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Components of Net Periodic Benefit Cost
 3 Months Ended
Mar. 31, 2018
Retirement Benefits, Description [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 2017 Annual Report on Form 10-K are expected to continue unchanged throughout 2018.
 
 
Three Months Ended March 31,
 
 
Pension Benefits
 
Other Benefits
(in millions)
 
2018
 
2017
 
2018
 
2017
Service cost - benefits earned during the period
 
$
1.9

 
$
1.8

 
$
—

 
$
—

Interest cost on projected benefit obligation
 
6.7

 
7.6

 
—

 
—

Expected return on plan assets
 
(10.8
)
 
(12.1
)
 
—

 
—

Amortization:
 
 
 
 
 
 
 
 
Prior service cost
 
0.2

 
0.2

 
—

 
—

Actuarial net loss (gain)
 
4.2

 
3.5

 
(0.3
)
 
(0.2
)
Net periodic benefit cost
 
$
2.2

 
$
1.0

 
$
(0.3
)
 
$
(0.2
)

 
Service cost is recorded in cost of products sold and selling, general, and administrative expenses in the income statement. All other components are recorded within other non-operating income.

Costs for defined contribution pension plans were $7.1 million and $7.9 million for the three months ended March 31, 2018 and 2017, respectively.