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Summary of Significant Accounting Policies (Tables) | 9 Months Ended
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Sep. 30, 2013
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Schedule of Regulatory Assets and Liabilities [Table Text Block] | The following table is a summary of OG&E's regulatory assets and liabilities at:
(In millions) | September 30, 2013 | December 31, 2012
Regulatory Assets |  |
Current |  |
Oklahoma demand program rider under recovery (A) | $ | 9.5 |  | $ | 9.2 |
Crossroads wind farm rider under recovery (A) | 7.2 |  | 14.9 |
Other (A) | 6.8 |  | 2.9 |
Total Current Regulatory Assets | $ | 23.5 |  | $ | 27.0 |
Non-Current |  |  |  |
Benefit obligations regulatory asset | $ | 350.1 |  | $ | 370.6 |
Income taxes recoverable from customers, net | 55.7 |  | 54.7 |
Smart Grid | 43.4 |  | 42.8 |
Deferred storm expenses | 18.3 |  | 12.7 |
Unamortized loss on reacquired debt | 12.1 |  | 13.0 |
Deferred pension expenses | 1.9 |  | 4.5 |
Other | 14.7 |  | 12.3 |
Total Non-Current Regulatory Assets | $ | 496.2 |  | $ | 510.6 |
Regulatory Liabilities |  |  |  |
Current |  |  |  |
Fuel clause over recoveries | $ | 12.0 |  | $ | 109.2 |
Smart Grid rider over recovery (B) | 19.1 |  | 24.1 |
Other (B) | 2.6 |  | 7.8 |
Total Current Regulatory Liabilities | $ | 33.7 |  | $ | 141.1 |
Non-Current |  |  |  |
Accrued removal obligations, net | $ | 219.2 |  | $ | 218.2 |
Pension tracker | 14.2 |  | 9.2 |
Deferred pension credits | 9.3 |  | 17.7 |
Total Non-Current Regulatory Liabilities | $ | 242.7 |  | $ | 245.1 |
(A) | Included in Other Current Assets on the Condensed Consolidated Balance Sheets.
(B) | Included in Other Current Liabilities on the Condensed Consolidated Balance Sheets.
Schedule of Change in Asset Retirement Obligation [Table Text Block] | The following table summarizes changes to the Company's asset retirement obligations during the nine months ended September 30, 2013 and 2012.
| Nine Months Ended
| September 30,
(In millions) | 2013 | 2012
Balance at January 1 | $ | 54.0 |  | $ | 24.8 |
Liabilities settled (A) | (0.4 | ) | 0.3 |
Accretion expense | 1.7 |  | 1.6 |
Revisions in estimated cash flows (B) | (0.7 | ) | 26.7 |
Balance at September 30 | $ | 54.6 |  | $ | 53.4 |
(A) | As a result of the formation of Enable Midstream Partners on May 1, 2013, the Company has no obligations at September 30, 2013 under OGE Holdings' asset retirement obligations previously disclosed in the Company's 2012 10-K.
(B) | Due to changes to OG&E's asset retirement obligations related to its wind farms as a result of changes in the assumption related to the timing of removal used in the valuation of the asset retirement obligations.
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] | The following table summarizes changes in the components of accumulated other comprehensive loss attributable to OGE Energy during the nine months ended September 30, 2013. All amounts below are presented net of tax and noncontrolling interest.
| Pension Plan and Restoration of Retirement Income Plan |  | Postretirement Benefit Plans |  |  |  |
| Net loss | Prior service cost |  | Net loss | Prior service cost | Deferred commodity contracts hedging gains | Deferred interest rate swap hedging losses | Less: Noncontrolling interest | Total
Balance at December 31, 2012 | $ | (49.3 | ) | $ | 0.1 |  |  | $ | (15.7 | ) | $ | 7.2 |  | $ | 0.1 |  | $ | (0.5 | ) | $ | (9.0 | ) | $ | (49.1 | )
Amounts reclassified from accumulated other comprehensive income (loss) | 2.8 |  | — |  |  | 1.6 |  | (1.4 | ) | 0.2 |  | 0.2 |  | 0.1 |  | 3.3 |
Deconsolidation of Enogex Holdings | 2.8 |  | — |  |  | 1.0 |  | (0.3 | ) | (0.7 | ) | — |  | 8.9 |  | (6.1 | )
Net current period other comprehensive income (loss) | 5.6 |  | — |  |  | 2.6 |  | (1.7 | ) | (0.5 | ) | 0.2 |  | 9.0 |  | (2.8 | )
Balance at September 30, 2013 | $ | (43.7 | ) | $ | 0.1 |  |  | $ | (13.1 | ) | $ | 5.5 |  | $ | (0.4 | ) | $ | (0.3 | ) | $ | — |  | $ | (51.9 | )
Schedule of Amounts Reclassified out of Accumulated Other Comprehensive Income [Table Text Block] | The following table summarizes significant amounts reclassified out of accumulated other comprehensive loss by the respective line items in net income during the three and nine months ended September 30, 2013.
Details about Accumulated Other Comprehensive Loss Components | Amount Reclassified from Accumulated Other Comprehensive Income (Loss) | Affected Line Item in the Statement Where Net Income is Presented
| Three Months Ended | Nine Months Ended |
| September 30, 2013 | September 30, 2013 |
Gains (losses) on cash flow hedges |  |  |
Commodity contracts | $ | (0.6 | ) | $ | (0.4 | ) | Cost of goods sold
Interest rate swap | (0.1 | ) | (0.3 | ) | Interest expense
| (0.7 | ) | (0.7 | ) | Total before tax
| (0.3 | ) | (0.3 | ) | Tax benefit
| $ | (0.4 | ) | $ | (0.4 | ) | Net of tax
Amortization of defined benefit pension items |  |  |
Actuarial gains (losses) | $ | (1.5 | ) | $ | (4.6 | ) | (A)
Prior service cost | — |  | — |  | (A)
| (1.5 | ) | (4.6 | ) | Total before tax
| (0.6 | ) | (1.8 | ) | Tax benefit
| (0.9 | ) | (2.8 | ) | Net of tax
| — |  | (0.1 | ) | Noncontrolling interest
| $ | (0.9 | ) | $ | (2.7 | ) | Net of tax and noncontrolling interest
Amortization of postretirement benefit plan items |  |  |
Actuarial gains (losses) | $ | (0.9 | ) | $ | (2.5 | ) | (A)
Prior service cost | 0.8 |  | 2.2 |  | (A)
| (0.1 | ) | (0.3 | ) | Total before tax
| — |  | (0.1 | ) | Tax benefit
| $ | (0.1 | ) | $ | (0.2 | ) | Net of tax
Total reclassifications for the period | $ | (1.4 | ) | $ | (3.3 | ) | Net of tax and noncontrolling interest
(A) | These accumulated other comprehensive income (loss) components are included in the computation of net periodic benefit cost (see Note 11 for additional information).

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