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Quarterly Financial Data (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Operating revenues $ 526.2us-gaap_Revenues $ 754.7us-gaap_Revenues $ 611.8us-gaap_Revenues $ 560.4us-gaap_Revenues $ 508.9us-gaap_Revenues $ 723.2us-gaap_Revenues $ 734.2us-gaap_Revenues $ 901.4us-gaap_Revenues $ 2,453.1us-gaap_Revenues $ 2,867.7us-gaap_Revenues $ 3,671.2us-gaap_Revenues
Operating income 85.1us-gaap_OperatingIncomeLoss 248.1us-gaap_OperatingIncomeLoss 141.8us-gaap_OperatingIncomeLoss 61.8us-gaap_OperatingIncomeLoss 73.3us-gaap_OperatingIncomeLoss 260.9us-gaap_OperatingIncomeLoss 143.9us-gaap_OperatingIncomeLoss 75.4us-gaap_OperatingIncomeLoss 536.8us-gaap_OperatingIncomeLoss 553.5us-gaap_OperatingIncomeLoss 676.9us-gaap_OperatingIncomeLoss
Net income 58.4us-gaap_ProfitLoss 187.3us-gaap_ProfitLoss 100.8us-gaap_ProfitLoss 49.3us-gaap_ProfitLoss 57.6us-gaap_ProfitLoss 215.2us-gaap_ProfitLoss 93.0us-gaap_ProfitLoss 28.0us-gaap_ProfitLoss 395.8us-gaap_ProfitLoss 393.8us-gaap_ProfitLoss 385.0us-gaap_ProfitLoss
Net income attributable to OGE Energy $ 58.4us-gaap_NetIncomeLoss $ 187.3us-gaap_NetIncomeLoss $ 100.8us-gaap_NetIncomeLoss $ 49.3us-gaap_NetIncomeLoss $ 57.6us-gaap_NetIncomeLoss $ 215.2us-gaap_NetIncomeLoss $ 91.7us-gaap_NetIncomeLoss $ 23.1us-gaap_NetIncomeLoss $ 395.8us-gaap_NetIncomeLoss $ 387.6us-gaap_NetIncomeLoss $ 355.0us-gaap_NetIncomeLoss
Basic earnings per average common share attributable to OGE Energy common shareholders $ 0.29us-gaap_EarningsPerShareBasic [1] $ 0.94us-gaap_EarningsPerShareBasic [1] $ 0.51us-gaap_EarningsPerShareBasic [1] $ 0.25us-gaap_EarningsPerShareBasic [1] $ 0.29us-gaap_EarningsPerShareBasic [1] $ 1.08us-gaap_EarningsPerShareBasic [1] $ 0.46us-gaap_EarningsPerShareBasic [1] $ 0.12us-gaap_EarningsPerShareBasic [1] $ 1.99us-gaap_EarningsPerShareBasic [1] $ 1.96us-gaap_EarningsPerShareBasic [1] $ 1.80us-gaap_EarningsPerShareBasic
Diluted earnings per average common share attributable to OGE Energy common shareholders $ 0.29us-gaap_EarningsPerShareDiluted [1] $ 0.94us-gaap_EarningsPerShareDiluted [1] $ 0.50us-gaap_EarningsPerShareDiluted [1] $ 0.25us-gaap_EarningsPerShareDiluted [1] $ 0.29us-gaap_EarningsPerShareDiluted [1] $ 1.08us-gaap_EarningsPerShareDiluted [1] $ 0.46us-gaap_EarningsPerShareDiluted [1] $ 0.12us-gaap_EarningsPerShareDiluted [1] $ 1.98us-gaap_EarningsPerShareDiluted [1] $ 1.94us-gaap_EarningsPerShareDiluted [1] $ 1.79us-gaap_EarningsPerShareDiluted
[1] Due to the impact of dilution on the earnings per share calculation, quarterly earnings per share amounts may not add to the total.