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Retirement Plans and Postretirement Benefit Plans (Tables)
 3 Months Ended
Mar. 31, 2016
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]  
Schedule of Defined Benefit Plans Disclosures [Table Text Block]
Net Periodic Benefit Cost
 
Pension Plan
Restoration of Retirement
Income Plan
Postretirement Benefit Plans
 
Three Months Ended March 31,
Three Months Ended March 31,
Three Months Ended March 31,
(In millions)
2016
2015
2016
2015
2016
2015
Service cost
$
2.8

$
2.7

$
—

$
—

$
0.1

$
0.3

Interest cost
5.0

4.8

0.1

0.1

1.8

2.0

Expected return on plan assets
(8.4
)
(9.3
)
—

—

(0.5
)
(0.5
)
Amortization of net loss
3.2

3.2

—

—

0.5

2.9

Amortization of unrecognized prior service cost (A)
—

0.1

—

—

(1.5
)
(3.4
)
Net periodic benefit cost (B)
$
2.6

$
1.5

$
0.1

$
0.1

$
0.4

$
1.3

(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 $3.1 million and $2.9 million of net periodic benefit cost recognized during the three months ended March 31, 2016 and 2015, respectively, OG&E recognized the following:
 
•
an increase in pension expense in the three months ended March 31, 2016 and 2015 of $2.3 million and $3.0 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
•
an increase in postretirement medical expense in the three months ended March 31, 2016 and 2015 of $2.0 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).
 
Three Months Ended March 31,
(In millions)
2016
2015
Capitalized portion of net periodic pension benefit cost
$
0.9

$
0.5

Capitalized portion of net periodic postretirement benefit cost
0.2

0.4
Schedule of Capitalized Pension and Postretirement Cost [Table Text Block]