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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2018
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)
2018
2017
REGULATORY ASSETS
 
 
Current:
 
 
Production tax credit rider under recovery (A)
$
6.9

$
—

Oklahoma demand program rider under recovery (A)
6.4

31.6

Fuel clause under recoveries
2.0

—

SPP cost tracker under recovery (A)
—

7.7

Other (A)
3.2

1.5

Total current regulatory assets
$
18.5

$
40.8

Non-current:
 
 
Benefit obligations regulatory asset
$
188.2

$
177.2

Deferred storm expenses
36.5

42.2

Smart Grid
25.6

32.8

Unamortized loss on reacquired debt
11.4

12.3

Arkansas deferred pension expenses
6.8

5.1

Sooner Dry Scrubbers
4.5

—

Other
12.8

13.4

Total non-current regulatory assets
$
285.8

$
283.0

REGULATORY LIABILITIES
 
 
Current:
 
 
SPP cost tracker over recovery (B)
$
16.8

$
—

Reserve for tax refund (B)
15.4

—

Transmission cost recovery rider over recovery (B)
2.7

0.2

Fuel clause over recoveries
0.3

1.7

Other (B)
1.4

2.0

Total current regulatory liabilities
$
36.6

$
3.9

Non-current:
 
 
Income taxes refundable to customers, net
$
937.1

$
955.5

Accrued removal obligations, net
308.1

288.4

Pension tracker
18.7

32.3

Other
6.8

7.2

Total non-current regulatory liabilities
$
1,270.7

$
1,283.4

(A)
Included in Other Current Assets on the Consolidated Balance Sheets.
(B)
Included in Other Current Liabilities on 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)
2018
2017
Pension Plan and Restoration of Retirement Income Plan:
 
 
Net loss
$
185.3

$
172.4

Postretirement Benefit Plans:
 
 
Net loss
25.6

33.6

Prior service cost
(22.7
)
(28.8
)
Total
$
188.2

$
177.2
Schedule of Net Periodic Benefit Cost Not yet Recognized [Table Text Block]
The following amounts in the benefit obligations regulatory asset at December 31, 2018 are expected to be recognized as components of net periodic benefit cost in 2019: 
(In millions)
 
Pension Plan and Restoration of Retirement Income Plan:
 
Net loss
$
13.8

Postretirement Benefit Plans:
 
Net loss
2.7

Prior service cost
(6.1
)
Total
$
10.4
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, 2018 (In millions)
Percentage Ownership
Total Property, Plant and Equipment
Accumulated Depreciation
Net 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.

December 31, 2017 (In millions)
Percentage Ownership
Total Property, Plant and Equipment
Accumulated Depreciation
Net Property, Plant and Equipment
McClain Plant (A)
77
%
$
226.8

$
71.4

$
155.4

Redbud Plant (A)(B)
51
%
$
496.6

$
136.0

$
360.6


(A)
Construction work in progress was $0.4 million and $7.8 million for the McClain and Redbud Plants, respectively.
(B)
This amount includes a plant acquisition adjustment of $148.3 million and accumulated amortization of $50.8 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, 2018 (In millions)
Total Property, Plant and Equipment    
Accumulated Depreciation
Net Property, Plant and Equipment
OGE Energy:
 
 
 
Property, plant and equipment
$
6.1

$
—

$
6.1

OGE Energy property, plant and equipment
6.1

—

6.1

OG&E:
 
 
 
Distribution assets
4,229.4

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 plant
187.6

135.1

52.5

Other property and equipment
444.2

160.8

283.4

OG&E property, plant and equipment
12,365.1

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.

December 31, 2017 (In millions)
Total Property, Plant and Equipment    
Accumulated Depreciation
Net Property, Plant and Equipment
OGE Energy:
 
 
 
Property, plant and equipment
$
6.1

$
—

$
6.1

OGE Energy property, plant and equipment
6.1

—

6.1

OG&E:
 
 
 
Distribution assets
4,057.1

1,259.1

2,798.0

Electric generation assets (A)
4,475.0

1,493.5

2,981.5

Transmission assets (B)
2,767.7

506.5

2,261.2

Intangible plant
181.8

135.8

46.0

Other property and equipment
421.0

173.9

247.1

OG&E property, plant and equipment
11,902.6

3,568.8

8,333.8

Total property, plant and equipment
$
11,908.7

$
3,568.8

$
8,339.9


(A)
This amount includes a plant acquisition adjustment of $148.3 million and accumulated amortization of $50.8 million.
(B)
This amount includes a plant acquisition adjustment of $3.3 million and accumulated amortization of $0.6 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)
2018
2017
2016
OGE Energy
$
—

$
0.2

$
1.4

OG&E
9.6

8.8

8.0

Total
$
9.6

$
9.0

$
9.4
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, 2018 and 2017.
(In millions)
2018
2017
Balance at January 1
$
75.1

$
69.6

Accretion expense
3.4

3.1

Revisions in estimated cash flows (A)
6.8

2.4

Liabilities settled
(1.4
)
—

Balance at December 31
$
83.9

$
75.1


(A)
Assumptions changed related to the estimated timing and estimated cost of ash pond removal at one of 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 loss attributable to the Company during 2017 and 2018. All amounts below are presented net of tax.
 
Pension Plan and Restoration of Retirement Income Plan
Postretirement Benefit Plans
 
(In millions)
Net Income
 (Loss)
Prior Service Cost (Credit)
Net Income (Loss)
Prior Service Cost (Credit)
Total
Balance at December 31, 2016
$
(32.1
)
$
0.1

$
2.7

$
—

$
(29.3
)
Other comprehensive income (loss) before reclassifications
0.4

—

(0.6
)
6.3

6.1

Amounts reclassified from accumulated other comprehensive income (loss)
2.5

(0.1
)
—

(0.6
)
1.8

Cumulative effect of change in accounting principle
(5.7
)
—

(0.1
)
1.3

(4.5
)
Settlement cost
2.2

—

0.5

—

2.7

Net current period other comprehensive income
(0.6
)
(0.1
)
(0.2
)
7.0

6.1

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 cost
4.7

—

—

—

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
)
Reclassification out of Accumulated Other Comprehensive Income [Table Text Block]
The following table summarizes significant amounts reclassified out of accumulated other comprehensive loss by the respective line items in net income during the years ended December 31, 2018 and 2017.
Details about Accumulated Other Comprehensive Income (Loss) Components
Amount Reclassified from Accumulated Other Comprehensive Income (Loss)
Affected Line Item in the Consolidated Statements of Income
 
Year Ended December 31,
 
(In millions)
2018
2017
 
Amortization of Pension Plan and Restoration of Retirement Income Plan items:
 
 
 
Actuarial losses (A)
$
(4.4
)
$
(3.9
)
Other Net Periodic Benefit Expense
Prior service cost
—

0.1

Other Net Periodic Benefit Expense
Settlement cost (A)
(6.3
)
(3.6
)
Other Net Periodic Benefit Expense
 
(10.7
)
(7.4
)
Income Before Taxes
 
(2.7
)
(2.8
)
Income Tax Expense (Benefit)
 
$
(8.0
)
$
(4.6
)
Net Income
 
 
 
 
Amortization of postretirement benefit plans items:
 
 
 
Prior service cost
$
2.3

$
0.9

Other Net Periodic Benefit Expense
Settlement cost (A)
—

(0.7
)
Other Net Periodic Benefit Expense
 
2.3

0.2

Income Before Taxes
 
0.6

0.1

Income Tax Expense (Benefit)
 
$
1.7

$
0.1

Net Income
 
 
 
 
Total reclassifications for the period
$
(6.3
)
$
(4.5
)
Net Income
(A)
These accumulated other comprehensive loss components are included in the computation of net periodic benefit cost (see Note 12 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, 2018 that are expected to be recognized into earnings in 2019 are as follows:
(In millions)
 
Pension Plan and Restoration of Retirement Income Plan:
 
Net gain
$
(4.9
)
Postretirement Benefit Plans:
 
Net loss
0.3

Prior service cost
2.3

Total, net of tax
$
(2.3
)