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BENEFIT PLANS: (Tables)
 6 Months Ended
Jun. 30, 2013
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, 2013 and 2012 are as follows (in millions):

 

 

 

2013

 

2012

 

Service cost

 

$

0.7

 

$

0.5

 

Interest cost

 

0.5

 

0.6

 

Expected return on plan assets

 

(1.8

)

(1.8

)

Amortization of net actuarial loss

 

(0.4

)

(0.4

)

Amortization of net loss (gain)

 

0.1

 

0.1

 

Net periodic benefit costs

 

$

(0.9

)

$

(1.0

)
Post-retirement health care plan
  
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, 2013 and 2012 are as follows (in millions):

 

 

 

2013

 

2012

 

 

 

 

 

 

 

Interest cost

 

$

0.8

 

$

0.7

 

Amortization of net loss (gain)

 

(*

)

(0.2

)

Amortization of prior service cost (credit)

 

(*

)

(*

)

Net periodic benefit cost

 

$

0.8

 

$

0.5

 

 

 

(*) amount is lower than $0.1 million