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BENEFIT PLANS: (Tables)
 6 Months Ended
Jun. 30, 2018
Post retirement defined benefit plans  
Components of net periodic benefit costs  
Schedule of the components of net periodic benefit costs

 

The components of net periodic benefit costs for the six months ended June 30, 2018 and 2017 are as follows (in millions):

 

 

 

2018

 

2017

 

Service cost

 

$
0.5

 

$
0.4

 

Interest cost

 
0.8

 
0.7

 

Expected return on plan assets

 
(1.8

)
(1.4

)

Amortization of prior service cost

 
0.1

 
0.1

 

Amortization of net loss

 
0.1

 
0.1

 

 

 

 

 

 

 

Net periodic benefit costs

 

$
(0.3

)

$
(0.1

)

 

 

 

 

 

 

 

 

 

(*) amount is lower than $0.1 million

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

 

The components of net periodic benefit cost for the six months ended June 30, 2018 and 2017 are as follows (in millions):

 

 

 

2018

 

2017

 

Interest cost

 

$
0.5

 

$
0.5

 

Amortization of net loss (gain)

 
(0.1

)
(0.1

)

Amortization of prior service cost (credit)

 

(*

)

(*

)

 

 

 

 

 

 

Net periodic benefit cost

 

$
0.4

 

$
0.4

 

 

 

 

 

 

 

 

 

 

 

(*) amount is lower than $0.1 million