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Income Taxes (Tables)
 12 Months Ended
Dec. 31, 2012
Income Taxes [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)
2012
2011
2010
Provision (Benefit) for Current Income Taxes 
 
 
 
Federal
$
(9.1
)
$
(5.4
)
$
12.8

State
0.5

0.1

1.8

Total Provision (Benefit) for Current Income Taxes 
(8.6
)
(5.3
)
14.6

Provision for Deferred Income Taxes, net 
 
 
 
Federal
147.3

165.5

139.8

State
(1.5
)
3.8

10.3

Total Provision for Deferred Income Taxes, net 
145.8

169.3

150.1

Deferred Federal Investment Tax Credits, net
(2.1
)
(3.3
)
(3.7
)
Total Income Tax Expense
$
135.1

$
160.7

$
161.0
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]
The following schedule reconciles the statutory Federal tax rate to the effective income tax rate:
Year ended December 31
2012
2011
2010
Statutory Federal tax rate
35.0
 %
35.0
 %
35.0
 %
Amortization of net unfunded deferred taxes
0.8

0.7

0.7

Medicare Part D subsidy
—

0.2

2.6

Qualified production activities
—

—

(0.2
)
State income taxes, net of Federal income tax benefit
(0.1
)
0.6

1.7

Federal investment tax credits, net
(0.4
)
(0.7
)
(0.8
)
401(k) dividends
(0.5
)
(0.5
)
(0.6
)
Income attributable to noncontrolling interest
(1.6
)
(1.3
)
(0.4
)
Federal renewable energy credit (A)
(7.2
)
(3.4
)
(3.4
)
Other
—

0.1

0.3

Effective income tax rate
26.0
 %
30.7
 %
34.9
 %
(A)
These are credits associated with the production from OG&E's wind farms.
Schedule of Deferred Tax Assets and Liabilities [Table Text Block]
The deferred tax provisions are recognized as costs in the ratemaking process by the commissions having jurisdiction over the rates charged by OG&E.  The components of Deferred Income Taxes at December 31, 2012 and 2011, respectively, were as follows:
December 31 (In millions)
2012
2011
Current Deferred Income Tax Assets
 
 
Net operating losses
$
152.4

$
15.8

Accrued liabilities
27.1

13.2

Federal tax credits
6.0

—

Accrued vacation
3.8

4.2

Uncollectible accounts
1.0

1.4

Total Current Deferred Income Tax Assets
190.3

34.6

Current Accrued Income Tax Liabilities
 
 
Derivative instruments
(2.6
)
(2.5
)
Total Current Accrued Income Tax Liabilities
(2.6
)
(2.5
)
Current Deferred Income Tax Assets, net
$
187.7

$
32.1

 
 
 
Non-Current Deferred Income Tax Liabilities
 
 
Accelerated depreciation and other property related differences
$
1,660.3

$
1,437.5

Investment in Enogex Holdings
638.0

571.8

Company pension plan
52.4

67.5

Income taxes refundable to customers, net
21.2

28.0

Regulatory asset
18.8

21.2

Bond redemption-unamortized costs
4.0

4.4

Derivative instruments
1.5

—

Total Non-Current Deferred Income Tax Liabilities
2,396.2

2,130.4

Non-Current Deferred Income Tax Assets
 
 
Net operating losses
(159.1
)
(225.2
)
State tax credits
(83.7
)
(63.0
)
Regulatory liabilities
(71.4
)
(65.3
)
Federal tax credits
(69.6
)
(49.7
)
Postretirement medical and life insurance benefits
(57.6
)
(50.2
)
Derivative instruments
—

(12.1
)
Deferred Federal investment tax credits
(1.5
)
(2.3
)
Other
(4.5
)
(11.2
)
Total Non-Current Deferred Income Tax Assets
(447.4
)
(479.0
)
Non-Current Deferred Income Tax Liabilities, net
$
1,948.8

$
1,651.4
Summary of Tax Credit Carryforwards [Table Text Block]
The Company sustained Federal and state tax operating losses in 2012 and 2011 caused primarily by bonus depreciation and other book verses tax temporary differences. As a result, the Company accrued Federal and state income tax benefits in 2012 and 2011. The Company can no longer carry these losses back to prior periods, therefore, these losses are being carried forward. In addition to the operating losses, the Company was unable to utilize the various tax credits that were generating during these years. These tax losses and credits are being carried as deferred tax assets and will be utilized in future periods. Under current law, the Company anticipates future taxable income will be sufficient to utilize all of the losses and credits before they begin to expire, accordingly no valuation allowance is considered necessary. The following table summarizes these carry forwards:
(In millions)
Carry Forward Amount
Deferred Tax Asset
Earliest Expiration Date
Net operating losses
 
 
 
State operating loss
$
1,026.8

$
37.8

2030
Federal operating loss
781.9

273.7

2030
Federal tax credits
75.6

75.6

2029
State tax credits
 
 
 
Oklahoma investment tax credits
100.5

65.3

N/A
Oklahoma capital investment board credits
7.3

7.3

N/A
Oklahoma zero emission tax credits
16.2

11.1

2020