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Summary of Significant Accounting Policies - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Equity Securities, FV-NI, Unrealized Loss		$ 39.4		$ 282.1
Distributions received		4.0		34.0
Related Party [Member]
Related Party Transaction, Selling, General and Administrative Expenses from Transactions with Related Party	$ 35.6	$ 31.7	$ 109.0	$ 97.8
OGE Energy [Member] | Retained Earnings [Member]
Dividends, Common Stock			$ 500.0

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Amount of paid and unpaid common stock dividends declared with the form of settlement in cash, stock and payment-in-kind (PIK).

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Amount of distribution received from equity method investee for return on investment, classified as operating activities. Excludes distribution for return of investment, classified as investing activities.

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