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Components of Net Periodic Benefit Cost
 3 Months Ended
Mar. 31, 2017
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 and other postretirement plans are shown below.  The funding policy and assumptions disclosed in the Company’s 2016 Annual Report on Form 10-K are expected to continue unchanged throughout 2017.
 
 
Three Months Ended March 31,
 
 
Pension Benefits
 
Other Benefits
(in millions)
 
2017
 
2016
 
2017
 
2016
Service cost - benefits earned during the period
 
$
1.8

 
$
1.9

 
$
—

 
$
—

Interest cost on projected benefit obligation
 
7.6

 
8.2

 
—

 


Expected return on plan assets
 
(12.1
)
 
(12.9
)
 
—

 
—

Settlement loss
 
—

 
0.1

 
—

 
—

Amortization:
 
 
 
 
 
 
 
 
Prior service cost
 
0.2

 
0.2

 
—

 
—

Actuarial net loss (gain)
 
3.5

 
3.6

 
(0.2
)
 
(0.2
)
Net periodic benefit cost
 
$
1.0

 
$
1.1

 
$
(0.2
)
 
$
(0.2
)

 
Costs for defined contribution pension plans were $7.9 million and $7.7 million for the three months ended March 31, 2017 and 2016, respectively.