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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Disclosure of Share-based Compensation Arrangements by Share-based Payment Award [Table Text Block]
The following table summarizes OG&E's pre-tax compensation expense and related income tax benefit for the years ended December 31, 2013, 2012 and 2011 related to performance units and restricted stock for OG&E employees.
Year ended December 31 (In millions)
2013
2012
2011
Performance units
 
 
 
Total shareholder return
$
1.7

$
1.7

$
1.6

Earnings per share
0.5

0.9

1.1

Total performance units
2.2

2.6

2.7

Restricted stock
0.1

0.1

0.2

Net compensation expense
$
2.3

$
2.7

$
2.9

Income tax benefit
$
0.9

$
1.2

$
1.2
Performance Units Total Shareholder Return Valuation Assumptions [Table Text Block]
  The number of performance units granted based on total shareholder return and the assumptions used to calculate the grant date fair value of the performance units based on total shareholder return are shown in the following table.
 
2013
2012
2011
Number of units granted to OG&E employees
71,850

81,122

86,604

Fair value of units granted
$
25.89

$
25.91

$
23.05

Expected dividend yield
2.8
%
3.0
%
3.2
%
Expected price volatility
20.0
%
22.0
%
33.0
%
Risk-free interest rate
0.37
%
0.38
%
1.40
%
Expected life of units (in years)
2.84

2.87

2.87
Performance Units Earnings Per Share Valuation Assumptions [Table Text Block]
The number of performance units granted based on earnings per share and the grant date fair value are shown in the following table.
 
2013
2012
2011
Number of units granted to OG&E employees
23,952

27,038

28,862

Fair value of units granted
$
26.73

$
23.82

$
20.81


Restricted Stock
 
Restricted Stock Valuation Assumptions [Table Text Block]
  The number of shares of restricted stock granted related to OG&E employees and the grant date fair value are shown in the following table.
 
2013
2012
2011
Shares of restricted stock granted to OG&E employees
3,824

2,216

4,468

Fair value of restricted stock granted
$
29.71

$
26.93

$
23.61
Schedule of Share-based Compensation, Activity [Table Text Block]
A summary of the activity for OGE Energy's performance units and restricted stock applicable to OG&E'S employees at December 31, 2013 and changes in 2013 are shown in the following table.
 
Performance Units
 
 
 
Total Shareholder Return
Earnings Per Share
Restricted Stock
(dollars in millions)
Number
of Units
 
Aggregate Intrinsic Value
Number
of Units
 
Aggregate Intrinsic Value
Number
of Shares
Aggregate Intrinsic Value
Units/Shares Outstanding at 12/31/12
224,012

 
 
74,670

 
 
6,046

 
Granted
71,850

(A)
 
23,952

(A)
 
3,824

 
Converted
(75,452
)
(B)
$
4.4

(25,152
)
(B)
$
1.5

N/A

 
Vested
N/A

 
 
N/A

 
 
(3,038
)
$
0.1

Forfeited
(7,940
)
 
 
(2,648
)
 
 
(884
)
 
Employee migration
(5,644
)
(C)
 
(1,884
)
(C)
 
—

 
Units/Shares Outstanding at 12/31/13
206,826

 
$
9.9

68,938

 
$
2.7

5,948

$
0.2

Units/Shares Fully Vested at 12/31/13
68,750

 
$
3.7

22,914

 
$
1.6

 
 
(A)
For performance units, this represents the target number of performance units granted.  Actual number of performance units earned, if any, is dependent upon performance and may range from 0 percent to 200 percent of the target.
(B)
These amounts represent performance units that vested at December 31, 2012 which were settled in February 2013.
(C)
Due to certain employees transferring between OG&E and its affiliates.
Schedule of Nonvested Share Activity [Table Text Block]
A summary of the activity for OGE Energy's non-vested performance units and restricted stock applicable to OG&E'S employees at December 31, 2013 and changes in 2013 are shown in the following table. 
 
Performance Units
 
 
 
Total Shareholder Return
Earnings Per Share
Restricted Stock
 
Number
of Units
 
Weighted-Average
Grant Date
Fair Value
Number
of Units
 
Weighted-Average
Grant Date
Fair Value
Number
of Shares
Weighted-Average
Grant Date
Fair Value
Units/Shares Non-Vested at 12/31/12
148,560

 
$
24.51

49,518

 
$
22.34

6,046

$
24.62

Granted
71,850

(A)
$
25.89

23,952

(A)
$
26.73

3,824

$
29.71

Vested
(68,750
)
 
$
23.05

(22,914
)
 
$
20.81

(3,038
)
$
23.51

Forfeited
(7,940
)
 
$
25.23

(2,648
)
 
$
24.03

(884
)
$
28.31

Employee migration
(5,644
)
(B)
$
24.74

(1,884
)
(B)
$
23.23

—

$
—

Units/Shares Non-Vested at 12/31/13
138,076

 
$
25.90

46,024

 
$
25.25

5,948

$
27.91

Units/Shares Expected to Vest
126,390

(C)
 
42,130

(C)
 
5,948

 
(A)
For performance units, this represents the target number of performance units granted.  Actual number of performance units earned, if any, is dependent upon performance and may range from 0 percent to 200 percent of the target.
(B)
Due to certain employees transferring between OG&E and its affiliates.
(C)
The intrinsic value of the performance units based on total shareholder return and earnings per share is $5.6 million and $1.1 million, respectively.
Fair Value of Vested Performance Units and Restricted Stock [Table Text Block]
Fair Value of Vested Performance Units and Restricted Stock

A summary of OG&E's fair value for its vested performance units and restricted stock is shown in the following table.
Year ended December 31 (In millions)
2013
2012
2011
Performance units
 
 
 
Total shareholder return
$
1.6

$
1.4

$
1.2

Earnings per share
1.0

0.8

0.6

Restricted stock
0.1

0.1

0.3
Schedule of Unrecognized Compensation Cost, Nonvested Awards [Table Text Block]
Unrecognized Compensation Cost

A summary of OG&E's unrecognized compensation cost for its non-vested performance units and restricted stock and the weighted-average periods over which the compensation cost is expected to be recognized are shown in the following table.
December 31, 2013
Unrecognized Compensation Cost (in millions)
Weighted Average to be Recognized (in years)
Performance units
 
 
Total shareholder return
$
1.7

1.63
Earnings per share
0.3

1.52
Total performance units
2.0


Restricted stock
0.1

2.17
Total
$
2.1
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]
 A summary of the activity for OGE Energy's stock options applicable to OG&E'S employees at December 31, 2013 and changes during 2013 are shown in the following table. 
(dollars in millions)
Number of Options
Weighted-Average Exercise Price
Aggregate Intrinsic Value
Weighted-Average Remaining Contractual Term
Options Outstanding at 12/31/12
7,000

$
9.62

 

 
 
Exercised
(7,000
)
$
(9.62
)
$
0.2

 
 
Options Outstanding at 12/31/13
—

$
—

$
—

0.00
years
Options Fully Vested and Exercisable at 12/31/13
—

$
—

$
—

0.00
years
Exercised Stock Options [Table Text Block]
A summary of the activity for OG&E's exercised stock options in 2013, 2012 and 2011 are shown in the following table.
Year ended December 31 (In millions)
2013
2012
2011
Intrinsic value (A)
$
0.2

$
0.2

$
0.3

(A)
The difference between the market value on the date of exercise and the option exercise price.