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Summary of Significant Accounting Policies (Tables)
 9 Months Ended
Sep. 30, 2014
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)
September 30, 2014
December 31, 2013
Regulatory Assets
 
 
Current
 
 
Fuel clause under recoveries
$
84.3

$
26.2

Oklahoma demand program rider under recovery (A)
17.8

10.6

Crossroads wind farm rider under recovery (A)
—

4.7

Other (A)
8.7

7.3

Total Current Regulatory Assets
$
110.8

$
48.8

Non-Current
 

 

Benefit obligations regulatory asset
$
219.4

$
227.4

Income taxes recoverable from customers, net
56.1

56.5

Smart Grid
44.0

44.2

Deferred storm expenses
19.4

21.6

Unamortized loss on reacquired debt
16.5

11.8

Deferred pension credits
—

1.4

Other
17.2

16.2

Total Non-Current Regulatory Assets
$
372.6

$
379.1

Regulatory Liabilities
 

 

Current
 

 

Smart Grid rider over recovery (B)
$
14.5

$
16.7

Fuel clause over recoveries (B)
—

0.4

Crossroads wind farm rider over recovery (B)
10.7

—

Other (B)
1.6

3.1

Total Current Regulatory Liabilities
$
26.8

$
20.2

Non-Current
 

 

Accrued removal obligations, net
$
255.7

$
227.7

Pension tracker
10.9

—

Deferred pension credits
—

6.5

Total Non-Current Regulatory Liabilities
$
266.6

$
234.2

(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 nine months ended September 30, 2014 and 2013.
 
Nine Months Ended September 30,
(In millions)
2014
2013
Balance at January 1
$
55.2

$
54.0

Liabilities settled
(0.2
)
(0.4
)
Accretion expense
1.9

1.7

Revisions in estimated cash flows (A)
1.7

(0.7
)
Balance at September 30
$
58.6

$
54.6

(A)
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 the nine months ended September 30, 2014. 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 interest rate swap hedging losses
Total
Balance at December 31, 2013
$
(27.4
)
$
0.1

 
$
(5.8
)
$
5.1

$
(0.2
)
$
(28.2
)
Amounts reclassified from accumulated other comprehensive income (loss)
1.4

—

 
0.6

(1.3
)
0.2

0.9

Net current period other comprehensive income (loss)
1.4

—

 
0.6

(1.3
)
0.2

0.9

Balance at September 30, 2014
$
(26.0
)
$
0.1

 
$
(5.2
)
$
3.8

$
—

$
(27.3
)
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 and nine months ended September 30, 2014.
Details about Accumulated Other Comprehensive Loss Components
Amount Reclassified from Accumulated Other Comprehensive Income (Loss)
Affected Line Item in the Statement Where Net Income is Presented
 
Three Months Ended
Nine Months Ended
 
(In millions)
September 30, 2014
September 30, 2014
 
Losses on cash flow hedges
 
 
 
Interest rate swap
$
(0.1
)
$
(0.3
)
Interest expense
 
(0.1
)
(0.3
)
Total before tax
 
—

(0.1
)
Tax benefit
 
$
(0.1
)
$
(0.2
)
Net of tax
 
 
 
 
Amortization of defined benefit pension items
 
 
 
Actuarial losses
$
(0.8
)
$
(2.3
)
(A)
 
(0.8
)
(2.3
)
Total before tax
 
(0.3
)
(0.9
)
Tax benefit
 
$
(0.5
)
$
(1.4
)
Net of tax
 
 
 
 
Amortization of postretirement benefit plan items
 
 
 
Actuarial losses
$
(0.2
)
$
(1.0
)
(A)
Prior service credit
0.6

2.1

(A)
 
0.4

1.1

Total before tax
 
0.1

0.4

Tax expense
 
$
0.3

$
0.7

Net of tax
 
 
 
 
Total reclassifications for the period
$
(0.3
)
$
(0.9
)
Net of tax
(A)
These accumulated other comprehensive income (loss) components are included in the computation of net periodic benefit cost (see Note 10 for additional information).