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Summary of Significant Accounting Policies - Reconciliation of Equity in Earnings (Losses) of Unconsolidated Affiliates (Parenthetical) (Details) - USD ($)
$ in Millions
11 Months Ended 12 Months Ended
Mar. 31, 2020
Dec. 02, 2021
Dec. 31, 2020
Schedule of Equity Method Investments [Line Items]      
Equity Method Investment, Other than Temporary Impairment $ 780.0 $ (0.0) [1] $ 780.0 [1]
[1] During the year ended December 31, 2020, OGE Energy recorded a $780.0 million impairment on its investment in Enable as, effective March 31, 2020, OGE estimated the fair value of its investment in Enable was below the book value and concluded the decline in value was not temporary.