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v3.21.2

Related Party Transactions (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Related Party Transaction [Line Items] |  |  |  |  |
Expected Settlement Charge |  |  | $ 17.6 |  |
Enable Midstream Partners [Member] | OG&E [Member] |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Revenue from Related Parties | $ (4.1) | $ (4.5) | (10.0) | $ (11.7) |
OG&E [Member] | OGE Energy [Member] |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Related Party Transaction, Selling, General and Administrative Expenses from Transactions with Related Party | 32.2 | 32.7 | 101.3 | 107.5 |
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 | 0.1 | 0.3 | 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 | 2.5 | 3.5 | 10.3 | 13.6 |
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 | 9.3 | 23.4 | 23.4 |
Natural Gas Purchases [Member] | Enable Midstream Partners [Member] | OG&E [Member] |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Revenue from Related Parties | (7.7) | $ 3.2 | (28.3) | $ 2.2 |
Excluding Fuel Purchases [Member] |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Accounts receivable - unconsolidated affiliates | $ 1.1 |  | $ 1.1 |  | $ 2.0

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