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Summary of Significant Accounting Policies (Tables)
 6 Months Ended
Jun. 30, 2012
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)
June 30, 2012
December 31, 2011
Regulatory Assets
 
 
Current
 
 
Oklahoma demand program rider under recovery (A)
$
12.3

$
8.1

Crossroads rider under recovery (A)
10.6

2.5

Fuel clause under recoveries
0.7

1.8

Other (A)
11.3

3.6

Total Current Regulatory Assets
$
34.9

$
16.0

Non-Current
 

 

Benefit obligations regulatory asset
$
345.1

$
359.2

Income taxes recoverable from customers, net
54.7

54.0

Smart Grid
42.3

37.2

Deferred storm expenses
18.9

23.8

Unamortized loss on reacquired debt
13.6

14.2

Deferred pension expenses
6.8

9.1

Other
12.7

10.4

Total Non-Current Regulatory Assets
$
494.1

$
507.9

Regulatory Liabilities
 

 

Current
 

 

Fuel clause over recoveries
$
65.4

$
7.7

Smart Grid rider over recovery (B)
25.9

24.3

Other (B)
15.4

13.7

Total Current Regulatory Liabilities
$
106.7

$
45.7

Non-Current
 

 

Accrued removal obligations, net
$
213.6

$
208.2

Pension tracker
28.9

22.5

Total Non-Current Regulatory Liabilities
$
242.5

$
230.7

(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 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.
(In millions)
 
Balance at January 1, 2012
$
24.8

Accretion expense
0.9

Revisions in estimated cash flows
26.7

Balance at June 30, 2012
$
52.4
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
The following table summarizes the components of accumulated other comprehensive loss at June 30, 2012 and December 31, 2011 attributable to OGE Energy. At both June 30, 2012 and December 31, 2011, there was no accumulated other comprehensive loss related to Enogex's noncontrolling interest in Atoka.
(In millions)
June 30, 2012
December 31, 2011
Pension Plan and Restoration of Retirement Income Plan:
 
 
Net loss
$
(40.6
)
$
(42.1
)
Prior service cost
—

(0.1
)
Postretirement plans:
 
 
Net loss                                                                                              
(14.4
)
(15.4
)
Prior service cost
8.1

9.0

Net transition obligation
(0.1
)
(0.1
)
Deferred commodity contracts hedging gains (losses)
(0.3
)
3.3

Deferred interest rate swaps hedging losses
(0.6
)
(0.7
)
Total accumulated other comprehensive loss
(47.9
)
(46.1
)
Less:  Accumulated other comprehensive loss attributable to noncontrolling interests
(6.4
)
(5.5
)
Accumulated other comprehensive loss, net of tax
$
(41.5
)
$
(40.6
)