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BENEFIT PLANS: (Tables)
 6 Months Ended
Jun. 30, 2016
Post retirement defined benefit plans  
Components of net periodic benefit costs  
Schedule of the components of net periodic benefit costs

The components of the net periodic benefit costs for the six months ended June 30, 2016 and 2015 are as follows ($ in millions):

 

 

 

2016

 

2015

 

Service cost

 

$
0.4

 

$
0.5

 

Interest cost

 
0.5

 
0.5

 

Expected return on plan assets

 
(1.3

)
(1.6

)

Amortization of prior service cost (credit)

 
0.1

 
(0.2

)

Amortization of net loss

 
0.1

 
0.2

 

 

 

 

 

 

 

Net periodic benefit costs

 

$
(0.2

)

$
(0.6

)

 

 

 

 

 

 

 

 

 

Post-retirement Health care plans  
Components of net periodic benefit costs  
Schedule of the components of net periodic benefit costs

The components of the net periodic benefit cost for the six months ended June 30, 2016 and 2015 are as follows ($ in millions):

 

 

 

2016

 

2015

 

Interest cost

 

$
0.3

 

$
0.6

 

Amortization of net loss (gain)

 
(0.2

)
(0.1

)

Amortization of prior service cost (credit)

 

(*

)

(*

)

 

 

 

 

 

 

Net periodic benefit cost

 

$
0.1

 

$
0.5

 

 

 

 

 

 

 

 

 

 

(*) amount is lower than $0.1 million