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Quarterly Financial Data (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Operating revenues $ 501.9 $ 716.8 $ 586.4 $ 456.0 $ 530.8 $ 743.9 $ 551.4 $ 433.1 $ 2,261.1 $ 2,259.2 $ 2,196.9
Operating income 95.0 244.5 145.8 45.7 81.3 258.0 135.2 38.5 531.0 513.0 506.1
Net income $ 294.8 $ 183.4 $ 104.8 $ 36.0 $ 57.9 $ 183.6 $ 71.5 $ 25.2 $ 619.0 $ 338.2 $ 271.3
Basic earnings per average common share attributable to OGE Energy common shareholders $ 1.48 [1] $ 0.92 [1] $ 0.52 [1] $ 0.18 [1] $ 0.29 [1] $ 0.92 [1] $ 0.35 [1] $ 0.13 [1] $ 3.10 [1] $ 1.69 [1] $ 1.36
Diluted earnings per average common share attributable to OGE Energy common shareholders $ 1.48 [1] $ 0.92 [1] $ 0.52 [1] $ 0.18 [1] $ 0.29 [1] $ 0.92 [1] $ 0.35 [1] $ 0.13 [1] $ 3.10 [1] $ 1.69 [1] $ 1.36
[1] Due to the impact of dilution on the earnings per share calculation, quarterly earnings per share amounts may not add to the total.