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Summary of Significant Accounting Policies (Tables)
 3 Months Ended
Mar. 31, 2017
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:
 
March 31,
December 31,
(In millions)
2017
2016
Regulatory Assets
 
 
Current
 
 
Fuel clause under recoveries
$
73.4

$
51.3

Oklahoma demand program rider under recovery (A)
45.6

51.0

SPP cost tracker under recovery (A)
14.6

10.0

Other (A)
8.6

9.5

Total Current Regulatory Assets
$
142.2

$
121.8

Non-Current
 

 

Benefit obligations regulatory asset
$
228.9

$
232.6

Income taxes recoverable from customers, net
65.6

62.3

Deferred storm expenses
40.5

35.7

Smart Grid
38.2

43.2

Unamortized loss on reacquired debt
13.1

13.4

Other
16.8

17.6

Total Non-Current Regulatory Assets
$
403.1

$
404.8

Regulatory Liabilities
 

 

Current
 

 

Other (B)
$
13.4

$
12.3

Total Current Regulatory Liabilities
$
13.4

$
12.3

Non-Current
 

 

Accrued removal obligations, net
$
268.6

$
262.8

Pension tracker
36.6

35.5

Other
1.5

1.4

Total Non-Current Regulatory Liabilities
$
306.7

$
299.7

(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 the Company's asset retirement obligations during the three months ended March 31, 2017 and 2016.
 
Three Months Ended March 31,
(In millions)
2017
2016
Balance at January 1
$
69.6

$
63.3

Accretion expense
0.7

0.7

Balance at March 31
$
70.3

$
64.0
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 three months ended March 31, 2017 and 2016. All amounts below are presented net of tax.
 
Pension Plan and Restoration of Retirement Income Plan
 
Postretirement Benefit Plans
 
(In millions)
Net income
 (loss)
Prior service cost
 
Net income (loss)
Prior service cost
Total
Balance at December 31, 2016
$
(32.1
)
$
0.1

 
$
2.7

$
—

$
(29.3
)
Amounts reclassified from accumulated other comprehensive income (loss)
0.6

—

 
—

—

0.6

Balance at March 31, 2017
$
(31.5
)
$
0.1

 
$
2.7

$
—

$
(28.7
)

 
Pension Plan and Restoration of Retirement Income Plan
 
Postretirement Benefit Plans
 
(In millions)
Net income
 (loss)
Prior service cost
 
Net income (loss)
Prior service cost
Total
Balance at December 31, 2015
$
(39.2
)
$
0.1

 
$
2.5

$
1.5

$
(35.1
)
Amounts reclassified from accumulated other comprehensive income (loss)
0.8

—

 
—

(0.4
)
0.4

Balance at March 31, 2016
$
(38.4
)
$
0.1


$
2.5

$
1.1

$
(34.7
)
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 months ended March 31, 2017 and 2016.
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
 
 
March 31,
 
(In millions)
2017
2016
 
Amortization of defined benefit pension and restoration of retirement income plan items
 
 
 
Actuarial losses
$
(1.0
)
$
(1.2
)
(A)
 
(0.4
)
(0.4
)
Income taxes
 
$
(0.6
)
$
(0.8
)
Net of tax
 
 
 
 
Amortization of postretirement benefit plan items
 
 
 
Prior service credit
$
—

$
0.6

(A)
 
—

0.6

Total before tax
 
—

0.2

Income taxes
 
$
—

$
0.4

Net of tax
 
 
 
 
Total reclassifications for the period
$
(0.6
)
$
(0.4
)
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).