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Summary of Significant Accounting Policies (Tables) | 9 Months Ended
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Sep. 30, 2016
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:
| September 30, | December 31,
(In millions) | 2016 | 2015
Regulatory Assets |  |
Current |  |
Oklahoma demand program rider under recovery (A) | $ | 48.9 |  | $ | 36.6 |
SPP cost tracker rider under recovery (A) | 2.4 |  | 4.5 |
Fuel clause under recoveries | 0.5 |  | — |
Other (A) | 7.6 |  | 5.4 |
Total Current Regulatory Assets | $ | 59.4 |  | $ | 46.5 |
Non-Current |  |  |  |
Benefit obligations regulatory asset | $ | 235.0 |  | $ | 242.2 |
Income taxes recoverable from customers, net | 60.0 |  | 56.7 |
Smart Grid | 43.4 |  | 43.6 |
Deferred storm expenses | 35.9 |  | 27.6 |
Unamortized loss on reacquired debt | 13.7 |  | 14.8 |
Other | 16.8 |  | 17.3 |
Total Non-Current Regulatory Assets | $ | 404.8 |  | $ | 402.2 |
Regulatory Liabilities |  |  |  |
Current |  |  |  |
Fuel clause over recoveries | $ | 1.4 |  | $ | 61.3 |
Other (B) | 3.8 |  | 7.5 |
Total Current Regulatory Liabilities | $ | 5.2 |  | $ | 68.8 |
Non-Current |  |  |  |
Accrued removal obligations, net | $ | 260.1 |  | $ | 254.9 |
Pension tracker | 30.9 |  | 17.7 |
Other (C) | 1.0 |  | 1.0 |
Total Non-Current Regulatory Liabilities | $ | 292.0 |  | $ | 273.6 |
(A) | Included in Other Current Assets on the Condensed Consolidated Balance Sheets.
(B) | Included in Other Current Liabilities on the Condensed Consolidated Balance Sheets.
(C) | Prior year amount of $1.0 million reclassified from Deferred Other Liabilities to Non-Current Regulatory Liabilities.
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, 2016 and 2015.
| Nine Months Ended September 30,
(In millions) | 2016 | 2015
Balance at January 1 | $ | 63.3 |  | $ | 58.6 |
Accretion expense | 2.1 |  | 1.9 |
Liabilities settled | (0.2 | ) | (0.4 | )
Revisions in estimated cash flows | — |  | 1.6 |
Balance at September 30 | $ | 65.2 |  | $ | 61.7 |
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] | The following table summarizes changes in the components of accumulated other comprehensive income (loss) attributable to the Company during the nine months ended September 30, 2016 and 2015. All amounts below are presented net of tax.
| Pension Plan and Restoration of Retirement Income Plan |  | Postretirement Benefit Plans |
(In millions) | Net loss | Prior service cost |  | Net income | Prior service cost | Total
Balance at December 31, 2015 | $ | (39.2 | ) | $ | 0.1 |  |  | $ | 2.5 |  | $ | 1.5 |  | $ | (35.1 | )
Amounts reclassified from accumulated other comprehensive income (loss) | 2.3 |  | — |  |  | — |  | (1.2 | ) | 1.1 |
Settlement cost | 5.0 |  | — |  |  | — |  | — |  | 5.0 |
Net current period other comprehensive income (loss) | 7.3 |  | — |  |  | — |  | (1.2 | ) | 6.1 |
Balance at September 30, 2016 | $ | (31.9 | ) | $ | 0.1 |  |  | $ | 2.5 |  | $ | 0.3 |  | $ | (29.0 | )
| Pension Plan and Restoration of Retirement Income Plan |  | Postretirement Benefit Plans |
(In millions) | Net loss | Prior service cost |  | Net loss | Prior service cost | Total
Balance at December 31, 2014 | $ | (36.8 | ) | $ | 0.1 |  |  | $ | (8.0 | ) | $ | 3.3 |  | $ | (41.4 | )
Amounts reclassified from accumulated other comprehensive income (loss) | 1.9 |  | — |  |  | 0.9 |  | (1.3 | ) | 1.5 |
Settlement cost | 3.8 |  | — |  |  | — |  | — |  | 3.8 |
Net current period other comprehensive income (loss) | 5.7 |  | — |  |  | 0.9 |  | (1.3 | ) | 5.3 |
Balance at September 30, 2015 | $ | (31.1 | ) | $ | 0.1 |  |  | $ | (7.1 | ) | $ | 2.0 |  | $ | (36.1 | )
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 income (loss) by the respective line items in net income during the three and nine months ended September 30, 2016 and 2015.
Details about Accumulated Other Comprehensive Income (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, | September 30, |
(In millions) | 2016 | 2015 | 2016 | 2015 |
Amortization of defined benefit pension and restoration of retirement income plan items |  |  |  |  |
Actuarial losses | $ | (1.2 | ) | $ | (1.0 | ) | $ | (3.5 | ) | $ | (3.6 | ) | (A)
Settlement | — |  | (6.2 | ) | (8.2 | ) | (6.2 | ) | (A)
| (1.2 | ) | (7.2 | ) | (11.7 | ) | (9.8 | ) | Total before tax
| (0.4 | ) | (2.7 | ) | (4.4 | ) | (4.1 | ) | Tax benefit
| $ | (0.8 | ) | $ | (4.5 | ) | $ | (7.3 | ) | $ | (5.7 | ) | Net of tax
Amortization of postretirement benefit plan items |  |  |  |  |
Actuarial losses | $ | — |  | $ | (0.5 | ) | $ | — |  | $ | (1.5 | ) | (A)
Prior service credit | 0.6 |  | 0.7 |  | 1.9 |  | 2.1 |  | (A)
| 0.6 |  | 0.2 |  | 1.9 |  | 0.6 |  | Total before tax
| 0.2 |  | 0.1 |  | 0.7 |  | 0.2 |  | Tax expense
| $ | 0.4 |  | $ | 0.1 |  | $ | 1.2 |  | $ | 0.4 |  | Net of tax
Total reclassifications for the period | $ | (0.4 | ) | $ | (4.4 | ) | $ | (6.1 | ) | $ | (5.3 | ) | 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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