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Fair Value Measurements (Tables)
 9 Months Ended
Sep. 30, 2013
Fair Value Disclosures [Abstract]  
Schedule of Assets and Liabilities Measured at Fair Value on a Recurring Basis [Table Text Block]
The Company had no material financial instruments measured at fair value on a recurring basis at September 30, 2013. The following table summarizes the Company's assets and liabilities that are measured at fair value on a recurring basis at December 31, 2012 as well as presents the Company's commodity contracts fair value included in the Company's Condensed Consolidated Balance Sheet at December 31, 2012. The Company adopted the FASB's accounting guidance requiring additional disclosures for balance sheet offsetting of assets and liabilities effective January 1, 2013. The Company posted $0.2 million of collateral at December 31, 2012 which has been included within netting adjustments in the table below. The Company held no collateral at December 31, 2012. The Company has offset all amounts subject to master netting agreements in the Company's Condensed Consolidated Balance Sheet at December 31, 2012. The Company held no Level 3 investments at December 31, 2012.
December 31, 2012
(In millions)
Commodity Contracts
Gas Imbalances (A)
 
Assets
Liabilities
Assets (B)
Liabilities (C)
Quoted market prices in active market for identical assets (Level 1)
$
5.0

$
5.0

$
—

$
—

Significant other observable inputs (Level 2)
0.5

0.5

3.1

3.8

Total fair value
5.5

5.5

3.1

3.8

Netting adjustments
(5.0
)
(5.2
)
—

—

Total
$
0.5

$
0.3

$
3.1

$
3.8

(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 assets exclude fuel reserves for under retained fuel due from shippers of $5.9 million at December 31, 2012, 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.
(C)
Gas imbalance liabilities exclude fuel reserves for over retained fuel due to shippers of $1.2 million at December 31, 2012, 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.
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 at September 30, 2013 and December 31, 2012.
 
September 30, 2013
December 31, 2012
(In millions)
Carrying Amount 
Fair
Value
Carrying Amount 
 Fair
Value
Long-Term Debt
 
 
 
 
OG&E Senior Notes
$
2,154.3

$
2,455.2

$
1,904.2

$
2,401.6

OG&E Industrial Authority Bonds
135.4

135.4

135.4

135.4

OG&E Tinker Debt
10.4

9.1

10.7

10.0

OGE Energy Senior Notes
99.9

103.7

99.9

106.3

Enogex LLC Senior Notes
(A)

(A)

448.4

493.4

Enogex LLC Term Loan
(A)

(A)

250.0

250.0


(A)
As a result of the formation of Enable Midstream Partners on May 1, 2013 and the Company's deconsolidation of Enogex Holdings, the Company's consolidated financial statements do not include any obligations for the Enogex LLC Senior Notes and Enogex LLC Term Loan as of May 1, 2013.