extension |  | 10 years |  | 10 years |
Forecast [Member] |  |  |  |  |
Conversion of Stock [Line Items] |  |  |  |  |
Payments to Acquire Productive Assets |  |  |  |  | $ 30,000,000.0
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 |  | 30 years |
Lease extension |  | 10 years |  | 10 years |
Scheduled prepayments |  | $ 47,700,000 |  | $ 47,700,000 |
Lessor Operating Lease Payments Received |  | 5,400,000 | $ 300,000 |  |
Ameren [Member] | Subsequent Event [Member] |  |  |  |  |
Conversion of Stock [Line Items] |  |  |  |  |
Lessor Operating Lease Payments Received | $ 17,200,000 |  |  |  |
SDG&E [Member] |  |  |  |  |
Conversion of Stock [Line Items] |  |  |  |  |
Number of people | item |  |  | 3.6 | 3.6 |
Payments to Acquire Productive Assets |  |  | $ 20,000,000.0 |  |
Asset Acquisition, Consideration Transferred |  |  | $ 50,000,000.0 |  |
Asset Acquisition, Contingent Consideration, Liability |  | $ 0 |  | $ 0 |
Evergy [Member] |  |  |  |  |
Conversion of Stock [Line Items] |  |  |  |  |
Number of people | item |  |  |  | 3.9 |
Lease term |  | 20 years |  | 20 years |
Lease extension |  | 10 years |  | 10 years |
Scheduled prepayments |  | $ 30,200,000 |  | $ 30,200,000 |
Maximum [Member] | Ameren [Member] |  |  |  |  |
Conversion of Stock [Line Items] |  |  |  |  |
Lease term |  | 40 years |  | 40 years |
Maximum [Member] | Evergy [Member] |  |  |  |  |
Conversion of Stock [Line Items] |  |  |  |  |
Lease term |  | 40 years |  | 40 years |

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