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Investment in Unconsolidated Affiliates Related Party Transactions (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015 | Dec. 31, 2015
Related Party Transaction [Line Items] |  |  |  |  |
Accounts receivable - unconsolidated affiliates | $ 2.4 |  | $ 2.4 |  | $ 1.7
Enable Midstream Partners [Member] | OG&E [Member] |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Revenue from Related Parties | 3.7 | $ 4.4 | 9.0 | $ 11.1 |
Operating Costs Charged [Member] | Enable Midstream Partners [Member] | OGE Energy [Member] |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Related Party Transaction, Selling, General and Administrative Expenses from Transactions with Related Party | 1.0 | 2.6 | 3.6 | 7.9 |
Employment Costs [Member] | Enable Midstream Partners [Member] | OGE Energy [Member] |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Related Party Transaction, Selling, General and Administrative Expenses from Transactions with Related Party | 6.6 | 7.0 | 20.7 | 25.1 |
Natural Gas Transportation [Member] | Enable Midstream Partners [Member] | OG&E [Member] |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Related Party Transaction, Purchases from Related Party | 8.8 | 8.8 | 26.3 | 26.3 |
Natural Gas Purchases [Member] | Enable Midstream Partners [Member] | OG&E [Member] |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Related Party Transaction, Purchases from Related Party | 4.4 | $ 2.5 | 11.3 | $ 7.1 |
Excluding Fuel Purchases [Member] |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Accounts receivable - unconsolidated affiliates | $ 3.7 |  | $ 3.7 |  | $ 3.4

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