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Investment in Unconsolidated Affiliate and Related Party Transactions (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Apr. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2015 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | May 01, 2013
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Accounts receivable - unconsolidated affiliates |  |  |  | $ 1.9 | $ 2.5 |  |
Limited Partner Units Owned |  |  |  | 111.0 |  |  |
Distribution Made to Limited Partner, Distributions Declared, Per Unit |  |  |  | $ 0.31800 |  |  |
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity |  |  |  | $ 714.2 | 743.7 |  |
Equity in earnings of unconsolidated affiliates |  |  |  | 131.2 | 101.8 | $ 15.5 |
Enable Midstream Partners [Member] |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Goodwill, Impairment Loss |  |  | $ 1,086.4 |  |  |  |
Partners' Capital Account, Units, Sold in Public Offering | 25.0 |  |  |  |  |  |
Distributions received |  |  |  | $ 141.2 | $ 141.2 | $ 139.3 |
Enogex LLC [Member] |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Percentage of Enogex LLC Contributed |  |  |  |  |  |  | 100.00%
Increase in fair value of net assets |  |  |  |  |  |  | $ 2,200.0
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% |
Subordinated Units Held by Limited Partners of the LLC or LP |  |  |  | 68.2 |  |  |
OGE Energy [Member] |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Goodwill, Impairment Loss |  | $ 108.4 |  | $ 0.0 | $ (2.6) | $ (178.4) |
Percentage Share of Management Rights |  |  |  | 50.00% |  |  |
CenterPoint [Member] |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Percentage Share of Management Rights |  |  |  | 50.00% |  |  |
Natural Gas Midstream Operations [Member] |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Equity in earnings of unconsolidated affiliates |  |  |  | $ 131.2 | $ 101.8 | $ 15.5 |

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