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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Schedule of Regulatory Assets and Liabilities [Table Text Block]
The following table is a summary of OG&E's regulatory assets and liabilities.

December 31 (In millions)
20192018
REGULATORY ASSETS  
Current:  
Fuel clause under recoveries$39.5  $2.0  
Production tax credit rider over credit (A)1.7  6.9  
Oklahoma demand program rider under recovery (A)—  6.4  
Other (A)7.5  3.2  
Total current regulatory assets$48.7  $18.5  
Non-current:
Benefit obligations regulatory asset$167.2  $188.2  
Deferred storm expenses65.5  36.5  
Sooner Dry Scrubbers20.6  4.5  
Smart Grid18.4  25.6  
Unamortized loss on reacquired debt10.6  11.4  
Arkansas deferred pension expenses8.0  6.8  
Pension tracker2.3  —  
Other13.4  12.8  
Total non-current regulatory assets$306.0  $285.8  
REGULATORY LIABILITIES
Current:
Reserve for tax refund and interim surcharge (B)$12.7  $15.4  
Fuel clause over recoveries4.8  0.3  
SPP cost tracker over recovery (B)2.6  16.8  
Oklahoma demand program rider over recovery (B)2.0  —  
Transmission cost recovery rider over recovery (B)—  2.7  
Other (B)6.9  1.4  
Total current regulatory liabilities$29.0  $36.6  
Non-current:
Income taxes refundable to customers, net$899.2  $937.1  
Accrued removal obligations, net318.5  308.1  
Pension tracker—  18.7  
Other5.8  6.8  
Total non-current regulatory liabilities$1,223.5  $1,270.7  
(A)Included in Other Current Assets in the Consolidated Balance Sheets.
(B)Included in Other Current Liabilities in the Consolidated Balance Sheets.
Components of Benefit Obligation Regulatory Asset [Table Text Block]
The following table is a summary of the components of the benefit obligations regulatory asset:
December 31 (In millions)
20192018
Pension Plan and Restoration of Retirement Income Plan:
Net loss$160.5  $185.3  
Postretirement Benefit Plans:   
Net loss23.3  25.6  
Prior service cost(16.6) (22.7) 
Total$167.2  $188.2  
Schedule of Net Periodic Benefit Cost Not yet Recognized [Table Text Block]
The following amounts in the benefit obligations regulatory asset at December 31, 2019 are expected to be recognized as components of net periodic benefit cost in 2020: 
(In millions)
Pension Plan and Restoration of Retirement Income Plan: 
Net loss$11.4  
Postretirement Benefit Plans:   
Net loss2.8  
Prior service cost(6.1) 
Total$8.1  
Schedule of Jointly Owned Utility Plants [Table Text Block]
The tables below present OG&E's ownership interest in the jointly-owned McClain Plant and the jointly-owned Redbud Plant, and, as disclosed below, only OG&E's ownership interest is reflected in the property, plant and equipment and accumulated depreciation balances in these tables. The owners of the remaining interests in the McClain Plant and the Redbud Plant are responsible for providing their own financing of capital expenditures. Also, only OG&E's proportionate interests of any direct expenses of the McClain Plant and the Redbud Plant, such as fuel, maintenance expense and other operating expenses, are included in the applicable financial statement captions in the Consolidated Statements of Income.

December 31, 2019 (In millions)
Percentage OwnershipTotal Property, Plant and EquipmentAccumulated DepreciationNet Property, Plant and Equipment
McClain Plant (A)77 %$254.4  $83.5  $170.9  
Redbud Plant (A)(B)51 %$529.9  $159.0  $370.9  
(A)Construction work in progress was $0.2 million and $1.4 million for the McClain and Redbud Plants, respectively.
(B)This amount includes a plant acquisition adjustment of $148.3 million and accumulated amortization of $61.8 million.

December 31, 2018 (In millions)
Percentage OwnershipTotal Property, Plant and EquipmentAccumulated DepreciationNet Property, Plant and Equipment
McClain Plant (A)77 %$227.2  $78.2  $149.0  
Redbud Plant (A)(B)51 %$493.9  $145.3  $348.6  
(A)Construction work in progress was $0.2 million and $0.9 million for the McClain and Redbud Plants, respectively.
(B)This amount includes a plant acquisition adjustment of $148.3 million and accumulated amortization of $56.3 million.
Property, Plant and Equipment [Table Text Block]
The Company's property, plant and equipment and related accumulated depreciation are divided into the following major classes: 
December 31, 2019 (In millions)
Total Property, Plant and Equipment    Accumulated DepreciationNet Property, Plant and Equipment
OGE Energy:
Property, plant and equipment$6.1  $—  $6.1  
OGE Energy property, plant and equipment6.1  —  6.1  
OG&E:
Distribution assets4,468.6  1,381.1  3,087.5  
Electric generation assets (A)4,838.6  1,601.0  3,237.6  
Transmission assets (B)2,901.1  565.5  2,335.6  
Intangible plant225.2  145.4  79.8  
Other property and equipment473.1  175.1  298.0  
OG&E property, plant and equipment12,906.6  3,868.1  9,038.5  
Total property, plant and equipment$12,912.7  $3,868.1  $9,044.6  
(A)This amount includes a plant acquisition adjustment of $148.3 million and accumulated amortization of $61.8 million.
(B)This amount includes a plant acquisition adjustment of $3.3 million and accumulated amortization of $0.8 million.

December 31, 2018 (In millions)
Total Property, Plant and Equipment    Accumulated DepreciationNet Property, Plant and Equipment
OGE Energy:
Property, plant and equipment$6.1  $—  $6.1  
OGE Energy property, plant and equipment6.1  —  6.1  
OG&E:
Distribution assets4,229.4  1,324.5  2,904.9  
Electric generation assets (A)4,657.2  1,572.8  3,084.4  
Transmission assets (B)2,846.7  534.2  2,312.5  
Intangible plant187.6  135.1  52.5  
Other property and equipment444.2  160.8  283.4  
OG&E property, plant and equipment12,365.1  3,727.4  8,637.7  
Total property, plant and equipment$12,371.2  $3,727.4  $8,643.8  
(A)This amount includes a plant acquisition adjustment of $148.3 million and accumulated amortization of $56.3 million.
(B)This amount includes a plant acquisition adjustment of $3.3 million and accumulated amortization of $0.7 million.
Schedule of Computer Software Costs, Amortization [Table Text Block]
The following table summarizes the Company's amortization expense for computer software costs.
Year Ended December 31 (In millions)
201920182017
OGE Energy$—  $—  $0.2  
OG&E11.0  9.6  8.8  
Total$11.0  $9.6  $9.0  
Schedule of Change in Asset Retirement Obligation [Table Text Block]
The following table summarizes changes to the Company's asset retirement obligations during the years ended December 31, 2019 and 2018.
(In millions)20192018
Balance at January 1$83.9  $75.1  
Accretion expense1.0  3.4  
Revisions in estimated cash flows (A)(2.4) 6.8  
Liabilities settled (B)(9.0) (1.4) 
Balance at December 31$73.5  $83.9  
(A)Assumptions changed related to the estimated cost of the removal of wind turbine assets and asbestos removal at OG&E's generating facilities.
(B)Asset retirement obligations were settled for asbestos removal and for the closure of an ash pond at OG&E's generating facilities.
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
The following tables summarize changes in the components of accumulated other comprehensive income (loss) attributable to the Company during 2018 and 2019. All amounts below are presented net of tax.
Pension Plan and Restoration of Retirement Income PlanPostretirement Benefit Plans
(In millions)Net Gain
 (Loss)		Net Gain (Loss)Prior Service Cost (Credit)Other Comprehensive Loss from Unconsolidated AffiliatesTotal
Balance at December 31, 2017$(32.7) $2.5  $7.0  $—  $(23.2) 
Other comprehensive income (loss) before reclassifications(14.1) 2.1  —  —  (12.0) 
Amounts reclassified from accumulated other comprehensive income (loss)3.3  —  (1.7) —  1.6  
Settlement cost4.7  —  —  —  4.7  
Net current period other comprehensive income (loss)(6.1) 2.1  (1.7) —  (5.7) 
Balance at December 31, 2018(38.8) 4.6  5.3  —  (28.9) 
Other comprehensive income (loss) before reclassifications(8.3) (0.2) —  (0.6) (9.1) 
Amounts reclassified from accumulated other comprehensive income (loss)3.4  (0.2) (1.7) —  1.5  
Settlement cost8.6  —  —  —  8.6  
Net current period other comprehensive income (loss)3.7  (0.4) (1.7) (0.6) 1.0  
Balance at December 31, 2019$(35.1) $4.2  $3.6  $(0.6) $(27.9) 
Reclassification out of Accumulated Other Comprehensive Income [Table Text Block]
The following table summarizes significant amounts reclassified out of accumulated other comprehensive income (loss) by the respective line items in net income during the years ended December 31, 2019 and 2018.
Details about Accumulated Other Comprehensive Income (Loss) ComponentsAmount Reclassified from Accumulated Other Comprehensive Income (Loss)Affected Line Item in the Consolidated Statements of Income
Year Ended December 31,
(In millions)20192018
Amortization of Pension Plan and Restoration of Retirement Income Plan items:
Actuarial losses$(4.5) $(4.4) (A)
Settlement cost(11.3) (6.3) (A)
(15.8) (10.7) Income Before Taxes
(3.8) (2.7) Income Tax Expense
$(12.0) $(8.0) Net Income
Amortization of postretirement benefit plans items:
Prior service credit$2.3  $2.3  (A)
Actuarial gains0.2  —  (A)
2.5  2.3  Income Before Taxes
0.6  0.6  Income Tax Expense
$1.9  $1.7  Net Income
Total reclassifications for the period, net of tax$(10.1) $(6.3) Net Income
(A)These accumulated other comprehensive income (loss) components are included in the computation of net periodic benefit cost (see Note 13 for additional information).
Schedule of Amounts in Accumulated Other Comprehensive Income (Loss) to be Recognized over Next Fiscal Year [Table Text Block]
The amounts in accumulated other comprehensive loss (gain) at December 31, 2019 that are expected to be recognized into earnings in 2020 are as follows:
(In millions) 
Pension Plan and Restoration of Retirement Income Plan: 
Net gain$(4.2) 
Postretirement Benefit Plans:   
Net loss0.2  
Prior service cost2.3  
Total, net of tax$(1.7)