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EMPLOYEE BENEFIT PLANS (Tables)
 9 Months Ended
Sep. 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 third quarters and nine months ended September 30, 2018 and September 30, 2017:
(In millions)
Pension Benefits
 
Third Quarter Ended
 
Nine Months Ended
 
September 30, 2018
 
September 30, 2017
 
September 30, 2018
 
September 30, 2017
Service cost
$
0.2

 
$
0.2

 
$
0.6

 
$
0.5

Interest cost
1.4

 
1.4

 
4.1

 
4.3

Expected return on assets
(2.1
)
 
(2.2
)
 
(6.4
)
 
(6.7
)
Amortization of:
 
 
 
 
 
 
 
Prior service cost
—

 
—

 
—

 
—

Actuarial loss
0.7

 
0.7

 
2.2

 
2.0

Settlement cost
—

 
—

 
—

 
—

Net periodic benefit cost
$
0.2

 
$
0.1

 
$
0.5

 
$
0.1

 
 
 
 
 
 
 
 
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 forth the aggregated net periodic benefit cost for the other post-retirement benefit plan for the third quarters and nine months ended September 30, 2018 and September 30, 2017.

(In millions)
Other Benefits
 
Third Quarter Ended
 
Nine Months Ended
 
September 30, 2018
 
September 30, 2017
 
September 30, 2018
 
September 30, 2017
Service cost
$
—

 
$
—

 
$
—

 
$
—

Interest cost
0.1

 
—

 
0.3

 
0.2

Expected return on assets
—

 
—

 
—

 
—

Amortization of:
 
 
 
 
 
 
 
Prior service cost
—

 
0.1

 
—

 
0.3

Actuarial loss
—

 
—

 
0.1

 
—

Settlement cost
—

 
—

 
—

 
—

Net periodic benefit cost
$
0.1

 
$
0.1

 
$
0.4

 
$
0.5