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Components of Net Periodic Benefit Cost
 6 Months Ended
Jun. 30, 2014
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 2013 Annual Report on Form 10-K are expected to continue unchanged throughout 2014.
 
 
Three Months Ended June 30,
 
Six Months Ended June 30,
(in millions)
 
2014
 
2013
 
2014
 
2013
Service cost - benefits earned during the period
 
$
2.0

 
$
3.6

 
$
3.9

 
$
7.1

Interest cost on projected benefit obligation
 
8.4

 
8.1

 
17.0

 
16.2

Expected return on plan assets
 
(12.0
)
 
(12.0
)
 
(24.0
)
 
(24.0
)
Settlement loss
 
—

 
—

 
0.4

 
—

Curtailment loss
 
—

 
—

 
0.9

 
—

Amortization:
 
 
 
 
 
 
 
 
Unrecognized transition obligation
 
—

 
—

 
0.1

 
0.1

Prior service cost
 
0.3

 
0.2

 
0.7

 
0.6

Actuarial net loss
 
3.0

 
6.4

 
5.8

 
13.0

Net periodic benefit cost
 
$
1.7

 
$
6.3

 
$
4.8

 
$
13.0


 
Costs for defined contribution pension plans were $5.1 million and $10.5 million for the three and six months ended June 30, 2014, respectively. Costs for defined contribution pension plans were $4.3 million and $9.3 million for the three and six months ended June 30, 2013, respectively. For the six months ended June 30, 2014, a curtailment benefit of $3.0 million was recorded related to other postretirement plan changes. Benefit costs for other postretirement plans were not significant for the six months ended June 30, 2013.