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Retirement Plans and Postretirement Benefit Plans (Tables)
 3 Months Ended
Mar. 31, 2013
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 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
 
Three Months
Ended
 
March 31,
 
March 31,
(In millions)
2013 (B)
2012 (B)
 
2013 (B)
2012 (B)
Service cost
$
5.0

$
4.5

 
$
0.3

$
0.3

Interest cost
6.6

7.5

 
0.1

0.1

Expected return on plan assets
(12.3
)
(11.5
)
 
—

—

Amortization of net loss
6.2

5.9

 
0.1

0.1

Amortization of unrecognized prior service cost (A)
0.5

0.6

 
0.1

0.2

Net periodic benefit cost
$
6.0

$
7.0

 
$
0.6

$
0.7

(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 $6.6 million and $7.7 million of net periodic benefit cost recognized during the three months ended March 31, 2013 and 2012, respectively, OG&E recognized an increase in pension expense during the three months ended March 31, 2013 and 2012 of $1.9 million and $2.9 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 liability (see Note 1).  
  
 
Postretirement Benefit Plans
 
Three Months
Ended
 
March 31,
(In millions)
2013 (B)
2012 (B)
Service cost
$
1.2

$
1.0

Interest cost
2.6

3.0

Expected return on plan assets
(0.6
)
(0.8
)
Amortization of transition obligation
—

0.7

Amortization of net loss
5.3

5.1

Amortization of unrecognized prior service cost (A)
(4.1
)
(4.1
)
Net periodic benefit cost
$
4.4

$
4.9

(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 $4.4 million and $4.9 million of net periodic benefit cost recognized during the three months ended March 31, 2013 and 2012, respectively, OG&E recognized an increase in postretirement medical expense during the three months ended March 31, 2013 and 2012 of $0.1 million and $0.4 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).