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Retirement Plans and Postretirement Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2014
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]  
Schedule of Accumulated Benefit Obligations in Excess of Fair Value of Plan Assets [Table Text Block]
The following table presents the status of OG&E's Pension Plan, the Restoration of Retirement Income Plan and the postretirement benefit plans for 2014 and 2013. These amounts have been recorded in Accrued Benefit Obligations with the offset recorded as a regulatory asset in OG&E's Balance Sheet as discussed in Note 1.  The regulatory asset represents a net periodic benefit cost to be recognized in the Statements of Income in future periods. OG&E's portion of the benefit obligation for OGE Energy'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 OG&E'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, 2014 was $522.1 million and $2.6 million, respectively. The accumulated postretirement benefit obligation for the Pension Plan and the Restoration of Retirement Income Plan at December 31, 2013 was $483.0 million and $1.9 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 Balance Sheets are as follows:
 
Pension Plan
Restoration of Retirement
Income Plan
Postretirement
Benefit Plans
 December 31 (In millions)
2014
2013
2014
2013
2014
2013
Change in Benefit Obligation
 
 
 
 
 
 
Beginning obligations
$
503.6

$
574.6

$
2.1

$
2.2

$
202.4

$
236.4

Service cost
9.1

11.6

—

0.1

2.0

2.9

Interest cost
21.4

20.4

0.1

0.1

8.8

8.1

Participants' contributions
—

(49.9
)
—

—

2.7

2.5

Actuarial (gains) losses
56.3

(39.8
)
0.6

(0.2
)
14.0

(35.4
)
Benefits paid
(46.9
)
(13.3
)
—

(0.1
)
(12.3
)
(12.1
)
Ending obligations
$
543.5

$
503.6

$
2.8

$
2.1

$
217.6

$
202.4

 
 
 
 
 
 
 
Change in Plans' Assets
 
 
 
 
 
 
Beginning fair value
$
516.5

$
519.0

$
—

$
—

$
56.7

$
55.5

Actual return on plans' assets
62.9

60.7

—

—

1.7

3.4

Employer contributions
—

—

—

0.1

5.4

7.4

Participants' contributions
—

(49.9
)
—

—

2.7

2.5

Benefits paid
(46.9
)
(13.3
)
—

(0.1
)
(12.3
)
(12.1
)
Ending fair value
$
532.5

$
516.5

$
—

$
—

$
54.2

$
56.7

Funded status at end of year
$
(11.0
)
$
12.9

$
(2.8
)
$
(2.1
)
$
(163.4
)
$
(145.7
)
Schedule of Defined Benefit Plans Disclosures [Table Text Block]
 
Pension Plan
Restoration of Retirement
Income Plan
Postretirement Benefit Plans
Year ended December 31 (In millions)
2014
2013
2012
2014
2013
2012
2014
2013
2012
Service cost
$
9.1

$
11.6

$
10.9

$
—

$
0.1

$
0.1

$
2.0

$
2.9

$
2.7

Interest cost
21.4

20.4

23.5

0.1

0.1

0.1

8.8

8.1

9.4

Expected return on plan assets
(35.8
)
(38.9
)
(38.2
)
—

—

—

(2.2
)
(2.4
)
(2.8
)
Amortization of transition obligation
—

—

—

—

—

—

—

—

2.5

Amortization of net loss
11.4

20.7

19.3

0.1

—

0.1

11.0

18.2

17.4

Amortization of unrecognized prior service cost (A)
1.9

1.9

2.2

0.1

0.1

0.2

(13.7
)
(13.7
)
(13.6
)
Settlement
—

17.6

—

—

—

0.3

—

—

—

Net periodic benefit cost (B)
$
8.0

$
33.3

$
17.7

$
0.3

$
0.3

$
0.8

$
5.9

$
13.1

$
15.6

(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 $14.2 million, $46.7 million and $34.1 million of net periodic benefit cost recognized in 2014, 2013 and 2012, respectively, OG&E recognized the following:
 
•
an increase in pension expense in 2014, 2013 and 2012 of $11.2 million, $5.8 million and $8.3 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 asset or liability (see Note 1);
•
an increase in postretirement medical expense in 2014, 2013 and 2012 of $5.2 million, $0.6 million and $0.8 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 asset or liability (see Note 1); and
•
a deferral of pension expense in 2013 of $17.0 million which includes a portion of OGE Energy's pension settlement charge, related to the pension settlement charge of $17.6 million which is included in the Pension tracker regulatory account (see Note 1).
Schedule of Capitalized Pension and Postretirement Cost [Table Text Block]
(In millions)
2014
2013
2012
Capitalized portion of net periodic pension cost
$
2.6

$
5.0

$
6.1

Capitalized portion of net periodic postretirement benefit cost
1.8

4.0

5.1
Schedule of Assumptions Used [Table Text Block]
Rate Assumptions
 
Pension Plan and
Restoration of Retirement Income Plan
Postretirement
Benefit Plans
Year ended December 31
2014
2013
2012
2014
2013
2012
Discount rate
3.80
%
4.60
%
3.70
%
3.80
%
4.60
%
3.60
%
Rate of return on plans' assets
7.50
%
8.00
%
8.00
%
4.00
%
4.00
%
4.00
%
Compensation increases
4.20
%
4.20
%
4.20
%
N/A

N/A

N/A

Assumed health care cost trend:
 

 

 

 

 

 

Initial trend
N/A

N/A

N/A

7.85
%
8.35
%
8.55
%
Ultimate trend rate
N/A

N/A

N/A

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

N/A

N/A

2028

2028

2028

N/A - not applicable
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)
2014
2013
2012
Effect on aggregate of the service and interest cost components
$
—

$
—

$
—

Effect on accumulated postretirement benefit obligations
0.1

0.1

0.1

ONE-PERCENTAGE POINT DECREASE
Year ended December 31 (In millions)
2014
2013
2012
Effect on aggregate of the service and interest cost components
$
—

$
—

$
0.1

Effect on accumulated postretirement benefit obligations
0.5

0.4

0.7
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 OG&E's portion of OGE Energy's postretirement benefit plans investments that are measured at fair value on a recurring basis at December 31, 2014 and 2013.  There were no Level 2 investments held by the postretirement benefit plans at December 31, 2014 and 2013.
(In millions)
December 31, 2014
Level 1
Level 3
Group retiree medical insurance contract (A)
$
51.0

$
—

$
51.0

Mutual funds investment
 
 
 
U.S. equity investments
8.5

8.5

—

Money market funds investment
0.1

0.1

—

Total Plan investments
$
59.6

$
8.6

$
51.0

Plan investments attributable to affiliates
(5.4
)
 
 
Total Plan assets
$
54.2





(In millions)
December 31, 2013
Level 1
Level 3
Group retiree medical insurance contract (A)
$
53.1

$
—

$
53.1

Mutual funds investment
 
 
 
U.S. equity investments
7.9

7.9

—

Money market funds investment
0.4

0.4

—

Total Plan investments
$
61.4

$
8.3

$
53.1

Plan investments attributable to affiliates
(4.7
)
 
 
Total Plan assets
$
56.7





(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 OG&E's portion of OGE Energy's Pension Plan's investments that are measured at fair value on a recurring basis at December 31, 2014 and 2013.  There were no Level 3 investments held by the Pension Plan at December 31, 2014 and 2013. 
(In millions)
December 31, 2014
Level 1
Level 2
Common stocks
 
 
 
U.S. common stocks
$
201.4

$
201.4

$
—

Foreign common stocks
31.3

31.3

—

U.S. Government obligations
 
 
 
U.S. treasury notes and bonds (A)
203.2

203.2

—

Mortgage-backed securities
20.6

—

20.6

Bonds, debentures and notes (B)
 

 

 

Corporate fixed income and other securities
167.1

—

167.1

Mortgage-backed securities
19.3

—

19.3

Commingled fund (C)
25.1

—

25.1

Common/collective trust (D)
29.9

—

29.9

Foreign government bonds
7.2

—

7.2

U.S. municipal bonds
3.5

—

3.5

Interest-bearing cash
0.2

0.2

—

Preferred stocks (foreign)
1.2

1.2

—

Forward contracts
 
 
 
Receivable (foreign currency)
11.3

—

11.3

Payable (foreign currency)
(15.6
)
—

(15.6
)
Total Plan investments
$
705.7

$
437.3

$
268.4

Receivable from broker for securities sold
3.2

 

 

Interest and dividends receivable
3.9

 

 

Payable to broker for securities purchased
(33.0
)
 

 

Plan investments attributable to affiliates
(147.3
)
 
 
Total Plan assets
$
532.5

 

 

(In millions)
December 31, 2013
Level 1
Level 2
Common stocks
 
 
 
U.S. common stocks
$
236.8

$
236.8

$
—

Foreign common stocks
39.3

39.3

—

U.S. Government obligations
 
 
 
U.S. treasury notes and bonds (A)
159.8

159.8

—

Mortgage-backed securities
50.3

—

50.3

Bonds, debentures and notes (B)
 
 
 
Corporate fixed income and other securities
110.6

—

110.6

Mortgage-backed securities
22.3

—

22.3

Commingled fund (C)
29.2

—

29.2

Common/collective trust (D)
26.0

—

26.0

Foreign government bonds
4.0

—

4.0

U.S. municipal bonds
2.0

—

2.0

Interest-bearing cash
0.1

0.1

—

Forward contracts
 
 
 
Receivable (foreign currency)
1.1

—

1.1

Payable (foreign currency)
(1.1
)
—

(1.1
)
Total Plan investments
$
680.4

$
436.0

$
244.4

Receivable from broker for securities sold
11.5

 

 

Interest and dividends receivable
3.2

 

 

Payable to broker for securities purchased
(40.2
)
 

 

Plan investments attributable to affiliates
(138.4
)
 
 
Total Plan assets
$
516.5

 
 


(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.
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)
2014
Group retiree medical insurance contract
 
Beginning balance
$
53.1

Net unrealized gains related to instruments held at the reporting date
1.5

Interest income
1.0

Dividend income
0.6

Realized losses
(0.9
)
Claims paid
(4.3
)
Ending balance
$
51.0
Schedule of Expected Benefit Payments [Table Text Block]
The Medicare Prescription Drug, Improvement and Modernization Act of 2003 expanded coverage for prescription drugs.  The following table summarizes the gross benefit payments OG&E expects to pay related to its postretirement benefit plans, including prescription drug benefits.
 
 
 
(In millions)
Gross Projected
Postretirement
Benefit
Payments
2015
$
12.8

2016
13.1

2017
13.3

2018
13.5

2019
13.7

After 2019
67.6



The following table summarizes the benefit payments OG&E 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 OGE Energy's benefit obligation at the end of the year and include benefits attributable to estimated future employee service.
 
(In millions)
Projected Benefit Payments
2015
$
69.5

2016
63.3

2017
56.7

2018
53.2

2019
49.5

After 2019
177.6