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Common Equity Earnings Per Share (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
Net income attributable to OGE Energy | $ 58.4 us-gaap_NetIncomeLoss |  | $ 187.3 us-gaap_NetIncomeLoss |  | $ 100.8 us-gaap_NetIncomeLoss |  | $ 49.3 us-gaap_NetIncomeLoss |  | $ 57.6 us-gaap_NetIncomeLoss |  | $ 215.2 us-gaap_NetIncomeLoss |  | $ 91.7 us-gaap_NetIncomeLoss |  | $ 23.1 us-gaap_NetIncomeLoss |  | $ 395.8 us-gaap_NetIncomeLoss |  | $ 387.6 us-gaap_NetIncomeLoss |  | $ 355.0 us-gaap_NetIncomeLoss
Basic Average Common Shares Outstanding |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 199.2 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic |  | 198.2 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic |  | 197.1 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Contingently Issuable Shares (Performance Units) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.7 us-gaap_IncrementalCommonSharesAttributableToContingentlyIssuableShares |  | 1.2 us-gaap_IncrementalCommonSharesAttributableToContingentlyIssuableShares |  | 1.0 us-gaap_IncrementalCommonSharesAttributableToContingentlyIssuableShares
Diluted Average Common Shares Outstanding |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 199.9 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding |  | 199.4 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding |  | 198.1 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Earnings Per Share, Basic and Diluted [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic earnings per average common share attributable to OGE Energy common shareholders | $ 0.29 us-gaap_EarningsPerShareBasic | [1] | $ 0.94 us-gaap_EarningsPerShareBasic | [1] | $ 0.51 us-gaap_EarningsPerShareBasic | [1] | $ 0.25 us-gaap_EarningsPerShareBasic | [1] | $ 0.29 us-gaap_EarningsPerShareBasic | [1] | $ 1.08 us-gaap_EarningsPerShareBasic | [1] | $ 0.46 us-gaap_EarningsPerShareBasic | [1] | $ 0.12 us-gaap_EarningsPerShareBasic | [1] | $ 1.99 us-gaap_EarningsPerShareBasic | [1] | $ 1.96 us-gaap_EarningsPerShareBasic | [1] | $ 1.80 us-gaap_EarningsPerShareBasic
Diluted earnings per average common share attributable to OGE Energy common shareholders | $ 0.29 us-gaap_EarningsPerShareDiluted | [1] | $ 0.94 us-gaap_EarningsPerShareDiluted | [1] | $ 0.50 us-gaap_EarningsPerShareDiluted | [1] | $ 0.25 us-gaap_EarningsPerShareDiluted | [1] | $ 0.29 us-gaap_EarningsPerShareDiluted | [1] | $ 1.08 us-gaap_EarningsPerShareDiluted | [1] | $ 0.46 us-gaap_EarningsPerShareDiluted | [1] | $ 0.12 us-gaap_EarningsPerShareDiluted | [1] | $ 1.98 us-gaap_EarningsPerShareDiluted | [1] | $ 1.94 us-gaap_EarningsPerShareDiluted | [1] | $ 1.79 us-gaap_EarningsPerShareDiluted
OGE Energy [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ratio of Consolidated Debt to Consolidated Capitalization | 65.00%oge_RatioofConsolidatedDebttoConsolidatedCapitalization / dei_LegalEntityAxis = oge_OgeEnergyMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 65.00%oge_RatioofConsolidatedDebttoConsolidatedCapitalization / dei_LegalEntityAxis = oge_OgeEnergyMember |  |  |  |
Retained Earnings, Restricted | 452.6 oge_RetainedEarningsRestricted / dei_LegalEntityAxis = oge_OgeEnergyMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 452.6 oge_RetainedEarningsRestricted / dei_LegalEntityAxis = oge_OgeEnergyMember |  |  |  |
Retained Earnings, Unrestricted | 1,700.0 oge_RetainedEarningsUnrestricted / dei_LegalEntityAxis = oge_OgeEnergyMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,700.0 oge_RetainedEarningsUnrestricted / dei_LegalEntityAxis = oge_OgeEnergyMember |  |  |  |
Og and E [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ratio of Consolidated Debt to Consolidated Capitalization | 65.00%oge_RatioofConsolidatedDebttoConsolidatedCapitalization / dei_LegalEntityAxis = oge_OgAndEMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 65.00%oge_RatioofConsolidatedDebttoConsolidatedCapitalization / dei_LegalEntityAxis = oge_OgAndEMember |  |  |  |
Retained Earnings, Restricted | 412.2 oge_RetainedEarningsRestricted / dei_LegalEntityAxis = oge_OgAndEMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 412.2 oge_RetainedEarningsRestricted / dei_LegalEntityAxis = oge_OgAndEMember |  |  |  |
Retained Earnings, Unrestricted | $ 1,600.0 oge_RetainedEarningsUnrestricted / dei_LegalEntityAxis = oge_OgAndEMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,600.0 oge_RetainedEarningsUnrestricted / dei_LegalEntityAxis = oge_OgAndEMember |  |  |  |
[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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