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EMPLOYEE BENEFIT PLANS (Tables)
 6 Months Ended
Jun. 30, 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 second quarters and six months ended June 30, 2018 and June 30, 2017:
(In millions)
Pension Benefits
 
Second Quarter Ended
 
Six Months Ended
 
June 30, 2018
 
June 30, 2017
 
June 30, 2018
 
June 30, 2017
Service cost
$
0.2

 
$
0.2

 
$
0.4

 
$
0.3

Interest cost
1.4

 
1.5

 
2.7

 
2.9

Expected return on assets
(2.2
)
 
(2.3
)
 
(4.3
)
 
(4.5
)
Amortization of:
 
 
 
 
 
 
 
Prior service cost
—

 
—

 
—

 
—

Actuarial loss
0.8

 
0.7

 
1.5

 
1.3

Settlement cost
—

 
—

 
—

 
—

Net periodic benefit cost
$
0.2

 
$
0.1

 
$
0.3

 
$
—

 
 
 
 
 
 
 
 
Other Benefits  
Defined Benefit Plans and Other Postretirement Benefit Plans  
Schedule of Aggregated Net Periodic Benefit Cost and Other Benefit Cost The following table sets fort the aggregated net periodic benefit cost for the post-retirement benefit plan for the second quarters and six months ended June 30, 2018 and June 30, 2017.

(In millions)
Other Benefits
 
Second Quarter Ended
 
Six Months Ended
 
June 30, 2018
 
June 30, 2017
 
June 30, 2018
 
June 30, 2017
Service cost
$
—

 
$
—

 
$
—

 
$
—

Interest cost
0.1

 
0.1

 
0.2

 
0.2

Expected return on assets
—

 
—

 
—

 
—

Amortization of:
 
 
 
 
 
 
 
Prior service cost
—

 
0.1

 
—

 
0.2

Actuarial loss
—

 
—

 
0.1

 
—

Settlement cost
—

 
—

 
—

 
—

Net periodic benefit cost
$
0.1

 
$
0.2

 
$
0.3

 
$
0.4