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Retirement Plans and Postretirement Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2016
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 OGE Energy's Pension Plan, the Restoration of Retirement Income Plan and the postretirement benefit plans for 2016 and 2015. These amounts have been recorded in Accrued Benefit Obligations with the offset recorded as a regulatory asset in OG&E's Balance Sheets 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, 2016 was $458.1 million and $3.4 million, respectively. The accumulated postretirement benefit obligation for the Pension Plan and the Restoration of Retirement Income Plan at December 31, 2015 was $470.6 million and $2.2 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)
2016
2015
2016
2015
2016
2015
Change in Benefit Obligation
 
 
 
 
 
 
Beginning obligations
$
514.4

$
543.5

$
2.7

$
2.8

$
176.1

$
217.6

Service cost
10.3

10.3

0.1

0.1

0.6

1.0

Interest cost
19.2

19.8

0.1

0.1

7.4

7.9

Plan settlements
—

(36.5
)
(1.0
)
—

—

—

Participants' contributions
—

—

—

—

2.9

2.6

Actuarial (gains) losses
1.2

(8.6
)
2.1

(0.1
)
(7.2
)
(40.0
)
Benefits paid
(44.6
)
(14.1
)
—

(0.2
)
(13.4
)
(13.0
)
Ending obligations
$
500.5

$
514.4

$
4.0

$
2.7

$
166.4

$
176.1

 
 
 
 
 
 
 
Change in Plans' Assets
 
 
 
 
 
 
Beginning fair value
$
464.2

$
532.5

$
—

$
—

$
50.0

$
54.2

Actual return on plans' assets
37.7

(17.7
)
—

—

1.8

(0.5
)
Employer contributions
—

—

1.0

0.2

6.5

6.7

Plan settlements
—

(36.5
)
(1.0
)
—

—

—

Participants' contributions
—

—

—

—

2.9

2.6

Benefits paid
(44.6
)
(14.1
)
—

(0.2
)
(13.4
)
(13.0
)
Ending fair value
$
457.3

$
464.2

$
—

$
—

$
47.8

$
50.0

Funded status at end of year
$
(43.2
)
$
(50.2
)
$
(4.0
)
$
(2.7
)
$
(118.6
)
$
(126.1
)
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)
2016
2015
2014
2016
2015
2014
2016
2015
2014
Service cost
$
10.3

$
10.3

$
9.1

$
0.1

$
0.1

$
—

$
0.6

$
1.0

$
2.0

Interest cost
19.2

19.8

21.4

0.1

0.1

0.1

7.4

7.9

8.8

Expected return on plan assets
(33.1
)
(36.5
)
(35.8
)
—

—

—

(2.1
)
(2.2
)
(2.2
)
Amortization of net loss
12.4

13.8

11.4

0.1

0.1

0.1

2.5

11.9

11.0

Amortization of unrecognized prior service cost (A)
—

0.5

1.9

—

—

0.1

(6.1
)
(13.6
)
(13.7
)
Settlement
—

14.2

—

0.4

—

—

—

—

—

Net periodic benefit cost (B)
$
8.8

$
22.1

$
8.0

$
0.7

$
0.3

$
0.3

$
2.3

$
5.0

$
5.9

(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 $11.8 million, $27.4 million and $14.2 million of net periodic benefit cost recognized in 2016, 2015 and 2014, respectively, OG&E recognized the following:
 
•
a change in pension expense in 2016, 2015 and 2014 of $9.9 million, $(3.1) million and $11.2 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 2016, 2015 and 2014 of $7.9 million, $5.8 million and $5.2 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 2016 and 2015 of $0.1 million and $1.9 million related to the Arkansas jurisdictional portion of the pension settlement charge of $0.4 million and $14.2 million, respectively.
Schedule of Capitalized Pension and Postretirement Cost [Table Text Block]
(In millions)
2016
2015
2014
Capitalized portion of net periodic pension benefit cost
$
2.9

$
2.6

$
2.6

Capitalized portion of net periodic postretirement benefit cost
0.8

1.6

1.8
Schedule of Assumptions Used [Table Text Block]
Rate Assumptions
 
Pension Plan and
Restoration of Retirement Income Plan
Postretirement
Benefit Plans
Year ended December 31
2016
2015
2014
2016
2015
2014
Discount rate
4.00
%
4.00
%
3.80
%
4.20
%
4.25
%
3.80
%
Rate of return on plans' assets
7.50
%
7.50
%
7.50
%
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

6.75
%
6.10
%
7.85
%
Ultimate trend rate
N/A

N/A

N/A

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

N/A

N/A

2026

2026

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)
2016
2015
2014
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)
2016
2015
2014
Effect on aggregate of the service and interest cost components
$
—

$
—

$
—

Effect on accumulated postretirement benefit obligations
0.5

0.5

0.5
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 Large Cap Equity                                        
40%
35%
60%
Domestic Mid-Cap Equity                                           
15%
5%
25%
Domestic Small-Cap Equity
25%
5%
30%
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, 2016 and 2015.  There were no Level 2 investments held by the postretirement benefit plans at December 31, 2016 and 2015.
(In millions)
December 31, 2016
Level 1
Level 3
Group retiree medical insurance contract (A)
$
44.7

$
—

$
44.7

Mutual funds investment
 
 
 
U.S. equity investments
8.1

8.1

—

Cash
0.3

0.3

—

Total Plan investments
$
53.1

$
8.4

$
44.7

Plan investments attributable to affiliates
(5.3
)
 
 
Total Plan assets
$
47.8





(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

Plan investments attributable to affiliates
(5.3
)
 
 
Total Plan assets
$
50.0





(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.
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, 2016 and 2015.  There were no Level 3 investments held by the Pension Plan at December 31, 2016 and 2015. 
(In millions)
December 31, 2016
Level 1
Level 2
NAV
Common stocks
$
237.1

$
237.1

$
—

$
—

U.S. treasury notes and bonds (A)
122.3

122.3

—

—

Mortgage and asset-backed securities
59.2

—

59.2

—

Corporate fixed income and other securities
137.6

—

137.6

—

Commingled fund (B)
23.8

—

—

23.8

Foreign government bonds
5.2

—

5.2

—

U.S. municipal bonds
1.9

—

1.9

—

Money market fund
2.2

—

—

2.2

Mutual fund
9.0

9.0

—

—

Futures
 
 
 
 
U.S. Treasury futures (receivable)
10.7

—

10.7

—

U.S. Treasury futures (payable)
(2.3
)
—

(2.3
)
—

Cash collateral
0.3

0.3

—

—

Forward contracts
 
 
 
 
Receivable (foreign currency)
0.2

—

0.2

—

Total Plan investments
$
607.2

$
368.7

$
212.5

$
26.0

Receivable from broker for securities sold
—

 

 

 
Interest and dividends receivable
3.0

 

 

 
Payable to broker for securities purchased
(14.3
)
 

 

 
Plan investments attributable to affiliates
(138.6
)
 
 
 
Total Plan assets
$
457.3

 

 

 
(In millions)
December 31, 2015
Level 1
Level 2
NAV
Common stocks
$
208.2

$
208.2

$
—

$
—

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

158.9

—

—

Mortgage-backed securities
14.5

—

14.5

—

Corporate fixed income and other securities
140.2

—

140.2

—

Commingled fund (B)
24.4

—

—

24.4

Foreign government bonds
5.6

—

5.6

—

U.S. municipal bonds
4.9

—

4.9

—

Interest-bearing cash
0.4

0.4

—

—

Money market fund
11.7

—

—

11.7

Index fund
1.8

1.8

—

—

Mutual fund
24.3

24.3

—

—

Preferred stocks
0.3

0.3

—

—

Futures
 
 
 
 
U.S. Treasury futures (receivable)
17.6

—

17.6

—

U.S. Treasury futures (payable)
(12.4
)
—

(12.4
)
—

Forward contracts
 
 
 
 
Receivable (foreign currency)
0.1

—

0.1

—

Payable (foreign currency)
(0.1
)
—

(0.1
)
—

Total Plan investments
$
600.4

$
393.9

$
170.4

$
36.1

Receivable from broker for securities sold
—

 

 

 
Interest and dividends receivable
3.5

 

 

 
Payable to broker for securities purchased
(22.2
)
 

 

 
Plan investments attributable to affiliates
(117.5
)
 
 
 
Total Plan assets
$
464.2

 
 

 

(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 represents units of participation in a commingled fund that primarily invested in stocks of international companies and emerging markets.
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)
2016
Group retiree medical insurance contract
 
Beginning balance
$
46.8

Interest income
0.9

Dividend income
0.6

Net unrealized gains related to instruments held at the reporting date
0.2

Realized losses
(0.1
)
Claims paid
(3.7
)
Ending balance
$
44.7
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
2017
$
11.4

2018
11.4

2019
11.3

2020
11.3

2021
11.2

After 2021
53.8



The following table summarizes the benefit payments OG&E 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 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
2017
$
35.3

2018
37.0

2019
40.3

2020
42.3

2021
42.7

After 2021
210.0