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Benefit Plans
 9 Months Ended
Sep. 30, 2012
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]  
Benefit Plans
Benefit Plans

The components of net periodic benefit cost for the three months ended September 30 were as follows ($ in millions):

 
Pension benefits
 
Other retirement benefits
 
Total
 
2012
 
2011
 
2012
 
2011
 
2012
 
2011
Service cost
$
2.1

 
$
2.1

 
$
0.3

 
$
0.3

 
$
2.4

 
$
2.4

Interest cost
3.7

 
4.1

 
0.3

 
0.3

 
4.0

 
4.4

Expected return on assets
(4.0
)
 
(4.1
)
 
—

 
—

 
(4.0
)
 
(4.1
)
Amortization of prior service credit
(0.3
)
 
(0.3
)
 
—

 
—

 
(0.3
)
 
(0.3
)
Recognized actuarial losses
1.9

 
1.7

 
—

 
—

 
1.9

 
1.7

Curtailment gain, net
—

 
(0.2
)
 
—

 
—

 
—

 
(0.2
)
Net periodic benefit cost
$
3.4

 
$
3.3

 
$
0.6

 
$
0.6

 
$
4.0

 
$
3.9


 
Pension benefits
 
Other retirement benefits
 
Total
 
2012
 
2011
 
2012
 
2011
 
2012
 
2011
U.S. plans
$
2.7

 
$
2.4

 
$
0.6

 
$
0.6

 
$
3.3

 
$
3.0

International plans
0.7

 
0.9

 
—

 
—

 
0.7

 
0.9

Net periodic benefit cost
$
3.4

 
$
3.3

 
$
0.6

 
$
0.6

 
$
4.0

 
$
3.9


The components of net periodic benefit cost for the nine months ended September 30 were as follows ($ in millions):

 
Pension benefits
 
Other retirement benefits
 
Total
 
2012
 
2011
 
2012
 
2011
 
2012
 
2011
Service cost
$
6.7

 
$
7.0

 
$
1.0

 
$
0.9

 
$
7.7

 
$
7.9

Interest cost
11.4

 
12.1

 
0.7

 
0.7

 
12.1

 
12.8

Expected return on assets
(12.2
)
 
(12.1
)
 
—

 
—

 
(12.2
)
 
(12.1
)
Amortization of transition obligation
0.1

 
0.1

 
—

 
—

 
0.1

 
0.1

Amortization of prior service credit
(1.1
)
 
(1.2
)
 
0.1

 
0.1

 
(1.0
)
 
(1.1
)
Recognized actuarial losses
6.2

 
4.6

 
—

 
—

 
6.2

 
4.6

Curtailment gain, net
—

 
(0.2
)
 
—

 
—

 
—

 
(0.2
)
Net periodic benefit cost
$
11.1

 
$
10.3

 
$
1.8

 
$
1.7

 
$
12.9

 
$
12.0


 
Pension benefits
 
Other retirement benefits
 
Total
 
2012
 
2011
 
2012
 
2011
 
2012
 
2011
U.S. plans
$
9.1

 
$
7.9

 
$
1.8

 
$
1.7

 
$
10.9

 
$
9.6

International plans
2.0

 
2.4

 
—

 
—

 
2.0

 
2.4

Net periodic benefit cost
$
11.1

 
$
10.3

 
$
1.8

 
$
1.7

 
$
12.9

 
$
12.0



During the first quarter of 2012, we contributed $17.2 million to the U.S. qualified pension plan.

During the third quarter of 2011, as a result of the closure of a plant in the United States, we recorded a $0.2 million net curtailment gain in restructuring and other items related to our U.S. qualified and postretirement medical plans. Refer to Note 2, Restructuring and Other Items, for additional details regarding the 2010 plan.