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Rate Matters and Regulation - Additional Information (Details) $ in Millions |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 29, 2023 USD ($) | Oct. 31, 2023 USD ($) | Dec. 31, 2028 Megawattsday | Dec. 31, 2027 Megawattsday | Dec. 31, 2026 Megawattsday | Mar. 31, 2024 USD ($)
Estimated Refund to SPP |  |  |  |  |  | $ 13.0
Requested Recovery of Capital Investment | $ 1,300.0 |  |  |  |  |
Arkansas Public Service Commission [Member] |  |  |  |  |  |
Public Utilities, Approved Rate Increase (Decrease), Amount |  | $ 3.5 |  |  |  |
Integrated Resource Plans [Member] | Forecast [Member] |  |  |  |  |  |
Energy generation capacity | Megawattsday |  |  | 1,096 | 431 | 556 |
OKLAHOMA [Member] |  |  |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Amount | $ 332.5 |  |  |  |  |
Public Utilities, Requested Return on Equity, Percentage | 10.50% |  |  |  |  |
Common Equity Percentage which ROE is based | 53.50% |  |  |  |  |
Impact to Company [Member] |  |  |  |  |  |
Estimated Refund to SPP |  |  |  |  |  | 5.0
Customer Impact [Member] |  |  |  |  |  |
Estimated Refund to SPP |  |  |  |  |  | $ 8.0

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