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Income Taxes (Tables)
 12 Months Ended
Dec. 31, 2016
Income Tax Disclosure [Abstract]  
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]
The items comprising income tax expense are as follows:
Year ended December 31 (In millions)
2016
2015
2014
Provision (Benefit) for Current Income Taxes 
 
 
 
Federal
$
2.9

$
(17.5
)
$
(43.4
)
State
(5.3
)
(5.3
)
(6.3
)
Total Provision (Benefit) for Current Income Taxes 
(2.4
)
(22.8
)
(49.7
)
Provision for Deferred Income Taxes, net 
 
 
 
Federal
99.8

117.0

146.8

State
17.2

11.3

15.4

Total Provision for Deferred Income Taxes, net 
117.0

128.3

162.2

Deferred Federal Investment Tax Credits, net
(0.2
)
(0.7
)
(0.9
)
Total Income Tax Expense
$
114.4

$
104.8

$
111.6
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]
The following schedule reconciles the statutory tax rates to the effective income tax rate:
Year ended December 31
2016
2015
2014
Statutory Federal tax rate
35.0
 %
35.0
 %
35.0
 %
Amortization of net unfunded deferred taxes
0.8

0.9

0.8

Federal investment tax credits, net
(0.9
)
(0.2
)
(0.2
)
State income taxes, net of Federal income tax benefit
1.8

0.5

0.8

Federal renewable energy credit (A)
(8.2
)
(8.8
)
(9.4
)
Uncertain tax positions
0.1

0.7

0.7

Other
0.1

(0.1
)
—

Effective income tax rate
28.7
 %
28.0
 %
27.7
 %
(A)
Represents credits associated with the production from OG&E's wind farms.
Schedule of Deferred Tax Assets and Liabilities [Table Text Block]
The components of Deferred Income Taxes at December 31, 2016 and 2015, respectively, were as follows:
December 31 (In millions)
2016
2015
Non-Current Deferred Income Tax Liabilities, net
 
 
Accelerated depreciation and other property related differences
$
2,101.4

$
2,012.1

OG&E pension plan
48.0

55.1

Regulatory asset
34.4

32.7

Income taxes refundable to customers, net
24.1

22.0

Bond redemption-unamortized costs
4.3

4.8

Federal tax credits
(209.3
)
(174.0
)
State tax credits
(102.6
)
(98.6
)
Postretirement medical and life insurance benefits
(34.3
)
(40.8
)
Regulatory liabilities
(34.6
)
(46.3
)
Asset retirement obligations
(24.5
)
(22.5
)
Net operating losses
(26.1
)
(89.7
)
Other
(16.7
)
(7.1
)
Accrued liabilities
(8.0
)
(5.9
)
Accrued vacation
(2.4
)
(2.6
)
Deferred Federal investment tax credits
(0.8
)
(0.9
)
Uncollectible accounts
(0.6
)
(0.5
)
Non-Current Deferred Income Tax Liabilities, net
$
1,752.3

$
1,637.8
Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block]
Following is a reconciliation of OG&E’s total gross unrecognized tax benefits as of the years ended December 31, 2016, 2015, and 2014.
(In millions)
2016
2015
2014
Balance at January 1
$
20.2

$
16.1

$
12.0

Tax positions related to current year:
 
 
 
Additions
0.5

4.1

4.1

Balance at December 31
$
20.7

$
20.2

$
16.1
Summary of Tax Credit Carryforwards [Table Text Block]
The following table summarizes these carry forwards:
(In millions)
Carry Forward Amount
Deferred Tax Asset
Earliest Expiration Date
Net operating losses
 
 
 
State operating loss
$
403.1

$
14.8

2030
Federal operating loss
32.2

11.3

2030
Federal tax credits
209.3

209.3

2029
State tax credits
 
 
 
Oklahoma investment tax credits
121.7

79.1

N/A
Oklahoma capital investment board credits
7.3

7.3

N/A
Oklahoma zero emission tax credits
24.1

16.2

2020