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Investment in Unconsolidated Affiliate and Related Party Transactions Related Party Transactions (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Related Party Transaction [Line Items] |  |  |
Expected Settlement Charge | $ 14.6 |  |
Accounts receivable - unconsolidated affiliates | 1.9 | $ 2.5 |
Og and E [Member] | Enable Midstream Partners [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Revenue from Related Parties | 14.0 | 11.5 | $ 13.8
Operating Costs Charged [Member] | OGE Energy [Member] | Enable Midstream Partners [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Related Party Transaction, Selling, General and Administrative Expenses from Transactions with Related Party | 2.3 | 4.7 | 12.4
Natural Gas Transportation [Member] | Og and E [Member] | Enable Midstream Partners [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Related Party Transaction, Purchases from Related Party | 35.0 | 35.0 | 35.0
Natural Gas Purchases [Member] | Og and E [Member] | Enable Midstream Partners [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Related Party Transaction, Purchases from Related Party | (2.1) | 11.2 | 7.6
Employment Costs [Member] | OGE Energy [Member] | Enable Midstream Partners [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Related Party Transaction, Selling, General and Administrative Expenses from Transactions with Related Party | 29.5 | 28.7 | $ 32.7
Excluding Fuel Purchases [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Accounts receivable - unconsolidated affiliates | $ 2.0 | $ 2.7 |

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