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Retirement Plans and Postretirement Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2012
Retirement Plans and Postretirement Benefit Plans [Abstract]  
Schedule of Net Funded Status [Table Text Block]
The following table presents the status of the Company's Pension Plan and Restoration of Retirement Income Plan at December 31, 2012 and 2011. These amounts have been recorded in Accrued Benefit Obligations with the offset in Accumulated Other Comprehensive Loss (except OG&E's portion which is recorded as a regulatory asset as discussed in Note 1) in the Company's Consolidated Balance Sheet.  The amounts in Accumulated Other Comprehensive Loss and those recorded as a regulatory asset represent a net periodic benefit cost to be recognized in the Consolidated Statements of Income in future periods.
 
Pension Plan
Restoration of Retirement
Income Plan
December 31 (In millions)
2012
2011
2012
2011
Benefit obligations
$
(747.1
)
$
(697.7
)
$
(14.5
)
$
(13.3
)
Fair value of plan assets
626.0

589.8

—

—

Funded status at end of year
$
(121.1
)
$
(107.9
)
$
(14.5
)
$
(13.3
)

The following table presents the status of the Company's postretirement benefit plans at December 31, 2012 and 2011. These amounts have been recorded in Accrued Benefit Obligations with the offset in Accumulated Other Comprehensive Loss (except OG&E's portion which is recorded as a regulatory asset as discussed in Note 1) in the Company's Consolidated Balance Sheet.  The amounts in Accumulated Other Comprehensive Loss and those recorded as a regulatory asset represent a net periodic benefit cost to be recognized in the Consolidated Statements of Income in future periods.
December 31 (In millions)
2012
2011
Benefit obligations
$
(301.0
)
$
(280.6
)
Fair value of plan assets
59.6

61.0

Funded status at end of year
$
(241.4
)
$
(219.6
)
 
Schedule of Expected Benefit Payments [Table Text Block]
The following table summarizes the benefit payments the Company expects to pay related to its Pension Plan and Restoration of Retirement Income Plan.  These expected benefits are based on the same assumptions used to measure the Company's benefit obligation at the end of the year and include benefits attributable to estimated future employee service. 
 
(In millions)
Projected Benefit Payments
2013
$
75.1

2014
94.5

2015
84.7

2016
77.2

2017
71.5

After 2017
295.3

The Medicare Prescription Drug, Improvement and Modernization Act of 2003 expanded coverage for prescription drugs.  The following table summarizes the gross benefit payments the Company expects to pay related to its postretirement benefit plans, including prescription drug benefits.
 
 
 
(In millions)
Gross Projected
Postretirement
Benefit
Payments
2013
$
15.4

2014
16.3

2015
17.0

2016
17.6

2017
18.1

After 2017
94.9
Projected Benefit Obligation Funded Status Thresholds [Table Text Block]
The Pension Plan assets are held in a trust which follows an investment policy and strategy designed to reduce the funded status volatility of the Plan by utilizing liability driven investing. The purpose of liability driven investing is to structure the asset portfolio to more closely resemble the pension liability and thereby more effectively hedge against changes in the liability. The investment policy follows a glide path approach that shifts a higher portfolio weighting to fixed income as the Plan's funded status increases. The table below sets forth the targeted fixed income and equity allocations at different funded status levels.
Projected Benefit Obligation Funded Status Thresholds
<90%
95%
100%
105%
110%
115%
120%
Fixed income
50%
58%
65%
73%
80%
85%
90%
Equity
50%
42%
35%
27%
20%
15%
10%
Total
100%
100%
100%
100%
100%
100%
100%
Pension Plan Equity Asset Allocation Table [Table Text Block]
Within the portfolio's overall allocation to equities, the funds are allocated according to the guidelines in the table below.
        Asset Class
Target Allocation
Minimum
Maximum
Domestic All-Cap/Large Cap Equity                                        
50%
50%
60%
Domestic Mid-Cap Equity                                           
15%
5%
25%
Domestic Small-Cap Equity
15%
5%
25%
International Equity                                           
20%
10%
30%
Schedule of Allocation of Plan Assets [Table Text Block]
The following tables summarize the postretirement benefit plans investments that are measured at fair value on a recurring basis at December 31, 2012 and 2011.  There were no Level 2 investments held by the postretirement benefit plans at December 31, 2012 and 2011.
(In millions)
December 31, 2012
Level 1
Level 3
Group retiree medical insurance contract (A)
$
53.3

$
—

$
53.3

Mutual funds investment
 
 
 
U.S. equity investments
6.0

6.0

—

Money market funds investment
0.3

0.3

—

Total Plan investments
$
59.6

$
6.3

$
53.3

(In millions)
December 31, 2011
Level 1
Level 3
Group retiree medical insurance contract (A)
$
54.3

$
—

$
54.3

Mutual funds investment
 
 
 
U.S. equity investments
5.3

5.3

—

Money market funds investment
0.7

0.7

—

Cash
0.7

0.7

—

Total Plan investments
$
61.0

$
6.7

$
54.3

(A)
This category represents a group retiree medical insurance contract which invests in a pool of common stocks, bonds and money market accounts, of which a significant portion is comprised of mortgage-backed securities.
The following tables summarize the Pension Plan's investments that are measured at fair value on a recurring basis at December 31, 2012 and 2011. There were no Level 3 investments held by the Pension Plan at December 31, 2012 and 2011. 
(In millions)
December 31, 2012
Level 1
Level 2
Common stocks
 
 
 
U.S. common stocks
$
232.2

$
232.2

$
—

Foreign common stocks
39.9

39.9

—

U.S. Government obligations
 
 
 
U.S. treasury notes and bonds (A)
138.6

138.6

—

Mortgage-backed securities
55.8

—

55.8

Bonds, debentures and notes (B)
 

 

 

Corporate fixed income and other securities
98.4

—

98.4

Mortgage-backed securities
13.5

—

13.5

Commingled fund (C)
34.9

—

34.9

Common/collective trust (D)
25.6

—

25.6

Foreign government bonds
3.9

—

3.9

U.S. municipal bonds
0.8

—

0.8

Interest-bearing cash
0.2

0.2

—

Forward contracts
 
 
 
Receivable (foreign currency)
0.4

—

0.4

Payable (foreign currency)
(0.4
)
—

(0.4
)
Total Plan investments
$
643.8

$
410.9

$
232.9

Receivable from broker for securities sold
0.8

 

 

Interest and dividends receivable
2.8

 

 

Payable to broker for securities purchased
(21.4
)
 

 

Total Plan assets
$
626.0

 

 

(In millions)
December 31, 2011
Level 1
Level 2
Common stocks
 
 
 
U.S. common stocks
$
179.7

$
179.7

$
—

Foreign common stocks
59.5

59.5

—

U.S. Government obligations
 

 

 

U.S. treasury notes and bonds (A)
118.8

118.8

—

Mortgage-backed securities
72.0

—

72.0

Other securities
1.0

—

1.0

Bonds, debentures and notes (B)
 

 

 

Corporate fixed income and other securities
95.3

—

95.3

Mortgage-backed securities
17.2

—

17.2

Commingled fund (E)
38.5

—

38.5

Common/collective trust (D)
29.6

—

29.6

Foreign government bonds
2.9

—

2.9

Interest-bearing cash
2.1

2.1

—

U.S. municipal bonds
1.7

—

1.7

Preferred stocks (foreign)
0.6

0.6

—

Forward contracts
 
 
 
Receivable (foreign currency)
4.1

—

4.1

Payable (foreign currency)
(4.1
)
—

(4.1
)
Total Plan investments
$
618.9

$
360.7

$
258.2

Receivable from broker for securities sold
4.8

 

 

Interest and dividends receivable
3.1

 

 

Payable to broker for securities purchased
(37.0
)
 

 

Total Plan assets
$
589.8

 

 

(A)
This category represents U.S. treasury notes and bonds with a Moody's Investors Services rating of Aaa and Government Agency Bonds with a Moody's Investors Services rating of A1 or higher.
(B)
This category primarily represents U.S. corporate bonds with an investment grade rating at or above Baa3 or BBB- by Moody's Investors Services, Standard & Poor's Ratings Services or Fitch Ratings.
(C)
This category represents units of participation in a commingled fund that primarily invested in stocks of international companies and emerging markets.
(D)
This category represents units of participation in an investment pool which primarily invests in foreign or domestic bonds, debentures, mortgages, equipment or other trust certificates, notes, obligations issued or guaranteed by the U.S. Government or its agencies, bank certificates of deposit, bankers' acceptances and repurchase agreements, high grade commercial paper and other instruments with money market characteristics with a fixed or variable interest rate. There are no restrictions on redemptions in the common/collective trust.
(E)
This category represents units of participation in a commingled fund that primarily invest in stocks and bonds of U.S. companies.
Schedule of Effect of Significant Unobservable Inputs, Changes in Plan Assets [Table Text Block]
The following table summarizes the postretirement benefit plans investments that are measured at fair value on a recurring basis using significant unobservable inputs (Level 3).
Year ended December 31 (In millions)
2012
Group retiree medical insurance contract
 
Beginning balance
$
54.3

Net unrealized gains related to instruments held at the reporting date
5.5

Interest income
1.2

Dividend income
0.6

Realized gains
0.6

Administrative expenses and charges
(0.1
)
Claims paid
(8.8
)
Ending balance
$
53.3
Schedule of Effect of One-Percentage-Point Change in Assumed Health Care Cost Trend Rates [Table Text Block]
A one-percentage point change in the assumed health care cost trend rate would have the following effects: 
ONE-PERCENTAGE POINT INCREASE
Year ended December 31 (In millions)
2012
2011
2010
Effect on aggregate of the service and interest cost components
$
—

$
—

$
3.1

Effect on accumulated postretirement benefit obligations
0.1

0.1

0.7

ONE-PERCENTAGE POINT DECREASE
Year ended December 31 (In millions)
2012
2011
2010
Effect on aggregate of the service and interest cost components
$
0.1

$
0.1

$
2.5

Effect on accumulated postretirement benefit obligations
0.9

0.6

1.6

 
Schedule of Accumulated Benefit Obligations in Excess of Fair Value of Plan Assets [Table Text Block]
The following table presents the status of the Company's Pension Plan, the Restoration of Retirement Income Plan and the postretirement benefit plans for 2012 and 2011. The benefit obligation for the Company's Pension Plan and the Restoration of Retirement Income Plan represents the projected benefit obligation, while the benefit obligation for the postretirement benefit plans represents the accumulated postretirement benefit obligation. The accumulated postretirement benefit obligation for the Company's Pension Plan and Restoration of Retirement Income Plan differs from the projected benefit obligation in that the former includes no assumption about future compensation levels. The accumulated postretirement benefit obligation for the Pension Plan and the Restoration of Retirement Income Plan at December 31, 2012 was $705.2 million and $12.7 million, respectively. The accumulated postretirement benefit obligation for the Pension Plan and the Restoration of Retirement Income Plan at December 31, 2011 was $656.1 million and $11.9 million, respectively. The details of the funded status of the Pension Plan, the Restoration of Retirement Income Plan and the postretirement benefit plans and the amounts included in the Consolidated Balance Sheets are as follows:
 
Pension Plan
Restoration of Retirement
Income Plan
Postretirement
Benefit Plans
 December 31 (In millions)
2012
2011
2012
2011
2012
2011
Change in Benefit Obligation
 
 
 
 
 
 
Beginning obligations
$
(697.7
)
$
(640.9
)
$
(13.3
)
$
(10.8
)
$
(280.6
)
$
(337.1
)
Service cost
(17.9
)
(17.6
)
(1.0
)
(1.0
)
(4.1
)
(3.5
)
Interest cost
(30.1
)
(33.3
)
(0.6
)
(0.6
)
(11.9
)
(12.5
)
Plan amendments
—

—

—

—

—

91.4

Participants' contributions
—

—

—

—

(3.5
)
(8.1
)
Medicare subsidies received
—

—

—

—

(0.5
)
(2.0
)
Actuarial gains (losses)
(61.4
)
(48.3
)
(1.8
)
(1.0
)
(12.9
)
(25.7
)
Benefits paid
60.0

42.4

2.2

0.1

12.5

16.9

Ending obligations
$
(747.1
)
$
(697.7
)
$
(14.5
)
$
(13.3
)
$
(301.0
)
$
(280.6
)
 
 
 
 
 
 
 
Change in Plans' Assets
 
 
 
 
 
 
Beginning fair value
$
589.8

$
574.0

$
—

$
—

$
61.0

$
58.5

Actual return on plans' assets
61.2

8.2

—

—

4.5

2.7

Employer contributions
35.0

50.0

2.2

0.1

2.6

6.6

Participants' contributions
—

—

—

—

3.5

8.1

Medicare subsidies received
—

—

—

—

0.5

2.0

Benefits paid
(60.0
)
(42.4
)
(2.2
)
(0.1
)
(12.5
)
(16.9
)
Ending fair value
$
626.0

$
589.8

$
—

$
—

$
59.6

$
61.0

Funded status at end of year
$
(121.1
)
$
(107.9
)
$
(14.5
)
$
(13.3
)
$
(241.4
)
$
(219.6
)
Schedule of Defined Benefit Plans Disclosures [Table Text Block]
Net Periodic Benefit Cost
 
Pension Plan
Restoration of Retirement
Income Plan
Postretirement Benefit Plans
Year ended December 31 (In millions)
2012
2011
2010
2012
2011
2010
2012
2011
2010
Service cost
$
17.9

$
17.6

$
16.7

$
1.0

$
1.0

$
0.9

$
4.1

$
3.5

$
4.3

Interest cost
30.1

33.3

31.8

0.6

0.6

0.5

11.9

12.5

17.0

Expected return on plan assets
(46.0
)
(45.5
)
(42.4
)
—

—

—

(3.0
)
(5.1
)
(6.9
)
Amortization of transition obligation
—

—

—

—

—

—

2.7

2.7

2.7

Amortization of net loss
23.8

19.2

21.3

0.4

0.4

0.3

20.6

18.3

12.1

Amortization of unrecognized prior service cost (A)
2.2

2.4

2.4

0.7

0.7

0.7

(16.5
)
(16.5
)
—

Settlement
—

—

—

0.9

—

—

—

—

—

Net periodic benefit cost (B)
$
28.0

$
27.0

$
29.8

$
3.6

$
2.7

$
2.4

$
19.8

$
15.4

$
29.2

(A)
Unamortized prior service cost is amortized on a straight-line basis over the average remaining service period to the first eligibility age of participants who are expected to receive a benefit and are active at the date of the plan amendment.
(B)
In addition to the $51.4 million, $45.1 million and $61.4 million and of net periodic benefit cost recognized in 2012, 2011 and 2010, respectively, the Company recognized the following:

•
an increase in pension expense in 2012, 2011 and 2010 of $8.3 million, $10.8 million and $8.1 million, respectively, to maintain the allowable amount to be recovered for pension expense in the Oklahoma jurisdiction which are included in the Pension tracker regulatory liability (see Note 1); and
•
an increase in postretirement medical expense in 2012 and 2011 of $0.8 million and $3.5 million, respectively, to maintain the allowable amount to be recovered for postretirement medical expense in the Oklahoma jurisdiction which are included in the Pension tracker regulatory liability (see Note 1).
Schedule of Assumptions Used [Table Text Block]
Rate Assumptions
 
Pension Plan and
Restoration of Retirement Income Plan
Postretirement
Benefit Plans
Year ended December 31
2012
2011
2010
2012
2011
2010
Discount rate
3.70
%
4.50
%
5.30
%
3.60
%
4.50
%
5.30
%
Rate of return on plans' assets
8.00
%
8.00
%
8.50
%
4.00
%
6.50
%
8.50
%
Compensation increases
4.20
%
4.40
%
4.40
%
N/A

N/A

N/A

Assumed health care cost trend:
 

 

 

 

 

 

Initial trend
N/A

N/A

N/A

8.55
%
8.75
%
8.99
%
Ultimate trend rate
N/A

N/A

N/A

4.48
%
4.48
%
5.00
%
Ultimate trend year
N/A

N/A

N/A

2028

2028

2020

N/A - not applicable