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Retirement Plans and Postretirement Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2018
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 2018 and 2017. 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, 2018 was $561.9 million and $7.8 million, respectively. The accumulated postretirement benefit obligation for the Pension Plan and the Restoration of Retirement Income Plan at December 31, 2017 was $626.9 million and $7.5 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 included in the following table.
 
Pension Plan
Restoration of Retirement
Income Plan
Postretirement
Benefit Plans
 December 31 (In millions)
2018
2017
2018
2017
2018
2017
Change in benefit obligation
 
 
 
 
 
 
Beginning obligations
$
687.5

$
672.2

$
8.1

$
7.0

$
149.4

$
215.9

Service cost
14.9

15.5

0.4

0.3

0.3

0.6

Interest cost
23.8

26.2

0.3

0.3

5.4

7.2

Plan settlements
(73.7
)
(50.2
)
(2.0
)
—

—

(28.1
)
Plan amendments
—

—

—

—

—

(39.6
)
Participants' contributions
—

—

—

—

3.8

3.5

Actuarial losses (gains)
(22.0
)
38.6

2.8

0.7

(9.6
)
5.6

Benefits paid
(14.6
)
(14.8
)
—

(0.2
)
(13.5
)
(15.7
)
Ending obligations
$
615.9

$
687.5

$
9.6

$
8.1

$
135.8

$
149.4

 
 
 
 
 
 
 
Change in plans' assets
 
 
 
 
 
 
Beginning fair value
$
635.3

$
595.9

$
—

$
—

$
50.2

$
53.1

Actual return on plans' assets
(39.2
)
84.4

—

—

(0.6
)
2.8

Employer contributions
15.0

20.0

2.0

0.2

5.4

34.6

Plan settlements
(73.7
)
(50.2
)
(2.0
)
—

—

(28.1
)
Participants' contributions
—

—

—

—

3.8

3.5

Benefits paid
(14.6
)
(14.8
)
—

(0.2
)
(13.5
)
(15.7
)
Ending fair value
$
522.8

$
635.3

$
—

$
—

$
45.3

$
50.2

Funded status at end of year
$
(93.1
)
$
(52.2
)
$
(9.6
)
$
(8.1
)
$
(90.5
)
$
(99.2
)
Schedule of Defined Benefit Plans Disclosures [Table Text Block]
The following table presents the net periodic benefit cost components, before consideration of capitalized amounts, of the Company's Pension Plan, Restoration of Retirement Income Plan and postretirement benefit plans that are included in the Consolidated Financial Statements. Service cost is presented within Other Operation and Maintenance, and interest cost, expected return on plan assets, amortization of net loss, amortization of unrecognized prior service cost and settlement cost are presented within Other Net Periodic Benefit Expense in the Company's Consolidated Statements of Income. OG&E recovers specific amounts of pension and postretirement medical costs in rates approved in its Oklahoma rate reviews. In accordance with approved orders, OG&E defers the difference between actual pension and postretirement medical expenses and the amount approved in its last Oklahoma rate review as a regulatory asset or regulatory liability. These amounts have been recorded in the Pension tracker in the regulatory assets and liabilities table in Note 1 and within Other Net Periodic Benefit Expense in the Company's Consolidated Statements of Income.
 
Pension Plan
Restoration of Retirement
Income Plan
Postretirement Benefit Plans
Year Ended December 31 (In millions)
2018
2017
2016
2018
2017
2016
2018
2017
2016
Service cost
$
14.9

$
15.5

$
15.8

$
0.4

$
0.3

$
0.3

$
0.3

$
0.6

$
0.8

Interest cost
23.8

26.2

25.5

0.3

0.3

0.4

5.4

7.2

9.5

Expected return on plan assets
(44.1
)
(42.6
)
(41.5
)
—

—

—

(2.0
)
(2.2
)
(2.3
)
Amortization of net loss
16.2

17.4

16.5

0.7

0.4

0.7

3.8

2.0

2.6

Amortization of unrecognized prior service cost (A)
—

(0.1
)
(0.1
)
0.1

0.1

0.1

(8.4
)
(3.5
)
(8.8
)
Settlement cost
25.1

15.3

—

1.0

—

8.6

—

0.6

—

Total net periodic benefit cost
35.9

31.7

16.2

2.5

1.1

10.1

(0.9
)
4.7

1.8

Less: Amount paid by unconsolidated affiliates
2.5

4.3

5.1

0.1

—

0.3

(0.5
)
0.3

0.2

Net periodic benefit cost (B)
$
33.4

$
27.4

$
11.1

$
2.4

$
1.1

$
9.8

$
(0.4
)
$
4.4

$
1.6

(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 $35.4 million, $32.9 million and $22.5 million of net periodic benefit cost recognized in 2018, 2017 and 2016, respectively, OG&E recognized the following:

•
a change in pension expense in 2018, 2017 and 2016 of $(14.1) million, $(2.3) million and $9.9 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 2018, 2017 and 2016 of $4.4 million, $6.2 million and $7.9 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 2018, 2017 and 2016 of $2.1 million, $1.1 million and $0.1 million related to the Arkansas jurisdictional portion of the pension settlement charge of $26.1 million, $15.3 million and $8.6 million, respectively, which are included in the Arkansas deferred pension expense regulatory asset (see Note 1).
Schedule of Capitalized Pension and Postretirement Cost [Table Text Block]
(In millions)
2018
2017
2016
Capitalized portion of net periodic pension benefit cost
$
3.8

$
4.4

$
4.0

Capitalized portion of net periodic postretirement benefit cost
$
0.2

$
1.2

$
0.8
Schedule of Assumptions Used [Table Text Block]
Rate Assumptions
 
Pension Plan and
Restoration of Retirement Income Plan
Postretirement
Benefit Plans
Year Ended December 31
2018
2017
2016
2018
2017
2016
Assumptions to determine benefit obligations:












Discount rate
4.20
%
3.60
%
4.00
%
4.30
%
3.70
%
4.20
%
Rate of compensation increase
4.20
%
4.20
%
4.20
%
N/A

N/A

4.20
%
Assumptions to determine net periodic benefit cost:
 
 
 
 
 
 
Discount rate
3.73
%
4.00
%
4.00
%
3.70
%
4.20
%
4.25
%
Expected return on plan assets
7.50
%
7.50
%
7.50
%
4.00
%
4.00
%
4.00
%
Rate of compensation increase
4.20
%
4.20
%
4.20
%
N/A

4.20
%
4.20
%
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)
2018
2017
2016
Effect on aggregate of the service and interest cost components
$
—

$
—

$
—

Effect on accumulated postretirement benefit obligations
$
0.1

$
0.1

$
0.2

ONE-PERCENTAGE POINT DECREASE
Year Ended December 31 (In millions)
2018
2017
2016
Effect on aggregate of the service and interest cost components
$
—

$
—

$
—

Effect on accumulated postretirement benefit obligations
$
0.3

$
0.3

$
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 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 the Pension Plan's investments that are measured at fair value on a recurring basis at December 31, 2018 and 2017. There were no Level 3 investments held by the Pension Plan at December 31, 2018 and 2017. 
(In millions)
December 31, 2018
Level 1
Level 2
Net Asset Value (A)
Common stocks
$
169.3

$
169.3

$
—

$
—

U.S. Treasury notes and bonds (B)
137.9

137.9

—

—

Mortgage- and asset-backed securities
65.9

—

65.9

—

Corporate fixed income and other securities
143.2

—

143.2

—

Commingled fund (C)
19.7

—

—

19.7

Foreign government bonds
4.4

—

4.4

—

U.S. municipal bonds
0.6

—

0.6

—

Money market fund
0.3

—

—

0.3

Mutual fund
8.0

8.0

—

—

Futures:
 


 
 
U.S. Treasury futures (receivable)
27.0

—

27.0

—

U.S. Treasury futures (payable)
(20.4
)
—

(20.4
)
—

Cash collateral
0.7

0.7

—

—

Forward contracts:
 
 
 
 
Receivable (foreign currency)
0.1

—

0.1

—

Total Pension Plan investments
$
556.7

$
315.9

$
220.8

$
20.0

Receivable from broker for securities sold
—

 

 

 
Interest and dividends receivable
3.0

 

 

 
Payable to broker for securities purchased
(36.9
)
 

 

 
Total Pension Plan assets
$
522.8

 

 

 
(A)
GAAP allows the measurement of certain investments that do not have a readily determinable fair value at the net asset value. These investments do not consider the observability of inputs; therefore, they are not included within the fair value hierarchy.
(B)
This category represents U.S. Treasury notes and bonds with a Moody's Investors Service rating of Aaa and Government Agency Bonds with a Moody's Investors Service rating of A1 or higher.
(C)
This category represents units of participation in a commingled fund that primarily invested in stocks of international companies and emerging markets.

(In millions)
December 31, 2017
Level 1
Level 2
Net Asset Value (A)
Common stocks
$
225.9

$
225.9

$
—

$
—

U.S. Treasury notes and bonds (B)
169.7

169.7

—

—

Mortgage- and asset-backed securities
43.4

—

43.4

—

Corporate fixed income and other securities
153.8

—

153.8

—

Commingled fund (C)
29.9

—

—

29.9

Foreign government bonds
4.0

—

4.0

—

U.S. municipal bonds
1.2

—

1.2

—

Money market fund
4.3

—

—

4.3

Mutual fund
7.8

7.8

—

—

Futures:
 
 
 
 
U.S. Treasury futures (receivable)
13.4

—

13.4

—

U.S. Treasury futures (payable)
(11.4
)
—

(11.4
)
—

Cash collateral
0.3

0.3

—

—

Forward contracts:
 
 
 
 
Receivable (foreign currency)
0.1

—

0.1

—

Total Pension Plan investments
$
642.4

$
403.7

$
204.5

$
34.2

Receivable from broker for securities sold
—

 

 

 
Interest and dividends receivable
3.2

 

 

 
Payable to broker for securities purchased
(10.3
)
 

 

 
Total Pension Plan assets
$
635.3

 

 

 
(A)
GAAP allows the measurement of certain investments that do not have a readily determinable fair value at the net asset value. These investments do not consider the observability of inputs; therefore, they are not included within the fair value hierarchy.
(B)
This category represents U.S. Treasury notes and bonds with a Moody's Investors Service rating of Aaa and Government Agency Bonds with a Moody's Investors Service rating of A1 or higher.
(C)
This category represents units of participation in a commingled fund that primarily invested in stocks of international companies and emerging markets.
The following tables summarize the postretirement benefit plans' investments that are measured at fair value on a recurring basis at December 31, 2018 and 2017. There were no Level 2 investments held by the postretirement benefit plans at December 31, 2018 and 2017.
(In millions)
December 31, 2018
Level 1
Level 3
Group retiree medical insurance contract
$
36.0

$
—

$
36.0

Mutual funds
8.9

8.9

—

Cash
0.9

0.9

—

Total plan investments
$
45.8

$
9.8

$
36.0

(In millions)
December 31, 2017
Level 1
Level 3
Group retiree medical insurance contract
$
40.2

$
—

$
40.2

Mutual funds
9.5

9.5

—

Cash
0.5

0.5

—

Total plan investments
$
50.2

$
10.0

$
40.2
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)
2018
Group retiree medical insurance contract:
 
Beginning balance
$
40.2

Interest income
0.7

Dividend income
0.5

Claims paid
(4.6
)
Net unrealized losses related to instruments held at the reporting date
(0.5
)
Realized losses
(0.2
)
Investment fees
(0.1
)
Ending balance
$
36.0
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 the Company expects to pay related to its postretirement benefit plans, including prescription drug benefits.
 
 
 
(In millions)
Gross Projected
Postretirement
Benefit
Payments
2019
$
11.6

2020
$
11.6

2021
$
11.6

2022
$
11.6

2023
$
10.2

After 2023
$
46.7



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
2019
$
64.3

2020
$
60.2

2021
$
60.6

2022
$
59.7

2023
$
59.7

After 2023
$
267.6