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Retirement Plans and Postretirement Benefit Plans (Tables)
 9 Months Ended
Sep. 30, 2016
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]  
Schedule of Defined Benefit Plans Disclosures [Table Text Block]
The details of net periodic benefit cost, before consideration of capitalized amounts, of the Company's Pension Plan, the Restoration of Retirement Income Plan and the postretirement benefit plans included in the Condensed Consolidated Financial Statements are as follows:

Net Periodic Benefit Cost
 
Pension Plan
 
Restoration of Retirement
Income Plan
 
Three Months Ended
Nine Months Ended
 
Three Months Ended
Nine Months Ended
 
September 30,
September 30,
 
September 30,
September 30,
(In millions)
2016 (B)
2015 (B)
2016 (C)
2015 (C)
 
2016 (B)
2015 (B)
2016 (C)
2015 (C)
Service cost
$
4.0

$
4.2

$
11.9

$
12.1

 
$
—

$
0.4

$
0.2

$
1.0

Interest cost
6.4

6.6

19.1

19.6

 
0.1

0.2

0.3

0.5

Expected return on plan assets
(10.4
)
(11.0
)
(31.1
)
(34.5
)
 
—

—

—

—

Amortization of net loss
4.1

3.8

12.3

13.5

 
0.2

0.2

0.5

0.5

Amortization of unrecognized prior service cost (A)
(0.1
)
0.1

(0.1
)
0.3

 
0.1

—

0.1

0.1

Settlement
—

16.2

—

16.2

 
—

—

8.7

—

Total net periodic benefit cost
4.0

19.9

12.1

27.2


0.4

0.8

9.8

2.1

Less: Amount paid by unconsolidated affiliates
1.3

1.0

3.8

3.1

 
0.1

—

0.3

0.1

Net periodic benefit cost (net of unconsolidated affiliates)
$
2.7

$
18.9

$
8.3

$
24.1

 
$
0.3

$
0.8

$
9.5

$
2.0

(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 $3.0 million and $19.7 million of net periodic benefit cost recognized during the three months ended September 30, 2016 and 2015, respectively, OG&E recognized the following:

•
an increase in pension expense during the three months ended September 30, 2016 of $2.4 million and a deferral of $4.7 million for the three months ended September 30, 2015, 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
•
during the three months ended September 30, 2016 there were no costs relating to the deferral of pension expense compared to $1.4 million for the three months ended September 30, 2015 related to the Arkansas jurisdictional portion of the pension settlement charge of $16.2 million during the three months ended September 30, 2015.

(C)
In addition to the $17.8 million and $26.1 million of net periodic benefit cost recognized during the nine months ended September 30, 2016 and 2015, respectively, OG&E recognized the following:

•
an increase in pension expense during the nine months ended September 30, 2016 and 2015 of $6.7 million and $0.6 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
•
costs relating to the deferral of pension expense during the nine months ended September 30, 2016 and 2015 of $0.1 million and $1.4 million, respectively, related to the Arkansas jurisdictional portion of the pension settlement charge of $8.7 million and $16.2 million, respectively.
 
 
Postretirement Benefit Plans
 
Three Months Ended
Nine Months Ended
 
September 30,
September 30,
(In millions)
2016 (B)
2015 (B)
2016 (C)
2015 (C)
Service cost
$
0.2

$
0.4

$
0.6

$
1.2

Interest cost
2.4

2.6

7.1

7.7

Expected return on plan assets
(0.6
)
(0.6
)
(1.7
)
(1.8
)
Amortization of net loss
0.6

3.5

1.9

10.4

Amortization of unrecognized prior service cost (A)
(2.1
)
(4.1
)
(6.5
)
(12.4
)
Total net periodic benefit cost
0.5

1.8

1.4

5.1

Less: Amount paid by unconsolidated affiliates
—

0.4

0.1

1.0

Net periodic benefit cost (net of unconsolidated affiliates)
$
0.5

$
1.4

$
1.3

$
4.1

(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 $0.5 million and $1.4 million of net periodic benefit cost recognized during the three months ended September 30, 2016 and 2015, respectively, OG&E recognized an increase in postretirement medical expense during the three months ended September 30, 2016 and 2015 of $1.9 million and $1.4 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).
(C)
In addition to the $1.3 million and $4.1 million of net periodic benefit cost recognized during the nine months ended September 30, 2016 and 2015, respectively, OG&E recognized an increase in postretirement medical expense during the nine months ended September 30, 2016 and 2015 of $5.9 million and $4.3 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 Capitalized Pension and Postretirement Cost [Table Text Block]
 
Three Months Ended
Nine Months Ended
 
September 30,
September 30,
(In millions)
2016
2015
2016
2015
Capitalized portion of net periodic pension benefit cost
$
1.0

$
2.6

$
3.0

$
4.6

Capitalized portion of net periodic postretirement benefit cost
0.2

0.5

0.6

1.4