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Summary of Significant Accounting Policies (Tables)
 9 Months Ended
Sep. 30, 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:
 
September 30,
December 31,
(In millions)
2017
2016
Regulatory Assets
 
 
Current
 
 
Oklahoma demand program rider under recovery (A)
$
38.3

$
51.0

Fuel clause under recoveries
35.5

51.3

SPP cost tracker under recovery (A)
7.8

10.0

Other (A)
2.6

9.5

Total current regulatory assets
$
84.2

$
121.8

Non-current
 

 

Benefit obligations regulatory asset
$
189.0

$
232.6

Income taxes recoverable from customers, net
76.3

62.3

Deferred storm expenses
43.3

35.7

Smart Grid
34.7

43.2

Unamortized loss on reacquired debt
12.5

13.4

Other
17.6

17.6

Total non-current regulatory assets
$
373.4

$
404.8

Regulatory Liabilities
 

 

Current
 

 

Other (B)
$
3.3

$
12.3

Total current regulatory liabilities
$
3.3

$
12.3

Non-current
 

 

Accrued removal obligations, net
$
282.0

$
262.8

Pension tracker
40.4

35.5

Other
9.3

1.4

Total non-current regulatory liabilities
$
331.7

$
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 nine months ended September 30, 2017 and 2016.
 
Nine Months Ended September 30,
(In millions)
2017
2016
Balance at January 1
$
69.6

$
63.3

Accretion expense
2.3

2.1

Liabilities settled
—

(0.2
)
Revisions in estimated cash flows
2.4

—

Balance at September 30
$
74.3

$
65.2
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
The following tables summarize changes in the components of accumulated other comprehensive income (loss) attributable to the Company during the nine months ended September 30, 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
Prior service cost
Total
Balance at December 31, 2016
$
(32.1
)
$
0.1

 
$
2.7

$
—

$
(29.3
)
Other comprehensive income before reclassifications
—

—

 
—

6.7

6.7

Amounts reclassified from accumulated other comprehensive income (loss)
2.0

—

 
—

(0.2
)
1.8

Settlement cost
—

—

 
0.5

—

0.5

Net current period other comprehensive income
2.0

—


0.5

6.5

9.0

Balance at September 30, 2017
$
(30.1
)
$
0.1

 
$
3.2

$
6.5

$
(20.3
)

 
Pension Plan and Restoration of Retirement Income Plan
 
Postretirement Benefit Plans
 
(In millions)
Net income
 (loss)
Prior service cost
 
Net income
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)
2.3

—

 
—

(1.2
)
1.1

Settlement cost
5.0

—

 
—

—

5.0

Net current period other comprehensive income (loss)
7.3

—

 
—

(1.2
)
6.1

Balance at September 30, 2016
$
(31.9
)
$
0.1


$
2.5

$
0.3

$
(29.0
)
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, 2017 and 2016.
Details about Accumulated Other Comprehensive Income (Loss) Components
Amount Reclassified from Accumulated Other Comprehensive Income (Loss)
Affected Line Item in the Condensed Consolidated Statements of Comprehensive Income
 
Three Months Ended
Nine Months Ended
 
 
September 30,
September 30,
 
(In millions)
2017
2016
2017
2016
 
Amortization of Pension Plan and Restoration of Retirement Income Plan items
 
 
 
 
 
Actuarial losses (A)
$
(1.1
)
$
(1.2
)
$
(3.3
)
$
(3.5
)
Other Operation and Maintenance Expense
Settlement (A)
—

—

—

(8.2
)
Other Operation and Maintenance Expense
 
(1.1
)
(1.2
)
(3.3
)
(11.7
)
Income Before Taxes
 
(0.5
)
(0.4
)
(1.3
)
(4.4
)
Income Tax Expense
 
$
(0.6
)
$
(0.8
)
$
(2.0
)
$
(7.3
)
Net Income
 
 
 
 
 
 
Amortization of postretirement benefit plan items
 
 
 
 
 
Prior service credit (A)
$
0.4

$
0.6

$
0.4

$
1.9

Other Operation and Maintenance Expense
Settlement (A)
(0.7
)
—

(0.7
)
—

Other Operation and Maintenance Expense
 
(0.3
)
0.6

(0.3
)
1.9

Income Before Taxes
 
—

0.2

—

0.7

Income Tax Expense
 
$
(0.3
)
$
0.4

$
(0.3
)
$
1.2

Net Income
 
 
 
 
 
 
Total reclassifications for the period, net of tax
$
(0.9
)
$
(0.4
)
$
(2.3
)
$
(6.1
)
Net Income
(A)
These accumulated other comprehensive income (loss) components are included in the computation of net periodic benefit cost (see Note 10 for additional information).