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Investment in Unconsolidated Affiliate and Related Party Transactions Reconciliation of Equity in Earnings of Unconsolidated Affiliates (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2015 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Schedule of Equity Method Investments [Line Items] |  |  |  |
Net income (loss) |  | $ 400.3 | $ 289.5 | $ (752.0)
Timing Differences Related to Equity Method Investee Net Income |  | 0.0 | (12.2) | 12.1
Net Income Used to Calculate Equity in Earnings |  | 400.3 | 268.2 | (739.9)
Proportionate Unconsolidated Affiliate Net Income |  | 102.7 | 70.7 | (194.4)
OGE Energy's share of Enable net income (loss) |  | 102.7 | 73.3 | (16.0)
Amortization of basis difference |  | 11.3 | 11.6 | 13.5
Elimination of Enable fair value step up |  | 17.2 | 16.9 | 18.0
Equity in earnings of unconsolidated affiliates |  | 131.2 | 101.8 | 15.5
Natural Gas Midstream Operations [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity in earnings of unconsolidated affiliates |  | 131.2 | 101.8 | 15.5
Preferred Partner [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Distribution Made to Limited Partner, Cash Distributions Paid |  | $ 0.0 | $ (9.1) | $ 0.0
OGE Holdings [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Limited Liability Company or Limited Partnership, Members or Limited Partners, Ownership Interest |  | 25.70% | 25.70% | 26.30%
OGE Energy [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Goodwill, Impairment Loss | $ (108.4) | $ 0.0 | $ 2.6 | $ 178.4

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