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Summary of Significant Accounting Policies (Tables) | 6 Months Ended
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Jun. 30, 2014
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) | June 30, 2014 | December 31, 2013
Regulatory Assets |  |
Current |  |
Fuel clause under recoveries | $ | 82.1 |  | $ | 26.2 |
Oklahoma demand program rider under recovery (A) | 12.8 |  | 10.6 |
Crossroads wind farm rider under recovery (A) | — |  | 4.7 |
Other (A) | 11.2 |  | 7.3 |
Total Current Regulatory Assets | $ | 106.1 |  | $ | 48.8 |
Non-Current |  |  |  |
Benefit obligations regulatory asset | $ | 222.1 |  | $ | 227.4 |
Income taxes recoverable from customers, net | 56.2 |  | 56.5 |
Smart Grid | 44.1 |  | 44.2 |
Deferred storm expenses | 20.7 |  | 21.6 |
Unamortized loss on reacquired debt | 15.7 |  | 11.8 |
Pension tracker | — |  | 1.4 |
Other | 17.7 |  | 16.2 |
Total Non-Current Regulatory Assets | $ | 376.5 |  | $ | 379.1 |
Regulatory Liabilities |  |  |  |
Current |  |  |  |
Smart Grid rider over recovery (B) | $ | 13.7 |  | $ | 16.7 |
Fuel clause over recoveries | — |  | 0.4 |
Other (B) | 6.3 |  | 3.1 |
Total Current Regulatory Liabilities | $ | 20.0 |  | $ | 20.2 |
Non-Current |  |  |  |
Accrued removal obligations, net | $ | 232.0 |  | $ | 227.7 |
Deferred pension credits | 0.9 |  | 6.5 |
Pension tracker | 6.8 |  | — |
Total Non-Current Regulatory Liabilities | $ | 239.7 |  | $ | 234.2 |
(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 six months ended June 30, 2014 and 2013.
| Six Months Ended
| June 30,
(In millions) | 2014 | 2013
Balance at January 1 | $ | 55.2 |  | $ | 54.0 |
Liabilities settled | — |  | (0.4 | )
Accretion expense | 1.3 |  | 1.1 |
Balance at June 30 | $ | 56.5 |  | $ | 54.7 |
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 six months ended June 30, 2014. 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 interest rate swap hedging losses | Total
Balance at December 31, 2013 | $ | (27.4 | ) | $ | 0.1 |  |  | $ | (5.8 | ) | $ | 5.1 |  | $ | (0.2 | ) | $ | (28.2 | )
Amounts reclassified from accumulated other comprehensive income (loss) | 0.9 |  | — |  |  | 0.5 |  | (0.9 | ) | 0.1 |  | 0.6 |
Net current period other comprehensive income (loss) | 0.9 |  | — |  |  | 0.5 |  | (0.9 | ) | 0.1 |  | 0.6 |
Balance at June 30, 2014 | $ | (26.5 | ) | $ | 0.1 |  |  | $ | (5.3 | ) | $ | 4.2 |  | $ | (0.1 | ) | $ | (27.6 | )
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 six months ended June 30, 2014.
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 | Six Months Ended |
| June 30, 2014 | June 30, 2014 |
Losses on cash flow hedges |  |  |
Interest rate swap | $ | — |  | $ | (0.2 | ) | Interest expense
| — |  | (0.2 | ) | Total before tax
| — |  | (0.1 | ) | Tax benefit
| $ | — |  | $ | (0.1 | ) | Net of tax
Amortization of defined benefit pension items |  |  |
Actuarial losses | $ | (0.8 | ) | $ | (1.5 | ) | (A)
| (0.8 | ) | (1.5 | ) | Total before tax
| (0.3 | ) | (0.6 | ) | Tax benefit
| $ | (0.5 | ) | $ | (0.9 | ) | Net of tax
Amortization of postretirement benefit plan items |  |  |
Actuarial losses | $ | (0.5 | ) | $ | (0.8 | ) | (A)
Prior service credit | 0.8 |  | 1.5 |  | (A)
| 0.3 |  | 0.7 |  | Total before tax
| 0.1 |  | 0.3 |  | Tax expense
| $ | 0.2 |  | $ | 0.4 |  | Net of tax
Total reclassifications for the period | $ | (0.3 | ) | $ | (0.6 | ) | Net of tax
(A) | These accumulated other comprehensive income (loss) components are included in the computation of net periodic benefit cost (see Note 10 for additional information).

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