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v3.19.3

Investment in Unconsolidated Affiliates Related Party Transactions (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Enable Midstream Partners [Member] | OG&E [Member] |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Revenue from Related Parties | $ 4.5 | $ 4.7 | $ 12.1 | $ 12.2 |
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 | 0.3 | 0.5 |
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 | 3.6 | 5.3 | 20.0 | 22.1 |
Natural Gas Transportation [Member] | Enable Midstream Partners [Member] | OG&E [Member] |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Related Party Transaction, Purchases from Related Party | 9.4 | 8.8 | 33.5 | 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 | (1.1) | $ 0.1 | (5.4) | $ 2.6 |
Excluding Fuel Purchases [Member] |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Accounts receivable - unconsolidated affiliates | $ 0.9 |  | $ 0.9 |  | $ 1.7

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