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Retirement Plans and Postretirement Benefit Plans
9 Months Ended
Sep. 30, 2011
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract] 
Retirement Plans and Postretirement Benefit Plans
Retirement Plans and Postretirement Benefit Plans
 
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
 
Three Months Ended
 
Nine Months Ended
 
September 30,
 
September 30,
 (In millions)
2011 (A)
 
2010 (A)
 
2011 (B)
 
2010 (B)
Service cost
$
4.4

 
$
4.1

 
$
13.2

 
$
12.5

Interest cost
8.4

 
8.0

 
25.0

 
23.9

Expected return on plan assets
(11.4
)
 
(10.6
)
 
(34.1
)
 
(31.8
)
Amortization of net loss
4.8

 
5.3

 
14.4

 
15.9

Amortization of unrecognized prior service cost
0.6

 
0.6

 
1.8

 
1.8

Net periodic benefit cost
$
6.8

 
$
7.4

 
$
20.3

 
$
22.3

 
Restoration of Retirement Income Plan
 
Three Months Ended
 
Nine Months Ended
 
September 30,
 
September 30,
 (In millions)
2011 (A)
 
2010 (A)
 
2011 (B)
 
2010 (B)
Service cost
$
0.3

 
$
0.3

 
$
0.8

 
$
0.7

Interest cost
0.1

 
0.2

 
0.4

 
0.4

Amortization of net loss
0.1

 
—

 
0.3

 
0.2

Amortization of unrecognized prior service cost
0.1

 
0.1

 
0.5

 
0.5

Net periodic benefit cost
$
0.6

 
$
0.6

 
$
2.0

 
$
1.8

(A)
In addition to the $7.4 million and $8.0 million of net periodic benefit cost recognized during the three months ended September 30, 2011 and 2010, respectively, OG&E recognized an increase in pension expense during the three months ended September 30, 2011 and 2010 of $2.7 million and $2.3 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).
(B)
In addition to the $22.3 million and $24.1 million of net periodic benefit cost recognized during the nine months ended September 30, 2011 and 2010, respectively, OG&E recognized an increase in pension expense during the nine months ended September 30, 2011 and 2010 of $8.0 million and $5.8 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
 
Nine Months Ended
 
September 30,
 
September 30,
 (In millions)
2011 (C)
 
2010
 
2011 (C)
 
2010
Service cost
$
0.8

 
$
1.1

 
$
2.6

 
$
3.2

Interest cost
3.2

 
4.2

 
9.4

 
12.7

Expected return on plan assets
(1.2
)
 
(1.7
)
 
(3.8
)
 
(5.2
)
Amortization of transition obligation
0.7

 
0.7

 
2.1

 
2.1

Amortization of net loss
4.6

 
3.0

 
13.7

 
9.1

Amortization of unrecognized prior service cost
(4.2
)
 
—

 
(12.4
)
 
—

Net periodic benefit cost
$
3.9

 
$
7.3

 
$
11.6

 
$
21.9

(C) In addition to the $3.9 million and $11.6 million of net periodic benefit cost recognized during the three and nine months ended September 30, 2011, respectively, OG&E recognized an increase in postretirement medical expense during the three and nine months ended September 30, 2011 of $0.8 million and $2.5 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).

Pension Plan Funding
 
In the third quarter of 2011, the Company contributed $10 million to its Pension Plan for a total contribution of $50 million to its Pension Plan during 2011.  No additional contributions are expected in 2011.