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Quarterly Financial Data (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 12 Months Ended
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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 | 79.7 |  | 243.3 |  | 143.5 |  | 43.8 |  | 82.2 |  | 257.3 |  | 125.9 |  | 37.9 |  | 510.3 |  | 503.3 |  | 481.2
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.

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