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Summary of Significant Accounting Policies (Tables)
 3 Months Ended
Mar. 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:
(In millions)
March 31, 2013
December 31, 2012
Regulatory Assets
 
 
Current
 
 
Crossroads wind farm rider under recovery (A)
$
13.4

$
14.9

Oklahoma demand program rider under recovery (A)
9.4

9.2

Fuel clause under recoveries
0.4

—

Other (A)
7.6

2.9

Total Current Regulatory Assets
$
30.8

$
27.0

Non-Current
 

 

Benefit obligations regulatory asset
$
364.1

$
370.6

Income taxes recoverable from customers, net
54.9

54.7

Smart Grid
42.9

42.8

Unamortized loss on reacquired debt
12.7

13.0

Deferred storm expenses
12.3

12.7

Deferred pension expenses
3.4

4.5

Other
12.3

12.3

Total Non-Current Regulatory Assets
$
502.6

$
510.6

Regulatory Liabilities
 

 

Current
 

 

Fuel clause over recoveries
$
81.6

$
109.2

Smart Grid rider over recovery (B)
21.6

24.1

Other (B)
6.5

7.8

Total Current Regulatory Liabilities
$
109.7

$
141.1

Non-Current
 

 

Accrued removal obligations, net
$
219.4

$
218.2

Deferred pension credits
14.9

17.7

Pension tracker
11.2

9.2

Total Non-Current Regulatory Liabilities
$
245.5

$
245.1

(A)
Included in Other Current Assets on the Condensed Consolidated Balance Sheets.
(B)
Included in Other Current Liabilities on the Condensed Consolidated Balance Sheets.    
Schedule of Change in Asset Retirement Obligation [Table Text Block]
The following table summarizes changes to the Company's asset retirement obligations during the three months ended March 31, 2013 and 2012.
 
Three Months Ended
 
March 31,
(In millions)
2013
2012
Balance at January 1
$
54.0

$
24.8

Liabilities settled
(0.1
)
—

Accretion expense
0.6

0.4

Revisions in estimated cash flows (A)
—

26.7

Balance at March 31
$
54.5

$
51.9

(A)
Due to changes to OG&E's asset retirement obligations related to its wind farms due to a change 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 the three months ended March 31, 2013. At both March 31, 2013 and December 31, 2012, there was no accumulated other comprehensive loss related to Enogex's noncontrolling interest in Atoka. All amounts below are presented net of tax and noncontrolling interest.
 
Pension Plan and Restoration of Retirement Income Plan
 
Postretirement Benefit Plans
 
 
 
 
 
Net loss
Prior service cost
 
Net loss
Prior service cost
Deferred commodity contracts hedging gains
Deferred interest rate swap hedging losses
Noncontrolling interest
Total
Balance at December 31, 2012
$
(49.3
)
$
0.1

 
$
(15.7
)
$
7.2

$
0.1

$
(0.5
)
$
(9.0
)
$
(49.1
)
Amounts reclassified from accumulated other comprehensive income (loss)
0.9

—

 
0.5

(0.5
)
(0.1
)
0.1

0.1

0.8

Balance at March 31, 2013
$
(48.4
)
$
0.1

 
$
(15.2
)
$
6.7

$
—

$
(0.4
)
$
(8.9
)
$
(48.3
)
Schedule of Amounts Reclassified 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 three months ended March 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
 
 
 
Gains (losses) on cash flow hedges
 
 
Commodity contracts
$
0.2

Cost of goods sold
Interest rate swap
(0.2
)
Interest expense
 
$
—

Total before tax
 
 
 
Amortization of defined benefit pension items
 
 
Actuarial gains (losses)
$
(1.3
)
(A)
 
(1.3
)
Total before tax
 
(0.4
)
Tax benefit
 
(0.9
)
Net of tax
 
(0.1
)
Noncontrolling interest
 
$
(0.8
)
Net of tax and noncontrolling interest
 
 
 
Amortization of postretirement benefit plan items
 
 
Actuarial gains (losses)
$
(0.8
)
(A)
Prior service cost
0.8

(A)
 
—

Total before tax
 
 
 
Total reclassifications for the period
$
(0.8
)
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 12 for additional information).