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Investment in Unconsolidated Affiliate and Related Party Transactions Related Party Transactions (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Related Party Transaction [Line Items] |  |  |
Expected Settlement Charge | $ 20.4 |  |
Og and E [Member] | Enable Midstream Partners [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Revenue from Related Parties | 16.3 | $ 14.0 | $ 11.5
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 | 0.6 | 2.3 | 4.7
Natural Gas Transportation [Member] | Og and E [Member] | Enable Midstream Partners [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Related Party Transaction, Purchases from Related Party | 37.9 | 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 | (3.2) | (2.1) | 11.2
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 | 27.5 | 29.5 | $ 28.7
Excluding Fuel Purchases [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Accounts receivable - unconsolidated affiliates | $ 1.7 | $ 2.0 |

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