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Summary of Significant Accounting Policies | 9 Months Ended
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Sep. 30, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Significant Accounting Policies [Text Block] | Summary of Significant Accounting Policies The Company's significant accounting policies are detailed in "Note 1. Summary of Significant Accounting Policies" in the Company's 2017 Form 10-K. Changes to the Company's accounting policies as a result of adopting ASU 2014-09, "Revenue from Contracts with Customers (Topic 606)," are discussed in Note 3 in this Form 10-Q.
Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] | Organization The Company is a holding company with investments in energy and energy services providers offering physical delivery and related services for both electricity and natural gas primarily in the south central U.S. The Company conducts these activities through two business segments: (i) electric utility and (ii) natural gas midstream operations. The accounts of the Company and its wholly owned subsidiaries are included in the Condensed Consolidated Financial Statements. All intercompany transactions and balances are eliminated in consolidation. The Company generally uses the equity method of accounting for investments where its ownership interest is between 20 percent and 50 percent and it lacks the power to direct activities that most significantly impact economic performance. The electric utility segment generates, transmits, distributes and sells electric energy in Oklahoma and western Arkansas. Its operations are conducted through OG&E and are subject to regulation by the OCC, the APSC and the FERC. OG&E was incorporated in 1902 under the laws of the Oklahoma Territory and is a wholly owned subsidiary of the Company. OG&E is the largest electric utility in Oklahoma, and its franchised service territory includes Fort Smith, Arkansas and the surrounding communities. OG&E sold its retail natural gas business in 1928 and is no longer engaged in the natural gas distribution business. The natural gas midstream operations segment represents the Company's investment in Enable through wholly owned subsidiaries and ultimately OGE Holdings. Enable is engaged in the business of gathering, processing, transporting and storing natural gas. Enable's natural gas gathering and processing assets are strategically located in four states and serve natural gas production from shale developments in the Anadarko, Arkoma and Ark-La-Tex Basins. Enable also owns an emerging crude oil gathering business in the Bakken Shale formation, principally located in the Williston Basin of North Dakota. Enable's natural gas transportation and storage assets extend from western Oklahoma and the Texas Panhandle to Alabama and from Louisiana to Illinois. Enable was formed effective May 1, 2013 by the Company, the ArcLight group and CenterPoint to own and operate the midstream businesses of the Company and CenterPoint. In the formation transaction, the Company and the ArcLight group contributed Enogex LLC to Enable, and the Company deconsolidated its previously held investment in Enogex Holdings and acquired an equity interest in Enable. The Company determined that its contribution of Enogex LLC to Enable met the requirements of being in substance real estate and was recorded at historical cost. The general partner of Enable is equally controlled by the Company and CenterPoint, who each have 50 percent management ownership. Based on the 50/50 management ownership, with neither company having control, the Company began accounting for its interest in Enable using the equity method of accounting.
Basis of Accounting [Text Block] | Basis of Presentation The Condensed Consolidated Financial Statements included herein have been prepared by the Company, without audit, pursuant to the rules and regulations of the Securities and Exchange Commission. Certain information and footnote disclosures normally included in financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to such rules and regulations; however, the Company believes that the disclosures are adequate to prevent the information presented from being misleading. In the opinion of management, all adjustments necessary to fairly present the consolidated financial position of the Company at September 30, 2018 and December 31, 2017, the consolidated results of its operations for the three and nine months ended September 30, 2018 and 2017 and its consolidated cash flows for the nine months ended September 30, 2018 and 2017 have been included and are of a normal, recurring nature except as otherwise disclosed. Management also has evaluated the impact of events occurring after September 30, 2018 up to the date of issuance of these Condensed Consolidated Financial Statements, and these statements contain all necessary adjustments and disclosures resulting from that evaluation. Due to seasonal fluctuations and other factors, the Company's operating results for the three and nine months ended September 30, 2018 are not necessarily indicative of the results that may be expected for the year ending December 31, 2018 or for any future period. The Condensed Consolidated Financial Statements and Notes thereto should be read in conjunction with the audited Consolidated Financial Statements and Notes thereto included in the Company's 2017 Form 10-K.
Schedule of Regulatory Assets and Liabilities | Accounting Records The accounting records of OG&E are maintained in accordance with the Uniform System of Accounts prescribed by the FERC and adopted by the OCC and the APSC. Additionally, OG&E, as a regulated utility, is subject to accounting principles for certain types of rate-regulated activities, which provide that certain incurred costs that would otherwise be charged to expense can be deferred as regulatory assets, based on the expected recovery from customers in future rates. Likewise, certain actual or anticipated credits that would otherwise reduce expense can be deferred as regulatory liabilities, based on the expected flowback to customers in future rates. Management's expected recovery of deferred costs and flowback of deferred credits generally results from specific decisions by regulators granting such ratemaking treatment. OG&E records certain incurred costs and obligations as regulatory assets or liabilities if, based on regulatory orders or other available evidence, it is probable that the costs or obligations will be included in amounts allowable for recovery or refund in future rates. The following table is a summary of OG&E's regulatory assets and liabilities.
| September 30, | December 31,
(In millions) | 2018 | 2017
REGULATORY ASSETS |  |
Current: |  |
Oklahoma demand program rider under recovery (A) | $ | 10.7 |  | $ | 31.6 |
Production tax credit rider under recovery (A) | 6.1 |  | — |
SPP cost tracker under recovery (A) | — |  | 7.7 |
Other (A) | 1.6 |  | 1.5 |
Total current regulatory assets | $ | 18.4 |  | $ | 40.8 |
Non-current: |  |  |  |
Benefit obligations regulatory asset | $ | 160.8 |  | $ | 177.2 |
Deferred storm expenses | 37.4 |  | 42.2 |
Smart Grid | 27.5 |  | 32.8 |
Unamortized loss on reacquired debt | 11.6 |  | 12.3 |
Other | 18.9 |  | 18.5 |
Total non-current regulatory assets | $ | 256.2 |  | $ | 283.0 |
REGULATORY LIABILITIES |  |  |  |
Current: |  |  |  |
Fuel clause over recoveries | $ | 39.2 |  | $ | 1.7 |
SPP cost tracker over recovery (B) | 9.4 |  | — |
Other (B) | 3.5 |  | 2.2 |
Total current regulatory liabilities | $ | 52.1 |  | $ | 3.9 |
Non-current: |  |  |  |
Income taxes refundable to customers, net | $ | 943.9 |  | $ | 955.5 |
Accrued removal obligations, net | 308.2 |  | 288.4 |
Pension tracker | 32.0 |  | 32.3 |
Other | 6.9 |  | 7.2 |
Total non-current regulatory liabilities | $ | 1,291.0 |  | $ | 1,283.4 |
(A) | Included in Other Current Assets on the Condensed Consolidated Balance Sheets.
(B) | Included in Other Current Liabilities on the Condensed Consolidated Balance Sheets.
As discussed in Note 14 under "Oklahoma Rate Review Filing - 2018," as a result of the settlement agreement reached in the most recent Oklahoma rate review, OG&E removed production tax credits from base rates and now utilizes a separate rider to credit customers the differential between estimated and actual production tax credits, which can either result in a regulatory asset or regulatory liability based on that differential. Management continuously monitors the future recoverability of regulatory assets. When in management's judgment future recovery becomes impaired, the amount of the regulatory asset is adjusted, as appropriate. If OG&E were required to discontinue the application of accounting principles for certain types of rate-regulated activities for some or all of its operations, it could result in writing off the related regulatory assets or liabilities, which could have significant financial effects.
Comprehensive Income (Loss) Note [Text Block] | Accumulated Other Comprehensive Income (Loss) The following tables summarize changes in the components of accumulated other comprehensive income (loss) attributable to the Company during the nine months ended September 30, 2018 and 2017. All amounts below are presented net of tax.
| Pension Plan and Restoration of Retirement Income Plan |  | Postretirement Benefit Plans |
(In millions) | Net Income (Loss) | Prior Service Cost |  | Net Income | Prior Service Credit | Total
Balance at December 31, 2017 | $ | (32.7 | ) | $ | — |  |  | $ | 2.5 |  | $ | 7.0 |  | $ | (23.2 | )
Amounts reclassified from accumulated other comprehensive income (loss) | 2.5 |  | — |  |  | — |  | (1.3 | ) | 1.2 |
Settlement cost | 3.1 |  | — |  |  | — |  | — |  | 3.1 |
Balance at September 30, 2018 | $ | (27.1 | ) | $ | — |  |  | $ | 2.5 |  | $ | 5.7 |  | $ | (18.9 | )
| Pension Plan and Restoration of Retirement Income Plan |  | Postretirement Benefit Plans |
(In millions) | Net Income (Loss) | Prior Service Cost |  | Net Income | Prior Service Cost (Credit) | Total
Balance at December 31, 2016 | $ | (32.1 | ) | $ | 0.1 |  |  | $ | 2.7 |  | $ | — |  | $ | (29.3 | )
Other comprehensive income before reclassifications | — |  | — |  |  | — |  | 6.7 |  | 6.7 |
Amounts reclassified from accumulated other comprehensive income (loss) | 2.0 |  | — |  |  | — |  | (0.2 | ) | 1.8 |
Settlement cost | — |  | — |  |  | 0.5 |  | — |  | 0.5 |
Net current period other comprehensive income | 2.0 |  | — |  |  | 0.5 |  | 6.5 |  | 9.0 |
Balance at September 30, 2017 | $ | (30.1 | ) | $ | 0.1 |  |  | $ | 3.2 |  | $ | 6.5 |  | $ | (20.3 | )
The following table summarizes significant amounts reclassified out of accumulated other comprehensive income (loss) by the respective line items in net income during the three and nine months ended September 30, 2018 and 2017.
Details about Accumulated Other Comprehensive Income (Loss) Components | Amount Reclassified from Accumulated Other Comprehensive Income (Loss) | Affected Line Item in the Condensed Consolidated Statements of Income
| Three Months Ended | Nine Months Ended |
| September 30, | September 30, |
(In millions) | 2018 | 2017 | 2018 | 2017 |
Amortization of Pension Plan and Restoration of Retirement Income Plan items: |  |  |  |  |
Actuarial losses (A) | $ | (1.1 | ) | $ | (1.1 | ) | $ | (3.3 | ) | $ | (3.3 | ) | Other Net Periodic Benefit Income (Expense)
Settlement cost (A) | (4.2 | ) | — |  | (4.2 | ) | — |  | Other Net Periodic Benefit Income (Expense)
| (5.3 | ) | (1.1 | ) | (7.5 | ) | (3.3 | ) | Income Before Taxes
| (1.4 | ) | (0.5 | ) | (1.9 | ) | (1.3 | ) | Income Tax Expense
| $ | (3.9 | ) | $ | (0.6 | ) | $ | (5.6 | ) | $ | (2.0 | ) | Net Income
Amortization of postretirement benefit plans items: |  |  |  |  |
Prior service credit (A) | $ | 0.6 |  | $ | 0.4 |  | $ | 1.7 |  | $ | 0.4 |  | Other Net Periodic Benefit Income (Expense)
Settlement cost (A) | — |  | (0.7 | ) | — |  | (0.7 | ) | Other Net Periodic Benefit Income (Expense)
| 0.6 |  | (0.3 | ) | 1.7 |  | (0.3 | ) | Income Before Taxes
| 0.1 |  | — |  | 0.4 |  | — |  | Income Tax Expense
| $ | 0.5 |  | $ | (0.3 | ) | $ | 1.3 |  | $ | (0.3 | ) | Net Income
Total reclassifications for the period, net of tax | $ | (3.4 | ) | $ | (0.9 | ) | $ | (4.3 | ) | $ | (2.3 | ) | Net Income
(A) | These accumulated other comprehensive income (loss) components are included in the computation of net periodic benefit cost (see Note 11 for additional information).
Reclassifications [Text Block] | Reclassifications Certain prior-year amounts have been reclassified to conform to the current year presentation. Amounts for the three and nine months ended September 30, 2017 have been adjusted for the reclassification of net periodic benefit cost components and the regulatory Pension tracker mechanism between Other Operation and Maintenance and Other Net Periodic Benefit Income (Expense) on the Company's Condensed Consolidated Statements of Income to be consistent with the 2018 presentation due to the Company's adoption of ASU 2017-07, "Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost." Further discussion can be found in Note 11.

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