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CONSOLIDATED STATEMENTS OF INCOME (USD $) In Millions, except Per Share data, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
OPERATING REVENUES |  |  |  |  |
Electric Utility | $ 2,453.1 us-gaap_ElectricDomesticRegulatedRevenue |  | $ 2,259.7 us-gaap_ElectricDomesticRegulatedRevenue |  | $ 2,128.7 us-gaap_ElectricDomesticRegulatedRevenue
Natural Gas Midstream Operations (Note 1) | 0 us-gaap_GasGatheringTransportationMarketingAndProcessingRevenue |  | 608.0 us-gaap_GasGatheringTransportationMarketingAndProcessingRevenue |  | 1,542.5 us-gaap_GasGatheringTransportationMarketingAndProcessingRevenue
Total operating revenues | 2,453.1 us-gaap_Revenues |  | 2,867.7 us-gaap_Revenues |  | 3,671.2 us-gaap_Revenues
COST OF SALES |  |  |  |  |
Electric Utility | 1,106.6 us-gaap_CostOfDomesticRegulatedElectric |  | 950.0 us-gaap_CostOfDomesticRegulatedElectric |  | 831.4 us-gaap_CostOfDomesticRegulatedElectric
Natural Gas Midstream Operations (Note 1) | 0 us-gaap_GasGatheringTransportationMarketingAndProcessingCosts |  | 478.9 us-gaap_GasGatheringTransportationMarketingAndProcessingCosts |  | 1,087.3 us-gaap_GasGatheringTransportationMarketingAndProcessingCosts
Total cost of sales | 1,106.6 us-gaap_CostOfGoodsAndServicesSold |  | 1,428.9 us-gaap_CostOfGoodsAndServicesSold |  | 1,918.7 us-gaap_CostOfGoodsAndServicesSold
OPERATING EXPENSES |  |  |  |  |
Other operation and maintenance | 439.6 us-gaap_OtherCostAndExpenseOperating |  | 489.2 us-gaap_OtherCostAndExpenseOperating |  | 601.5 us-gaap_OtherCostAndExpenseOperating
Depreciation and amortization | 281.4 us-gaap_DepreciationAndAmortization |  | 297.3 us-gaap_DepreciationAndAmortization |  | 371.4 us-gaap_DepreciationAndAmortization
Gain on insurance proceeds | 0 us-gaap_GainOnBusinessInterruptionInsuranceRecovery |  | 0 us-gaap_GainOnBusinessInterruptionInsuranceRecovery |  | (7.5)us-gaap_GainOnBusinessInterruptionInsuranceRecovery
Taxes other than income | 88.7 us-gaap_TaxesExcludingIncomeAndExciseTaxes |  | 98.8 us-gaap_TaxesExcludingIncomeAndExciseTaxes |  | 110.2 us-gaap_TaxesExcludingIncomeAndExciseTaxes
Total operating expenses | 809.7 us-gaap_OperatingExpenses |  | 885.3 us-gaap_OperatingExpenses |  | 1,075.6 us-gaap_OperatingExpenses
Operating income (loss) | 536.8 us-gaap_OperatingIncomeLoss |  | 553.5 us-gaap_OperatingIncomeLoss |  | 676.9 us-gaap_OperatingIncomeLoss
OTHER INCOME (EXPENSE) |  |  |  |  |
Equity in earnings of unconsolidated affiliates (Note 1) | 172.6 us-gaap_IncomeLossFromEquityMethodInvestments |  | 101.9 us-gaap_IncomeLossFromEquityMethodInvestments |  | 0 us-gaap_IncomeLossFromEquityMethodInvestments
Allowance for equity funds used during construction | 4.2 us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity |  | 6.6 us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity |  | 6.2 us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity
Other income | 17.8 us-gaap_OtherNonoperatingIncome |  | 31.8 us-gaap_OtherNonoperatingIncome |  | 17.6 us-gaap_OtherNonoperatingIncome
Other expense | (14.4)us-gaap_OtherNonoperatingExpense |  | (22.2)us-gaap_OtherNonoperatingExpense |  | (16.5)us-gaap_OtherNonoperatingExpense
Net other income | 180.2 us-gaap_NonoperatingIncomeExpense |  | 118.1 us-gaap_NonoperatingIncomeExpense |  | 7.3 us-gaap_NonoperatingIncomeExpense
INTEREST EXPENSE |  |  |  |  |
Interest on long-term debt | 144.6 us-gaap_InterestExpenseLongTermDebt |  | 145.6 us-gaap_InterestExpenseLongTermDebt |  | 158.9 us-gaap_InterestExpenseLongTermDebt
Allowance for borrowed funds used during construction | (2.4)us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionAdditions |  | (3.4)us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionAdditions |  | (3.5)us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionAdditions
Interest on short-term debt and other interest charges | 6.2 us-gaap_InterestExpenseShortTermBorrowings |  | 5.3 us-gaap_InterestExpenseShortTermBorrowings |  | 8.7 us-gaap_InterestExpenseShortTermBorrowings
Interest expense | 148.4 us-gaap_InterestExpense |  | 147.5 us-gaap_InterestExpense |  | 164.1 us-gaap_InterestExpense
INCOME BEFORE TAXES | 568.6 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest |  | 524.1 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest |  | 520.1 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
INCOME TAX EXPENSE | 172.8 us-gaap_IncomeTaxExpenseBenefit |  | 130.3 us-gaap_IncomeTaxExpenseBenefit |  | 135.1 us-gaap_IncomeTaxExpenseBenefit
NET INCOME | 395.8 us-gaap_ProfitLoss |  | 393.8 us-gaap_ProfitLoss |  | 385.0 us-gaap_ProfitLoss
Less: Net income attributable to noncontrolling interests | 0 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest |  | 6.2 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest |  | 30.0 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
NET INCOME ATTRIBUTABLE TO OGE ENERGY | $ 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
DILUTED AVERAGE COMMON SHARES OUTSTANDING | 199.9 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding |  | 199.4 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding |  | 198.1 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
BASIC EARNINGS PER AVERAGE COMMON SHARE ATTRIBUTABLE TO OGE ENERGY COMMON SHAREHOLDERS | $ 1.99 us-gaap_EarningsPerShareBasic | [1] | $ 1.96 us-gaap_EarningsPerShareBasic | [1] | $ 1.80 us-gaap_EarningsPerShareBasic
DILUTED EARNINGS PER AVERAGE COMMON SHARES ATTRIBUTABLE TO OGE ENERGY COMMON SHAREHOLDERS | $ 1.98 us-gaap_EarningsPerShareDiluted | [1] | $ 1.94 us-gaap_EarningsPerShareDiluted | [1] | $ 1.79 us-gaap_EarningsPerShareDiluted
DIVIDENDS DECLARED PER COMMON SHARE | $ 0.95 us-gaap_CommonStockDividendsPerShareDeclared |  | $ 0.85125 us-gaap_CommonStockDividendsPerShareDeclared |  | $ 0.7975 us-gaap_CommonStockDividendsPerShareDeclared
[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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