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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2016
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 at:
December 31 (In millions)
2016
2015
Regulatory Assets
 
 
Current
 
 
Fuel clause under recoveries
$
51.3

$
—

Oklahoma demand program rider under recovery (A)
51.0

36.6

SPP cost tracker under recovery (A)
10.0

4.5

Other (A)
9.5

5.4

Total Current Regulatory Assets
$
121.8

$
46.5

Non-Current
 
 
Benefit obligations regulatory asset
$
232.6

$
242.2

Income taxes recoverable from customers, net
62.3

56.7

Smart Grid
43.2

43.6

Deferred storm expenses
35.7

27.6

Unamortized loss on reacquired debt
13.4

14.8

Other
17.6

17.3

Total Non-Current Regulatory Assets
$
404.8

$
402.2

Regulatory Liabilities
 
 
Current
 
 
Fuel clause over recoveries
$
—

$
61.3

Other (B)
12.3

7.5

Total Current Regulatory Liabilities
$
12.3

$
68.8

Non-Current
 
 
Accrued removal obligations, net
$
262.8

$
254.9

Pension tracker
35.5

17.7

Other (C)
1.4

1.0

Total Non-Current Regulatory Liabilities
$
299.7

$
273.6

(A)
Included in Other Current Assets on the Consolidated Balance Sheets.
(B)
Included in Other Current Liabilities on the Consolidated Balance Sheets.
(C)
Prior year amount of $1.0 million reclassified from Deferred Other Liabilities to Non-Current Regulatory Liabilities.
Components of Benefit Obligation Regulatory Asset [Table Text Block]
The following table is a summary of the components of the benefit obligations regulatory asset at:
December 31 (In millions)
2016
2015
Pension Plan and Restoration of Retirement Income Plan
 
 
Net loss
$
199.9

$
214.1

Postretirement Benefit Plans
 
 
Net loss
32.7

34.2

Prior service cost
—

(6.1
)
Total
$
232.6

$
242.2
Schedule of Net Periodic Benefit Cost Not yet Recognized [Table Text Block]
The following amounts in the benefit obligations regulatory asset at December 31, 2016 are expected to be recognized as components of net periodic benefit cost in 2017: 
(In millions)
 
Pension Plan and Restoration of Retirement Income Plan
 
Net loss
$
12.4

Postretirement Benefit Plans
 
Net loss
2.3

Total
$
14.7
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, 2016 (In millions)
Percentage Ownership
Total Property, Plant and Equipment
Accumulated Depreciation
Net Property, Plant and Equipment
McClain Plant (A)
77
%
$
234.2

$
72.3

$
161.9

Redbud Plant (A)(B)
51
%
$
489.0

$
121.0

$
368.0


(A)
Construction work in progress was $0.2 million and $1.8 million for the McClain and Redbud Plants, respectively.
(B)
This amount includes a plant acquisition adjustment of $148.3 million and accumulated amortization of $45.3 million.

December 31, 2015 (In millions)
Percentage Ownership
Total Property, Plant and Equipment
Accumulated Depreciation
Net Property, Plant and Equipment
McClain Plant (A)
77
%
$
220.4

$
62.8

$
157.6

Redbud Plant (A)(B)
51
%
$
487.5

$
101.2

$
386.3


(A)
Construction work in progress was $1.6 million and $1.3 million for the McClain and Redbud Plants, respectively.
(B)
This amount includes a plant acquisition adjustment of $148.3 million and accumulated amortization of $39.8 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 at: 
December 31, 2016 (In millions)
Total Property, Plant and Equipment    
Accumulated Depreciation
Net Property, Plant and Equipment
OGE Energy (holding company)
 
 
 
Property, plant and equipment
$
117.7

$
103.3

$
14.4

OGE Energy property, plant and equipment
117.7

103.3

14.4

OG&E
 
 
 
Distribution assets
3,896.2

1,221.5

2,674.7

Electric generation assets (A)
4,155.9

1,493.3

2,662.6

Transmission assets (B)
2,548.8

481.3

2,067.5

Intangible plant
85.0

43.9

41.1

Other property and equipment
381.5

145.6

235.9

OG&E property, plant and equipment
11,067.4

3,385.6

7,681.8

Total property, plant and equipment
$
11,185.1

$
3,488.9

$
7,696.2

(A)
This amount includes a plant acquisition adjustment of $148.3 million and accumulated amortization of $45.3 million.
(B)
This amount includes a plant acquisition adjustment of $3.3 million and accumulated amortization of $0.6 million.
December 31, 2015 (In millions)
Total Property, Plant and Equipment    
Accumulated Depreciation
Net Property, Plant and Equipment
OGE Energy (holding company)
 
 
 
Property, plant and equipment
$
139.0

$
112.7

$
26.3

OGE Energy property, plant and equipment
139.0

112.7

26.3

OG&E
 
 
 
Distribution assets
3,728.8

1,152.8

2,576.0

Electric generation assets (A)
3,837.4

1,407.0

2,430.4

Transmission assets (B)
2,454.2

440.7

2,013.5

Intangible plant
81.0

38.0

43.0

Other property and equipment
356.4

123.2

233.2

OG&E property, plant and equipment
10,457.8

3,161.7

7,296.1

Total property, plant and equipment
$
10,596.8

$
3,274.4

$
7,322.4


(A)
This amount includes a plant acquisition adjustment of $148.3 million and accumulated amortization of $39.8 million.
(B)
This amount includes a plant acquisition adjustment of $3.3 million and accumulated amortization of $0.5 million.
Schedule of Unamortized Computer Software Costs [Table Text Block]
The following table summarizes the Company's unamortized computer software costs.
December 31 (In millions)
2016
2015
OGE Energy (holding company)
$
1.0

$
2.4

OG&E
36.5

34.3

Total
$
37.5

$
36.7
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)
2016
2015
2014
OGE Energy (holding company)
$
1.4

$
2.0

$
4.3

OG&E
8.0

6.9

5.2

Total
$
9.4

$
8.9

$
9.5
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, 2016 and 2015.
(In millions)
2016
2015
Balance at January 1
$
63.3

$
58.6

Accretion expense
2.8

2.6

Revisions in estimated cash flows (A)
3.6

1.6

Additions
—

0.9

Liabilities settled
(0.1
)
(0.4
)
Balance at December 31
$
69.6

$
63.3


(A)
Assumptions changed related to the estimated cost of asbestos abatement.
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 OGE Energy during 2015 and 2016. 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
 
Net income (loss)
Prior service cost
Total
Balance at December 31, 2014
$
(36.8
)
$
0.1

 
$
(8.0
)
$
3.3

$
(41.4
)
Other comprehensive income (loss) before reclassifications
(9.5
)
—

 
9.3

—

(0.2
)
Amounts reclassified from accumulated other comprehensive income (loss)
2.5

—

 
1.2

(1.8
)
1.9

Settlement cost
4.6

—

 
—

—

4.6

Net current period other comprehensive income (loss)
(2.4
)
—

 
10.5

(1.8
)
6.3

Balance at December 31, 2015
(39.2
)
0.1

 
2.5

1.5

(35.1
)
Other comprehensive income (loss) before reclassifications
(0.7
)
—

 
0.2

—

(0.5
)
Amounts reclassified from accumulated other comprehensive income (loss)
2.8

—

 
—

(1.5
)
1.3

Settlement cost
5.0

—

 
—

—

5.0

Net current period other comprehensive income (loss)
7.1

—

 
0.2

(1.5
)
5.8

Balance at December 31, 2016
$
(32.1
)
$
0.1

 
$
2.7

$
—

$
(29.3
)
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, 2016 and 2015.
Details about Accumulated Other Comprehensive Income (Loss) Components
Amount Reclassified from Accumulated Other Comprehensive Income (Loss)
Affected Line Item in the Statement Where Net Income is Presented
 
Year Ended December 31,
 
(In millions)
2016
2015
 
Amortization of defined benefit pension and restoration of retirement income plan items
 
 
 
Actuarial losses
$
(4.5
)
$
(4.7
)
(A)
Settlement
(8.2
)
(7.5
)
(A)
 
(12.7
)
(12.2
)
Total before tax
 
(4.9
)
(5.1
)
Tax benefit
 
$
(7.8
)
$
(7.1
)
Net of tax
 
 
 
 
Amortization of postretirement benefit plan items
 
 
 
Actuarial losses
$
—

$
(2.0
)
(A)
Prior service cost
2.5

2.9

(A)
 
2.5

0.9

Total before tax
 
1.0

0.3

Tax expense
 
$
1.5

$
0.6

Net of tax
 
 
 
 
Total reclassifications for the period
$
(6.3
)
$
(6.5
)
Net of tax
(A)
These accumulated other comprehensive income (loss) components are included in the computation of net periodic benefit cost (see Note 11 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 at December 31, 2016 that are expected to be recognized into earnings in 2017 are as follows:
(In millions)
 
Pension Plan and Restoration of Retirement Income Plan
 
Net loss
$
(3.9
)
Postretirement Benefit Plans
 
Net loss
—

Prior service cost
—

Total, net of tax
$
(3.9
)