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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2013
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)
2013
2012
Regulatory Assets
 
 
Current
 
 
Fuel clause under recoveries
$
26.2

$
—

Oklahoma demand program rider under recovery (A)
10.6

9.2

Crossroads wind farm rider under recovery (A)
4.7

14.9

Other (A)
7.3

2.9

Total Current Regulatory Assets
$
48.8

$
27.0

Non-Current
 
 
Benefit obligations regulatory asset
$
227.4

$
370.6

Income taxes recoverable from customers, net
56.5

54.7

Smart Grid
44.2

42.8

Deferred storm expenses
21.6

12.7

Unamortized loss on reacquired debt
11.8

13.0

Pension tracker
1.4

—

Other
16.2

16.8

Total Non-Current Regulatory Assets
$
379.1

$
510.6

Regulatory Liabilities
 
 
Current
 
 
Smart Grid rider over recovery (B)
$
16.7

$
24.1

Fuel clause over recoveries
0.4

109.2

Other (B)
3.1

7.8

Total Current Regulatory Liabilities
$
20.2

$
141.1

Non-Current
 
 
Accrued removal obligations, net
$
227.7

$
218.2

Deferred pension credits
6.5

17.7

Pension tracker
—

9.2

Total Non-Current Regulatory Liabilities
$
234.2

$
245.1

(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 at:
December 31 (In millions)
2013
2012
Pension Plan and Restoration of Retirement Income Plan
 
 
Net loss
$
178.4

$
278.6

Prior service cost
2.5

4.5

Postretirement Benefit Plans
 
 
Net loss
79.9

134.6

Prior service cost
(33.4
)
(47.1
)
Total
$
227.4

$
370.6
Schedule of Net Periodic Benefit Cost Not yet Recognized [Table Text Block]
The following amounts in the benefit obligations regulatory asset at December 31, 2013 are expected to be recognized as components of net periodic benefit cost in 2014: 
(In millions)
 
Pension Plan and Restoration of Retirement Income Plan
 
Net loss
$
11.4

Prior service cost
2.0

Postretirement Benefit Plans
 
Net loss
11.0

Prior service cost
(13.7
)
Total
$
10.7
Schedule of Jointly Owned Utility Plants [Table Text Block]
The table below presents 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 Statement of Income.
December 31, 2013 (In millions)
Percentage Ownership
Total Property, Plant and Equipment
Accumulated Depreciation
Net Property, Plant and Equipment
McClain Plant (A)
77
%
$
180.8

$
62.1

$
118.7

Redbud Plant (A)(B)
51
%
$
498.9

$
89.7

$
409.2


(A)
Construction work in progress was $0.1 million and $39.5 million for the McClain and Redbud Plants, respectively.
(B)
This amount includes a plant acquisition adjustment of $148.3 million and accumulated amortization of $28.8 million.

December 31, 2012 (In millions)
Percentage Ownership
Total Property, Plant and Equipment
Accumulated Depreciation
Net Property, Plant and Equipment
McClain Plant (A)
77
%
$
182.1

$
56.3

$
125.8

Redbud Plant (A)(B)
51
%
$
458.5

$
69.5

$
389.0


(A)
Construction work in progress was $0.1 million and $0.3 million for the McClain and Redbud Plants, respectively.
(B)
This amount includes a plant acquisition adjustment of $148.3 million and accumulated amortization of $23.3 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 at: 
December 31, 2013 (In millions)
Total Property, Plant and Equipment    
Accumulated Depreciation
Net Property, Plant and Equipment
OGE Energy (holding company)
 
 
 
Property, plant and equipment
$
152.4

$
114.2

$
38.2

OGE Energy property, plant and equipment
152.4

114.2

38.2

OG&E
 
 
 
Distribution assets
3,403.8

1,028.2

2,375.6

Electric generation assets (A)
3,551.0

1,306.1

2,244.9

Transmission assets (B)
2,163.7

385.0

1,778.7

Intangible plant
50.5

27.1

23.4

Other property and equipment
330.2

118.2

212.0

OG&E property, plant and equipment
9,499.2

2,864.6

6,634.6

Total property, plant and equipment
$
9,651.6

$
2,978.8

$
6,672.8

(A)
This amount includes a plant acquisition adjustment of $148.3 million and accumulated amortization of $28.8 million.
(B)
This amount includes a plant acquisition adjustment of $3.3 million and accumulated amortization of $0.3 million.
December 31, 2012 (In millions)
Total Property, Plant and Equipment    
Accumulated Depreciation
Net Property, Plant and Equipment
OGE Energy (holding company)
 
 
 
Property, plant and equipment
$
142.1

$
103.2

$
38.9

OGE Energy property, plant and equipment
142.1

103.2

38.9

OG&E
 
 
 
Distribution assets
3,222.7

969.6

2,253.1

Electric generation assets (A)
3,446.6

1,242.4

2,204.2

Transmission assets (B)
1,712.6

359.8

1,352.8

Intangible plant
50.2

25.0

25.2

Other property and equipment
317.6

108.8

208.8

OG&E property, plant and equipment
8,749.7

2,705.6

6,044.1

Enogex
 
 
 
Natural gas transportation and storage assets
988.6

292.7

695.9

Natural gas gathering and processing assets
2,011.5

445.6

1,565.9

Enogex property, plant and equipment
3,000.1

738.3

2,261.8

Total property, plant and equipment
$
11,891.9

$
3,547.1

$
8,344.8


(A)
This amount includes a plant acquisition adjustment of $148.3 million and accumulated amortization of $23.3 million.
(B)
This amount includes a plant acquisition adjustment of $3.3 million and accumulated amortization of $0.3 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)
2013
2012
OGE Energy (holding company)
$
7.2

$
11.6

OG&E
16.8

17.6

Enogex
—

3.9

Total
$
24.0

$
33.1
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)
2013
2012
2011
OGE Energy (holding company)
$
6.4

$
6.8

$
6.4

OG&E
4.0

4.2

1.8

Enogex
0.8

3.1

1.0

Total
$
11.2

$
14.1

$
9.2
Schedule of Finite-Lived Intangible Assets [Table Text Block]
The following table below summarizes OGE Holdings' intangible assets and related accumulated amortization at: December 31, 2012.
(In millions)
Total Intangible Assets
Accumulated Amortization
Net Intangible Assets
Customer Contract / Acreage Dedication
$
141.9

$
14.5

$
127.4
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, 2013 and 2012.
(In millions)
2013
2012
Balance at January 1
$
54.0

$
24.8

Liabilities settled (A)
(0.4
)
0.4

Accretion expense
2.3

1.9

Revisions in estimated cash flows (B)
(0.7
)
26.9

Balance at December 31
$
55.2

$
54.0

(A)
As a result of the formation of Enable on May 1, 2013, the Company has no obligations at December 31, 2013 under OGE Holdings' asset retirement obligations previously disclosed in the Company's 2012 10-K.
(B)
Due to changes to OG&E's asset retirement obligations related to its wind farms as a result of changes in the assumption related to the timing of removal used in the valuation of the asset retirement obligations.
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
The following table summarizes changes in the components of accumulated other comprehensive loss attributable to OGE Energy during 2013. All amounts below are presented net of tax and noncontrolling interest.
 
Pension Plan and Restoration of Retirement Income Plan
 
Postretirement Benefit Plans
 
 
 
 
(In millions)
Net loss
Prior service cost
 
Net loss
Prior service cost
Deferred commodity contracts hedging gains
Deferred interest rate swap hedging losses
Less: Noncontrolling interest
Total
Balance at December 31, 2012
$
(49.3
)
$
0.1

 
$
(15.7
)
$
7.2

$
0.1

$
(0.5
)
$
(9.0
)
$
(49.1
)
Other comprehensive income before reclassifications
12.4

—

 
6.9

—

—

—

—

19.3

Amounts reclassified from accumulated other comprehensive income (loss) (A)
6.7

—

 
2.0

(1.8
)
0.6

0.3

0.1

7.7

Deconsolidation of Enogex Holdings
2.8

—

 
1.0

(0.3
)
(0.7
)
—

8.9

(6.1
)
Net current period other comprehensive income (loss)
21.9

—

 
9.9

(2.1
)
(0.1
)
0.3

9.0

20.9

Balance at December 31, 2013
$
(27.4
)
$
0.1

 
$
(5.8
)
$
5.1

$
—

$
(0.2
)
$
—

$
(28.2
)
(A)
Includes $3.0 million of pension settlement charges.
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 year ended December 31, 2013.
Details about Accumulated Other Comprehensive Loss Components
Amount Reclassified from Accumulated Other Comprehensive Loss
Affected Line Item in the Statement Where Net Income is Presented
 
Year Ended
 
(In millions)
December 31, 2013
 
Gains (losses) on cash flow hedges
 
 
Commodity contracts
$
(1.0
)
Cost of sales
Interest rate swap
(0.4
)
Interest expense
 
(1.4
)
Total before tax
 
(0.5
)
Tax benefit
 
$
(0.9
)
Net of tax
 
 
 
Amortization of defined benefit pension items
 
 
Actuarial gains (losses)
$
(6.1
)
(A)
Settlement cost
(4.9
)
(A)
 
(11.0
)
Total before tax
 
(4.3
)
Tax benefit
 
(6.7
)
Net of tax
 
(0.1
)
Noncontrolling interest
 
$
(6.6
)
Net of tax and noncontrolling interest
 
 
 
Amortization of postretirement benefit plan items
 
 
Actuarial gains (losses)
$
(3.3
)
(A)
Prior service cost
2.9

(A)
 
(0.4
)
Total before tax
 
(0.2
)
Tax benefit
 
$
(0.2
)
Net of tax
 
 
 
Total reclassifications for the period
$
(7.7
)
Net of tax and noncontrolling interest
(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 at December 31, 2013 that are expected to be recognized into earnings in 2014 are as follows:
(In millions)
 
Pension Plan and Restoration of Retirement Income Plan
 
Net loss
$
(1.7
)
Prior service cost
(0.1
)
Postretirement Benefit Plans
 
Net loss
(0.8
)
Prior service cost
1.8

Deferred commodity contracts hedging gains
—

Deferred interest rate swap hedging losses
(0.2
)
Total, net of tax
$
(1.0
)