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EMPLOYEE BENEFIT PLANS (Tables)
 3 Months Ended
Mar. 31, 2018
Pension Plan  
Defined Benefit Plans and Other Postretirement Benefit Plans  
Schedule of Aggregated Net Periodic Benefit Cost and Other Benefit Cost
The following table sets forth the aggregated net periodic benefit cost for all pension plans for the first quarters ended March 31, 2018 and March 31, 2017:
(In millions)
Pension Benefits
 
Other Benefits
 
First Quarter Ended
 
First Quarter Ended
 
March 31, 2018
 
March 31, 2017
 
March 31, 2018
 
March 31, 2017
Service cost
$
0.2

 
$
0.1

 
$
—

 
$
—

Interest cost
1.3

 
1.4

 
0.1

 
0.1

Expected return on assets
(2.1
)
 
(2.2
)
 
—

 
—

Amortization of:
 
 
 
 
 
 
 
Prior service cost
—

 
—

 
—

 
0.1

Actuarial loss
0.7

 
0.6

 
0.1

 
—

Settlement cost
—

 
—

 
—

 
—

Net periodic benefit cost
$
0.1

 
$
(0.1
)
 
$
0.2

 
$
0.2