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Quarterly Financial Data (Tables) | 12 Months Ended
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Dec. 31, 2015
Quarterly Financial Data [Abstract] |
Schedule of Quarterly Financial Information [Table Text Block] | Quarterly Financial Data (Unaudited) Due to the seasonal fluctuations and other factors of the Company's businesses, the operating results for interim periods are not necessarily indicative of the results that may be expected for the year. In the Company's opinion, the following quarterly financial data includes all adjustments, consisting of normal recurring adjustments, necessary to fairly present such amounts. Summarized consolidated quarterly unaudited financial data is as follows:
Quarter ended (In millions, except per share data) |  | March 31 | June 30 | September 30 | December 31 | Total
Operating revenues | 2015 | $ | 480.1 |  | $ | 549.9 |  | $ | 719.8 |  | $ | 447.1 |  | $ | 2,196.9 |
| 2014 | $ | 560.4 |  | $ | 611.8 |  | $ | 754.7 |  | $ | 526.2 |  | $ | 2,453.1 |
Operating income | 2015 | $ | 56.4 |  | $ | 127.2 |  | $ | 250.8 |  | $ | 46.8 |  | $ | 481.2 |
| 2014 | $ | 61.8 |  | $ | 141.8 |  | $ | 248.1 |  | $ | 85.1 |  | $ | 536.8 |
Net income | 2015 | $ | 43.2 |  | $ | 87.5 |  | $ | 111.2 |  | $ | 29.4 |  | $ | 271.3 |
| 2014 | $ | 49.3 |  | $ | 100.8 |  | $ | 187.3 |  | $ | 58.4 |  | $ | 395.8 |
Basic earnings per average common share attributable | 2015 | $ | 0.22 |  | $ | 0.44 |  | $ | 0.55 |  | $ | 0.15 |  | $ | 1.36 |
to OGE Energy common shareholders (A) | 2014 | $ | 0.25 |  | $ | 0.51 |  | $ | 0.94 |  | $ | 0.29 |  | $ | 1.99 |
Diluted earnings per average common share | 2015 | $ | 0.22 |  | $ | 0.44 |  | $ | 0.55 |  | $ | 0.15 |  | $ | 1.36 |
attributable to OGE Energy common shareholders (A) | 2014 | $ | 0.25 |  | $ | 0.50 |  | $ | 0.94 |  | $ | 0.29 |  | $ | 1.98 |
(A) | Due to the impact of dilution on the earnings per share calculation, quarterly earnings per share amounts may not add to the total.

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- Definition Tabular disclosure of the quarterly financial data in the annual financial statements. The disclosure includes financial information for each fiscal quarter for the current and previous year, including revenues, gross profit, income (loss) before extraordinary items and cumulative effect of a change in accounting principle and earnings per share data. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a)-(j) -URI http://asc.fasb.org/extlink&oid=51825399&loc=d3e1280-108306 + Details
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