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Components of Net Periodic Benefit Cost
 9 Months Ended
Sep. 30, 2012
General Discussion of Pension and Other Postretirement Benefits [Abstract]  
Components of Net Periodic Benefit Cost
Components of Net Periodic Benefit Cost
 
Benefit costs for defined benefit pension plans are shown below.  The funding policy and assumptions disclosed in the Company’s 2011 Annual Report on Form 10-K are expected to continue unchanged throughout 2012.
 
 
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
(in millions)
 
2012
 
2011
 
2012
 
2011
Service cost — benefits earned during the period
 
$
3.7

 
$
3.3

 
$
11.0

 
$
10.1

Interest cost on projected benefit obligation
 
8.4

 
8.8

 
25.4

 
26.5

Expected return on plan assets
 
(10.9
)
 
(10.1
)
 
(32.7
)
 
(30.3
)
Amortization of unrecognized transition obligation
 
0.1

 
0.1

 
0.2

 
0.2

Amortization of prior service cost
 
0.3

 
0.5

 
1.1

 
1.6

Recognized actuarial net loss
 
7.1

 
5.9

 
21.2

 
17.6

Settlement loss (gain)
 
—

 
—

 
3.1

 
(2.5
)
Net periodic benefit cost
 
$
8.7

 
$
8.5

 
$
29.3

 
$
23.2


 
Costs for defined contribution pension plans were $5.3 million and $16.1 million for the three and nine months ended September 30, 2012, respectively, and were $9.8 million for the nine months ended September 30, 2011.  A reduction in defined contribution pension plans accruals created a benefit of $0.1 million for the three months ended September 30, 2011. Benefit costs for other post retirement plans were not significant during the periods presented.