Rate Matters and Regulation - Additional Information (Details) $ in Millions	3 Months Ended
	Mar. 31, 2023 USD ($)
Estimated Refund to SPP	$ 13.0
ARKANSAS [Member]
Public Utilities, Requested Rate Increase (Decrease), Amount	9.6
Impact to Company [Member]
Estimated Refund to SPP	5.0
Customer Impact [Member]
Estimated Refund to SPP	$ 8.0