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Summary of Significant Accounting Policies (Tables) | 3 Months Ended
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Mar. 31, 2017
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:
| March 31, | December 31,
(In millions) | 2017 | 2016
Regulatory Assets |  |
Current |  |
Fuel clause under recoveries | $ | 73.4 |  | $ | 51.3 |
Oklahoma demand program rider under recovery (A) | 45.6 |  | 51.0 |
SPP cost tracker under recovery (A) | 14.6 |  | 10.0 |
Other (A) | 8.6 |  | 9.5 |
Total Current Regulatory Assets | $ | 142.2 |  | $ | 121.8 |
Non-Current |  |  |  |
Benefit obligations regulatory asset | $ | 228.9 |  | $ | 232.6 |
Income taxes recoverable from customers, net | 65.6 |  | 62.3 |
Deferred storm expenses | 40.5 |  | 35.7 |
Smart Grid | 38.2 |  | 43.2 |
Unamortized loss on reacquired debt | 13.1 |  | 13.4 |
Other | 16.8 |  | 17.6 |
Total Non-Current Regulatory Assets | $ | 403.1 |  | $ | 404.8 |
Regulatory Liabilities |  |  |  |
Current |  |  |  |
Other (B) | $ | 13.4 |  | $ | 12.3 |
Total Current Regulatory Liabilities | $ | 13.4 |  | $ | 12.3 |
Non-Current |  |  |  |
Accrued removal obligations, net | $ | 268.6 |  | $ | 262.8 |
Pension tracker | 36.6 |  | 35.5 |
Other | 1.5 |  | 1.4 |
Total Non-Current Regulatory Liabilities | $ | 306.7 |  | $ | 299.7 |
(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 three months ended March 31, 2017 and 2016.
| Three Months Ended March 31,
(In millions) | 2017 | 2016
Balance at January 1 | $ | 69.6 |  | $ | 63.3 |
Accretion expense | 0.7 |  | 0.7 |
Balance at March 31 | $ | 70.3 |  | $ | 64.0 |
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 three months ended March 31, 2017 and 2016. 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 (loss) | Prior service cost | Total
Balance at December 31, 2016 | $ | (32.1 | ) | $ | 0.1 |  |  | $ | 2.7 |  | $ | — |  | $ | (29.3 | )
Amounts reclassified from accumulated other comprehensive income (loss) | 0.6 |  | — |  |  | — |  | — |  | 0.6 |
Balance at March 31, 2017 | $ | (31.5 | ) | $ | 0.1 |  |  | $ | 2.7 |  | $ | — |  | $ | (28.7 | )
| Pension Plan and Restoration of Retirement Income Plan |  | Postretirement Benefit Plans |
(In millions) | Net income (loss) | Prior service cost |  | Net income (loss) | 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) | 0.8 |  | — |  |  | — |  | (0.4 | ) | 0.4 |
Balance at March 31, 2016 | $ | (38.4 | ) | $ | 0.1 |  |  | $ | 2.5 |  | $ | 1.1 |  | $ | (34.7 | )
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 months ended March 31, 2017 and 2016.
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 |
| March 31, |
(In millions) | 2017 | 2016 |
Amortization of defined benefit pension and restoration of retirement income plan items |  |  |
Actuarial losses | $ | (1.0 | ) | $ | (1.2 | ) | (A)
| (0.4 | ) | (0.4 | ) | Income taxes
| $ | (0.6 | ) | $ | (0.8 | ) | Net of tax
Amortization of postretirement benefit plan items |  |  |
Prior service credit | $ | — |  | $ | 0.6 |  | (A)
| — |  | 0.6 |  | Total before tax
| — |  | 0.2 |  | Income taxes
| $ | — |  | $ | 0.4 |  | Net of tax
Total reclassifications for the period | $ | (0.6 | ) | $ | (0.4 | ) | 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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