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Summary of Significant Accounting Policies (Tables)
 9 Months Ended
Sep. 30, 2015
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, 2015
December 31, 2014
Regulatory Assets
 
 
Current
 
 
Oklahoma demand program rider under recovery (A)
$
30.3

$
19.7

Fuel clause under recoveries
1.6

68.3

Other (A)(C)
9.8

10.2

Total Current Regulatory Assets
$
41.7

$
98.2

Non-Current
 

 

Benefit obligations regulatory asset
$
241.6

$
261.1

Income taxes recoverable from customers, net
55.7

56.1

Smart Grid
43.7

43.9

Deferred storm expenses
16.6

17.5

Unamortized loss on reacquired debt
15.1

16.1

Other (C)
17.0

15.7

Total Non-Current Regulatory Assets
$
389.7

$
410.4

Regulatory Liabilities
 

 

Current
 

 

Crossroads wind farm rider over recovery (B)
$
7.2

$
10.3

Smart Grid rider over recovery (B)
5.3

12.5

Fuel clause over recoveries
34.5

—

Other (B)
2.2

1.6

Total Current Regulatory Liabilities
$
49.2

$
24.4

Non-Current
 

 

Accrued removal obligations, net
$
257.1

$
248.1

Pension tracker
19.9

14.9

Total Non-Current Regulatory Liabilities
$
277.0

$
263.0

(A)
Included in Other Current Assets on the Condensed Consolidated Balance Sheets.
(B)
Included in Other Current Liabilities on the Condensed Consolidated Balance Sheets.    
(C)
Prior year amount of $1.1 million reclassified from Non-Current Other assets to Current Other assets.
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, 2015 and 2014.
 
Nine Months Ended September 30,
(In millions)
2015
2014
Balance at January 1
$
58.6

$
55.2

Liabilities settled (A)
(0.4
)
(0.2
)
Accretion expense
1.9

1.9

Revisions in estimated cash flows (B)
1.6

1.7

Balance at September 30
$
61.7

$
58.6

(A)
In 2015, asset retirement obligations were settled for the asbestos abatement at one of OG&E's generating facilities.
(B)
Assumptions changed related to the estimated cost of removal for one of OG&E's generating facilities.

Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
The following table summarizes changes in the components of accumulated other comprehensive income (loss) attributable to the Company during the nine months ended September 30, 2015. All amounts below are presented net of tax.
 
Pension Plan and Restoration of Retirement Income Plan
 
Postretirement Benefit Plans
 
(In millions)
Net loss
Prior service cost
Settlement cost
 
Net loss
Prior service cost
Total
Balance at December 31, 2014
$
(36.8
)
$
0.1

$
—

 
$
(8.0
)
$
3.3

$
(41.4
)
Amounts reclassified from accumulated other comprehensive income (loss)
1.9

—

3.8

 
0.9

(1.3
)
5.3

Net current period other comprehensive income (loss)
1.9

—

3.8


0.9

(1.3
)
5.3

Balance at September 30, 2015
$
(34.9
)
$
0.1

$
3.8

 
$
(7.1
)
$
2.0

$
(36.1
)
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 income (loss) by the respective line items in net income during the three and nine months ended September 30, 2015 and 2014.
Details about Accumulated Other Comprehensive Income (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
 
 
September 30,
September 30,
 
(In millions)
2015
2014
2015
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 and restoration of retirement income plan items
 
 
 
 
 
Actuarial losses
$
(1.0
)
$
(0.8
)
$
(3.6
)
$
(2.3
)
(A)
Settlement cost
(6.2
)
—

(6.2
)
—

(A)
 
(7.2
)
(0.8
)
(9.8
)
(2.3
)
Total before tax
 
(2.7
)
(0.3
)
(4.1
)
(0.9
)
Tax benefit
 
$
(4.5
)
$
(0.5
)
$
(5.7
)
$
(1.4
)
Net of tax
 
 
 
 
 
 
Amortization of postretirement benefit plan items
 
 
 
 
 
Actuarial losses
$
(0.5
)
$
(0.2
)
$
(1.5
)
$
(1.0
)
(A)
Prior service credit
0.7

0.6

2.1

2.1

(A)
 
0.2

0.4

0.6

1.1

Total before tax
 
0.1

0.1

0.2

0.4

Tax (benefit) expense
 
$
0.1

$
0.3

$
0.4

$
0.7

Net of tax
 
 
 
 
 
 
Total reclassifications for the period
$
(4.4
)
$
(0.3
)
$
(5.3
)
$
(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).