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v3.19.3.a.u2

Investment in Unconsolidated Affiliate and Related Party Transactions Related Party Transactions (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Related Party Transaction [Line Items] |  |  |
Expected Settlement Charge | $ 17.3 |  |
Og and E [Member] | Enable Midstream Partners [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Revenue from Related Parties | 15.9 | $ 16.3 | $ 14.0
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 | 0.5 | 0.6 | 2.3
Natural Gas Transportation [Member] | Og and E [Member] | Enable Midstream Partners [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Related Party Transaction, Purchases from Related Party | 41.2 | 37.9 | 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 | (6.0) | (3.2) | (2.1)
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 | 23.2 | 27.5 | $ 29.5
Excluding Fuel Purchases [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Accounts receivable - unconsolidated affiliates | $ 0.8 | $ 1.7 |

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