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Investment in Unconsolidated Affiliate and Related Party Transactions Reconciliation of Equity in Earnings of Unconsolidated Affiliates (Details) - USD ($) $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Net income (loss) |  | $ 289.5 | $ (752.0) |  | $ 530.0
Timing Differences Related to Equity Method Investee Net Income |  | (12.1) | 12.1 |  |
Net Income Used to Calculate Equity in Earnings |  | 268.3 | (739.9) |  |
Proportionate Unconsolidated Affiliate Net Income |  | 70.7 | (194.4) |  |
OGE Energy's share of Enable net income (loss) |  | 73.3 | (16.0) |  |
Amortization of basis difference |  | 11.6 | 13.5 |  |
Elimination of Enable fair value step up |  | 16.9 | 18.0 |  |
Equity in earnings of unconsolidated affiliates |  | 101.8 | 15.5 | [1] | 172.6
Natural Gas Midstream Operations [Member] |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Equity in earnings of unconsolidated affiliates |  | 101.8 | 15.5 | [1] | $ 172.6
Preferred Partner [Member] |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Distribution Made to Limited Partner, Cash Distributions Paid |  | 9.1 | 0.0 |  |
OGE Energy [Member] |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Goodwill, Impairment Loss | $ (108.4) | $ 2.6 | $ 178.4 |  |
[1] | In 2015, The Company recorded a $108.4 million pre-tax charge during the third quarter of 2015 for its share of the goodwill impairment, as adjusted for the basis difference. See Note 3 for further discussion of Enable's goodwill impairment.

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