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Retirement Plans and Postretirement Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2015
Retirement Plans and Postretirement Benefit Plans [Abstract]  
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 2015 and 2014. 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 Sheets.  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. 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, 2015 was $610.9 million and $24.6 million, respectively. The accumulated postretirement benefit obligation for the Pension Plan and the Restoration of Retirement Income Plan at December 31, 2014 was $688.4 million and $18.7 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)
2015
2014
2015
2014
2015
2014
Change in Benefit Obligation
 
 
 
 
 
 
Beginning obligations
$
725.0

$
658.1

$
19.7

$
14.0

$
280.9

$
258.2

Service cost
16.1

15.3

1.3

1.1

1.5

3.1

Interest cost
26.1

28.1

0.7

0.6

10.3

11.4

Plan curtailments
—

(0.7
)
—

—

—

(0.6
)
Plan settlements
(60.7
)
—

—

—

—

—

Participants' contributions
—

—

—

—

3.4

3.4

Actuarial (gains) losses
(11.3
)
79.3

4.0

4.1

(55.1
)
19.5

Benefits paid
(15.2
)
(55.1
)
(0.6
)
(0.1
)
(15.7
)
(14.1
)
Ending obligations
$
680.0

$
725.0

$
25.1

$
19.7

$
225.3

$
280.9

 
 
 
 
 
 
 
Change in Plans' Assets
 
 
 
 
 
 
Beginning fair value
$
679.8

$
654.9

$
—

$
—

$
59.6

$
61.4

Actual return on plans' assets
(22.2
)
80.0

—

—

(0.5
)
1.8

Employer contributions
—

—

0.6

0.1

8.5

7.1

Plan settlements
(60.7
)
—

—

—

—

—

Participants' contributions
—

—

—

—

3.4

3.4

Benefits paid
(15.2
)
(55.1
)
(0.6
)
(0.1
)
(15.7
)
(14.1
)
Ending fair value
$
581.7

$
679.8

$
—

$
—

$
55.3

$
59.6

Funded status at end of year
$
(98.3
)
$
(45.2
)
$
(25.1
)
$
(19.7
)
$
(170.0
)
$
(221.3
)
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)
2015
2014
2013
2015
2014
2013
2015
2014
2013
Service cost
$
16.1

$
15.3

$
19.0

$
1.3

$
1.1

$
1.2

$
1.5

$
3.1

$
4.3

Interest cost
26.1

28.1

26.7

0.7

0.6

0.5

10.3

11.4

10.3

Expected return on plan assets
(46.0
)
(45.3
)
(48.4
)
—

—

—

(2.4
)
(2.4
)
(2.5
)
Amortization of net loss
18.0

14.3

26.5

0.6

0.2

0.4

13.9

12.3

21.5

Amortization of unrecognized prior service cost (A)
0.4

1.7

1.8

0.1

0.2

0.3

(16.5
)
(16.5
)
(16.5
)
Curtailment
—

(0.2
)
—

—

—

—

—

—

—

Settlement
21.7

—

22.4

—

—

—

—

—

—

Total net periodic benefit cost
36.3

13.9

48.0

2.7

2.1

2.4

6.8

7.9

17.1

Less: Amount paid by unconsolidated affiliates
4.2

3.2

5.9

0.1

0.1

0.1

1.3

1.3

1.5

Net periodic benefit cost (B)
$
32.1

$
10.7

$
42.1

$
2.6

$
2.0

$
2.3

$
5.5

$
6.6

$
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 $40.2 million, $19.3 million and $60.0 million of net periodic benefit cost recognized in 2015, 2014 and 2013, respectively, the Company recognized the following:

•
an increase in pension expense in 2015, 2014 and 2013 of $12.8 million, $11.2 million and $5.8 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 2015, 2014 and 2013 of $5.8 million, $5.2 million and $0.6 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);
•
a deferral of pension expense in 2015 and 2013 of $14.0 million and $17.0 million related to pension settlement charges of $21.7 million and $22.4 million, respectively, in accordance with the Oklahoma pension tracker regulatory liability (see Note 1); and
•
a deferral of pension expense in 2015 of $1.9 million related to the Arkansas jurisdictional portion of the pension settlement charge of $21.7 million.
Schedule of Capitalized Pension and Postretirement Cost [Table Text Block]
(In millions)
2015
2014
2013
Capitalized portion of net periodic pension benefit cost
$
5.0

$
3.4

$
6.4

Capitalized portion of net periodic postretirement benefit cost
1.9

2.0

4.5
Schedule of Assumptions Used [Table Text Block]
Rate Assumptions
 
Pension Plan and
Restoration of Retirement Income Plan
Postretirement
Benefit Plans
Year ended December 31
2015
2014
2013
2015
2014
2013
Discount rate
4.00
%
3.80
%
4.60
%
4.25
%
3.80
%
4.60
%
Rate of return on plans' assets
7.50
%
7.50
%
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

6.10
%
7.85
%
8.35
%
Ultimate trend rate
N/A

N/A

N/A

4.50
%
4.48
%
4.48
%
Ultimate trend year
N/A

N/A

N/A

2026

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)
2015
2014
2013
Effect on aggregate of the service and interest cost components
$
—

$
—

$
—

Effect on accumulated postretirement benefit obligations
0.2

0.1

0.1

ONE-PERCENTAGE POINT DECREASE
Year ended December 31 (In millions)
2015
2014
2013
Effect on aggregate of the service and interest cost components
$
0.1

$
0.1

$
0.1

Effect on accumulated postretirement benefit obligations
0.7

0.7

0.6
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 Pension Plan's investments that are measured at fair value on a recurring basis at December 31, 2015 and 2014. There were no Level 3 investments held by the Pension Plan at December 31, 2015 and 2014. 
(In millions)
December 31, 2015
Level 1
Level 2
Common stocks
 
 
 
U.S. common stocks
$
189.0

$
189.0

$
—

Foreign common stocks
19.1

19.1

—

U.S. Government obligations
 
 
 
U.S. treasury notes and bonds (A)
158.9

158.9

—

Mortgage-backed securities
2.2

—

2.2

Bonds, debentures and notes (B)
 

 

 

Corporate fixed income and other securities
140.2

—

140.2

Mortgage-backed securities
12.3

—

12.3

Commingled fund (C)
24.4

—

24.4

Other
6.9

—

6.9

Foreign government bonds
5.6

—

5.6

U.S. municipal bonds
4.9

—

4.9

Interest-bearing cash
11.5

11.5

—

Money market fund
11.7

—

11.7

Preferred stocks (foreign)
0.3

0.3

—

Forward contracts
 
 
 
Receivable (foreign currency)
0.1

—

0.1

Payable (foreign currency)
(0.1
)
—

(0.1
)
Total Plan investments
$
587.0

$
378.8

$
208.2

Receivable from broker for securities sold
—

 

 

Interest and dividends receivable
3.5

 

 

Payable to broker for securities purchased
(8.8
)
 

 

Total Plan assets
$
581.7

 

 

(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
)
 

 

Total Plan assets
$
679.8

 

 

(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.
The following tables summarize the postretirement benefit plans investments that are measured at fair value on a recurring basis at December 31, 2015 and 2014.  There were no Level 2 investments held by the postretirement benefit plans at December 31, 2015 and 2014.
(In millions)
December 31, 2015
Level 1
Level 3
Group retiree medical insurance contract (A)
$
46.8

$
—

$
46.8

Mutual funds investment
 
 
 
U.S. equity investments
7.8

7.8

—

Money market funds investment
0.7

0.7

—

Total Plan investments
$
55.3

$
8.5

$
46.8

(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

(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.
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)
2015
Group retiree medical insurance contract
 
Beginning balance
$
51.0

Interest income
0.9

Dividend income
0.6

Realized losses
—

Administrative expenses and charges
(0.1
)
Net unrealized losses related to instruments held at the reporting date
(1.1
)
Claims paid
(4.5
)
Ending balance
$
46.8
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 the Company expects to pay related to its postretirement benefit plans, including prescription drug benefits.
 
 
 
(In millions)
Gross Projected
Postretirement
Benefit
Payments
2016
$
14.6

2017
14.6

2018
14.7

2019
14.7

2020
14.8

After 2020
72.4



 The following table summarizes the benefit payments the Company expects to pay related to OGE Energy's 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
2016
$
66.2

2017
50.6

2018
52.2

2019
54.7

2020
58.9

After 2020
275.7