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v3.19.2

Investment in Unconsolidated Affiliates Related Party Transactions (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Enable Midstream Partners [Member] | OG&E [Member] |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Revenue from Related Parties | $ 3.8 | $ 3.6 | $ 7.6 | $ 7.6 |
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 | 0.1 | 0.2 | 0.2 | 0.3 |
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 | 4.0 | 5.2 | 16.4 | 16.8 |
Natural Gas Transportation [Member] | Enable Midstream Partners [Member] | OG&E [Member] |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Related Party Transaction, Purchases from Related Party | 9.3 | 8.8 | 24.1 | 17.5 |
Natural Gas Purchases [Member] | Enable Midstream Partners [Member] | OG&E [Member] |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Related Party Transaction, Purchases from Related Party | (3.3) | $ 2.2 | (4.3) | $ 2.5 |
Excluding Fuel Purchases [Member] |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Accounts receivable - unconsolidated affiliates | $ 1.2 |  | $ 1.2 |  | $ 1.7

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