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Investment in Unconsolidated Affiliate and Related Party Transactions Related Party Transactions (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Related Party Transaction [Line Items] |  |  |
Accounts receivable - unconsolidated affiliates | $ 1.7 | $ 5.6 |
Og and E [Member] | Enable Midstream Partners [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Revenue from Related Parties | 13.8 | 13.3 | $ 7.7
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 | 12.0 | 16.8 |
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 | 34.9 | 23.2
Natural Gas Storage [Member] | Og and E [Member] | Enable Midstream Partners [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Related Party Transaction, Purchases from Related Party | 0.0 | 4.4 | 8.6
Natural Gas Purchases [Member] | Og and E [Member] | Enable Midstream Partners [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Related Party Transaction, Purchases from Related Party | 7.6 | 8.7 | $ 14.8
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 | $ 32.1 | $ 104.8 |

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