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Fair Value Measurements (Tables)
 12 Months Ended
Dec. 31, 2011
Fair Value Disclosures [Abstract]  
Schedule of Assets and Liabilities Measured at Fair Value on a Recurring Basis [Table Text Block]
 
The following tables summarize the Company's assets and liabilities that are measured at fair value on a recurring basis at December 31, 2011 and 2010 as well as reconcile the Company's commodity contracts fair value to PRM Assets and Liabilities on the Company's Consolidated Balance Sheets at December 31, 2011 and 2010. There were no Level 3 investments held at December 31, 2011.
December 31, 2011
(In millions)
Commodity Contracts
Gas Imbalances (A)
 
Assets
Liabilities
Assets
Liabilities (B)
Quoted market prices in active market for identical assets (Level 1)
$
57.1

$
52.3

$
—

$
—

Significant other observable inputs (Level 2)
4.2

1.2

1.8

7.8

Total fair value
61.3

53.5

1.8

7.8

Netting adjustments
(57.5
)
(53.0
)
—

—

Total
$
3.8

$
0.5

$
1.8

$
7.8

 
 
 
 
 
December 31, 2010
(In millions)
Commodity Contracts
Gas Imbalances (A)
 
Assets
Liabilities
Assets
Liabilities (B)
Quoted market prices in active market for identical assets (Level 1)
$
20.6

$
20.2

$
—

$
—

Significant other observable inputs (Level 2)
2.7

30.7

2.5

2.8

Significant unobservable inputs (Level 3)
13.3

—

—

—

Total fair value
36.6

50.9

2.5

2.8

Netting adjustments
(34.4
)
(34.1
)
—

—

Total
$
2.2

$
16.8

$
2.5

$
2.8

(A)
The Company uses the market approach to fair value its gas imbalance assets and liabilities, using an average of the Inside FERC Gas Market Report for Panhandle Eastern Pipe Line Co. (Texas, Oklahoma Mainline), ONEOK (Oklahoma) and ANR Pipeline (Oklahoma) indices.
(B)
Gas imbalance liabilities exclude fuel reserves for over retained fuel due to shippers of $2.0 million and $3.9 million at December 31, 2011 and 2010, respectively, which fuel reserves are based on the value of natural gas at the time the imbalance was created and which are not subject to revaluation at fair market value.
Fair Value Assets and Liabilities Measured on Recurring Basis Unobservable Input Reconciliation [Table Text Block]
 
The following table summarizes the Company's assets and liabilities that are measured at fair value on a recurring basis using significant unobservable inputs (Level 3).
 
Commodity Contracts
 
Assets
Liabilities
(In millions)
2011
2010
2011
2010
Balance at January 1
$
13.3

$
49.0

$
—

$
14.7

Total gains or losses
 
 
 
 
     Included in other comprehensive income
(5.4
)
(10.0
)
—

—

Settlements
(7.9
)
(25.7
)
—

(14.7
)
Balance at December 31
$
—

$
13.3

$
—

$
—
Schedule of Fair Value and Carrying Amount of PRM Financial Instruments [Table Text Block]
The following table summarizes the fair value and carrying amount of the Company's financial instruments, including derivative contracts related to the Company's PRM activities, at:
 
2011
2010
December 31 (In millions)
Carrying Amount 
Fair
Value
Carrying Amount 
 Fair
Value
Price Risk Management Assets
 
 
 
 
Energy Derivative Contracts
$
3.8

$
3.8

$
2.2

$
2.2

Price Risk Management Liabilities
 
 
 
 
Energy Derivative Contracts
$
0.5

$
0.5

$
16.8

$
16.8

Long-Term Debt
 
 
 
 
OG&E Senior Notes
$
1,903.8

$
2,383.8

$
1,655.0

$
1,831.5

OGE Energy Senior Notes
99.8

108.5

99.7

106.4

OG&E Industrial Authority Bonds
135.4

135.4

135.4

135.4

Enogex LLC Senior Notes
448.1

497.9

447.8

480.7

Enogex LLC Revolving Credit Agreement
150.0

150.0

25.0

25.0