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Components of Net Periodic Benefit Cost
 9 Months Ended
Sep. 30, 2013
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 2012 Annual Report on Form 10-K are expected to continue unchanged throughout 2013.
 
 
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
(in millions)
 
2013
 
2012
 
2013
 
2012
Service cost - benefits earned during the period
 
$
3.5

 
$
3.7

 
$
10.6

 
$
11.0

Interest cost on projected benefit obligation
 
8.1

 
8.4

 
24.3

 
25.4

Expected return on plan assets
 
(12.0
)
 
(10.9
)
 
(36.0
)
 
(32.7
)
Settlement loss
 
—

 
—

 
—

 
3.1

Curtailment loss
 
0.4

 
—

 
0.4

 
—

Amortization:
 
 
 
 
 
 
 
 
Unrecognized transition obligation
 
0.1

 
0.1

 
0.2

 
0.2

Prior service cost
 
0.2

 
0.3

 
0.8

 
1.1

Actuarial net loss
 
6.5

 
7.1

 
19.5

 
21.2

Net periodic benefit cost
 
$
6.8

 
$
8.7

 
$
19.8

 
$
29.3


 
Curtailment loss relates to September 2013 plan amendments that significantly reduced our benefit liability (See Note 10). Costs for defined contribution pension plans were $4.9 million and $14.2 million for the three and nine months ended September 30, 2013, respectively. 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.  Benefit costs for other postretirement plans were not significant during the periods presented.